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114-397: In addition to industrial applications such in as varnishes, adhesives, and sealing wax, it is crucial for musicians who play bowed string instruments to enhance bow grip, and it provides grip in various sports and activities. Rosin also serves as an ingredient in medicinal and pharmaceutical formulations and can cause contact dermatitis or occupational asthma in sensitive individuals. It

228-505: A specialist , or watchful observation. A follow-up may be advised. Depending upon the health insurance plan and the managed care system, various forms of " utilization review ", such as prior authorization of tests, may place barriers on accessing expensive services. The medical decision-making (MDM) process includes the analysis and synthesis of all the above data to come up with a list of possible diagnoses (the differential diagnoses), along with an idea of what needs to be done to obtain

342-413: A "normal" plucking point, producing a canonical harpsichord sound; the other has a plucking point close to the bridge, producing a reedier "nasal" sound rich in upper harmonics. A single string at a certain tension and length only produces one note. To produce multiple notes, string instruments use one of two methods. One is to add enough strings to cover the required range of different notes (e.g., as with

456-459: A causative agent of occupational asthma . The symptoms also include desquamation of bronchial epithelium . String instrument Plucked In musical instrument classification , string instruments , or chordophones , are musical instruments that produce sound from vibrating strings when a performer strums, plucks, strikes or sounds the strings in varying manners. Musicians play some string instruments, like guitars , by plucking

570-550: A cave painting in the Trois Frères cave in France depicts what some believe is a musical bow , a hunting bow used as a single-stringed musical instrument. From the musical bow, families of stringed instruments developed; since each string played a single note, adding strings added new notes, creating bow harps , harps and lyres . In turn, this led to being able to play dyads and chords . Another innovation occurred when

684-431: A challenge to instrument builders, as compared with instruments that are only plucked (e.g., guitar), because on bowed instruments, the musician must be able to play one string at a time if they wish. As such, a bowed instrument must have a curved bridge that makes the "outer" strings lower in height than the "inner" strings. With such a curved bridge, the player can select one string at a time to play. On guitars and lutes ,

798-411: A clock or bell. Electric string instruments, such as the electric guitar , can also be played without touching the strings by using audio feedback . When an electric guitar is plugged into a loud, powerful guitar amplifier with a loudspeaker and a high level of distortion is intentionally used, the guitar produces sustained high-pitched sounds. By changing the proximity of the guitar to the speaker,

912-407: A combination of all three. Most tribal societies provide no guarantee of healthcare for the population as a whole. In such societies, healthcare is available to those who can afford to pay for it, have self-insured it (either directly or as part of an employment contract), or may be covered by care financed directly by the government or tribe. Transparency of information is another factor defining

1026-429: A combination of art and science (both basic and applied , under the umbrella of medical science ). For example, while stitching technique for sutures is an art learned through practice, knowledge of what happens at the cellular and molecular level in the tissues being stitched arises through science. Prescientific forms of medicine, now known as traditional medicine or folk medicine , remain commonly used in

1140-500: A decade after medical school. Furthermore, surgical training can be very difficult and time-consuming. Surgical subspecialties include those a physician may specialize in after undergoing general surgery residency training as well as several surgical fields with separate residency training. Surgical subspecialties that one may pursue following general surgery residency training: Other surgical specialties within medicine with their own individual residency training: Internal medicine

1254-553: A definitive diagnosis that would explain the patient's problem. On subsequent visits, the process may be repeated in an abbreviated manner to obtain any new history, symptoms, physical findings, lab or imaging results, or specialist consultations . Contemporary medicine is, in general, conducted within health care systems . Legal, credentialing , and financing frameworks are established by individual governments, augmented on occasion by international organizations, such as churches. The characteristics of any given health care system have

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1368-494: A delivery system. Access to information on conditions, treatments, quality, and pricing greatly affects the choice of patients/consumers and, therefore, the incentives of medical professionals. While the US healthcare system has come under fire for its lack of openness, new legislation may encourage greater openness. There is a perceived tension between the need for transparency on the one hand and such issues as patient confidentiality and

1482-513: A few minutes or a few weeks, depending on the complexity of the issue. The components of the medical interview and encounter are: The physical examination is the examination of the patient for medical signs of disease that are objective and observable, in contrast to symptoms that are volunteered by the patient and are not necessarily objectively observable. The healthcare provider uses sight, hearing, touch, and sometimes smell (e.g., in infection, uremia , diabetic ketoacidosis ). Four actions are

1596-531: A form of industrial contact dermatitis . Rosin is an ingredient in printing inks , photocopying and laser printing paper, varnishes , adhesives (glues), soap , paper sizing , soda , soldering fluxes , and sealing wax . Rosin can be used as a glazing agent in medicines and chewing gum . It is denoted by E number E915. A related glycerol ester (E445) can be used as an emulsifier in soft drinks . In pharmaceuticals , rosin forms an ingredient in several plasters and ointments. In industry, rosin

1710-517: A half a pear shape using three strings. Early versions of the violin and fiddle, by comparison, emerged in Europe through instruments such as the gittern , a four-stringed precursor to the guitar, and basic lutes . These instruments typically used catgut (animal intestine) and other materials, including silk, for their strings. String instrument design was refined during the Renaissance and into

1824-498: A heavier metal winding produces a lower pitch than a string of equal length without a metal winding. This can be seen on a 2016-era set of gut strings for double bass. The higher-pitched G string is often made of synthetic material, or sometimes animal intestine, with no metal wrapping. To enable the low E string to produce a much lower pitch with a string of the same length, it is wrapped with many wrappings of thin metal wire. This adds to its mass without making it too stiff. The frequency

1938-484: A key part of orchestras – cellos, violas, and upright basses, for example, were now standard instruments for chamber ensembles and smaller orchestras. At the same time, the 19th-century guitar became more typically associated with six-string models, rather than traditional five-string versions. Major changes to string instruments in the 20th century primarily involved innovations in electronic instrument amplification and electronic music – electric violins were available by

2052-405: A large scale, rosin is treated by destructive distillation for the production of rosin spirit, pinoline and rosin oil . The last enters into the composition of some of the solid lubricating greases , and is also used as an adulterant of other oils. The chief region of rosin production includes Indonesia , southern China (such as Guangdong , Guangxi , Fujian , Yunnan and Jiangxi ), and

2166-540: A lute-like instrument came from Mesopotamia prior to 3000 BC. A cylinder seal from c.  3100 BC or earlier (now in the possession of the British Museum) shows what is thought to be a woman playing a stick lute. From the surviving images, theorists have categorized the Mesopotamian lutes, showing that they developed into a long variety and a short. The line of long lutes may have developed into

2280-448: A patient to investigate or treat a pathological condition such as disease or injury , to help improve bodily function or appearance or to repair unwanted ruptured areas (for example, a perforated ear drum ). Surgeons must also manage pre-operative, post-operative, and potential surgical candidates on the hospital wards. In some centers, anesthesiology is part of the division of surgery (for historical and logistical reasons), although it

2394-401: A performance. The frequency is inversely proportional to the length: A string twice as long produces a tone of half the frequency (one octave lower). Pitch can be adjusted by varying the tension of the string. A string with less tension (looser) results in a lower pitch, while a string with greater tension (tighter) results in a higher pitch. Pushing a pedal on a pedal steel guitar raises

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2508-480: A period of supervised practice or internship , or residency . This can be followed by postgraduate vocational training. A variety of teaching methods have been employed in medical education, still itself a focus of active research. In Canada and the United States of America, a Doctor of Medicine degree, often abbreviated M.D., or a Doctor of Osteopathic Medicine degree, often abbreviated as D.O. and unique to

2622-458: A plectrum, bowed or (in the Aeolian harp, for instance) sounded by wind. The confusing plenitude of stringed instruments can be reduced to four fundamental type: zithers, lutes, lyres, and harps. In most string instruments, the vibrations are transmitted to the body of the instrument, which often incorporates some sort of hollow or enclosed area. The body of the instrument also vibrates, along with

2736-587: A secondary care setting. Tertiary care medical services are provided by specialist hospitals or regional centers equipped with diagnostic and treatment facilities not generally available at local hospitals. These include trauma centers , burn treatment centers, advanced neonatology unit services, organ transplants , high-risk pregnancy, radiation oncology , etc. Modern medical care also depends on information – still delivered in many health care settings on paper records, but increasingly nowadays by electronic means . In low-income countries, modern healthcare

2850-561: A significant impact on the way medical care is provided. From ancient times, Christian emphasis on practical charity gave rise to the development of systematic nursing and hospitals, and the Catholic Church today remains the largest non-government provider of medical services in the world. Advanced industrial countries (with the exception of the United States ) and many developing countries provide medical services through

2964-408: A surface against which glass is polished when making optical components such as lenses . Rosin is added in small quantities to traditional linseed oil /sand gap fillers ("mastic"), used in building work. When mixed with waxes and oils, rosin is the main ingredient of mystic smoke , a gum which, when rubbed and suddenly stretched, appears to produce puffs of smoke from the fingertips. Rosin

3078-410: A system of universal health care that aims to guarantee care for all through a single-payer health care system or compulsory private or cooperative health insurance. This is intended to ensure that the entire population has access to medical care on the basis of need rather than ability to pay. Delivery may be via private medical practices, state-owned hospitals and clinics, or charities, most commonly

3192-403: A violin scale is only about 13 inches (33 cm). On the shorter scale of the violin, the left hand may easily reach a range of slightly more than two octaves without shifting position , while on the bass' longer scale, a single octave or a ninth is reachable in lower positions. In bowed instruments, the bow is normally placed perpendicularly to the string, at a point halfway between the end of

3306-403: Is a flux used in soldering . The lead - tin solder commonly used in electronics has 1 to 2% rosin by weight as a flux core, helping the molten metal flow and making a better connection by reducing the refractory solid oxide layer formed at the surface back to metal. It is frequently seen as a burnt or clear residue around new soldering. A mixture of pitch and rosin is used to make

3420-487: Is a method of playing on instruments such as the veena , banjo , ukulele , guitar, harp, lute , mandolin , oud , and sitar , using either a finger, thumb, or quills (now plastic plectra) to pluck the strings. Instruments normally played by bowing (see below) may also be plucked, a technique referred to by the Italian term pizzicato . Bowing (Italian: arco ) is a method used in some string instruments, including

3534-504: Is an FDA approved food additive. The name "colophony" originates from colophonia resina , Latin for "resin from Colophon " ( Ancient Greek : Κολοφωνία ῥητίνη , romanized :  Kolophōnía rhētínē ), an ancient Ionic city. Rosin is brittle and friable , with a faint piny odor. It is typically a glassy solid, though some rosins will form crystals , especially when brought into solution. The practical melting point varies with different specimens, some being semi-fluid at

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3648-870: Is an accepted version of this page Medicine is the science and practice of caring for patients, managing the diagnosis , prognosis , prevention , treatment , palliation of their injury or disease , and promoting their health . Medicine encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness . Contemporary medicine applies biomedical sciences , biomedical research , genetics , and medical technology to diagnose , treat, and prevent injury and disease, typically through pharmaceuticals or surgery , but also through therapies as diverse as psychotherapy , external splints and traction , medical devices , biologics , and ionizing radiation , amongst others. Medicine has been practiced since prehistoric times , and for most of this time it

3762-450: Is classified into primary, secondary, and tertiary care categories. Primary care medical services are provided by physicians , physician assistants , nurse practitioners , or other health professionals who have first contact with a patient seeking medical treatment or care. These occur in physician offices, clinics , nursing homes , schools, home visits, and other places close to patients. About 90% of medical visits can be treated by

3876-530: Is derived from Latin medicus , meaning "a physician". Medical availability and clinical practice vary across the world due to regional differences in culture and technology . Modern scientific medicine is highly developed in the Western world , while in developing countries such as parts of Africa or Asia, the population may rely more heavily on traditional medicine with limited evidence and efficacy and no required formal training for practitioners. In

3990-658: Is extensively used for its friction -increasing capacity in several fields: Other uses that are not based on friction: Rosin and its derivatives also exhibit wide-ranging pharmaceutical applications. Rosin derivatives show excellent film forming and coating properties. They are also used for tablet film and enteric coating purpose. Rosins have also been used to formulate microcapsules and nanoparticles. Glycerol , sorbitol , and mannitol esters of rosin are used as chewing gum bases for medicinal applications. The degradation and biocompatibility of rosin and rosin-based biomaterials has been examined in vitro and ex vivo . Rosin

4104-402: Is impractical. Instruments with a fingerboard are then played by adjusting the length of the vibrating portion of the strings. The following observations all apply to a string that is infinitely flexible (a theoretical assumption, because in practical applications, strings are not infinitely flexible) strung between two fixed supports. Real strings have finite curvature at the bridge and nut, and

4218-457: Is inversely proportional to the square root of the linear density: Given two strings of equal length and tension, the string with higher mass per unit length produces the lower pitch. The length of the string from nut to bridge on bowed or plucked instruments ultimately determines the distance between different notes on the instrument. For example, a double bass with its low range needs a scale length of around 42 inches (110 cm), whilst

4332-446: Is largely employed in making varnishes (including fine violin varnishes), sealing wax and various adhesives . It is also used for preparing shoemakers' wax , for pitching lager beer casks , and numerous other purposes such as providing backing surfaces to tin ware, copper ware, or even silver and gold vessels when embossing or engraving them. Its relatively low melting point, and firm solid form allows liquid rosin to be poured into

4446-409: Is mainly used on electric instruments because these have a pickup that amplifies only the local string vibration. It is possible on acoustic instruments as well, but less effective. For instance, a player might press on the seventh fret on a guitar and pluck it at the head side to make a tone resonate at the opposing side. On electric instruments, this technique generates multitone sounds reminiscent of

4560-595: Is not a surgical discipline. Other medical specialties may employ surgical procedures, such as ophthalmology and dermatology , but are not considered surgical sub-specialties per se. Surgical training in the U.S. requires a minimum of five years of residency after medical school. Sub-specialties of surgery often require seven or more years. In addition, fellowships can last an additional one to three years. Because post-residency fellowships can be competitive, many trainees devote two additional years to research. Thus in some cases surgical training will not finish until more than

4674-400: Is often too expensive for the average person. International healthcare policy researchers have advocated that "user fees" be removed in these areas to ensure access, although even after removal, significant costs and barriers remain. Separation of prescribing and dispensing is a practice in medicine and pharmacy in which the physician who provides a medical prescription is independent from

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4788-523: Is one of the five main divisions of instruments in the Hornbostel–Sachs scheme of musical instrument classification . Hornbostel–Sachs divides chordophones into two main groups: instruments without a resonator as an integral part of the instrument (which have the classification number 31, also known as 'simple'); and instruments with such a resonator (which have the classification number 32, also known as 'composite'). Most western instruments fall into

4902-687: Is one of the oldest string instruments. Ancestors of the modern bowed string instruments are the rebab of the Islamic Empires, the Persian kamanche and the Byzantine lira . Other bowed instruments are the rebec , hardingfele , nyckelharpa , kokyū , erhu , igil , sarangi , morin khuur , and K'ni . The hurdy-gurdy is bowed by a wheel. Rarely, the guitar has been played with a bow (rather than plucked) for unique effects. The third common method of sound production in stringed instruments

5016-548: Is run off through a tap at the bottom of the still, and purified by passing through straining wadding. Rosin varies in color, according to the age of the tree from which the turpentine is drawn and the degree of heat applied in distillation, from an opaque , almost pitch-black substance through grades of brown and yellow to an almost perfectly transparent colorless glassy mass. The commercial grades are numerous, ranging by letters from A (the darkest) to N (extra pale), superior to which are W (window glass) and WW (water-white) varieties,

5130-399: Is simply melted, poured into a hollow thin-skinned object, and left to harden. Prolonged exposure to rosin fumes released during soldering can cause occupational asthma (formerly called colophony disease in this context) in sensitive individuals, although it is not known which component of the fumes causes the problem. The type of rosin used with bowed string instruments is determined by

5244-486: Is steamed for additional naphtha recovery prior to burning for energy recovery. After the solvent has been recovered, "the terpene oils are separated by fractional distillation and recovered mainly as refined turpentine, dipentene, and pine oil. The nonvolatile residue from the extract is wood rosin of rather dark color. Upgrading of the rosin is carried out by clarification methods that generally may include bed-filtering or furfural -treatment of rosin-solvent solution." On

5358-462: Is the medical specialty dealing with the prevention, diagnosis, and treatment of adult diseases. According to some sources, an emphasis on internal structures is implied. In North America, specialists in internal medicine are commonly called "internists". Elsewhere, especially in Commonwealth nations, such specialists are often called physicians . These terms, internist or physician (in

5472-429: Is the resinous constituent of the oleo-resin exuded by various species of pine , known in commerce as crude turpentine . The separation of the oleo-resin into the essential oil (spirit of turpentine) and common rosin is accomplished by distillation in large copper stills . The essential oil is carried off at a temperature of between 100 °C (212 °F)° and 160 °C (320 °F), leaving fluid rosin, which

5586-406: Is to strike the string. The piano and hammered dulcimer use this method of sound production. Even though the piano strikes the strings, the use of felt hammers means that the sound that is produced can nevertheless be mellow and rounded, in contrast to the sharp attack produced when a very hard hammer strikes the strings. Violin family string instrument players are occasionally instructed to strike

5700-560: The Baroque period (1600–1750) of musical history. Violins and guitars became more consistent in design and were roughly similar to acoustic guitars of the 2000s. The violins of the Renaissance featured intricate woodwork and stringing, while more elaborate bass instruments such as the bandora were produced alongside quill-plucked citterns , and Spanish body guitars. In the 19th century, string instruments were made more widely available through mass production, with wood string instruments

5814-547: The departments of Gironde and Landes , where the maritime pine P. pinaster is extensively cultivated. In the north of Europe, rosin is obtained from the Scots pine P. sylvestris , and throughout European countries local supplies are obtained from other species of pine, with Aleppo pine P. halepensis being particularly important in the Mediterranean region. The fumes released during soldering have been cited as

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5928-517: The developed world , evidence-based medicine is not universally used in clinical practice; for example, a 2007 survey of literature reviews found that about 49% of the interventions lacked sufficient evidence to support either benefit or harm. In modern clinical practice, physicians and physician assistants personally assess patients to diagnose , prognose, treat, and prevent disease using clinical judgment. The doctor-patient relationship typically begins with an interaction with an examination of

6042-409: The harp and the electric bass . Other examples include the sitar , rebab , banjo , mandolin , ukulele , and bouzouki . In the Hornbostel–Sachs scheme of musical instrument classification , used in organology , string instruments are called chordophones. According to Sachs , Chordophones are instruments with strings. The strings may be struck with sticks, plucked with the bare fingers or

6156-918: The pharmacist who provides the prescription drug . In the Western world there are centuries of tradition for separating pharmacists from physicians. In Asian countries, it is traditional for physicians to also provide drugs. Working together as an interdisciplinary team , many highly trained health professionals besides medical practitioners are involved in the delivery of modern health care. Examples include: nurses , emergency medical technicians and paramedics , laboratory scientists, pharmacists , podiatrists , physiotherapists , respiratory therapists , speech therapists , occupational therapists , radiographers, dietitians , and bioengineers , medical physicists , surgeons , surgeon's assistant , surgical technologist . The scope and sciences underpinning human medicine overlap many other fields. A patient admitted to

6270-455: The piano , which has sets of 88 strings to enable the performer to play 88 different notes). The other is to provide a way to stop the strings along their length to shorten the part that vibrates, which is the method used in guitar and violin family instruments to produce different notes from the same string. The piano and harp represent the first method, where each note on the instrument has its own string or course of multiple strings tuned to

6384-428: The saxophone and trumpet . The development of guitar amplifiers, which contained a power amplifier and a loudspeaker in a wooden cabinet , let jazz guitarists play solos and be heard over a big band. The development of the electric guitar provided guitarists with an instrument that was built to connect to guitar amplifiers. Electric guitars have magnetic pickups , volume control knobs and an output jack. In

6498-422: The strings with their fingers or a plectrum (pick) , and others by hitting the strings with a light wooden hammer or by rubbing the strings with a bow , like violins . In some keyboard instruments, such as the harpsichord , the musician presses a key that plucks the string. Other musical instruments generate sound by striking the string. With bowed instruments, the player pulls a rosined horsehair bow across

6612-469: The tamburs and pandura . The line of short lutes was further developed to the east of Mesopotamia, in Bactria , Gandhara , and Northwest India, and shown in sculpture from the 2nd century BC through the 4th or 5th centuries AD. During the medieval era , instrument development varied in different regions of the world. Middle Eastern rebecs represented breakthroughs in terms of shape and strings, with

6726-688: The violin , viola , cello , and the double bass (of the violin family ), and the old viol family. The bow consists of a stick with a "ribbon" of parallel horse tail hairs stretched between its ends. The hair is coated with rosin so it can grip the string; moving the hair across a string causes a stick-slip phenomenon , making the string vibrate , and prompting the instrument to emit sound. Darker grades of rosin grip well in cool, dry climates, but may be too sticky in warmer, more humid weather. Violin and viola players generally use harder, lighter-colored rosin than players of lower-pitched instruments, who tend to favor darker, softer rosin. The ravanahatha

6840-430: The 1920s and were an important part of emerging jazz music trends in the United States. The acoustic guitar was widely used in blues and jazz , but as an acoustic instrument, it was not loud enough to be a solo instrument, so these genres mostly used it as an accompaniment rhythm section instrument. In big bands of the 1920s, the acoustic guitar played backing chords, but it was not loud enough to play solos like

6954-465: The 1960s and 1970s, such as fuzz pedals , flangers , and phasers , enabling performers to create unique new sounds during the psychedelic rock era. Breakthroughs in electric guitar and bass technologies and playing styles enabled major breakthroughs in pop and rock music in the 1960s and 1970s. The distinctive sound of the amplified electric guitar was the centerpiece of new genres of music such as blues rock and jazz-rock fusion . The sonic power of

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7068-408: The 1960s, larger, more powerful guitar amplifiers were developed, called "stacks". These powerful amplifiers enabled guitarists to perform in rock bands that played in large venues such as stadiums and outdoor music festivals (e.g., Woodstock Music Festival ). Along with the development of guitar amplifiers, a large range of electronic effects units , many in small stompbox pedals, were introduced in

7182-470: The UK where all doctors are now required by law to work less than 48 hours per week on average. The following are some major medical specialties that do not directly fit into any of the above-mentioned groups: Some interdisciplinary sub-specialties of medicine include: Medical education and training varies around the world. It typically involves entry level education at a university medical school , followed by

7296-487: The United States, can be searched at http://data.medobjectives.marian.edu/ Archived 4 October 2018 at the Wayback Machine . In most countries, it is a legal requirement for a medical doctor to be licensed or registered. In general, this entails a medical degree from a university and accreditation by a medical board or an equivalent national organization, which may ask the applicant to pass exams. This restricts

7410-473: The United States, must be completed in and delivered from a recognized university. Since knowledge, techniques, and medical technology continue to evolve at a rapid rate, many regulatory authorities require continuing medical education . Medical practitioners upgrade their knowledge in various ways, including medical journals , seminars, conferences, and online programs. A database of objectives covering medical knowledge, as suggested by national societies across

7524-446: The absence of scientific medicine and are thus called alternative medicine . Alternative treatments outside of scientific medicine with ethical, safety and efficacy concerns are termed quackery . Medicine ( UK : / ˈ m ɛ d s ɪ n / , US : / ˈ m ɛ d ɪ s ɪ n / ) is the science and practice of the diagnosis , prognosis , treatment , and prevention of disease . The word "medicine"

7638-406: The action and strings of the piano were taken out of its box, it could still be played. This is not true of the violin , because the string passes over a bridge located on the resonator box, so removing the resonator would mean the strings had no tension. Curt Sachs also broke chordophones into four basic subcategories, "zithers, lutes, lyres and harps." Dating to around c.  13,000 BC ,

7752-459: The air inside it. The vibration of the body of the instrument and the enclosed hollow or chamber make the vibration of the string more audible to the performer and audience. The body of most string instruments is hollow, in order to have better sound projection. Some, however—such as electric guitar and other instruments that rely on electronic amplification—may have a solid wood body. In musicology , string instruments are known as chordophones. It

7866-589: The basis of physical examination: inspection , palpation (feel), percussion (tap to determine resonance characteristics), and auscultation (listen), generally in that order, although auscultation occurs prior to percussion and palpation for abdominal assessments. The clinical examination involves the study of: It is to likely focus on areas of interest highlighted in the medical history and may not include everything listed above. The treatment plan may include ordering additional medical laboratory tests and medical imaging studies, starting therapy, referral to

7980-437: The bow harp was straightened out and a bridge used to lift the strings off the stick-neck , creating the lute. This picture of musical bow to harp bow is theory and has been contested. In 1965 Franz Jahnel wrote his criticism stating that the early ancestors of plucked instruments are not currently known. He felt that the harp bow was a long cry from the sophistication of the civilizations of western Asia in 4000 BC that took

8094-433: The bowed string instruments can also be plucked with the fingers, a technique called " pizzicato ". A wide variety of techniques are used to sound notes on the electric guitar , including plucking with the fingernails or a plectrum, strumming and even " tapping " on the fingerboard and using feedback from a loud, distorted guitar amplifier to produce a sustained sound. Some string instruments are mainly plucked, such as

8208-487: The bridge can be flat, because the strings are played by plucking them with the fingers, fingernails or a pick; by moving the fingers or pick to different positions, the player can play different strings. On bowed instruments, the need to play strings individually with the bow also limits the number of strings to about six or seven; with more strings, it would be impossible to select individual strings to bow. (Bowed strings can also play two bowed notes on two different strings at

8322-421: The bridge, because of its motion, is not exactly nodes of vibration. Hence the following statements about proportionality are approximations. Pitch can be adjusted by varying the length of the string. A longer string results in a lower pitch, while a shorter string results in a higher pitch. A concert harp has pedals that cause a hard object to make contact with a string to shorten its vibrating length during

8436-509: The broadest meaning of "medicine", there are many different specialties. In the UK, most specialities have their own body or college, which has its own entrance examination. These are collectively known as the Royal Colleges, although not all currently use the term "Royal". The development of a speciality is often driven by new technology (such as the development of effective anaesthetics) or ways of working (such as emergency departments);

8550-459: The considerable legal authority of the medical profession to physicians that are trained and qualified by national standards. It is also intended as an assurance to patients and as a safeguard against charlatans that practice inadequate medicine for personal gain. While the laws generally require medical doctors to be trained in "evidence based", Western, or Hippocratic Medicine, they are not intended to discourage different paradigms of health. In

8664-466: The diameter of the strings. Generally this means that the larger the instrument is, the softer the rosin should be. For instance, double bass rosin is generally soft enough to be pliable with slow movements. A cake of bass rosin left in a single position for several months will show evidence of flow, especially in warmer weather. Prolonged exposure to rosin, by handling rosin-coated products, such as laser printer or photocopying paper, can give rise to

8778-441: The difference is perhaps more subtle. In keyboard instruments, the contact point along the string (whether this be hammer, tangent, or plectrum) is a choice made by the instrument designer. Builders use a combination of experience and acoustic theory to establish the right set of contact points. In harpsichords, often there are two sets of strings of equal length. These "choirs" usually differ in their plucking points. One choir has

8892-468: The dynamic and timbre (tone colour) range of orchestras, bands, and solo performances. String instruments can be divided into three groups: It is also possible to divide the instruments into categories focused on how the instrument is played. All string instruments produce sound from one or more vibrating strings , transferred to the air by the body of the instrument (or by a pickup in electronically amplified instruments). They are usually categorised by

9006-788: The examination for the Membership of the Royal College of Physicians (MRCP) or the equivalent college in Scotland or Ireland. "Surgery" refers to the practice of operative medicine, and most subspecialties in this area require preliminary training in General Surgery, which in the UK leads to membership of the Royal College of Surgeons of England (MRCS). At present, some specialties of medicine do not fit easily into either of these categories, such as radiology, pathology, or anesthesia. Most of these have branched from one or other of

9120-417: The expertise or procedures performed by specialists. These include both ambulatory care and inpatient services, emergency departments , intensive care medicine , surgery services, physical therapy , labor and delivery , endoscopy units, diagnostic laboratory and medical imaging services, hospice centers, etc. Some primary care providers may also take care of hospitalized patients and deliver babies in

9234-498: The fingerboard and the bridge. However, different bow placements can be selected to change timbre . Application of the bow close to the bridge (known as sul ponticello ) produces an intense, sometimes harsh sound, which acoustically emphasizes the upper harmonics . Bowing above the fingerboard ( sul tasto ) produces a purer tone with less overtone strength, emphasizing the fundamental , also known as flautando , since it sounds less reedy and more flute-like. Bowed instruments pose

9348-401: The guitar, bass, violin, etc.) can be played using a magnetic field. An E-Bow is a small hand-held battery-powered device that magnetically excites the strings of an electric string instrument to provide a sustained, singing tone reminiscent of a held bowed violin note. Third bridge is a plucking method where the player frets a string and strikes the side opposite the bridge. The technique

9462-419: The guitarist can produce sounds that cannot be produced with standard plucking and picking techniques. This technique was popularized by Jimi Hendrix and others in the 1960s. It was widely used in psychedelic rock and heavy metal music . There are three ways to change the pitch of a vibrating string . String instruments are tuned by varying a string's tension because adjusting length or mass per unit length

9576-653: The gut and the kidneys. In the Commonwealth of Nations and some other countries, specialist pediatricians and geriatricians are also described as specialist physicians (or internists) who have subspecialized by age of patient rather than by organ system. Elsewhere, especially in North America, general pediatrics is often a form of primary care . There are many subspecialities (or subdisciplines) of internal medicine : Training in internal medicine (as opposed to surgical training), varies considerably across

9690-520: The heavy naphtha fraction (boiling between 90 and 115 °C (194 and 239 °F)) from a crude oil refinery . Multi-stage counter-current extraction is commonly used. In this process, fresh naphtha first contacts wood leached in intermediate stages, and naphtha laden with rosin from intermediate stages contacts unleached wood before vacuum distillation to recover naphtha from the rosin, along with fatty acids , turpentine, and other constituents later separated through steam distillation . Leached wood

9804-553: The hospital is usually under the care of a specific team based on their main presenting problem, e.g., the cardiology team, who then may interact with other specialties, e.g., surgical, radiology, to help diagnose or treat the main problem or any subsequent complications/developments. Physicians have many specializations and subspecializations into certain branches of medicine, which are listed below. There are variations from country to country regarding which specialties certain subspecialties are in. The main branches of medicine are: In

9918-434: The information provided. During the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. The medical encounter is then documented in the medical record, which is a legal document in many jurisdictions. Follow-ups may be shorter but follow the same general procedure, and specialists follow a similar process. The diagnosis and treatment may take only

10032-402: The latter having about three times the value of the common qualities. Tall oil rosin is produced during the distillation of crude tall oil, a by-product of the kraft paper making process. When pine trees are harvested "the resinous portions of fallen or felled trees like longleaf and slash pines, when allowed to remain upon the ground, resist decay indefinitely." This "stump waste", through

10146-478: The loudly amplified, highly distorted electric guitar was the key element of the early heavy metal music , with the distorted guitar being used in lead guitar roles, and with power chords as a rhythm guitar . The ongoing use of electronic amplification and effects units in string instruments, ranging from traditional instruments like the violin to the new electric guitar, added variety to contemporary classical music performances, and enabled experimentation in

10260-773: The narrow sense, common outside North America), generally exclude practitioners of gynecology and obstetrics, pathology, psychiatry, and especially surgery and its subspecialities. Because their patients are often seriously ill or require complex investigations, internists do much of their work in hospitals. Formerly, many internists were not subspecialized; such general physicians would see any complex nonsurgical problem; this style of practice has become much less common. In modern urban practice, most internists are subspecialists: that is, they generally limit their medical practice to problems of one organ system or to one particular area of medical knowledge. For example, gastroenterologists and nephrologists specialize respectively in diseases of

10374-504: The new specialty leads to the formation of a unifying body of doctors and the prestige of administering their own examination. Within medical circles, specialities usually fit into one of two broad categories: "Medicine" and "Surgery". "Medicine" refers to the practice of non-operative medicine, and most of its subspecialties require preliminary training in Internal Medicine. In the UK, this was traditionally evidenced by passing

10488-464: The northern part of Vietnam . Chinese rosin is obtained mainly from the turpentine of Masson's pine Pinus massoniana and slash pine P. elliottii . The latter species is native to the southeastern U.S., but is now widely planted in tree plantations in China. The South Atlantic and eastern Gulf states of the United States is a second chief region of production. American rosin is obtained from

10602-477: The patient's medical history and medical record , followed by a medical interview and a physical examination . Basic diagnostic medical devices (e.g., stethoscope , tongue depressor ) are typically used. After examining for signs and interviewing for symptoms , the doctor may order medical tests (e.g., blood tests ), take a biopsy , or prescribe pharmaceutical drugs or other therapies. Differential diagnosis methods help to rule out conditions based on

10716-402: The pitch of certain strings by increasing tension on them (stretching) through a mechanical linkage; release of the pedal returns the pitch to the original. Knee levers on the instrument can lower a pitch by releasing (and restoring) tension in the same way. A homemade washtub bass made out of a length of rope, a broomstick and a washtub can produce different pitches by increasing the tension on

10830-451: The player presses keys on to trigger a mechanism that sounds the strings, instead of directly manipulating the strings. These include the piano , the clavichord , and the harpsichord. With these keyboard instruments , strings are occasionally plucked or bowed by hand. Modern composers such as Henry Cowell wrote music that requires that the player reach inside the piano and pluck the strings directly, "bow" them with bow hair wrapped around

10944-440: The possible exploitation of information for commercial gain on the other. The health professionals who provide care in medicine comprise multiple professions , such as medics , nurses , physiotherapists , and psychologists . These professions will have their own ethical standards , professional education, and bodies. The medical profession has been conceptualized from a sociological perspective . Provision of medical care

11058-432: The primary care provider. These include treatment of acute and chronic illnesses, preventive care and health education for all ages and both sexes. Secondary care medical services are provided by medical specialists in their offices or clinics or at local community hospitals for a patient referred by a primary care provider who first diagnosed or treated the patient. Referrals are made for those patients who required

11172-491: The primitive technology and created "technically and artistically well-made harps, lyres, citharas, and lutes." Archaeological digs have identified some of the earliest stringed instruments in Ancient Mesopotamian sites, like the lyres of Ur , which include artifacts over three thousand years old. The development of lyre instruments required the technology to create a tuning mechanism to tighten and loosen

11286-427: The rope (producing a higher pitch) or reducing the tension (producing a lower pitch). The frequency is proportional to the square root of the tension: The pitch of a string can also be varied by changing the linear density (mass per unit length) of the string. In practical applications, such as with double bass strings or bass piano strings, extra weight is added to strings by winding them with metal. A string with

11400-432: The same note. (Many notes on a piano are strung with a "choir" of three strings tuned alike, to increase the volume.) A guitar represents the second method—the player's fingers push the string against the fingerboard so that the string is pressed firmly against a metal fret. Pressing the string against a fret while plucking or strumming it shortens the vibrating part and thus produces a different note. Medicine This

11514-531: The same time, a technique called a double stop .) Indeed, on the orchestral string section instruments, four strings are the norm, with the exception of five strings used on some double basses . In contrast, with stringed keyboard instruments, 88 courses are used on a piano , and even though these strings are arranged on a flat bridge, the mechanism can play any of the notes individually. Similar timbral distinctions are also possible with plucked string instruments by selecting an appropriate plucking point, although

11628-399: The second group, but the piano and harpsichord fall into the first. Hornbostel and Sachs' criterion for determining which sub-group an instrument falls into is that if the resonator can be removed without destroying the instrument, then it is classified as 31. The idea that the piano's casing, which acts as a resonator, could be removed without destroying the instrument, may seem odd, but if

11742-533: The string tension. Lyres with wooden bodies and strings used for plucking or playing with a bow represent key instruments that point towards later harps and violin-type instruments; moreover, Indian instruments from 500 BC have been discovered with anything from 7 to 21 strings. In Vietnam, a 2,000 year old, singularly stringed instrument made of deer antler was also discovered. Musicologists have put forth examples of that 4th-century BC technology, looking at engraved images that have survived. The earliest image showing

11856-449: The string with the stick of the bow, a technique called col legno . This yields a percussive sound along with the pitch of the note. A well-known use of col legno for orchestral strings is Gustav Holst 's "Mars" movement from The Planets suite. The aeolian harp employs a very unusual method of sound production: the strings are excited by the movement of the air. Some instruments that have strings have an attached keyboard that

11970-455: The strings, causing them to vibrate. With a hurdy-gurdy , the musician cranks a wheel whose rosined edge touches the strings. Bowed instruments include the string section instruments of the orchestra in Western classical music ( violin , viola , cello and double bass ) and a number of other instruments (e.g., viols and gambas used in early music from the Baroque music era and fiddles used in many types of folk music ). All of

12084-419: The strings, or play them by rolling the bell of a brass instrument such as a trombone on the array of strings. However, these are relatively rarely used special techniques. Other keyed string instruments, small enough for a strolling musician to play, include the plucked autoharp , the bowed nyckelharpa , and the hurdy-gurdy, which is played by cranking a rosined wheel. Steel-stringed instruments (such as

12198-404: The technique used to make the strings vibrate (or by the primary technique, in the case of instruments where more than one may apply). The three most common techniques are plucking, bowing, and striking. An important difference between bowing and plucking is that in the former the phenomenon is periodic so that the overtones are kept in a strictly harmonic relationship to the fundamental. Plucking

12312-458: The temperature of boiling water, others melting at 100 to 120 °C (212 to 248 °F). It is very flammable, burning with a smoky flame, so care should be taken when melting it. It is soluble in alcohol , ether , benzene and chloroform . Rosin consists mainly of abietic acid , and combines with caustic alkalis to form salts ( rosinates or pinates ) that are known as rosin soaps . In addition to its extensive use in soap making , rosin

12426-536: The turpentine of longleaf pine Pinus palustris and loblolly pine P. taeda . In Mexico , most of the rosin is derived from live tapping of several species of pine trees, but mostly Pinus oocarpa , Pinus leiophylla , Pinus devoniana and Pinus montezumae . Most production is concentrated in the west-central state of Michoacán . The main source of supply in Europe is the French district of Landes , in

12540-568: The two camps above; for example anaesthesia developed first as a faculty of the Royal College of Surgeons (for which MRCS/FRCS would have been required) before becoming the Royal College of Anaesthetists and membership of the college is attained by sitting for the examination of the Fellowship of the Royal College of Anesthetists (FRCA). Surgery is an ancient medical specialty that uses operative manual and instrumental techniques on

12654-405: The use of destructive distillation or solvent processes, can be used to make products including rosin. This type of rosin is typically called wood rosin . Because the turpentine and pine oil from destructive distillation "become somewhat contaminated with other distillation products", solvent processes are commonly used. In this process, stumps and roots are chipped and soaked in the light end of

12768-481: The vessel, and when cooled allows embossing or engraving of the vessel without deforming the vessel - even if it has a skin which is quite thin. Afterwards, the object can be reheated in an oven, and the rosin poured out for reuse. Any remaining rosin film can easily be rinsed away with alcohol or other solvents. Rosin is also sometimes used as internal reinforcement for very thin skinned metal objects - like silver, copper or tin plate candlesticks, or sculptures, where it

12882-418: The world: see the articles on medical education for more details. In North America, it requires at least three years of residency training after medical school, which can then be followed by a one- to three-year fellowship in the subspecialties listed above. In general, resident work hours in medicine are less than those in surgery, averaging about 60 hours per week in the US. This difference does not apply in

12996-419: Was an art (an area of creativity and skill), frequently having connections to the religious and philosophical beliefs of local culture. For example, a medicine man would apply herbs and say prayers for healing, or an ancient philosopher and physician would apply bloodletting according to the theories of humorism . In recent centuries, since the advent of modern science , most medicine has become

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