Ernst Leitz GmbH was a German corporation based in Wetzlar , a German centre for optics as well as an important location for the precision engineering industry.
74-485: Leica may refer to: Companies [ edit ] Ernst Leitz GmbH , later divided into: Leica Biosystems GmbH, a cancer diagnostics company Leica Camera AG, a German camera and optics manufacturer Leica Geosystems AG, a Swiss manufacturer of surveying and geomatics equipment Leica Microsystems GmbH, a German manufacturer of microscopes and other precision optics Other uses [ edit ] "Leica",
148-430: A habilitation thesis. In it he introduced the new technology of in vivo staining. One of his findings was that pigments can only be easily assimilated by living organisms if they are in granular form. He injected the dyes alizarin blue and indophenol blue into laboratory animals and established after their death that various organs had been coloured to different degrees. In organs with high oxygen saturation, indophenol
222-410: A barrier, with Lina Stern later coining the phrase. The medication triggered the so-called "Salvarsan war". On one side there was hostility on the part of those who feared a resulting moral breakdown of sexual inhibitions. Ehrlich was also accused, with clearly anti-Semitic undertones, of excessively enriching himself. In addition, Ehrlich's associate, Paul Uhlenhuth claimed priority in discovering
296-498: A cytotoxic biologically active drug), as they enable cytotoxic drugs to be selectively delivered to their designated targets (e.g. cancer cells). In 1910, a street was named after Ehrlich in Frankfurt-Sachsenhausen. In Nazi Germany , Ehrlich's achievements were ignored while Emil Adolf von Behring was stylised as the ideal Aryan scientist, and the street named after Ehrlich was given another name. Shortly after
370-401: A disease-causing organism, then a toxin for that organism could be delivered along with the agent of selectivity. Hence, a " magic bullet " ( Zauberkugel , his term for an ideal therapeutic agent) would be created that killed only the organism targeted. The concept of a "magic bullet" has to some extent been realised by the development of antibody-drug conjugates (a monoclonal antibody linked to
444-502: A doctorate with a dissertation entitled "Contributions to the Theory and Practice of Histological Staining" ( Beiträge zur Theorie und Praxis der histologischen Färbung ). One of the most outstanding results of his dissertation investigations was the discovery of a new cell type. Ehrlich discovered in the protoplasm of supposed plasma cells a granulate which could be made visible with the help of an alkaline dye. He thought this granulate
518-435: A dye in his research on the tuberculosis pathogen. In Ehrlich's view, an added benefit was that methylene blue also stained the long appendages of nerve cells, the axons . He initiated a doctoral dissertation on the subject, but did not follow up the topic himself. It was the opinion of the neurologist Ludwig Edinger that Ehrlich had thereby opened up a major new topic in the field of neurology . After mid-1889, when Ehrlich
592-431: A new urine test which could be used to distinguish various types of typhoid from simple cases of diarrhea. The intensity of staining made possible a disease prognosis. The pigment solution he used is known today as Ehrlich's reagent. Ehrlich's great achievement, but also a source of problems during his further career, was that he had initiated a new field of study interrelating chemistry, biology and medicine. Much of his work
666-500: A newly invented achromatic lens combination ) in 1849, describing a new optical formula he had developed. The ocular was capable of rendering an image with the correct perspective, free of the distortions typical of other microscopes at that time. Following his early death on 13 May 1855, his widow continued the business he had left behind, the "Optisches Institut" (optical institute). The fine mechanic Ernst Leitz I (1843–1920) from Baden arrived at Wetzlar in 1864 and entered service at
740-432: A reference for testing other serums. For the test itself, toxin and serum were mixed in a ratio so that their effects just cancelled each other when injected into a guinea pig. But since there was a large margin in determining whether symptoms of illness were present, Ehrlich established an unambiguous target: the death of the animal. The mixture was to be such that the test animal would die after four days. If it died earlier,
814-510: A song from the album Akeldama by Faceless Leica (river) , Romania Leica reel , a type of animatic production method for animation See also [ edit ] Laika (disambiguation) Lieka , a former settlement in Ethiopia Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Leica . If an internal link led you here, you may wish to change
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#1732771787276888-462: A stable concentration of diphtheria toxin was required. Ehrlich discovered that the toxin being used was perishable, in contrast to what had been assumed, which for him led to two consequences: he did not use the toxin as a standard, but instead a serum powder developed by Behring, which had to be dissolved in liquid shortly before use. The strength of a test toxin was first determined in comparison with this standard. The test toxin could then be used as
962-527: Is now south-west Poland . He was the second child of Rosa (Weigert) and Ismar Ehrlich, the leader of the local Jewish community. His father was an innkeeper and distiller of liqueurs and the royal lottery collector in Strehlen, a town of some 5,000 inhabitants. His grandfather, Heymann Ehrlich, had been a fairly successful distiller and tavern manager. Ehrlich was the uncle of Fritz Weigert and cousin of Karl Weigert . After elementary school, Paul attended
1036-599: Is the most distinguished German award for biomedical research. A European network of PhD studies in Medicinal Chemistry has been named after him (Paul Ehrlich MedChem Euro PhD Network). The Anti-Defamation League awards a Paul Ehrlich–Günther K. Schwerin Human Rights Prize. A crater of the moon was named after Ehrlich in 1970. Ehrlich's life and work was featured in the 1940 U.S. film Dr. Ehrlich's Magic Bullet with Edward G. Robinson in
1110-564: The Charité in Berlin as an assistant medical director under Theodor Frerichs, the founder of experimental clinical medicine, focusing on histology , hematology and colour chemistry (dyes). He married Hedwig Pinkus (1864–1948) in 1883 in the synagogue in Neustadt (now Prudnik, Poland). The couple had two daughters, Stephanie and Marianne. Hedwig was a sister of Max Pinkus , who was an owner of
1184-482: The Robert Koch Institute ) at Friedrich-Wilhelms-Universität (now Humboldt University) in Berlin. Koch was unable to give him any remuneration, but did offer him full access to laboratory staff, patients, chemicals and laboratory animals, which Ehrlich always remembered with gratitude. Ehrlich had started his first experiments on immunisation already in his private laboratory. He accustomed mice to
1258-424: The "inheritance" of acquired immunity. It was already known that in some cases after a smallpox or syphilis infection, specific immunity was transmitted from the parents to their offspring. Ehrlich rejected inheritance in the genetic sense because the offspring of a male mouse immunised against abrin and an untreated female mouse were not immune to abrin. He concluded that the foetus was supplied with antibodies via
1332-474: The 20,000th, and in 1899, the 50,000th was completed. Bacteriologist Robert Koch was given the company's 100,000th microscope in 1907. Paul Ehrlich , inventor of chemotherapy, received the 150,000th one, and Nobel laureate Gerhard Domagk , discoverer of sulfonamides , the 400,000th Leica instrument. By the end of the 19th century, the company had a worldwide reputation. Its product range by this point included several optical instruments besides microscopes. At
1406-604: The Georg-Speyer House in his memory which was erected next door to Ehrlich's institute. As director of the Georg-Speyer House, Ehrlich transferred his chemotherapeutic research there. He was looking for an agent which was as effective as methylene blue, but without its side effects. His model was on the one hand the impact of quinine on malaria, and on the other hand, in analogy to serum therapy, he thought there must also be chemical pharmaceuticals which would have just as specific an effect on individual diseases. His goal
1480-476: The Institute of Experimental Therapy. The chemist Gustav Embden , among others, worked there. Ehrlich informed his sponsors that cancer research meant basic research, and that a cure could not be expected soon. Among the results achieved by Ehrlich and his research colleagues was the insight that when tumors are cultivated by transplanting tumor cells, their malignancy increases from generation to generation. If
1554-561: The Optisches Institut. He was trained as an instrument maker for physical and chemical apparatus and had several years' experience making watches in Switzerland. Initially, Leitz was a part shareholder of the business (in 1865), but took over as sole owner in 1869, and continued it under his own name. Leitz introduced serial production, raising sales volume rapidly after 1871. Consulting with his clients, he continued to refine
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#17327717872761628-841: The Steglitz Institute for Serum Research and Serum Testing and the Frankfurt Royal Institute for Experimental Therapy, was named in 1947 after Ehrlich, its first director. Ehrlich's name is also borne by many schools and pharmacies, by the Paul-Ehrlich-Gesellschaft für Chemotherapie e. V. (PEG) in Frankfurt am Main, and the Paul-Ehrlich-Klinik in Bad Homburg vor der Höhe. The Paul Ehrlich and Ludwig Darmstaedter Prize
1702-489: The anatomist Heinrich Wilhelm Waldeyer , Ehrlich continued the research started by his cousin in pigments and staining tissues for microscopic study. He spent his eighth university semester in Freiburg im Breisgau investigating primarily the red dye dahlia (monophenylrosanilin), giving rise to his first publication. In 1878 he followed his dissertation supervisor Julius Friedrich Cohnheim to Leipzig, and that year obtained
1776-485: The antigen and the antibody he assumed there was an additional immune molecule, which he called an "additive" or a "complement". For him, the side chain contained at least two functional groups. For providing a theoretical basis for immunology as well as for his work on serum valency, Ehrlich was awarded the Nobel Prize for Physiology or Medicine in 1908 together with Élie Metchnikoff . Metchnikoff, who had researched
1850-464: The basis of the original Leica camera, as presented at the spring fair 1925 in Leipzig . The success of that camera was enormous and well beyond expectations. In 1925, the first polarising microscope was made, and in 1931 the first comparative macroscope for criminological applications. In 1932, Leitz pioneered a fluorescent microscope , and three years later a photometer developed by Max Berek . In
1924-596: The beginning of the new century, Leitz introduced eight-hour days and founded a health insurance society for employees. In 1913, it introduced a first fully functional binocular microscope . After the First World War, the economic situation of Leitz was dire. Ernst Leitz died in July 1920, and the leadership of the company passed to his son, Ernst Leitz II . Around 1920, Leitz employed around 1400 people, and by 1956, 6000. In 1924 Ernst Leitz II decided that in spite of
1998-572: The cellular branch of immunity, Phagocytosis , at the Pasteur Institute had previously sharply attacked Ehrlich. In 1901, the Prussian Ministry of Finance criticised Ehrlich for exceeding his budget and as a consequence reduced his income. In this situation Althoff arranged a contact with Georg Speyer, a Jewish philanthropist and joint owner of the bank house Lazard Speyer-Ellissen. The cancerous disease of Princess Victoria ,
2072-460: The conventional therapy of mercury salts. Manufactured by Hoechst AG, Salvarsan became the most widely prescribed drug in the world. It was the most effective drug for treating syphilis until penicillin became available in the 1940s. Salvarsan required improvement as to side effects and solubility and was replaced in 1911 with Neosalvarsan . Ehrlich's work illuminated the existence of the blood-brain barrier , although he himself never believed in such
2146-698: The death of this meritorious researcher for his great service to medical science and suffering humanity; his life’s work ensures undying fame and the gratitude of both his contemporaries and posterity". Ehrlich was buried at the Old Jewish Cemetery, Frankfurt (Block 114 N). In the early 1870s, Ehrlich's cousin Karl Weigert was the first person to stain bacteria with dyes and to introduce aniline pigments for histological studies and bacterial diagnostics. During his studies in Strassburg under
2220-433: The drug. Because some people died during the clinical testing, Ehrlich was accused of "stopping at nothing." In 1914, one of the most prominent accusers was convicted of criminal libel at a trial for which Ehrlich was called to testify. Though Ehrlich was thereby exonerated, the ordeal threw him into a depression from which he never fully recovered. Ehrlich reasoned that if a compound could be made that selectively targeted
2294-409: The end of the war the name Paul-Ehrlich-Strasse was reinstated, and today numerous German cities have streets named after Ehrlich. West Germany issued a postage stamp in 1954 on the 100th anniversary of the births of Ehrlich (14 March 1854) and Emil von Behring (15 March 1854). The 200 Deutsche Mark bank note, issued until 2001, featured Ehrlich. The German Paul Ehrlich Institute, the successor to
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2368-506: The existence of nucleated red blood cells, which he subdivided into normoblasts, megaloblasts, microblasts and poikiloblasts; he had discovered the precursors of erythrocytes. Ehrlich thus also laid the basis for the analysis of anemias , after he had created the basis for systematising leukemias with his investigation of white blood cells. His duties at the Charité included analysing patients' blood and urine specimens. In 1881 he published
2442-556: The extent that Ehrlich was quickly able to increase the level of immunity of the laboratory animals based on his experience with mice. Clinical tests with diphtheria serum early in 1894 were successful and in August the chemical company Hoechst started to market Behring's "Diphtheria Remedy synthesised by Behring-Ehrlich". The two discoverers had originally agreed to share any profits after the Hoechst share had been subtracted. Their contract
2516-453: The fields of hematology , immunology and antimicrobial chemotherapy . Among his foremost achievements were finding a cure for syphilis in 1909 and inventing the precursor technique to Gram staining bacteria. The methods he developed for staining tissue made it possible to distinguish between different types of blood cells, which led to the ability to diagnose numerous blood diseases . His laboratory discovered arsphenamine (Salvarsan),
2590-583: The first antibiotic and first effective medicinal treatment for syphilis , thereby initiating and also naming the concept of chemotherapy . Ehrlich introduced the concept of a magic bullet . He also made a decisive contribution to the development of an antiserum to combat diphtheria and conceived a method for standardising therapeutic serums . In 1908, he received the Nobel Prize in Physiology or Medicine for his contributions to immunology. He
2664-589: The first drug to be targeted against a specific pathogen: Salvarsan , a treatment for syphilis, which was at that time one of the most lethal and infectious diseases in Europe. In 1914, Ehrlich was awarded the Cameron Prize of the University of Edinburgh. Among the foreign guest scientists working with Ehrlich at his institute were two Nobel Prize winners, Henry Hallett Dale and Paul Karrer . The institute
2738-481: The immunity reaction, so easily produced by all kinds of cells, is prevented from acting against the organism's own elements". Emil Behring had worked at the Berlin Institute of Infectious Diseases until 1893 on developing an antiserum for treating diphtheria and tetanus but with inconsistent results. Koch suggested that Behring and Ehrlich cooperate on the project. This joint work was successful to
2812-455: The institute, as was tuberculin and later on various vaccines . Ehrlich's most important colleague at the institute was the Jewish physician and biologist Julius Morgenroth. Ehrlich postulated that cell protoplasm contains special structures which have chemical side chains (today's term is macromolecules ) to which the toxin binds, affecting function. If the organism survives the effects of
2886-549: The laboratory. Upon his return he established a private medical practice and small laboratory in Berlin-Steglitz. In 1891, Robert Koch invited Ehrlich to join the staff at his Berlin Institute of Infectious Diseases, where in 1896 a new branch, the Institute for Serum Research and Testing ( Institut für Serumforschung und Serumprüfung ), was established for Ehrlich's specialisation. Ehrlich was named its founding director. In 1899 his institute moved to Frankfurt am Main and
2960-466: The late 1930s, Ernst Leitz II assisted a number of Jewish employees in fleeing Germany. In 1942, Ernst Leitz GmbH employed a total of 195 foreign citizens. By January 1945, there were 989 forced laborers, 643 of them " Ostarbeiter ", predominantly from Ukraine, and 316 " Westarbeiter " from France and the Benelux. Besides cameras and microscopes, Leitz developed further optical products that would define
3034-506: The lecture in which he reported how he was able to identify the tuberculosis pathogen . Ehrlich later described this lecture as his "greatest experience in science". The day after Koch's lecture, Ehrlich had already made an improvement to Koch's staining method, which Koch unreservedly welcomed. From this date on, the two men were bound in friendship. In 1887 Ehrlich became an unsalaried lecturer in internal medicine ( Privatdozent für Innere Medizin ) at Berlin University, and in 1890 took over
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3108-583: The life cycle of the anthrax pathogen and had contacted Ferdinand Cohn , who was quickly convinced by Koch's work and introduced him to his Breslau colleagues. From 30 April to 2 May 1876, Koch presented his investigations in Breslau, which the student Ehrlich was able to attend. On 24 March 1882, Ehrlich was present when Koch, working since 1880 at the Imperial Public Health Office ( Kaiserliches Gesundheitsamt ) in Berlin, presented
3182-548: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Leica&oldid=1118582203 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Ernst Leitz GmbH Carl Kellner , mechanic and self-taught mathematician, published his treatise Das orthoskopische Ocular, eine neu erfundene achromatische Linsencombination ( The orthoscopic ocular,
3256-405: The malaria plasmodia disappeared from their blood. Ehrlich obtained methylene blue from the company Meister Lucius & Brüning AG (later renamed Hoechst AG), which started a long collaboration with this company. Before the Institute of Experimental Therapy had moved to Frankfurt, Ehrlich had already resumed work on methylene blue. After the death of Georg Speyer, his widow Franziska Speyer endowed
3330-411: The microscopes to their needs. The microscopes were produced for biomedical as well as industrial purposes, including mineralogy. Leitz microscopes improved on other models of their day in several ways, including lighting and optics, particularly with orthoscopic eyepieces . By 1880, the company had reached an annual production numbering 500. In 1887, the 10,000th microscope was shipped, four years later
3404-498: The mid-20th century, such as slide projectors of the "Prado" series, Leitz episcopes that were frequently used in schools and the Trinovid binoculars series. One by one, the three sons (Ludwig, Ernst and Günther) of Ernst Leitz II began work at the company. Having remained intact through World War II, the production facilities could be restarted immediately after the war ended. In 1948, a separate development lab for optical glass
3478-699: The name literally means "nonpoisonous", atoxyl does cause damage, especially to the optic nerve. Ehrlich elaborated the systematic testing of chemical compounds in the sense of screening as now practiced in the pharmaceutical industry. He discovered that Compound 418 - Arsenophenylglycine - had an impressive therapeutic effect and had it tested in Africa. With the support of his assistant Sahachiro Hata Ehrlich discovered in 1909 that Compound 606, Arsphenamine , effectively combatted " spirillum " spirochaetes bacteria, one of whose subspecies causes syphilis . The compound proved to have few side effects in human trials, and
3552-424: The poisons ricin and abrin . After feeding them with small but increasing dosages of ricin he ascertained that they had become "ricin-proof". Ehrlich interpreted this as immunisation and observed that it was abruptly initiated after a few days and was still in existence after several months, but mice immunised against ricin were just as sensitive to abrin as untreated animals. This was followed by investigations on
3626-426: The possibility that an organism's immune system could attack the organism's own tissue calling it "horror autotoxicus". It was Ehrlich's student, Ernest Witebsky , who demonstrated that autoimmunity could cause disease in humans. Ehrlich was the first to propose that regulatory mechanisms existed to protect an organism from autoimmunity, saying in 1906 that "the organism possesses certain contrivances by means of which
3700-587: The primary tumor is removed, then metastasis precipitously increases. Ehrlich applied bacteriological methods to cancer research. In analogy to vaccination, he attempted to generate immunity to cancer by injecting weakened cancer cells. Both in cancer research and chemotherapy research (see below) he introduced the methodologies of Big Science . In 1885 Ehrlich's monograph "The Need of the Organism for Oxygen" ( Das Sauerstoffbedürfnis des Organismus – Eine farbenanalytische Studie ) appeared, which he also submitted as
3774-443: The pulmonary circulation of the mother. This idea was supported by the fact that this "inherited immunity" decreased after a few months. In another experiment he exchanged the offspring of treated and untreated female mice. The mice which were nursed by the treated females were protected from the poison, providing the proof that antibodies can also be conveyed in milk. Ehrlich also researched autoimmunity , but he specifically rejected
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#17327717872763848-457: The serum was too weak and was rejected. Ehrlich claimed to have made the determination of the valency of serum as accurate as it would be with chemical titration . This again demonstrates his tendency to quantify the life sciences. Influenced by the mayor of Frankfurt am Main, Franz Adickes, who endeavored to establish science institutions in Frankfurt in preparation of the founding of a university, Ehrlich's institute moved to Frankfurt in 1899 and
3922-482: The spirochetes disappeared in seven syphilis patients after this treatment. After extensive clinical testing (all the research participants had the negative example of tuberculin in mind) the Hoechst company began to market the compound toward the end of 1910 under the name Salvarsan. This was the first agent with a specific therapeutic effect to be created on the basis of theoretical considerations. Salvarsan proved to be amazingly effective, particularly when compared with
3996-533: The textile factory in Neustadt (later known as ZPB "Frotex" ). He settled in the villa of the Fränkel family on Wiesenerstrasse in Neustadt. After completing his clinical education and habilitation at the prominent Charité medical school and teaching hospital in Berlin in 1886, Ehrlich travelled to Egypt and other countries in 1888 and 1889, in part to cure a case of tuberculosis which he had contracted in
4070-624: The time-honoured secondary school Maria-Magdalenen-Gymnasium in Breslau , where he met Albert Neisser , who later became a colleague. As a schoolboy (inspired by his cousin Karl Weigert who owned one of the first microtomes ), he became fascinated by the process of staining microscopic tissue substances. He retained that interest during his subsequent medical studies at the universities of Breslau, Strasbourg , Freiburg im Breisgau and Leipzig . After obtaining his doctorate in 1882, he worked at
4144-441: The toxin, the blocked side-chains are replaced by new ones. This regeneration can be trained, the name for this phenomenon being immunisation . If the cell produces a surplus of side chains, these might also be released into the blood as antibodies. In the following years Ehrlich expanded his side chain theory using concepts ("amboceptors", "receptors of the first, second and third order", etc.) which are no longer customary. Between
4218-548: The tuberculosis station at a public hospital in Berlin-Moabit at Koch's request. This was where Koch's hoped-for tuberculosis therapeutic agent tuberculin was under study; and Ehrlich had even injected himself with it. In the ensuing tuberculin scandal , Ehrlich tried to support Koch and stressed the value of tuberculin for diagnostic purposes. In 1891 Koch invited Ehrlich to work at the newly founded Institute of Infectious Diseases ( Institut für Infektionskrankheiten – now
4292-400: The weak economy, the apparatus designed by his employee Oskar Barnack should enter serial production. As part of working on cinematic gear, Barnack had customized 35mm film for use in photographic cameras. Since he felt a ratio of 2:3 to be aesthetic, the resulting format was 24mm in height and 36mm wide. Around this, he constructed a camera designed for casual snapshots. This design formed
4366-561: The widow of the German Emperor Friedrich II, had received much public attention and prompted a collection among wealthy Frankfurt citizens, including Speyer, in support of cancer research. Ehrlich had also received from the German Emperor Wilhelm II a personal request to devote all his energy to cancer research. Such efforts led to the founding of a department for cancer research affiliated with
4440-633: Was a dry specimen technique, which he also developed. A drop of blood placed between two glass slides and heated over a Bunsen burner fixed the blood cells while still allowing them to be stained. Ehrlich used both alkaline and acid dyes, and also created new "neutral" dyes. For the first time this made it possible to differentiate the lymphocytes among the leucocytes (white blood cells). By studying their granulation he could distinguish between nongranular lymphocytes, mono- and poly-nuclear leucocytes, eosinophil granulocytes and mast cells. Starting in 1880, Ehrlich also studied red blood cells . He demonstrated
4514-523: Was a sign of good nourishment, and accordingly named these cells mast cells , (from the German word for an animal-fattening feed, Mast ). This focus on chemistry was unusual for a medical dissertation. In it, Ehrlich presented the entire spectrum of known staining techniques and the chemistry of the pigments employed. While he was at the Charité, Ehrlich elaborated upon the differentiation of white blood cells according to their different granules. A precondition
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#17327717872764588-461: Was added, and from 1953, the design of microscope optics was computer-assisted. Upon the death of their father in 1956, the three sons jointly assumed leadership of the company. In the late 20th century the company was divided into four independent companies: Paul Ehrlich Paul Ehrlich ( German: [ˈpaʊl ˈʔeːɐ̯lɪç] ; 14 March 1854 – 20 August 1915) was a Nobel Prize -winning German physician and scientist who worked in
4662-433: Was changed several times and finally Ehrlich was eventually pressured into accepting a profit share of only eight percent. Ehrlich resented what he considered as unfair treatment, and his relationship with Behring was thereafter problematic, a situation which later escalated over the issue of the valency of tetanus serum. Ehrlich recognised that the principle of serum therapy had been developed by Behring and Kitasato . But he
4736-432: Was established in 1896 in Berlin-Steglitz, with Ehrlich as director (which required him to cancel all his contracts with Hoechst). In this function and as honorary professor at Berliner University he had annual earnings of 6,000 marks, approximately the salary of a university professor. In addition to a testing department the institute had a research department. In order to determine the effectiveness of diphtheria antiserum,
4810-492: Was highly variable, a government system was established to guarantee their safety and effectiveness. Beginning 1 April 1895, only government-approved serum could be sold in the German Reich. The testing station for diphtheria serum was provisionally housed at the Institute of Infectious Diseases. At the initiative of Friedrich Althoff, an Institute of Serum Research and Testing ( Institut für Serumforschung und Serumprüfung )
4884-588: Was of the opinion that he had been the first to develop a serum which could also be used on humans, and that his role in developing the diphtheria serum had been insufficiently acknowledged. Behring, for his part, schemed against Ehrlich at the Prussian Ministry of Culture, and from 1900 on Ehrlich refused to collaborate with him. Von Behring was the sole recipient of the first Nobel Prize in Medicine, in 1901, for contributions to research on diphtheria. Since antiserums were an entirely new type of medicine whose quality
4958-508: Was rejected by the medical profession, which lacked the requisite chemical knowledge. It also meant that there was no suitable professorship in sight for Ehrlich. When a student in Breslau, Ehrlich was given an opportunity by the pathologist Julius Friedrich Cohnheim to conduct extensive research and was also introduced to Robert Koch , who was at the time a district physician in Wollstein, Posen Province. In his spare time, Koch had clarified
5032-648: Was renamed Paul Ehrlich Institute in Ehrlich's honour in 1947. In 1914, Ehrlich signed the Manifesto of the Ninety-Three which was a defence of Germany's World War I politics and militarism. On 17 August 1915 Ehrlich suffered a heart attack and died on 20 August in Bad Homburg vor der Höhe . Wilhelm II the German emperor, wrote in a telegram of condolence, "I, along with the entire civilized world, mourn
5106-540: Was renamed the Institute of Experimental Therapy ( Institut für experimentelle Therapie ). One of his important collaborators there was Max Neisser. In 1904, Ehrlich received a full position of honorary professor from the University of Göttingen . In 1906 Ehrlich became the director of the Georg Speyer House in Frankfurt, a private research foundation affiliated with his institute. Here he discovered in 1909
5180-531: Was renamed the Royal Prussian Institute of Experimental Therapy ( Königlich Preußisches Institut für Experimentelle Therapie ). The German quality-control methodology was copied by government serum institutes all over the world, and they also obtained the standard serum from Frankfurt. After diphtheria antiserum, tetanus serum and various bactericide serums for use in veterinary medicine were developed in rapid sequence. These were also evaluated at
5254-532: Was retained; in organs with medium saturation, indophenol was reduced, but not alizarin blue. And in areas with low oxygen saturation, both pigments were reduced. With this work, Ehrlich also formulated the conviction which guided his research: that all life processes can be traced to processes of physical chemistry occurring in the cell. In the course of his investigations Ehrlich came across methylene blue , which he regarded as particularly suitable for staining bacteria. Later, Robert Koch also used methylene blue as
5328-628: Was the founder and first director of what is now known as the Paul Ehrlich Institute , a German research institution and medical regulatory body that is the nation's federal institute for vaccines and biomedicines. A genus of Rickettsiales bacteria, Ehrlichia , is named after him. Ehrlich has been called "father of immunology". Ehrlich was born 14 March 1854 in Strehlen in the Prussian province of Lower Silesia in what
5402-527: Was to find a Therapia sterilisans magna , in other words a treatment that could kill all disease pathogens. As a model for experimental therapy Ehrlich used a guinea pig disease trypanosoma and tested out various chemical substances on laboratory animals. The trypanosomes could indeed be successfully killed with the dye trypan red. Beginning in 1906, he intensively investigated atoxyl and had it tested by Robert Koch along with other arsenic compounds during Koch's sleeping sickness expedition of 1906/07. Although
5476-446: Was unemployed, he privately continued his research on methylene blue. His work on in vivo staining gave him the idea of using it therapeutically. Since the parasite family of Plasmodiidae – which includes the malaria pathogen – can be stained with methylene blue, he thought it could possibly be used in the treatment of malaria. In the case of two patients so treated at the city hospital in Berlin-Moabit, their fever indeed subsided and
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