A thickening agent or thickener is a substance which can increase the viscosity of a liquid without substantially changing its other properties. Edible thickeners are commonly used to thicken sauces , soups , and puddings without altering their taste; thickeners are also used in paints , inks , explosives , and cosmetics .
61-493: See text Hares and jackrabbits are mammals belonging to the genus Lepus . They are herbivores , and live solitarily or in pairs. They nest in slight depressions called forms, and their young are able to fend for themselves shortly after birth . The genus includes the largest lagomorphs . Most are fast runners with long, powerful hind legs, and large ears that dissipate body heat. Hare species are native to Africa, Eurasia and North America. A hare less than one year old
122-399: A pyrophoric replacement of napalm, is a triethylaluminium thickened with polyisobutylene . Fuel thickeners are mostly composed of the same thickeners as polar liquids (water), due to the fact that they are " bipolar ", that is, they have a polar and an apolar group. The only change is in the orientation of these groups. In the non-polar medium reverse micelle formation occurs. Because
183-655: A circle with their heads near its centre. While each of the animals appears to have two ears, only three ears are depicted. The ears form a triangle at the centre of the circle and each is shared by two of the hares. The image has been traced from Christian churches in the English county of Devon right back along the Silk Road to China, via western and eastern Europe and the Middle East. Before its appearance in China, it
244-853: A given application, due to differences in taste, clarity, and their responses to chemical and physical conditions. For example, for acidic foods, arrowroot is a better choice than cornstarch , which loses thickening potency in acidic mixtures. At (acidic) pH levels below 4.5, guar gum has sharply reduced aqueous solubility, thus also reducing its thickening capability. If the food is to be frozen, tapioca or arrowroot are preferable over cornstarch, which becomes spongy when frozen. Food thickeners frequently are based on either polysaccharides ( starches , vegetable gums , and pectin ), or proteins . This category includes starches as arrowroot , cornstarch , katakuri starch , potato starch , sago , wheat flour, almond flour , tapioca and their starch derivatives . A flavorless powdered starch used for this purpose
305-596: A hare. The hare was once regarded as an animal sacred to Aphrodite and Eros because of its high libido. Live hares were often presented as a gift of love. In European witchcraft , hares were either witches' familiars or a witch who had transformed themself into a hare. Now pop mythology associates the hare with the Anglo-Saxon goddess Ēostre as an explanation for the Easter Bunny , but is wholly modern in origin and has no authentic basis. In European tradition,
366-410: A mass, holding the associated liquid by surface tension , but which can separate or slide when sufficient force is applied. This causes the thixotropic or shear-thinning property (also frequently exhibited by gels), where the viscosity is non-Newtonian and becomes lower as the shearing force or time increases; their usefulness is primarily that the resulting increase in viscosity is large compared to
427-509: A medical condition such as dysphagia causes difficulty in swallowing. Some of these people may benefit from thickened fluids , but the benefits are limited. Many other food ingredients are used as thickeners, usually in the final stages of preparation of specific foods. These thickeners have a flavor and are not markedly stable, thus are not suitable for general use. However, they are very convenient and effective, and hence are widely used. Different thickeners may be more or less suitable in
488-724: A medium viscosity gel but may have some aftertaste. High-methoxy pectin is one of the most widely used gelling agents in food processing . It reacts with some sugars and acids and sometimes includes minerals to improve gelling process. Low-methoxy pectin reacts with calcium, and is used for the preparation of low sugar jams. Functional flours are produced from specific cereal variety ( wheat , maize , rice or other) conjugated to specific heat treatment able to increase stability, consistency and general functionalities. These functional flours are resistant to industrial stresses such as acidic pH, sterilisation, freeze conditions, and can help food industries to formulate with natural ingredients . For
549-531: A much-prized dish enjoyed in Greece and Cyprus and communities in the diaspora. The hare (and in recent times, the rabbit) is a staple of Maltese cuisine . The dish was presented to the island's Grandmasters of the Sovereign Military Order of Malta , as well as Renaissance Inquisitors resident on the island, several of whom went on to become pope . According to Jewish tradition , the hare
610-549: A paste, is used for gravies, sauces and stews. Cereal grains ( oatmeal , couscous , farina , etc.) are used to thicken soups . Yogurt is popular in Eastern Europe and Middle East for thickening soups. Soups can also be thickened by adding grated starchy vegetables before cooking, though these will add their own flavour. Tomato puree also adds thickness as well as flavour. Egg yolks are a traditional sauce thickener in professional cooking; they have rich flavor and offer
671-442: A tall jug that stands in a pan of water. It traditionally is served with the hare's blood (or the blood is added right at the end of the cooking process) and port wine . Jugged hare is described in an influential 18th-century English cookbook, The Art of Cookery by Hannah Glasse , with a recipe titled, "A Jugged Hare", that begins, "Cut it into little pieces, lard them here and there ..." The recipe goes on to describe cooking
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#1732773329978732-402: A temperature; on the other hand, cooking starches too short or not hot enough might lead to an unpleasant starchy taste or cause water to seep out of the finished product after cooling. Also, higher viscosity causes foods to burn more easily during cooking. As an alternative to adding more thickener, recipes may call for reduction of the food's water content by lengthy simmering . When cooking, it
793-474: A time. Normally a shy animal, the European brown hare changes its behavior in spring, when it can be seen in daytime chasing other hares. This appears to be competition between males (called bucks ) to attain dominance for breeding. During this spring frenzy, animals of both sexes can be seen "boxing", one hare striking another with its paws. This behavior gives rise to the idiom " mad as a March hare ". This
854-457: A velvety smooth texture but achieve the desired thickening effect only in a narrow temperature range. Overheating easily ruins such a sauce, which can make egg yolk difficult to use as a thickener for amateur cooks. Other thickeners used by cooks are nuts (including rehan ) or glaces made of meat or fish . Many thickening agents require extra care in cooking. Some starches lose their thickening quality when cooked for too long or at too high
915-488: A warren. Other rabbits and hares live and give birth in simple forms (shallow depression or flattened nest of grass) above the ground. Hares usually do not live in groups. Young hares are adapted to the lack of physical protection, relative to that afforded by a burrow, by being born fully furred and with eyes open. They are hence precocial , able to fend for themselves soon after birth. By contrast, rabbits are altricial , being born blind and hairless. Easily digestible food
976-417: A wide variety of conditions, and reproduce quickly, so hunting is often less regulated than for other varieties of game. They are a common source or protein worldwide. Because of their extremely low fat content, they are a poor choice as a survival food . Hares can be prepared in the same manner as rabbits—commonly roasted or parted for breading and frying. Hasenpfeffer (also spelled Hasenfeffer )
1037-486: Is a fecula (from the Latin faecula , diminutive of faex, "dregs"). Other sugar polymers include vegetable gums such as pectin from Citrus peel, guar gum from the guar bean, and locust bean gum from the carob bean. Agar , alginin and carrageenan are polysaccharides extracted from algae, xanthan gum is a polysaccharide secreted by the bacterium Xanthomonas campestris , and carboxymethyl cellulose
1098-675: Is a vertebrate animal of the class Mammalia ( / m ə ˈ m eɪ l i . ə / ). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair , and three middle ear bones . These characteristics distinguish them from reptiles and birds , from which their ancestors diverged in the Carboniferous Period over 300 million years ago. Around 6,400 extant species of mammals have been described and divided into 27 orders . The largest orders of mammals, by number of species , are
1159-456: Is a synthetic gum derived from cellulose . Proteins used as food thickeners include collagen , egg whites , and gelatin . Other thickening agents act on the proteins already present in a food; for example sodium pyrophosphate , which acts on casein in milk during the preparation of instant pudding . Gelling agents are food additives used to thicken and stabilize various foods, like jellies , desserts and candies . The agents provide
1220-434: Is a traditional German stew made from marinated rabbit or hare. Pfeffer here means not only the obvious spicing with pepper and other spices, but also means a dish in which the animal's blood is used as a thickening agent for the sauce. Wine or vinegar is also a prominent ingredient, to lend a sourness to the recipe. Lagos stifado ( Λαγός στιφάδο )—hare stew with pearl onions, vinegar, red wine, and cinnamon—is
1281-531: Is among mammals deemed not kosher , and therefore not eaten by observant Jews. Muslims deem coney meat (rabbit, pika , hyrax ) to be halal , and in Egypt , hare and rabbit are popular meats for mulukhiyah ( jute leaf soup), especially in Cairo . The blood of a freshly killed hare can be collected for consumption in a stew or casserole in a cooking process known as jugging . First the entrails are removed from
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#17327733299781342-667: Is called a "leveret". A group of hares is called a "husk", a "down", or a "drove". Members of the Lepus genus are considered true hares, distinguishing them from rabbits which make up the rest of the Leporidae family. However, there are five leporid species with "hare" in their common names which are not considered true hares: the hispid hare ( Caprolagus hispidus ), and four species known as red rock hares ( Pronolagus ). Conversely, several Lepus species are called "jackrabbits", but classed as hares rather than rabbits. The pet known as
1403-511: Is generally better to add thickener cautiously; if over-thickened, more water may be added but loss of flavour and texture may result. Food thickening can be important for people facing medical issues with chewing or swallowing , as foods with a thicker consistency can reduce the chances of choking , or of inhalation of liquids or food particles, which can lead to aspiration pneumonia . Fumed silica and similar products form stiff microscopic chains or fibers which interlock or agglomerate into
1464-543: Is present not only in intermale competition, but also among females (called does ) toward males to prevent copulation. Hares are generally larger than rabbits, with longer ears, and have black markings on their fur. Hares, like all leporids , have jointed, or kinetic , skulls, unique among mammals. They have 48 chromosomes, while rabbits have 44. Hares have not been domesticated, while some rabbits are raised for food and kept as pets . Some rabbits live and give birth underground in burrows, with many burrows in an area forming
1525-572: Is primarily driven by human poaching and habitat destruction , primarily deforestation . Over 70% of mammal species are in the orders Rodentia , Chiroptera , and Eulipotyphla . Mammal classification has been through several revisions since Carl Linnaeus initially defined the class, and at present , no classification system is universally accepted. McKenna & Bell (1997) and Wilson & Reeder (2005) provide useful recent compendiums. Simpson (1945) provides systematics of mammal origins and relationships that had been taught universally until
1586-435: Is processed in the gastrointestinal tract, expelling the waste as regular feces. For nutrients that are harder to extract, hares, like all lagomorphs , ferment fiber in the cecum and expel the mass as cecotropes , which they ingest again, a practice called cecotrophy . The cecotropes are absorbed in the small intestine to use the nutrients. The 34 species listed are: Hares and rabbits are plentiful in many areas, adapt to
1647-426: Is the viviparous placental mammals , so named for the temporary organ ( placenta ) used by offspring to draw nutrition from the mother during gestation . Most mammals are intelligent , with some possessing large brains, self-awareness , and tool use . Mammals can communicate and vocalize in several ways, including the production of ultrasound , scent marking , alarm signals , singing , echolocation ; and, in
1708-603: The Belgian hare is a domesticated European rabbit which has been selectively bred to resemble a hare. Hares are swift animals and can run up to 80 km/h (50 mph) over short distances. Over longer distances, the European hare ( Lepus europaeus ) can run up to 55 km/h (35 mph). The five species of jackrabbits found in central and western North America are able to run at 65 km/h (40 mph) over longer distances, and can leap up to 3 m (10 ft) at
1769-473: The Cretaceous . The relationships between these three lineages is contentious, and all three possible hypotheses have been proposed with respect to which group is basal . These hypotheses are Atlantogenata (basal Boreoeutheria), Epitheria (basal Xenarthra) and Exafroplacentalia (basal Afrotheria). Boreoeutheria in turn contains two major lineages— Euarchontoglires and Laurasiatheria . Estimates for
1830-564: The International Union for Conservation of Nature (IUCN) completed a five-year Global Mammal Assessment for its IUCN Red List , which counted 5,488 species. According to research published in the Journal of Mammalogy in 2018, the number of recognized mammal species is 6,495, including 96 recently extinct. The word " mammal " is modern, from the scientific name Mammalia coined by Carl Linnaeus in 1758, derived from
1891-556: The Latin mamma ("teat, pap"). In an influential 1988 paper, Timothy Rowe defined Mammalia phylogenetically as the crown group of mammals, the clade consisting of the most recent common ancestor of living monotremes ( echidnas and platypuses ) and therian mammals ( marsupials and placentals ) and all descendants of that ancestor. Since this ancestor lived in the Jurassic period, Rowe's definition excludes all animals from
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1952-464: The UKTV Food television channel found only 1.6% of the people under 25 recognized jugged hare by name. Seven of ten stated they would refuse to eat jugged hare if it were served at the house of a friend or a relative. In England, a now rarely served dish is potted hare. The hare meat is cooked, then covered in at least one inch (preferably more) of butter. The butter is a preservative (excludes air);
2013-606: The biological classification scheme used, are the primates : apes , monkeys , and lemurs ; the Cetartiodactyla : whales and even-toed ungulates ; and the Carnivora which includes cats , dogs , weasels , bears , seals , and allies. According to Mammal Species of the World , 5,416 species were identified in 2006. These were grouped into 1,229 genera , 153 families and 29 orders. In 2008,
2074-406: The dominant terrestrial animal group from 66 million years ago to the present. The basic mammalian body type is quadrupedal , with most mammals using four limbs for terrestrial locomotion ; but in some, the limbs are adapted for life at sea , in the air , in trees or underground . The bipeds have adapted to move using only the two lower limbs, while the rear limbs of cetaceans and
2135-541: The konjac plants, and aiyu or ice jelly from the Ficus pumila climbing fig plant. Agar-agar produces a very clear gel with light residual taste. Gelatin sheets disperse easily with no residual taste, but powdered form may have some taste. Kappa carragreenan may include potassium chloride to improve the gelling process and produces a clear product with very little aftertaste. Iota carrageenan contains sodium chloride which improves gel formation. Sodium alginate produces
2196-428: The rodents , bats , and Eulipotyphla (including hedgehogs , moles and shrews ). The next three are the primates (including humans , monkeys and lemurs ), the even-toed ungulates (including pigs , camels , and whales ), and the Carnivora (including cats , dogs , and seals ). Mammals are the only living members of Synapsida ; this clade , together with Sauropsida (reptiles and birds), constitutes
2257-439: The sea cows are mere internal vestiges . Mammals range in size from the 30–40 millimetres (1.2–1.6 in) bumblebee bat to the 30 metres (98 ft) blue whale —possibly the largest animal to have ever lived. Maximum lifespan varies from two years for the shrew to 211 years for the bowhead whale . All modern mammals give birth to live young, except the five species of monotremes , which lay eggs. The most species-rich group
2318-557: The suspension of other ingredients or emulsions which increases the stability of the product. Thickening agents are often regulated as food additives and as cosmetics and personal hygiene product ingredients. Some thickening agents are gelling agents ( gellants ), forming a gel , dissolving in the liquid phase as a colloid mixture that forms a weakly cohesive internal structure. Others act as mechanical thixotropic additives with discrete particles adhering or interlocking to resist strain . Thickening agents can also be used when
2379-564: The Hare , perhaps the best-known among Aesop's Fables , the hare loses a race through being too confident in its swiftness. In Irish folklore, the hare is often associated with the Aos sí or other pagan elements. In these stories, characters who harm hares often suffer dreadful consequences. A study in 2004 followed the history and migration of a symbolic image of three hares with conjoined ears. In this image, three hares are seen chasing each other in
2440-573: The basis of the Br'er Rabbit stories. The hare appears in English folklore in the saying " as mad as a March hare " and in the legend of the White Hare that alternatively tells of a witch who takes the form of a white hare and goes out looking for prey at night or of the spirit of a broken-hearted maiden who cannot rest and who haunts her unfaithful lover. The constellation Lepus is taken to represent
2501-492: The case of humans, complex language . Mammals can organize themselves into fission–fusion societies , harems , and hierarchies —but can also be solitary and territorial . Most mammals are polygynous , but some can be monogamous or polyandrous . Domestication of many types of mammals by humans played a major role in the Neolithic Revolution , and resulted in farming replacing hunting and gathering as
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2562-812: The clade originating with the last common ancestor of Sinoconodon and living mammals. The earliest-known synapsid satisfying Kemp's definitions is Tikitherium , dated 225 Ma , so the appearance of mammals in this broader sense can be given this Late Triassic date. However, this animal may have actually evolved during the Neogene. As of the early 21st century, molecular studies based on DNA analysis have suggested new relationships among mammal families. Most of these findings have been independently validated by retrotransposon presence/absence data . Classification systems based on molecular studies reveal three major groups or lineages of placental mammals— Afrotheria , Xenarthra and Boreoeutheria —which diverged in
2623-444: The closest thing to an official classification of mammals, despite its known issues. Most mammals, including the six most species-rich orders , belong to the placental group. The three largest orders in numbers of species are Rodentia : mice , rats , porcupines , beavers , capybaras , and other gnawing mammals; Chiroptera : bats; and Eulipotyphla : shrews , moles , and solenodons . The next three biggest orders, depending on
2684-532: The dish can be stored for up to several months. It is served cold, often on bread or as an appetizer. No extant domesticated hares exist. However, hare remains have been found in a wide range of human settlement sites, some showing signs of use beyond simple hunting and eating: The hare in African folk tales is a trickster ; some of the stories about the hare were retold among enslaved Africans in America and are
2745-1332: The divergence times between these three placental groups range from 105 to 120 million years ago, depending on the type of DNA used (such as nuclear or mitochondrial ) and varying interpretations of paleogeographic data. Monotremata Marsupialia Xenarthra Afrotheria Glires Euarchonta [REDACTED] Eulipotyphla Chiroptera Pholidota Carnivora [REDACTED] Perissodactyla [REDACTED] Artiodactyla [REDACTED] Monotremata [REDACTED] Paucituberculata [REDACTED] Didelphimorphia [REDACTED] Microbiotheria Notoryctemorphia [REDACTED] Peramelemorphia [REDACTED] Dasyuromorphia [REDACTED] Diprotodontia [REDACTED] Cingulata [REDACTED] Pilosa [REDACTED] Hyracoidea [REDACTED] Sirenia [REDACTED] Proboscidea [REDACTED] Tubulidentata [REDACTED] Macroscelidea [REDACTED] Afrosoricida [REDACTED] Eulipotyphla [REDACTED] Chiroptera [REDACTED] Pholidota [REDACTED] Carnivora [REDACTED] Perissodactyla [REDACTED] Artiodactyla [REDACTED] Scandentia [REDACTED] Lagomorpha [REDACTED] Thickening agent Thickeners may also improve
2806-585: The earlier Triassic , despite the fact that Triassic fossils in the Haramiyida have been referred to the Mammalia since the mid-19th century. If Mammalia is considered as the crown group, its origin can be roughly dated as the first known appearance of animals more closely related to some extant mammals than to others. Ambondro is more closely related to monotremes than to therian mammals while Amphilestes and Amphitherium are more closely related to
2867-451: The end of the 20th century. However, since 1945, a large amount of new and more detailed information has gradually been found: The paleontological record has been recalibrated, and the intervening years have seen much debate and progress concerning the theoretical underpinnings of systematization itself, partly through the new concept of cladistics . Though fieldwork and lab work progressively outdated Simpson's classification, it remains
2928-451: The exception of India ink and the few other water-soluble pigments, but these would have very little coverage and at best would stain wood slightly. All modern paints and inks will have some pigment added at the factory for opacity and to control the specularity of the finish, from matte to high gloss, dependent on thickener used, but more so on the size of the particles added as opacity modifier. Particle sizes of 1 μm and below will be
2989-426: The final consumer, these ingredients are more accepted because they are shown as "flour" in the ingredient list. Flour is often used for thickening gravies , gumbos , and stews . The most basic type of thickening agent, flour blended with water to make a paste, is called whitewash . It must be cooked in thoroughly to avoid the taste of uncooked flour. Roux , a mixture of flour and fat (usually butter) cooked into
3050-463: The foods with texture through formation of a gel . Some stabilizers and thickening agents are gelling agents. Typical gelling agents are based on polysaccharides such as natural gums , starches , pectins and agar-agar or proteins such as gelatin . Examples are: Commercial jellies used in East Asian cuisines include the glucomannan polysaccharide gum used to make "lychee cups" from
3111-537: The hare carcass before it is hung in a larder by its hind legs, which causes blood to accumulate in the chest cavity. One method of preserving the blood after draining it from the hare (since the hare is usually hung for a week or more) is to mix it with red wine vinegar to prevent coagulation , and then to store it in a freezer. Jugged hare, known as civet de lièvre in France, is a whole hare, cut into pieces, marinated, and cooked with red wine and juniper berries in
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#17327733299783172-600: The hare symbolises the two qualities of swiftness and timidity. The latter once gave the European hare the Linnaean name Lepus timidus that is now limited to the mountain hare . Several ancient fables depict the Hare in flight ; in one concerning The Hares and the Frogs they even decide to commit mass suicide until they come across a creature so timid that it is even frightened of them. Conversely, in The Tortoise and
3233-668: The larger Amniota clade. Early synapsids are referred to as " pelycosaurs ." The more advanced therapsids became dominant during the Guadalupian . Mammals originated from cynodonts , an advanced group of therapsids, during the Late Triassic to Early Jurassic . Mammals achieved their modern diversity in the Paleogene and Neogene periods of the Cenozoic era, after the extinction of non-avian dinosaurs , and have been
3294-527: The limit of high gloss, probably confined to luxury automotive coatings, and about 100 μm particulates will make a bumpy surface on the microscopic scale, which scatters light and makes the surface appear matte. Rheology modifiers in common use: All of the above rheology modifiers are used in the 0.2% to 2.0% range In petrochemistry, gelling agents, also called solidifiers , are chemicals capable of reacting with oil spills and forming rubber-like solids. The gelled coagulated oil then can be removed from
3355-408: The pieces of hare in water in a jug set within a bath of boiling water to cook for three hours. In the 19th century, a myth arose that Glasse's recipe began with the words "First, catch your hare." Many other British cookbooks from before the middle of the 20th century have recipes for jugged hare. Merle and Reitch have this to say about jugged hare, for example: In 2006, a survey of 2021 people for
3416-716: The primary source of food for humans. This led to a major restructuring of human societies from nomadic to sedentary, with more co-operation among larger and larger groups, and ultimately the development of the first civilizations . Domesticated mammals provided, and continue to provide, power for transport and agriculture, as well as food ( meat and dairy products ), fur , and leather . Mammals are also hunted and raced for sport, kept as pets and working animals of various types, and are used as model organisms in science. Mammals have been depicted in art since Paleolithic times, and appear in literature, film, mythology, and religion. Decline in numbers and extinction of many mammals
3477-651: The quantity of silica added. Fumed silica is generally accepted as safe as a food additive and is frequently used in cosmetics. Additives such as precipitated silica , fine talc , or chalk also meet the definition of thickening agent in that they increase viscosity and body while not affecting the target property of a mixture. Thickening agents used in cosmetics or personal hygiene products include viscous liquids such as polyethylene glycol , synthetic polymers such as carbomer (a trade name for polyacrylic acid ) and vegetable gums . Some thickening agents may also function as stabilizers when they are used to maintain
3538-415: The stability of an emulsion . Some emollients , such as petroleum jelly and various waxes may also function as thickening agents in an emulsion. One of the main use of thickeners is in the paint and printing industries, which depend heavily on rheology modifiers, to prevent pigments settling to the bottom of the can, yielding inconsistent results. Water based formulas would be nearly impossible with
3599-548: The therians; as fossils of all three genera are dated about 167 million years ago in the Middle Jurassic , this is a reasonable estimate for the appearance of the crown group. T. S. Kemp has provided a more traditional definition: " Synapsids that possess a dentary – squamosal jaw articulation and occlusion between upper and lower molars with a transverse component to the movement" or, equivalently in Kemp's view,
3660-519: The water surface by skimming, suction devices, or nets. Calm or only moderately rough sea is required. Various materials are used to convert liquid explosives to a gel form. Nitrocellulose and other nitro esters are often used. Other possibilities include nitrated guar gum . Many fuels used in incendiary devices require thickening for increased performance. Aluminium salts of fatty acids are frequently used. Some formulations (e.g. Napalm -B) use polymeric thickeners. Thickened pyrophoric agent ,
3721-524: Was possibly first depicted in the Middle East before being reimported centuries later. Its use is associated with Christian, Jewish , Islamic and Buddhist sites stretching back to about 600 CE. The hare has given rise to local place names, as they can often be observed in favoured localities. An example in Scotland is "Murchland", " murchen " being a Scots word for a hare. Mammals A mammal (from Latin mamma 'breast')
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