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70-462: The Ilchester Cheese Company is a cheese company based in Ilchester , Somerset . The Ilchester brands are part of Norseland, a subsidiary of Norwegian dairy company Tine SA . In 1962, Ken Seaton, a hotelier in Ilchester , Somerset , England, tried combining cheese with chives , Worthington E Bitter beer and a blend of spices . This and other blended cheeses are manufactured and distributed by

140-472: A blue cheese such as Stilton (hard: cow's milk), Roquefort (medium: ewe's milk) or Bleu d'Auvergne (medium-soft cow's milk); and a soft/medium-soft goat's cheese (e.g. Sainte-Maure de Touraine , Pantysgawn , Crottin de Chavignol ). A cheeseboard 70 feet (21 m) long was used to feature the variety of cheeses manufactured in Wisconsin , where the state legislature recognizes a " cheesehead " hat as

210-479: A cost-saving measure, the US military routinely uses a wide range of SLEP tested products past their official shelf life if drugs have been stored properly. Preservatives and antioxidants may be incorporated into some food and drug products to extend their shelf life. Some companies use induction sealing and vacuum /oxygen-barrier pouches to assist in the extension of the shelf life of their products where oxygen causes

280-732: A crumbly, flavorful Greek cheese. Cheese produced in Europe, where climates are cooler than the Middle East, required less salt for preservation. With less salt and acidity, the cheese became a suitable environment for useful microbes and molds, giving aged cheeses their respective flavors. The earliest ever discovered preserved cheese was found in the Taklamakan Desert in Xinjiang , China, dating back as early as 1615 BCE (3600 years before present). Ancient Greek mythology credited Aristaeus with

350-469: A dairy farmer from Rome , New York, who in 1851 started making cheese in an assembly-line fashion using the milk from neighboring farms; this made cheddar cheese one of the first US industrial foods . Within decades, hundreds of such commercial dairy associations existed. The 1860s saw the beginnings of mass-produced rennet, and by the turn of the century scientists were producing pure microbial cultures. Before then, bacteria in cheesemaking had come from

420-439: A drug. Most medications continue to be effective and safe for a time after the expiration date. A rare exception is a case of renal tubular acidosis purportedly caused by expired tetracycline . A study conducted by the U.S. Food and Drug Administration covered over 100 drugs, prescription and over-the-counter. The study showed that about 90% of them were safe and effective as long as 15 years past their expiration dates. Joel Davis,

490-442: A former FDA expiration-date compliance chief, said that with a handful of exceptions - notably nitroglycerin, insulin and some liquid antibiotics - most expired drugs are probably effective. Shelf life is not significantly studied during drug development , and drug manufacturers have economic and liability incentives to specify shorter shelf lives so that consumers are encouraged to discard and repurchase products. One major exception

560-416: A low oxygen transmission rate and the use of oxygen absorbers can help extend the shelf life. Produce and other products with respiration often require packaging with controlled barrier properties. The use of a modified atmosphere in the package can extend the shelf life for some products. The concept of shelf life applies to other products besides food and drugs. Gasoline has a shelf life, although it

630-589: A memorandum that scientific data could not be shared with the public, public health departments, other government agencies, and drug manufacturers. State and local programs are not permitted to participate. The failure to share data has caused foreign governments to refuse donations of expired medications. One exception occurred during the 2010 Swine Flu Epidemic when the FDA authorized expired Tamiflu based on SLEP Data. The SLEP discovered that drugs such as Cipro remained effective nine years after their shelf life, and, as

700-653: A new word started to be used: formaticum , from caseus formatus , or "cheese shaped in a mold". It is from this word that the French fromage , standard Italian formaggio , Catalan formatge , Breton fourmaj , and Occitan fromatge (or formatge ) are derived. Of the Romance languages, Spanish, Portuguese , Romanian , Tuscan and some Southern Italian dialects use words derived from caseus ( queso , queijo , caș , cacio and caso for example). The word cheese

770-863: A protective rind, allows selling when markets are favorable. Vacuum packaging of block-shaped cheeses and gas-flushing of plastic bags with mixtures of carbon dioxide and nitrogen are used for storage and mass distribution of cheeses in the 21st century. The word cheese comes from Latin caseus , from which the modern word casein is derived. The earliest source is from the proto-Indo-European root *kwat- , which means "to ferment , become sour". That gave rise to cīese or cēse (in Old English ) and chese (in Middle English ). Similar words are shared by other West Germanic languages — West Frisian tsiis , Dutch kaas , German Käse , Old High German chāsi —all from

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840-441: A range of foodstuffs since ancient times, it is probable that the process of cheese making was discovered accidentally by storing milk in a container made from the stomach of an animal, resulting in the milk being turned to curd and whey by the rennet from the stomach. There is a legend —with variations—about the discovery of cheese by an Arab trader who used this method of storing milk. The earliest evidence of cheesemaking in

910-505: A separation of their fats. Many of these can be coaxed into melting smoothly in the presence of acids or starch . Fondue , with wine providing the acidity, is a good example of a smoothly melted cheese dish. Elastic stringiness is a quality that is sometimes enjoyed, in dishes including pizza and Welsh rarebit . Even a melted cheese eventually turns solid again, after enough moisture is cooked off. The saying "you can't melt cheese twice" (meaning "some things can only be done once") refers to

980-588: A state symbol. The nutritional value of cheese varies widely. Cottage cheese may consist of 4% fat and 11% protein while some whey cheeses are 15% fat and 11% protein, and triple cream cheeses can contain 36% fat and 7% protein. In general, cheese is a rich source (20% or more of the Daily Value , DV) of calcium , protein , phosphorus , sodium and saturated fat . A 28-gram (one ounce ) serving of cheddar cheese contains about 7 grams (0.25 oz) of protein and 202 milligrams of calcium. Nutritionally, cheese

1050-410: Is a different French cheese for every day of the year, and Charles de Gaulle once asked "how can you govern a country in which there are 246 kinds of cheese?"). At refrigerator temperatures, the fat in a piece of cheese is as hard as unsoftened butter, and its protein structure is stiff as well. Flavor and odor compounds are less easily liberated when cold. For improvements in flavor and texture, it

1120-411: Is a less ambiguous term for what is often referred to as an "expiration date". Most food is still edible after the expiration date. A product that has passed its shelf life might still be safe, but quality is no longer guaranteed. In most food stores, waste is minimized by using stock rotation , which involves moving products with the earliest sell by date from the warehouse to the sales area, and then to

1190-510: Is a sandwich of five layers of different English cheeses. The company also produces vegan cheeses. 51°00′46″N 2°41′01″W  /  51.0128°N 2.6837°W  / 51.0128; -2.6837 This food and/or confectionery corporation or company-related article is a stub . You can help Misplaced Pages by expanding it . This article about a company of the UK is a stub . You can help Misplaced Pages by expanding it . Cheese Cheese

1260-443: Is a type of dairy product produced in a range of flavors, textures , and forms by coagulation of the milk protein casein . It comprises proteins and fat from milk (usually the milk of cows , buffalo , goats or sheep ). During production, milk is usually acidified and either the enzymes of rennet or bacterial enzymes with similar activity are added to cause the casein to coagulate. The solid curds are then separated from

1330-621: Is based on moisture content, which is then further discriminated by fat content and curing or ripening methods. Some attempts have been made to rationalise the classification of cheese—a scheme was proposed by Pieter Walstra which uses the primary and secondary starter combined with moisture content, and Walter and Hargrove suggested classifying by production methods which produces 18 types, which are then further grouped by moisture content. The British Cheese Board once claimed that Britain has approximately 700 distinct local cheeses; France and Italy have perhaps 400 each (a French proverb holds there

1400-423: Is essentially concentrated milk, but altered by the culturing and aging processes: it takes about 200 grams (7.1 oz) of milk to provide that much protein, and 150 grams (5.3 oz) to equal the calcium, though values for water-soluble vitamins and minerals can vary widely. Shelf life Shelf life is the recommended maximum time for which products or fresh (harvested) produce can be stored, during which

1470-492: Is largely a result of the breakdown of casein proteins and milkfat into a complex mix of amino acids , amines , and fatty acids . Some cheeses have additional bacteria or molds intentionally introduced before or during aging. In traditional cheesemaking, these microbes might be already present in the aging room; they are allowed to settle and grow on the stored cheeses. More often today, prepared cultures are used, giving more consistent results and putting fewer constraints on

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1540-421: Is not an accurate indicator of how long the food can safely be stored. For example, pasteurized milk can remain fresh for five days after its sell-by date if it is refrigerated properly. However, improper storage of milk may result in bacterial contamination or spoilage before the expiration date. The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of

1610-433: Is not normally necessary to display a sell-by date. Exceeding this time-frame will introduce harmful varnishes , etc. into equipment designed to operate with these products, i.e. a gasoline lawn mower that has not been properly winterized could incur damage that will prevent use in the spring, and require expensive servicing to the carburetor. Some glues and adhesives also have a limited storage life, and will stop working in

1680-635: Is occasionally employed, as in Head cheese , to mean "shaped in a mold". Cheese is an ancient food whose origins predate recorded history . There is no conclusive evidence indicating where cheesemaking originated, whether in Europe , Central Asia or the Middle East . The earliest proposed dates for the origin of cheesemaking range from around 8000 BCE, when sheep were first domesticated . Because animal skins and inflated internal organs have provided storage vessels for

1750-437: Is often mathematically modelled around a parameter (concentration of a chemical compound, a microbiological index, or moisture content). For some foods, health issues are important in determining shelf life. Bacterial contaminants are ubiquitous, and foods left unused too long will often be contaminated by substantial amounts of bacterial colonies and become dangerous to eat, leading to food poisoning . However, shelf life alone

1820-438: Is often specified in conjunction with a specific product, package, and distribution system. For example, an MRE field ration is designed to have a shelf life of three years at 80 °F (27 °C) and six months at 100 °F (38 °C). Nearly all chemical reactions can occur at normal temperatures (although different reactions proceed at different rates). However most reactions are accelerated by high temperatures, and

1890-481: Is produced by adding annatto . Other added ingredients may include black pepper , garlic, chives or cranberries . A cheesemonger, or specialist seller of cheeses, may have expertise with selecting, purchasing, receiving, storing and ripening cheeses. Most cheeses are acidified by bacteria, which turn milk sugars into lactic acid ; the addition of rennet completes the curdling. Vegetarian varieties of rennet are available; most are produced through fermentation by

1960-471: Is the Shelf Life Extension Program (SLEP) of the U.S. Department of Defense (DoD), which commissioned a major study of drug efficacy from the FDA starting in the mid-1980s. One criticism is that the U.S. Food and Drug Administration (FDA) refused to issue guidelines based on SLEP research for normal marketing of pharmaceuticals even though the FDA performed the study. The SLEP and FDA signed

2030-538: Is why old rubber bands and other rubber products soften and get crispy, and lose their elasticity as they age. The often quoted rule of thumb is that chemical reactions double their rate for each temperature increase of 10 °C (18 °F) because activation energy barriers are more easily surmounted at higher temperatures. However, as with many rules of thumb, there are many caveats and exceptions. The rule works best for reactions with activation energy values around 50 kJ/mole; many of these are important at

2100-407: Is why shelf life is generally extended by temperature control: ( refrigeration , insulated shipping containers , controlled cold chain , etc.) and why some medicines and foods must be refrigerated. Since such storing of such goods is temporal in nature and shelf life is dependent on the temperature controlled environment, they are also referred to as cargo even when in special storage to emphasize

2170-406: Is widely advised that cheeses be allowed to warm up to room temperature before eating. If the cheese is further warmed, to 26–32 °C (79–90 °F), the fats will begin to "sweat out" as they go beyond soft to fully liquid. Above room temperatures, most hard cheeses melt. Rennet-curdled cheeses have a gel -like protein matrix that is broken down by heat. When enough protein bonds are broken,

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2240-616: The Helvetii . Cheese was an everyday food and cheesemaking a mature art in the Roman empire. Pliny's Natural History (77  CE) devotes a chapter (XI, 97) to describing the diversity of cheeses enjoyed by Romans of the early Empire. He stated that the best cheeses came from the villages near Nîmes , but did not keep long and had to be eaten fresh. Cheeses of the Alps and Apennines were as remarkable for their variety then as now. A Ligurian cheese

2310-600: The River Thames Ceswican , meaning "Cheese farm". In 1022, it is mentioned that Vlach ( Aromanian ) shepherds from Thessaly and the Pindus mountains, in modern Greece , provided cheese for Constantinople . Many cheeses popular today were first recorded in the late Middle Ages or after. Cheeses such as Cheddar around 1500, Parmesan in 1597, Gouda in 1697, and Camembert in 1791 show post-Middle Ages dates. In 1546, The Proverbs of John Heywood claimed "

2380-555: The enzymes they produce) also play a large role in the eventual flavor of aged cheeses. Most cheeses are made with starter bacteria from the Lactococcus , Lactobacillus , or Streptococcus genera. Swiss starter cultures include Propionibacterium freudenreichii , which produces propionic acid and carbon dioxide gas bubbles during aging, giving Emmental cheese its holes or eyes . Some fresh cheeses are curdled only by acidity, but most cheeses also use rennet. Rennet sets

2450-534: The Ilchester Cheese Company. The company received farm subsidies from the European Union of € 891,256 between 2001 and 2005. Ilchester do not actually manufacture any cheese from scratch, but specialise in blending a variety of British cheeses with other ingredients, such as beer and fruit . Notable Ilchester cheeses include Applewood , a smoke-flavoured Cheddar cheese , and Five Counties, which

2520-612: The Middle East, the Indian subcontinent , and areas influenced by those cultures. But with the spread, first of European imperialism, and later of Euro-American culture and food, cheese has gradually become known and increasingly popular worldwide. The first factory for the industrial production of cheese opened in Switzerland in 1815, but large-scale production first found real success in the United States. Credit usually goes to Jesse Williams,

2590-539: The archaeological record dates back to 5500 BCE and is found in what is now Kuyavia , Poland, where strainers coated with milk-fat molecules have been found. The earliest evidence of cheesemaking in the Mediterranean dates back to 5200 BCE, on the coast of the Dalmatia region of Croatia . Cheesemaking may have begun independently of this by the pressing and salting of curdled milk to preserve it. Observation that

2660-430: The barrier. Active packaging , on the other hand, employs the use of substances that scavenge, capture, or otherwise render harmless deleterious substances. When moisture content is a mechanism for product degradation, packaging with a low moisture vapor transmission rate and the use of desiccants help keep the moisture in the package within acceptable limits. When oxidation is the primary concern, packaging with

2730-424: The cell dies. On the other hand, 'elevated' temperatures short of these result in increased growth and reproduction; if the organism is harmful, perhaps to dangerous levels. Just as temperature increases speed up reactions, temperature decreases reduce them. Therefore, to make explosives stable for longer periods, or to keep rubber bands springy, or to force bacteria to slow down their growth, they can be cooled. That

2800-405: The cheese has set into a very moist gel. Some soft cheeses are now essentially complete: they are drained, salted, and packaged. For most of the rest, the curd is cut into small cubes. This allows water to drain from the individual pieces of curd. Some hard cheeses are then heated to temperatures in the range of 35–55 °C (95–131 °F). This forces more whey from the cut curd. It also changes

2870-400: The cheese into a strong and rubbery gel compared to the fragile curds produced by acidic coagulation alone. It also allows curdling at a lower acidity—important because flavor-making bacteria are inhibited in high-acidity environments. In general, softer, smaller, fresher cheeses are curdled with a greater proportion of acid to rennet than harder, larger, longer-aged varieties. While rennet

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2940-577: The cheese itself turns from a solid to a viscous liquid. Soft, high-moisture cheeses will melt at around 55 °C (131 °F), while hard, low-moisture cheeses such as Parmesan remain solid until they reach about 82 °C (180 °F). Acid-set cheeses, including halloumi , paneer , some whey cheeses and many varieties of fresh goat cheese , have a protein structure that remains intact at high temperatures. When cooked, these cheeses just get firmer as water evaporates. Some cheeses, like raclette , melt smoothly; many tend to become stringy or suffer from

3010-568: The combined wholesale (including manufacture's) and retail storage systems and still be suitable for issue or use by the end user. Shelf-life is not to be confused with service-life (defined as, A general term used to quantify the average or standard life expectancy of an item or equipment while in use. When a shelf-life item is unpacked and introduced to mission requirements, installed into intended application, or merely left in storage, placed in pre-expended bins, or held as bench stock , shelf-life management stops and service life begins.) Shelf life

3080-494: The curds into a single solid body. A newborn cheese is usually salty yet bland in flavor and, for harder varieties, rubbery in texture. These qualities are sometimes enjoyed— cheese curds are eaten on their own—but normally cheeses are left to rest under controlled conditions. This aging period (also called ripening, or, from the French, affinage ) lasts from a few days to several years. As a cheese ages, microbes and enzymes transform texture and intensify flavor. This transformation

3150-696: The defined quality of a specified proportion of the goods remains acceptable under expected (or specified) conditions of distribution, storage and display. According to the United States Department of Agriculture (USDA), "canned foods are safe indefinitely as long as they are not exposed to freezing temperatures, or temperatures above 90 °F (32.2 °C)". If the cans look okay, they are safe to use. Discard cans that are dented, rusted, or swollen. High-acid canned foods (tomatoes, fruits) will keep their best quality for 12 to 18 months; low-acid canned foods (meats, vegetables) for 2 to 5 years. "Sell by date"

3220-456: The degradation of foods and pharmaceuticals is no exception. The same applies to the breakdown of many chemical explosives into more unstable compounds. Nitroglycerine is notorious. Old explosives are thus more dangerous (i.e. liable to be triggered to explode by very small disturbances, even trivial jiggling) than more recently manufactured explosives. Rubber products also degrade as sulphur bonds induced during vulcanization revert; this

3290-547: The discovery of cheese. Homer 's Odyssey (8th century BCE) describes the monstrous Cyclops making and storing sheep's and goats' milk cheese (translation by Samuel Butler ): We soon reached his cave, but he was out shepherding, so we went inside and took stock of all that we could see. His cheese-racks were loaded with cheeses, and he had more lambs and kids than his pens could hold... When he had so done he sat down and milked his ewes and goats, all in due course, and then let each of them have her own young. He curdled half

3360-783: The effect of making cheese in an animal stomach gave more solid and better-textured curds may have led to the deliberate addition of rennet. Early archeological evidence of Egyptian cheese has been found in Egyptian tomb murals, dating to about 2000 BCE. A 2018 scientific paper stated that the world's oldest cheese, dating to approximately 1200 BCE (3200 years before present), was found in ancient Egyptian tombs. In 2024, even older preserved remnants of cheese were identified on mummies in Xiaohe Cemetery in present-day Xinjiang . The earliest cheeses were likely quite sour and salty, similar in texture to rustic cottage cheese or feta ,

3430-542: The end of a meal before or following dessert, or replacing the last course. The British tradition is to have cheese after dessert, accompanied by sweet wines like Port . In France, cheese is consumed before dessert, with robust red wine. A cheeseboard typically has contrasting cheeses with accompaniments, such as crackers, biscuits, grapes, nuts, celery or chutney . A cheeseboard typically contains four to six cheeses, for example: mature Cheddar or Comté (hard: cow's milk cheeses); Brie or Camembert (soft: cow's milk);

3500-544: The environment or from recycling an earlier batch's whey; the pure cultures meant a more standardized cheese could be produced. Factory-made cheese overtook traditional cheesemaking in the World War II era, and factories have been the source of most cheese in America and Europe ever since. By 2012, cheese was one of the most shoplifted items from supermarkets worldwide. In 2021, world production of cheese from whole cow milk

3570-890: The environment where the cheese ages. These cheeses include soft ripened cheeses such as Brie and Camembert , blue cheeses such as Roquefort , Stilton , Gorgonzola , and rind-washed cheeses such as Limburger . There are many types of cheese, with around 500 different varieties recognized by the International Dairy Federation, more than 400 identified by Walter and Hargrove, more than 500 by Burkhalter, and more than 1,000 by Sandine and Elliker. The varieties may be grouped or classified into types according to criteria such as length of ageing, texture, methods of making, fat content, animal milk, country or region of origin, etc.—with these criteria either being used singly or in combination, but with no single method being universally used. The method most commonly and traditionally used

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3640-403: The fact that oils leach out during the first melting and are gone, leaving the non-meltable solids behind. As its temperature continues to rise, cheese will brown and eventually burn. Browned, partially burned cheese has a particular distinct flavor of its own and is frequently used in cooking (e.g., sprinkling atop items before baking them). A cheeseboard (or cheese course) may be served at

3710-572: The front of the shelf, so that most shoppers will pick them up first and thus they are likely to be sold before the end of their shelf life. Some stores can be fined for selling out of date products; most if not all would have to mark such products down as wasted , resulting in a financial loss. Shelf life depends on the degradation mechanism of the specific product. Most can be influenced by several factors: exposure to light , heat , moisture, transmission of gases , mechanical stresses , and contamination by things such as micro-organisms. Product quality

3780-537: The fungus Mucor miehei , but others have been extracted from Cynara thistles. For a few cheeses, the milk is curdled by adding acids such as vinegar or lemon juice . Cheese is valued for its portability, long shelf life , and high content of fat, protein, calcium , and phosphorus . Cheese is more compact and has a longer shelf life than milk. Hard cheeses , such as Parmesan , last longer than soft cheeses, such as Brie or goat's milk cheese . The long storage life of some cheeses, especially when encased in

3850-530: The highest consumers of cheese in 2014, averaging 25 kg (55 lb) per person per annum. A required step in cheesemaking is to separate the milk into solid curds and liquid whey . Usually this is done by acidifying ( souring ) the milk and adding rennet . The acidification can be accomplished directly by the addition of an acid, such as vinegar, in a few cases ( paneer , queso fresco ). More commonly starter bacteria are employed instead which convert milk sugars into lactic acid . The same bacteria (and

3920-497: The inherent time-temperature sensitivity matrix. Temperature data loggers and time temperature indicators can record the temperature history of a shipment to help estimate their remaining shelf life. According to the USDA , "foods kept frozen continuously are safe indefinitely". Passive barrier packaging can often help control or extend shelf life by blocking the transmission of deleterious substances, like moisture or oxygen, across

3990-551: The liquid whey and pressed into finished cheese. Some cheeses have aromatic molds on the rind, the outer layer, or throughout. Over a thousand types of cheese exist, produced in various countries. Their styles, textures and flavors depend on the origin of the milk (including the animal's diet), whether they have been pasteurised , the butterfat content, the bacteria and mold , the processing, and how long they have been aged . Herbs, spices, or wood smoke may be used as flavoring agents . The yellow-to-red color of many cheeses

4060-462: The loss. The DoD Shelf-Life Program defines shelf-life as The total period of time beginning with the date of manufacture, date of cure (for elastomeric and rubber products only), date of assembly, or date of pack (subsistence only), and terminated by the date by which an item must be used (expiration date) or subjected to inspection, test, restoration, or disposal action; or after inspection/laboratory test/restorative action that an item may remain in

4130-536: The milk and set it aside in wicker strainers. Columella 's De Re Rustica (c. 65 CE) details a cheesemaking process involving rennet coagulation, pressing of the curd, salting, and aging. According to Pliny the Elder , it had become a sophisticated enterprise by the time the Roman Empire came into being. Pliny the Elder also mentions in his writings Caseus Helveticus , a hard Sbrinz -like cheese produced by

4200-509: The moon is made of a green cheese " ( Greene may refer here not to the color, as many now think, but to being new or unaged). Variations on this sentiment were long repeated and NASA exploited this myth for an April Fools' Day spoof announcement in 2006. Until its modern spread along with European culture, cheese was nearly unheard of in east Asian cultures and in the pre-Columbian Americas and had only limited use in sub-Mediterranean Africa, mainly being widespread and popular only in Europe,

4270-414: The outside with dry salt or brine washes. Most cheeses have the salt mixed directly into the curds. Other techniques influence a cheese's texture and flavor. Some examples are: Most cheeses achieve their final shape when the curds are pressed into a mold or form. The harder the cheese, the more pressure is applied. The pressure drives out moisture—the molds are designed to allow water to escape—and unifies

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4340-575: The reconstructed West-Germanic form *kāsī , which in turn is an early borrowing from Latin. The Online Etymological Dictionary states that "cheese" derives from: Old English cyse (West Saxon), cese (Anglian) ... from West Germanic *kasjus (source also of Old Saxon kasi , Old High German chasi , German Käse , Middle Dutch case , Dutch kaas ), from Latin caseus [for] "cheese" (source of Italian cacio , Spanish queso , Irish caise , Welsh caws ). The Online Etymological Dictionary states that

4410-474: The rule of thumb is still mostly applicable. In the case of bacteria and fungi , the reactions needed to feed and reproduce speed up at higher temperatures, up to the point that the proteins and other compounds in their cells themselves begin to break down, or denature , so quickly that they cannot be replaced. This is why high temperatures kill bacteria and other micro-organisms: 'tissue' breakdown reactions reach such rates that they cannot be compensated for and

4480-476: The rule was precisely accurate the required temperature increase would be about 15.8 °C (28.4 °F)), and in any case the rule is only a rough approximation and cannot always be relied on. Chemists often use the more comprehensive Arrhenius equation for better estimations. The same is true, up to a point, of the chemical reactions of living things. They are usually catalyzed by enzymes which change reaction rates, but with no variation in catalytic action,

4550-485: The taste of the finished cheese, affecting both the bacterial culture and the milk chemistry. Cheeses that are heated to the higher temperatures are usually made with thermophilic starter bacteria that survive this step—either Lactobacilli or Streptococci . Salt has roles in cheese besides adding a salty flavor. It preserves cheese from spoiling, draws moisture from the curd, and firms cheese's texture in an interaction with its proteins . Some cheeses are salted from

4620-420: The usual temperatures we encounter. It is often applied in shelf life estimation, sometimes wrongly. There is a widespread impression, for instance in industry, that "triple time" can be simulated in practice by increasing the temperature by 15 °C (27 °F), e.g., storing a product for one month at 35 °C (95 °F) simulates three months at 20 °C (68 °F). This is mathematically incorrect (if

4690-476: The word is of: unknown origin; perhaps from a PIE root *kwat- "to ferment, become sour" (source also of Prakrit chasi "buttermilk;" Old Church Slavonic kvasu "leaven; fermented drink ," kyselu "sour," - kyseti "to turn sour;" Czech kysati "to turn sour, rot;" Sanskrit kvathati "boils, seethes;" Gothic hwaþjan "foam"). When the Romans began to make hard cheeses for their legionaries ' supplies,

4760-511: Was 22.2 million tonnes , with the United States accounting for 28% of the total, followed by Germany, France, Italy and the Netherlands as secondary producers (table). As of 2021, the carbon footprint of a kilogram of cheese ranged from 6 to 12 kg of CO 2 eq , depending on the amount of milk used; accordingly, it is generally lower than beef or lamb, but higher than other foods. France , Iceland, Finland, Denmark and Germany were

4830-554: Was noted for being made mostly from sheep's milk, and some cheeses produced nearby were stated to weigh as much as a thousand pounds each. Goats' milk cheese was a recent taste in Rome, improved over the "medicinal taste" of Gaul 's similar cheeses by smoking . Of cheeses from overseas, Pliny preferred those of Bithynia in Asia Minor. c. 1000, Anglo-Saxons in England named a village by

4900-433: Was traditionally produced via extraction from the inner mucosa of the fourth stomach chamber of slaughtered young, unweaned calves, most rennet used today in cheesemaking is produced recombinantly . The majority of the applied chymosin is retained in the whey and, at most, may be present in cheese in trace quantities. In ripe cheese, the type and provenance of chymosin used in production cannot be determined. At this point,

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