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Bating (leather)
Bating, a technical term used in the tanning industry to denote leather that has been treated with hen or pigeon manure, similar to ''puering'' (see puer) where the leather has been treated with dog excrement, and which treatment, in both cases, was performed on the raw hide prior to tanning in order to render the skins, and the subsequent leather, soft and supple. Today, both practices are obsolete and have been replaced in the tanneries with other natural proteolytic enzymes. Leather processing Since early times, tanners have made use of either dog fæces, or hen and pigeon manure, in one of the early phases of leather treatment to produce a soft leather. A bath solution containing the animal extracts was made and the raw hide inserted and left there for a few days, which activated the bacteria and enzymes that reacted with the collagen in the animal skin to make the leather soft and supple. This step was followed by ''drenching'', a term denoting skins that were thoroughly wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tannery Worker, Fes (3093412250)
{{disambiguation ...
Tanning may refer to: * Tanning (leather), treating animal skins to produce leather * Sun tanning, using the sun to darken pale skin ** Indoor tanning, the use of artificial light in place of the sun ** Sunless tanning, application of a stain or dye to the skin (active ingredient in tanning lotion products is dihydroxyacetone (DHA)). * Physical punishment, metaphorically, such as a severe spanking which leaves clear marks See also * Skin whitening * Tan (color) * Tan (other) *Tannin (other) Tannin usually refers to astringent, bitter chemical compounds naturally occurring in plants, which are used in tanning hides and prominent in the taste of some red wines. It may also refer to: * Tannin, a monster in Levantine mythology See als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otto Röhm
Otto Karl Julius Röhm (; 14 March 1876, Öhringen, Germany – 17 September 1939, Berlin) was one of the founders and a longtime president of the ''Röhm und Haas'' chemical company which became later in the USA the Rohm and Haas (today ''Dow Chemical'') and in Germany the Röhm GmbH (today ''Evonik Degussa''). Life After completion of an apprenticeship as pharmacy assistant he started to study pharmacy at the universities of Munich and Tübingen. As a graduated apothecary he completed his studies in 1901 at Tübingen with a dissertation in chemistry on " Polymerisation products of the acrylic acid". He is named in over 70 patents as inventor or co-inventor. When he died in 1939, his company Röhm GmbH employed 1800 workers and the annual revenues exceeded 22 million Reichsmark. His name is carried by several streets and other public places in Darmstadt, Weiterstadt and Worms. Career After the university he started as a researcher at the Merck company, later he wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mezuzah
A ''mezuzah'' ( he, מְזוּזָה "doorpost"; plural: ''mezuzot'') is a piece of parchment, known as a ''klaf'', contained in a decorative case and inscribed with specific Hebrew verses from the Torah ( and ). These verses consist of the Jewish prayer ''Shema Yisrael'', beginning with the phrase: "Hear, O Israel, the (is) our God, the is One". In mainstream Rabbinic Judaism, a ''mezuzah'' is affixed to the doorpost of Jewish homes to fulfill the mitzvah (Biblical commandment) to "write the words of God on the gates and doorposts of your house" (). Some interpret Jewish law to require a ''mezuzah'' in every doorway in the home except bathrooms (which are not a living space), laundry rooms and closets, if they are too small to qualify as rooms. The ''klaf'' is prepared by a qualified scribe ("'' sofer stam'') who has undergone training, both in studying the relevant religious laws, and in the more practical parts (i.e. carving the quill and practising writing). The verses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sefer Torah
A ( he, סֵפֶר תּוֹרָה; "Book of Torah"; plural: ) or Torah scroll is a handwritten copy of the Torah, meaning the five books of Moses (the first books of the Hebrew Bible). The Torah scroll is mainly used in the ritual of Torah reading during Jewish prayers. At other times, it is stored in the holiest spot within a synagogue, the Torah ark, which is usually an ornate curtained-off cabinet or section of the synagogue built along the wall that most closely faces Jerusalem, the Mizrah, direction Jews face when Jewish prayer, praying. The text of the Torah is also commonly printed and bookbinding, bound in codex, book form for non-ritual functions, called a (plural ) ("five-part", for the five books of Moses), and is often accompanied by commentaries or translations. History The En-Gedi Scroll is an ancient Hebrew parchment found in 1970 at Ein Gedi, Israel. Radiocarbon testing dates the scroll to the third or fourth century CE (210–390 CE), although paleograp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globulin
The globulins are a family of globular proteins that have higher molecular weights than albumins and are insoluble in pure water but dissolve in dilute salt solutions. Some globulins are produced in the liver, while others are made by the immune system. Globulins, albumins, and fibrinogen are the major blood proteins. The normal concentration of globulins in human blood is about 2.6-3.5 g/dL. The term "globulin" is sometimes used synonymously with "globular protein". However, albumins are also globular proteins, but are ''not'' globulins. All other serum globular proteins are globulins. Types of globulins All globulins fall into one of the following three categories : * Alpha globulins * Beta globulins * Gamma globulins (one group of gamma globulins is the immunoglobulins, which are also known as "antibodies") Globulins can be distinguished from one another using serum protein electrophoresis. Globulins exert oncotic pressure. Their deficiency results in loss of carrier fun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumin
Albumin is a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are water-soluble, moderately soluble in concentrated salt solutions, and experience heat denaturation. Albumins are commonly found in blood plasma and differ from other blood proteins in that they are not glycosylated. Substances containing albumins are called ''albuminoids''. A number of blood transport proteins are evolutionarily related in the albumin family, including serum albumin, alpha-fetoprotein, vitamin D-binding protein and afamin. This family is only found in vertebrates. ''Albumins'' in a less strict sense can mean other proteins that coagulate under certain conditions. See for lactalbumin, ovalbumin and plant "2S albumin". Function Albumins in general are transport proteins that bind to various ligands and carry them around. Human types include: * Human serum albumin is the main protein of human blood plasma. It makes up around 50 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elastin
Elastin is a protein that in humans is encoded by the ''ELN'' gene. Elastin is a key component of the extracellular matrix in gnathostomes (jawed vertebrates). It is highly elastic and present in connective tissue allowing many tissues in the body to resume their shape after stretching or contracting. Elastin helps skin to return to its original position when it is poked or pinched. Elastin is also an important load-bearing tissue in the bodies of vertebrates and used in places where mechanical energy is required to be stored. Function The ''ELN'' gene encodes a protein that is one of the two components of elastic fibers. The encoded protein is rich in hydrophobic amino acids such as glycine and proline, which form mobile hydrophobic regions bounded by crosslinks between lysine residues. Multiple transcript variants encoding different isoforms have been found for this gene. Elastin's soluble precursor is tropoelastin. The characterization of disorder is consistent with an ent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Casein
Casein ( , from Latin ''caseus'' "cheese") is a family of related phosphoproteins (CSN1S1, αS1, aS2, CSN2, β, K-casein, κ) that are commonly found in mammalian milk, comprising about 80% of the proteins in cow's milk and between 20% and 60% of the proteins in breast milk, human milk. Sheep's milk, Sheep and buffalo milk have a higher casein content than other types of milk with human milk having a particularly low casein content. Casein has a wide variety of uses, from being a major component of cheese, to use as a food additive. The most common form of casein is sodium caseinate. In milk, casein undergoes phase separation to form colloidal casein micelles, a type of secreted biomolecular condensate. As a food source, casein supplies amino acids, carbohydrates, and two essential elements, calcium and phosphorus. Composition Casein contains a high number of proline amino acids which hinder the formation of common secondary structural motifs of proteins. There are also no di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rabbit
Rabbits, also known as bunnies or bunny rabbits, are small mammals in the family Leporidae (which also contains the hares) of the order Lagomorpha (which also contains the pikas). ''Oryctolagus cuniculus'' includes the European rabbit species and its descendants, the world's 305 breeds of domestic rabbit. ''Sylvilagus'' includes 13 wild rabbit species, among them the seven types of cottontail. The European rabbit, which has been introduced on every continent except Antarctica, is familiar throughout the world as a wild prey animal and as a domesticated form of livestock and pet. With its widespread effect on ecologies and cultures, the rabbit is, in many areas of the world, a part of daily life—as food, clothing, a companion, and a source of artistic inspiration. Although once considered rodents, lagomorphs like rabbits have been discovered to have diverged separately and earlier than their rodent cousins and have a number of traits rodents lack, like two extra incis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirt
Dirt is an unclean matter, especially when in contact with a person's clothes, skin, or possessions. In such cases, they are said to become dirty. Common types of dirt include: * Debris: scattered pieces of waste or remains * Dust: a general powder of organic or mineral matter * Filth: foul matter such as excrement * Grime: a black, ingrained dust such as soot * Soil: the mix of clay, sand, and humus which lies on top of bedrock. The term 'soil' may be used to refer to unwanted substances or dirt that are deposited onto surfaces such as clothing. Exhibitions and studies A season of artworks and exhibits on the theme of dirt was sponsored by the Wellcome Trust in 2011. The centrepiece was an exhibition at the Wellcome Collection showing pictures and histories of notable dirt such as the great dust heaps at Euston and King's Cross in the 19th century and the Fresh Kills landfill which was once the world's largest landfill. Cleaning When things are dirty, they are usuall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deliming
The deliming operation in leather processing is a drum/paddle or pit based operation where two main objectives are met: * Removal of alkali from the pelt and the consequent deswelling of the fibres. * Lowering of the liquor pH to the values used in the bating process. Deliming operations of cattle hides usually last two hours and are generally associated with the alkaline phase of beamhouse operations. The progress of deliming in pelts is monitored by the checking of pH values of process liquors and in the cutting of a pelt cross-section. Phenolphthalein is used to monitor deliming pelt cross-sectional progress. Removal of pelt alkali and deswelling * As an acid is added it lowers the pH value of the internal pelt solution. This neutralizes the solution alkalinity. The lowering of the pH results in rapid protonation of the collagen basic groups. Lowering of liquor pH * The acid present in the deliming agents neutralizes the process liquor pH. Typical values after effective, thor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leather
Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hogs, and aquatic animals such as seals and alligators. Leather can be used to make a variety of items, including clothing, footwear, handbags, furniture, tools and sports equipment, and lasts for decades. Leather making has been practiced for more than 7,000 years and the leading producers of leather today are China and India. Animal rights groups claim that modern commercial leather making and the consumption of its products is unethically killing animals. According to the life-cycle assessment (LCA) report for the United Nations Industrial Development Organization, 99% of the raw hides and skins used in the production of leather derive from animals raised for meat and/or dairy production. Critics of tanneries claim that they engage in uns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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