|
Millipore Corporation
Merck Millipore was the brand used by Merck Group's (not US-based Merck & Co.) global life science business until 2015 when the company re-branded. It was formed when Merck acquired the Millipore Corporation in 2010. Merck is a supplier to the life science industry. The Millipore Corporation was founded in 1954, and listed among the S&P 500 since the early 1990s, as an international biosciences company which makes micrometer pore-size filters and tests. In 2015, Merck acquired Sigma-Aldrich and merged it with Merck Millipore. In the United States and Canada, the life science business is now known as MilliporeSigma. History Founding In the early 1950s, Lovell Corporation won a contract from the U.S. Army Chemical Engineers to develop and manufacture membrane filtering devices used to separate the molecular components of fluid samples. When the membranes were declassified in 1953 and offered for commercial use, Jack Bush, son of Vannevar Bush and a Lovell employee, bought the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Privately Held Company
A privately held company (or simply a private company) is a company whose Stock, shares and related rights or obligations are not offered for public subscription or publicly negotiated in their respective listed markets. Instead, the Private equity, company's stock is offered, owned, traded or exchanged privately, also known as "over-the-counter (finance), over-the-counter". Related terms are unlisted organisation, unquoted company and private equity. Private companies are often less well-known than their public company, publicly traded counterparts but still have major importance in the world's economy. For example, in 2008, the 441 list of largest private non-governmental companies by revenue, largest private companies in the United States accounted for $1.8 trillion in revenues and employed 6.2 million people, according to ''Forbes''. In general, all companies that are not owned by the government are classified as private enterprises. This definition encompasses both publ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ester
In chemistry, an ester is a compound derived from an acid (either organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group () of that acid is replaced by an organyl group (R). These compounds contain a distinctive functional group. Analogues derived from oxygen replaced by other chalcogens belong to the ester category as well. According to some authors, organyl derivatives of acidic hydrogen of other acids are esters as well (e.g. amides), but not according to the IUPAC. Glycerides are fatty acid esters of glycerol; they are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. Lactones are cyclic carboxylic esters; naturally occurring lactones are mainly 5- and 6-membered ring lactones. Lactones contribute to the aroma of fruits, butter, cheese, vegetables like celery and other foods. Esters can be formed from oxoacids (e.g. esters of acetic acid, carbonic acid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syringe Filter
A syringe filter (sometimes called a wheel filter if it has a wheel-like shape) is a single-use filter cartridge. It is attached to the end of a syringe for use. Syringe filters may have Luer lock fittings, though not universally so. The use of a needle is optional; where desired it may be fitted to the end of the syringe filter. A syringe filter generally consists of a plastic housing with a membrane that serves as a filter. The fluid to be purified may be cleaned only by being pushed through the filter from syringe, it cannot be drawn into the syringe through the filter due to its one way process. Forms In scientific applications, the most common sizes available are 0.2 or 0.22 micrometre, μm and 0.45 μm pores. These sizes are sufficient for High-performance liquid chromatography, HPLC use. The smallest known sterile syringe microfilter have pore sizes of 0.02 μm. Membrane diameters of 10 mm, 13 mm, 25 mm are common as well. Some syringe filter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nylon
Nylon is a family of synthetic polymers characterised by amide linkages, typically connecting aliphatic or Polyamide#Classification, semi-aromatic groups. Nylons are generally brownish in color and can possess a soft texture, with some varieties exhibiting a silk-like appearance. As Thermoplastic, thermoplastics, nylons can be melt-processed into fibres, Thin film, films, and diverse shapes. The properties of nylons are often modified by blending with a variety of additives. Numerous types of nylon are available. One family, designated nylon-XY, is derived from diamines and dicarboxylic acids of carbon chain lengths X and Y, respectively. An important example is nylon-6,6 (). Another family, designated nylon-Z, is derived from amino acid, aminocarboxylic acids with carbon chain length Z. An example is nylon-[6]. Nylon polymers have extensive commercial applications, including uses in textiles and fibres (such as apparel, flooring and rubber reinforcement), molded components fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cork (city)
Cork ( ; from , meaning 'marsh') is the second-largest city in Republic of Ireland, Ireland, the county town of County Cork, the largest city in the Provinces of Ireland, province of Munster and the List of settlements on the island of Ireland by population, third largest on the island of Ireland. At the 2022 census of Ireland, 2022 census, it had a population of 224,004. The city centre is an island between two channels of the River Lee (Ireland), River Lee which meet downstream at its eastern end, where the quays and Dock (maritime), docks along the river lead outwards towards Lough Mahon and Cork Harbour, one of the largest natural harbours in the world. Cork was founded in the 6th century as a monastic settlement, and was expanded by Vikings, Viking invaders around 915. Its charter was granted by John, King of England, Prince John in 1185 in Ireland, 1185. Cork city was once fully walled, and the remnants of the old medieval town centre can be found around South and North M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molsheim
Molsheim (; ) is a Communes of France, commune and a Subprefectures in France, subprefecture in the Bas-Rhin Departments of France, department in Grand Est in north-eastern France.Commune de Molsheim (67300) INSEE The total population in 2017 was 9,312. Molsheim had been a very fast-growing city between the French censuses of 1968 and 1999, passing from 5,739 to 9,335 inhabitants, but this increase came to a noticeable halt since. The urban unit of Molsheim had 26,925 inhabitants in 2017, from 16,888 in 1968. Molsheim is part of the functional area (France), metropolitan area of Strasbourg. Cityscape The old town of Molsheim is well preserved and contains a considerable number of old houses and buildings of typically Alsatian architecture. The ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaffrey, New Hampshire
Jaffrey is a town in Cheshire County, New Hampshire, United States. The population was 5,320 at the 2020 census. The main village in town, where 3,058 people resided at the 2020 census, is defined as the Jaffrey census-designated place (CDP) and is located along the Contoocook River at the junction of U.S. Route 202 and New Hampshire routes 124 and 137. History First granted by the Massachusetts General Court in 1736 to soldiers from Rowley, Massachusetts, returning from the war in Canada, the town was known as "Rowley-Canada". In 1749, the town was re-chartered by the Mason proprietors as "Monadnock No. 2", sometimes called "Middle Monadnock" or "Middletown". It was one of the first towns established following the Masonian proprietors' purchase of undivided lands under the claim. Settled about 1758, the town was regranted in 1767. It was incorporated in 1773 by Governor John Wentworth and named for George Jaffrey, member of a wealthy Portsmouth family. Jaffrey's son ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polypropylene
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer Propene, propylene. Polypropylene belongs to the group of polyolefins and is Crystallization of polymers#Degree of crystallinity, partially crystalline and Chemical polarity#Nonpolar molecules, non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat-resistant. It is a white, mechanically rugged material and has a high chemical resistance. Polypropylene is the second-most widely produced Commodity plastics, commodity plastic (after polyethylene). History Phillips Petroleum chemists J. Paul Hogan and Robert Banks (chemist), Robert Banks first demonstrated the polymerization of propylene in 1951. The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. This pioneering discovery led to large-scale commercial producti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyvinylidene Fluoride
Polyvinylidene fluoride or polyvinylidene difluoride (PVDF) is a highly non-reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride. Its chemical formula is (C2H2F2)''n''. PVDF is a specialty plastic used in applications requiring the highest purity, as well as resistance to solvents, acids and hydrocarbons. PVDF has low density 1.78 g/cm3 in comparison to other fluoropolymers, like polytetrafluoroethylene. It is available in the form of piping products, sheet, tubing, films, plate and an insulator for premium wire. It can be injected, molded or welded and is commonly used in the chemical, semiconductor, medical and defense industries, as well as in lithium-ion batteries. It is also available as a cross-linked closed-cell foam, used increasingly in aviation and aerospace applications, and as an exotic 3D printer filament. It can also be used in repeated contact with food products, as it is FDA-compliant and non-toxic below its de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porosity
Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam). There are many ways to test porosity in a substance or part, such as industrial CT scanning. The term porosity is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, petrophysics, hydrology, earth sciences, soil mechanics, rock mechanics, and engineering. Void fraction in two-phase flow In gas-liquid two-phase flow, the void fraction is defined as the fraction of the flow-channel volume that is occupied by the gas phase or, alternatively, as the fraction of the cross-sectional area of the channel that is occupied by the gas phase. Void fraction usually varies from location to l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nucleopore Filter
A nuclepore filter (brand name Nuclepore from Whatman, part of GE Healthcare) is a kind of filter in which holes a few micrometres in size have been created in a plastic (e.g. polycarbonate) membrane. These filters are generally created by exposing the membrane to radiation that weakens the plastic and creates specific areas that can be removed by dousing the membrane in acid (or other chemicals). The techniqueR. L. Fleischer, P. Buford Price, and Robert M. Walker (1975) ''Nuclear Tracks in Solids'' (U. California Press, Berkeley). and patent were developed by Robert L. Fleischer, P. Buford Price, and Robert M. Walker as an outgrowth of their research on radiation effects in solids, with a special focus on materials exposed to energetic particles in space. The technique allows for creating uniform holes of any desired diameter to allow even a virus to be filtered. The most common use of Nuclepore filters is in microbiology where they are used to trap cells while removing all o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Membrane
A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Membranes can be generally classified into synthetic membranes and biological membranes. Biological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucous membrane, mucosae and serous membrane, serosae. Synthetic membranes are made by humans for use in laboratory, laboratories and industry (such as chemical plants). This concept of a membrane has been known since the eighteenth century but was used little outside of the laboratory until the end of World War II. Drinking water supplies in Europe had been compromised by The War and membrane filters were used to test for water safety. However, due to the lack of reliability, slow operation, reduced selectivity and elevated costs, membran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
