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Aminotriazole
3-Amino-1,2,4-triazole (3-AT) is a heterocyclic organic compound that consists of 1,2,4-triazole with an amino group as a substituent. 3-AT is a competitive inhibitor of the product of the HIS3 gene, imidazoleglycerol-phosphate dehydratase. Imidazoleglycerol-phosphate dehydratase is an enzyme catalyzing the sixth step of histidine production. 3-AT is also a nonselective systemic triazole herbicide used on nonfood croplands to control annual grasses and broadleaf and aquatic weeds. It is not used on food crops because of its carcinogenic properties. As an herbicide, it is known as ''aminotriazole'', ''amitrole'' or ''amitrol''. Amitrol was included in a biocide ban proposed by the Swedish Chemicals Agency and approved by the European Parliament on January 13, 2009. Amitrol's mode of action is unknown, though it is classed as a resistance group Q herbicide. Applications in microbiology By applying 3-AT to a yeast cell culture which is dependent upon a plasmid containing HIS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cranberry Scare Of 1959
The cranberry scare of 1959 was an American food scare caused by government reports that the cranberry harvest was Food contaminant, contaminated with the herbicide 3-Amino-1,2,4-triazole, aminotriazole. The scare was set off on November 9, 1959, a few weeks before Thanksgiving (United States), Thanksgiving, at a United States Department of Health and Human Services, Department of Health, Education, and Welfare news conference where Arthur Flemming announced that two shipments of cranberries had tested positive for aminotriazole, a possible carcinogen. This was especially disruptive as, at the time, the vast majority of cranberry consumption in the United States happened during the holiday season. Due to the scare, some grocery stores stopped carrying cranberry products and sales of fresh cranberries fell by 73%. Shortly before Thanksgiving many batches of cranberries were certified as aminotriazole-free, but by then many had already made up their minds. Even President Dwight D. E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3-amino-1,2,4-triazole
3-Amino-1,2,4-triazole (3-AT) is a heterocyclic organic compound that consists of 1,2,4-triazole with an amino group as a substituent. 3-AT is a competitive inhibitor of the product of the HIS3 gene, imidazoleglycerol-phosphate dehydratase. Imidazoleglycerol-phosphate dehydratase is an enzyme catalyzing the sixth step of histidine production. 3-AT is also a nonselective systemic triazole herbicide used on nonfood croplands to control annual grasses and broadleaf and aquatic weeds. It is not used on food crops because of its carcinogenic properties. As an herbicide, it is known as ''aminotriazole'', ''amitrole'' or ''amitrol''. Amitrol was included in a biocide ban proposed by the Swedish Chemicals Agency and approved by the European Parliament on January 13, 2009. Amitrol's mode of action is unknown, though it is classed as a resistance group Q herbicide. Applications in microbiology By applying 3-AT to a yeast cell culture which is dependent upon a plasmid containing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Sherwood Flemming
Arthur Sherwood Flemming (June 12, 1905September 7, 1996) was an American government official. He served as the United States Secretary of Health, Education, and Welfare from 1958 until 1961 under President Dwight D. Eisenhower's administration. Flemming was an important force in the shaping of Social Security policy for more than four decades. He also served as president of the University of Oregon, Ohio Wesleyan University, and Macalester College. In 1966, he was elected to a four-year term as president of the National Council of Churches, the leading Christian ecumenical organization in the United States. From 1974 to 1981, he was the chairman of the United States Commission on Civil Rights. Early life and education Flemming was born in Kingston, New York, to Judge Harry Hardwick Flemming and the former Harriet (née Sherwood). Flemming graduated from Ohio Wesleyan University, class of 1927 and a member of the Epsilon chapter of Alpha Sigma Phi fraternity. On December 14, 1934 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annual Plant
An annual plant is a plant that completes its life cycle, from germination to the production of seeds, within one growing season, and then dies. Globally, 6% of all plant species and 15% of herbaceous plants (excluding trees and shrubs) are annuals. The annual life cycle has independently emerged in over 120 different plant families throughout the entire angiosperm phylogeny. The evolutionary and ecological drivers of the annual life cycle Traditionally, there has been a prevailing assumption that annuals have evolved from perennial ancestors. However, recent research challenges this notion, revealing instances where perennials have evolved from annual ancestors. Intriguingly, models propose that transition rates from an annual to a perennial life cycle are twice as fast as the reverse transition. The life-history theory posits that annual plants are favored when adult mortality is higher than seedling (or seed) mortality, i.e., annuals will dominate environments with dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of Health, Education, And Welfare
The United States Department of Health and Human Services (HHS) is a cabinet-level executive branch department of the US federal government created to protect the health of the US people and providing essential human services. Its motto is "Improving the health, safety, and well-being of America". Before the separate federal Department of Education was created in 1979, it was called the Department of Health, Education, and Welfare (HEW). HHS is administered by the secretary of health and human services, who is appointed by the president with the advice and consent of the United States Senate. The United States Public Health Service Commissioned Corps, the uniformed service of the PHS, is led by the surgeon general who is responsible for addressing matters concerning public health as authorized by the secretary or by the assistant secretary for health in addition to his or her primary mission of administering the Commissioned Corps. History Federal Security Agency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selective Media
A growth medium or culture medium is a solid, liquid, or semi-solid designed to support the growth of a population of microorganisms or cells via the process of cell proliferation or small plants like the moss ''Physcomitrella patens''. Different types of media are used for growing different types of cells. The two major types of growth media are those used for cell culture, which use specific cell types derived from plants or animals, and those used for microbiological culture, which are used for growing microorganisms such as bacteria or fungi. The most common growth media for microorganisms are nutrient broths and agar plates; specialized media are sometimes required for microorganism and cell culture growth. Some organisms, termed fastidious organisms, require specialized environments due to complex nutritional requirements. Viruses, for example, are obligate intracellular parasites and require a growth medium containing living cells. Types The most common growth media ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histidine
Histidine (symbol His or H) is an essential amino acid that is used in the biosynthesis of proteins. It contains an Amine, α-amino group (which is in the protonated –NH3+ form under Physiological condition, biological conditions), a carboxylic acid group (which is in the deprotonated –COO− form under biological conditions), and an imidazole side chain (which is partially protonated), classifying it as a positively charged amino acid at physiological pH. Initially thought essential amino acid, essential only for infants, it has now been shown in longer-term studies to be essential for adults also. It is Genetic code, encoded by the Genetic code, codons CAU and CAC. Histidine was first isolated by Albrecht Kossel and Sven Gustaf Hedin in 1896. The name stems from its discovery in tissue, from ''histós'' "tissue". It is also a Precursor (chemistry), precursor to histamine, a vital inflammatory agent in immune responses. The acyl radical (chemistry), radical is histidyl. Pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cell Culture
Cell culture or tissue culture is the process by which cell (biology), cells are grown under controlled conditions, generally outside of their natural environment. After cells of interest have been Cell isolation, isolated from living tissue, they can subsequently be maintained under carefully controlled conditions. They need to be kept at body temperature (37 °C) in an incubator. These conditions vary for each cell type, but generally consist of a suitable vessel with a substrate or rich growth medium, medium that supplies the essential nutrients (amino acids, carbohydrates, vitamins, minerals), growth factors, hormones, and gases (Carbon dioxide, CO2, Oxygen, O2), and regulates the physio-chemical environment (Buffer solution, pH buffer, osmotic pressure, temperature). Most cells require a surface or an artificial substrate to form an adherent culture as a monolayer (one single-cell thick), whereas others can be grown free floating in a medium as a suspension culture. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbicide Resistance Classification
The Herbicide Resistance Action Committee (HRAC) classifies herbicides by their mode of action (MoA) to provide a uniform way for farmers and growers to identify the agents they use and better manage pesticide resistance around the world. It is run by CropLife International in conjunction with the Weed Science Society of America (WSSA). Resistance overview A weed that develops resistance to one herbicide typically has resistance to other herbicides with the same mode of action (MoA), so herbicides with different MoAs, or different resistance groups, are needed. Preventative weed resistance management rotates herbicide types to prevent selective breeding of resistance to the same mode of action. By rotating MoAs, successive generations gain no advantage from any resistant mutations of the last generation. ''Cross-resistant'' and ''multiply resistant'' weeds resist multiple MoAs, and are particularly difficult to control. There is limited evidence of resistance undoing other resis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swedish Chemicals Agency
Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by the Swedish language * Swedish people or Swedes, persons with a Swedish ancestral or ethnic identity ** A national or citizen of Sweden, see demographics of Sweden ** Culture of Sweden * Swedish cuisine See also * * Swedish Church (other) * Swedish Institute (other) * Swedish invasion (other) * Swedish Open (other) Swedish Open is a tennis tournament. Swedish Open may also refer to: * Swedish Open (badminton) * Swedish Open (table tennis) * Swedish Open (squash) * Swedish Open (darts) {{disambiguation ... {{disambig Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biocide
A biocide is defined in the European legislation as a chemical substance or microorganism intended to destroy, deter, render harmless, or exert a controlling effect on any harmful organism. The US Environmental Protection Agency (EPA) uses a slightly different definition for biocides as "a diverse group of poisonous substances including preservatives, insecticides, disinfectants, and pesticides used for the control of organisms that are harmful to human or animal health or that cause damage to natural or manufactured products". When compared, the two definitions roughly imply the same, although the US EPA definition includes plant protection products and some veterinary medicines. The terms "biocides" and "pesticides" are regularly interchanged, and often confused with "plant protection products". To clarify this, pesticides include both biocides and plant protection products, where the former refers to substances for non-food and feed purposes and the latter refers to substances ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carcinogenic
A carcinogen () is any agent that promotes the development of cancer. Carcinogens can include synthetic chemicals, naturally occurring substances, physical agents such as ionizing and non-ionizing radiation, and Biological agent, biologic agents such as viruses and carcinogenic bacteria, bacteria. Most carcinogens act by creating mutations in DNA that disrupt a cell's normal processes for regulating growth, leading to uncontrolled cellular proliferation. This occurs when the cell's DNA repair processes fail to identify DNA damage allowing the defect to be passed down to daughter cells. The damage accumulates over time. This is typically a multi-step process during which the regulatory mechanisms within the cell are gradually dismantled allowing for unchecked Cell division, cellular division. The specific mechanisms for carcinogenic activity is unique to each agent and cell type. Carcinogens can be broadly categorized, however, as activation-dependent and activation-independent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
