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Demeton-S-methyl
Demeton-S-methyl is an organic compound with the molecular formula C6H15O3PS2. It was used as an organothiophosphate acaricide and organothiophosphate insecticide. It is flammable. With prolonged storage, Demeton-S-methyl becomes more toxic due to formation of a sulfonium derivative which has greater affinity to the human form of the acetylcholinesterase enzyme, and this may present a hazard in agricultural use. History Demeton-S-methyl was first described in 1950 by Schrader and was widely adopted as a pesticide because of the lower toxicity to humans than the previously used demeton. In its beginning days, it was mostly used together with demeton-O-methyl in an O:S ratio of 70:30. From 1957 onward, only pure demeton-S-methyl was used. Because of its high toxicity and severe toxic effects to humans, demeton-S-methyl is now classified as a highly toxic substance by the World Health Organization and is banned from agricultural use worldwide. Structure and reactivity Demeton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Demeton
Demeton, sold as an amber oily liquid with a sulphur like odour under the name Systox™, is an organophosphate derivative causing irritability and shortness of breath to individuals repeatedly exposed. It was used as a phosphorothioate insecticide and acaricide and has the chemical formula C8H19O3PS2. Although it was previously used as an insecticide, it is now largely obsolete due to its relatively high toxicity to humans. Demeton consists of two components, demeton-S and demeton-O in a ratio of approximately 2:1 respectively. The chemical structure of demeton is closely related to military nerve agents such as VX and a derivative with one of the ethoxy groups replaced by methyl was investigated by both the US and Soviet chemical-weapons programs under the names V.sub.X and GD-7. History Demeton, under the name Systox™, was introduced by Bayer in 1951. It is the first systemic insecticide. It was used against aphids, thrips, and sawflies in the agriculture sector. Demeton wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Compound
In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry. For historical reasons, a few classes of carbon-containing compounds (e.g., carbonate salts and cyanide salts), along with a few other exceptions (e.g., carbon dioxide, hydrogen cyanide), are not classified as organic compounds and are considered inorganic. Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. Although organic compounds make up only a small percentage of Earth's crust, they are of central importance because all known life is based on organic compounds. Living t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian Journal Of Entomology
''Austral Entomology'' (formerly ''Australian Journal of Entomology'') is a peer-reviewed scientific journal published by Wiley on behalf of the Australian Entomological Society. The editor-in-chief An editor-in-chief (EIC), also known as lead editor or chief editor, is a publication's editorial leader who has final responsibility for its operations and policies. The highest-ranking editor of a publication may also be titled editor, managing ... is Dr Richard V Glatz. Austral Entomology is the flagship publication of the Society, and it promotes the study of the biology, ecology, taxonomy and control of insects and arachnids within a southern hemisphere context. External links * Quarterly journals English-language journals Wiley-Blackwell academic journals Entomology journals and magazines Publications established in 1962 Academic journals associated with learned and professional societies of Australia {{zoo-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obsolete Pesticides
Obsolescence is the state of being which occurs when an object, service, or practice is no longer maintained or required even though it may still be in good working order. It usually happens when something that is more efficient or less risky replaces it. The international standard IEC 62402:2019 Obsolescence Management defines obsolescence as the "transition from available to unavailable from the manufacturer in accordance with the original specification". Obsolete also refers to something that is already disused or discarded, or antiquated. Typically, obsolescence is preceded by a gradual decline in popularity. Consequences Driven by rapid technological changes, new components are developed and launched on the market with increasing speed. The result is a dramatic change in production methods of all components and their market availability. A growing industry sector is facing issues where life cycles of products no longer fit together with life cycles of required components ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemosphere
The Chemosphere is a modernist house in Los Angeles, California, designed by John Lautner in 1960. The building, which the ''Encyclopædia Britannica'' once called "the most modern home built in the world", is admired both for the ingenuity of its solution to the problem of the site and for its unique octagonal design. Design The building stands on the San Fernando Valley side of the Hollywood Hills, just off Mulholland Drive. It is a one-story octagon with around of living space. Most distinctively, the house is perched atop a concrete column nearly high. This innovative design was Lautner's solution to a site that, with a slope of 45 degrees, was thought to be practically unbuildable. Because of a concrete pedestal, almost in diameter, buried under the earth and supporting the column, the house has survived earthquakes and heavy rains. The house is reached by a funicular. Chemosphere is bisected by a central, exposed brick wall with a fireplace, abutted by subdued seatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science Of The Total Environment
''Science of the Total Environment'' is a weekly international peer-reviewed scientific journal covering environmental science. It was established in 1972 and is published by Elsevier. The editors-in-chief are Damià Barceló (Consejo Superior de Investigaciones Científicas), Jay Gan (University of California, Riverside) and Philip Hopke (University of Rochester). According to the ''Journal Citation Reports'', the journal has a 2021 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 10.753. Controversies The October 2020 article suggesting that amulets may prevent COVID-19 has been met with skepticism even among the listed coauthors. As of November 2020, the article was under "temporary removal". It was later withdrawn at the request of the authors. References Ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elsevier BV
Elsevier () is a Dutch academic publishing company specializing in scientific, technical, and medical content. Its products include journals such as ''The Lancet'', ''Cell'', the ScienceDirect collection of electronic journals, '' Trends'', the '' Current Opinion'' series, the online citation database Scopus, the SciVal tool for measuring research performance, the ClinicalKey search engine for clinicians, and the ClinicalPath evidence-based cancer care service. Elsevier's products and services also include digital tools for data management, instruction, research analytics and assessment. Elsevier is part of the RELX Group (known until 2015 as Reed Elsevier), a publicly traded company. According to RELX reports, in 2021 Elsevier published more than 600,000 articles annually in over 2,700 journals; as of 2018 its archives contained over 17 million documents and 40,000 e-books, with over one billion annual downloads. Researchers have criticized Elsevier for its high profit marg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substance Intoxication
Substance intoxication is a transient condition of altered consciousness and behavior associated with recent use of a substance. It is often maladaptive and impairing, but reversible. If the symptoms are severe, the term "substance intoxication delirium" may be used. Substance intoxication may often accompany a substance use disorder (SUD); if persistent substance-related problems exist, SUD is the preferred diagnosis. The term "intoxicated", used by laymen, most often refers to alcohol. Classification The ICD-10 ''Mental and Behavioural Disorders due to psychoactive substance use'' shows: *F10. alcohol *F11. opioids *F12. cannabinoids *F13. sedatives and hypnotics *F14. cocaine *F15. caffeine *F16. hallucinogens *F17. tobacco *F18. volatile solvent *F19. multiple drug use and use of other psychoactive substances Caffeine The discussion over whether the coffee (caffeine) “buzz” counted as intoxication or not was hotly debated during the early to mid 16th century. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analytical Chemistry
Analytical chemistry studies and uses instruments and methods to separate, identify, and quantify matter. In practice, separation, identification or quantification may constitute the entire analysis or be combined with another method. Separation isolates analytes. Qualitative analysis identifies analytes, while quantitative analysis determines the numerical amount or concentration. Analytical chemistry consists of classical, wet chemical methods and modern, instrumental methods. Classical qualitative methods use separations such as precipitation, extraction, and distillation. Identification may be based on differences in color, odor, melting point, boiling point, solubility, radioactivity or reactivity. Classical quantitative analysis uses mass or volume changes to quantify amount. Instrumental methods may be used to separate samples using chromatography, electrophoresis or field flow fractionation. Then qualitative and quantitative analysis can be performed, often with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veterinary And Human Toxicology
Veterinary medicine is the branch of medicine that deals with the prevention, management, diagnosis, and treatment of disease, disorder, and injury in animals. Along with this, it deals with animal rearing, husbandry, breeding, research on nutrition, and product development. The scope of veterinary medicine is wide, covering all animal species, both domesticated and wild, with a wide range of conditions that can affect different species. Veterinary medicine is widely practiced, both with and without professional supervision. Professional care is most often led by a veterinary physician (also known as a veterinarian, veterinary surgeon, or "vet"), but also by paraveterinary workers, such as veterinary nurses or technicians. This can be augmented by other paraprofessionals with specific specialties, such as animal physiotherapy or dentistry, and species-relevant roles such as farriers. Veterinary science helps human health through the monitoring and control of zoonotic disease ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Lancet
''The Lancet'' is a weekly peer-reviewed general medical journal and one of the oldest of its kind. It is also the world's highest-impact academic journal. It was founded in England in 1823. The journal publishes original research articles, review articles ("seminars" and "reviews"), editorials, book reviews, correspondence, as well as news features and case reports. ''The Lancet'' has been owned by Elsevier since 1991, and its editor-in-chief since 1995 has been Richard Horton. The journal has editorial offices in London, New York City, and Beijing. History ''The Lancet'' was founded in 1823 by Thomas Wakley, an English surgeon who named it after the surgical instrument called a lancet (scalpel). Members of the Wakley family retained editorship of the journal until 1908. In 1921, ''The Lancet'' was acquired by Hodder & Stoughton. Elsevier acquired ''The Lancet'' from Hodder & Stoughton in 1991. Impact According to the ''Journal Citation Reports'', the journal has a 202 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
