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In toxicology, the median lethal dose, LD50 (abbreviation for "lethal dose, 50%"), LC50 (lethal concentration, 50%) or LCt50 is a toxic unit that measures the lethal dose of a given substance. The value of LD50 for a substance is the dose required to kill half the members of a tested population after a specified test duration. LD50 figures are frequently used as a general indicator of a substance's acute toxicity. A lower LD50 is indicative of higher toxicity.
In computer science, radix sort is a non-comparative sorting algorithm. It avoids comparison by creating and distributing elements into buckets according to their radix. For elements with more than one significant digit, this bucketing process is repeated for each digit, while preserving the ordering of the prior step, until all digits have been considered. For this reason, radix sort has also been called bucket sort and digital sort.
Ribitol, or adonitol, is a crystalline pentose alcohol (C5H12O5) formed by the reduction of ribose. It occurs naturally in the plant Adonis vernalis as well as in the cell walls of some Gram-positive bacteria, in the form of ribitol phosphate, in teichoic acids. It also forms part of the chemical structure of riboflavin and flavin mononucleotide (FMN), which is a nucleotide coenzyme used by many enzymes, the so-called flavoproteins.
In mathematical analysis and computer science, functions which are Z-order, Lebesgue curve, Morton space-filling curve, Morton order or Morton code map multidimensional data to one dimension while preserving locality of the data points. It is named in France after Henri Lebesgue, who studied it in 1904, and named in the United States after Guy Macdonald Morton, who first applied the order to file sequencing in 1966. The z-value of a point in multidimensions is simply calculated by interleaving the binary representations of its coordinate values. Once the data are sorted into this ordering, any one-dimensional data structure can be used, such as simple one dimensional arrays, binary search trees, B-trees, skip lists or hash tables. The resulting ordering can equivalently be described as the order one would get from a depth-first traversal of a quadtree or octree.
Stafford Municipal School District (SMSD) is a school district based in Stafford, Texas, United States in Greater Houston. The district covers all of the city of Stafford and is controlled by the city, making it the only school district in Texas that is not an independent school district operated by an independent school board.
Dodecanol, or lauryl alcohol, is an organic compound produced industrially from palm kernel oil or coconut oil. It is a fatty alcohol. Sulfate esters of lauryl alcohol, especially sodium lauryl sulfate, are very widely used as surfactants. Sodium lauryl sulfate, ammonium lauryl sulfate, and sodium laureth sulfate are all used in shampoos. Lauryl alcohol is tasteless and colorless with a floral odor.
Microsoft Diagnostics (MSD) was a software tool developed by Microsoft to assist in the diagnostics of 1990s-era computers. Users primarily deployed this tool to provide detailed technical information about the user's software and hardware and to print the gathered information, usually for use by support technicians in troubleshooting and resolving problems. The assumptions made by the program were valid until the late 1990s: it does not handle plug-and-play USB or other new technologies that appeared around 2000.
The Maryland School for the Deaf (MSD) offers public education at no cost to deaf and hard-of-hearing Maryland residents between the ages of zero and 21. It has two campuses located in Frederick and Columbia, Maryland.
This page provides supplementary chemical data on Menthol.
International Chemical Safety Cards (ICSC) are data sheets intended to provide essential safety and health information on chemicals in a clear and concise way. The primary aim of the Cards is to promote the safe use of chemicals in the workplace and the main target users are therefore workers and those responsible for occupational safety and health. The ICSC project is a joint venture between the World Health Organization (WHO) and the International Labour Organization (ILO) with the cooperation of the European Commission (EC). This project began during the 1980s with the objective of developing a product to disseminate the appropriate hazard information on chemicals at the workplace in an understandable and precise way.
Soyuz TMA-9 was a Soyuz mission to the International Space Station (ISS) launched by a Soyuz FG launch vehicle. It was a human spaceflight mission transporting personnel to and from the ISS. It launched from the Baikonur Cosmodrome on 18 September 2006 at 08:09 MSD, docked with the ISS at 09:21 MSD on 20 September, and returned to Earth on 21 April 2007. Soyuz TMA-9 transported two-thirds of ISS Expedition 14 to the space station along with one "spaceflight participant" who performed several experiments on behalf of the European Space Agency.
Resmethrin is a pyrethroid insecticide with many uses, including control of the adult mosquito population.
Silver oxalate is commonly employed in experimental petrology to add carbon dioxide to experiments as it will break down to silver (Ag) and carbon dioxide under geologic conditions. It is also a precursor to the production of silver nanoparticles. It is explosive upon heating around 140 degrees Celsius, shock or friction.
Musculoskeletal disorders (MSDs) are injuries or pain in the human musculoskeletal system, including the joints, ligaments, muscles, nerves, tendons, and structures that support limbs, neck and back. MSDs can arise from a sudden exertion, or they can arise from making the same motions repeatedly repetitive strain, or from repeated exposure to force, vibration, or awkward posture. Injuries and pain in the musculoskeletal system caused by acute traumatic events like a car accident or fall are not considered musculoskeletal disorders. MSDs can affect many different parts of the body including upper and lower back, neck, shoulders and extremities. Examples of MSDs include carpal tunnel syndrome, epicondylitis, tendinitis, back pain, tension neck syndrome, and hand-arm vibration syndrome.
The Ministry of Social Development (MSD) (Māori: Te Manatū Whakahiato Ora) is the public service department of New Zealand charged with advising the government on social policy, and providing social services.
Vinyl fluoride is an organic halide with the chemical formula C2H3F. It is a colorless gas with a faint ether-like odor. It is used as the monomeric precursor to the fluoropolymer polyvinylfluoride.
Hydramethylnon is an organofluorine compound. It is also known as AC 217,300. It is in a chemical class called trifluoromethyl aminohydrazone, which is a metabolic inhibitor. It is classified as a pesticide designed to control insects that are harmful to humans. It works by inhibiting complex III in the mitochondrial inner membrane and leads to a halting of oxidative phosphorylation. It is used primarily as an insecticide in the form of baits for cockroaches and ants. Some brands of insecticides that include hydramethylnon are Amdro, Blatex, Combat, Cyaforce, Cyclon, Faslane, Grant's, Impact, Matox, Maxforce, Pyramdron, Siege, Scuttle and Wipeout. Hydramethylnon is a slow-acting poison with delayed toxicity that needs to be eaten to be effective.
Decanal is an organic compound classified as an aldehyde with the chemical formula C10H20O.
Ariel 5 was a joint British and American space telescope dedicated to observing the sky in the X-ray band. It was launched on 15 October 1974 from the San Marco platform in the Indian Ocean and operated until 1980. It was the penultimate satellite to be launched as part of the Ariel programme.
MSDSonline is a private company that creates programs designed to organize material safety data sheets for other businesses.