The Ames test is a widely employed method that uses bacteria to test whether a given chemical can cause mutations in the DNA of the test organism. More formally, it is a biological assay to assess the mutagenic potential of chemical compounds. A positive test indicates that the chemical is mutagenic and therefore may act as a carcinogen, because cancer is often linked to mutation. The test serves as a quick and convenient assay to estimate the carcinogenic potential of a compound because standard carcinogen assays on mice and rats are time-consuming and expensive. However, false-positives and false-negatives are known.
Agar, or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from "ogonori" (Gracilaria) and "tengusa" (Gelidiaceae). As found in nature, agar is a mixture of two components, the linear polysaccharide agarose and a heterogeneous mixture of smaller molecules called agaropectin. It forms the supporting structure in the cell walls of certain species of algae and is released on boiling. These algae are known as agarophytes, belonging to the Rhodophyta phylum. The processing of food-grade agar removes the agaropectin, and the commercial product is essentially pure agarose.
Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt.
Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio frequency (RF) spectrum, and audio, collectively known as stealth technology. The F-117 Nighthawk was the first operational aircraft specifically designed around stealth technology. Other examples of stealth aircraft include the B-2 Spirit, the B-21 Raider, the F-22 Raptor, the F-35 Lightning II, the Chengdu J-20, and the Sukhoi Su-57.
Starburst is the brand name of a box-shaped, fruit-flavoured soft taffy candy manufactured by The Wrigley Company, which today is a subsidiary of Mars, Incorporated. Starburst has many different varieties, such as Tropical, Sour, FaveREDs, Watermelon, Very Berry, Superfruit, Summer Blast and Original.
Coliform bacteria are defined as either motile or non-motile Gram-negative non-spore forming Bacilli that possess β-galactosidase to produce acids and gases under their optimal growth temperature of 35-37°C. They can be aerobes or facultative aerobes, and are a commonly used indicator of low sanitary quality of foods, milk, and water. Coliforms can be found in the aquatic environment, in soil and on vegetation; they are universally present in large numbers in the feces of warm-blooded animals as they are known to inhabit the gastrointestinal system. While coliform bacteria are not normally causes of serious illness, they are easy to culture, and their presence is used to infer that other pathogenic organisms of fecal origin may be present in a sample, or that said sample is not safe to consume. Such pathogens include disease-causing bacteria, viruses, or protozoa and many multicellular parasites.
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.
John George Agar Jr. was an American film and television actor. He is best known for starring alongside John Wayne in the films Sands of Iwo Jima, Fort Apache, and She Wore a Yellow Ribbon. In his later career he was the star of B movies, such as Tarantula!, The Mole People, The Brain from Planet Arous, Revenge of the Creature, Flesh and the Spur and Hand of Death. He was the first husband of Shirley Temple.
I-58, later I-158, was an Imperial Japanese Navy Kaidai-class cruiser submarine of the KD3A sub-class commissioned in 1928. During World War II, she supported Japanese forces during the invasion of Malaya in December 1941 and was instrumental in tracking Force Z, the two British capital ships that attempted to intercept the Japanese invasion forces, so they could be sunk by torpedo bombers. She sank four Dutch merchant ships in early 1942 during the Dutch East Indies campaign and then was transferred to the Central Pacific in May 1942 to support the fleet during the Battle of Midway in early June 1942. Upon her return to Japan in July 1942, she became a training ship until early 1945 when she was modified to serve as a carrier for kaiten manned suicide attack torpedoes. She surrendered to the Allies at the end of the war and was scuttled in 1946.
Bile Esculin Agar (BEA) is a selective differential agar used to isolate and identify members of the genus Enterococcus, formerly part of the "group D streptococci".
German submarine U-96 was a Type VIIC U-boat of the German Navy (Kriegsmarine) during World War II. It was made famous after the war in Lothar-Günther Buchheim's 1973 bestselling novel Das Boot and the 1981 Oscar-nominated film adaptation of the same name, both based on his experience on the submarine as a war correspondent in 1941.
Microbial art, agar art, or germ art is artwork created by culturing microorganisms in certain patterns. The microbes used can be bacteria, yeast, fungi, or less commonly, protists. The microbes can be chosen for their natural colours, or can be engineered to express fluorescent proteins and viewed under ultraviolet light to make them fluoresce in colour.
Mueller Hinton agar is a type of growth medium used in microbiology to culture bacterial isolates and test their susceptibility to antibiotics. This medium was first developed in 1941 by John Howard Mueller and Jane Hinton, who were microbiologists working at Harvard University. However, Mueller Hinton agar is made up of a couple of components, including beef extract, acid hydrolysate of casein, and starch, as well as agar to solidify the mixture. Meanwhile, The composition of Mueller Hinton agar can vary depending on the manufacturer and the intended use, but the medium is generally nutrient-rich and free of inhibitors that could interfere with bacterial growth.
Trichophyton tonsurans is a fungus in the family Arthrodermataceae that causes ringworm infection of the scalp. It was first recognized by David Gruby in 1844. Isolates are characterized as the "–" or negative mating type of the Arthroderma vanbreuseghemii complex. This species is thought to be conspecific with T. equinum, although the latter represents the "+" mating strain of the same biological species Despite their biological conspecificity, clones of the two mating types appear to have undergone evolutionary divergence with isolates of the T. tonsurans-type consistently associated with Tinea capitis whereas the T. equinum-type, as its name implies, is associated with horses as a regular host. Phylogenetic relationships were established in isolates from Northern Brazil, through fingerprinting polymorphic RAPD and M13 markers. There seems to be lower genomic variability in the T. tonsurans species due to allopatric divergence. Any phenotypic density is likely due to environmental factors, not genetic characteristics of the fungus.
SS Navemar was a cargo steamship that was built in England in 1921, was Norwegian-owned until 1927 and then Spanish-owned for the rest of her career. An Italian submarine sank her in the Strait of Gibraltar in 1942.
Opal is a contactless fare collection system for public transport services in the greater Sydney area and most other urban areas of New South Wales, Australia. Operation of the Opal system is managed by the New South Wales Government's transport authority, Transport for NSW. First launched in late 2012, Opal is valid on Transport for NSW's metro, train, bus, ferry and light rail services that operate in Sydney and the neighbouring Central Coast, Hunter Region, Blue Mountains, Illawarra and Southern Highlands areas. Opal equipment was designed from the start to support a variety of cards, but launched with the captive Opal cards.
Tessa Rose Lavey is an Australian professional basketball player for the Bendigo Spirit of the Women's National Basketball League (WNBL) and an Australian rules football player with the Richmond Football Club in the AFL Women's competition (AFLW).
Cannabis drug testing describes various drug test methodologies for the use of cannabis in medicine, sport, and law. Cannabis use is highly detectable and can be detected by urinalysis, hair analysis, as well as saliva tests for days or weeks.
opal® is the brand name for apple cultivar 'UEB 32642'. The variety originates from a natural crossing of 'Golden Delicious' with 'Topaz'.
Genspace is a non-profit organization and a community biology laboratory located in Brooklyn, New York. Stemming from the hacking, biohacking, and DIYbio movements, Genspace has focused on supporting citizen science and public access to biotechnology. Genspace opened a Biosafety Level One laboratory in December 2010. Since its opening, Genspace has supported projects, events, courses, art, and general community resources concerning biology, biotechnology, synthetic biology, genetic engineering, citizen science, open source software, open source hardware, and more.
