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BTB In Boar '', British children's television series
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BTB may refer to: In biology: * Blood–testis barrier in testicular anatomy * Blood–thymus barrier * Bovine tuberculosis or ''Mycobacterium bovis'', a disease originating in cattle * Breakthrough bleeding, of the menstrual period * Bromothymol blue, a chemical indicator for weak acids and bases * BTB/POZ domain, a protein domain In other uses: *Belgian Union of Transport Workers, a trade union in Belgium *Branch target buffer, a computer processor element *Bétou Airport, in the Republic of the Congo (IATA airport code: BTB) *Basil Temple Blackwood (1870–1917), British book illustrator (credited as B.T.B.) *''Bob the Builder ''Bob the Builder'' is a British animated children's television series created by Keith Chapman for HIT Entertainment and Hot Animation. The series follows the adventures of Bob, a building contractor, specialising in masonry, along with hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blood–testis Barrier
The blood–testis barrier is a physical barrier between the blood vessels and the seminiferous tubules of the animal testicle, testes. The name "blood-testis barrier" is misleading in that it is not a blood-organ barrier in a strict sense, but is formed between Sertoli cells of the seminiferous tubule and as such isolates the further developed stages of germ cells from the blood. A more correct term is the "Sertoli cell barrier" (SCB). Structure The walls of seminiferous tubules are lined with primitive germ layer cells and by Sertoli cells. The barrier is formed by tight junctions, adherens junctions and gap junctions between the Sertoli cells, which are sustentacular cells (supporting cells) of the seminiferous tubules, and divides the seminiferous tubule into a basal compartment (outer side of the tubule, in contact with blood and lymph) and an endoluminal compartment (inner side of the tubule, isolated from blood and lymph). The tight junctions are formed by intercellular adhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blood–thymus Barrier
The blood–thymus barrier regulates exchange of substances between the circulatory system and thymus, providing a sequestered environment for immature T cells to develop. The barrier also prevents the immature T cells from contacting foreign antigens (since contact with antigens at this stage will cause the T cells to die by apoptosis). The barrier is formed by the continuous blood capillaries in the thymic cortex, reinforced by type 1 epithelial reticular cells (sometimes called thymic epithelial cells) and macrophages Macrophages (abbreviated as M φ, MΦ or MP) ( el, large eaters, from Greek ''μακρός'' (') = large, ''φαγεῖν'' (') = to eat) are a type of white blood cell of the immune system that engulfs and digests pathogens, such as cancer ce .... The existence of this barrier was first proposed in 1961 and demonstrated to exist in mice in 1963. See also * * * * * References {{DEFAULTSORT:Blood-thymus barrier Thorax (human anatomy) Organs ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mycobacterium Bovis
''Mycobacterium bovis'' is a slow-growing (16- to 20-hour generation time) aerobic bacterium and the causative agent of tuberculosis in cattle (known as bovine TB). It is related to ''Mycobacterium tuberculosis'', the bacterium which causes tuberculosis in humans. ''M. bovis'' can jump the species barrier and cause tuberculosis-like infection in humans and other mammals. Bacterium morphology and staining The bacteria are curved or straight rods. They sometimes form filaments, which fragment into bacilli or cocci once disturbed. In tissues they form slender rods, straight or curved, or club-shaped. Short, relatively plump bacilli (rods) in tissue smears, large slender beaded rods in culture. They have no flagella or fimbria, and no capsule. ''Mycobacterium tuberculosis'' group bacteria are 1.0-4.0 µm long by 0.2-0.3 µm wide in tissues. In culture, they may appear as cocci, or as bacilli up to 6-8 µm long. The bacteria stain Gram-positive, acid-fast. The c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breakthrough Bleeding
Intermenstrual bleeding, previously known as metrorrhagia, is uterine bleeding at irregular intervals, particularly between the expected menstrual periods. It is a cause of vaginal bleeding. In some women, menstrual spotting between periods occurs as a normal and harmless part of ovulation. Some women experience acute mid-cycle abdominal pain around the time of ovulation (sometimes referred to by the German term for this phenomenon, ''mittelschmerz''). This may also occur at the same time as menstrual spotting. The term breakthrough bleeding or breakthrough spotting is usually used for women using hormonal contraceptives, such as IUDs or oral contraceptives, in which it refers to bleeding or spotting between any expected withdrawal bleedings, or bleeding or spotting at any time if none is expected. If spotting continues beyond the first 3-4 cycles of oral contraceptive use, a woman should have her prescription adjusted to a pill containing higher estrogen:progesterone ratio by e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bromothymol Blue
Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid. It is typically sold in solid form as the sodium salt of the acid indicator. Structure and properties Bromothymol blue acts as a weak acid in a solution. It can thus be in protonated or deprotonated form, appearing yellow or blue, respectively. It is bright aquamarine by itself, and greenish-blue in a neutral solution. The deprotonation of the neutral form results in a highly conjugated structure, accounting for the difference in color. An intermediate of the deprotonation mechanism is responsible for the greenish color in neutral solution. The protonated form of bromothymol blue has its peak absorption at 427 nm thus transmitting yellow light in acidic solutions, and the deprotonated form has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BTB/POZ Domain
The BTB/POZ domain is a common structural domain contained within some proteins. The BTB (for BR-C, ttk and bab) or POZ (for Pox virus and Zinc finger) domain is present near the N-terminus of a fraction of zinc finger proteins and in proteins that contain the Kelch motif and a family of pox virus proteins. The BTB/POZ domain mediates homomeric dimerisation and in some instances heteromeric dimerisation. The structure of the dimerised PLZF BTB/POZ domain has been solved and consists of a tightly intertwined homodimer. The central scaffolding of the protein is made up of a cluster of alpha-helices flanked by short beta-sheets at both the top and bottom of the molecule. BTB/POZ domains from several zinc finger proteins have been shown to mediate transcriptional repression and to interact with components of histone deacetylase Histone deacetylases (, HDAC) are a class of enzymes that remove acetyl groups (O=C-CH3) from an ε-N-acetyl lysine amino acid on a histone, allowing the hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belgian Union Of Transport Workers
The Belgian Union of Transport Workers ( nl, Belgische Transportbond, BTB; french: Union Belge du Transport, UBT) is a trade union representing transport workers in Belgium. History The union was founded on 6 June 1913, with the merger of numerous local port, sailors' and transport workers' unions, giving it an initial membership of 8,000. During World War I, the union was largely inactive, but it was revived in 1919, and created a new section for ships' stewards. The union was successful in the early 1920s, and in 1925 was able to fund the construction of a sanatorium, De Mick. It took part in a major strike at the port in Antwerp in 1928, and then in the Belgian general strike of 1936. During World War II, the union was forced to stop activity in the Netherlands, but a few leaders including Omer Becu escaped to the United Kingdom and were able to keep the union running from there. In 1947, the Belgian Union of Tramway and Municipal Transport Workers merged into the union, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Branch Target Buffer
In computer architecture, a branch target predictor is the part of a processor that predicts the target of a taken conditional branch or an unconditional branch instruction before the target of the branch instruction is computed by the execution unit of the processor. Branch target prediction is not the same as branch prediction which attempts to guess whether a conditional branch will be taken or not-taken (i.e., binary). In more parallel processor designs, as the instruction cache latency grows longer and the fetch width grows wider, branch target extraction becomes a bottleneck. The recurrence is: * Instruction cache fetches block of instructions * Instructions in block are scanned to identify branches * First predicted taken branch is identified * Target of that branch is computed * Instruction fetch restarts at branch target In machines where this recurrence takes two cycles, the machine loses one full cycle of fetch after every predicted taken branch. As predicted b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bétou Airport
Bétou Airport is an airport within the town of Bétou in the Likouala Department, Republic of the Congo. The runway also serves as part of the road leading westward out of town. Bétou is on the Ubangi River, the border with the Democratic Republic of the Congo. East approach and departure will cross the river into the DRC. See also * * * List of airports in the Republic of the Congo * Transport in the Republic of the Congo Transport in the Republic of Congo includes land, air and water modes. Over of paved roads are in use. The two international airports are Maya-Maya Airport and Pointe Noire Airport. The country also has a large port on the Atlantic Ocean at ... References External linksOpenStreetMap - Bétou [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basil Temple Blackwood
Lord Ian Basil Gawaine Hamilton-Temple-Blackwood (4 November 18703 July 1917), known as Lord Basil Temple Blackwood, was a British lawyer, civil servant and book illustrator. Early life Temple Blackwood was the third son and fifth child of Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava and Hariot Hamilton-Temple-Blackwood. He was born in Clandeboye, Ireland. After spending part of his childhood in Canada, where his father was Governor General, he attended Harrow School. He went up to Balliol College, Oxford in 1891, but never graduated. Whilst at Oxford, he became friends with Hilaire Belloc, with whom he would enjoy long walks and canoeing trips. Illustrations In 1896, Belloc approached Blackwood to illustrate his book of humorous children's verse, '' The Bad Child's Book of Beasts''. Blackwood's amusing pen and ink sketches were in a style which has been described as "German expressionism", and were credited only to "B.T.B.". The book was an immediate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
