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3,3′-Diaminobenzidine (DAB) is an organic compound with the formula (C 6 H 3 (NH 2) 2) 2. This derivative of benzidine is a precursor to polybenzimidazole, which forms fibers that are renowned for their chemical and thermal stability. [1] As its water-soluble tetrahydrochloride, DAB has been used in immunohistochemical staining of nucleic ...
In the United Kingdom, 44.3% of the population now has a DAB digital radio set and 34.4% of listening is to different digital platforms. Because of the early success of the old DAB standard, the transition to the more efficient DAB+ takes more time. If DAB was switched off, older receivers would become worthless.
Chart showing the listening share of the United Kingdom's digital radio platforms – DAB(+), digital TV and online through a device or smartphone/tablet app. In the United Kingdom, the uptake of DAB has increased since the launch of the BBC national DAB ensemble in 1995.
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. This is a list of onomatopoeias, i.e. words that imitate, resemble, or suggest the source of the sound that they describe. For more information, see the linked articles. Human vocal sounds Achoo, Atishoo, the sound of a sneeze Ahem, a sound made to clear the throat or to draw attention ...
The audio quality of Australian DAB is correspondingly low - only 80 kbps for ClassicFM, for example, and most channels have much lower bitrates than this. So DAB is in general well below the 128 kbps traditionally accepted as CD quality, and an interference-free FM broadcast will almost certainly provide better audio. [dubious – discuss]
Historically, the definition of a scientific instrument has varied, based on usage, laws, and historical time period. [1] [2] [3] Before the mid-nineteenth century such tools were referred to as "natural philosophical" or "philosophical" apparatus and instruments, and older tools from antiquity to the Middle Ages (such as the astrolabe and pendulum clock) defy a more modern definition of "a ...
In biology, an identification key, taxonomic key, or frequently just key, is a printed or computer-aided device that aids in the identification of biological organisms. Historically, the most common type of identification key is the dichotomous key , a type of single-access key which offers a fixed sequence of identification steps, each with ...
The word radio is derived from the Latin word radius, meaning "spoke of a wheel, beam of light, ray".It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier [], Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system.