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Elemental boron, boron oxide, boric acid, borates, and many organoboron compounds are relatively nontoxic to humans and animals (with toxicity similar to that of table salt). The LD 50 (dose at which there is 50% mortality) for animals is about 6 g per kg of body weight.
Boron in the atmosphere is derived from soil dusts, volcanic emissions, forest fires, evaporation of boric acid from seawater, biomass emissions, and sea spray. [1] Sea salt aerosols are the largest flux to the atmosphere. On land, boron cycles through the biosphere by rock weathering, and wet and dry deposition from the atmosphere. [1] [2]
Many reactions in life sciences involve water and metal ions are often at the catalytic centers (active sites) for these enzymes, i.e. these are metalloproteins. Often the reacting water is a ligand (see metal aquo complex). Examples of hydrolase enzymes are carbonic anhydrase, metallophosphatases, and metalloproteinases. Bioinorganic chemists ...
Selenium, which is an essential element for animals and prokaryotes and is a beneficial element for many plants, is the least-common of all the elements essential to life. [ 3 ] [ 63 ] Selenium acts as the catalytic center of several antioxidant enzymes, such as glutathione peroxidase , [ 11 ] and plays a wide variety of other biological roles .
A borane is a compound with the formula BR x H y although examples include multi-boron derivatives. A large family of boron hydride clusters is also known. In addition to some applications in organic chemistry , the boranes have attracted much attention as they exhibit structures and bonding that differs strongly from the patterns seen in ...
Boron is renowned for cluster species, e.g. dodecaborate [B 12 H 12] 2-. Such clusters have many organic derivatives. One example is [B 12 (CH 3) 12] 2-and its radical derivative [B 12 (CH 3) 12] −. [16] Related cluster compounds with carbon vertices are carboranes; the best known is orthocarborane, C 2 B 10 H 12. Carboranes have few ...
Robert J. Flaherty's 1922 film Nanook of the North is typically cited as the first feature-length documentary. [1] Decades later, Walt Disney Productions pioneered the serial theatrical release of nature-documentaries with its production of the True-Life Adventures series, a collection of fourteen full length and short subject nature films from 1948 to 1960. [2]
A natural history of the oceans. Also known as The Blue Planet: Seas of Life for North America release. David Attenborough (narrator), Alastair Fothergill (producer) Wild Africa: 2001: A portrait of Africa's landscapes and wildlife. Fergal Keane (narrator) Weird Nature: 2002: Strange animal behavior: Ciaran McMenamin: Talking with Animals: 2002