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The Complete Birds of the World
"This is a book like no other--the only truly comprehensive, one-volume illustrated guide to all of the world's birds, covering the complete International Ornithological Congress World Bird List. Featuring more than 300 stunning large-format, full-color plates, this accessible and authoritative encyclopedic reference presents incredibly detailed, accurate, and beautiful paintings of more than 10,700 species by some of the world's best bird artists, led by the legendary Norman Arlott and Ber van Perlo. In addition, The Complete Birds of the World provides detailed but concise identification information about each species on facing pages--including facts about voice, habitat, and geographic distribution. The result is a visual and verbal feast that captures the astonishing variety of bird life around the planet--and that will be cherished by any birder." -- Amazon.
Seminar on Regional Integration Law
Presenta un análisis de la integración económica, así como de los principales mercados comunes.
Collins Birds of the World
For the first time, the complete collection of the Collins Field Guides’ incredibly detailed, accurate and beautiful bird paintings has been brought together in one comprehensive volume.
The Eponym Dictionary of Amphibians
New species of animal and plant are being discovered all the time. When this happens, the new species has to be given a scientific, Latin name in addition to any common, vernacular name. In either case the species may be named after a person, often the discoverer but sometimes an individual they wished to honour or perhaps were staying with at the time the discovery was made. Species names related to a person are ‘eponyms’. Many scientific names are allusive, esoteric and even humorous, so an eponym dictionary is a valuable resource for anyone, amateur or professional, who wants to decipher the meaning and glimpse the history of a species name. Sometimes a name refers not to a person but...
Alytes
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Sulfur Sequestration Promotes Multicellularity During Nutrient Limitation
Abstract: The behaviour of Dictyostelium discoideum depends on nutrients1. When sufficient food is present these amoebae exist in a unicellular state, but upon starvation they aggregate into a multicellular organism2,3. This biology makes D. discoideum an ideal model for investigating how fundamental metabolism commands cell differentiation and function. Here we show that reactive oxygen species--generated as a consequence of nutrient limitation--lead to the sequestration of cysteine in the antioxidant glutathione. This sequestration limits the use of the sulfur atom of cysteine in processes that contribute to mitochondrial metabolism and cellular proliferation, such as protein translation and the activity of enzymes that contain an iron-sulfur cluster. The regulated sequestration of sulfur maintains D. discoideum in a nonproliferating state that paves the way for multicellular development. This mechanism of signalling through reactive oxygen species highlights oxygen and sulfur as simple signalling molecules that dictate cell fate in an early eukaryote, with implications for responses to nutrient fluctuations in multicellular eukaryotes
La granja
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Bioacoustics
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