Tam Minton - National Geographic Photo Contest 2012 - National Geographichttps://www.facebook.com/natgeo
Getting to be a TAM flight attendant and go through the training is not an easy task. First, new employees must take classes at an external school for four months, pass a test, earn their license, then apply for a job with TAM. It is a rigorous process, but this assures that TAM en...
Phototaxis also involves independent control of motile activity in each cilium. Using demembranated cells, Kamiya and Witman showed that the two cilia ofChlamydomonasrespond to calcium differentially (Kamiya & Witman, 1984). At low calcium levels, the cilium opposite to the eyespot (Chapter 17) ...
位于比利时安特卫普的安特卫普中央火车站(© RelaxFoto.de / iStock / Getty Images) 01:42:52 丹麦,萨尔图姆海滩(© Nick Brundle Photography / Moment / Getty Images) 01:42:52 法国,科西嘉岛皮亚纳小海湾(© Jan Wlodarczyk / Alamy Stock Photo) 01:42:52 西澳大利亚州,幸运湾的西部灰袋鼠(...
南岛民族人很久以前就将刁曼岛视为南中国海的航海标记,以及补充重要食物和燃料的航海中转站。在过去半个世纪左右,刁曼岛因为拥有众多海洋保护区而声名远扬,保护着丰富的陆地和水下动植物群。广阔的珊瑚礁系统(图中展示了一小部分)中生活着大约 350 个珊瑚物种,此外还
and dichloromethane/1,1,2-trichloroethane, polyacrylic (dupont Acrylic 68070 available from E. I. du Pont De Nemours & Co.) and aromatic hydrocarbons, polyurethane (Estane® 5707FIP, available from B. F. Goodrich Chemical Co.) and tetrahydrofuran/ketone blend, ECP-117 polypyrrole available ...
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(NH4+)) for photosynthesis28,29,30. Due to the isotopic fractionation that occurs in de-amination and other metabolic reactions, this ammonium is depleted in15N (ref.28). In symbiont-barren coral species (as in heterotrophic organisms in general), the15N-depleted metabolic ammonium is excreted...
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