Articles
Volume 4 (2009) - August 2009
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Research
Ralf Dressel, Kaomei Guan, Jessica Nolte, Leslie Elsner, Sebastian Monecke, Karim Nayernia, Gerd Hasenfuss, Wolfgang Engel Biology Direct 2009, 4:31 (28 August 2009) Pluripotent stem cells, such as adult germ-line and embryonic stem cells, can become targets of peptide-specific cytotoxic T lymphocytes despite low expression of major histocompatibility complex class I molecules.
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Research
Structural analysis of polarizing indels: an emerging consensus on the root of the tree of life Ruben E Valas, Philip E Bourne Biology Direct 2009, 4:30 (25 August 2009) The disparate rootings of the tree of life by Cavalier-Smith and Lake et al. converge on a single root when polarizable indels are analyzed using protein structure.
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Hypothesis
Kira S Makarova, Yuri I Wolf, John van der Oost, Eugene V Koonin Biology Direct 2009, 4:29 (25 August 2009) |
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Hypothesis
On the need for widespread horizontal gene transfers under genome size constraint Hervé Isambert, Richard R Stein Biology Direct 2009, 4:28 (25 August 2009) |
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Research
Armen Y Mulkidjanian, Michael Y Galperin Biology Direct 2009, 4:27 (24 August 2009) The relatively high zinc content of living cells and its role as cofactor in many key enzymes and RNA structures might reflect the origin of life in zinc-rich environments.
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Hypothesis
Armen Y Mulkidjanian Biology Direct 2009, 4:26 (24 August 2009) Life may have emerged owing to the ability of porous, hydrothermal zinc sulfide precipitates to store solar energy and reduce atmospheric carbon dioxide, providing nourishment and shelter for the first organisms.
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Discovery notes
Robson F De Souza, Lakshminarayan M Iyer, L Aravind Biology Direct 2009, 4:25 (14 August 2009) The Anabaena sensory rhodopsin signal transducer defines a novel class of small molecule binding beta-sandwich domains that are involved in carbohydrate recognition.
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