Hollier Denis & Jamin Jean (dir.). — Leiris unlimited

Denis Pelli

appeared, predator-prey interactions resulted in more selection pressure. Exceptionally preserved fossil occurrences reveal an increase in ecological complexity over time. Escalation in the number of different modes of life includes the exploitation of a greater range of levels above and below the sediment surface (tiering), as well as diversification of feeding mechanisms and modes of locomoti...

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The largest collection of Darwin's writings ever published appeared last month on the website The Complete Works of Charles Darwin Online (http://darwin-online.org.uk). Never before has so much Darwin material, and so many rare and widely dispersed items, been brought together in one place and made available free of charge. The site currently offers more than 50,000 pages of searchable text and...

Jean - Paul Fermand and Jean - Claude Brouet

In the majority o f chronic lymphocytic leukemias (CLL), proliferative B lymphocytes are thought to be frozen in vivo at a given maturat ion stage (1). Recently, several studies have emphasized that CLL cells could be driven to different iate into plasma cells in vitro (with or without proliferation) upon t r iggering by mitogens (2, 3, 4) or T cel l -der ived factors (5, 6). Th u s far, howeve...

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