منابع مشابه
Palaeontology: The 165-Million-Year Itch
New flea-like fossils from China provide a rare, tantalizing glimpse of bizarre insects in the Cretaceous and Jurassic. Possibly the oldest flea-like animals known, they provide a challenge to the functional morphologist to infer which animals they may have targeted.
متن کاملThe seven-year itch.
Case 1, a white male aged 42, was first seen in July, 1943, suffering from secondary syphilis. He was admitted to hospital and was treated with twice weekly injections of N.A.B. and bismuth (total 4 5 g. and 1 2 g. respectively); 4 months later he had become sero-negative but he was given a second course of injections in November/December, 1943 (Mapharside 0-5 g. and bismuth 1-2 g.). Further S....
متن کاملThe million-year wait for macroevolutionary bursts.
We lack a comprehensive understanding of evolutionary pattern and process because short-term and long-term data have rarely been combined into a single analytical framework. Here we test alternative models of phenotypic evolution using a dataset of unprecedented size and temporal span (over 8,000 data points). The data are body-size measurements taken from historical studies, the fossil record,...
متن کاملPalaeontology: The New Conservative
Cambrian Orsten-type fossils have yielded specimens with a uniquely detailed morphology from the early stages of animal evolution. A newly discovered crustacean larva illustrates how morphology and lifestyle over half a billion years ago closely resembled those of extant relatives.
متن کاملMore than a seven-year itch.
Keith Thoday's career in dermatology came about almost by accident and, he says, has often been helped by being in the right place at the right time.
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ژورنال
عنوان ژورنال: Current Biology
سال: 2012
ISSN: 0960-9822
DOI: 10.1016/j.cub.2012.03.014