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91.
Jacques Dutka 《Archive for History of Exact Sciences》1991,43(3):225-249
Communicated by U. Bottazzini 相似文献
92.
The rapid closure of the Venus flytrap (Dionaea muscipula) leaf in about 100 ms is one of the fastest movements in the plant kingdom. This led Darwin to describe the plant as "one of the most wonderful in the world". The trap closure is initiated by the mechanical stimulation of trigger hairs. Previous studies have focused on the biochemical response of the trigger hairs to stimuli and quantified the propagation of action potentials in the leaves. Here we complement these studies by considering the post-stimulation mechanical aspects of Venus flytrap closure. Using high-speed video imaging, non-invasive microscopy techniques and a simple theoretical model, we show that the fast closure of the trap results from a snap-buckling instability, the onset of which is controlled actively by the plant. Our study identifies an ingenious solution to scaling up movements in non-muscular engines and provides a general framework for understanding nastic motion in plants. 相似文献
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Gribouval O Gonzales M Neuhaus T Aziza J Bieth E Laurent N Bouton JM Feuillet F Makni S Ben Amar H Laube G Delezoide AL Bouvier R Dijoud F Ollagnon-Roman E Roume J Joubert M Antignac C Gubler MC 《Nature genetics》2005,37(9):964-968
Autosomal recessive renal tubular dysgenesis is a severe disorder of renal tubular development characterized by persistent fetal anuria and perinatal death, probably due to pulmonary hypoplasia from early-onset oligohydramnios (Potter phenotype). Absence or paucity of differentiated proximal tubules is the histopathological hallmark of the disease and may be associated with skull ossification defects. We studied 11 individuals with renal tubular dysgenesis, belonging to nine families, and found that they had homozygous or compound heterozygous mutations in the genes encoding renin, angiotensinogen, angiotensin converting enzyme or angiotensin II receptor type 1. We propose that renal lesions and early anuria result from chronic low perfusion pressure of the fetal kidney, a consequence of renin-angiotensin system inactivity. This is the first identification to our knowledge of a renal mendelian disorder linked to genetic defects in the renin-angiotensin system, highlighting the crucial role of the renin-angiotensin system in human kidney development. 相似文献
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Jacques Dutka 《Archive for History of Exact Sciences》1981,24(1):11-29
Summary A history of the development of the incomplete beta function is outlined as well as of some of the analytical and approximation techniques used for its numerical evaluation.
Dedicated to W. Edwards Deming, my teacher and my friend 相似文献
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N Frénoy C Rimbant D Buffe 《Comptes rendus des séances de l'Académie des sciences. Série D, Sciences naturelles》1975,281(21):1649-1651
alpha2 H globulin, a glycoferroprotein, was first demonstrated in the sera of patients with malignant diseases. This protein was isolated from cancerous human liver, and compared with ferritin, a ferroprotein showing some identical properties (presence of iron, high molecular weight, common antigenic determinants). However, physicochemical differences were observed between these two proteins. The study of protein dissociation was performed by polyacrylamide gel electrophoresis in sodium dodecyl sulfate after reduction by mercaptoethanol. A similar molecular weight of 19 000 is obtained for subunits of these two proteins. This value agrees well with the results obtained by other authors for ferritin. 相似文献
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Kévin Baranger Yannick Marchalant Amandine E. Bonnet Nadine Crouzin Alex Carrete Jean-Michel Paumier Nathalie A. Py Anne Bernard Charlotte Bauer Eliane Charrat Katrin Moschke Mothoharu Seiki Michel Vignes Stefan F. Lichtenthaler Frédéric Checler Michel Khrestchatisky Santiago Rivera 《Cellular and molecular life sciences : CMLS》2016,73(1):217-236