Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie最新文献_第9页

The oldest stegocephalian from the Iberian Peninsula: evidence that temnospondyls were euryhaline 来自伊比利亚半岛的最古老的剑头类动物:temnospondyls是泛盐动物的证据

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01318-X

Michel Laurin , Rodrigo Soler-Gijón

引用次数: 23

Sur une symétrie fondamentale entre la morphogenèse et le fonctionnement des organes arborisés 关于形态发生和树状器官功能之间的基本对称

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01308-7

Vincent Fleury

引用次数: 2

Ultrastucture de Weddellomyces epicallopisma (Dothideales, Dacampiaceae, Ascomycota), plus particulièrement de ses ascospores 超结构的Weddellomyces epicallopisma (Dothideales, Dacampiaceae，子囊菌纲)，特别是子囊孢子

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01319-1

Pere Navarro–Rosinés , Claude Roux , André Bellemère

引用次数: 5

Propriétés des structures produites par les ingénieurs écologiques à la surface du sol d’une savane colombienne 生态工程师在哥伦比亚大草原土壤表面产生的结构特性

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01313-0

Thibaud Decaëns , Jesus H Galvis , Edgar Amézquita

{"title":"Propriétés des structures produites par les ingénieurs écologiques à la surface du sol d’une savane colombienne","authors":"Thibaud Decaëns , Jesus H Galvis , Edgar Amézquita","doi":"10.1016/S0764-4469(01)01313-0","DOIUrl":"10.1016/S0764-4469(01)01313-0","url":null,"abstract":"<div><p>Fourteen types of physical structures produced by ecosystem engineers were sampled at the surface of a savanna soil of Colombia. Invertebrates implicated in the creation of these structures were identified. Some physical (aggregate size and stability, bulk density) and chemical (C, N, P contents, pH, etc) properties of structures were assessed. Three large groups of structures were identified: (i) earthworm casts characterised by a high bulk density (1.3–1.4 g·cm<sup>–3</sup>), constituted of aggregates (7–10 mm), high in organic C (3–4 %) and assimilable nutrients; (ii) termite mounds with low bulk density (0.6–0.9 g·cm<sup>–3</sup>), constituted of aggregates (8–9 mm), high in organic C (3.5–10 %) and assimilable nutrients; and (iii) slightly compact (0.4–0.7 g·cm<sup>–3</sup>) and granular (aggregate size < 1.5 mm) termite superficial channels and ant mounds low in organic C (less than 1.5 %) and assimilable nutrients. These results underline the large diversity of the biogenic structures produced at the surface of the studied soil. They suggest the feasibility of a functional classification of engineer organisms that would take into account simultaneously the different functional attributes reflected by these structures.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 5","pages":"Pages 465-478"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(01)01313-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88758580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 51

Chorology of New Caledonian palms and possible evidence of Pleistocene rain forest refugia 新喀里多尼亚棕榈树的年代学和更新世雨林避难所的可能证据

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01312-9

Jean-Christophe Pintaud , Tanguy Jaffré , Henri Puig

{"title":"Chorology of New Caledonian palms and possible evidence of Pleistocene rain forest refugia","authors":"Jean-Christophe Pintaud , Tanguy Jaffré , Henri Puig","doi":"10.1016/S0764-4469(01)01312-9","DOIUrl":"10.1016/S0764-4469(01)01312-9","url":null,"abstract":"<div><p>The distribution of the 36 palm species of New Caledonia is studied in relation to several parameters: elevation, rainfall, geological substrate, phytogeographical sectors and vegetation types. The climate (thermal gradient and rainfall) appears to be the principal factor influencing the distribution of palms, the substrate effect being subordinate to the climatic pattern. Nearly all palm populations are included within the 1 500 mm isoline. Maximum levels of species richness and endemism are located in four areas receiving more than 3 000 mm of annual rainfall. We interpret these areas as former Pleistocene refugia of lowland rain forest based on three lines of evidence: 1) all locally endemic lowland palm species and genera are restricted to these areas; 2) local endemics occur on east-facing slopes receiving the highest rainfall and most likely to have sustained rain forests during the driest periods; and 3) several pairs of sister species are disjunct between the southeastern and northeastern high rainfall areas.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 5","pages":"Pages 453-463"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(01)01312-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76382539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

Comportements alimentaires au Moyen Âge à Grenoble : application de la biogéochimie isotopique à la nécropole Saint-Laurent (XIIIe–XVe siècles, Isère, France) 中世纪格勒诺布尔的饮食行为:同位素生物地球化学在圣劳伦斯墓地的应用(13 - 15世纪，isere，法国)

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01316-6

Estelle Herrscher , Hervé Bocherens , Frédérique Valentin , Renée Colardelle

引用次数: 36

Rôle pro- et anti-apoptotique du monoxyde d’azote, NO 一氧化氮(NO)的促凋亡和抗凋亡作用

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01315-4

Jean-Pierre Kolb

引用次数: 6

The proliferation of human T lymphoblastic cells induced by 5-HT1B receptors activation is regulated by 5-HT-moduline 5-HT1B受体激活诱导的人T淋巴母细胞增殖受5-HT1B调节

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-04-01 DOI: 10.1016/S0764-4469(00)01300-7

Carla Sibella-Argüelles

{"title":"The proliferation of human T lymphoblastic cells induced by 5-HT1B receptors activation is regulated by 5-HT-moduline","authors":"Carla Sibella-Argüelles","doi":"10.1016/S0764-4469(00)01300-7","DOIUrl":"10.1016/S0764-4469(00)01300-7","url":null,"abstract":"<div><p>Serotonin (5-hydroxytryptamine, 5-HT) is a well-known neurotransmitter and immunomodulator, which has been reported to affect the function of cells in the immune system. The purpose of the herein reported experiments was to investigate whether serotonin could regulate the proliferation of a human T lymphoblastic leukemia cell line (CCRF-CEM cells) and to characterize the 5-HT receptor(s) involved in this phenomenon using a pharmacological approach. The herein presented results show that serotonin alone stimulated the proliferation of CCRF-CEM cells and that this effect could be mimicked by two 5-HT<sub>1B/1D</sub> receptor agonists (L-694,247 and GR 46611). Serotonin- or L-694,247-induced increase in cell proliferation was inhibited by a selective 5-HT<sub>1B</sub> receptor antagonist, SB-224289. A recently identified endogenous tetrapeptide, 5-HT-moduline (Leu–Ser–Ala–Leu, LSAL), which specifically antagonizes 5-HT<sub>1B/1D</sub> receptor activity, was also shown to reverse the stimulating action of L-694,247 on T cell proliferation. Taken together, these results establish the existence of a direct serotonergic control of the T cell proliferation mediated through h5-HT<sub>1B</sub> receptors. In addition, these results are in favour of an immunomodulatory role of 5-HT-moduline.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 4","pages":"Pages 365-372"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(00)01300-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83766259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Détermination rapide du sexe chez des embryons de ragondin, Myocastor coypus, dès les premiers stades de gestation 从妊娠早期开始，ragondin, coypus肌海狸胚胎的快速性别鉴定

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-04-01 DOI: 10.1016/S0764-4469(00)01305-6

Pascale Garcia-Meunier , Laurence Pastout , Guillemette Chevalier , Christophe Guinet

{"title":"Détermination rapide du sexe chez des embryons de ragondin, Myocastor coypus, dès les premiers stades de gestation","authors":"Pascale Garcia-Meunier , Laurence Pastout , Guillemette Chevalier , Christophe Guinet","doi":"10.1016/S0764-4469(00)01305-6","DOIUrl":"10.1016/S0764-4469(00)01305-6","url":null,"abstract":"<div><p>The early knowledge of the sex may be crucial for the understanding of many features of ecological and evolutive biology, including offspring sex-ratio adjustment and evolution of breeding systems. In coypu (<em>Myocastor coypus</em>), significant variation in birth sex-ratios can be observed and selective abortion of entire litters is one of the cited mechanisms. In order to determine the sex of coypu embryos in the earlier stages of gestation (second week), we developed a molecular technique based on PCR amplification of a region of the <em>Sry</em> gene. These method used the combination of two sets of primers: one specific of the Y-chromosome; the other one, autosomal, is a positive control for amplification. Because of the direct amplification of embryo lysate without DNA extraction, the present sexing technique is rapid, relatively simple and inexpensive, and presents numerous advantages for the study at population scale.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 4","pages":"Pages 321-325"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(00)01305-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77463852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Comparaison de méthodes optiques pour estimer l’ouverture de la canopée et l’indice foliaire en forêt feuillue 阔叶林冠层开度和叶指数光学方法的比较

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-04-01 DOI: 10.1016/S0764-4469(00)01294-4

Kamel Soudani , Jean Trautmann , Jean-Michel Walter

{"title":"Comparaison de méthodes optiques pour estimer l’ouverture de la canopée et l’indice foliaire en forêt feuillue","authors":"Kamel Soudani , Jean Trautmann , Jean-Michel Walter","doi":"10.1016/S0764-4469(00)01294-4","DOIUrl":"10.1016/S0764-4469(00)01294-4","url":null,"abstract":"<div><p><span><span>Based on inversion of gap fraction data (Poisson model of foliage distribution), three optical methods using the Demon, the Plant Canopy Analyzer LAI-2000 (PCA) and hemispherical photographs, have been compared to estimate canopy openness (CO) and leaf area index (LAI) in a mature, </span>neutrophil, oak-beech-hornbeam forest on mull in eastern France. Mean CO over the whole hemisphere was similar for PCA (7.9 %) and hemispherical photographs (8.0 %). The needle method, a vertical point quadrat method, applied to the litter after leaf fall has served as a reference to LAI (4.7). The Demon provided the estimate (4.9) closest to the reference value. The PCA and hemispherical photographs underestimate mean LAI by 30 % (3.3) and 19 % (3.8), respectively, if used without correction. Based on fish-eye sensors, LAI estimates can be improved if 3 annuli (4.2) or 2 annuli (4.5) are used in place of 5 with the PCA, or by means of logarithmic averaging of gap fractions over azimuth at an appropriate angular </span>resolution (180°: 4.6, or 120°: 5.2) with hemispherical photographs. Not taking into account azimuthal variation in gap fraction distribution generates a more important error than the error induced by light scattering near horizon. In order to improve LAI estimates, an original iterative procedure is presented, which allows the simultaneous calculation of LAI over a broad range of angular azimuthal resolutions.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 4","pages":"Pages 381-392"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(00)01294-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72832309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12