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Aurélia Leguet Marc Gibernau Laetitia Shintu Stefano Caldarelli Sandrine Moja Sylvie Baudino Jean-Claude Caissard 《Die Naturwissenschaften》2014,101(8):623-635
Staining and histochemistry of volatile organic compounds (VOCs) were performed at different inflorescence developmental stages on nine aroid species; one temperate, Arum italicum and eight tropical from the genera Caladium, Dieffenbachia and Philodendron. Moreover, a qualitative and quantitative analysis of VOCs constituting the scent of A. italicum, depending on the stage of development of inflorescences was also conducted. In all nine species, vesicles were observed in the conical cells of either the appendix or the stamens (thecae) and the staminodes. VOCs were localised in intracellular vesicles from the early stages of inflorescence development until their release during receptivity of gynoecium. This localisation was observed by the increase of both number and diameter of the vesicles during 1 week before receptivity. Afterwards, vesicles were fewer and smaller but rarely absent. In A. italicum, staining and gas chromatography analyses confirmed that the vesicles contained terpenes. The quantitatively most important ones were the sesquiterpenes, but monoterpenes were not negligible. Indeed, the quantities of terpenes matched the vesicles’ size evolution during 1 week. Furthermore, VOCs from different biosynthetic pathways (sesquiterpenes and alkanes) were at their maximum quantity 2 days before gynoecium receptivity (sesquiterpenes and alkanes) or during receptivity (isobutylamine, monoterpenes, skatole and p-cresol). VOCs seemed to be emitted during gynoecium receptivity and/or during thermogenesis, and FADs are accumulated after thermogenesis in the spadix. These complex dynamics of the different VOCs could indicate specialisation of some VOCs and cell machinery to attract pollinators on the one hand and to repulse/protect against phytophagous organisms and pathogens after pollination on the other hand. 相似文献
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Julien Saada Olivier Parant Sylvie Kessler Jacqueline Aziza Marie France Sarramon 《黑龙江环境通报》2006,26(1):9-10
Congenital splenic cyst (CSC) is a rare condition, and only a few cases with prenatal diagnosis and no associated malformation have been reported. Spontaneous regression is possible in case of mild CSC (under 40 mm), but enlargement or secondary complications may lead to surgical treatment. We report, herein, two cases of isolated mild CSC with complete spontaneous postnatal regression. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
115.
Marguerite Hureaux Sarah Guterman Bérénice Hervé Marianne Till Sylvie Jaillard Sylvie Redon Myléne Valduga Charles Coutton Chantal Missirian Fabienne Prieur Brigitte Simon-Bouy Claire Beneteau Paul Kuentz Caroline Rooryck Nicolas Gruchy Nathalie Marle Morgane Plutino Lucie Tosca Celine Dupont Jacques Puechberty Caroline Schluth-Bolard Laurent Salomon Damien Sanlaville Valérie Malan François Vialard 《黑龙江环境通报》2019,39(6):464-470
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Summary. Most dung beetles colonize the faeces of several vertebrate species without much discrimination, and are thus often considered
as polyphagous. Recent studies have provided evidence for clear feeding preferences in scarab beetles colonizing dung of herbivore
species, but little is known about these insects’ abilities to discriminate among odours from faeces of various herbivores.
In this study, trophic preferences were examined using blocks of pitfall traps baited with dung from four different herbivore
species, i.e., sheep, cattle, horse, and red deer, in a mountainous area of south-central France. 4941 coprophagous scarabs,
belonging to 27 species, were captured. Beetles were more attracted to dung of sheep (2257 individuals) than that of cattle
(1294 individuals), followed by deer dung (768 individuals) and horse dung (622 individuals). Eleven of the 27 beetle species
collected had significant feeding preferences for one of the four dung types. For each insect species, trophic habits did
not vary between the two different sites of trapping, an open pasture and a wooded habitat. In laboratory olfactometer bioassays,
scarab beetles orientated preferentially towards the dung volatiles from the dung type they preferred in the field. Trypocopris pyrenaeus, Anoplotrupes stercorosus, and Aphodius rufipes were more attracted to volatile compounds from sheep dung, Onthophagus fracticornis significantly preferred horse dung volatiles, and Aphodius haemorrhoidalis responded positively to deer dung odours. The role of dung olfactory cues in the process of resource selection by dung beetles
is discussed. 相似文献
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Jelena Cvejic Sylvie Tambutte Severine Lotto Momir Mikov Ivan Slacanin Denis Allemand 《Marine Biology》2008,154(5):931-932