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The sabellid polychaete Sabellastarte spectabilis (Grube 1878) was collected at approximately monthly intervals from January 2002 to December 2003 from intertidal and subtidal
reefs near the Hawaii Institute of Marine Biology in Kane’ohe Bay, Hawaii, USA (21°N, 157°W). Gametogenesis and spawning periodicity
were investigated using histological techniques and induction of spawning trials. Worms were characterized into four discrete
reproductive stages based on histological evidence: (1) No evidence of reproductive activity in the coelom (sex cannot be
determined), (2) Only coelomocytes present in the coelom (sex cannot be determined), (3) Some gametes present in the coelom
(sex can be determined) and (4) Coelom densely packed with gametes (sex can be determined). The small hermaphroditic portion
of the population was not used in this study. Stage 4 worms were present over an extended period of time (females, March–December
and males, March–November) indicating a potentially broad reproductive season. No correlation between day length and maturation
stages in S. spectabilis was detected. However, the statistical model Y = ([394.26 × X] − [7.793 × X
2]) − 4960.781 where Y the % frequency of Stage 4 worms and X the mean monthly water temperature explained 44% of the variation between water temperature and % frequency of Stage 4 worms.
Maturation appeared to coincide with water temperatures of 24–25°C (March–September) after which there is a reduction in the
% frequency of stage 4 individuals. Induction of spawning trials conducted between May and January showed the month of October
with a significantly higher percent success than any other month investigated. According to all available information (e.g.,
natural spawning in water tables, histological data, induction of spawning trials, correlation of maturation stages with observed
changes in average monthly water temperature.), there is an apparent peak in reproductive activity (spawning) within a broad
maturational season, which may be influenced by water temperature. 相似文献
105.
Cécile Courdier John Boudjarane Valérie Malan Christine Muti Brian Sperelakis-Beedham Sylvie Odent Sylvie Jaillard Chloé Quelin Cédric Le Caignec Olivier Patat Charlotte Dubucs Sophie Julia Caroline Schluth-Bolard Carole Goumy Sylvia Redon Jean-Baptiste Gaillard Minh Tuan Huynh Céline Dupont Anne-Claude Tabet Guillaume Cogan François Vialard Rodolphe Dard Guillaume Jedraszak Florence Jobic Mathilde Lefebvre Geneviève Quenum Saori Inai Mélanie Rama Fanny Sauvestre Frédéric Coatleven Julie Thomas Caroline Rooryck 《黑龙江环境通报》2023,43(6):734-745
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Hanane Bouchghoul Chloé Quelin Philippe Loget Féréchté Encha-Razavi Marie-Victoire Senat Lorraine Maheut Julie Galimand Sophie Collardeau-Frachon Lydie Da Costa Jelena Martinovic 《黑龙江环境通报》2018,38(10):772-778
We report a multiplex family with a GATA1 gene mutation responsible for a massive fetal cerebral hemorrhage occurring at 36 weeks. Two other stillbirth cousins presented with fetal hydrops and congenital hemochromatosis' phenotype at 37 and 12 weeks of gestation. Molecular screening revealed the presence of a c.613G>A pathogenic allelic variation in exon 4 of GATA1 gene in the 3 male siblings and their carrier mothers. The diagnosis of a GATA1 gene mutation may be suspected in cases of male fetuses with intracerebral bleeding, particularly if a history of prior fetal loss(es) and mild maternal thrombocytopenia are also present. 相似文献
108.
Jennifer G. Duan Richard H. French Julie Miller 《Journal of the American Water Resources Association》2002,38(1):255-263
ABSTRACT: The growth of aquatic plants in open‐channels has many adverse environmental effects including, but not limited to, impeding the transport of water, hindering navigation, increasing flood elevations, increasing sediment deposition, and degrading water quality. Existing control strategies include physical removal and chemical treatment. Physical removal is only a temporary solution and chemical treatment is unacceptable if the water will be consumed by humans. The hydrodynamic method can wash out the encroached aquatic plants by keeping flow velocity higher than the critical velocity required to bend and rupture (lodge) their stems. This approach is a promising, physically‐based, efficient, economic, and permanent solution for this problem. However, the success of this approach requires the accurate prediction of the critical lodging velocity. This paper presents an analytic study of the lodging velocity for the submerged portion of aquatic plants of narrow leaved emergent stems that are wider at bottom than the top. Based on the principles of engineering materials and the theory of turbulent flow, a semi‐empirical formula is derived for the prediction of the critical lodging velocity. It indicates that the lodging of aquatic plants is controlled not only by flow conditions but also the geometric and mechanical characteristics of the plants. These analytic results provide a satisfactory explanation of the lodging phenomena observed in the field and are verified by the available experimental data. 相似文献
109.
Julie Movellan Françoise Rocher Zohra Chikh Cécile Marivingt-Mounir Jean-Louis Bonnemain Jean-François Chollet 《Environmental science and pollution research international》2014,21(7):4861-4870
l-meta-tyrosine is an herbicidal nonprotein amino acid isolated some years ago from fine fescue grasses and characterized by its almost immediate microbial degradation in soil (half-life <24 h). Nine monohalogenated or dihalogenated analogs of this allelochemical have been obtained through a seven-step stereoselective synthesis from commercial halogenated phenols. Bioassays showed a large range of biological responses, from a growth root inhibition of lettuce seedling similar to that noted with m-tyrosine [2-amino-3-(2-chloro-5-hydroxyphenyl)propanoic acid or compound 8b] to an increase of the primary root growth concomitant with a delay of secondary root initiation [2-amino-3-[2-fluoro-5-hydroxy-3-(trifluoromethyl)phenyl]propanoic acid or compound 8h]. Compound 8b was slightly less degraded than m-tyrosine in the nonsterilized nutritive solution used for lettuce development, while the concentration of compound 8h remained unchanged for at least 2 weeks. These data indicate that it is possible to manipulate both biological properties and degradation of m-tyrosine by halogen addition. 相似文献
110.
Jean-Luc Carayon Nathan Téné Elsa Bonnafé Julie Alayrangues Lucie Hotier Catherine Armengaud Michel Treilhou 《Environmental science and pollution research international》2014,21(7):4934-4939
Thymol is a natural substance increasingly used as an alternative to pesticides in the fight against the Varroa destructor mite. Despite the effectiveness of this phenolic monoterpene against Varroa, few articles have covered the negative or side effects of thymol on bees. In a previous study, we have found an impairment of phototaxis in honeybees following application of sublethal doses of thymol—lower or equal to 100 ng/bee—under laboratory conditions. The present work shows the same behavioral effects on bees from hives treated with Apilife Var®, a veterinary drug containing 74 % thymol, with a decrease in phototactic behavior observed 1 day after treatment. Thus, thymol causes disruption of bee phototactic behavior both under laboratory conditions as well as in beehives. The bee exposure dose in treated hives was quantified using gas chromatography coupled to mass spectrometry (GC–MS), giving a median value of 4.3 μg per body 24 h after treatment, with 11 ng in the brain. The thymol level in 20 organic waxes from hives treated with Apilife Var® was also measured and showed that it persists in waxes (around 10 mg/kg) 1 year after treatment. Thus, in the light of (1) behavioral data obtained under laboratory conditions and in beehives, (2) the persistence of thymol in waxes, and (3) the high load on bees, it would appear important to study the long-term effects of thymol in beehives. 相似文献