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71.
A marked decline in the contribution by Marovo Lagoon to the annual total bêche-de-mer production of the Solomon Islands from
58% in 1989 to 17% in 2003 prompted investigation of their current biomass and diversity. We also assessed changes to critical
ecological services and the prospects for population recovery following a fisheries closure. Day time and nocturnal transects
revealed a mean abundance of 32.4 (SD = 5.3) low value species per ha (e.g. Holothuria atra, H. edulis, H. coluber and Thelenota anax) and 15.2 (SD = 2.7) high value species per ha (e.g. H. fuscogilva, Actinopyga lecanora, Stichopus hermanni and Thelenota ananas). Following a 17 month closure of the fishery (2005–2007), the abundance of bêche-de-mer was reported by local fisherman
to have increased; however, no scientific studies were conducted that can substantiate this community held belief. The current
study aimed to document the impact of re-opening the fishery in 2007 and documented a decline in high value species of 9%
over a 5 month period following the opening of the fishery, while low value species continued to increase in abundance by
11%, over the same period based on nocturnal surveys. Continued observation of the recovery, post closure, and any subsequent
harvest in Marovo will be required to properly understand population dynamics and provide a sustainable harvest plan for bêche-de-mer
in the future. 相似文献
72.
Anne Christine Knag Marion Sebire Ian Mayer Sonnich Meier Patrick Renner Ioanna Katsiadaki 《Chemosphere》2013
Oil pollution from various sources, including exploration, production and transportation, is a growing global concern. The highest toxicity of hydrocarbon pollutants is associated with the water-soluble phase compounds, including naphthenic acids, a known component found in all hydrocarbon deposits. Recently, naphthenic acids (NAs) have shown estrogenic and anti-androgenic effects in vitro. For this reason we investigated the potential effects of two commercial mixtures of naphthenic acids on fish in vivo, using the three-spined stickleback (Gasterosteus aculeatus) as a model species. 相似文献
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Paule Bénit Jean-Paul Bonnefont Ali Kara Mostefa Christine Francannet Arnold Munnich Pierre F. Ray 《黑龙江环境通报》2001,21(4):279-283
Tuberous sclerosis (TSC) is a frequent autosomal-dominant condition (affecting 1 in 6000 individuals) caused by various mutations in either the hamartin (TSC1) or the tuberin gene (TSC2). This allelic and non-allelic heterogeneity makes genetic counseling and prenatal diagnosis difficult, especially as a significant proportion of TSC cases are due to de novo mutations. For this reason the identification of the disease causing mutation is mandatory for accurate counseling, yet current mutation detection methods such as single-strand conformation polymorphism (SSCP) or denaturing gradient gel electrophoresis (DGGE) are labor intensive with limited detection efficiency. Denaturing high-performance liquid chromatography (DHPLC) is a high-throughput, semi-automated mutation detection system with a reported mutation detection rate close to 100% for PCR fragments of up to 800 bp. We used a recently described DHPLC assay allowing the efficient detection of mutations in TSC1 to analyze the DNA extracted from a chorion villus sample in order to perform a prenatal diagnosis for TSC. The fetus was found not to have inherited the deleterious mutation and the DHPLC diagnosis was confirmed by haplotype analysis. This represents the first DHPLC-based prenatal diagnosis of a genetic disease. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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A number of different pretreatment and extraction procedures were compared with regard to recovery of PCDD/PCDF from fly ash. Highest results were obtained using an acid digestion with excess dilute HCl, followed by freeze drying of the residue and hot extraction by toluene. 相似文献
79.
Cost of parental care in the woodroach Cryptocercus punctulatus Scudder (Dictyoptera: Cryptocercidae) 总被引:2,自引:0,他引:2
Summary The objective of this study was to measure the effect of parental care on the reproductive capabilities and survival of adult Cryptocercus punctulatus Scudder. Brood removal studies show that the long term parental care exhibited by this woodroach can exact a cost in terms of future reproduction by delaying a second reproductive episode. If C. punctulatus is used as a model of the ancestral state of the termites, changes in responsibility for care giving behavior can account for all the higher components of eusociality (overlap of worker generations, brood care by workers, non-reproductive castes) by shifting the cost of parental care from the adults to the oldest offspring. 相似文献
80.
Summary The Dominican Republic and other Caribbean countries face serious challenges to their natural resource base. In recent years
the government of the Dominican Republic has taken major steps toward the development and implementation of a comprehensive
plan for national natural resources management. This plan is called Plan Sierra. An important component of this plan is the
outline of actions for carrying out an environmental education programme within the country. This demonstrates a commitment
to fulfill Recommendation No. 96 of the Stockholm Conference in a way that could become a model for other Latin American nations.
Clinton L. Shepard is Assistant Professor in the Division of Environmental Education, School of Natural Resources, The Ohio
State University. Dr Shepard holds a Bachelor of Science degree in Zoology from the University of Kentucky and graduate degrees
from The Ohio State University in Natural Resources/Environmental Education and Education-Foundations and Research. He has
worked as an interpreter and Environmental Education Coordinator for the State of Ohio Department of Natural Resources, a
research associate for ERIC—Science, Math, and Environmental Education Clearinghouse, and College instructor in interpretive
methods, environmental education methodology, resident outdoor programming, and natural resources development. He is also
involved in international research and development, especially in the Caribbean Basin.
Robert E. Roth is Chairman/Professor in the Division of Environmental Education, School of Natural Resources, The Ohio State
University. Dr Roth received a Bachelor's degree in Wildlife Management, a Bachelor's degree in Secondary Science Education,
a Master's degree in Conservation Education from The Ohio State University, and his Ph.D. in Environmental Education from
The University of Wisconsin. he came to OSU in 1969 and since that time has designed and institutionalized the only academic
unit in the US that offers both well developed undergraduate and graduate programmes in Environmental Communications, Education
and Interpretation and has published over 40 works in the field. He has been instrumental in implementing a growing international
environmental education research and development emphasis in the wider Caribbean, he continues as an Executive Editor of theJournal of Environmental Education. 相似文献