全文获取类型
收费全文 | 140篇 |
免费 | 2篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 12篇 |
环保管理 | 8篇 |
综合类 | 23篇 |
基础理论 | 41篇 |
污染及防治 | 33篇 |
评价与监测 | 12篇 |
社会与环境 | 6篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 13篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 13篇 |
2012年 | 13篇 |
2011年 | 9篇 |
2010年 | 4篇 |
2009年 | 4篇 |
2008年 | 9篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 4篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有142条查询结果,搜索用时 15 毫秒
41.
A method for the measurement of the relative toxicity of Cu2+ in aquatic environments is proposed. It is based on the quantitative measurement on the shape change of the supercoiled DNA after it is contacted with different levels of Cu2+ for various time intervals. In the absence of any redox reagents, all supercoiled DNA degraded into other forms of DNA after 24h incubation in the presence of 5.13 x 10(-3), 5.08 x 10(-4) and 5.35 x 10(-5)mol/L Cu2+. At a lower Cu2+ concentration (10(-6)mol/L), 44% of supercoiled DNA retained its original supercoiled form after 24 h, and 29% after 48 h. The concentration of RC50, i.e. concentration of pollutants at which 50% of the supercoiled DNA was relaxed compared to control samples, can be obtained from the does-response curves at different exposure time, which may provide a rapid and convenient approach to assess the relative toxicity of environmental pollutants. 相似文献
42.
Calzoni GL Antognoni F Pari E Fonti P Gnes A Speranza A 《Environmental pollution (Barking, Essex : 1987)》2007,149(2):239-245
The purpose of this work was to evaluate the quality of a rural area near Faenza (Italy) by using an active biomonitoring approach, i.e., by placing homogeneous individuals of the perennial shrub Rosa rugosa in different sites throughout the area. Further sites, within the city or its environs, were used for comparison. Soil and leaves of R. rugosa were analyzed for their heavy metal content. The total heavy metal pattern of leaves closely paralleled the pattern registered in soil, with the highest content (both in total and assimilable forms) at the site in the urban area, which is exposed to heavy traffic. Pollen quality (abortiveness and viability) was also tested as a potential indicator of pollution. Pollen abortiveness was strictly related to Pb levels in leaves, while viability was inversely related to leaf Cr content. Our results suggest that R. rugosa has the potential to be a good biomonitoring system. 相似文献
43.
44.
Sergio Rossi Georgios Tsounis Covadonga Orejas Tirma Padrón Josep-Maria Gili Lorenzo Bramanti Núria Teixidó Julian Gutt 《Marine Biology》2008,154(3):533-545
The distribution and population structure of the eurybathic gorgonian Corallium rubrum were studied off Cap de Creus (Costa Brava, Northwestern Mediterranean Sea). Red coral is endemic to the Mediterranean Sea
and the adjacent NE Atlantic coast, where it has been over exploited for centuries. This study presents, the first quantitative
data on the spatial distribution and structure of a population extending between 50 (common SCUBA limits) and 230 m depth,
and compared it with shallow populations previously studied in the same area. Different remotely operated vehicles (ROV) and
two methodological approaches were employed during four cruises between 2002 and 2006: 1-Extensive surveys: sea to coast transects
in which red coral density and patch frequency were recorded; 2-Intensive surveys, in which parameters describing colony morphology
were recorded. Most of the hard substrate between 50 and 85 m depth was inhabited by red coral colonies, showing a patch frequency
of 8.3 ± 7.9 SD patches per 100 m-transect (total transect area: 34 m2), and within-patch colony densities of 16–376 colonies m−2 (mean of 43 ± 53 colonies m−2). Below 120 m depth red coral was less abundant, and rather than forming dense patches as in shallow water, isolated colonies
were more common. The population structure differed between sites that are easily accessible to red coral fishermen, and remote
ones (both at similar depth, 60–80 m), as colonies in easily accessible locations were smaller in height and diameter, and
showed a less developed branching pattern. At shallower locations (10–50 m depth) the population structure was significantly
different from those at deeper locations, due to the heavy harvesting pressure they are exposed to in the shallows. Twenty-five
to forty-six percentage of the deeper colonies were taller than 6 cm, while only 7–16% of the shallow water colonies exceeded
6 cm colony height. Forty-six to seventy-nine percentage of the colonies in deeper waters were large enough to be legally
harvested, while only 9–20% of the shallow water colonies met the 7 mm legal basal diameter to be collected. The branching
pattern was also better developed in deeper colonies, as up to 16% of the colonies showed fourth order branches, compared
to less than 1% of the shallow water colonies (of which 96% consisted of only one single branch). The results thus confirm
that C. rubrum populations above 50 m depth are exposed to a higher harvesting intensity than deeper populations in the same area. 相似文献
45.
Lorenzo Pérez-Rodríguez 《Behavioral ecology and sociobiology》2008,62(6):995-1005
Carotenoid-based ornaments act as signals of quality in many animal species. In contrast to feathers, which are relatively
stable structures, carotenoid-pigmented integuments (e.g. bills, lores, tarsi) can change colour rapidly and may better reflect
changes in physiological condition. I studied the seasonal variations in plasma carotenoids in red-legged partridges (Alectoris rufa) kept on a constant diet and free of intestinal parasites. Furthermore, I analyzed whether seasonal changes in circulating
carotenoids were mirrored by the carotenoid-based coloration of eye rings and bill of this species. Plasma carotenoids showed
seasonal variation, with higher levels coinciding with the end of the mating and the start of the laying season. Eye ring
pigmentation was related to plasma carotenoid levels, and changes in bill hue (but not changes in UV or red bill chroma) mirrored
the variation in plasma carotenoids during the breeding season. Despite the seasonal variation, individual differences in
eye ring pigmentation and bill hue, UV and red chroma were consistent throughout the breeding season. Similarly, individual
differences in eye ring pigmentation and bill hue and red chroma remained consistent between consecutive years. These results
suggest that carotenoid based integumentary colorations act as dynamic traits that accurately reflect the carotenoid-status
of individuals, thus reliably indicating consistent differences in individual quality. Furthermore, variability in signal
expression appears to have a relevant genetic/phenotypic basis independently of environmental conditions.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
46.
Ilaria Fantasia Silvia Catagini Giulia Zamagni Pantaleo Greco Irene Bianchini Sofia Bussolaro Mariachiara Quadrifoglio Leila Lo Bello Lorenzo Monasta Giuseppe Ricci Flavio Faletra Agnese Feresin Tamara Stampalija 《黑龙江环境通报》2023,43(7):929-936
Objectives
To evaluate the clinical significance of nuchal translucency (NT) between the 95th–99th percentile in terms of typical and atypical chromosomal abnormalities (ACAs), associated fetal congenital defects and postnatal outcome.Methods
A retrospective cohort study of fetuses with NT between the 95th–99th percentile. Data regarding the rate of associated fetal defects, genetic abnormalities and postnatal outcome were collected.Results
A total of 306 cases of fetuses with an NT between the 95th–99th percentiles were included. The overall rate of genetic abnormalities was 12.1% (37/306). Chromosomal abnormalities were found in 10.1% (31/306) of cases and 2% were ACA (6/306). Within this group, two were pathogenic Copy Number Variants (CNVs) and four were single gene disorders. The overall rate of fetal congenital defects was 13.7% (42/306). All ACAs were found in fetuses with congenital defects. Postnatally, a new diagnosis of a single gene disorder was made in 0.85% of cases (2/236).Conclusions
The presence of an NT between the 95th–99th percentiles carries a 10-fold increased risk of fetal defects, representing an indication for referral for a detailed fetal anatomy evaluation. The risk of ACA is mainly related to the presence of fetal defects, irrespective of the combined test risk. 相似文献47.
Lorenzo Del Savio Bettina Schmietow 《Journal of Agricultural and Environmental Ethics》2013,26(4):787-796
In this paper we argue that there is a duty to inform consumers about the environmental impact of foods, and discuss what this duty entails and to whom it falls. We analyze previous proposals that justify ethical traceability with arguments from sustainability and the respect for the autonomy of consumers, showing that they cannot ground a duty to inform. We argue instead that the duty rests on the right of consumers not to be harmed, insofar as consumers have an interest in the morality of their own agency that is frustrated if they are not informed about the environmental impact of the production and transport of what they consume. Our argument detaches the regulation of labeling from substantive theories of environmental ethics or perfectionist conceptions of citizens’ responsibility, thus defending a case for labeling that is compelling also for those who take the role of the state to be limited to the prevention of harm. 相似文献
48.
49.
József Vuts Till Tolasch Lorenzo Furlan éva Bálintné Csonka Tamás Felf?ldi Károly Márialigeti Teodora B. Toshova Mitko Subchev Amália Xavier Miklós Tóth 《Chemoecology》2012,22(1):23-28
The presence of geranyl octanoate, previously found in pheromone gland extracts of Agriotes lineatus females, was also demonstrated in gland extracts of A. proximus females. Similar to A. lineatus, geranyl butanoate was present only in trace amounts in A. proximus female gland extracts. In air entrainment samples of female A. lineatus and A. proximus beetles, the relative ratio of geranyl butanoate and geranyl octanoate was higher than that in gland extracts. In addition,
comparison of a segment of the mitochondrial cytochrome c oxidase subunit I gene of feral specimens of A. lineatus and A. proximus showed >99% similarity. Both pheromone profile and nucleotide sequence analysis delineate close relationship between the
investigated taxa and postulate taxonomic revision. Further studies on sympatric populations of A. lineatus and A. proximus are underway to investigate and better understand possible processes of species diversification. 相似文献
50.