全文获取类型
收费全文 | 531篇 |
免费 | 10篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 10篇 |
环保管理 | 92篇 |
综合类 | 67篇 |
基础理论 | 132篇 |
环境理论 | 12篇 |
污染及防治 | 142篇 |
评价与监测 | 39篇 |
社会与环境 | 39篇 |
出版年
2023年 | 4篇 |
2022年 | 10篇 |
2021年 | 7篇 |
2020年 | 8篇 |
2019年 | 10篇 |
2018年 | 24篇 |
2017年 | 22篇 |
2016年 | 22篇 |
2015年 | 16篇 |
2014年 | 21篇 |
2013年 | 44篇 |
2012年 | 29篇 |
2011年 | 45篇 |
2010年 | 24篇 |
2009年 | 24篇 |
2008年 | 34篇 |
2007年 | 27篇 |
2006年 | 35篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 29篇 |
2002年 | 18篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 9篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 7篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有549条查询结果,搜索用时 31 毫秒
321.
Rodrigo Ruano Olivier Picone Alexandra Benachi Anne-Gaelle Grebille Jelena Martinovic Yves Dumez Marc Dommergues 《黑龙江环境通报》2003,23(7):539-542
To illustrate the three-dimensional sonographic features of a rare genetic disorder, we report on prenatal diagnosis of osteogenesis imperfecta congenita associated with encephalocele at 13 weeks of gestation, using conventional and three-dimensional ultrasound. Because the parents were first-degree cousins and on the basis of the family history, a recessive autosomal inheritance was suspected. Of seven previous pregnancies, five were unaffected and two had been terminated in the second trimester owing to a similar abnormality (one affected boy and one affected girl). In the case we present, the diagnosis was made on the basis of two-dimensional ultrasound performed by physicians aware of the history; the quality of three-dimensional ultrasound imaging suggests that this technique might have contributed toward establishing a precise diagnosis in the absence of a positive family history. Besides, the global view provided by three-dimensional surface-rendering images made the parents more confident of the accuracy of the diagnosis. Although osteogenesis imperfecta congenita is generally considered as autosomal dominant, the case we report suggests that it may be inherited in a recessive autosomal fashion at least when associated with encephalocele. Three-dimensional ultrasound confirmed the conventional two-dimensional examination and was helpful in convincing the parents of the accuracy of the diagnosis. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
322.
Edouard Kauffmann Horatiu Roman Georges Barau Hervé Dumas Annick Laffitte Alain Fourmaintraux Marc Bintner Hanitra Randrianaivo 《黑龙江环境通报》2003,23(2):163-165
The Jarcho–Levin syndrome is a specific form of spondylocostal/spondylothoracic dysostosis. There have been various classifications of this syndrome. We present the case of a severe prenatal Jarcho–Levin syndrome, diagnosed by ultrasound examination during the first trimester of pregnancy in a family with no previous medical history of an affected child. X-ray exploration, high-resolution spiral computed tomography and autopsy confirmed the diagnosis. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
323.
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
324.
Montano Luigi Donato Francesco Bianco Pietro Massimiliano Lettieri Gennaro Guglielmino Antonino Motta Oriana Bonapace Ian Marc Piscopo Marina 《Environmental science and pollution research international》2021,28(28):37031-37040
Environmental Science and Pollution Research - The epidemic of the new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has impacted worldwide with its infectious spread and mortality... 相似文献
325.
The Northern wheatear (Oenanthe oenanthe) is a small long-distance migratory songbird that breeds throughout the Northern hemisphere and winters in sub-Saharan Africa. The main components of its migratory behaviour, i.e. seasonal migratory restlessness and body mass changes, have been shown to be under endogenous control. However, it is still unknown whether the disposition to accumulate fuel reserves is an inherited trait. We cross-bred Northern wheatears from two populations known to accumulate different amounts of fuel in a common-garden setup, and measured their maximum fuelling as the difference between the lightest and heaviest body mass recorded over each year for 4 years or longer. We used the largest value as a measure of maximum voluntary fuelling potential. F1-generation “hybrids” showed intermediate values to those of the parent populations. It was previously shown that in the wheatear the amount of fuel accumulated is closely linked to the presence of large ecological barriers to cross. This study shows that this adaptation has been fixed at the genetic level, and that intermediate traits are transferred to the next generation, with possible implications on the viability of such individuals in nature. 相似文献
326.
327.
328.
329.
330.