全文获取类型
收费全文 | 498篇 |
免费 | 9篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 20篇 |
废物处理 | 16篇 |
环保管理 | 29篇 |
综合类 | 157篇 |
基础理论 | 98篇 |
环境理论 | 1篇 |
污染及防治 | 135篇 |
评价与监测 | 32篇 |
社会与环境 | 18篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 14篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 13篇 |
2017年 | 15篇 |
2016年 | 16篇 |
2015年 | 11篇 |
2014年 | 27篇 |
2013年 | 27篇 |
2012年 | 17篇 |
2011年 | 34篇 |
2010年 | 14篇 |
2009年 | 11篇 |
2008年 | 23篇 |
2007年 | 18篇 |
2006年 | 22篇 |
2005年 | 24篇 |
2004年 | 19篇 |
2003年 | 14篇 |
2002年 | 7篇 |
2001年 | 12篇 |
1999年 | 11篇 |
1998年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1992年 | 3篇 |
1989年 | 3篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1972年 | 2篇 |
1970年 | 3篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 3篇 |
1966年 | 3篇 |
1965年 | 11篇 |
1964年 | 4篇 |
1963年 | 5篇 |
1961年 | 3篇 |
1958年 | 6篇 |
1957年 | 8篇 |
1955年 | 4篇 |
1954年 | 2篇 |
1952年 | 2篇 |
1920年 | 4篇 |
1917年 | 3篇 |
1916年 | 6篇 |
排序方式: 共有508条查询结果,搜索用时 15 毫秒
331.
Joep P. M. Geraedts Joyce Harper Peter Braude Karen Sermon Anna Veiga Luca Gianaroli Noelle Agan Santiago Munné Sue Gitlin Elisabeth Blenow Kylie de Boer Nicole Hussey Emmanuel Kanavakis Soo-Huan Lee Stéphane Viville Lewis Krey Pierre Ray Serena Emiliani Yung Hsien Liu Stefan Vermeulen 《黑龙江环境通报》2001,21(12):1086-1092
An Erratum has been published for this article in Prenatal Diagnosis 22 (5) 2002, 451. Preimplantation genetic diagnosis (PGD) requires the combined efforts of geneticists and workers in the field of reproductive medicine. This was studied on the basis of a questionnaire, sent to 35 members of the PGD Consortium of the European Society of Human Reproduction and Embryology (ESHRE). A reply was obtained from 20 centres. They represent the majority of activities in the field of PGD in the world. It is obvious that many of the activities (in vitro fertilisation, embryo culture and biopsy) take place in IVF units while others (counselling and diagnosis) are the responsibility of genetic diagnostic centres. The distances between both units vary considerably. In all but one centre sex determination is offered. Aneuploidy screening is offered in 13 out of 20 centres. PGD of translocations and other structural chromosome abnormalities is offered in all but one centre. The number of monogenic diseases offered varies considerably. In comparison to prenatal diagnosis PGD is more expensive. The majority of these costs are due to the IVF or ICSI procedure. The charges for PGD vary between about € 600 and € 4000. In 16 out of 20 centres the parents to be must sign an informed consent form. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
332.
Nancy Steinberg Warren Shirley Soukup Jennifer L. King Peter St. J. Dignan 《黑龙江环境通报》2001,21(13):1111-1113
A case of prenatally diagnosed non-mosaic trisomy 20 in cells cultured from a chorionic villus sample (CVS)is presented. The term placental karyotype was also non-mosaic trisomy 20. The karyotype of thenewborn was 46,XY/47,XY,+20 in foreskin cultures and in a second skin culture; blood lymphocyte culture was 46,XY. Aside from diffuse, hypopigmentary swirls along the lines of Blaschko observed on hisextremities and trunk, referred to as hypomelanosis of Ito, the patient is clinically normal at 8¾ years ofage. In addition, he is one of the oldest reported cases of mosaic trisomy 20 confirmed after birth forwhich the clinical outcome has been monitored. This case demonstrates that these trisomy 20 findings are compatible with normal psychomotor development and phenotype. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
333.
Juliana Stéfani Jabur De Assis Valdemar Luiz Tornisielo Bianca A. B. Martins Roberto Estevão Bragion Toledo Ricardo Victória Filho 《Journal of environmental science and health. Part. B》2013,48(11):746-750
ABSTRACTIn Brazil, weed management in sugarcane fields is mainly done with the use of selective herbicide formulations. For many years, diuron+hexazinone was one of the main herbicide mixture formulations used in sugarcane. Later, sulfometuron-methyl was included in the same mixture, which was marketed as a new herbicide formulation for residual in-season weed control in sugarcane. The mixture diuron+hexazinone+sulfometuron-methyl has been widely used in commercial sugarcane fields in Brazil. However, recent field observations have shown that sugarcane plants at different growth stages varied in their phytotoxicity levels after treatment with diuron+hexazinone+sulfometuron-methyl. Greenhouse and laboratory studies were conducted to determine 14Csulfometuron-methyl absorption and translocation, as well as 14C distribution in sugarcane at two growth stages, 2 to 3 leaves and 5 to 6 leaves. 14Csulfometuron-methyl absorption by sugarcane did not differ between the two growth stages. Different patterns of 14C accumulation were observed, which may explain variations in sulfometuron-methyl phytotoxic responses observed in the field. 相似文献
334.
335.
336.
A preliminary assessment of renewable energy resources in Bulgaria shows that these resources are significant on a national level. Terminology for total, accessible, and reserve resources is provided, and preliminary estimates for solar, wind, biomass, hydroelectric, and geothermal resources are given. The process used to make a first-level selection of renewable energy technologies for further evaluation is described and an initial ranking of technologies for electricity generation, industry, and buildings is provided. 相似文献
337.
Leaf surface chemicals stimulating oviposition byPieris rapae (Lepidoptera: Pieridae) on cabbage 总被引:3,自引:0,他引:3
Summary The chemical stimulation of oviposition byPieris rapae on cabbage was investigated by leaf washing and extraction. Isolation of the stimulant by various chromatographic techniques was monitored by a bioassay using Sieva bean as a surrogate host plant. Cold water, chloroform, or chloroform followed by cold water washes failed to release the stimulant from leaf surfaces. Boiling water or chloroform followed by methanol was required. The most active stimulatory compound was identified as 3-indolylmethyl glucosinolate (glucobrassicin). Other glucosinolates were identified as sinigrin, which was only slightly active, and glucoiberin, which was completely inactive as a stimulant. The significance of the selective response ofP. rapae andP. brassicae to different glucosinolates and the implications of the binding of polar allelochemicals to leaf surfaces is discussed with respect to host utilization and perception mechanisms of pierids. 相似文献
338.
Most of cystic fibrosis (CF) pre-implantation genetic diagnosis (PGD) cases described to date are limited to the detection of ΔF508. Beside this predominant mutation, over 1000 mutations have been identified, rendering the development of a mutation-based PGD protocol impracticable. This is the reason why we, as well as the others, have developed PGD strategies on the basis of the identification of the pathogenic haplotype instead of the mutation(s). In a previous article, we reported the conditions for the co-amplification of two intragenic polymorphic markers and the F508 locus. Here we describe an improved protocol allowing the additional amplification of two new intragenic markers, intron 1 CA repeat (I1CA) and IVS17bTA. This new protocol should, theoretically, allow us to provide a diagnosis to all couples requiring PGD for CF. Using single lymphoblasts, we have tested four different PCR configurations, including one duplex, two triplexes and one quadruplex PCR. All of them gave results compatible with a clinical application. The number of single lymphoblasts tested in each series varied from 89 to 155. PCR efficiency ranged from 95.4 to 100%. A complete haplotype was achieved for 83.2 to 90.7% of the tested cells, with an allele drop out (ADO) rate comprised between 6.0 and 11.6%. We present here three cases that we performed either with the former test (one case using the triplex PCR combining F508, IVS8CA and IVS17bCA) or with the new one (one case using the triplex combining F508, I1CA and IVS17bTA and one case using a quadruplex test). We obtained two single pregnancies. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
339.
340.