全文获取类型
收费全文 | 663篇 |
免费 | 38篇 |
专业分类
701篇 |
出版年
2024年 | 4篇 |
2023年 | 9篇 |
2022年 | 27篇 |
2021年 | 44篇 |
2020年 | 18篇 |
2019年 | 22篇 |
2018年 | 21篇 |
2017年 | 18篇 |
2016年 | 24篇 |
2015年 | 30篇 |
2014年 | 41篇 |
2013年 | 55篇 |
2012年 | 53篇 |
2011年 | 39篇 |
2010年 | 22篇 |
2009年 | 27篇 |
2008年 | 22篇 |
2007年 | 27篇 |
2006年 | 26篇 |
2005年 | 20篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1979年 | 3篇 |
1976年 | 2篇 |
1974年 | 2篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1969年 | 4篇 |
1968年 | 1篇 |
1966年 | 2篇 |
1964年 | 2篇 |
1959年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有701条查询结果,搜索用时 15 毫秒
691.
692.
693.
Biochemical Decomposition of the Herbicide N-(3,4-Dichlorophenyl)-2-Methylpentanamide and Related Compounds 总被引:4,自引:4,他引:0 下载免费PDF全文
Organisms capable of decomposing N-(3,4-dichlorophenyl)-2-methylpentanamide (Karsil) were isolated, identified, and tested for their ability to hydrolyze this herbicide. Primary products of Karsil decomposition by cells and cell-free extracts of a Penicillium sp. were identified as 2-methyl-valeric acid and 3,4-dichloroaniline. The Karsil acylamidase (EC 3.5.1.a aryl acylamine amidohydrolase) was an induced enzyme. It was partially purified and tested for its ability to hydrolyze 25 related compounds. Some relations between the structures of these compounds and their susceptibility to enzymatic hydrolysis were discerned. 相似文献
694.
Russian Journal of Bioorganic Chemistry - VEGFR-2 inhibition represents an attractive strategy for anticancer drug design. A new series of quinoline derivatives were synthesized and structurally... 相似文献
695.
Khalid M. Badr El-Din Hesham Salem Sayed Derayea Amany Abdelaziz Dalia M. Nagy 《Luminescence》2023,38(9):1583-1590
A spectrofluorimetric approach that is sensitive, simple, validated, and cost-effective has been proposed for the estimation of amlodipine (AML) and perindopril (PER) in their bulk powders, pharmaceutical formulations, and spiked human plasma. The recommended approach utilized the quantitative quenching effect of the two cited drugs on the fluorescence intensity of erythrosine B, as a result of complex binary reactions among each drug with erythrosine B at pH 3.5 (Teorell and Stenhagen buffer). The quenching of erythrosine B fluorescence was recorded at 554 nm after excitation at 527 nm. The calibration curve was detected in the range 0.25–3.0 μg ml−1, with a correlation coefficient of 0.9996 for AML, and 0.1–1.5 μg ml−1, with a correlation coefficient of 0.9996 for PER. The established spectrofluorimetric approach was validated for the estimation of the cited drugs with high sensitivity regarding International Council on Harmonization guidelines. Therefore, the established approach could be utilized for quality control of the cited drugs in their pharmaceutical formulations. 相似文献
696.
697.
Al Farraj Dunia A. Hadibarata Tony Yuniarto Adhi Syafiuddin Achmad Surtikanti Hertien Koosbandiah Elshikh Mohamed Soliman Al Khulaifi Manal M. Al-Kufaidy Roua 《Bioprocess and biosystems engineering》2019,42(6):963-969
Bioprocess and Biosystems Engineering - Polycyclic aromatics hydrocarbons (PAHs) are ubiquitous and toxic pollutants that are dangerous to humans and living organism in aquatic environment.... 相似文献
698.
In this paper, the preparation, characterization and dye adsorption properties of nanocomposite (calcium alginate/organophilic montmorillonite) (CA/OMMT) were investigated. A new nanocomposite consisting of alginate and OMMT was prepared by polymerization using γ-rays irradiation as initiator. Physical characteristics of CA/OMMT were studied using X-ray diffraction (XRD), infrared spectrophotometery (IR), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED). Two textile dyes, acid green B and direct pink 3B, were used as model anionic dye. Factors affecting dye sorption, such as pH, sorbent concentration and temperature of each dye solution were extensively investigated. It was found from the study that the sorption of dyes by the nanocomposite is pH-dependent and maximum sorption was obtained at pH 2. The thermodynamic data showed that dye adsorption onto alginate was spontaneous, exothermic, and a physisorption reaction. On the basis of the data of the present investigation, one could conclude that the as-prepared adsorbents exhibited excellent affinity for the dye, and can be applied to treat wastewater containing anionic dyes. 相似文献
699.
700.