全文获取类型
收费全文 | 5371篇 |
免费 | 323篇 |
国内免费 | 4篇 |
专业分类
林业 | 269篇 |
农学 | 244篇 |
基础科学 | 9篇 |
1002篇 | |
综合类 | 628篇 |
农作物 | 587篇 |
水产渔业 | 424篇 |
畜牧兽医 | 2129篇 |
园艺 | 74篇 |
植物保护 | 332篇 |
出版年
2023年 | 29篇 |
2022年 | 89篇 |
2021年 | 116篇 |
2020年 | 99篇 |
2019年 | 110篇 |
2018年 | 138篇 |
2017年 | 161篇 |
2016年 | 186篇 |
2015年 | 167篇 |
2014年 | 200篇 |
2013年 | 288篇 |
2012年 | 351篇 |
2011年 | 418篇 |
2010年 | 224篇 |
2009年 | 232篇 |
2008年 | 320篇 |
2007年 | 301篇 |
2006年 | 270篇 |
2005年 | 248篇 |
2004年 | 234篇 |
2003年 | 189篇 |
2002年 | 204篇 |
2001年 | 144篇 |
2000年 | 119篇 |
1999年 | 79篇 |
1998年 | 47篇 |
1997年 | 22篇 |
1996年 | 24篇 |
1995年 | 24篇 |
1993年 | 25篇 |
1992年 | 29篇 |
1991年 | 28篇 |
1990年 | 36篇 |
1989年 | 39篇 |
1988年 | 32篇 |
1987年 | 40篇 |
1986年 | 18篇 |
1985年 | 32篇 |
1984年 | 23篇 |
1983年 | 27篇 |
1981年 | 19篇 |
1980年 | 15篇 |
1978年 | 21篇 |
1977年 | 19篇 |
1976年 | 28篇 |
1975年 | 14篇 |
1974年 | 20篇 |
1973年 | 22篇 |
1972年 | 22篇 |
1971年 | 15篇 |
排序方式: 共有5698条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
The in vitro metabolism of the chiral isomers of fonofos and fonofos oxon in the presence of mouse liver mixed-function oxidase and serum esterase was investigated. The metabolism of 35S-labeled phenyl-(S)P-fonofos mediated by mixed-function oxidase took place stereoselectively, resulting predominantly in (R)P-fonofos oxon. Similarly, (R)P-fonofos was converted to (S)P-oxon. In each case, however, a significant amount of racemization occurred. Other products were diphenyl disulfide and diphenyl disulfide oxide. In addition to stereospecificity, the oxidative metabolism of (R)P-fonofos proceeded at a rate faster than that of (S)P-fonofos. Stereoselective rate differences also were observed in mouse or rat serum-catalzyed degradation of the fonofos oxon enantiomers, the (S)P isomer being degraded about twofold faster than its enantiomer. The differences in toxicities of the isomers of fonofos and fonofos oxon were consistent with the in vitro metabolism data. 相似文献
5.
6.
Hyun-Soo Kim Jun-Geon Je Hyesuck An Kyunghwa Baek Jeong Min Lee Mi-Jin Yim Seok-Chun Ko Ji-Yul Kim Gun-Woo Oh Min-Cheol Kang Young Min Ham You-Jin Jeon Dae-Sung Lee 《Marine drugs》2022,20(8)
Ecklonia maxima is a brown seaweed, which is abundantly distributed in South Africa. This study investigated an efficient approach using high-performance centrifugal partition chromatography (HPCPC), which has been successfully developed for the isolation and purification of phlorotannins, eckmaxol, and dieckol from the ethyl acetate fraction of E. maxima (EEM). We evaluated EEM for its inhibitory effect against lipopolysaccharide (LPS)-induced inflammatory responses in zebrafish embryos. The separation of eckmaxol and dieckol from samples of EEM using HPCPC was found to be of high purity and yield under an optimal solvent system composed of n-hexane:ethyl acetate:methanol:water (2:7:3:7, v/v/v/v). To evaluate the anti-inflammatory efficacy of EEM containing active compounds, zebrafish embryos exposed to LPS were compared with and without EEM treatment for nitric oxide (NO) production, reactive oxygen species (ROS) generation, and cell death two days after fertilization. These evaluations indicate that EEM alleviated inflammation by inhibiting cell death, ROS, and NO generation induced by LPS treatment. According to these results, eckmaxol and dieckol isolated from brown seaweed E. maxima could be considered effective anti-inflammatory agents as pharmaceutical and functional food ingredients. 相似文献
7.
A chemical investigation of a methanol extract of Spongia sp., a marine sponge collected from the Philippines, identified 12 unreported scalarane-type alkaloids—scalimides A–L (1–12)—together with two previously described scalarin derivatives. The elucidation of the structure of the scalaranes based on the interpretation of their NMR and HRMS data revealed that 1–12 featured a β-alanine-substituted E-ring but differed from each other through variations in their oxidation states and substitutions occurring at C16, C24, and C25. Evaluation of the antimicrobial activity of 1–12 against several Gram-positive and Gram-negative bacteria showed that 10 and 11 were active against Micrococcus luteus and Bacillus subtilis, respectively, with MIC values ranging from 4 to 16 μg/mL. 相似文献
8.
9.
Grisel Ponciano Masayasu Yoshikawa Jamie L. Lee Pamela C. Ronald Maureen C. Whalen 《Physiological and Molecular Plant Pathology》2006,69(4-6):131-139
Disease resistance mediated by the resistance gene Xa21 is developmentally controlled in rice. We examined the relationship between Pathogenesis Related (PR) defense gene expression and Xa21-mediated developmental disease resistance induced by Xanthomonas oryzae pv. oryzae (Xoo). OsPR1a, OsPR1b, and OsPR1c genes were cloned and their induction was analyzed, in addition to the OsPR10a gene, at the juvenile and adult stages in response to a wildtype Xoo strain that induces a resistance response (incompatible interaction) and an isogenic mutant Xoo strain that does not (compatible interaction). We found that the adult stage leaves are more competent to express these OsPR1 genes and that the Xa21 locus is required for the highest levels of induction. 相似文献
10.