全文获取类型
收费全文 | 127篇 |
免费 | 10篇 |
专业分类
林业 | 11篇 |
农学 | 5篇 |
基础科学 | 2篇 |
14篇 | |
综合类 | 10篇 |
农作物 | 2篇 |
水产渔业 | 11篇 |
畜牧兽医 | 71篇 |
园艺 | 2篇 |
植物保护 | 9篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 3篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 1篇 |
2009年 | 6篇 |
2008年 | 12篇 |
2007年 | 6篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 10篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1970年 | 3篇 |
1939年 | 1篇 |
1860年 | 1篇 |
排序方式: 共有137条查询结果,搜索用时 15 毫秒
1.
Ed. Afterberg 《European Journal of Forest Research》1860,4(1):439-441
Ohne Zusammenfassung 相似文献
2.
Eric Klaphake Ahmed Shoieb Ed Ramsay Juergen Schumacher Linden Craig 《Journal of zoo and wildlife medicine》2005,36(1):127-130
A 19-yr-old binturong (Arctictis binturong) with acute upper respiratory disease was euthanized. Postmortem findings included hepatocellular carcinoma, pancreatic islet cell carcinoma, and renal adenocarcinoma with metastasis to the spleen, pleura, and pericardium. A link between primary hepatic and renal neoplasms has been noted in older humans. 相似文献
3.
Henneguya pilosa sp. n., a new species of myxosporean from the gill filaments of the white piranha, Serrasalmus altuvei Ramirez, 1965 (Characidae), a freshwater teleost fish collected in the Zoological Garden of the city of Teresina (Piauí), Brazil, is described from light and transmission electron microscope observations. This myxosporean produced small plasmodia (up to 0.2 mm in diameter), each one containing all life-cycle stages of the parasite, including numerous spores. The spores, laterally compressed, averaged 54.2 (52.3-56.0) microm in total length and consisted of two unequal valves adhering together along the suture line and two caudal processes. The spore body measured 21.1 (20.0-23.1) microm in length, 5.9 (5.5-6.3) microm in width, and 2.2 (1.9-2.6) microm in thickness. The two equal ellipsoidal polar capsules of 7.4 (7.1-7.6) microm long and 1.2 (1.0-1.3) microm wide possessed a polar filament with 11-12 (rarely 13) turns. All surfaces of the spores were covered with a tightly adherent complex network of numerous densely ramified granulo-fibrillar masses, the longest measuring 1.5 microm long, observed around the caudal processes. The prevalence of infection was 30%. The taxonomic affinities of this parasite with other of the same genus in freshwater South American fish species are discussed. 相似文献
4.
5.
6.
7.
9.
10.
Claire N. Lieske James H. Clark Howard G. Meyer Leigh Boldt Martin D. Green John R. Lowe Walter E. Sultan Peter Blumbergs Matthew A. Priest 《Pesticide biochemistry and physiology》1984,22(3):285-294
The inhibition of eel acetylcholinesterase by the 4-nitrophenyl esters of 2-furyl(methyl)-, methyl(2-thienyl)-, di-2-furyl-, and di-2-thienylphosphinic acid (I, II, III, and IV, respectively) was investigated at pH 6.90 in 0.067 M phosphate buffer (25.0°C) using stopped-flow instrumentation and automated data processing. Our evaluation of the dissociation constant, Kd, the unimolecular bonding rate constant, k2, and the bimolecular reaction constant, ki, are the first reported values for these constants for alkyl/heteroaryl and diheteroaryl esters of phosphinic acids. The largest ki value (19,330 M?1 sec?1) was observed for the reaction of I with the enzyme. The order for the remaining three is II > IV > III. There is no direct relationship between the hydrolysis rates of the esters and their anticholinesterase activities on eel acetylcholinesterase. Likewise, there is no direct relationship between their anticholinesterase activities and the LD50 values in rats. 相似文献