全文获取类型
收费全文 | 289篇 |
免费 | 5篇 |
专业分类
林业 | 15篇 |
农学 | 12篇 |
36篇 | |
综合类 | 11篇 |
农作物 | 12篇 |
水产渔业 | 33篇 |
畜牧兽医 | 120篇 |
园艺 | 3篇 |
植物保护 | 52篇 |
出版年
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 12篇 |
2012年 | 19篇 |
2011年 | 23篇 |
2010年 | 7篇 |
2009年 | 13篇 |
2008年 | 19篇 |
2007年 | 29篇 |
2006年 | 9篇 |
2005年 | 21篇 |
2004年 | 25篇 |
2003年 | 16篇 |
2002年 | 17篇 |
2001年 | 6篇 |
2000年 | 8篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有294条查询结果,搜索用时 171 毫秒
191.
The largemouth bass is a sight feeder and one of the most popular freshwater fish for lure fishing. While lures a have variety of colors and forms, there is no information on the color vision and form perception in the largemouth bass. We recorded S-potentials from the isolate retinae of the largemouth bass to examine color vision electrophysiologically. The occurrence of the C-response provided direct evidence for the possession of color vision. L-responses recorded indicated a high spectral sensitivity to red. The direction and distance of lens movement of a specimen of 43 cm in fork length indicated a horizontal visual axis and the near point at 13.5 cm, respectively. The visual acuity calculated from the cone density and the focal distance of the lens was 0.10. Histological characteristics of the retina indicated that the eyes are well adapted to both form and movement perceptions. 相似文献
192.
Kanako Tsubono Yukio Taniguchi Hirokazu Matsuda Takahisa Yamada Toshie Sugiyama Kosuke Homma Yoshinori Kaneko Satoshi Yamagishi Hiroaki Iwaisaki 《Animal Science Journal》2014,85(4):356-364
Japanese population of the Japanese crested ibis Nipponia nippon was founded by five individuals gifted from the People's Republic of China. In order to exactly evaluate genetic structure, we first performed development of novel genetic makers using 89 microsatellite primer pairs of related species for cross‐amplification. Of these, only three primer pairs were useful for the genetic markers. Additionally, we sequenced allelic PCR products of these three markers together with 10 markers previously identified. Most markers showed typical microsatellite repeat units, but two markers were not simple microsatellites. Moreover, over half of the markers did not have the same repeat units as those of the original species. These results suggested that development of novel genetic markers in this population by cross‐amplification is not efficient, partly because of low genetic diversity. Furthermore, the cluster analysis by STRUCTURE program using 17 markers showed that the five founders were divided into two clusters. However, the genetic relationships among the founders indicated by the clustering seemed to be questionable, because the analysis relied largely on a small number of triallelic markers, in spite of the addition of the three useful markers. Therefore, more efficient methods for identifying large numbers of single nucleotide polymorphisms are desirable. 相似文献
193.
Inoue Yoshihiro Vy Trinh Thi Phuong Asuke Soichiro Matsuoka Yoshihiro Tosa Yukio 《Journal of General Plant Pathology》2021,87(4):201-208
Journal of General Plant Pathology - Wheat resistance genes Rwt3 and Rwt4 constitute a host-specificity barrier against non-wheat pathotypes of the blast fungus, Pyricularia oryzae. To understand... 相似文献
194.
195.
Yagi Y Ohnuma A Shiono H Chikayama Y Ito T 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(12):1355-1359
Eight splenectomized calves were inoculated with Theileria orientalis sergenti (Tos)-infected tick gland homogenate (5 calves) or infected erythrocyte suspension (3 calves). Clinical characteristics were different in calves post-infection. Animals were divided into 3 groups on the basis of susceptibility as high, middle, and low. Increase in mRNA of IFN-gamma, IL-2, and TNF-alpha was observed in peripheral blood mononuclear cells at the peak of infection and was seen to be related with pyrexia and parasitemia. Expression of IL-1, IL-4, and inducible nitric oxide synthase was not observed. Decreased plasma nitrite/nitrate level was observed in the groups. The results of this study indicate that Th1 response is the predominant response in Tos infection, and this response is also related with their clinical characteristics. 相似文献
196.
197.
198.
Okatani TA Ishikawa M Yoshida S Sekiguchi M Tanno K Ogawa M Horikita T Horisaka T Taniguchi T Kato Y Hayashidani H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(6):729-733
Automated ribotyping classified 70 Erysipelothrix species strains, previously classified into 14 RAPD patterns and into 63 PFGE patterns, into 27 ribogroups. Twenty-three strains of the 70 analyzed and classified into 13 ribogroups were previously classified into six ribotypes by the traditional ribotyping method. Moreover, automated ribotyping differentiated seven strains that were not differentiated by PFGE. Therefore, automated ribotyping was more sensitive than RAPD and traditional ribotyping, and it might be a useful method for a rapid screening in epidemiological study of strains of this genus, and more accurate results can be obtained when this method is used together with PFGE. 相似文献
199.
Takagi Y Sugita K Muto M Kato Y Kohzaki K Endo O Goto S 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(7):793-796
An alkaline decomposition method employing a KOH/alcohol solution was studied, and polynuclear aromatic hydrocarbons (PAHs) contained in particles remaining in canine lung were measured. As a result, BaA, BkF, BaP, and BghiP were found. By this method, PAHs extracted from the lungs of 32 dogs were 13.0-166.0 ng (mean, 63.0 ng) for BaA, 6.6-90.2 ng (mean, 27.4 ng) for BkF, 9.8-167.4 ng (mean 47.2 ng) for BaP, and 10.8-206.0 ng (mean, 61.8 ng) for BghiP. The results showed no correlation between the age and the concentration of PAHs in the lung, but some correlation was found between the age and the lung weight (p<0.01). There were significant correlations among the concentrations of the compounds in the lung (p<0.01). These results suggest that dogs, like humans, are affected by automobile exhaust and other common generation sources of such substances. 相似文献
200.