全文获取类型
收费全文 | 48篇 |
免费 | 9篇 |
专业分类
基础科学 | 1篇 |
综合类 | 12篇 |
水产渔业 | 3篇 |
畜牧兽医 | 40篇 |
植物保护 | 1篇 |
出版年
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 6篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2004年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有57条查询结果,搜索用时 0 毫秒
51.
对海刺猬Glyptocidaris crerularis和中间球海胆Stronylocentrotus intermedius性腺的组织学和组织化学进行了比较研究。结果表明,两者性腺结构均为滤泡型,滤泡由生殖细胞和营养细胞组成,随着生殖细胞的发育成熟,营养细胞中颗粒逐渐减少,当生殖细胞排放后,营养颗粒的数量逐渐增加,且中间球海胆的营养颗粒数量较海刺猬多。观察和分析了海刺猬和中间球海胆的雌、雄生殖细胞、营养颗粒、滤泡细胞的DNA、RNA、多糖、蛋白质和结合脂类的分布、数量及其变化,发现中间球海胆滤泡中营养颗粒的多糖和蛋白质含量比海刺猬高,其它指标两者都很相近。 相似文献
52.
BZ Yang CY Yang RC Li GS Qin XF Zhang CY Pang MT Chen FX Huang Z Li HY Zheng YJ Huang XW Liang 《Reproduction in domestic animals》2010,45(5):e21-e25
The aim of this study was to explore the feasibility of cryopreservation of inter‐subspecies cloned embryos in buffalo. In our experiment, river buffalo ear fibroblast nucleus was fused into swamp buffalo oocyte cytoplasm. The blastocyst formation rate for nuclear transfer of freshly thawed cells was not different from those of growing cells, confluent or serum‐starved cells. A total of 122 cloned blastocysts derived from cryopreserved fibroblasts were cryopreserved and thawed, 37 were survived, the cryosurvival rate was 30.3%. The survived blastocysts were transferred into 15 recipient buffalos. Five of the recipients established pregnancy, but four of them aborted on day 53, 59, 145 and 179 of gestation respectively. One cross‐bred buffalo (Murrah × Swamp buffalo (2n = 49) received three embryos delivered a 40.5 kg female calf by natural delivery on day 320 of gestation. Up to now (13‐month old), the cloned calf has been growing well with no abnormity observed. These results demonstrated that cryopreservation of inter‐subspecies cloned embryos is feasible to produce buffalo offspring. 相似文献
53.
54.
55.
Ultrasonic interferometric measurements, developed for polycrystalline samples in a multi-anvil apparatus, were extended to single-crystal samples of San Carlos olivine and forsterite. The elastic moduli, C22 and C55 of San Carlos olivine and C55 of pure forsterite, were measured to about 13 gigapascals. These data on C22 for San Carlos olivine and C55 for forsterite are consistent with earlier measurements and extrapolations. The C55 for San Carlos olivine increases linearly as a function of increasing pressure, unlike the earlier nonlinear behavior observed at high pressure with impulsive stimulated scattering techniques. 相似文献
56.
A Seiff DB Kirk TCD Knight LA Young FS Milos E Venkatapathy JD Mihalov RC Blanchard RE Young G Schubert 《Science (New York, N.Y.)》1997,276(5309):102-104
Temperatures in Jupiter's atmosphere derived from Galileo Probe deceleration data increase from 109 kelvin at the 175-millibar level to 900 ± 40 kelvin at 1 nanobar, consistent with Voyager remote sensing data. Wavelike oscillations are present at all levels. Vertical wavelengths are 10 to 25 kilometers in the deep isothermal layer, which extends from 12 to 0.003 millibars. Above the 0.003-millibar level, only 90- to 270- kilometer vertical wavelengths survive, suggesting dissipation of wave energy as the probable source of upper atmosphere heating. 相似文献
57.
RC Bohrer PRA Rosa R Ferreira V Bordignon JFC Oliveira PBD Gonçalves 《Reproduction in domestic animals》2013,48(3):396-401
The growth factor receptor‐bound protein 14 (Grb14) is a cellular adapter protein belonging to the Grb7 family of proteins. Studies with human and rodent cells have demonstrated that Grb14 acts as a negative regulator of tyrosine kinase receptor signalling through the MAPK and PI3K pathways. In cattle, tyrosine kinase receptors are activated during follicular development but the role of Grb14 in this process has not yet been investigated. Therefore, the aim of the present study was to characterize Grb14 mRNA expression in ovarian somatic cells during follicular growth and deviation in cattle. We found Grb14 mRNA expressed in both granulosa and theca cells derived from follicles at different stages of development (3–5 , 6–8, >8 mm in diameter). The abundance of mRNA for Grb14 was higher in granulosa cells of subordinate compared with those from dominant follicles at days 3 and 4 of the follicular wave (p < 0.05). Further, there was a negative correlation between the abundance of mRNA for Grb14 and P450Arom in granulosa cells (R2 = 0.367; p < 0.05) and between the abundance of mRNA for Grb14 in granulosa cells and concentration of oestradiol in follicular fluid (R2 = 0.545; p < 0.05). In theca cells, the expression of Grb14 mRNA did not differ between dominant and subordinate follicles (p > 0.05). These findings suggest that Grb14 may play a regulatory role in granulosa cells during follicular deviation in cattle. 相似文献