全文获取类型
收费全文 | 463篇 |
免费 | 25篇 |
国内免费 | 3篇 |
出版年
2023年 | 7篇 |
2022年 | 2篇 |
2021年 | 12篇 |
2020年 | 7篇 |
2019年 | 20篇 |
2018年 | 17篇 |
2017年 | 15篇 |
2016年 | 17篇 |
2015年 | 33篇 |
2014年 | 27篇 |
2013年 | 33篇 |
2012年 | 32篇 |
2011年 | 40篇 |
2010年 | 22篇 |
2009年 | 22篇 |
2008年 | 20篇 |
2007年 | 18篇 |
2006年 | 19篇 |
2005年 | 17篇 |
2004年 | 13篇 |
2003年 | 14篇 |
2002年 | 6篇 |
2001年 | 8篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1997年 | 4篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1969年 | 2篇 |
排序方式: 共有491条查询结果,搜索用时 921 毫秒
1.
E. A. Shahin R. Spivey 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1986,72(2):164-169
Summary Autotetraploids were established from 8 diploid wild species of section Arachis. In all the autotetraploids the chromosomes paired largely as bivalents even though they possess the ability to pair as multivalents. Pollen and pod fertility in the C1 generation were not directly associated with chromosome pairing. The C2 generation autotetraploids showed a gradual increase in bivalent associations and pollen and pod fertility. The identification of two genomes, A and B, in the diploid species and in the tetraploid, A. hypogaea, of the section Arachis, a fairly good crossability, and the type of chromosome associations observed in hybrids between A. hypogaea and the autotetraploids of wild Arachis species indicated good prospects of utilizing autotetraploids as genetic bridges in transferring desired traits from these taxa into groundnut.Submitted as Journal Article No. 516 by International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) 相似文献
2.
Treatment of newborn rats with clomiphene citrate during the first 5 days of life gave rise to a marked decrease in body mass and to a still greater decrease in gonadal mass. A decrease was also observed in the testicular diameter of the males. The females showed a 43% increase in their estradiol levels over the control and an increase in the sensitivity to gonadotropins. Thyroxine level, which was also determined in view of the known gonadotropin-thyrotropin overlap, showed no change 6 weeks after pretreatment with clomiphene, while the thyroid gland responded to gonadotropin in the same manner as to thyrotropin. 相似文献
3.
Md. Aktar-Uz-Zaman Md. Ariful Islam Md. Shahin Iqbal Md. Jahangir Alam Debashish Sarkar Bander Albogami Ahmed Gaber Akbar Hossain 《Phyton》2023,92(3):883-899
Ensuring food security for the rapidly increasing population and changing climatic scenarios are requisites for
exploiting the genetic divergence of food crops. A study was undertaken to sort out an early maturing chickpea
variety for fitting easily between rice-rice cropping systems in the Eastern Indo-Gangetic Plain of Bangladesh. The
trial was comprised of eight elite lines of chickpea and executed at various localities in Bangladesh from 2014–
15 to 2017–18. The result explored the chickpea genotype, BARI Chola-11 remained superior to the rest of
the elite genotypes for having a short maturity period (100–106 days), and lesser days to 50% flowering (47–
55 days). The same genotype was recorded to have robust vegetative and reproductive yield attributes including
plant height (49–57 cm), podsplant−1 (37–50), and optimum 100 seed weight (19.5–20.6 g). Owing to better yield
attributes, BARI Chola-11 resulted in the maximum seed yield (1200–1500 kg ha−1
) of chickpea and might be
recommended for general adoption in the region for boosting nutritional security status through improved productivity under changing climate. 相似文献
4.
M Delbos N Saidi J D Gipouloux 《Archives d'anatomie microscopique et de morphologie expérimentale》1982,71(2):89-98
A study of primordial germ cells (PGC) of Amphibia Anura was carried out after treatment of sections by different fluorescein isothiocyanate conjugated lectins (FITC-lectins). Specific labelling on the PGC is obtained with lectins, the activity of which is inhibited by D-galactose or N-acetyl-galactosamine. These osidic groups appear to be located more specifically on the PGC. The same labelling pattern is not obtained with lectins possessing major affinity for mannose, glucose, fucose and N-acetyl-glucosamine. Furthermore, changes in labelling pattern are observed during migration of PGC. It is suggested that D-galactose and N-acetyl-galactosamine might be related to membrane activity of PGC during migration. Ultrastructural study of the visualization of cell surface carbohydrates supplies some information on the localisation of these lectins receptors. 相似文献
5.
AH 22216 is a new histamine-H2-receptor antagonist which possesses a triazole ring. When compared to cimetidine, AH 22216 is about 100 times more potent (Ki = 0.21×10–8 M) in inhibiting histamine-stimulated acid secretion in isolated rabbit gastric cells. These two antihistamines have no effect on carbachol-stimulated acid secretion in the system. The data indicate that AH 22216 interacts directly and specifically on the gastric H2-receptor of the parietal cell and are consistent with the reported pharmacological potencies of AH 22216 and cimetidine on histamine-induced gastric-acid secretion in vivo. AH 22216 could thus be a useful therapeutic agent in patients with peptic ulcers. 相似文献
6.
Teymouri Babak Ghiasi Ghalehkandi Jamshid Hassanpour Shahin Aghdam-Shahryar Habib 《International journal of peptide research and therapeutics》2020,26(1):381-387
International Journal of Peptide Research and Therapeutics - The aim of the current study was to determine effect of in ovo feeding of vitamin B12 on hatchability, growth performance and blood... 相似文献
7.
Brooke W. Bullington Katherine Klemperer Keith Mages Andrea Chalem Humphrey D. Mazigo John Changalucha Saidi Kapiga Peter F. Wright Maria M. Yazdanbakhsh Jennifer A. Downs 《PLoS pathogens》2021,17(5)
Although a growing number of studies suggest interactions between Schistosoma parasites and viral infections, the effects of schistosome infections on the host response to viruses have not been evaluated comprehensively. In this systematic review, we investigated how schistosomes impact incidence, virulence, and prevention of viral infections in humans and animals. We also evaluated immune effects of schistosomes in those coinfected with viruses. We screened 4,730 studies and included 103. Schistosomes may increase susceptibility to some viruses, including HIV and Kaposi’s sarcoma-associated herpesvirus, and virulence of hepatitis B and C viruses. In contrast, schistosome infection may be protective in chronic HIV, Human T-cell Lymphotropic Virus-Type 1, and respiratory viruses, though further research is needed. Schistosome infections were consistently reported to impair immune responses to hepatitis B and possibly measles vaccines. Understanding the interplay between schistosomes and viruses has ramifications for anti-viral vaccination strategies and global control of viral infections. 相似文献
8.
Pooneh Saidi Mahdi Sadeghi Claudio Tenreiro 《Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)》2013,29(3):286-294
Monte Carlo simulations and TLD dosimetry have been performed to determine the dose distributions along the central axis of the 12 mm COMS eye plaques loaded with IRA1-103Pd seeds. Several simulations and measurements have been employed to investigate the effect of Silastic insert and air in front of the eye on dosimetry results along the central axis of the plaque and at some critical ocular structures. Measurements were performed using TLD-GR200A circular chip dosimeters in a PMMA eye phantom. The central axis TLD chips locations were arranged in one central column of eye phantom, in 3 mm intervals. The off-axis TLD chips locations were arranged in three off-axis columns around the central axis column. Version 5 of the MCNP code was also used to evaluate the dose distribution around the plaque. The presence of the Silastic insert results in dose reduction of 14% at 5 mm; also about 7% dose reduction appears at the interface point, due to the air presence and lack of the scattering condition. The overall dosimetric parameters for the COMS eye plaque loaded with new palladium seeds are similar to a commercial widely used seed such as Theragenics200. As the dose calculations under TG-43 assumptions do not consider the effect of the plaque backing and Silastic insert for accurate dosimetry, it's suggested to apply the effect of the eye plaque materials and air on dosimetry results along the central axis of the plaque and at some critical ocular structures. 相似文献
9.
10.
Saidi H. Kapiga Fiona M. Ewings Tony Ao Joseph Chilongani Aika Mongi Kathy Baisley Suzanna Francis Aura Andreasen Ramadhan Hashim Deborah Watson-Jones John Changalucha Richard Hayes 《PloS one》2013,8(7)