全文获取类型
收费全文 | 148篇 |
免费 | 14篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 7篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 8篇 |
2006年 | 11篇 |
2005年 | 6篇 |
2004年 | 10篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1977年 | 2篇 |
1973年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有162条查询结果,搜索用时 31 毫秒
161.
RB Marchase 《The Journal of cell biology》1977,75(1):237-257
The preferential adhesion of chick neural retina cells to surfaces of intact optic tecta has been investigated biochemically. The study uses a collection assay in which single cells from either dorsal or ventral halves of neural retain adhere preferentially to ventral or dorsal halves of optic tecta respectively. The data presented support the following conclusions: (a) The adhesion of ventral retina to dorsal tecta seems to depend on proteins located on ventral retina and on terminal β-N-acetylgalactosamine residues on dorsal tecta. (b) The adhesion of dorsal retina to ventral tecta seems to depend on proteins located on ventral tecta and on terminal β- N-acetylgalactosamine residues on dorsal retina. (c) A double gradient model for retinotectal adhesion along the dorsoventral axis is consistent with the data presented. The model utilizes only two complementary molecules. The molecule suggested to be concentrated dorsally in both retina and tectum seems to require terminal β-N-acetylgalactosamine residues for adhesion. Its activity is not affected by protease. A molecule fitting these qualifications, the ganglioside GM(2), could not be detected in a gradient, but lecithin vesicles containing GM(2) adhered preferentially to ventral tectal surfaces. The second molecule, concentrated ventrally in both retina and tectum, is a protein and seems capable of binding terminal β-N- acetylgalactosamine residues. One enzyme, UDP-galactose:GM(2) galactosyltransferase, has been found to be more concentrated in ventral retina than dorsal, but only by 30 percent. 相似文献
162.
Analysis of genetic diversity among persimmon cultivars using microsatellite markers 总被引:2,自引:0,他引:2
Maria del Mar Naval Elena Zuriaga Simona Pecchioli Gerardo Llácer Edgardo Giordani María Luisa Badenes 《Tree Genetics & Genomes》2010,6(5):677-687
In the Mediterranean area, the production of persimmon (Diospyros kaki Thumb) [2n = 6x = 90] has increased recently as an alternative to the major fruit crops. In Spain, production relies almost exclusively on
the cultivar “Rojo Brillante” which accounts for 83% of the crop. A crop based on a monovarietal culture implies several commercial
risks that can compromise the future of the crop. Although the species was introduced in Europe very recently, it is well
adapted to the climate of southern Europe. However, the recent introduction from Japan, the mistakes on the identity of varieties
in the collections due to a bad translation of variety names from Japanese, and the lack of genetic characterization of many
varieties have caused difficulties for effective management of the available genetic resources. The present paper was aimed
at exploring the genetic diversity among different persimmon cultivars, including those collected in the European survey as
well as Japanese cultivars. Seventy-one persimmon cultivars coming from two European collections that included accessions
from Japan, Italy, and Spain were analyzed using 19 polymorphic microsatellite markers. A total of 206 alleles were obtained,
with a mean value of 10.8 alleles per locus. A neighbor joining dendrogram and a principal coordinate analysis arranged the
cultivars according to their genetic relationships. Analysis of molecular variance revealed significant genetic variability
between and within groups, 73.3% and 85.2% for astringent-type and country origin, respectively. The simple sequence repeat
markers classified the persimmon cultivars according to their genetic relationship. 相似文献