全文获取类型
收费全文 | 60篇 |
免费 | 2篇 |
国内免费 | 4篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 8篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1988年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有66条查询结果,搜索用时 15 毫秒
61.
Lycoris sprengeri Comes ex Baker is endemic to China. Reported in the present
paper are the chromosomes number and karyotypes for two wild populations of the species
from Anhui. ( 1 )Caishi population has a karyotype 2n=33=9st+21t+3T. The length of
chromosomes ranges from 5.58~9.15μm. The karyotype belongs to Stebbin’s (1971)
“4A”. (2)Longyashan populations have two karyotypes. The karyotype formula of the type
I is 2n=22=8st+14t, with chromosomes ranging from 6.88~9.15μm. The karyotype
belongs to “4A”. The karyotype formula of the type Ⅱ is 2n=22=1m+1sm+14st+6t,
with chromosomes ranging from 7.20~15.80μm. The karyotype belongs to “3B”. The
triploid type of L. sprengeri was discovered in Anhui for the first time. The karyotype 2n=22 =1m+1sm+14st+6t in diploid type of this species is here reported for the first time.The Robertsonian change plays a key role in karyotype evolution of Lycoris. 相似文献
62.
本文对采自海南省细须螨科,1913、细须螨属,1875的种,儋县细须螨,新种Tenuipalpus danxianensis sp.nov.和三亚细须螨,新种Tenuipalpus sanyaensis sp。nov。进行详细功述,并与近种进行了比较,模式标本保存在沈阳农业大学植保系。 相似文献
63.
C. A. stepien 《Molecular ecology》1999,8(6):923-939
Population genetic variability and phylogeographical structure of the Dover sole, Microstomus pacificus (Teleostei: Pleuronectidae), were examined along the continental slope of the north-eastern Pacific Ocean using sequences of the left domain of the mitochondrial DNA (mtDNA) control region. Six sites were sampled in three primary biogeographical provinces (based on surface water temperatures), ranging from the subarctic to the warm temperate zones. Many haplotypes were discerned, totalling 90 for 110 individuals. Neighbour joining and parsimony analyses of the entire data set showed that some groups of haplotypes of adult Dover sole were widely distributed, suggesting either panmixia or homoplasy and reversals. However, a substantial number of groups of related haplotypes were geographically circumscribed, and there were significant differences among sites in the distribution of restricted haplotypes (based on a reduced number of characters), supporting geographical structure. Geographical differentiation of populations appeared to be consistent with the member-vagrant hypothesis for retention of the pelagic larvae in currents and recruitment to adult habitats, reducing long-distance dispersal. Results of this study indicate phylogeographical structure among some populations, despite extended pelagic larval periods, and apparent environmental homogeneity in the adult habitats along the continental slope. 相似文献
64.
65.
Biometrical variability of foliage, cones, and seeds were analyzed in 8 native populations (throughout the range) of a relictual species,Cupressus bakeri
Jeps. (Cupressaceae) from California and Oregon. The partition of variation within and among populations for this rare plant was investigated and the justification for subspecies status was reviewed. Morphological characters varied significantly, with more of the variation among populations than at the population level. Multivariate analyses indicated close affinities among populations on serpentine sites suggesting the presence of a serpentine race. However, the high degree of variation among populations did not permit their clear separation into the two subspecies described byWolf (1948). We conclude thatC. bakeri should be treated as a monotypic species. 相似文献
66.
Françoise Beucher 《Cellular immunology》1982,74(2):334-344
Syngeneic proliferative response of splenic T cells against monolayers of epidermal basal cells (EBC) was obtained with C57BL/6 and DBA/2 mice. Optimal response, as assessed by [3H]thymidine uptake, occurred on the 6th day of coculture. The level of [3H]thymidine uptake by unseparated spleen cells was lower than by fractionated T cells from C57BL/6 mice, and null for DBA/2 mice. It was not significantly different when lymphocytes were cocultured with syngeneic or allogeneic epidermal cells. Ia antigens did not appear to be involved in the syngeneic response, since it was not prevented by pretreating stimulator monolayers with monoclonal anti-Iak antibody or by adding this antibody directly to the cultures. When the proliferative responses of separated Lyt 1+ and Lyt 2+ cell subsets were compared, the prominent role of Lyt 1+ cells was demonstrated. Enhancement of the T-cell reactivity by eliminating Lyt 2+ cells and suppression of the response of a constant number of Lyt 1+ cells by adding Lyt 2+ cells suggested that Lyt 2+ cells could suppress and modulate the Lyt 1+ cell proliferation. 相似文献