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排序方式: 共有67条查询结果,搜索用时 15 毫秒
41.
42.
R. H. Kloth 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1995,91(5):762-768
Pilose (T
1), a dominant marker in upland cotton, has been associated with coarse, short fibers. Pilose was, thereby, considered to be pleiotropic on fiber fineness and length. However, a pilose-expressing line with a fiber of average fineness was recently identified. This finding does not support pleiotropy between T
1 and fiber traits, but is indicative of linkage between pilose and loci influencing fiber characteristics. To understand the relationship between T
1 and fiber traits, a pilose line with short, coarse fiber was crossed to two t
1 lines with standard fiber characteristics. One hundred and forty-nine F2-derived F3 lines were developed from one cross, and 60 F2-derived F3 lines from the other. Seven fiber traits (elongation, maturity, micronaire reading, perimeter, 2.5% span length, strength, and wall thickness) were measured. Segregation was normal, as indicated by allelic frequencies of 0.5 for T
1 and t
1, and segregation ratios of 121 for marker genotypes. The association of homozygous T
1 lines with fibers of average fineness was again observed. Linkage between T
1 and loci affecting micronaire, perimeter, 2.5% span length, strength, and wall thickness was found in both populations. Significant additive and non-additive gene effects for each of these traits at the marker locus were found as well. The pilose marker accounted for 10–75% of the phenotypic variation associated with each trait. In conclusion, the t
1 locus is linked to numerous loci that influence fiber traits, and this linkage has previously been misinterpreted as pleiotropy. 相似文献
43.
López-Valenzuela BE Armenta-Bojórquez AD Hernández-Verdugo S Apodaca- Sánchez MA Samaniego-Gaxiola JA Valdez-Ortiz A 《Phyton》2019,88(1):37-46
Microbes that are beneficial to plants are used to
enhance the crop growth, yield and are alternatives to chemical
fertilizers. Trichoderma and Bacillus are the predominant plant
growth-promoting fungi and bacteria. The objective of this study
was select, characterize, and evaluate isolates of Trichoderma
spp. and Bacillus spp. native from the northern region of Sinaloa,
Mexico, and assess their effect on growth promotion in maize (Zea
mays L.). In greenhouse conditions, four Trichoderma isolates and
twenty Bacillus isolates, as well as two controls, were tested in a
completely randomized design with three replicates. We selected
the two best strains of Trichoderma and Bacillus: TB = Trichoderma
asperellum, TF = Trichoderma virens, B14 = Bacillus cereus sensu
lato and B17 = Bacillus cereus, which were evaluated in the field in
a completely randomized blocks in factorial arrangement design
with three replicates applying different rates of nitrogen fertilizer
(0, 150 kg N/ha, and 300 kg N/ha). Treatments 5 (B17 = B. cereus)
and 11 (TF = T. virens) both fertilized with 150 kg N/ha showed
similar yields and they did not reveal significant differences from
the treatments fertilized with 300 kg N/ha. This indicated that
treatment 5 (B17= B. cereus with 150 kg N/ha) and treatment
11 (TF= T. virens with 150 kg N/ha) were efficient as growth
promoters, by not showing significant differences in root volume
and dry weight of foliage. The results indicated a reduction of 50%
in the rate of nitrogen to fertilizer required for maize (Zea mays
L.) crops. These microorganisms Trichoderma and Bacillus could
be an alternative to reduce the use of chemical fertilizers in maize. 相似文献
44.
45.
46.
A technique for the preparation of plasmodesmata within a cell wall fraction of Solanum nigrum tissue homogenates has been developed, featuring good ultrastructural preservation of plasmodesmatal structure. SDS-PAGE of protein extracts of this plasmodesmata-containing cell wall fraction revealed the distinct enrichment of two bands, with molecular weights of 28 and 43 kD. 相似文献
47.
48.
Molecular evolutionary dynamics of cytochrome b in strepsirrhine primates: the phylogenetic significance of third-position transversions 总被引:3,自引:2,他引:1
DNA sequences of the complete cytochrome b gene are shown to contain robust
phylogenetic signal for the strepsirrhine primates (i.e., lemurs and
lorises). The phylogeny derived from these data conforms to other molecular
studies of strepsirrhine relationships despite the fact that uncorrected
nucleotide distances are high for nearly all intrastrepsirrhine
comparisons, with most in the 15%-20% range. Cytochrome b sequences support
the hypothesis that Malagasy lemuriforms and Afro-Asian lorisiforms each
comprise clades that share a sister- group relationship. A study (Adkins
and Honeycutt 1994) of the cytochrome c oxidase subunit II (COII) gene
placed one Malagasy primate (Daubentonia) at the base of the strepsirrhine
clade, thereby suggesting a diphyletic Lemuriformes. The reanalysis of COII
third- position transversions, either alone or in combination with
cytochrome b third-position transversions, however, yields a tree that is
congruent with phylogenetic hypotheses derived from cytochrome b and other
genetic data sets.
相似文献
49.
Michael T Kloth Andrew D Catling Corinne M Silva 《The Journal of biological chemistry》2002,277(10):8693-8701
50.
The minimum radial translocation rate of sugars has been determined from the starchaccumulation rate for the wood rays of Populus x canadensis Moench robusta, and related to ultrastructural peculiarities of the cell walls to be passed. The minimum radial flux or flow of sugars through the tangential walls, the pit fields, and per plasmodesma was 80.7 pmol · cm-2 · s-1, 400 to 800 pmol · cm-2 · s-1, and 1.0 to 1.7 · 10-7 pmol · plasmodesma-1 · s-1, respectively. These values exclude a transmembrane flux mechanism and indicate that the radial translocation in this tissue must proceed via plasmodesmata. In the isolation cells of the ray center we found 39 plasmodesmata per m2 of pit field, 8.0 per m2 of tangential wall, and 1.98% of the wall occupied by plasmodesmata. Cells of the ray margins show plasmodesmata on only 1.16% of their tangential wall area and thus appear to be slightly inferior for radial translocation. As judged from both the observed plasmodesmatal frequencies and the translocation rates, the ray parenchyma cells are comparable to cells specialized in short-distance translocation.Abbreviations CCR
contact-cell row
- IC
isolation cell
- ICR
isolation-cell row 相似文献