全文获取类型
收费全文 | 959篇 |
免费 | 31篇 |
国内免费 | 61篇 |
专业分类
林业 | 104篇 |
农学 | 146篇 |
基础科学 | 15篇 |
63篇 | |
综合类 | 378篇 |
农作物 | 127篇 |
水产渔业 | 40篇 |
畜牧兽医 | 126篇 |
园艺 | 43篇 |
植物保护 | 9篇 |
出版年
2024年 | 1篇 |
2023年 | 6篇 |
2022年 | 10篇 |
2021年 | 16篇 |
2020年 | 21篇 |
2019年 | 14篇 |
2018年 | 2篇 |
2017年 | 19篇 |
2016年 | 29篇 |
2015年 | 20篇 |
2014年 | 41篇 |
2013年 | 43篇 |
2012年 | 44篇 |
2011年 | 83篇 |
2010年 | 64篇 |
2009年 | 59篇 |
2008年 | 89篇 |
2007年 | 79篇 |
2006年 | 69篇 |
2005年 | 43篇 |
2004年 | 28篇 |
2003年 | 44篇 |
2002年 | 30篇 |
2001年 | 17篇 |
2000年 | 25篇 |
1999年 | 21篇 |
1998年 | 14篇 |
1997年 | 16篇 |
1996年 | 11篇 |
1995年 | 16篇 |
1994年 | 17篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 10篇 |
1990年 | 8篇 |
1989年 | 12篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1963年 | 1篇 |
排序方式: 共有1051条查询结果,搜索用时 31 毫秒
51.
本文研究了中棉(Gossypium arboreum race sinense)与纳尔逊氏棉(G. nelsonii Fryx) 种间杂种F1的一些形态性状的遗传变异及花粉母细胞减数分裂的染色体行为。杂种一代呈筒形,全株密集如毡的绒毛,叶片缺刻浅,似纳尔逊氏棉。除第一朵花为闭花外,其余均为开放花,呈玫瑰红色。少数花药退化成托叶状。减数分裂中期I的染 相似文献
52.
53.
54.
Qun Wan Zhengsheng Zhang Meichun Hu Li Chen Dajun Liu Xiao Chen Wei Wang Jing Zheng 《Euphytica》2007,158(1-2):241-247
A genetic linkage map of chromosome 6 was constructed by using 270 recombinant inbred lines originated from an upland cotton
cross (Yumian 1 × T586) F2 population. The genetic map included one morphological (T1) and 18 SSR loci, covering 96.2 cM with an average distance of 5.34 cM between two markers. Based on composite interval mapping
(CIM), QTL(s) affecting lint percentage, fiber length, fiber length uniformity, fiber strength and spiny bollworm resistance
(Earias spp.) were identified in the t1 locus region on chromosome 6. The allele(s) originating from T586 of QTLs controlling lint percentage increased the trait
phenotypic value while the alleles originating from Yumian 1 of QTLs affecting fiber length, fiber length uniformity, fiber
strength and spiny bollworm resistance increased the trait phenotypic value. 相似文献
55.
56.
Oz Barazani Azat Atayev Bakhtiyor Yakubov Vladimir Kostiukovsky Konstantin Popov Avi Golan-Goldhirsh 《Genetic Resources and Crop Evolution》2003,50(4):383-389
Seedlings of Pistacia vera L. developed from seeds of two separate populations in Turkmenistan, Kepele and Agachli, were evaluated for their growth potential and genetic polymorphism. Plant growth rate as well as random amplified polymorphic DNA (RAPD) analysis showed distinct differences between the two populations. In plant height growth rate, 17 Agachli accessions were 1.3 times higher on average than that of 10 accessions of Kepele (significant at p = 0.046) and 1.2 times higher for trunk diameter growth rate (p = 0.062). Cluster analysis divided most accessions into two main genetic groups according to their geographic origin. The Agachli group was further divided into two subgroups. One Kepele accession (K4), was genetically different from the rest and clustered on a separate outgroup. Two Agachli accessions (A12 and A17) were outside the two main populations clusters. Accessions K9 and K10 from Kepele were exceptional and were clustered in each of the two Agachli's subgroups, indicating a close genetic relationship between the two populations. In addition, high similarity values (0.58–1.00) and small genetic distances reflect plausible gene flow between Kepele and Agachli, which are 100 Km apart. Mantel test revealed significant relationship between the RAPD and the morphological traits matrices, pointing to the genetic basis for the measured differences in the growth rate. Growing the accessions on the same plot, under similar conditions enabled the evaluation of genotypic differences. The combination of morphological traits and molecular markers will further assist in preservation of genetic variability and cultivation of useful genotypes of P. vera L. 相似文献
57.
A.?M.?Ramos-Cabrer S.?Pereira-LorenzoEmail author 《Genetic Resources and Crop Evolution》2005,52(7):879-890
This study is focused in the main chestnut growing areas from north- to south-western Spain. We studied 50 accessions corresponding
to 22 cultivars named by local growers; 11 from Andalucía, 9 from Castilla-León, and 2 from Extremadura. These were compared
with 22 types classified previously in Galicia (82 accessions). Ten morphological traits and five isoenzyme systems were used
to classify them and establish genetic relationships. A lower genetic variability has been found in Extremadura (middle Spain)
and Andalucía (south) than in Galicia (north western) which may be because of the lower importance of the crop in those areas
and the geographic barriers between them. Galicia could be the origin of the types found in Castilla-León, Extremadura, and
south-western Andalucía, and the types found in Central Andalucía were closer to those found in Castilla-León and Extremadura.
Most accessions studied (117/132) could be classified positively, making 37 out of 44 cultivars found from northern to southern
Spain. Three groups of synonymies were found in Castilla-León: ‘Brava’ and ‘Negral’, ‘Gallego’ and ‘Injerto’, and ‘Rapega’
and ‘Verdello’. Most of the Spanish types have been propagated as a principal clone. Variability within the types is important
and must be considered to select the best clones as cultivars. 相似文献
58.
本文初步研究了攀枝花市不同年龄与生境的麻疯树老树,分析了老树特征与衰老的环境诱导结构限制现象。结果表明:(1)麻疯树衰老树体相对地径(16 cm~62 cm)、树龄(15 a~41 a)、冠幅(3 m×3 m~8.5 m×8.5m)、高度(2 m~6.96 m)较大,一级枝较大,有一定比例的枯死枝;(2)新梢小(枝径0.7 cm~1.12 cm;长度7 cm~28 cm之间),生长量低,萌生枝稀少,生殖枝比例偏低(趋近于30%以下);(3)单枝坐果量低(0~3个),干果重量1.65 g,千粒重490 g,壳比例30%,适合度偏低;(4)生境肥沃时树龄偏大,衰老程度弱,而生境瘠薄时树龄小,衰老程度强烈;(5)不考虑环境异质性,则衰老为树体结构限制的结果,新梢大小小于分支阈值,丧失了树体发育的能力而成为限制生长的因素。综合分析,麻疯树老树指标是分支率,在分支率为1时衰老启动;形态上衰老为环境诱导结构限制的产物,而结构限制可能是衰老的主观因素。 相似文献
59.
We present here an indicator of soil quality that evaluates soil ecosystem services through a set of 5 subindicators, and further combines them into a single general Indicator of Soil Quality (GISQ). We used information derived from 54 properties commonly used to describe the multifaceted aspects of soil quality. The design and calculation of the indicators were based on sequences of multivariate analyses. Subindicators evaluated the physical quality, chemical fertility, organic matter stocks, aggregation and morphology of the upper 5 cm of soil and the biodiversity of soil macrofauna. A GISQ combined the different subindicators providing a global assessment of soil quality.Research was conducted in two hillside regions of Colombia and Nicaragua, with similar types of land use and socio-economic context. However, soil and climatic conditions differed significantly. In Nicaragua, soil quality was assessed at 61 points regularly distributed 200 m apart on a regular grid across the landscape. In Colombia, 8 plots representing different types of land use were arbitrarily chosen in the landscape and intensively sampled. Indicators that were designed in the Nicaragua site were further applied to the Colombian site to test for their applicability.In Nicaragua, coffee plantations, fallows, pastures and forest had the highest values of GISQ (1.00; 0.80; 0.78 and 0.77, respectively) while maize crops and eroded soils (0.19 and 0.10) had the lowest values. Examination of subindicator values allowed the separate evaluation of different aspects of soil quality: subindicators of organic matter, aggregation and morphology and biodiversity of macrofauna had the maximum values in coffee plantations (0.89; 0.72 and 0.56, respectively on average) while eroded soils had the lowest values for these indicators (0.10; 0.31 and 0.33, respectively).Indicator formulae derived from information gained at the Nicaraguan sites were not applicable to the Colombian situation and site-specific constants were calculated.This indicator allows the evaluation of soil quality and facilitates the identification of problem areas through the individual values of each subindicator. It allows monitoring of change through time and can guide the implementation of soil restoration technologies. Although GISQ formulae computed on a set of data were only valid at a regional scale, the methodology used to create these indices can be applied everywhere. 相似文献
60.
利用基因芯片技术筛选棉纤维伸长相关基因 总被引:6,自引:1,他引:5
从回交近交系(backcross inbred lines, BIL)群体中选取纤维长度差异较大的两个系NMGA-062 (33.03 mm)和 NMGA-140 (25.87 mm),利用Affymetrix棉花基因芯片,分析其开花后10 d (DPA, days post anthesis)棉纤维伸长相关基因表达谱。在24 029条转录本中,两材料间差异表达的转录本有7 282条,占总数的30.31%;其中差异表达倍数在2倍或2倍以上的转录本有3 993条,占筛选转录本总数的16.62%,功能分类表明这些转录本主要包括功能预测基因(15.57%)、翻译、核糖体结构相关基因(13.54%)和翻译后修饰、蛋白质转换相关基因(9.29%)3大类。为了验证芯片数据的可信性,8个差异表达显著的基因(Ghi.10655.1.S1_s_at, ACO1, ARF1, SAHH, TUA6, TUA7, β-tub1, β-tub10)被用于实时荧光定量PCR。两种检测手段表现出一致性。随后,利用实时荧光定量PCR对3个与棉纤维相关基因(ARF1, β-tub1, β-tub10)在纤维发育不同时期(5、10、15、20和25 DPA)的表达模式进行了研究,结果表明,3个基因在纤维伸长发育时期(10和15 DPA)大量表达,推测这3个基因可能与棉纤维伸长有重要关系。 相似文献