全文获取类型
收费全文 | 2166篇 |
免费 | 209篇 |
国内免费 | 56篇 |
出版年
2024年 | 7篇 |
2023年 | 42篇 |
2022年 | 86篇 |
2021年 | 91篇 |
2020年 | 63篇 |
2019年 | 92篇 |
2018年 | 61篇 |
2017年 | 73篇 |
2016年 | 82篇 |
2015年 | 72篇 |
2014年 | 99篇 |
2013年 | 148篇 |
2012年 | 84篇 |
2011年 | 108篇 |
2010年 | 67篇 |
2009年 | 113篇 |
2008年 | 102篇 |
2007年 | 98篇 |
2006年 | 114篇 |
2005年 | 102篇 |
2004年 | 77篇 |
2003年 | 81篇 |
2002年 | 58篇 |
2001年 | 40篇 |
2000年 | 46篇 |
1999年 | 38篇 |
1998年 | 27篇 |
1997年 | 14篇 |
1996年 | 31篇 |
1995年 | 35篇 |
1994年 | 25篇 |
1993年 | 34篇 |
1992年 | 39篇 |
1991年 | 21篇 |
1990年 | 16篇 |
1989年 | 14篇 |
1988年 | 19篇 |
1987年 | 18篇 |
1986年 | 18篇 |
1985年 | 19篇 |
1984年 | 16篇 |
1983年 | 5篇 |
1982年 | 9篇 |
1981年 | 4篇 |
1980年 | 10篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1970年 | 2篇 |
1953年 | 1篇 |
排序方式: 共有2431条查询结果,搜索用时 15 毫秒
1.
The ECF™ lateral flow assay test is marketed to detect non-pregnancy in mares. The objectives of the present study were to determine the accuracy of the ECF test, the accuracy of the electronic reader accompanying the ECF test, and agreement between two human readers and the electronic reader. Serum samples were collected from anestrus, cycling but not inseminated, and inseminated mares, and were evaluated with the ECF™ test (EDP Biotech Company, Knoxville, TN, USA) at The Ohio State University and at the EDP Biotech Laboratory. Specificity ranged from 0.07 to 0.16, the negative predictive value ranged from 0.15 to 0.33, and accuracy ranged from 0.43 to 0.52. The electronic reader did not add improve the accuracy or predictive values of the test. Based on the electronic reader, 80.0% of the serum samples collected from the anestrus mares were false positives; Readers 1 and 2 had 60.0 and 33.3% false positives, respectively. For samples collected during the estrous cycle, 83.9% were false positives by the electronic reader, whereas Readers 1 and 2 had 43.7 and 26.4% false positives. We concluded that, regardless of whether the test strips were evaluated by a human or electronic reader, this assay was not accurate for determination of the non-pregnant mare. 相似文献
2.
M. von Balthazar K. Raunsgaard Pedersen E. M. Friis 《Plant Systematics and Evolution》2005,255(1-2):55-75
A charcoalified fossil flower bud of a new genus and species (Teixeiria lusitanica) is described from the Early Cretaceous of Portugal. The flower is actinomorphic and unisexually male. At the base of the
bud there are several bracts of different sizes, which are followed by sepal-like and petal-like tepals. Bracts and perianth
organs seem to be arranged spirally and to exhibit transitions between different organ categories. The androecium has numerous
stamens in two sizes, but with unclear arrangement. Pollen is small and tricolpate with a perforate tectum and a densely columellate
infratectal layer. No carpels or remains of carpels could be observed on the floral axis. Teixeiria lusitanica shows most affinities to members of Ranunculales. There are also some similarities with Berberidopsis (Berberidopsidaceae, Berberidopsidales) and members of the Saxifragales (Hamamelidaceae and Daphniphyllaceae). 相似文献
3.
4.
《Cell reports》2020,30(1):153-163.e5
5.
6.
Seven hundred and fifty-two rhizobacteria were isolated from 186 rhizosphere soil samples collected across tomato growing regions of Karnataka. Among them, 26% strains were Gram positive and other 74% were Gram negative and dominant being Bacillus and Pseudomonas. Sampling of different locations showed variation in species richness and diversity indices. Similarity matrix computed with Jaccard’s coefficient and principle coordinate analysis to correlate bacterial diversity revealed that rhizobacterial genera of Mysore, Mandya and Kolar soil samples were very closely related and rarefaction curve analysis indicated that these soil samples also harbored higher number of rhizobacteria which included all the genera studied. PGPR trait analysis revealed that most of the rhizobacteria were endowed with more than one beneficial trait which may act individually or simultaneously, and indole acetic acid production and phosphate solubilization are the two predominant traits exhibited by these rhizobacteria. Rhizobacterial isolates also showed a varied level of plant growth promotion traits and offered protection against fungal origin foliar and root pathogens. Among the nine regions studied, Mysore, Mandya and Kolar regions recorded higher percentage of promising PGPRs in comparison with other regions studied of Karnataka. 相似文献
7.
Florian Witzmann 《Acta zoologica》2011,92(3):281-302
Witzmann F. (2011). Morphological and histological changes of dermal scales during the fish‐to‐tetrapod transition. —Acta Zoologica (Stockholm) 92 : 281–302. The gastral scales of limbed tetrapodomorphs evolved from the ‘elpistostegid’‐type of scale by an enlargement and differentiation of the articulation facets and a shortening and broadening of the keel. These changes caused a tighter connection between gastral scales within a scale row and a greater overlap between the rows. Dorsal round scales of limbed tetrapodomorphs developed from a gastral scale‐type by an alteration of the ontogenetic pathway. The posterolateral direction of scale rows in ‘elpistostegids’ was retained in the gastral scalation of most limbed tetrapodomorphs, whereas the arrangement of round dorsal scales is modified to a transverse orientation. Both gastral and dorsal scales of limbed tetrapodomorphs consist solely of parallel‐fibred bone with circumferential growth marks. The proportionally larger overlap surfaces of gastral scales and their mode of articulation in the ventral midline indicate that the body of limbed tetrapodomorphs might have been more flexible than that of their finned relatives. The alteration of dermal scales was one of the most rapid morphological changes during the fish‐to‐tetrapod transition. Once established, gastral and dorsal scales were retained as a conservative character in different lineages of basal tetrapods, in both the amphibian and the amniote lineages. 相似文献
8.
Daniel L. Gebo 《Primates; journal of primatology》1989,30(3):347-367
With the exception of leaping, lorises and galagos move in many similar ways although frequencies and styles differ. This
peculiar locomotor distinction in two closely related subfamilies has profoundly altered their respective postcranial anatomies
from their common ancestor. A comparison of postcranial adaptation in extant forms shows that lorises and galagos differ somewhat
in forelimb mobility, but are more fundamentally disparate in hindlimb adaptation. Inferences concerning locomotor adaptation
in the lorisid fossil record indicate a more generalized locomotor pattern which is more like that of extant cheirogaleids
than either living galagos or lorises. Thus, vertical clinging and leaping in galagines and the slow-climbing and suspensory
movements of lorisines appear to be evolutionarily recent innovations from a more generalized locomotor past. 相似文献
9.
Real-time ultrasonography was used to detect early pregnancy in 32 longtailed macaques (Macaca fascicularis). In 92% of the successful conceptions, a correct diagnosis was made. The earliest sign of pregnancy was an intrauterine ringlike structure (11 days). A "line swelling" (14 days) preceded definite fetal echoes (21 days), and fetal heart motion (30 days) proved fetal viability. Ultrasound is a rapid, noninvasive, and relatively cost-effective method of diagnosing and monitoring early pregnancy in M. fascicularis. 相似文献
10.
甘肃东乡几种早中新世哺乳动物化石 总被引:14,自引:3,他引:11
本文记述了在甘肃东乡椒子沟发现的几种早中新世哺乳动物化石:Gomphotherium sp、Dzungariotheriura orgosense、Rhinocerotidae gen. indet.和Paraentelodon macrognathus sp. nov.,着重讨论了全北区猪齿兽类的系统关系。根据化石的性质判断,东乡椒子沟化石点的地质时代应与欧洲Burdigalian早期,亦即MN_3相当或稍早。笔者将原定为上新世临夏组的第一、二岩性段划出,命名为椒子沟组,其时代为早中新世。 相似文献