全文获取类型
收费全文 | 2599篇 |
免费 | 122篇 |
出版年
2024年 | 4篇 |
2023年 | 16篇 |
2022年 | 52篇 |
2021年 | 66篇 |
2020年 | 37篇 |
2019年 | 71篇 |
2018年 | 71篇 |
2017年 | 45篇 |
2016年 | 102篇 |
2015年 | 138篇 |
2014年 | 149篇 |
2013年 | 196篇 |
2012年 | 261篇 |
2011年 | 240篇 |
2010年 | 154篇 |
2009年 | 126篇 |
2008年 | 188篇 |
2007年 | 170篇 |
2006年 | 115篇 |
2005年 | 106篇 |
2004年 | 92篇 |
2003年 | 79篇 |
2002年 | 55篇 |
2001年 | 38篇 |
2000年 | 34篇 |
1999年 | 27篇 |
1998年 | 10篇 |
1997年 | 10篇 |
1995年 | 4篇 |
1993年 | 8篇 |
1992年 | 12篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1968年 | 1篇 |
1967年 | 3篇 |
1965年 | 1篇 |
排序方式: 共有2721条查询结果,搜索用时 31 毫秒
61.
Figen Seymen Youn Jung Kim Ye Ji Lee Jenny Kang Tak-Heun Kim Hwajung Choi Mine Koruyucu Yelda Kasimoglu Elif Bahar Tuna Koray Gencay Teo Jeon Shin Hong-Keun Hyun Young-Jae Kim Sang-Hoon Lee Zang Hee Lee Hong Zhang Jan C-C. Hu James P. Simmer Eui-Sic Cho Jung-Wook Kim 《American journal of human genetics》2016,99(5):1199-1205
62.
63.
64.
65.
Emerging solar cells, namely, organic solar cells and perovskite solar cells, are the thin‐film photovoltaics that have light to electricity conversion efficiencies close to that of silicon solar cells while possessing advantages in having additional functionalities, facile‐processability, and low fabrication cost. To maximize these advantages, the electrode components must be replaced by materials that are more flexible and cost‐effective. Researchers around the globe have been looking for the new electrodes that meet these requirements. Among many candidates, single‐walled carbon nanotubes have demonstrated their feasibility as the new alternative to conventional electrodes, such as indium tin oxide and metals. This review discusses various growth methods of single‐walled carbon nanotubes and their electrode applications in thin‐film photovoltaics. 相似文献
66.
Hyeonwoo Kim Seung‐Un Lee Do Yoon Lee Min Jae Paik Hyejin Na Jaemin Lee Sang Il Seok 《Liver Transplantation》2019,9(47)
Recently, two‐dimensional (2D) structure on three‐dimensional (3D) perovskites (graded 2D/3D) has been reported to be effective in significantly improving both efficiency and stability. However, the electrical properties of the 2D structure as a passivation layer on the 3D perovskite thin film and resistance to the penetration of moisture may vary depending on the length of the alkyl chain. In addition, the surface defects of the 2D itself on the 3D layer may also be affected by the correlation between the 2D structure and the hole conductive material. Therefore, systematic interfacial study with the alkyl chain length of long‐chained alkylammonium iodide forming a 2D structure is necessary. Herein, the 2D interfacial layers formed are compared with butylammonium iodide (BAI), octylammonium iodide (OAI), and dodecylammonium iodide (DAI) iodide on a 3D (FAPbI3)0.95(MAPbBr3)0.05 perovskite thin film in terms of the PCE and humidity stability. As the length of the alkyl chain increased from BA to OA to DA, the electron‐blocking ability and humidity resistance increase significantly, but the difference between OA and DA is not large. The PSC post‐treated with OAI has slightly higher PCE than those treated with BAI and DAI, achieving a certified stabilized efficiency of 22.9%. 相似文献
67.
Jungil Yang Lae‐Hyeon Cho Jinmi Yoon Hyeryung Yoon Antt Htet Wai Woo‐Jong Hong Muho Han Hitoshi Sakakibara Wanqi Liang Ki‐Hong Jung Jong‐Seong Jeon Hee‐Jong Koh Dabing Zhang Gynheung An 《Plant biotechnology journal》2019,17(1):178-187
Grain number is an important agronomic trait. We investigated the roles of chromatin interacting factor Oryza sativa VIN3‐LIKE 2 (OsVIL2), which controls plant biomass and yield in rice. Mutations in OsVIL2 led to shorter plants and fewer grains whereas its overexpression (OX) enhanced biomass production and grain numbers when compared with the wild type. RNA‐sequencing analyses revealed that 1958 genes were up‐regulated and 2096 genes were down‐regulated in the region of active division within the first internodes of OX plants. Chromatin immunoprecipitation analysis showed that, among the downregulated genes, OsVIL2 was directly associated with chromatins in the promoter region of CYTOKININ OXIDASE/DEHYDROGENASE2 (OsCKX2), a gene responsible for cytokinin degradation. Likewise, active cytokinin levels were increased in the OX plants. We conclude that OsVIL2 improves the production of biomass and grain by suppressing OsCKX2 chromatin. 相似文献
68.
Jihun Ryu Do Un Hwang Yeon Jae Bae Si Hyeock Lee Young Ho Kim Seung‐Yeol Lee Hee‐Young Jung Kwang Shik Choi 《Entomological Research》2019,49(9):432-435
Pyrethroid insecticides have been effective and powerful for controlling mosquitoes. However, abuse of these insecticides increases the number of resistant mosquitoes. In this study, Culex pipiens pallens and Aedes koreicus were collected from an artificial reservoir in the vicinity of a populated area in Korea, which is also a migratory bird catchment area. To monitor resistance to pyrethroid insecticides in mosquitoes, genomic DNA from the collected mosquitoes was sequenced for the kdr mutation in the voltage‐gated sodium channel (VGSC) gene. As a result, three samples with homozygous resistance (17.6%) and one with heterozygous resistance (5.9%) were found among 17 Cx. pipiens pallens specimens. One of the samples had a unique sequence at the amplified VGSC region. Of the 15 Ae. koreicus, no insecticide resistant individuals were found. In Korea, this is the first report of kdr genetic traits in Ae. koreicus and Cx. pipiens pallens and of a unique VGSC allele in Cx. pipiens pallens. Further investigation is needed to monitor the kdr resistance of these species in Korea and to determine how the unique sequence found in Cx. pipiens pallens is related to insecticide resistance. 相似文献
69.
70.
Sil H. J. van Lieshout Amanda Bretman Chris Newman Christina D. Buesching David W. Macdonald Hannah L. Dugdale 《Molecular ecology》2019,28(18):4152-4165
Individual variation in survival probability due to differential responses to early‐life environmental conditions is important in the evolution of life histories and senescence. A biomarker allowing quantification of such individual variation, and which links early‐life environmental conditions with survival by providing a measure of conditions experienced, is telomere length. Here, we examined telomere dynamics among 24 cohorts of European badgers (Meles meles). We found a complex cross‐sectional relationship between telomere length and age, with no apparent loss over the first 29 months, but with both decreases and increases in telomere length at older ages. Overall, we found low within‐individual consistency in telomere length across individual lifetimes. Importantly, we also observed increases in telomere length within individuals, which could not be explained by measurement error alone. We found no significant sex differences in telomere length, and provide evidence that early‐life telomere length predicts lifespan. However, while early‐life telomere length predicted survival to adulthood (≥1 year old), early‐life telomere length did not predict adult survival probability. Furthermore, adult telomere length did not predict survival to the subsequent year. These results show that the relationship between early‐life telomere length and lifespan was driven by conditions in early‐life, where early‐life telomere length varied strongly among cohorts. Our data provide evidence for associations between early‐life telomere length and individual life history, and highlight the dynamics of telomere length across individual lifetimes due to individuals experiencing different early‐life environments. 相似文献