全文获取类型
收费全文 | 70篇 |
免费 | 5篇 |
国内免费 | 2篇 |
专业分类
系统科学 | 3篇 |
现状及发展 | 38篇 |
研究方法 | 8篇 |
综合类 | 28篇 |
出版年
2021年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2014年 | 1篇 |
2012年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有77条查询结果,搜索用时 0 毫秒
31.
Integrated genomic approaches implicate osteoglycin (Ogn) in the regulation of left ventricular mass
32.
33.
Summary In a study with binary mixtures of 3 spring wheat cultivars harmful effects due to allelopathy were observed on root number, root growth and fresh weight of the seedlings.We thank Director, I.A.R.I. for facilities and encouragement. 相似文献
34.
Summary Sodium butyrate and cyclic AMP-stimulating agents (prostaglandin E1, papaverine, theophylline, and RO20-1724) caused reductions in the cell number (primarily due to reduction in cell division) when added individually to human melanoma cells in culture. However, the combination of sodium butyrate with one of the cyclic AMP-stimulating agents produced a marked reduction in cell number (primarily due to cell death).Supported in part by BRSG grant RR-05357 awarded by Biomedical Research Support Grant Program, Division of Research Resources, National Institutes of Health. We thank Marianne Gaschler for her technical help. 相似文献
35.
Phosphorus partitioning and recovery of low-phosphorus iron-rich compounds through physical separation of Linz-Donawitz slag 下载免费PDF全文
Dilip Makhija Rajendra Kumar Rath Kaushik Chakravarty Abhay Shankar Patra Asim Kumar Mukherjee Akhilesh Kumar Dubey 《矿物冶金与材料学报》2016,23(7):751-759
The Linz-Donawitz (LD) steelmaking process produces LD slag at a rate of about 125 kg/t. After metallic scrap recovery, the non-metallic LD slag is rejected because its physical/chemical properties are unsuitable for recycling. X-ray diffraction (XRD) studies have indicated that non-metallic LD slag contains a substantial quantity of mineral phases such as di- and tricalcium silicates. The availability of these mineral phases indicates that LD slag can be recycled by iron (Fe)-ore sintering. However, the presence of 1.2wt% phosphorus (P) in the slag renders the material unsuitable for sintering operations. Electron probe microscopic analysis (EPMA) studies indicated concentration of phosphorus in dicalcium silicate phase as calcium phosphate. The Fe-bearing phases (i.e., wustite and dicalcium ferrite) showed comparatively lower concentrations of P compared with other phases in the slag. Attempts were made to lower the P content of LD slag by adopting various beneficiation techniques. Dry high-intensity magnetic separation and jigging were performed on as-received samples with particle sizes of 6 and 3 mm. Spiral separation was conducted using samples ground to sizes of less than 1 and 0.5 mm. Among these studies, grinding to 0.5 mm followed by spiral concentration demonstrated the best results, yielding a concentrate with about 0.75wt% P and 45wt% Fe. 相似文献
36.
Hu L Crawford SE Czako R Cortes-Penfield NW Smith DF Le Pendu J Estes MK Prasad BV 《Nature》2012,485(7397):256-259
As with many other viruses, the initial cell attachment of rotaviruses, which are the major causative agent of infantile gastroenteritis, is mediated by interactions with specific cellular glycans. The distally located VP8* domain of the rotavirus spike protein VP4 (ref. 5) mediates such interactions. The existing paradigm is that 'sialidase-sensitive' animal rotavirus strains bind to glycans with terminal sialic acid (Sia), whereas 'sialidase-insensitive' human rotavirus strains bind to glycans with internal Sia such as GM1 (ref. 3). Although the involvement of Sia in the animal strains is firmly supported by crystallographic studies, it is not yet known how VP8* of human rotaviruses interacts with Sia and whether their cell attachment necessarily involves sialoglycans. Here we show that VP8* of a human rotavirus strain specifically recognizes A-type histo-blood group antigen (HBGA) using a glycan array screen comprised of 511 glycans, and that virus infectivity in HT-29 cells is abrogated by anti-A-type antibodies as well as significantly enhanced in Chinese hamster ovary cells genetically modified to express the A-type HBGA, providing a novel paradigm for initial cell attachment of human rotavirus. HBGAs are genetically determined glycoconjugates present in mucosal secretions, epithelia and on red blood cells, and are recognized as susceptibility and cell attachment factors for gastric pathogens like Helicobacter pylori and noroviruses. Our crystallographic studies show that the A-type HBGA binds to the human rotavirus VP8* at the same location as the Sia in the VP8* of animal rotavirus, and suggest how subtle changes within the same structural framework allow for such receptor switching. These results raise the possibility that host susceptibility to specific human rotavirus strains and pathogenesis are influenced by genetically controlled expression of different HBGAs among the world's population. 相似文献
37.
38.
Summary Daily feeding of the common food color Orange II to mice in doses of up to 3.0 g/kg b.wt for 180 days had deleterious effects on somatic and spermatogonial chromosomes. The chromosomal abnormalities induced were breaks, gaps, constrictions, centric fusion, fragments of unknown origin, translocation, deletion, stickiness, ring chromosomes, pyknosis and other bizarre configurations.Grateful acknowledgment is made to Prof. U.S. Srivastava, Zoology Department for providing necessary laboratory facilities. 相似文献
39.
Harsha HC Suresh S Amanchy R Deshpande N Shanker K Yatish AJ Muthusamy B Vrushabendra BM Rashmi BP Chandrika KN Padma N Sharma S Badano JL Ramya MA Shivashankar HN Peri S Choudhury DR Kavitha MP Saravana R Niranjan V Gandhi TK Ghosh N Chandran S Menezes M Joy M Mohan SS Katsanis N Deshpande KS Raghothama C Prasad CK Pandey A 《Nature genetics》2005,37(4):331-332
40.