全文获取类型
收费全文 | 128篇 |
免费 | 7篇 |
国内免费 | 19篇 |
专业分类
系统科学 | 4篇 |
现状及发展 | 39篇 |
研究方法 | 13篇 |
综合类 | 89篇 |
自然研究 | 9篇 |
出版年
2021年 | 4篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 9篇 |
2012年 | 10篇 |
2011年 | 11篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1986年 | 1篇 |
1980年 | 2篇 |
1979年 | 6篇 |
1978年 | 9篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1972年 | 5篇 |
1971年 | 8篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1965年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 31 毫秒
51.
52.
53.
M. S. Khan T. O. Sasidharan P. K. Ghosh 《Cellular and molecular life sciences : CMLS》1979,35(9):1185-1186
Summary The different body fluid compartments in normally watered and 4-day water-deprived goasts of Rajasthan desert, India, were measured in autumn. The goats maintained plasma volume and extracellular fluid volume, but lost gut and cell water considerably under the experimental conditions; indicating that the maintenance of the fluidity of the blood has priority over the body's other fluid requirements in this desert-adapted species during water deprivation.We are indebted to Dr H.S. Mann, Central Arid Zone Research Institute, Jodhpur for kindly providing the necessary facilities for this work. 相似文献
54.
55.
Sanjay Kumar Bharti Irfan Khan Taraswi Banerjee Joshua A. Sommers Yuliang Wu Robert M. Brosh Jr. 《Cellular and molecular life sciences : CMLS》2014,71(14):2625-2639
In 2010, a new recessive cohesinopathy disorder, designated Warsaw breakage syndrome (WABS), was described. The individual with WABS displayed microcephaly, pre- and postnatal growth retardation, and abnormal skin pigmentation. Cytogenetic analysis revealed mitomycin C (MMC)-induced chromosomal breakage; however, an additional sister chromatid cohesion defect was also observed. WABS is genetically linked to bi-allelic mutations in the ChlR1/DDX11 gene which encodes a protein of the conserved family of Iron–Sulfur (Fe–S) cluster DNA helicases. Mutations in the budding yeast ortholog of ChlR1, known as Chl1, were known to cause sister chromatid cohesion defects, indicating a conserved function of the gene. In 2012, three affected siblings were identified with similar symptoms to the original WABS case, and found to have a homozygous mutation in the conserved Fe–S domain of ChlR1, confirming the genetic linkage. Significantly, the clinically relevant mutations perturbed ChlR1 DNA unwinding activity. In addition to its genetic importance in human disease, ChlR1 is implicated in papillomavirus genome maintenance and cancer. Although its precise functions in genome homeostasis are still not well understood, ongoing molecular studies of ChlR1 suggest the helicase plays a critically important role in cellular replication and/or DNA repair. 相似文献
56.
Imran Sadiq Shahzad Naseem Muhammad Naeem Ashiq M.A. Khan Shanawer Niaz M.U. Rana 《自然科学进展(英文版)》2015,25(5):419-424
The sol–gel auto-combustion method was adopted to synthesize nanomaterials of single-phase X-type hexagonal ferrites with the composition of Sr2?xGdxNi2Fe28?yCdyO46 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10 and y=0, 0.1, 0.2, 0.3, 0.4, 0.5). The structural properties were carried out by XRD analysis and the lattice parameters show variation with the doping of Gd–Cd. The average particle size measured by TEM was in the range of 8–10 nm which is beneficial in obtaining suitable signal-to-noise ratio in recording media and biomedical applications. The room temperature resistivity enhanced with the increase of the dopant concentration. The increase in resistivity indicates that the synthesized materials can be considered good for the formation of the multilayer chip inductors (MLCIs) as well as for the reduction of eddy current losses. The dielectric constant decreased with the increase in the frequency which is the general reported trend of the hexagonal ferrites and can be explained on the basis of Koop?s theory and Maxwell–Wagner polarization-model. The abnormal dielectric behavior indicates the formation of small polarons in the material. The maximum value of tangent loss at low frequencies reflects the application of these materials in medium frequency devices (MF). 相似文献
57.
58.
59.
60.