全文获取类型
收费全文 | 1110篇 |
免费 | 126篇 |
出版年
2021年 | 16篇 |
2020年 | 9篇 |
2019年 | 11篇 |
2018年 | 7篇 |
2017年 | 12篇 |
2016年 | 24篇 |
2015年 | 30篇 |
2014年 | 40篇 |
2013年 | 49篇 |
2012年 | 64篇 |
2011年 | 53篇 |
2010年 | 28篇 |
2009年 | 35篇 |
2008年 | 29篇 |
2007年 | 41篇 |
2006年 | 38篇 |
2005年 | 38篇 |
2004年 | 28篇 |
2003年 | 33篇 |
2002年 | 29篇 |
2001年 | 35篇 |
2000年 | 31篇 |
1999年 | 35篇 |
1998年 | 14篇 |
1997年 | 13篇 |
1996年 | 12篇 |
1995年 | 15篇 |
1993年 | 13篇 |
1992年 | 22篇 |
1991年 | 30篇 |
1990年 | 27篇 |
1989年 | 31篇 |
1988年 | 20篇 |
1987年 | 17篇 |
1986年 | 22篇 |
1985年 | 29篇 |
1984年 | 32篇 |
1983年 | 14篇 |
1981年 | 12篇 |
1980年 | 9篇 |
1979年 | 13篇 |
1977年 | 18篇 |
1976年 | 10篇 |
1975年 | 9篇 |
1974年 | 11篇 |
1973年 | 8篇 |
1972年 | 10篇 |
1968年 | 10篇 |
1965年 | 10篇 |
1964年 | 5篇 |
排序方式: 共有1236条查询结果,搜索用时 15 毫秒
1.
2.
Current and emerging commercial optical biosensors. 总被引:5,自引:0,他引:5
The field of commercial optical biosensors is rapidly evolving, with new systems and detection methods being developed each year. This review outlines the currently available biosensor hardware and highlights unique features of each platform. Affinity-based biosensor technology, with its high sensitivity, wide versatility and high throughput, is playing a significant role in basic research, pharmaceutical development, and the food and environmental sciences. Likewise, the increasing popularity of biosensors is prompting manufacturers to develop new instrumentation for dedicated applications. We provide a preview of some of the emerging commercial systems that are dedicated to drug discovery, proteomics, clinical diagnostics and routine biomolecular interaction analysis. 相似文献
3.
4.
5.
Glycosylated haemoglobin (HbA1) was measured in seven insulin-dependent diabetic patients before, during, and after a seven-day period of monitored poor control. There was considerable individual variation in the pattern and degree of change in HbA1 concentration induced by poor control and the time when it occurred. Greater increases in HbA1 were seen during the period of metabolic derangement than in the subsequent two months. More information is required before HbA1 estimations are widely used clinically to monitor control in individual diabetics. 相似文献
6.
Dugald Baird 《BMJ (Clinical research ed.)》1950,2(4688):1100-1101
7.
Photolysis of E-[ring-2-14C]urocanic acid (UA) with native or denatured calf thymus DNA leads to covalent binding of the radiolabel to the nucleic acid. A similar observation is made upon photolysis of the labeled UA with the polyribonucleotides, in which case a strong preference is observed for binding to poly[U]. DNA or poly[U], which had been reacted with UA and purified by dialysis and multiple precipitations, releases UA upon further irradiation with 254 nm light (as expected for cyclobutane adducts). Quantum efficiencies for binding of the UA to native DNA have been measured at 308 and 266 nm and are 0.30 x 10(-5) and 1.3 x 10(-4), respectively, at comparable reactant concentrations. The large increase at the shorter wavelength (where DNA absorption is more competitive) is taken as evidence for the primary role of a DNA excited state in initiating the binding reaction(s). 相似文献
8.
The work in the resuscitation room is initial intensive care. This must be always available independent of inpatient resources. This demands investment in adequate equipment and staffing. Much of the work is medical rather than surgical and appropriate for physicians to treat. Our experience might help others to plan for the future. 相似文献
9.
10.