全文获取类型
收费全文 | 1214篇 |
免费 | 3篇 |
国内免费 | 1篇 |
专业分类
化学工业 | 5篇 |
机械仪表 | 1篇 |
矿业工程 | 2篇 |
轻工业 | 4篇 |
无线电 | 2篇 |
一般工业技术 | 5篇 |
冶金工业 | 1197篇 |
自动化技术 | 2篇 |
出版年
2016年 | 2篇 |
2015年 | 1篇 |
2013年 | 1篇 |
2010年 | 1篇 |
2008年 | 1篇 |
2005年 | 1篇 |
2003年 | 2篇 |
1999年 | 29篇 |
1998年 | 322篇 |
1997年 | 219篇 |
1996年 | 155篇 |
1995年 | 104篇 |
1994年 | 60篇 |
1993年 | 73篇 |
1992年 | 7篇 |
1991年 | 23篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 11篇 |
1980年 | 14篇 |
1979年 | 1篇 |
1978年 | 6篇 |
1977年 | 47篇 |
1976年 | 93篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1929年 | 1篇 |
1924年 | 2篇 |
排序方式: 共有1218条查询结果,搜索用时 7 毫秒
101.
102.
103.
Here the current studies in cell DNA content of plasma cells (PC), from multiple myeloma (MM) patients is reviewed, focusing on two complementary aspects the detection of clonal abnormalities and the identification of the proliferative rate of PC. There is accumulating evidence that the measurement of cell DNA content by flow cytometry (FCM) is a useful parameter in the clinical evaluation of MM patients. Between 50 and 70% of MM patients display DNA aneuploidy, the majority of them being hyperdiploid. Comparing hyperdiploid with diploid patients, the former seem to display a better prognosis. Fluorescence in situ hybridization studies have confirmed that there is a high incidence of numerical chromosome abnormalities in MM and that trisomies are significantly more common than monosomies (84% vs 14%). The most frequent gains can be seen in chromosome 9 and 15 while the most common monosomies are those of chromosome 13 and X in females. The possibility of analysing the cell cycle distribution by using a propidium iodide (PI)/CD38 double staining technique may be an alternative to other more laborious methods of assessing the PC labelling index. Thus, patients with > 3% S-phase PC detected by FCM have an adverse prognosis and this parameter is one of the most important independent prognostic criteria for predicting survival in MM patients. Moreover, the number of S-phase PC, together with other prognostic factors, such as beta 2microglobulin, age and performance status can be a very useful tool for stratifying patients into groups in order to establish risk-directed therapeutic protocols. 相似文献
104.
105.
106.
107.
108.
Studies have been made of non-specific effect of suboesophageal gnaglion on excitability of the segmental centers in the cockroach P. americana. It was shown that the electrical stimulation of the ganglion increases the frequency of the spontaneous activity and decreases the threshold of the evoked reactions in neurons of the metathoracic ganglion. The level of activation depends on the intensity of stimulation. Application of GABA (0.1 M) to the suboesophageal ganglion decreases the frequency of the background activity in the segmental neurons, this effect being presumably due to activation of the inhibitory structures. The descending influences from the suboesophageal ganglion may spread to centers of the metathoracic ganglion along monosynaptic pathways. 相似文献
109.
110.
Uterine inversion is a rare condition that occurs in various degrees. Predisposing and etiologic factors are discussed, as are therapy and prophylaxis. These points are illustrated by 4 own cases and by 172 cases collected from literature. 相似文献