全文获取类型
收费全文 | 681篇 |
免费 | 37篇 |
国内免费 | 4篇 |
出版年
2021年 | 6篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 11篇 |
2016年 | 21篇 |
2015年 | 27篇 |
2014年 | 22篇 |
2013年 | 34篇 |
2012年 | 26篇 |
2011年 | 29篇 |
2010年 | 31篇 |
2009年 | 28篇 |
2008年 | 24篇 |
2007年 | 23篇 |
2006年 | 24篇 |
2005年 | 22篇 |
2004年 | 32篇 |
2003年 | 14篇 |
2002年 | 22篇 |
2001年 | 22篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 10篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 9篇 |
1993年 | 10篇 |
1992年 | 6篇 |
1991年 | 10篇 |
1988年 | 18篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1982年 | 16篇 |
1980年 | 5篇 |
1979年 | 9篇 |
1978年 | 6篇 |
1977年 | 8篇 |
1975年 | 5篇 |
1973年 | 7篇 |
1972年 | 5篇 |
1971年 | 7篇 |
1970年 | 8篇 |
1969年 | 7篇 |
1967年 | 7篇 |
1966年 | 7篇 |
1887年 | 4篇 |
排序方式: 共有722条查询结果,搜索用时 15 毫秒
721.
A Gola D Wo?owiec S Potoczek 《Polski tygodnik lekarski (Warsaw, Poland : 1960)》1991,46(37-39):697-699
The possible interaction between hematopoietic neoplasms and ischemia of the lower limbs in patients with both pathologies was subjected to analysis. Anaemia, polycythemia, thrombocythemia, increased leucocytosis in the peripheral blood, and hyperuricemia exerted unfavourable effect on the blood flow through the arteries of the lower limbs. In some cases effective cytostatic treatment diminished the ischemia of the lower limbs. Interactions between various drugs used in the chronic treatment of both pathologies in the same patient was also examined. 相似文献
722.
Investigations were carried out to determine the sites of lead uptake within the frond and the root ofLemna minor. With the sodium rhodizonate four regions favoured in lead uptake were distinguished: the frond region between the base and
the node, the basal part of the root, and the regions at the proximal and distal ends of the root cap. For analysis in electron
microscope only the root regions were chosen. The highest rate of lead uptake was found in the basal part of the root. Lead
was present in the apoplast of this region after 5 min of exposure and was observed in the stelar cells after 30 min of incubation.
Lead deposits were detected mostly in the cell walls adjacent to the plasma membrane and in the lumen of several endomembrane
compartments - the endoplasmic reticulum (ER), dictyosomal vesicles, nuclear envelope and the vacuoles. Lead induced changes
of cell ultrastructure; an increase in the number of membraneous structures, swelling of ER cisternae and distortion of the
dictyosomal cisternae were observed after 2 to 6 h of exposure.
We wish to thank Mrs. G. Winiecka for her technical assistance in preparing the photographs. 相似文献