全文获取类型
收费全文 | 704篇 |
免费 | 50篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 10篇 |
妇产科学 | 9篇 |
基础医学 | 90篇 |
口腔科学 | 24篇 |
临床医学 | 72篇 |
内科学 | 126篇 |
皮肤病学 | 4篇 |
神经病学 | 59篇 |
特种医学 | 27篇 |
外国民族医学 | 1篇 |
外科学 | 92篇 |
综合类 | 4篇 |
预防医学 | 107篇 |
眼科学 | 10篇 |
药学 | 63篇 |
中国医学 | 1篇 |
肿瘤学 | 46篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 10篇 |
2018年 | 11篇 |
2017年 | 11篇 |
2016年 | 16篇 |
2015年 | 23篇 |
2014年 | 17篇 |
2013年 | 23篇 |
2012年 | 39篇 |
2011年 | 28篇 |
2010年 | 22篇 |
2009年 | 15篇 |
2008年 | 35篇 |
2007年 | 33篇 |
2006年 | 17篇 |
2005年 | 31篇 |
2004年 | 28篇 |
2003年 | 24篇 |
2002年 | 35篇 |
2001年 | 24篇 |
2000年 | 38篇 |
1999年 | 28篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 20篇 |
1991年 | 17篇 |
1990年 | 12篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1977年 | 4篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1972年 | 9篇 |
1969年 | 3篇 |
1968年 | 5篇 |
排序方式: 共有754条查询结果,搜索用时 0 毫秒
1.
T F Kruger J P Van der Merwe H J Odendaal F S Stander G M Grobler V A Hulme E L Erasmus K Coetzee M L Windt Y Swart 《Suid-Afrikaanse tydskrif vir geneeskunde》1990,77(12):634-636
The results of the in vitro fertilisation programme at Tygerberg Hospital for the period April 1983 to January 1988 are presented. Of the 1117 laparoscopies performed, 825 patients reached the transfer stage. A live-birth rate of 9.3% was achieved. The pregnancy rate after transfer of 4 embryos was 25.9% compared with 15.4% after 2 embryos and 10.8% after 3 embryos (P = less than 0.0001). The multiple pregnancy rate was 2.8% in the group receiving 2 embryos and 11.7% and 10.4% in those receiving 3 and 4 embryos, respectively. Of the 77 successful pregnancies (90 babies), 1 baby died at 34 weeks' gestation as the result of abruptio placentae due to preeclampsia and 1 cot death occurred. The only congenital abnormality encountered was a cleft palate. 相似文献
2.
3.
Several weeks after porcine retinal pigment epithelial (RPE) cell cultures attain confluence, macroscopically visible brown foci appear. The cuboidal cells that form the foci contain numerous phase dark granules that do not exhibit the autofluorescence characteristic of lipofuscin. The data described here indicate that the granules are melanosomes. Electron microscopy revealed three types of electron-dense granules in these cells: simple spheres 0.3-0.5 microns in diameter, large spheres 1-2 microns in diameter, and lysosomal aggregations of the smaller spheres. The matrix of both spheres is composed of 40-nm microvesicles that were also found free in the cytoplasm and aggregated within vacuolar structures. Reversed-phase high-performance liquid chromatography of RPE cells and their media detected melanogens, i.e. intermediates of melanin biosynthesis, including several indole derivatives. The porcine RPE cultures therefore may be a useful system for studying melanogenic regulation. 相似文献
4.
5.
M C Zillikens J W van den Berg J H Wilson G R Swart 《The American journal of clinical nutrition》1992,55(3):621-625
Bioelectrical impedance analysis (BIA) is a simple technique for determining body water and calculating body composition. It has been validated in healthy control subjects but not in patients with liver disease. We examined the ability of BIA to detect changes in total body water (TBW) due to removal of ascites. In 12 cirrhotic patients, BIA of the whole body and of body segments was performed before and after treatment of ascites with paracentesis (n = 12) and diuretics (n = 2). TBW changes predicted by BIA, by using two prediction equations, were significantly less than body weight changes (51% and 45% of the weight loss). BIA of body segments showed highly significant changes in both the trunk and the leg and small changes in the arm. These data indicate that BIA of the whole body is not a suitable technique for monitoring fluid changes in cirrhotic patients with ascites. Changes in BIA of body segments may be due to mobilization of edema after the removal of ascites. 相似文献
6.
People who are prone to motion sickness have a directional preponderance of nystagmus to the left. Centrifuging will change this preponderance to the right in most people, and at the same time reduce their tendency towards motion sickness but only with regard to air travel. 相似文献
7.
8.
Zola H Swart B Boumsell L Mason DY;IUIS/WHO Subcommittee 《Journal of immunological methods》2003,275(1-2):1-8
The 7th International Workshop on Human Leucocyte Differentiation Antigens (HLDA7) studied a number of newly characterised molecules relevant to human leucocyte differentiation and function. The HLDA organisation, which devised and continues to maintain the CD nomenclature, is responsible, under the auspices of IUIS and WHO, for the nomenclature of all leucocyte differentiation markers. The 7th Workshop redefined a number of (principally carbohydrate) molecules, and assigned CD names to approximately 80 new molecules. This update lists, in tabular form, the redefined and newly assigned names, together with antibodies, which have been confirmed under Workshop conditions as specific for the new and redefined molecules. The major features of the cellular expression patterns are summarised, and a LocusLink accession number provided to enable the reader to access more detailed information through http://www.ncbi.nlm.nih.gov/LocusLink. 相似文献
9.
Salganik MP Hardie DL Swart B Dandie GW Zola H Shaw S Shapiro H Tinckam K Milford EL Wand MP 《Journal of immunological methods》2005,305(1):67-74
The blind panel collected for the 8th Human Leucocyte Differentiation Antigens Workshop (HLDA8; ) included 49 antibodies of known CD specificities and 76 antibodies of unknown specificity. We have identified groups of antibodies showing similar patterns of reactivity that need to be investigated by biochemical methods to evaluate whether the antibodies within these groups are reacting with the same molecule. Our approach to data analysis was based on the work of Salganik et al. (in press) [Salganik, M.P., Milford E.L., Hardie D.L., Shaw, S., Wand, M.P., in press. Classifying antibodies using flow cytometry data: class prediction and class discovery. Biometrical Journal]. 相似文献
10.
T lymphocyte colony-forming cells (TL-CFC) present in the peripheral blood of healthy individuals have been studied by several investigators but an analysis of the properties of marrow TL-CFC is still lacking. The experiments reported here represent a first attempt to define some characteristic of marrow TL-CFC, in direct comparison with blood TL-CFC, using density gradients, rosette tests and stimulation of DNA synthesis. It was found that marrow TL-CFC and blood TL-CFC have different density properties. Both populations were characterized by distinct profiles with peaks at 1 . 07 g/ml and 1 . 065 g/ml respectively. In marrow as well as blood striking similarities between the density distributions of TL-CFC and E rosette-forming cells (E-RFC) were found. From E rosette Ficoll separation experiments it became clear that TL-CFC in bone marrow, as well as in blood, represent a subgroup of the E-RFC population. A marked dissociation was observed between the quantitative values of thymidine incorporation and colony responses following stimulation with PHA. The most prominent findings was that light-dense bone marrow-subfractions, which were virtually negative in PHA mitogen (DNA-synthesis) tests, still gave rise to relatively large numbers of T lymphocyte colonies after stimulation with PHA. On the contrary, in blood, T lymphocyte colonies could be grown exclusively from density fractions which were positive in PHA mitogen stimulation tests. Apparently, characteristics differences exist between marrow and blood TL-CFC. 相似文献