首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2525篇
  免费   2篇
儿科学   10篇
妇产科学   1926篇
基础医学   6篇
口腔科学   35篇
临床医学   95篇
内科学   73篇
皮肤病学   3篇
神经病学   30篇
特种医学   21篇
外科学   197篇
综合类   2篇
预防医学   106篇
眼科学   4篇
药学   3篇
中国医学   2篇
肿瘤学   14篇
  2013年   15篇
  2010年   11篇
  2009年   25篇
  2007年   9篇
  2006年   10篇
  2003年   10篇
  2002年   6篇
  2001年   17篇
  2000年   26篇
  1999年   147篇
  1998年   141篇
  1997年   162篇
  1996年   169篇
  1995年   116篇
  1994年   156篇
  1993年   95篇
  1992年   90篇
  1991年   107篇
  1990年   49篇
  1989年   83篇
  1988年   69篇
  1987年   56篇
  1986年   72篇
  1985年   89篇
  1984年   64篇
  1983年   60篇
  1982年   63篇
  1981年   69篇
  1980年   45篇
  1979年   41篇
  1978年   27篇
  1977年   36篇
  1976年   39篇
  1975年   33篇
  1974年   34篇
  1973年   39篇
  1972年   27篇
  1971年   21篇
  1970年   35篇
  1969年   34篇
  1968年   9篇
  1967年   11篇
  1966年   10篇
  1965年   6篇
  1964年   8篇
  1963年   6篇
  1961年   15篇
  1960年   16篇
  1958年   10篇
  1957年   9篇
排序方式: 共有2527条查询结果,搜索用时 46 毫秒
41.
42.
A prospective study of biochemical changes after vertical banded gastroplasty for morbid obesity, in 94 patients (10 males and 84 females, ages ranging from 18 to 59 years) has been carried out. Liver function tests and electrolyte estimations were performed preoperatively, during hospitalisation for surgery, at 6 weeks and at 6 months postoperatively, and demonstrated no significant changes in liver function in these patients 6 months after surgery. The study concludes that there is no increase in the risk of liver damage or electrolyte disturbance after vertical gastroplasty, but that there may be subtle hepatic changes present as gall bladder disease developed in 18 patients postoperation (19%).  相似文献   
43.
44.
Urogenital ageing and its effect on sexual health in older British women   总被引:4,自引:0,他引:4  
Objective To provide information on the extent of problems of urogenital ageing in older British women.
Design A MORI survey of a representative population sample of older British women.
Setting Home interviews.
Participants Two thousand and forty-five women aged 55–85+.
Results Urogenital symptoms had affected 48.8% of the women at some time, but no more than 11% were currently affected by individual symptoms; however, these were often of long duration. The majority (73%) were not sexually active, with lack of a partner being a factor for many. There was also a decreasing prevalence of sexual activity with increasing age. Those sexually active in the 65–74 year old age group (   n = 148  ) tended to have a similar sexual frequency (at least once per month) compared with the younger women studied. Approximately 12% of those who reported dyspareunia and/or vaginal dryness claimed a severe problem; 33% did not seek professional advice and 36% resorted to an over the counter remedy. Use of hormone replacement therapy was generally of relatively short duration. There was a declining gradient of ever-use with age.
Conclusions The extent of significant urogenital symptoms is relatively low, but some women are seriously affected and use self-help as well as professional assistance. The extent of sexual activity in older women and factors affecting this have been defined, and the effect of urogenital symptoms on sexual activity demonstrated.  相似文献   
45.
Objective To measure the gain in quality of life due to hormone replacement therapy for women with mild and severe menopausal symptoms.
Design Prospective study where data on quality of life and willingness to pay were collected by interview.
Setting Department of Gynaecology at Sodertalje Hospital near Stockholm.
Participants One hundred and four women aged 45 to 65 years treated for menopausal symptoms for at least one month.
Methods Quality oflife was measured by the time tradeoff and rating scale methods. The willingness to pay for hormone replacement therapy was investigated using the contingent valuation method.
Main outcome measures The quality adjusted life year weight measured with the rating scale and time tradeoff methods, and willingness to pay.
Results The increase in the quality adjusted life year weight due to hormone replacement therapy for women with mild symptoms was 0.26 according to the rating scale method and 0.18 according to the time tradeoff method. For women with severe symptoms the quality adjusted life year weight increased by 0.50 according to the rating scale method and by 0.42 according to the time tradeoff method. The mean willingness to pay for hormone replacement therapy per month was 2300 Swedish krone for women with mild symptoms and 4800 Swedish krone for women with severe symptoms (£1 = 10.3 Swedish krone).
Conclusions Hormone replacement therapy leads to a major improvement in quality of life for women with menopausal symptoms. Both for women with mild and severe menopausal symptoms the willingness to pay for the treatment also greatly exceeds the costs, indicating that hormone replacement therapy is economically beneficial for women with menopausal symptoms.  相似文献   
46.
47.
We undertook criterion-based audit of the current practice of prescribing hormone replacement therapy for women with acute myocardial infarction; the audit included 181 consecutive women admitted to one hospital with this diagnosis in one calendar year. The set standard was that, barring any contraindication, all postmenopausal women with acute myocardial infarction should be prescribed hormone replacement therapy before discharge from hospital. The evidence base of this standard derives from more than 30 epidemiological and clinical studies and a large body of biological data. Only 4.7% of the women were current users of hormone replacement therapy and the set standard was met in only 3% of eligible nonusers. Professionals caring for women who have had a myocardial infarction need to consider hormone replacement therapy as a secondary prophylaxis of myocardial infarction. Gynaecologists should liaise with colleagues in other specialties and general practice to ensure that information on the nongynaecological benefits of hormone replacement therapy is widely disseminated.  相似文献   
48.
Objective To evaluate vascular endothelial function in isolated small arteries from women with gestational diabetes.
Methods Small subcutaneous arteries (mean luminal diameter ∼ 250μm) were dissected from biopsies obtained at caesarean section in 14 normotensive women with gestational diabetes and in 18 normotensive nondiabetic pregnant women. Vascular function was determined after mounting the arteries on a small vessel myograph.
Results Pre-constricted arteries from gestational diabetic pregnant women demonstrated poor relaxation to acetylcholine, an endothelium-dependent vasodilator (pEC50, mean [SE], 6.98 [0.10] vs normal pregnant, 7.28 [0.08],   P < 0.03  ; % maximum relaxation, median [range], 88.2 [42.4–994] vs normal pregnant 94.2 [71.8–100.0],   P < 0.01  ). In the presence of indomethacin relaxation to acetylcholine was similar in both groups suggesting a deficiency in dilator prostaglandin synthesis in the arteries from the diabetic women. The nitric oxide synthase inhibitor N -monomethyl-L-arginine further reduced sensitivity of arteries to acetylcholine but to a similar degree in both normal pregnant and gestational diabetic women. Relaxation to sodium nitroprusside, an indicator of sensitivity of the vascular smooth muscle to nitric oxide, was similar in both groups.
Conclusions Maternal vascular endothelial dysfunction may contribute to the increased incidence of cardiovascular disorders in women with gestational diabetes.  相似文献   
49.
Objective To investigate the correlation between soluble forms of the intercellular adhesion molecule (SICAM-1) and vascular cell adhesion molecule (sVCAM-1) and the severity of pre-eclampsia or its possible consequences for fetal growth.
Design Prospective observational study.
Setting Institute of Medical Genetics, University of Oslo, Department of Medical Genetics and Haematological Research Laboratory, Ullevål University Hospital; and the Department of Obstetrics and Gynaecology, The National Hospital, Oslo, Norway.
Participants Seventy-six women with normotensive pregnancies and 157 women with pre-eclampsia divided into three subgroups: mild, severe and pre-eclampsia with fetal growth retardation.
Methods ELISA-measurements of plasma SICAM-1 and sVCAM-1 were performed in a group of healthy pregnant normotensive women and three groups of women with varying degrees of pre-eclampsia.
Results SICAM-1 concentrations were higher in the pre-eclampsia group compared with the control group, but this difference was not statistically significant. Plasma concentrations of sVCAM-1 were significantly greater ( P < 0.0001) in all pre-eclampsia subgroups (835.34, 855.25 and 964.05 ng/mL) compared with the control group (667.62 ng/mL). Within the pre-eclampsia group, plasma concentration of sVCAM-1 was significantly higher in the subgroup exhibiting fetal growth retardation ( P = 0.03) compared with mild pre-eclampsia.
Conclusion The observed increases in plasma concentrations of sVCAM-1 suggest that measurements of this adhesion molecule may be useful in monitoring pregnancies with respect to the development of pre-eclampsia or fetal growth retardation.  相似文献   
50.
We have investigated the ploidy profile of morphologically normal mucosa adjacent to high grade CIN (   n = 16  ) and also from normal cervix ( n = 18). DNA ploidy was assessed using flow cytometry and image analysis. All cases were diploid by both modalities. Our results show that morphologically normal squamous mucosa has a stable ploidy profile even when it lies adjacent to high grade CIN. This finding supports the view that high grade CIN is a neoplastic expansion of transformed cells rather than the result of a field change effect.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号