全文获取类型
收费全文 | 5504篇 |
免费 | 373篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 87篇 |
儿科学 | 185篇 |
妇产科学 | 93篇 |
基础医学 | 777篇 |
口腔科学 | 30篇 |
临床医学 | 633篇 |
内科学 | 1409篇 |
皮肤病学 | 84篇 |
神经病学 | 390篇 |
特种医学 | 166篇 |
外科学 | 606篇 |
综合类 | 29篇 |
一般理论 | 2篇 |
预防医学 | 524篇 |
眼科学 | 72篇 |
药学 | 314篇 |
中国医学 | 10篇 |
肿瘤学 | 489篇 |
出版年
2023年 | 25篇 |
2022年 | 83篇 |
2021年 | 152篇 |
2020年 | 82篇 |
2019年 | 149篇 |
2018年 | 110篇 |
2017年 | 70篇 |
2016年 | 109篇 |
2015年 | 118篇 |
2014年 | 180篇 |
2013年 | 246篇 |
2012年 | 333篇 |
2011年 | 357篇 |
2010年 | 205篇 |
2009年 | 199篇 |
2008年 | 317篇 |
2007年 | 336篇 |
2006年 | 300篇 |
2005年 | 317篇 |
2004年 | 294篇 |
2003年 | 263篇 |
2002年 | 315篇 |
2001年 | 108篇 |
2000年 | 82篇 |
1999年 | 95篇 |
1998年 | 76篇 |
1997年 | 60篇 |
1996年 | 48篇 |
1995年 | 47篇 |
1994年 | 38篇 |
1993年 | 37篇 |
1992年 | 61篇 |
1991年 | 69篇 |
1990年 | 67篇 |
1989年 | 48篇 |
1988年 | 41篇 |
1987年 | 41篇 |
1986年 | 55篇 |
1985年 | 45篇 |
1984年 | 53篇 |
1983年 | 21篇 |
1982年 | 33篇 |
1981年 | 23篇 |
1980年 | 14篇 |
1979年 | 27篇 |
1978年 | 23篇 |
1977年 | 19篇 |
1976年 | 13篇 |
1975年 | 18篇 |
1974年 | 16篇 |
排序方式: 共有5900条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Nephronophthisis related to homozygous NPHP1 gene deletion as a cause of chronic renal failure in adults. 总被引:1,自引:0,他引:1
5.
F Mandelli G De Rossi P Mancini A Alberti A Cajozzo F Grignani P Leoni V Liso M Martelli A Neri 《Journal of clinical oncology》1987,5(3):398-406
Clinical and biological data were evaluated using Desu univariate analyses or Cox multivariate analyses in a series of 1,777 chronic lymphocytic leukemia (CLL) patients from an Italian Cooperative Group. In univariate analyses, age and sex of patients, presence of bone marrow (BM; greater than or equal to 50%), and peripheral blood (PB; greater than or equal to 60,000/microL) lymphocytosis, anemia (hemoglobin [Hb] less than 11 g/dL), thrombocytopenia (less than 100,000/microL), direct Coombs' test positivity, hepatomegaly, splenomegaly, and extent of lymph node involvement were shown to be of significant prognostic value. Multivariate analyses, through a stepwise procedure, showed that the most important prognostic variables are Hb, hepatomegaly, lymph node involvement, PB lymphocytosis, and age and sex of patients. Further covariates would produce an improvement having a nonsignificant P value. Based on the results of multivariate analyses, a four-step staging using the significant variables of the Cox model is proposed. 相似文献
6.
7.
Nicolas Pallet Eric Thervet Corinne Alberti Violaine Emal-Aglaé Janine Bedrossian Frank Martinez Carine Roy Christophe Legendre 《American journal of transplantation》2005,5(11):2682-2687
Despite recent improvement, significant racial disparities in outcome still persist after renal transplantation among African American patients in the United States. This study evaluated the association of race and ethnicity with allograft outcomes in a French population of 952 Caucasian (Cauc) patients and 140 African European (AE) patients who underwent renal transplantation in our center between 1987 and 2003. Demographic characteristics were similar for the two cohorts other than cause of end-stage renal failure (more hypertension among AE and more polycystic kidney disease among Cauc) and cold ischemia time (significantly longer for AE). Immunosuppressive treatment was comparable between groups. There were no significant differences between AE and Cauc in the incidence of acute rejection (31% vs. 30%). At 5 years post-transplant, patient survival (93% vs. 92%), graft survival (83% in both groups) and graft function (creatinine clearance 48 mL/min vs. 45 mL/min) were also similar among the AE and Cauc patients. We demonstrate that ethnic origin does not affect outcome after renal transplantation in France. Therefore, differences observed in the United States cannot be only related to immunologic or pharmacologic factors. The results of renal transplantation in patients of African origin could be improved with universal immunosuppressive drug coverage. 相似文献
8.
High prevalence of NIDDM and impaired glucose tolerance in Indian, Creole, and Chinese Mauritians. Mauritius Noncommunicable Disease Study Group 总被引:4,自引:0,他引:4
G K Dowse H Gareeboo P Z Zimmet K G Alberti J Tuomilehto D Fareed L G Brissonnette C F Finch 《Diabetes》1990,39(3):390-396
Mauritius, a multiethnic island nation in the southwestern Indian Ocean, has one of the world's highest diabetes mortality rates. The prevalence of both impaired glucose tolerance (IGT) and non-insulin-dependent diabetes mellitus (NIDDM) was investigated in 5080 Muslim and Hindu Indian, Creole (mixed African, European, and Indian origin), and Chinese Mauritian adults aged 25-74 yr who were selected by random cluster sampling. Based on a 75-g oral glucose tolerance test and World Health Organization criteria, the age-standardized prevalence of IGT was significantly greater in women (19.7%, 95% confidence interval [CI] 18.1-21.2) than in men (11.7%, CI 10.5-12.8). By contrast, the prevalence of NIDDM was similar in men (12.1%, CI 10.9-13.4) and women (11.7%, CI 10.5-12.8) for all ethnic groups combined. The sex difference in IGT prevalence was seen in all ethnic groups, but for NIDDM, the sex difference was not consistent across ethnic groups. However, age- and sex-standardized prevalence of IGT and NIDDM was remarkably similar across ethnic groups (16.2 and 12.4% in Hindu Indians, 15.3 and 13.3% in Muslim Indians, 17.5 and 10.4% in Creoles, and 16.6 and 11.9% in Chinese, respectively). Three new cases of diabetes were diagnosed for every two known cases. The high prevalence of abnormal glucose tolerance in Indian subjects is consistent with studies of other migrant Indian communities, but the findings in Creole and, in particular, Chinese subjects are unexpected. Potent environmental factors shared between ethnic groups in Mauritius may be responsible for the epidemic of glucose intolerance. 相似文献
9.
Regulation of ketogenesis, gluconeogenesis, and glycogen synthesis by insulin and proinsulin in rat hepatocyte monolayer cultures 总被引:5,自引:0,他引:5
The metabolic actions of porcine insulin and biosynthetic human proinsulin on fatty acid and glucose metabolism were studied in rat hepatocytes cultured in monolayer for 24 h. Our aim was to establish whether proinsulin action in the liver is similar to insulin action and whether the relative potencies of the two hormones are the same for different metabolic processes. Proinsulin and insulin exerted a similar maximal inhibitory effect on ketone body formation from palmitate and on gluconeogenesis from pyruvate. The half-maximal effective concentration of proinsulin was 11-13 times that of insulin. The antiketogenic effects of insulin and proinsulin were associated with an increased glycerol 3-phosphate content and a decreased affinity of carnitine palmitoyltransferase for its substrate palmitoyl-CoA. When the basal rate of ketogenesis was increased with isobutyl methylxanthine, the half-maximal effective concentrations of both proinsulin and insulin were decreased, but the relative potency of the two hormones was unchanged. Proinsulin and insulin exerted similar maximal stimulatory effects on glycogen synthesis and on the activities of pyruvate kinase, glucose 6-phosphate dehydrogenase, phosphogluconate dehydrogenase, and malic enzyme. The half-maximal effective concentration of proinsulin was 10-30 times that of insulin. These findings are consistent with receptor binding studies on liver membranes that suggest that proinsulin interacts with insulin-specific and not proinsulin-specific receptors. Our findings also suggest that proinsulin action does not differ from insulin action at a postreceptor site. 相似文献
10.