全文获取类型
收费全文 | 146042篇 |
免费 | 10613篇 |
国内免费 | 514篇 |
专业分类
耳鼻咽喉 | 1830篇 |
儿科学 | 3502篇 |
妇产科学 | 3255篇 |
基础医学 | 18884篇 |
口腔科学 | 3052篇 |
临床医学 | 14350篇 |
内科学 | 31513篇 |
皮肤病学 | 2125篇 |
神经病学 | 13092篇 |
特种医学 | 5273篇 |
外国民族医学 | 5篇 |
外科学 | 24626篇 |
综合类 | 1871篇 |
现状与发展 | 1篇 |
一般理论 | 151篇 |
预防医学 | 10503篇 |
眼科学 | 3568篇 |
药学 | 9075篇 |
中国医学 | 213篇 |
肿瘤学 | 10280篇 |
出版年
2023年 | 848篇 |
2022年 | 1586篇 |
2021年 | 3318篇 |
2020年 | 1866篇 |
2019年 | 2889篇 |
2018年 | 3388篇 |
2017年 | 2408篇 |
2016年 | 2723篇 |
2015年 | 3188篇 |
2014年 | 4556篇 |
2013年 | 6450篇 |
2012年 | 9635篇 |
2011年 | 9877篇 |
2010年 | 5529篇 |
2009年 | 5036篇 |
2008年 | 8788篇 |
2007年 | 9537篇 |
2006年 | 9026篇 |
2005年 | 8999篇 |
2004年 | 8662篇 |
2003年 | 8086篇 |
2002年 | 7909篇 |
2001年 | 1300篇 |
2000年 | 1049篇 |
1999年 | 1292篇 |
1998年 | 1699篇 |
1997年 | 1465篇 |
1996年 | 1205篇 |
1995年 | 1199篇 |
1994年 | 1048篇 |
1993年 | 950篇 |
1992年 | 927篇 |
1991年 | 845篇 |
1990年 | 749篇 |
1989年 | 727篇 |
1988年 | 689篇 |
1987年 | 691篇 |
1986年 | 676篇 |
1985年 | 757篇 |
1984年 | 918篇 |
1983年 | 955篇 |
1982年 | 1142篇 |
1981年 | 1067篇 |
1980年 | 1025篇 |
1979年 | 625篇 |
1978年 | 679篇 |
1977年 | 714篇 |
1976年 | 622篇 |
1975年 | 538篇 |
1974年 | 478篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
Prof. Dr. Alexander Kapp Prof. Dr. Bettina Wedi 《Der Hautarzt; Zeitschrift für Dermatologie, Venerologie, und verwandte Gebiete》2006,57(10):854-854
Ohne Zusammenfassung 相似文献
73.
Jennifer Tuboku-Metzger Blakely Ronda L Sinkowitz-Cochran William R Jarvis 《Infection control and hospital epidemiology》2006,27(8):873-875
A 19-item survey instrument was designed and mailed by the Infectious Diseases Society of America to its membership to determine the media preferred by infectious diseases physicians for continuing medical education on general topics and on antimicrobial resistance. The objective of the survey was to offer the developers of educational programs knowledge on which to base more-effective ways to deliver educational materials to physicians in this specialty. 相似文献
74.
Maren T Scheuner William C Whitworth Henraya McGruder Paula W Yoon Muin J Khoury 《Genetics in medicine》2006,8(8):525-531
PURPOSE: We examined the performance of a familial risk assessment method that stratifies risk for early-onset coronary heart disease by considering the number of relatives with coronary disease, degree of relationship, lineage, and age at diagnosis. METHODS: By using data from the HealthStyles 2003 survey, we assessed the associations between familial risk and early-onset coronary heart disease, diabetes, hypercholesterolemia, hypertension, and obesity. By using area under the curve statistics, we evaluated the discriminatory ability of various risk assessment models. RESULTS: Of 4,035 respondents, 60% were female and 72% were white, with a mean age of 48.8 years. After adjustment for demographics, strong and moderate risk were significantly associated with approximately a five- and twofold risk of early-onset coronary disease, respectively. After adjustment for demographics and personal history of cardiovascular disease, strong familial risk was also significantly associated with diabetes, hypercholesterolemia, hypertension, and obesity. A risk assessment model that included familial risk, demographics, and personal history of diabetes, hypercholesterolemia, hypertension, and obesity was most optimal with an area under the curve statistic of 87.2% CONCLUSIONS: Familial risk assessment can stratify risk for early-onset coronary heart disease. Several conditions associated with increased familial risk can be prevented. These results have important implications for risk assessment and risk-reducing interventions. 相似文献
75.
Sina Alexander Debbie M Nathan Melvyn G Korman 《Clinical gastroenterology and hepatology》2006,4(5):661; author reply 661-661; author reply 662
76.
BACKGROUND: Diffuse peritubular capillary (PTC) C4d deposition has been shown to be associated with relatively poor graft outcome. The significance of focal PTC C4d staining in the early post-transplant period is uncertain. METHODS: Sixty-five biopsies from 53 patients with acute rejection were graded (Banff '97 criteria), stained for C4d, monocytes and T cells, and divided into three groups according to PTC C4d: (i) focal C4d (F) (14 biopsies, 14 patients), (ii) diffuse C4d (D) (23 biopsies, 15 patients) and (iii) no C4d (N) (28 biopsies, 24 patients). The three groups were compared with respect to a variety of biopsy and clinical parameters including outcome. RESULTS: The incidence of transplant glomerulitis and glomerular monocyte infiltration were significantly greater in F (64% and 2.0+/-2.0) and D (57% and 3.4+/-2.0) than in N (11% and 0.2+/-0.2). A significantly higher proportion of F (93%) demonstrated acute cellular rejection (Banff '97 grade > or = 1A) than did D (35%). The F and D groups included significantly more females (50 and 67%, respectively) than did N (21%). The percentage of patients with a second or third transplant was higher in F (29%) and D (40%) than in N (8%) (P = 0.0589). The proportion of patients with glomerular filtration rate < 30 ml/min at 12, 24 and 48 months was higher in the D and F groups than in the N, and there was a statistically significant increasing trend in odds of this outcome occurring at 48 months across the three groups (D > F > N group) (P = 0.0416). CONCLUSION: The results suggest that the biopsy findings and clinical course in patients with focal PTC C4d staining are similar to those associated with diffuse C4d. 相似文献
77.
Dr. William A. Shaver MD Patrick Storms MD Dr. Walter L. Peterson MD 《Digestive diseases and sciences》1988,33(2):185-188
We have noted that colons of patients prepared for colonoscopy with Golytely, a nonabsorbable electrolyte lavage solution, frequently contain foam which may obscure small mucosal lesions. Therefore, a randomized, blinded controlled trial was performed to determine the prevalence of Golytely-induced foam and the effect of supplemental simethicone in decreasing the prevalence of foam. Foam was present in 32% of colons prepared with Golytely alone but in none of the colons prepared with Golytely supplemented with simethicone. In addition, only 5% of colons prepared with supplemental simethicone had residual stool noted at the time of colonoscopy, a significant improvement over the 39% prevalence of residual stool in colons prepared with Golytely alone. Addition of simethicone to Golytely lavage decreases the prevalence of colonic foam and residual stool. 相似文献
78.
Cardiovascular calcification in end-stage renal disease. 总被引:13,自引:1,他引:12
Cardiovascular diseases are common in patients with end-stage renal disease (ESRD) and cardiovascular morbidity and mortality among dialysis patients are substantially higher than in the general population. The reasons for this high incidence are multiple. They include traditional factors such as hypertension, diabetes, dyslipidaemia, sodium overload, and elevated homocysteine levels as well as disturbances of mineral metabolism, specifically abnormalities in phosphorus and calcium homeostasis. This review will describe the specific cardiovascular complications related to calcifications in ESRD, the implications of the abnormalities of mineral metabolism in its pathogenesis and the current imaging techniques available for the detection of cardiovascular calcifications. Excess of calcium load contributes to the development of cardiac calcifications; therefore, alternative strategies to diminish exogenous calcium load should be considered in patients with ESRD. 相似文献
79.
Predictors of clustering of tuberculosis in Greater Vancouver: a molecular epidemiologic study 总被引:3,自引:0,他引:3 下载免费PDF全文
80.