全文获取类型
收费全文 | 1755篇 |
免费 | 106篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 137篇 |
妇产科学 | 15篇 |
基础医学 | 149篇 |
口腔科学 | 36篇 |
临床医学 | 262篇 |
内科学 | 381篇 |
皮肤病学 | 17篇 |
神经病学 | 106篇 |
特种医学 | 223篇 |
外科学 | 111篇 |
综合类 | 46篇 |
预防医学 | 186篇 |
眼科学 | 8篇 |
药学 | 119篇 |
1篇 | |
肿瘤学 | 69篇 |
出版年
2021年 | 20篇 |
2020年 | 12篇 |
2019年 | 22篇 |
2018年 | 18篇 |
2017年 | 22篇 |
2016年 | 28篇 |
2015年 | 28篇 |
2014年 | 30篇 |
2013年 | 45篇 |
2012年 | 50篇 |
2011年 | 60篇 |
2010年 | 56篇 |
2009年 | 67篇 |
2008年 | 58篇 |
2007年 | 41篇 |
2006年 | 55篇 |
2005年 | 51篇 |
2004年 | 32篇 |
2003年 | 41篇 |
2002年 | 46篇 |
2001年 | 34篇 |
2000年 | 38篇 |
1999年 | 48篇 |
1998年 | 88篇 |
1997年 | 85篇 |
1996年 | 93篇 |
1995年 | 61篇 |
1994年 | 54篇 |
1993年 | 46篇 |
1992年 | 25篇 |
1991年 | 30篇 |
1990年 | 18篇 |
1989年 | 44篇 |
1988年 | 44篇 |
1987年 | 44篇 |
1986年 | 32篇 |
1985年 | 40篇 |
1984年 | 28篇 |
1983年 | 29篇 |
1982年 | 21篇 |
1981年 | 26篇 |
1980年 | 16篇 |
1979年 | 19篇 |
1978年 | 22篇 |
1977年 | 16篇 |
1976年 | 14篇 |
1975年 | 15篇 |
1973年 | 9篇 |
1972年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有1872条查询结果,搜索用时 31 毫秒
31.
PJ Hallam P. Mannucci A. Tripodi D. Bevan B. Lawsen L. Tengborn A. Wacey DN Coopel 《Clinical genetics》1998,54(3):231-233
Hallam PJ, Mannucci P, Tripodi A, Bevan D, Laursen B, Tengborn L, Wacey A, Cooper DN. Three novel PROC gene lesions causing protein C deficiency. Clin Genet 1998: 54: 231–233. 0 Munksgaard, 1998
Missense mutations. three of them novel (Am210→Val, Asn248→ Ile, Ah355→Val), were found in the protein c ( PROC ) genes of 7 patients with inherited protein C deficiency associated with venous thrombosis. Comparison with the phenotypic effects of mutations in the analogous residues of factor IX causing hdernophilia B and the use of molecular modelling has provided explanations as to how these lesions might alter either the structure, function or secretion of the protein C molecules encoded. 相似文献
Missense mutations. three of them novel (Am210→Val, Asn248→ Ile, Ah355→Val), were found in the protein c ( PROC ) genes of 7 patients with inherited protein C deficiency associated with venous thrombosis. Comparison with the phenotypic effects of mutations in the analogous residues of factor IX causing hdernophilia B and the use of molecular modelling has provided explanations as to how these lesions might alter either the structure, function or secretion of the protein C molecules encoded. 相似文献
32.
33.
34.
Hemoglobin Setif produces pseudosickling of red cells in vitro; the nature of the process and the conditions that "trigger" it are unknown. Studies of red cells, hemolysates, purified hemoglobin solutions, and artificial mixtures of Hb A and Setif suggest that pseudosickling is produced by intracellular crystallization of insoluble hemoglobin. Increased tonicity of the suspending medium accentuates the process, probably by causing a rise in intracellular hemoglobin concentration. If precipitates from A/Setif mixtures are analyzed, they always contain Hb A, suggesting an unusual mechanism for the process. Despite the fact that osmolality in the renal medulla is similar to that which produces pseudosickling in vitro, carriers do not have renal dysfunction of the type found in patients with sickle cell disease. 相似文献
35.
36.
A Sundaram D C Villeneuve I Chu V Secours G C Becking 《Drug and chemical toxicology》1980,3(1):105-134
Photomirex (8-monohydromirex) was administered to female Sprague-Dawley rats at dietary levels of 0.2, 1.0, 5.0, 25.0 and 125 ppm. Food intake and body weight gain were significantly depressed at the 125 ppm level in the 28- but not in the 90-day study. Significant alterations were observed in some hematological and biochemical parameters at the highest dietary level in the 90-day study. Photomirex residues accumulated in a dose-dependent manner in perirenal fat, liver, brain, kidney, and spleen. Dose-dependent histotoxic effects were observed in liver and thyroid at and above 1 ppm; hepatomegaly was observed at 25.0 and 125 ppm. These results indicate that photomirex was approximately five times more toxic than mirex in terms of liver histology. When these results are compared with those observed in an earlier study in the male rat, it is evident that the female is less susceptible to photomirex than the male. 相似文献
37.
MJ Stevens PD Stricker J Saalfeld PC Brenner R Kooner GFA O'Neill PJ Duval RS Jagavkar P Cross J Martland 《Journal of Medical Imaging and Radiation Oncology》2003,47(2):152-160
Combination high dose rate brachytherapy (HDRB) and external beam radiation therapy is technically and clinically feasible as definitive treatment for localized prostate cancer. We report the first large Australian experience using this technique of radiation dose escalation in 82 patients with intermediate‐ and high‐risk disease. With a median follow up of 3 years (156 weeks), complications were low and overall prostate‐specific antigen progression‐free survival was 91% using the American Society for Therapeutic Radiology and Oncology consensus definition. The delivery of hypofractionated radiation through the HDRB component shortens overall treatment time and is both biologically and logistically advantageous. As a radiation boost strategy, HDRB is easy to learn and could be introduced into most facilities with brachytherapy capability. 相似文献
38.
Screening for complement deficiency in bacterial meningitis 总被引:1,自引:0,他引:1
T Ernst PJ Späth C Aebi UB Schaad MG Bianchetti 《Acta paediatrica (Oslo, Norway : 1992)》1997,86(9):1009-1010
Seventy-seven children with bacterial meningitis were screened for complement deficiency. Both the classical and the alternate pathways were normal in 75 patients. Transiently reduced total haemolytic activity of the classical pathway was documented in a boy with meningococcal meningitis. Total haemolytic activity of both the classical and the alternate pathways were reduced in another patient with pneumococcal meningitis: individual complement components determination indicated predominant activation of the alternate pathway. 相似文献
39.
JJ Rangasami DC Greenwood B McSporran PJ Smail CC Patterson NR Waugh 《Archives of disease in childhood》1997,77(3):210-213
OBJECTIVES: To calculate the incidence of type 1 diabetes in Scottish children aged less than 15 years between 1984 and 1993; to examine changes in incidence; and to calculate the prevalence of diabetes at the end of this period. DESIGN: Three data sources were used to construct the Scottish Study Group for the Care of Young Diabetics register: active reporting of all new cases; reports from the Scottish Morbidity Register 1; and local registers. SUBJECTS: All children resident in Scotland diagnosed with primary insulin dependent diabetes mellitus when less than 15 years of age between 1984 and 1993. MAIN OUTCOME MEASURES: Annual incidence and prevalence rate for Scotland; time trend in incidence over the 10 years; differences in incidence between the three different age groups; and completeness of the register. RESULTS: The average annual incidence for Scotland was 23.9/100,000 children. The prevalence rate was 1.5/1000 in 1993. A total of 2326 cases was identified from the three sources. Capture-recapture analysis suggests a case ascertainment of 98.6%. The annual incidence rates increased at a rate of 2% each year (rate ratio = 1.02, 95% confidence interval (CI) 1.01 to 1.03). The incidence was higher in boys than girls (rate ratio = 1.08, 95% CI 1.00 to 1.18), and the incidence rates increased with age: 15.3/100,000/year for age 0-4 years, 24.4/ 100,000/year for age 5-9 years, and 31.9/ 100,000/year for age 10-14 years. CONCLUSIONS: The incidence of type 1 diabetes in Scotland is increasing and the prevalence is relatively high. These findings have important implications for health service resource allocation. The Scottish Study Group for the Care of Young Diabetics' register provides a base for monitoring and research. 相似文献
40.