全文获取类型
收费全文 | 3905篇 |
免费 | 335篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 143篇 |
妇产科学 | 101篇 |
基础医学 | 491篇 |
口腔科学 | 137篇 |
临床医学 | 455篇 |
内科学 | 674篇 |
皮肤病学 | 27篇 |
神经病学 | 427篇 |
特种医学 | 329篇 |
外科学 | 494篇 |
综合类 | 115篇 |
预防医学 | 443篇 |
眼科学 | 30篇 |
药学 | 242篇 |
中国医学 | 2篇 |
肿瘤学 | 149篇 |
出版年
2021年 | 45篇 |
2020年 | 29篇 |
2019年 | 54篇 |
2018年 | 64篇 |
2017年 | 54篇 |
2016年 | 41篇 |
2015年 | 64篇 |
2014年 | 81篇 |
2013年 | 105篇 |
2012年 | 161篇 |
2011年 | 158篇 |
2010年 | 109篇 |
2009年 | 92篇 |
2008年 | 162篇 |
2007年 | 209篇 |
2006年 | 151篇 |
2005年 | 160篇 |
2004年 | 133篇 |
2003年 | 153篇 |
2002年 | 134篇 |
2001年 | 105篇 |
2000年 | 107篇 |
1999年 | 103篇 |
1998年 | 91篇 |
1997年 | 101篇 |
1996年 | 120篇 |
1995年 | 78篇 |
1994年 | 60篇 |
1993年 | 65篇 |
1992年 | 89篇 |
1991年 | 77篇 |
1990年 | 88篇 |
1989年 | 118篇 |
1988年 | 94篇 |
1987年 | 71篇 |
1986年 | 88篇 |
1985年 | 82篇 |
1984年 | 50篇 |
1983年 | 38篇 |
1982年 | 35篇 |
1981年 | 32篇 |
1979年 | 32篇 |
1978年 | 27篇 |
1977年 | 31篇 |
1976年 | 25篇 |
1975年 | 25篇 |
1973年 | 23篇 |
1972年 | 21篇 |
1971年 | 38篇 |
1969年 | 23篇 |
排序方式: 共有4270条查询结果,搜索用时 31 毫秒
1.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome. 相似文献
2.
3.
S F Wong A Lee-Tannock D Amaraddio F Y Chan H D McIntyre 《Ultrasound in obstetrics & gynecology》2006,28(7):934-938
OBJECTIVE: To assess the effect of glucose control on the rate of growth of fetuses in women with pregestational diabetes mellitus (Types 1 and 2). METHODS: All pregestational diabetic women booked at Mater Mothers' Hospital, Brisbane, Australia, between 1 January 1994 and 31 December 2002, were included. Pregnancies with congenital fetal anomalies, multiple pregnancies, and pregnancies terminated prior to 20 weeks' gestation were excluded. Dating scans were performed before 14 weeks' gestation and serial scans were performed at 18, 24, 28, 32 and 36 weeks. Fetal parameters, including biparietal diameter, femur length and abdominal circumference, were recorded. The daily growth rates for biparietal diameter, femur length, and fetal abdominal area were calculated and compared with those in a low-risk (non-diabetic) population. The growth rates in fetuses of women with satisfactory diabetic control (HbA1c < 6.5%) and unsatisfactory control (HbA1c > or = 6.5%) in the three trimesters were compared. RESULTS: A total of 174 diabetic pregnancies were included and a total of 997 ultrasound scans were performed. The growth rates for fetuses of mothers with diabetes mellitus were significantly higher than for those in the low-risk population. The z-scores for biparietal diameter, femur length, and fetal abdominal area were 0.18, 0.59 and 1.44, respectively. Fetuses of diabetic mothers with high HbA1c in the first trimester had significantly greater fetal abdominal area growth rate than those with normal HbA1c (fetal abdominal area z-score of 1.7 vs. 0.75, P = 0.009). Although the fetal abdominal area z-scores in fetuses of diabetic mothers with high HbA1c in the second or third trimesters were also higher than those with normal HbA1c levels, the differences did not reach statistical significance. Maternal obesity did not influence the fetal growth rate. CONCLUSION: The rate of growth of fetuses of diabetic mothers differs from that of the normal population. Growth acceleration persists until the late third trimester. Moreover, periconceptional glucose control appears to have a significant effect on accelerated growth of the fetal abdominal area. 相似文献
4.
Karen MacKinnon Marjorie McIntyre 《Revue canadienne de recherche en sciences infirmières》2006,38(2):56-72
With the recent introduction of preterm birth prevention programs there has been a shift in our understanding of what the presence of contractions during pregnancy means and a reconstituting of risk in ways that position increasing numbers of women at risk for preterm birth. This paper highlights the findings of a study exploring the influences of risk discourses on women's experiences of preterm labour. The primary goals of this institutional ethnographic study were to describe the effects of societal discourses, institutional structures, and nursing work processes on the everyday lives of childbearing women experiencing preterm labour. The findings suggest that risk discourses exert social control over pregnant women and result in fear, guilt, feelings of being judged or punished, and an overwhelming sense of personal responsibility for preventing preterm birth.The study also exposes ways in which biomedical constructions of risk and preterm labour affect the organization of health services, including nursing practice. 相似文献
5.
6.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
7.
Advanced age has been associated with a wide range of defects in both the innate and adaptive immune systems including diminished specific antibody responses that increase the risk of invasive pneumococcal disease (IPD) and limit the effectiveness of vaccines. However, the elderly are a heterogeneous group and measures of overall frailty may be a better indicator of disease susceptibility (or vaccine response) than chronological age alone. 相似文献
8.
A 64-year-old man had a prostatic sarcoma 8 years after transurethral prostatectomy and radical bilateral pelvic lymph node dissection with insertion of 125iodine implants for stage B1N carcinoma of the prostate. Therapy for the sarcoma consisted of isolated pelvic perfusion and then pelvic exenteration with creation of an ileal conduit and colostomy. The pathology report showed well encapsulated grade 2 spindle cell sarcoma of the prostate. Multiple small metallic particles were embedded in the tumor specimen. 相似文献
9.
10.
The Oxford panel of monoclonal antibodies was used to subtype 83 strains of Legionella pneumophila serogroup 1 of human and environmental origin. The International panel was also used to subtype 50 of them. All the 18 patients' isolates were of the Pontiac subgroup, and 40/43 of the environmental strains of the Pontiac subgroup were associated with human infection. The remaining environmental strains were subgroups Olda (15 strains), Camperdown (5 strains), and Bellingham (2 strains). The Philadelphia subgroup was the commonest among the environmental strains tested with the international MABs panel. This study confirms previous findings that L. pneumophila serogroup 1 isolates with the Pontiac (Oxford panel) or MAB-2 (international panel) reacting antigen marker seem to be more virulent than the other subgroups. 相似文献