全文获取类型
收费全文 | 166617篇 |
免费 | 11472篇 |
国内免费 | 644篇 |
专业分类
耳鼻咽喉 | 1855篇 |
儿科学 | 4075篇 |
妇产科学 | 2804篇 |
基础医学 | 22949篇 |
口腔科学 | 3519篇 |
临床医学 | 16053篇 |
内科学 | 34761篇 |
皮肤病学 | 3417篇 |
神经病学 | 15612篇 |
特种医学 | 7380篇 |
外国民族医学 | 14篇 |
外科学 | 26184篇 |
综合类 | 1983篇 |
一般理论 | 110篇 |
预防医学 | 12180篇 |
眼科学 | 3517篇 |
药学 | 10870篇 |
2篇 | |
中国医学 | 247篇 |
肿瘤学 | 11201篇 |
出版年
2023年 | 832篇 |
2022年 | 1250篇 |
2021年 | 3469篇 |
2020年 | 2158篇 |
2019年 | 3209篇 |
2018年 | 3689篇 |
2017年 | 2880篇 |
2016年 | 3248篇 |
2015年 | 3733篇 |
2014年 | 5271篇 |
2013年 | 7064篇 |
2012年 | 10679篇 |
2011年 | 11385篇 |
2010年 | 6525篇 |
2009年 | 6243篇 |
2008年 | 10105篇 |
2007年 | 10561篇 |
2006年 | 10444篇 |
2005年 | 10516篇 |
2004年 | 9705篇 |
2003年 | 8986篇 |
2002年 | 8642篇 |
2001年 | 2287篇 |
2000年 | 1965篇 |
1999年 | 2244篇 |
1998年 | 2011篇 |
1997年 | 1633篇 |
1996年 | 1397篇 |
1995年 | 1302篇 |
1994年 | 1186篇 |
1993年 | 1059篇 |
1992年 | 1366篇 |
1991年 | 1255篇 |
1990年 | 1092篇 |
1989年 | 1039篇 |
1988年 | 975篇 |
1987年 | 927篇 |
1986年 | 929篇 |
1985年 | 926篇 |
1984年 | 971篇 |
1983年 | 834篇 |
1982年 | 1014篇 |
1981年 | 904篇 |
1980年 | 760篇 |
1979年 | 690篇 |
1978年 | 684篇 |
1977年 | 563篇 |
1976年 | 539篇 |
1974年 | 549篇 |
1973年 | 482篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
141.
Paul Hochstein Ulrich Glatzel Thomas Schmickal Andreas Wentzensen 《Trauma und Berufskrankheit》2002,4(2):s110-s114
The treatment of deep cartilage defects in load-bearing joints is a problem that still has no satisfactory solution. Full-thickness defects of the articular cartilage rarely heal spontaneously, usually leaving damage that can lead to early arthrosis. Techniques currently available for the treatment of chondral defects include abrasion, drilling, micro-fracturing, transplantation of tissue autografts and allografts, and cell transplantation. Osteochondral autograft transplantation is currently the only surgical cartilage repair technique known to lead to the formation of genuine hyaline articular cartilage and its retention at least in the medium term. The Draenert method, in which a water-cooled diamond bone-cutting system is used, is an effective procedure for resurfacing the joints affected by localised cartilaginous defects, even when there is also severe bone loss. Donor-side morbidity can be kept to a minimum by filling the defect caused by harvesting with a press-fit cylinder of cancellous bone covered with periosteum for protection. 相似文献
142.
Frank Lindseth Thomas Lang? Jon Bang Toril A Nagelhus Hernes 《Computer aided surgery》2002,7(4):197-222
143.
144.
Jenny Chang-Claude Silke Hermann Ursula Eilber Karen Steindorf 《Cancer epidemiology, biomarkers & prevention》2005,14(4):963-968
BACKGROUND: The long-term observation of vegetarians in affluent countries can provide insight into the relative effects of a vegetarian diet and lifestyle factors on mortality. METHODS: A cohort study of vegetarians and health-conscious persons in Germany was followed-up prospectively for 21 years, including 1,225 vegetarians and 679 health-conscious nonvegetarians. Standardized mortality ratios compared with the German general population were calculated for all causes and specific causes. Within the cohort, Poisson regression modeling was used to investigate the joint effects of several risk factors on overall and cause-specific mortality. RESULTS: Standardized mortality ratios for all-cause mortality was significantly below 100: 59 [95% confidence interval (95% CI), 54-64], predominantly due to a deficit of deaths from circulatory diseases. Within the cohort, vegetarian compared with nonvegetarian diet had no effect on overall mortality [rate ratio (RR), 1.10; 95% CI, 0.89-1.36], whereas moderate and high physical activity significantly reduced risk of death (RR, 0.62, 0.64), adjusted for age, sex, smoking, alcohol intake, body mass index, and educational level. Vegetarian diet was however associated with a reduced RR of 0.70 (95% CI, 0.41-1.18) for ischemic heart disease, which could partly be related to avoidance of meat. CONCLUSIONS: Both vegetarians and nonvegetarian health-conscious persons in this study have reduced mortality compared with the general population. Within the study, low prevalence of smoking and moderate or high level of physical activity but not strictly vegetarian diet was associated with reduced overall mortality. The nonsignificant reduction in mortality from ischemic heart diseases in vegetarians compared with health-conscious persons could be explained in part by avoidance of meat intake. 相似文献
145.
146.
Multivitamin and alcohol intake and folate receptor alpha expression in ovarian cancer. 总被引:2,自引:0,他引:2
Linda E Kelemen Thomas A Sellers Gary L Keeney Wilma L Lingle 《Cancer epidemiology, biomarkers & prevention》2005,14(9):2168-2172
Folate receptor alpha (FRalpha) expression in epithelial ovarian cancer may be related to folate intake. We examined this association using multivitamin intake, a proxy for folic acid, and assessed whether the relation was modified by alcohol intake, a folate agonist. Cases (n = 148) with suspected epithelial ovarian cancer, of ages > or = 20 years, were seen at Mayo Clinic, Minnesota, between 2000 and 2004; those with tumor specimens (n = 108) were included in analyses. Outpatient controls (n = 148) without cancer and with at least one ovary intact were matched to cases by age (within 5 years) and state of residence. Multivitamin (> or = 4 pills/wk) and weekly alcohol (> or = 5 drinks) intakes were assessed. Tumor specimens were analyzed immunohistochemically for FRalpha. Multivariable rate ratios (RR) and 95% confidence intervals (CI) were estimated using unconditional logistic regression. In case-control analysis, the RRs of multivitamin intake with absent/weak/moderate and strong-expressing FRalpha tumors were 0.30 (95% CI, 0.12-0.70) and 0.47 (95% CI, 0.24-0.91), respectively. For alcohol, the associations were 0.84 (95% CI, 0.24-2.86) and 1.65 (95% CI, 0.69-3.93), respectively. In case-case analysis, the RR associated with developing strong-expressing versus other FRalpha tumors was 3.13 (95% CI, 1.14-8.65) for multivitamins and 1.58 (95% CI, 0.45-5.60) for alcohol. The data did not support evidence for an interaction between multivitamin and alcohol intake with risk of developing a strong-expressing FRalpha tumor. The association of multivitamin intake with ovarian cancer may depend on FRalpha expression level. 相似文献
147.
148.
149.
Ronald Martin Jaime Williams Thomas Hadjistavropoulos Heather D Hadjistavropoulos Michael MacLean 《Revue canadienne de recherche en sciences infirmières》2005,37(2):142-164
The literature suggests that pain in the elderly, especially among seniors with dementia, is under-assessed and under-treated.This qualitative study solicited the perspectives of seniors, front-line nursing staff, nursing-home administrators, and informal caregivers of seniors with dementia on the current status of pain assessment and management. The views of these participants complement the research findings reported in the literature. While some of their explanations and potential solutions concerning under-treatment of pain in seniors echo views that have been presented in the literature, the participants also pointed to factors and avenues that have been given less formal consideration (e.g., systemic barriers to effective assessment and treatment of pain).They also highlighted the need for pain-control strategies beyond medication. The implications of these findings are discussed. 相似文献
150.