全文获取类型
收费全文 | 1876696篇 |
免费 | 144076篇 |
国内免费 | 3126篇 |
专业分类
耳鼻咽喉 | 25494篇 |
儿科学 | 61416篇 |
妇产科学 | 52191篇 |
基础医学 | 267048篇 |
口腔科学 | 54859篇 |
临床医学 | 161828篇 |
内科学 | 375684篇 |
皮肤病学 | 41960篇 |
神经病学 | 154062篇 |
特种医学 | 72218篇 |
外国民族医学 | 559篇 |
外科学 | 276994篇 |
综合类 | 40917篇 |
现状与发展 | 3篇 |
一般理论 | 626篇 |
预防医学 | 149088篇 |
眼科学 | 42261篇 |
药学 | 140746篇 |
3篇 | |
中国医学 | 3898篇 |
肿瘤学 | 102043篇 |
出版年
2019年 | 15683篇 |
2018年 | 24140篇 |
2017年 | 17641篇 |
2016年 | 18775篇 |
2015年 | 21631篇 |
2014年 | 27779篇 |
2013年 | 42549篇 |
2012年 | 62061篇 |
2011年 | 64519篇 |
2010年 | 36170篇 |
2009年 | 32597篇 |
2008年 | 59661篇 |
2007年 | 63117篇 |
2006年 | 62363篇 |
2005年 | 61011篇 |
2004年 | 59045篇 |
2003年 | 55841篇 |
2002年 | 54279篇 |
2001年 | 82167篇 |
2000年 | 85351篇 |
1999年 | 72253篇 |
1998年 | 18773篇 |
1997年 | 17135篇 |
1996年 | 17086篇 |
1995年 | 16733篇 |
1994年 | 15661篇 |
1992年 | 58489篇 |
1991年 | 56568篇 |
1990年 | 55192篇 |
1989年 | 53187篇 |
1988年 | 49489篇 |
1987年 | 48662篇 |
1986年 | 46286篇 |
1985年 | 44643篇 |
1984年 | 33360篇 |
1983年 | 28707篇 |
1982年 | 16773篇 |
1981年 | 14967篇 |
1979年 | 31655篇 |
1978年 | 21910篇 |
1977年 | 18530篇 |
1976年 | 17341篇 |
1975年 | 18412篇 |
1974年 | 22497篇 |
1973年 | 21709篇 |
1972年 | 19813篇 |
1971年 | 18719篇 |
1970年 | 17201篇 |
1969年 | 16190篇 |
1968年 | 14813篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
Intramedullary implants have decisive advantages in the treatment of femoral fractures in the vicinity of the hip joint: a torque that leads to a less pronounced varus position, implantation in the course of the relevant forces, and primary stability in the case of both stable and unstable fractures. Because of the constant developments in the implants available and the frequent failure to differentiate between stable and unstable fractures, some of the recommendations in the literature seem to contradict each other. However, precise analysis of the literature data show that stable fractures can be adequately treated with any technique, while unstable fractures fall in the domain of nailing systems. Since it is not possible to distinguish unequivocally between stable and unstable fractures, all trochanteric and subtrochanteric femoral fractures should be treated with a cephalomedullary nailing system. 相似文献
993.
994.
995.
Sergi Sastre Francisco Maculé Sandra Lasurt Josep-María Segur Lluis Lozano Montse Nuñez Santiago Suso 《European journal of orthopaedic surgery & traumatology : orthopedie traumatologie》2007,17(4):393-397
Five patients with idiopathic transient osteoporosis were examined. Bone scanning and MRI was helpful in the diagnosis to differentiate of necrosis and all patients recovered completely with conservative and symptomatic treatment. There was no history of trauma in all patients. MRI was realized previously in all cases to confirm the diagnosis and after the resolution of symptomathology. 相似文献
996.
E S C Korf E C W van Straaten F-E de Leeuw W M van der Flier F Barkhof L Pantoni A M Basile D Inzitari T Erkinjuntti L-O Wahlund E Rostrup R Schmidt F Fazekas P Scheltens 《Diabetic medicine》2007,24(2):166-171
HYPOTHESIS: Based on recent findings on the association between vascular risk factors and hippocampal atrophy, we hypothesized that hypertension and diabetes mellitus (DM) are associated with medial temporal lobe atrophy (MTA) in subjects without disability, independent of the severity of white matter hyperintensities. METHODS: In the Leukoaraiosis And DISability in the elderly (LADIS) study, we investigated the relationships between DM, hypertension, blood pressure and MTA in 582 subjects, stratified by white matter hyperintensity severity, using multinomial logistic regression. MTA was visually scored for the left and right medial temporal lobe (score 0-4), and meaned. RESULTS: Mean age was 73.5 years (sd 5.1), 54% was female. Of the subjects, 15% had DM, and 70% had a history of hypertension. The likelihood of having MTA score 3 was significantly higher in subjects with DM (OR 2.9; 95% CI: 1.1-7.8) compared with an MTA score of 0 (no atrophy). The odds ratio for MTA score 2 was not significantly increased (OR 1.8; CI: 0.9-4). Systolic and diastolic blood pressure and a history of hypertension were not associated with MTA. There was no interaction between DM and hypertension. Stratification on white matter hyperintensities (WMH) did not alter the associations. CONCLUSION: Our study strengthens the observation that MTA is associated with DM, independently of the amount of small vessel disease as reflected by WMH. 相似文献
997.
S Cupisti R Dittrich H Binder N Kajaia I Hoffmann T Maltaris M W Beckmann A Mueller 《Experimental and clinical endocrinology & diabetes》2007,115(6):380-386
There is growing evidence that obesity in women lead to a more severe form of hyperandrogenism and other endocrine abnormalities which may have some health implications later in life. Obese females are at higher risk for metabolic syndrome due to severe hyperandrogenemia. Calculated values for free testosterone are equivalent to those obtained by equilibrium dialysis, which is one of the reference measurement procedures (RMP) for estimation of free testosterone and may be capable of replacing values estimated using RMP's. For adult women correlations of body mass index (BMI) with calculated free (cFT) and bioavailable testosterone (cBT) are still rare, while these data are reported for peripubertal and adolescent girls. In this study we aimed to investigate the association between BMI and different androgen parameters (including calculated free and bioavailable testosterone, free androgen index, and sex hormone-binding globulin [SHBG]) in adult women with Hirsutism and with PCOS. In hirsute women with BMI > or = 25 kg/m2 measured total testosterone (TT) was significantly higher, SHBG was significantly lower and the calculated androgen parameter (FAI, cFT and cBT) were significantly higher compared to women with BMI < 25 kg/m2. In PCOS women with BMI > or = 25 kg/m2 TT was significantly higher, SHBG was significantly lower and the calculated androgen parameter (FAI, cFT and cBT) were also significantly higher compared to women with BMI < 25 kg/m2. In both the Hirsutism and PCOS-group there was a positive correlation between BMI and TT, cFT, and cBT, while BMI was negatively correlated with SHBG. In summary, in adult women with Hirsutism and PCOS obesity is associated with increased levels of TT and decreased levels of SHBG resulting in significant elevated calculated free and bioavailable testosterone levels. Obesity might lead to a more severe form of hyperandrogenism with elevated calculated free and bioavailable testosterone in the study population. 相似文献
998.
999.
David H. Wilson Catherine R. Chittleborough Kerry Kirke Janet F. Grant Richard E. Ruffin 《Sozial- und Pr?ventivmedizin》2004,13(5):406-412
Objectives: Heavy smokers are a segment of the smoking population who are at increased risk of smoking-related morbidity and least likely to achieve cessation. This study identifies the impact of heavy smoking on quality of life by gender and describes the subpopulation for improved targeting.Methods: South Australian representative population data (n = 3010) was used to compare the health-related quality of life status of male and female heavy smokers as assessed by the SF-36. 相似文献
1000.