全文获取类型
收费全文 | 916965篇 |
免费 | 63314篇 |
国内免费 | 2434篇 |
专业分类
耳鼻咽喉 | 12656篇 |
儿科学 | 28918篇 |
妇产科学 | 26392篇 |
基础医学 | 128905篇 |
口腔科学 | 25081篇 |
临床医学 | 76336篇 |
内科学 | 186556篇 |
皮肤病学 | 19462篇 |
神经病学 | 73358篇 |
特种医学 | 37559篇 |
外国民族医学 | 336篇 |
外科学 | 145333篇 |
综合类 | 19125篇 |
一般理论 | 252篇 |
预防医学 | 65133篇 |
眼科学 | 20281篇 |
药学 | 64893篇 |
中国医学 | 1810篇 |
肿瘤学 | 50327篇 |
出版年
2018年 | 9514篇 |
2017年 | 7558篇 |
2016年 | 8150篇 |
2015年 | 9310篇 |
2014年 | 13093篇 |
2013年 | 20013篇 |
2012年 | 26988篇 |
2011年 | 28709篇 |
2010年 | 17460篇 |
2009年 | 16597篇 |
2008年 | 27345篇 |
2007年 | 28962篇 |
2006年 | 29075篇 |
2005年 | 28543篇 |
2004年 | 27282篇 |
2003年 | 26361篇 |
2002年 | 25893篇 |
2001年 | 41526篇 |
2000年 | 42687篇 |
1999年 | 36432篇 |
1998年 | 10111篇 |
1997年 | 9295篇 |
1996年 | 9162篇 |
1995年 | 8525篇 |
1994年 | 8143篇 |
1993年 | 7626篇 |
1992年 | 28247篇 |
1991年 | 27017篇 |
1990年 | 26445篇 |
1989年 | 25380篇 |
1988年 | 23579篇 |
1987年 | 23190篇 |
1986年 | 22271篇 |
1985年 | 21164篇 |
1984年 | 15821篇 |
1983年 | 13487篇 |
1982年 | 8097篇 |
1979年 | 14594篇 |
1978年 | 10215篇 |
1977年 | 8630篇 |
1976年 | 8149篇 |
1975年 | 8965篇 |
1974年 | 10702篇 |
1973年 | 10187篇 |
1972年 | 9665篇 |
1971年 | 8921篇 |
1970年 | 8588篇 |
1969年 | 8028篇 |
1968年 | 7687篇 |
1967年 | 7088篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Tarek A. Amer Tarek F. Elwakil Mahmoud S. Elbasiouny 《European journal of plastic surgery》2007,30(2):67-73
Haemangiomas are the most common tumours of infancy. They typically proliferate then involute with considerable variation
as regards to their rates of proliferation and involution. Haemangioma of the nasal tip is a lesion of special characteristics.
During proliferation, it expands, contracts and deviates the nasal cartilages. Particularly, it regresses slowly and frequently
involutes incompletely. That is why excision of the lesion is frequently suggested. The present study was conducted to evaluate
open rhinoplasty after initial non-excision treatment modalities namely, intra-lesional corticosteroid injections and laser
treatment, as a protocol of treatment for nasal tip haemangiomas. Twelve patients with nasal tip haemangiomas were included
in the present study. Patients of both sexes, of different ages, with deep and mixed haemangiomas were studied. Disfigurement
was the constant presenting symptom. Initial non-excision treatment reported different responses as denoted by the regression
of the lesions’ size. Haemangiomas constantly extended between the medial crura of the alar cartilages as noted by the constant
widening of the columella pre-operatively and the obvious separation of the nasal cartilages intra-operatively. This separation
was constantly found to require approximation by sutures. The results of the present study concluded that whenever an early
presentation with nasal tip haemangioma could be established, initial non-excision treatment followed by open rhinoplasty
could be a useful protocol of treatment. Within the limitations of the present study, this protocol could achieve an early,
safe and effective treatment for nasal tip haemangiomas with provisionally acceptable cosmetic outcomes so far. 相似文献
992.
993.
To evaluate the long-term effects of entacapone on both mean daily 'on' time and health-related quality of life (QoL) in patients with Parkinson's disease (PD) experiencing 'end-of-dose' motor fluctuations and the benefits of an early therapeutic intervention. A prospective, multicenter, observational, 12-month study was performed with an initial 3-month intervention phase, consisting of a phone call to half of the patients from randomly selected investigators to assess if dose adjustment was necessary. Effectiveness was determined by home diaries ('on' time), subscales II and III of the Unified Parkinson's Disease Rating Scale (UPDRS), and the Parkinson's Disease Questionnaire (PDQ-8). After 3 months of treatment, 4.0% of the intervention group patients discontinued the study, versus 18.4% in the control group ( P < 0.01). The improvement in 'on' time was significantly increased since the 3-month visit (21%, P < 0.0001) until the end of the study (23% at 12 months, P < 0.0001). Entacapone also induced significant reductions in the UPDRS scores for subscales II and III and in the PDQ-8 score. 11.2% of patients experienced at least one adverse reaction. This study confirms the effectiveness of entacapone in reducing motor fluctuations by increasing 'on' time, and in improving QoL of PD patients. An early adjustment of entacapone and levodopa doses reduces the number of treatment discontinuations during the first months of treatment. 相似文献
994.
995.
996.
Edwin H. Preston He Xu Kiran K. Dhanireddy Jonathan P. Pearl Frank V. Leopardi Matthew F. Starost Douglas A. Hale Allan D. Kirk 《American journal of transplantation》2005,5(5):1032-1041
CD154-specific antibody therapy prevents allograft rejection in many experimental transplant models. However, initial clinical transplant trials with anti-CD154 have been disappointing suggesting the need for as of yet undetermined adjuvant therapy. In rodents, donor antigen (e.g., a donor blood transfusion), or mTOR inhibition (e.g., sirolimus), enhances anti-CD154's efficacy. We performed renal transplants in major histocompatibility complex-(MHC) mismatched rhesus monkeys and treated recipients with combinations of the CD154-specific antibody IDEC-131, and/or sirolimus, and/or a pre-transplant donor-specific transfusion (DST). Therapy was withdrawn after 3 months. Triple therapy prevented rejection during therapy in all animals and led to operational tolerance in three of five animals including donor-specific skin graft acceptance in the two animals tested. IDEC-131, sirolimus and DST are highly effective in preventing renal allograft rejection in primates. This apparently clinically applicable regimen is promising for human renal transplant trials. 相似文献
997.
What factors influence survival in patients with unresected synchronous liver metastases after resection of colorectal cancer? 总被引:3,自引:0,他引:3
N. Chafai C. L. H. Chan E. L. Bokey O. F. Dent G. Sinclair P. H. Chapuis 《Colorectal disease》2005,7(2):176-181
OBJECTIVE: The aim of this study was to determine whether the survival of patients with untreated synchronous liver metastases after resection of a colorectal cancer was associated with any features of the primary tumour. METHODS: Information for 398 consecutive patients with unresected liver metastases in the period 1971-2001 was examined by multivariate survival analysis. RESULTS: Of 19 clinical and pathological variables considered, survival was independently associated only with residual tumour in a line of resection (hazard ratio (HR) 1.95), venous invasion (HR 1.87), right colonic tumour (HR 1.68), lymph node metastasis (HR 1.54), and extra-hepatic metastasis (HR 1.16); 8.3% of patients had none of these adverse features. Their 2-year overall survival rate was 39.2%, compared with only 16.5% (P < 0.001) in those with one or more adverse features. CONCLUSIONS: These findings may assist in selecting patients most likely to benefit from treatment of hepatic metastases and in counselling patients and their relatives. 相似文献
998.
Dr. S. Besier T.M. Bingold F. Walcher K. Engels B. Spellerberg V. Brade C. Brandt 《Der Chirurg》2007,78(12):1148-1151
Streptococcus agalactiae, known as a pathogen that causes meningitis and septicemia in neonates, emerges as an invasive organism in nonpregnant adults. This case report describes the fulminant course of a necrotizing fasciitis (NF) with streptococcal toxic shock-like syndrome (STSS) in a 76-year-old diabetic patient caused by S. agalactiae, serotype V. Chronic diseases and immunodeficiency are considered to be risk factors for the acquisition of group B streptococcal disease. Since early surgical treatment in conjunction with antimicrobial and intensive care therapy is critical for the outcome of patients with NF and/or STSS, clinicians should be aware of invasive S. agalactiae infections in adults with subcutaneous emphysema. 相似文献
999.
Holger F. Boehm Felix Eckstein Caecilia Wunderer Volker Kuhn Eva-Maria Lochmueller Karin Schreiber Dirk Mueller Ernst J. Rummeny Thomas M. Link 《Journal of clinical densitometry》2005,8(4):488-494
We tested the hypothesis that bone mineral density (BMD) and bone mineral content (BMC) in proximal human femur specimens in the upper neck region of interest (ROI) and femoral neck axis length (FNAL) provide a significantly better prediction of femoral bone strength than standard ROIs in vitro. BMD and BMC were measured in 110 proximal femur specimens using a standard dual-energy X-ray absorptiometry (DXA) scanner. The analysis included a new ROI in the upper neck as well as the standard ROIs. FNAL was obtained from the scan images. The specimens' failure-load was measured in a mechanical loading device, simulating a fall on the greater trochanter. For the standard ROIs, correlations between failure-load and BMD ranged from R2 = 0.64 (shaft ROI) to R2 = 0.70, p < 0.001 (femoral neck). Prediction of strength by BMD did not significantly differ from those of BMC (R2 ranging from 0.65 to 0.75, p < 0.001). In the upper neck ROI, for both BMD and BMC correlations with failure-load were higher (R2 = 0.76 and 0.81, respectively; p < 0.001). A lower, yet still significant, correlation was found between FNAL and bone strength (R2 = 0.23, p < 0.001). Normalization of failure-load with respect to FNAL did not significantly increase the correlations with densitometric measures. This study provides in vitro evidence indicating that among the ROIs of the proximal femur the newly defined upper neck ROI provides the best prediction of bone strength. Only a weak association was observed between failure load and FNAL. 相似文献
1000.