首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4584篇
  免费   259篇
  国内免费   23篇
耳鼻咽喉   55篇
儿科学   153篇
妇产科学   49篇
基础医学   619篇
口腔科学   100篇
临床医学   331篇
内科学   1039篇
皮肤病学   217篇
神经病学   292篇
特种医学   118篇
外科学   528篇
综合类   39篇
预防医学   213篇
眼科学   186篇
药学   336篇
  2篇
中国医学   19篇
肿瘤学   570篇
  2024年   13篇
  2023年   57篇
  2022年   90篇
  2021年   147篇
  2020年   70篇
  2019年   100篇
  2018年   163篇
  2017年   117篇
  2016年   117篇
  2015年   109篇
  2014年   165篇
  2013年   175篇
  2012年   329篇
  2011年   319篇
  2010年   219篇
  2009年   174篇
  2008年   255篇
  2007年   277篇
  2006年   294篇
  2005年   248篇
  2004年   238篇
  2003年   231篇
  2002年   223篇
  2001年   64篇
  2000年   75篇
  1999年   82篇
  1998年   42篇
  1997年   39篇
  1996年   30篇
  1995年   30篇
  1994年   23篇
  1993年   14篇
  1992年   32篇
  1991年   36篇
  1990年   26篇
  1989年   36篇
  1988年   33篇
  1987年   29篇
  1986年   25篇
  1985年   29篇
  1984年   14篇
  1983年   13篇
  1982年   13篇
  1981年   4篇
  1980年   6篇
  1979年   7篇
  1974年   2篇
  1968年   6篇
  1967年   4篇
  1966年   7篇
排序方式: 共有4866条查询结果,搜索用时 15 毫秒
81.
82.
83.

Background

Visceral adipose tissue-derived serine proteinase inhibitor (vaspin) is an adipokine identified in genetically obese rats that correlates with insulin resistance and obesity in humans. Recently, we found that 7% of the Japanese population with the minor allele sequence (A) of rs77060950 exhibit higher levels of serum vaspin. We therefore evaluated the serum vaspin levels in Japanese chronic hemodialysis patients.

Methods

Healthy Japanese control volunteers (control; n?=?95, 49.9±6.91?years) and Japanese patients undergoing hemodialysis therapy (HD; n?=?138, 51.4±10.5?years) were enrolled in this study, and serum samples were subjected to the human vaspin RIA system.

Results

The measurement of the serum vaspin levels demonstrated that a fraction of control subjects (n?=?5) and HD patients (n?=?11) exhibited much higher levels (> 10?ng/ml; VaspinHigh group), while the rest of the population exhibited lower levels (< 3?ng/ml; VaspinLow group). By comparing the patients in the VaspinLow group, the serum vaspin levels were found to be significantly higher in the control subjects (0.87±0.24?ng/ml) than in the HD patients (0.32±0.15?ng/ml) (p?<?0.0001). In the stepwise regression analyses, the serum creatinine and triglyceride levels were found to be independently and significantly associated with the vaspin concentrations in all subjects.

Conclusions

The creatinine levels are negatively correlated with the serum vaspin levels and were significantly reduced in the Japanese HD patients in the VaspinLow group.
  相似文献   
84.

Background

Emergency surgery itself induces high risk for postoperative mortality and morbidities; however, it remains unknown which concomitant pathological conditions of emergency surgeries are causative factors of deteriorating outcomes. This study examined the causal factors of postoperative mortality and morbidity in cases of emergency surgery.

Methods

Patients undergoing emergency surgery from January to December 2007 were enrolled in this retrospective cohort study. Causal relationships were analyzed by stepwise multivariate logistic regression analysis between possible independent factors (sex, age, kind of surgical department, timing of surgery, duration of surgery, blood transfusion, deteriorated consciousness level, shock state, abnormal coagulate state, and history of hypertension, diabetes, ischemic heart disease, chronic obstructive pulmonary disease, renal failure, and anemia) and postoperative mortality or morbidities (failure of removal of tracheal tube after operation, tracheotomy, cerebral infarction, massive hemorrhage, severe hypotension, severe hypoxemia, and severe arrhythmia during or after surgery).

Results

Shock, deteriorated consciousness level, chronic obstructive lung disease, and ischemic heart disease were significant risk factors for mortality (OR 14.2, 7.9, 6.4, and 3.8, respectively), and deteriorated consciousness level, blood transfusion, shock, chronic obstructive lung disease, diabetes, cardiovascular surgery, and operation longer than 2 h were significant risk factors for morbidity (OR 19.1, 3.3, 3.0, 2.5, 2.4, 2.4, and 1.8, respectively).

Conclusion

State of shock, deteriorated consciousness level, chronic obstructive lung disease, ischemic heart disease, hemorrhage requiring blood transfusion, age over 80 years, cardiovascular surgery, surgeries at night, and surgeries of duration more than 2 h cause patients to be strongly susceptible to postoperative mortality or morbidity in emergency surgeries.  相似文献   
85.
This was a case–control study to analyze the associations between calcium urolithiasis and the urokinase polymorphisms, P141L (rs2227564) and 3′-UTR C>T (rs4065), in a Japanese population. Cases consisted of 232 patients with urinary calcium stones (174 men and 58 women) who presented to a general hospital between April 2009 and June 2011. Among these cases, 115 (49.6 %) patients had calcium oxalate stones alone, and 113 (48.7 %) patients had calcium oxalate stones mixed with calcium phosphate stones. Controls consisted of 454 subjects who had a routine health check-up in the same prefecture. The two polymorphisms were genotyped via polymerase chain reaction with confronting two-pair primers. In the control group, the genotype frequencies of P141L were 0.573 for PP, 0.375 for PL, and 0.052 for LL, and those of 3′-UTR C>T were 0.835 for CC, 0.165 for CT, and TT was not identified. Neither of the polymorphisms was significantly associated with urolithiasis. The age- and sex-adjusted odds ratios of urolithiasis were 0.96 [95 % confidence interval (CI), 0.66–1.41] for PL and 1.22 (0.58–2.57) for LL as compared with PP genotype of P141L, and 1.01 (0.62–1.64) for CT as compared with CC genotype of 3′-UTR C>T. When compared with the PP genotype of P141L, the frequency of PL was significantly lower in female cases with a family history of urolithiasis than in females without such family history (p = 0.028). P141L and 3′-UTR polymorphisms of the urokinase gene are not associated with urolithiasis in a Japanese population.  相似文献   
86.
87.
We report a rare case of visual improvement in a 19-year-old patient with Apert syndrome after segmental distraction with a rigid external distraction device. We used the Rigid External Distraction Device II System (R.E.D. II, KLS Martin) after Le Fort I and III osteotomies.  相似文献   
88.
Abstract Objectives: To propose a method for evaluating the reproducibility of anatomical coordinate systems based on craniofacial skeletal landmarks and to tentatively evaluate four systems created on preoperative cone-beam computed tomography (CBCT) data obtained from mandibular prognathism patients in order to confirm the utility for actual patients' data. Materials and Methods: In three-dimensional images of 10 patients obtained by a CBCT with a large field of view, six dentists set four coordinate systems that were created in different ways, twice by plotting some landmarks situated in the superior portion of the maxillofacial skeletons. The 95% confidence ellipse of six objective landmarks related to the jaw and teeth (upper incisor, left upper first molar, lower incisor, left lower first molar, menton, and left gonion) were three-dimensionally drawn for each coordinate system. The ellipsoid volume was calculated to evaluate the reproducibility of the coordinate systems. Results: The reproducibility could be evaluated for each coordinate system using the method proposed. The coordinate systems that were created by landmarks situated at greater distances from each other showed relatively small ellipsoid volume in comparison to those with shorter distances between landmarks. Conclusion: Anatomical coordinate systems with larger distances between the landmarks used were stable when landmarks related to the jaw and teeth were assigned as objective landmarks. The method proposed here was effective in terms of the reproducibility evaluation of a coordinate system.  相似文献   
89.
90.
Infliximab, a tumor necrosis factor-alpha antagonist, is used to treat many inflammatory diseases. Various forms of demyelinating neuropathies have been reported as neurological complications associated with infliximab use. There have been few reports of pure sensory neuropathy associated with infliximab. We report the clinical, electrophysiological, and pathological findings of a patient with subacute sensory polyradiculopathy 1 month after infliximab therapy for psoriasis vulgaris. Immune-mediated pathogenesis was suggested by positive anti-ganglioside antibodies and rapid response to intravenous immunoglobulin. This is the first reported case of sensory polyradiculopathy with positive anti-ganglioside antibodies following infliximab therapy. Our findings suggest the clinical importance of immunological investigations and treatment in demyelinating neuropathies following infliximab therapy.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号