全文获取类型
收费全文 | 6432篇 |
免费 | 289篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 130篇 |
儿科学 | 620篇 |
妇产科学 | 97篇 |
基础医学 | 716篇 |
口腔科学 | 149篇 |
临床医学 | 459篇 |
内科学 | 1113篇 |
皮肤病学 | 104篇 |
神经病学 | 342篇 |
特种医学 | 182篇 |
外科学 | 894篇 |
综合类 | 147篇 |
一般理论 | 2篇 |
预防医学 | 475篇 |
眼科学 | 253篇 |
药学 | 536篇 |
中国医学 | 33篇 |
肿瘤学 | 494篇 |
出版年
2022年 | 106篇 |
2021年 | 184篇 |
2020年 | 120篇 |
2019年 | 155篇 |
2018年 | 135篇 |
2017年 | 106篇 |
2016年 | 171篇 |
2015年 | 150篇 |
2014年 | 258篇 |
2013年 | 295篇 |
2012年 | 421篇 |
2011年 | 416篇 |
2010年 | 292篇 |
2009年 | 191篇 |
2008年 | 314篇 |
2007年 | 329篇 |
2006年 | 341篇 |
2005年 | 309篇 |
2004年 | 239篇 |
2003年 | 234篇 |
2002年 | 179篇 |
2001年 | 90篇 |
2000年 | 68篇 |
1999年 | 76篇 |
1998年 | 51篇 |
1997年 | 33篇 |
1996年 | 39篇 |
1992年 | 61篇 |
1991年 | 63篇 |
1990年 | 43篇 |
1989年 | 70篇 |
1988年 | 46篇 |
1987年 | 56篇 |
1986年 | 62篇 |
1985年 | 49篇 |
1984年 | 40篇 |
1982年 | 36篇 |
1981年 | 39篇 |
1980年 | 40篇 |
1979年 | 55篇 |
1978年 | 37篇 |
1977年 | 36篇 |
1976年 | 41篇 |
1975年 | 51篇 |
1974年 | 61篇 |
1973年 | 42篇 |
1971年 | 46篇 |
1970年 | 47篇 |
1968年 | 32篇 |
1967年 | 35篇 |
排序方式: 共有6746条查询结果,搜索用时 10 毫秒
71.
Intezar Ahmed Anshuman Sharma Archika Gupta Naveen Chandra Jiledar Rawat Sarita Singh 《Indian journal of gastroenterology》2011,30(2):94-96
One of the rare complications of choledochal cysts is rupture. In majority of the cases, the cause of rupture is unknown.
Reconstructive surgery is the treatment of choice. We describe three patients with choledochal cyst rupture, who were admitted
with acute abdomen. Diagnosis of biliary ascites with peritonitis was made in all the three patients. At surgery, two patients
underwent T-tube placement, and definitive repair was done electively. One patient underwent definitive repair of ruptured
choledochal cyst, but died due to septicemia. External bile drainage would be safer in emergency condition. 相似文献
72.
73.
New therapeutic approach for impaired arteriogenesis in diabetic mouse hindlimb ischemia. 总被引:1,自引:0,他引:1
Shyamal Chandra Bir Masatoshi Fujita Akira Marui Keiichi Hirose Yoshio Arai Hisashi Sakaguchi Yuhong Huang Jiro Esaki Tadashi Ikeda Yasuhiko Tabata Masashi Komeda 《Circulation journal》2008,72(4):633-640
BACKGROUND: The combined treatment of sustained-release basic fibroblast growth factor (Sr-bFGF) and a 5-hydroxytryptamine(2A) blocker, sarpogrelate, was evaluated to see whether it reversed the impaired collateral circulation in diabetic (DM) mouse hindlimb ischemia. METHOD AND RESULTS: Diabetic and normal mice with ischemic hindlimb were randomly assigned to 1 of 5 experimental groups (no treatment, sarpogrelate 50 mg . kg(-1) . day(-1), 20 microg or 50 microg Sr-bFGF and a combined treatment of 20 microg Sr-bFGF and sarpogrelate), and treated for 4 weeks. Tissue blood perfusion (TBP), vascular density (angiogenesis) and the number of mature vessels (arteriogenesis) were checked by the use of standard methods. Although angiogenesis was comparable (161+/-14 vs 154+/-12 vessels/mm(2)), the laser Doppler perfusion image index (LDPII) (0.43+/-0.11 (SD) vs 0.63+/-0.08, p<0.05) and arteriogenesis (8+/-3 vs 12+/-4 vessels/mm(2), p<0.05) were significantly lower in DM mice than those in normal mice. The dose of Sr-bFGF for the sufficient number of mature vessels (>or=45 vessels/mm(2)) and LDPII (>or=0.9) was 20 microg for the normal mice, and 50 microg for the DM mice, which was reduced with the aid of sarpogrelate. Conclusions A combined therapy of Sr-bFGF and sarpogrelate is effective for neovascularization to reverse the impaired arteriogenesis and TBP in DM mice. 相似文献
74.
75.
Background and aims
Pulmonary embolism (PE) is associated with a significant mortality and morbidity. We aim to study clinical profile, management and outcome of PE at Shahid Gangalal National heart Centre, Kathmandu, Nepal.Methods
It was a retrprospective, single centre study, conducted from January 2015 to December 2016. Haemodynamics was used for risk Simplified, PESI score, predisposing factors, symptoms, clinical features at the time of admission, ECG features, echocardiogram, treatment received and the outcome were reviewed.Results
During the study period 23 cases of PE were admitted. Nine were males and 14 were females. Eleven patients were diagnosed as provoked PE. High risk PE was diagnosed in four patients, Non-high risk in 19 patients. The most common clinical presentation was shortness of breath. The most common finding in ECG is sinus tachycardia followed by ST-T changes in V1-V3. Eight patient had SPO2 less than 90%. Most of the patients had a normal chest radiograph. Echocardiography revealed dilated RA and RV in 20 patients.All high risk PE patients were thrombolyzed with streptokinase. All patients who were diagnosed as Non-high risk PE were treated with LMWH. All the patients were treated with oral anticoagulants. Mean hospital stay was 9.7 ± 4.9 days. Two patients died during hospital stay. S-PESI score was 1.4 ± 0.9 respectively. Mean warfarin dose at the time of discharge was 5.9 ± 1.6 mg.Conclusion
PE is an under diagnosed clinical problem world over. Suspicion is the most important part to come to the diagnosis of PE. 相似文献76.
Expression of cardiac myocyte Kv4 channels (Kv4.3 for human, Kv4.2 and Kv4.3 for rodents) is downregulated with hypertrophy in vivo leading to a decrease in the transient outward current (Ito). This effect is recapitulated in vitro with rat neonatal cardiac myocytes treated with angiotensin II (Ang II), which acts via AT1 receptors, NADPH oxidase and p38 MAP kinase to destabilize the 3′ untranslated region (3′UTR) of the Kv4.3 channel messenger RNA (mRNA). Here deletion analysis and mutagenesis identify an AU-rich element (ARE) in the Kv4.3 3′UTR that is required for Ang II-induced destabilization. Overexpression of AUF1 (ARE/poly-(U)-binding/degradation factor 1), an RNA destabilizing protein, mimics and occludes the Ang II effect, while RNA interference targeted against AUF1 blocks the Ang II effect on the Kv4.3 3′UTR. Ang II upregulates AUF1 by activating AT1 receptors, NADPH oxidase and p38 MAP kinase. Finally, pull-down assays establish that Ang II increases AUF1 binding to the ARE required for destabilization, while binding of the mRNA stabilizing protein HuR is unaffected. Hence, Ang II acts via AT1 receptors, NADPH oxidase and p38 MAP kinase to upregulate AUF1, which in turn binds to an ARE in the Kv4.3 3′UTR to destabilize the channel mRNA. 相似文献
77.
Chlamydia pneumoniae exposure and inflammatory markers in acute coronary syndrome (CIMACS) 总被引:7,自引:0,他引:7
Chandra HR Choudhary N O'Neill C Boura J Timmis GC O'Neill WW 《The American journal of cardiology》2001,88(3):214-218
Previous studies have shown higher levels of Chlamydia pneumoniae (C. pneumoniae, CP) antibody titers (CPIgG), C-reactive protein (CRP), and fibrinogen in patients with coronary artery disease. The role of these infectious and inflammatory markers in precipitating acute coronary syndrome (ACS) is unclear. We conducted a cross-sectional study on patients (n = 830, mean age 63 +/- 15 years, 57% male) admitted to the chest pain center of our institution. The differences in the CPIgG, CRP, and fibrinogen levels in patients who were diagnosed with ACS versus those who were not (non-ACS) were evaluated. CPIgG titers tended to be higher in the ACS group than in the non-ACS group. However, when different titers were used to define seropositivity, the difference achieved statistical significance only at the titer of > or =1:1,024 (35% vs 26%, p = 0.004). CRP (median 0.48 vs 0.33 mg/dl, p <0.0001), fibrinogen (median 317 vs 293 mg/dl, p <0.0001), and leukocyte count (median 7.7 vs 6.9 10(9)/L, p <0.0001) were higher in the ACS group. On multivariate analysis, CPIgG > or =1:1,024 (odds ratio [OR] 1.62), diabetes (OR 1.91), hypertension (OR 1.46), prior myocardial infarction (OR 1.78), smoking (OR 1.70), Caucasian race (OR 1.7), high-density lipoprotein (OR 0.98), and elevated troponin-T (OR 12.44) were the only factors independently associated with ACS. Thus, we found a strong association between high level seropositivity to CP and ACS. This may indicate recent re-infection or an exaggerated immune response to CP as an etiologic factor for ACS. This study also suggests that therapeutic interventions may need to be specifically targeted to these patients. 相似文献
78.
Density and function of inward currents in right atrial cells from chronically fibrillating canine atria 总被引:7,自引:0,他引:7
Yagi T Pu J Chandra P Hara M Danilo P Rosen MR Boyden PA 《Cardiovascular research》2002,54(2):405-415
OBJECTIVE: To determine whether I(Na) and I(CaL) are altered in function/density in right atrial (RA) cells from dogs with chronic atrial fibrillation (cAF dogs, episodes lasting at least 6 days) and whether the changes that occur differ from those in dogs with nonsustained or brief episodes of fibrillation (nAF dogs). METHODS: Using whole cell voltage clamp, sodium and calcium current density and function were determined in disaggregated RA cells from nAF, cAF and control atria (Con). Ca(2+) currents were studied with either Ca(2+) or Ba(2+) as charge carrier, as well as with either EGTA or BAPTA as the internal solution Ca(2+) chelator. RESULTS: After rapid atrial pacing, dogs can either fibrillate for short periods of time (nAF) or longer, more sustained periods (cAF). Both the Na(+) and Ca(2+) current decrease in cells of the nAF atria. Na(+) current density remains reduced in cAF cells with some slowing of recovery kinetics. Ca(2+) current density does not further decrease with persistent atrial fibrillation (cAF cells) remaining significantly different from Con cells. However, the difference in density of Ca(2+) currents between nAF and Con cells is negligible when Ba(2+) is charge carrier and when Ca(i) is quickly and effectively chelated with BAPTA. On the contrary, cAF I(BaL) densities remain significantly reduced compared to Con and nAF values when Ba(2+)/BAPTA conditions are used. CONCLUSIONS: Na(+) current density/function does not recover to Con values in cAF. Further these enhanced Ca(2+)-dependent inactivation processes contribute significantly to the reduction of I(CaL) density observed in nAF cells while reduction of Ca(2+) currents in cAF atria is probably by another mechanism 相似文献
79.
80.