全文获取类型
收费全文 | 9590篇 |
免费 | 561篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 52篇 |
儿科学 | 204篇 |
妇产科学 | 106篇 |
基础医学 | 996篇 |
口腔科学 | 146篇 |
临床医学 | 1065篇 |
内科学 | 2373篇 |
皮肤病学 | 165篇 |
神经病学 | 465篇 |
特种医学 | 257篇 |
外国民族医学 | 1篇 |
外科学 | 1819篇 |
综合类 | 235篇 |
现状与发展 | 1篇 |
一般理论 | 6篇 |
预防医学 | 593篇 |
眼科学 | 241篇 |
药学 | 839篇 |
中国医学 | 164篇 |
肿瘤学 | 492篇 |
出版年
2024年 | 19篇 |
2023年 | 177篇 |
2022年 | 553篇 |
2021年 | 712篇 |
2020年 | 411篇 |
2019年 | 513篇 |
2018年 | 501篇 |
2017年 | 310篇 |
2016年 | 342篇 |
2015年 | 376篇 |
2014年 | 456篇 |
2013年 | 540篇 |
2012年 | 802篇 |
2011年 | 745篇 |
2010年 | 363篇 |
2009年 | 338篇 |
2008年 | 516篇 |
2007年 | 487篇 |
2006年 | 421篇 |
2005年 | 392篇 |
2004年 | 329篇 |
2003年 | 279篇 |
2002年 | 160篇 |
2001年 | 69篇 |
2000年 | 57篇 |
1999年 | 52篇 |
1998年 | 28篇 |
1997年 | 17篇 |
1996年 | 19篇 |
1995年 | 15篇 |
1994年 | 11篇 |
1993年 | 14篇 |
1992年 | 19篇 |
1991年 | 14篇 |
1990年 | 12篇 |
1989年 | 11篇 |
1988年 | 7篇 |
1987年 | 15篇 |
1986年 | 15篇 |
1985年 | 7篇 |
1984年 | 13篇 |
1983年 | 4篇 |
1982年 | 10篇 |
1981年 | 13篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1977年 | 5篇 |
1976年 | 5篇 |
1970年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Moazam Javed Muhammad Tarique Tunio Hafiz Abdul Rauf Muhammad Fahad Bhutta Sadia Naz Sajid Iqbal 《Andrologia》2019,51(8)
The aim of the present study was to determine the protective effects of pomegranate juice in tris‐based extender on semen parameters, computer‐assisted sperm analysis (CASA) motion characteristics and field fertility of post‐thawed Nili Ravi buffalo (Bubalus bubalis) bull spermatozoa. Two consecutive ejaculates/collection from each of the five adult Nili Ravi buffalo bulls were collected with artificial vagina at 42°C for a period of 7 weeks, diluted in extender containing different concentrations of pomegranate juice (0.0%, 2.5%, 5%, 7.5% and 10%). Diluted samples were packed and frozen in 0.54 ml French straws. The addition of 10% pomegranate juice in extender significantly improved post‐thaw sperm morphology (%), motilities (CASA total motility, progressive motility (%) as well as VAP, VSL, VCL, STR, DAP, DSL) compared to the control group (p < 0.05). Plasma membrane, acrosome membrane and DNA integrity were significantly higher in extender with 10% pomegranate juice than the control group (p < 0.05). Field fertility rate (60.39% vs. 46.53%) was higher (p < 0.05) in extender with 10% pomegranate juice as compared to the control. It is therefore concluded that the addition of 10% pomegranate juice in tris‐based extender improves post‐thaw semen parameters, CASA motion dynamics and field fertility in Nili Ravi buffaloes. 相似文献
992.
Identification of novel CYP1B1 gene mutations in patients with primary congenital and primary open‐angle glaucoma 下载免费PDF全文
993.
994.
Aslam TM Dhillon B Tallentire VR Patton N Aspinal P 《Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift für Augenheilkunde》2004,218(6):402-410
AIM: To design, develop and test a system for analysis of photic phenomena. METHOD: Extensive background research, patient interviews and theoretical studies led to development of a set of photographic images resembling photic phenomena experienced by patients. These photographic images were processed and digitally altered to create scales of severity for each photic phenomenon in which patients indicated their severity of symptoms by choice of image. The system was tested for stability and validity. RESULTS: The system showed excellent repeatability and reliability. Face, content, criterion and construct validity were all found to be acceptable. CONCLUSION: The photographic images of photic phenomena analyser is an acceptable, validated measure for the assessment of photic phenomena, in both pseudophakic patients and those with cataract. 相似文献
995.
996.
997.
Benjamin R. Griffin J. Pedro Teixeira Sophia Ambruso Michael Bronsert Jay D. Pal Joseph C. Cleveland T. Brett Reece David A. Fullerton Sarah Faubel Muhammad Aftab 《The Journal of thoracic and cardiovascular surgery》2021,161(4):1346-1355.e3
ObjectivesSevere acute kidney injury (AKI) is a known risk factor for infection and mortality. However, whether stage 1 AKI is a risk factor for infection has not been evaluated in adults. We hypothesized that stage 1 AKI following cardiac surgery would independently associate with infection and mortality.MethodsIn this retrospective propensity score–matched study, we evaluated 1620 adult patients who underwent nonemergent cardiac surgery at the University of Colorado Hospital from 2011 to 2017. Patients who developed stage 1 AKI by Kidney Disease Improving Global Outcomes creatinine criteria within 72 hours of surgery were matched to patients who did not develop AKI. The primary outcome was an infection, defined as a new surgical-site infection, positive blood or urine culture, or development of pneumonia. Secondary outcomes included in-hospital mortality, stroke, and intensive care unit (ICU) and hospital length of stay (LOS).ResultsStage 1 AKI occurred in 293 patients (18.3%). Infection occurred in 20.9% of patients with stage 1 AKI compared with 8.1% in the no-AKI group (P < .001). In propensity-score matched analysis, stage 1 AKI independently associated with increased infection (odds ratio [OR]; 2.24, 95% confidence interval [CI], 1.37-3.17), ICU LOS (OR, 2.38; 95% CI, 1.71–3.31), and hospital LOS (OR, 1.30; 95% CI, 1.17-1.45).ConclusionsStage 1 AKI is independently associated with postoperative infection, ICU LOS, and hospital LOS. Treatment strategies focused on prevention, early recognition, and optimal medical management of AKI may decrease significant postoperative morbidity. 相似文献
998.
Muhammad Amjad Awan Javeria Arshad Bushra Allah Rakha Muhammad Sajjad Ansari Muhammad Waseem Ali Fouladi-Nashta David Miller Shamim Akhter 《Andrologia》2021,53(3):e13991
This study reports the first evaluation of sperm hyaluronan binding assay (HBA) for predicting the fertility of Nili-Ravi buffalo bulls in relation to standard parameters of sperm quality. Cryopreserved semen doses of low (n = 6), medium (n = 3) and high fertility (n = 8) bulls based on their respective return rates were used. Significantly, more spermatozoa bound to hyaluronan from the most fertile bulls (57.15% ± 1.44) compared with medium (42.46% ± 1.08) and low fertility bulls (29.70% ± 0.78). A strongly positive correlation (r = .824, p < .01) was found between HBA and fertility that predicts a 67.9% variability (r2 = .679, p < .01) in fertility. HBA was also strongly positively correlated with sperm viability (r = .679, p < .01) followed by their live/dead ratio (r = .637, p < .01), uncapacitated spermatozoa (r = .631, p < .01), normal apical ridge (r = .459, p < .01), motility (r = .434, p < .01), mature spermatozoa with low residual histones (r = .364, p < .01), high plasma membrane integrity (r = .316, p < .01) and nonfragmented DNA levels (r = .236, p < .05). It was negatively correlated with spermatozoa having reacted acrosome (r = −.654, p < .01). A fertility model built using a combination of sperm HBA and either sperm livability or viability predicts, respectively, 86.1% (r2 = .861, p < .01) and 85.9% (r2 = .859, p < .01) variability in buffalo bull fertility. In conclusion, sperm HBA may prove to be a single robust predictor of Nili-Ravi buffalo bull fertility. 相似文献
999.
Satti L Abbasi S Sattar A Ikram A Manzar MA Khalid MM 《Journal of the College of Physicians and Surgeons--Pakistan : JCPSP》2011,21(8):500-502
Incidence and prevalence of Mycobacterium fortuitum infection vary greatly by location and death is very rare except in disseminated disease in immunocompromised individuals. We present what we believe is the first case of bone marrow infection with Mycobacterium fortuitum in an HIV negative patient. Bone marrow examination revealed presence of numerous acid fast bacilli which were confirmed as Mycobacterium fortuitum on culture and by molecular analysis. Patient was managed successfully with amikacin and ciprofloxacin. 相似文献
1000.
PURPOSE: To review the pathobiology and clinical implications of coronary vulnerable atherosclerotic plaques (VAPs), to discuss the role of statin therapy in VAP stabilization, and the potential benefits of perioperative statin therapy (PST) in reducing perioperative risk of acute coronary syndromes (ACSs). SOURCE: MEDLINE search using "perioperative", "cardiac morbidity", "atherosclerosis", "vulnerable plaque", "statins" and combinations of these terms as keywords. The reference lists of relevant articles were further reviewed to identify additional citations. PRINCIPAL FINDINGS: The nonstenotic, yet rupture-prone VAP causes most myocardial infarctions (MIs) and other ACSs, both in the nonsurgical and surgical patients. Large clinical trials in both primary and secondary prevention and in patients with ACSs have demonstrated that statin therapy will reduce cardiovascular morbidity and mortality across a broad spectrum of patient subgroups. These trials also suggest, and laboratory investigations establish, that statins possess favourable vascular effects independent of cholesterol reduction. Statins appear to interfere specifically with the pathophysiologic mechanisms implicated in atherothrombotic disease. Statins reduce vascular inflammation, improve endothelial function, stabilize VAPs, and reduce platelet aggregability and thrombus formation. Recent studies have shown that PST is associated with a reduced incidence of perioperative and long-term cardiovascular complications in high-risk patients. Combined therapy with statins and ss-blockers is a conceptually valid strategy targeting critical steps in the pathogenesis of an ACS. CONCLUSION: Emerging evidence for the efficacy and safety of PST is promising, especially when combined with ss-blocker therapy in patients at highest risk. Confirmation of this early evidence awaits the results of ongoing and future prospective randomized controlled trials. 相似文献