全文获取类型
收费全文 | 4298篇 |
免费 | 218篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 91篇 |
妇产科学 | 110篇 |
基础医学 | 402篇 |
口腔科学 | 103篇 |
临床医学 | 350篇 |
内科学 | 1076篇 |
皮肤病学 | 52篇 |
神经病学 | 153篇 |
特种医学 | 189篇 |
外国民族医学 | 1篇 |
外科学 | 785篇 |
综合类 | 119篇 |
一般理论 | 3篇 |
预防医学 | 253篇 |
眼科学 | 131篇 |
药学 | 342篇 |
中国医学 | 13篇 |
肿瘤学 | 342篇 |
出版年
2023年 | 46篇 |
2022年 | 137篇 |
2021年 | 232篇 |
2020年 | 99篇 |
2019年 | 133篇 |
2018年 | 176篇 |
2017年 | 92篇 |
2016年 | 90篇 |
2015年 | 120篇 |
2014年 | 165篇 |
2013年 | 202篇 |
2012年 | 310篇 |
2011年 | 299篇 |
2010年 | 195篇 |
2009年 | 150篇 |
2008年 | 248篇 |
2007年 | 255篇 |
2006年 | 229篇 |
2005年 | 232篇 |
2004年 | 162篇 |
2003年 | 160篇 |
2002年 | 153篇 |
2001年 | 62篇 |
2000年 | 73篇 |
1999年 | 48篇 |
1998年 | 27篇 |
1997年 | 18篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 11篇 |
1993年 | 19篇 |
1992年 | 42篇 |
1991年 | 42篇 |
1990年 | 33篇 |
1989年 | 22篇 |
1988年 | 25篇 |
1987年 | 17篇 |
1986年 | 28篇 |
1985年 | 13篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 14篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1970年 | 10篇 |
1969年 | 11篇 |
1968年 | 7篇 |
排序方式: 共有4539条查询结果,搜索用时 15 毫秒
31.
Lara Franziska Stolzenbach Giuseppe Rosiello Marina Deuker Thomas Martin Sophie Knipper Zhe Tian Alberto Briganti Kevin C. Zorn Fred Saad Felix K.H. Chun Markus Graefen Pierre I. Karakiewicz 《Urologic oncology》2021,39(2):131.e1-131.e7
BackgroundIt is unknown, whether metastatic prostate cancer (CaP) patients with intermediate life expectancy (5–10 years) should be considered for external beam radiation therapy (EBRT) to the prostate. We addressed this void.MethodsWithin the Surveillance, Epidemiology, and End Results database (2004–2016), we identified 835 M1a or M1b CaP substaged patients with prostate-specific antigen (PSA) < 20 ng/ml and with intermediate life expectancy (LE) 5 to 10 years, treated with EBRT or no EBRT. Inverse probability of treatment-weighting (IPTW), Kaplan-Meier plots and Cox-regression models (CRMs) were used.ResultsOverall, 179 (21.4%) patients received EBRT and 656 (78.6%) did not. EBRT rates increased from 13.9 to 23.8% (2004–2016; P= 0.04). After IPTW-adjustment, median OS was 45 vs. 35 months, in EBRT vs. no EBRT patients (P < 0.001). In IPTW-adjusted Cox-regression models, EBRT independently predicted lower overall mortality (hazard ratio [HR]: 0.7, CI 0.61–0.89; P= 0.001). After stratification according to M1 substages, EBRT was associated with lower overall mortality in M1a (HR: 0.2, CI 0.05–0.91; P= 0.03) and M1b (HR: 0.7, CI 0.55–0.88; P = 0.003) substages.ConclusionEBRT was associated with lower mortality in metastatic CaP patients with low PSA and intermediate LE (5–10 years). In consequence, greater consideration for EBRT should be given in those patients. However, it is important to consider study limitations until clinical trials confirm the proposed benefit. 相似文献
32.
Angela Pecoraro Marina Deuker Giuseppe Rosiello Franziska Stolzenbach Stefano Luzzago Zhe Tian Shahrokh F. Shariat Fred Saad Alberto Briganti Anil Kapoor Cristian Fiori Francesco Porpiglia Pierre I. Karakiewicz 《Urologic oncology》2021,39(4):239.e1-239.e7
BackgroundThe NCCN guidelines recommend active surveillance (AS) as an option for the initial management of cT1a 0-2 cm renal lesions. However, data about comparison between renal cell carcinoma (RCC) 0-2 cm vs. 2.1-4 cm are scarce.MethodsWithin the Surveillance, Epidemiology, and End Results database (2002–2016), 46,630 T1a NanyMany stage patients treated with nephrectomy were identified. Data were tabulated according to histological subtype, tumor grade (low [LG] vs. high [HG]), as well as age category and gender. Additionally, rates of synchronous metastases were quantified.ResultsOverall, 69.3 vs. 74.1% clear cell, 21.4 vs. 17.6% papillary, 6.9 vs. 6.8% chromophobe, 2.0 vs. 1.1% sarcomatoid dedifferentiation, 0.2 vs. 0.2% collecting duct histological subtype were identified for respectively 0-2 cm and 2.1-4 cm RCCs. In both groups, advanced age was associated with higher rate of HG clear cell and HG papillary histological subtype. In 0-2 cm vs. 2.1-4 cm RCCs, 13.8% vs. 20.2% individuals operated on harbored HG tumors and were more prevalent in males. Lower synchronous metastases rates were recorded in 0-2 cm RCC and ranged from 0 in respectively multilocular cystic to 0.9% in HG papillary histological subtype. The highest synchronous metastases rates were recorded in sarcomatoid dedifferentiation histological subtype (13.8% and 9.7%) in both groups.ConclusionsRelative to 2.1-4 cm RCCs, 0-2 cm RCCs harbored lower rates of HG tumors, lower rates of aggressive variant histology and lower rates of synchronous metastases. The indications and demographics of patients selected for AS may be expanded in the future to include younger and healthier patients. 相似文献
33.
34.
35.
36.
37.
38.
Real-time quantitative RT-PCR and detection of tumour cell dissemination in breast cancer patients: plasmid versus cell line dilutions. 总被引:2,自引:0,他引:2
39.
Maria Cîrlan Magida Saad Gabriela Coman Naser Eldin Bilal Ali Magzoub Elbashier Deborah Kreft Susan Snijders Willem van Leeuwen Alex van Belkum 《Infection, genetics and evolution》2005,5(4):335-339
Phenotypically identified methicillin resistant Staphylococcus aureus (MRSA) strains from several hospitals in Romania and Saudi Arabia (n = 103 and 68, respectively) were confirmed to be MRSA by mecA PCR and PBP-2' based latex agglutination. Subsequently, strains were differentiated at the sub-species level using pulsed field gel electrophoresis (PFGE) of SmaI DNA macro-restriction fragments. Comparison of the PFGE fingerprints identified major clusters of strains, persistently present in the various hospitals. Endemicity of certain strains was identified, amongst others one due to a particularly methicillin resistant type in the burn wound sector of the Romanian hospital. No PFGE-based overlap was found between the Saudi and Romanian strains. However, multi locus sequence typing (MLST), performed for 20% of all strains, revealed that genuine genetic similarity was obscured by the PFGE analysis. In both the Romanian and Saudi hospitals the renowned sequence type (ST) 239 was very over-represented. This was especially apparent in Saudi Arabia, where all strains except two shared the ST 239 genotype. This clonal type has previously been identified in a variety of other countries. Despite the MLST concordance, PFGE data indicate that ST 239 diversifies while maintaining its core genome intact. ST 80, another previously but less frequently identified clone, was introduced in 2000 in the Romanian institutes and persisted over the past 3 years as a frequent cause of infections in a surgical department. The successful MRSA types can acquire prominent positions in hospitals of previously low-endemicity MRSA status. 相似文献
40.
Omission of nitrous oxide from a propofol-based anesthetic does not affect the recovery of women undergoing outpatient gynecologic surgery 总被引:3,自引:0,他引:3
Arellano RJ Pole ML Rafuse SE Fletcher M Saad YG Friedlander M Norris A Chung FF 《Anesthesiology》2000,93(2):332-339
BACKGROUND: Although nitrous oxide (N2O) is used commonly during anesthesia, clinically relevant advantages-disadvantages of using this agent are not well established in the ambulatory setting. This study in women undergoing ambulatory gynecologic surgery compares outcomes in patients administered total intravenous anesthesia with propofol versus the propofol plus N2O. The primary outcome was the time to home readiness. Secondary outcomes included the incidence of postanesthetic adverse events. METHODS: Women presenting for elective ambulatory termination of pregnancy or gynecologic laparoscopy were induced with an intravenous sleep dose of propofol and fentanyl. After induction, subjects were randomly allocated to maintenance anesthesia with propofol alone or propofol plus 65% N2O. Patients were assessed by a blinded observer in the postanesthetic care unit at 20-min intervals to determine home readiness. Postoperative pain and nausea were measured with visual analog scales. Postoperative analgesics and antiemetics were recorded. The incidence of adverse events occurring after hospital discharge was assessed by a telephone interview 24 h postoperatively. RESULTS: A total of 740 patients received propofol alone, and 750 patients received propofol plus N2O. Mean home readiness times were not significantly different between treatment groups. There were no significant differences between groups in pain scores, nausea scores, analgesia administration, or antiemetic administration before discharge. There were no significant differences in the frequency of adverse events for 24 h after discharge from hospital. CONCLUSIONS: Omission of N2O from a propofol-based anesthetic for ambulatory gynecologic surgery does not affect time to home readiness or the incidence of postoperative adverse events up to 24 h after discharge from hospital. (Key words: Awareness; outpatient surgery; total intravenous anesthesia.) 相似文献