全文获取类型
收费全文 | 18782篇 |
免费 | 1426篇 |
国内免费 | 43篇 |
专业分类
耳鼻咽喉 | 170篇 |
儿科学 | 507篇 |
妇产科学 | 337篇 |
基础医学 | 2476篇 |
口腔科学 | 657篇 |
临床医学 | 1840篇 |
内科学 | 4344篇 |
皮肤病学 | 187篇 |
神经病学 | 1776篇 |
特种医学 | 723篇 |
外国民族医学 | 1篇 |
外科学 | 2286篇 |
综合类 | 393篇 |
一般理论 | 16篇 |
预防医学 | 1596篇 |
眼科学 | 517篇 |
药学 | 1313篇 |
中国医学 | 10篇 |
肿瘤学 | 1102篇 |
出版年
2022年 | 93篇 |
2021年 | 253篇 |
2020年 | 148篇 |
2019年 | 252篇 |
2018年 | 284篇 |
2017年 | 233篇 |
2016年 | 256篇 |
2015年 | 311篇 |
2014年 | 437篇 |
2013年 | 779篇 |
2012年 | 1037篇 |
2011年 | 1114篇 |
2010年 | 588篇 |
2009年 | 607篇 |
2008年 | 1121篇 |
2007年 | 1220篇 |
2006年 | 1239篇 |
2005年 | 1226篇 |
2004年 | 1141篇 |
2003年 | 1103篇 |
2002年 | 1109篇 |
2001年 | 284篇 |
2000年 | 259篇 |
1999年 | 265篇 |
1998年 | 281篇 |
1997年 | 248篇 |
1996年 | 223篇 |
1995年 | 229篇 |
1994年 | 187篇 |
1993年 | 172篇 |
1992年 | 210篇 |
1991年 | 179篇 |
1990年 | 197篇 |
1989年 | 160篇 |
1988年 | 192篇 |
1987年 | 190篇 |
1986年 | 165篇 |
1985年 | 176篇 |
1984年 | 171篇 |
1983年 | 152篇 |
1982年 | 197篇 |
1981年 | 204篇 |
1980年 | 153篇 |
1979年 | 133篇 |
1978年 | 104篇 |
1977年 | 83篇 |
1976年 | 74篇 |
1975年 | 71篇 |
1974年 | 87篇 |
1972年 | 73篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
Robert J Barry Adam R Clarke Rory McCarthy Mark Selikowitz 《Clinical neurophysiology》2006,117(2):243-251
OBJECTIVE: This study investigated intrahemispheric and interhemispheric EEG coherences as a function of age in girls with different DSM-IV subtypes of Attention-Deficit/Hyperactivity Disorder (AD/HD). It completes a series of 3 studies aimed at clarifying developmental and gender impacts on the coupling between brain regions in this disorder. METHODS: Three groups of 40 children (AD/HD combined type, AD/HD inattentive type, and normal controls) participated. Each group contained 8 females in each of 5, 1-year age bands from 8 to 12 years. EEG was recorded from 21 sites during an eyes-closed resting condition. Wave-shape coherence was calculated for 8 intrahemispheric electrode pairs (4 in each hemisphere), and 8 interhemispheric electrode pairs, within each of the delta, theta, alpha and beta bands. RESULTS: Developmental effects in intrahemispheric coherences at shorter and longer inter-electrode distances were not as predicted by Thatcher's two-compartment model, contrary to previous findings in boys. Females with AD/HD showed evidence of developmental delay and widespread anomalous elevations in coherence. Girls with AD/HD of the combined type showed similar but greater anomalies than girls with AD/HD of the inattentive type. CONCLUSIONS: Girls with AD/HD show coherence anomalies relative to age- and gender-matched controls, which differ substantially from those shown by boys with AD/HD. These coherence anomalies did not differ in nature between girls with different DSM-IV subtypes of AD/HD, suggesting that subtype differences in girls reflect only symptom severity. SIGNIFICANCE: The data reported here indicate qualitative differences in EEG coherences in girls with AD/HD compared with controls, and quantitative differences between girls with different subtypes of AD/HD. Both sets of effects differ in nature from those previously found in boys with AD/HD, showing the need to carefully consider gender in future studies of AD/HD. 相似文献
93.
94.
Vivian L. Clark T. Barry Levine 《Catheterization and cardiovascular interventions》1992,25(2):132-134
A 60 year male, orthotopic heart transplant recipient developed a fatal left ventricular outflow obstruction secondary to thrombus at 38 months post transplant. Although he had episodes of mild to moderate rejection at 2 and 16 months post transplant, subsequent biopsies were negative and annual cardiac catheterizations showed mild left ventricular hypokinesis and normal coronary arteries. This case represents a catastrophic complication of transplant rejection and illustrates the problems with identifying rejection using current diagnostic methods. 相似文献
95.
Mehernoor F. Watcha Manuel Ramirez-Ruiz Paul F. White M. Barry Jones Richard G. Lagueruela Raghu P. Terkonda 《Journal canadien d'anesthésie》1992,39(7):649-654
Prophylactic administration of analgesics before surgery can decrease the intraoperative anaesthetic requirement and decrease pain during the early postoperative period. In a double-blind, placebo-controlled study involving 90 healthy ASA physical status I or II children undergoing bilateral myringotomy, we compared the postoperative analgesic effects of oral acetaminophen and ketorolac, when administered 30 min before induction of anaesthesia. Patients were randomized to receive saline (0.1 ml.kg-1), acetaminophen (10 mg.kg-1) or ketorolac (1 mg.kg-1) diluted in cherry syrup to a total volume of 5 ml. Anaesthesia was induced and maintained with halothane and nitrous oxide via a face mask. Postoperative pain was assessed by a blinded observer using an objective pain scale. The three study groups were similar with respect to demographic data, duration of anaesthesia and surgery, induction behaviour, oxygen saturation, incidence of postoperative emesis and, recovery times. The ketorolac group had lower postoperative pain scores and required less frequent analgesic therapy in the early postoperative period compared with the acetaminophen and placebo groups. In contrast, there were no differences in pain scores or analgesic requirements between the acetaminophen and the placebo groups. We conclude that the preoperative administration of oral ketorolac, but not acetaminophen, provided better postoperative pain control than placebo in children undergoing bilateral myringotomy. 相似文献
96.
97.
Elisa Faybush David C Mulligan Barry D Birch Joseph I Sirven Vijayan Balan 《Liver transplantation》2005,11(4):467-468
There are no published accounts of patients with ventriculoperitoneal shunts undergoing liver transplantation in the literature. Because patients with ventriculoperitoneal shunts are prone to infections, this may be a theoretical contraindication to transplantation. We present a case of a patient with cirrhosis who had a ventriculoperitoneal shunt placed many years prior to transplantation. The patient had no neurological complications and the shunt was intact and functioning. Prior to transplantation, the patient underwent a ventriculoperitoneal to ventriculopleural shunt conversion that was reversed posttransplantation. Apart from some minor complications, the patient has done remarkably well from a graft and neurological perspective. In conclusion, patients who have ventriculoperitoneal shunts may be considered for liver transplantation as the risk of infectious and neurological complications is low and there are no deleterious effects on graft survival. 相似文献
98.
Kazumasa Fujitani Jaffer A. Ajani Christopher H. Crane Barry W. Feig Peter W. Pisters Nora Janjan Garrett L. Walsh Stephen G. Swisher Ara A. Vaporciyan David Rice Angela Welch Jackie Baker Josephine Faust Paul F. Mansfield MD 《Annals of surgical oncology》2007,14(4):1305-1311
Background Significant tumor downstaging has been achieved in patients with localized gastric or gastroesophageal adenocarcinoma by induction
chemotherapy and preoperative chemoradiotherapy (CTX–CTXRT). However, the influence of CTX–CTXRT on operative morbidity and
mortality has not yet been clarified. The aim of the present study was to document the frequency and nature of morbidity and
mortality after surgery combined with CTX–CTXRT, and identify factors predictive of postoperative complications in patients
with localized gastric or gastroesophageal adenocarcinoma.
Methods A prospectively collected database on 71 consecutive patients who underwent CTX–CTXRT at M.D. Anderson Cancer Center between
January 1997 and August 2004 was reviewed. Postoperative morbidity and mortality were investigated, and risk factors for overall
complications were identified by multivariate logistic regression analysis.
Results Overall morbidity and mortality rates were 38.0% (27 patients) and 2.8% (2 patients), respectively. Age greater than 60 years
[relative risk 11.3 (95% confidence interval 2.50–50.6)] and body mass index (BMI) of 26 kg/m2 or above [relative risk 4.08 (95% confidence interval 1.08–15.4)] were significant risk factors for overall complications.
Conclusions CTX–CTXRT can be performed safely with an acceptable operative morbidity and a low operative mortality rate in patients with
gastric or gastroesophageal cancer, with careful consideration of added risk associated with age and obesity. 相似文献
99.
Muhammad Al-Kaylani Peter Konrad Barry Lazenby Bennett Blumenkopf Bassel Abou-Khalil 《Seizure》2007,16(2):95-98
Data are limited on seizure recurrence after antiepileptic drug (AED) discontinuation in operated seizure-free patients. We reviewed seizure outcome in patients who came off AEDs after being seizure-free for 2 years following temporal lobe surgery in our center. Thirty-nine (68%) of 57 patients who discontinued AED therapy remained seizure-free. They had a younger age at surgery than the group with seizure recurrence (p=0.01). Earlier surgery may be a favorable predictor for seizure freedom after AED discontinuation. 相似文献
100.