全文获取类型
收费全文 | 4042篇 |
免费 | 260篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 59篇 |
儿科学 | 307篇 |
妇产科学 | 42篇 |
基础医学 | 482篇 |
口腔科学 | 104篇 |
临床医学 | 305篇 |
内科学 | 801篇 |
皮肤病学 | 146篇 |
神经病学 | 182篇 |
特种医学 | 315篇 |
外科学 | 549篇 |
综合类 | 125篇 |
预防医学 | 184篇 |
眼科学 | 132篇 |
药学 | 316篇 |
1篇 | |
中国医学 | 12篇 |
肿瘤学 | 263篇 |
出版年
2023年 | 26篇 |
2021年 | 94篇 |
2020年 | 57篇 |
2019年 | 64篇 |
2018年 | 100篇 |
2017年 | 60篇 |
2016年 | 70篇 |
2015年 | 82篇 |
2014年 | 118篇 |
2013年 | 146篇 |
2012年 | 224篇 |
2011年 | 222篇 |
2010年 | 156篇 |
2009年 | 123篇 |
2008年 | 153篇 |
2007年 | 162篇 |
2006年 | 153篇 |
2005年 | 139篇 |
2004年 | 122篇 |
2003年 | 109篇 |
2002年 | 94篇 |
2001年 | 90篇 |
2000年 | 58篇 |
1999年 | 89篇 |
1998年 | 101篇 |
1997年 | 96篇 |
1996年 | 75篇 |
1995年 | 75篇 |
1994年 | 53篇 |
1993年 | 66篇 |
1992年 | 86篇 |
1991年 | 79篇 |
1990年 | 61篇 |
1989年 | 96篇 |
1988年 | 79篇 |
1987年 | 63篇 |
1986年 | 70篇 |
1985年 | 56篇 |
1984年 | 43篇 |
1983年 | 33篇 |
1982年 | 33篇 |
1981年 | 32篇 |
1980年 | 29篇 |
1979年 | 36篇 |
1978年 | 26篇 |
1977年 | 31篇 |
1976年 | 43篇 |
1975年 | 29篇 |
1970年 | 28篇 |
1969年 | 27篇 |
排序方式: 共有4325条查询结果,搜索用时 15 毫秒
11.
12.
13.
D De AJ Kanwar S Handa 《Journal of the European Academy of Dermatology and Venereology》2006,20(7):853-859
BACKGROUND: Diagnosis of atopic dermatitis (AD) depends on clinical features because no definitive diagnostic test exists. Criteria proposed by Hanifin and Rajka (Acta Derm Venereol (Stockh) 1980; Suppl 92: 44-47) were acceptable for hospital-based studies but were found not to be suitable for field studies. A UK working party formulated clinical diagnostic criteria that could be used in both hospital and epidemiological settings. Validation studies of the criteria showed widely variable results, probably due to different clinical settings and ethnicity. AIM AND OBJECTIVE: This study was undertaken to validate Hanifin and Rajka's criteria and to assess the comparative efficacy of their criteria and the UK working party's diagnostic criteria in the diagnosis of AD in a hospital setting in North India. SUBJECTS AND METHODS: This study serially included 101 patients with AD and 48 controls of paediatric age group. The study period was from July 2003 to December 2004. RESULTS: Hanifin and Rajka's criteria (sensitivity 96%, specificity 93.75%, positive predictive value 97% (PPV) and negative predictive value (NPV) 91.84%) had a statistical advantage over the UK working party's diagnostic criteria (sensitivity 86%, specificity 95.83%, PPV 97.75% and NPV 76.67%), with a P-value < 0.005. 相似文献
14.
SUMMARY Impotence is a common symptom which can cause considerable distress to both the sufferer and his partner. The use of pharmacotherapy to improve erectile function will continue to increase as safe and effective drugs are developed. However, restoring erectile function should not be the only treatment objective. It is also essential to address personal and emotional factors in the sufferer, conflicts in his relationship with his partner, and sexual problems in his partner, all of which may be instrumental in causing or maintaining the presenting impotence. We advocate a combined approach with appropriate medical treatment and sex and couple therapy 相似文献
15.
P Majumdar G L Khanna V Malik S Sachdeva M Arif M Mandal 《British journal of sports medicine》1997,31(4):342-345
OBJECTIVE: To estimate the training load of specific on court training regimens based on the magnitude of variation of heart rate-lactate response during specific training and to determine the magnitude of variation of biochemical parameters (urea, uric acid, and creatine phosphokinase (CPK)) 12 hours after the specific training programme so as to assess training stress. METHODS: The study was conducted on six national male badminton players. Maximum oxygen consumption (VO2), ventilation (VE), heart rate, and respiratory quotient were measured by a protocol of graded treadmill exercise. Twelve training sessions and 35 singles matches were analysed. Heart rate and blood lactate were monitored during technical training routines and match play. Fasting blood samples collected on two occasions--that is, during off season and 12 hours after specific training--were analysed for serum urea, uric acid, and CPK. RESULTS: Analysis of the on court training regimens showed lactate values of 8-10.5 mmol/l in different phases. The percentage of maximum heart rate ranged from 82% to 100%. Urea, uric acid, and CPK activity showed significant changes from (mean (SD)) 4.93 (0.75) mmol/l to 5.49 (0.84) mmol/l, 0.23 (0.04) to 0.33 (0.06) mmol/l, and 312 (211.8) to 363 (216.4) IU/l respectively. CONCLUSION: Maximum lactate reported in the literature ranges from 3-6 mmol/l. Comparatively high lactate values and high percentage of maximum heart rate found in on court training show a considerable stress on muscular and cardiovascular system. The training load needs appropriate monitoring to avoid over-training. Workouts that are too intensive may interfere with coordination, a factor that is important in sports requiring highly technical skill such as badminton. 相似文献
16.
Acute appendicitis: CT and US correlation in 100 patients 总被引:19,自引:1,他引:18
17.
18.
Perforated colorectal neoplasms: correlation of clinical, contrast enema, and CT examinations 总被引:2,自引:0,他引:2
Hulnick DH; Megibow AJ; Balthazar EJ; Gordon RB; Surapenini R; Bosniak MA 《Radiology》1987,164(3):611-615
Results of clinical, contrast enema (CE), and computed tomographic (CT) examinations in 39 patients with perforated colorectal neoplasms were retrospectively reviewed. Twenty patients were toxemic at initial presentation, but in only four patients was the diagnosis of perforated colorectal neoplasm initially suspected clinically. CE study was performed in 22 patients and enabled the diagnosis of perforated neoplasm in 11 cases, neoplasm alone in eight, and neither neoplasm nor perforation in three. CT was performed in 38 patients and enabled the diagnosis of perforated neoplasm in 36; pericolic phlegmon but no mass lesion was evident in two. In 16 patients, CT also demonstrated metastatic disease. Because of its reliability in establishing the diagnosis and staging the extent of the inflammatory and neoplastic disease, CT is indicated in cases of suspected or proved perforated colorectal neoplasm and in cases in which CE study findings are indeterminate or suggestive of perforated neoplasm. 相似文献
19.
Intraabdominal pressures during natural activities in patients treated with continuous ambulatory peritoneal dialysis 总被引:2,自引:0,他引:2
Z J Twardowski R Khanna K D Nolph A Scalamogna M H Metzler T W Schneider B F Prowant L P Ryan 《Nephron》1986,44(2):129-135
Intraabdominal pressures were measured during natural activities in 6 men, age 24-62 years, treated with continuous ambulatory peritoneal dialysis. The pressures were measured with a pressure transducer secured at the level of the umbilicus in the supine, sitting, and upright positions with 0-3 liters intraperitoneal fluid during talking, coughing, straining, changing position, walking, jogging, exercycling, jumping and weight lifting. Coughing and straining generated the highest intraabdominal pressures in every position. The pressures with weight lifting were proportional to the magnitude of the weight lifted up to 50 lbs, but were lower than those during coughing and straining. The pressures were generally higher with greater intraabdominal fluid volumes, especially with jumping and coughing. Exercycling was associated with lower intraabdominal pressure than was jogging, and the pressures were only minimally influenced by intraperitoneal fluid volumes. The results of this study can be used as a guide in establishing preventive measures in patients with intraperitoneal fluid to decrease complication rates related to raised intraabdominal pressures such as dialysate leaks, hernias and hemorrhoids. 相似文献
20.
A K Khanna M R Singh S Khanna N N Khanna 《Journal of the Indian Medical Association》1991,89(7):192-195
Fine needle aspiration cytology, imprint cytology and tru-cut needle biopsy were performed in 86 patients with breast lump and the results of these techniques were finally compared with the incisional or excisional biopsy in all the patients. Fine needle aspiration cytology had the sensitivity of 96.8% and specificity of 100%, the imprint cytology had the sensitivity of 98.4% and specificity of 100%. While the tru-cut needle biopsy had the sensitivity and specificity of 100% though in this technique 15 of 86 (17.4%) specimens were rejected as insufficient for any diagnosis. 相似文献