全文获取类型
收费全文 | 1048111篇 |
免费 | 78765篇 |
国内免费 | 2778篇 |
专业分类
耳鼻咽喉 | 13581篇 |
儿科学 | 35747篇 |
妇产科学 | 29431篇 |
基础医学 | 151758篇 |
口腔科学 | 28560篇 |
临床医学 | 95266篇 |
内科学 | 203903篇 |
皮肤病学 | 23555篇 |
神经病学 | 83949篇 |
特种医学 | 40001篇 |
外国民族医学 | 309篇 |
外科学 | 157909篇 |
综合类 | 24457篇 |
现状与发展 | 1篇 |
一般理论 | 451篇 |
预防医学 | 82418篇 |
眼科学 | 23715篇 |
药学 | 74915篇 |
3篇 | |
中国医学 | 2083篇 |
肿瘤学 | 57642篇 |
出版年
2018年 | 11547篇 |
2017年 | 8918篇 |
2016年 | 10154篇 |
2015年 | 11448篇 |
2014年 | 15834篇 |
2013年 | 24152篇 |
2012年 | 32078篇 |
2011年 | 34195篇 |
2010年 | 20404篇 |
2009年 | 19209篇 |
2008年 | 31879篇 |
2007年 | 33704篇 |
2006年 | 34208篇 |
2005年 | 32959篇 |
2004年 | 32139篇 |
2003年 | 30770篇 |
2002年 | 29683篇 |
2001年 | 47346篇 |
2000年 | 48342篇 |
1999年 | 40752篇 |
1998年 | 11842篇 |
1997年 | 10654篇 |
1996年 | 10669篇 |
1995年 | 10248篇 |
1994年 | 9501篇 |
1993年 | 8865篇 |
1992年 | 32562篇 |
1991年 | 31778篇 |
1990年 | 31269篇 |
1989年 | 30134篇 |
1988年 | 27412篇 |
1987年 | 27558篇 |
1986年 | 25652篇 |
1985年 | 24855篇 |
1984年 | 18796篇 |
1983年 | 15862篇 |
1982年 | 9744篇 |
1981年 | 8827篇 |
1980年 | 8244篇 |
1979年 | 17079篇 |
1978年 | 12476篇 |
1977年 | 10566篇 |
1976年 | 9952篇 |
1975年 | 10361篇 |
1974年 | 12523篇 |
1973年 | 11998篇 |
1972年 | 11026篇 |
1971年 | 10238篇 |
1970年 | 9471篇 |
1969年 | 8802篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
102.
Extravesical versus Leadbetter-Politano ureteroneocystostomy: a comparison of urological complications in 320 renal transplants 总被引:3,自引:0,他引:3
The urological complications of 320 consecutive renal transplants performed at our institution between October 17, 1985 and November 10, 1989 are reviewed. The Leadbetter-Politano technique of ureteroneocystostomy was used in the first 160 patients (group 1) and an anterior extravesical technique modified from the methods of Witzel, Sampson and Lich was performed in the second 160 patients (group 2). Urological complications occurred in 15 patients (9.4%) in group 1 and 6 (3.7%) in group 2 (p = 0.04). Ureterovesical junction obstruction occurred in 6 patients (3.7%) in group 1 and 1 (0.6%) in group 2 (p = 0.05). Complications of leakage, ureteral necrosis and ureteral stricture were comparable in the 2 groups. Therefore, we advocate the use of the anterior extravesical technique over Leadbetter-Politano ureteral reimplantation based on the lower incidence of urological complications and various technical advantages, including less operative time, avoidance of a separate cystotomy, less hematuria and ability to use short donor ureters. 相似文献
103.
104.
Preservation of the breast with a good or excellent cosmetic appearance is achievable in most patients. Careful attention to the details of surgical technique allows these procedures to be carried out easily and comfortably for the patient and the surgeon alike. 相似文献
105.
N V Kornilov B M Rachkov V I Kulik V M Kustov 《Vestnik khirurgii imeni I. I. Grekova》1990,145(8):62-66
A retrospective analysis of results of treatment of 104 patients with fractures of long tubular bones associated with injuries of peripheral nerves has shown complex therapy to be necessary. Main components of this treatment were biogenic stimulators, vitamin B12, spasmolytic and dehydration drugs in combination with electrophoresis with potassium iodide and thermal procedures. Rapid disturbance of conductivity of nerve trunks after trauma should be followed by revision of the given segment of the extremity in order to remove hematoma and make reposition of displaced fragments of the bone, which can provide recovery of the disturbed function of the nerve. 相似文献
106.
D A Evans B N Hamid E M Hoare 《Journal of the Royal College of Surgeons of Edinburgh》1990,35(1):33-35
Thirteen cases of primary appendicular adenocarcinoma are reported. This rare tumour usually presents as acute appendicitis. The correct diagnosis is rarely entertained before or during surgery. The main treatment choice lies between appendicectomy alone and appendicectomy followed by right hemicolectomy. There are anatomical reasons for advising the latter and survival figures from the literature tend to support this preference. The cases reported here indicate that in the period 1972-1984, in the North West Region, there was a slight preference for appendicectomy alone. The additional procedure of right hemicolectomy did not confer any clear-cut survival advantage. 相似文献
107.
K Y Mumcuoglu J Miller R Gofin B Adler F Ben-Ishai R Almog D Kafka S Klaus 《Public health reviews》1990,18(4):335-344
BACKGROUND: The aim was to determine the influence of the socioeconomic status of the family and the hygienic practices in the home on the prevalence of head lice infestation in children. METHODS: The study was carried out by analyzing the answers to a standardized epidemiological questionnaire given to parents of school children aged 4-17 in Bet Shemesh, a medium-sized urban town 25 km from Jerusalem. RESULTS: Of 3,000 questionnaires distributed, 958 (31.9%) were completed and returned. The majority of the children (72.4%) had been previously infested with lice. Half of them had other family members, mainly brothers and sisters, who had been infested in the past with lice. In 97.5% of the families the mother was responsible for examining the children for lice, and for carrying out treatment when infestation was present. An association was found between presence of lice infestation and mother's education, age of child, and frequency of shampooing, combing, and examination for lice. There was no association between infestation rates and mother's country of origin, crowding in the home, and the sharing of combs, brushes, hats, scarves, towels, and clothes. CONCLUSIONS: There is evidence that the incidence of lice infestation depends on the hygienic practices in the home rather than on the socioeconomic status of the family or sharing of personal articles among family members. 相似文献
108.
From 1979 to 1987 1428 patients with blunt abdominal trauma were treated in the Department of Surgery of the University of Freiburg; 119 patients had intestinal injuries. They were mainly young adults who had sustained a car accident. 71.3% of the small bowel injuries were overseen, 14.2% needed resection, and in 14.5% an operative procedure was not necessary. The surgical procedure for colonic injuries has to be chosen with regard to the age and general condition of the patient, to the severity of the trauma, to associated injuries and to the stage of peritonitis. Accordingly, 18% of the patients were treated with and 58% without a protective colostomy, 24% could be treated conservatively. Mortality and morbidity correlated with the severity of associated injuries. Morbidity was also dependent on the time interval between accident and operative therapy. 相似文献
109.
Serum bone-gla protein after fracture 总被引:2,自引:1,他引:1
K J Obrant B Merle J Bejui P D Delmas 《Clinical orthopaedics and related research》1990,(258):300-303
Serum bone Gamma-carboxyglutamic acid (bone-gla) protein (BGP), a marker of bone formation, was measured in serial blood samples drawn from 14 patients who had fractured at least one of their tibial or femoral diaphyses and from two other patients who had sustained major trauma without fracture but who had been immobilized. A total of 85 samples were taken and analyzed during the first three months after the fractures occurred. Serum BGP significantly increased and positively correlated with the time that had elapsed after the fracture, with an average twofold increase after two months. The fracture site and the duration of immobilization had no influence on the serum BGP levels. Serum BGP levels from the two non-fractured cases increased in the first two weeks with no subsequent consistent trend. These data suggest that serum BGP increases one to two months after a major fracture, possibly as a manifestation of bone repair. Further studies are required to determine the potential clinical value of serum BGP in the management of such patients. 相似文献
110.
Aaron H. Burstein Pharm.D. William G. Reiss Pharm.D. Eric Kantor B.A. Gail D. Anderson Ph.D. 《Pharmacotherapy》1998,18(6):1271-1276
Study Objective . To characterize cytochrome P450 (CYP) 3A4 activity in premenopausal and postmenopausal women by evaluating the urinary 6-β-hydroxycortisokcortisol ratio. Design . Prospective study. Subjects . Thirteen premenopausal and 13 postmenopausal women who were healthy and not receiving drugs known to affect CYP3A4 activity. Interventions . Beginning on day 2 of menses, premenopausal women collected first morning urine samples every other day for a complete menstrual cycle. Postmenopausal women collected first morning urine every other day for 28 days. Measurements and Main Results . Mean weekly 6-β-hydroxycortisol:cortisol ratios did not differ during the phase (week) of the menstrual cycle. Daily ratios did not differ in postmenopausal women. No difference between premenopausal and postmenopausal women was found on comparing overall median ratios. Conclusion . Cytochrome P450 3A4 activity as measured by 6-β-hydroxy cortisol:cortisol ratio did not differ by week of menstrual cycle, suggesting no menstrual cycle-related changes. Menopause does not appear to be associated with differences in CYP3A4 activity, compared with premenopause. 相似文献