全文获取类型
收费全文 | 1077292篇 |
免费 | 71875篇 |
国内免费 | 1374篇 |
专业分类
耳鼻咽喉 | 15034篇 |
儿科学 | 34673篇 |
妇产科学 | 28648篇 |
基础医学 | 153737篇 |
口腔科学 | 29624篇 |
临床医学 | 95069篇 |
内科学 | 204311篇 |
皮肤病学 | 24405篇 |
神经病学 | 81654篇 |
特种医学 | 43036篇 |
外国民族医学 | 201篇 |
外科学 | 163583篇 |
综合类 | 21708篇 |
现状与发展 | 1篇 |
一般理论 | 263篇 |
预防医学 | 74669篇 |
眼科学 | 24543篇 |
药学 | 86288篇 |
7篇 | |
中国医学 | 2806篇 |
肿瘤学 | 66281篇 |
出版年
2019年 | 7791篇 |
2018年 | 11333篇 |
2017年 | 8943篇 |
2016年 | 10124篇 |
2015年 | 11317篇 |
2014年 | 15324篇 |
2013年 | 22280篇 |
2012年 | 30641篇 |
2011年 | 32398篇 |
2010年 | 19018篇 |
2009年 | 17868篇 |
2008年 | 30047篇 |
2007年 | 32190篇 |
2006年 | 32830篇 |
2005年 | 31177篇 |
2004年 | 29856篇 |
2003年 | 28688篇 |
2002年 | 27671篇 |
2001年 | 60085篇 |
2000年 | 61549篇 |
1999年 | 51028篇 |
1998年 | 12490篇 |
1997年 | 11046篇 |
1996年 | 11074篇 |
1995年 | 10366篇 |
1994年 | 9386篇 |
1993年 | 8885篇 |
1992年 | 37850篇 |
1991年 | 36339篇 |
1990年 | 35799篇 |
1989年 | 34338篇 |
1988年 | 30930篇 |
1987年 | 30018篇 |
1986年 | 28248篇 |
1985年 | 26472篇 |
1984年 | 19215篇 |
1983年 | 16122篇 |
1982年 | 8824篇 |
1979年 | 17047篇 |
1978年 | 11410篇 |
1977年 | 10234篇 |
1976年 | 8841篇 |
1975年 | 10069篇 |
1974年 | 11651篇 |
1973年 | 11274篇 |
1972年 | 10755篇 |
1971年 | 10092篇 |
1970年 | 9254篇 |
1969年 | 8939篇 |
1968年 | 7918篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
101.
R K Beals 《Journal of pediatric orthopedics》1990,10(6):717-720
Three patients who experienced premature complete physeal closure of the ipsilateral limb following diaphyseal fractures are reported. The diagnosis was recognized because of unexpected progressive limb length discrepancy following fracture healing. The cause is unknown. This phenomenon should be recognized by those treating fractures in children. 相似文献
102.
T F Kruger J P Van der Merwe H J Odendaal F S Stander G M Grobler V A Hulme E L Erasmus K Coetzee M L Windt Y Swart 《Suid-Afrikaanse tydskrif vir geneeskunde》1990,77(12):634-636
The results of the in vitro fertilisation programme at Tygerberg Hospital for the period April 1983 to January 1988 are presented. Of the 1117 laparoscopies performed, 825 patients reached the transfer stage. A live-birth rate of 9.3% was achieved. The pregnancy rate after transfer of 4 embryos was 25.9% compared with 15.4% after 2 embryos and 10.8% after 3 embryos (P = less than 0.0001). The multiple pregnancy rate was 2.8% in the group receiving 2 embryos and 11.7% and 10.4% in those receiving 3 and 4 embryos, respectively. Of the 77 successful pregnancies (90 babies), 1 baby died at 34 weeks' gestation as the result of abruptio placentae due to preeclampsia and 1 cot death occurred. The only congenital abnormality encountered was a cleft palate. 相似文献
103.
V K Kudriashov V A Semenchenia 《Klinichna khirurhiia / Ministerstvo okhorony zdorov'ia Ukra?ny, Naukove tovarystvo khirurhiv Ukra?ny》1990,(5):4-5
On the basis of the experience with treatment of more than 500 patients with sigmoid and rectal cancer, the informative value of the instrumental methods of investigation used for more precise definition of a stage of the disease is analysed. A scheme for rational examination of the patients is suggested. 相似文献
104.
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
105.
1. Effects of a novel imidazoindole derivative on cholinergic function were studied in isolated tissue preparations. 2. The compound demonstrated a dose-dependent (10(-11)-10(-9) potentiation (20-60%) of acetylcholine induced tension in guinea pig ileal tissue. 3. Increases in the size of end-plate potentials and nerve evoked muscle twitches were observed in frog nerve-skeletal muscle preparations. 4. Cholinesterase activity was not inhibited. 5. The results suggest that the compound has actions at the post-synaptic muscarinic receptor complex in smooth muscle and causes pre-synaptic increases in ACh release at the neuromuscular junction. 相似文献
106.
107.
Patient history and clinical examination are important for the diagnosis of degenerative joint disease. Here the typical statements of a patient suffering from early osteoarthritis are described and, as far as possible, explained. The joint in question must be systematically examined. Furthermore, the neighboring joints and soft-tissue structures, i.e., muscles, tendons etc., should be examined and evaluated with respect to their importance in hindering the functional chain. The neuroreflectory mechanisms involved herein are described. 相似文献
108.
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
109.
The results of a controlled randomized and prospective clinical study including 113 patients from March 1987 until August 1988 showed that prophylactic drainage in elective resection for cancer of the colon was not necessary. 60 patients received a drain, 53 patients were not drained. The drain turned out to be ineffective even concerning its expected function of draining intraabdominal fluid: its diagnostic and therapeutic value failed in clinical practice. The rate of surgical complications--i.e. anastomotic leakage, impaired wound healing and relaparotomy--was significantly higher in the drained group. In elective colon resection the use of a drain as a routine procedure cannot be recommended. 相似文献
110.
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