全文获取类型
收费全文 | 16694篇 |
免费 | 1473篇 |
国内免费 | 63篇 |
专业分类
耳鼻咽喉 | 159篇 |
儿科学 | 494篇 |
妇产科学 | 293篇 |
基础医学 | 2181篇 |
口腔科学 | 529篇 |
临床医学 | 1954篇 |
内科学 | 3459篇 |
皮肤病学 | 203篇 |
神经病学 | 1524篇 |
特种医学 | 709篇 |
外国民族医学 | 3篇 |
外科学 | 1904篇 |
综合类 | 391篇 |
一般理论 | 13篇 |
预防医学 | 1715篇 |
眼科学 | 329篇 |
药学 | 1244篇 |
中国医学 | 5篇 |
肿瘤学 | 1121篇 |
出版年
2021年 | 215篇 |
2020年 | 138篇 |
2019年 | 213篇 |
2018年 | 237篇 |
2017年 | 192篇 |
2016年 | 208篇 |
2015年 | 239篇 |
2014年 | 345篇 |
2013年 | 464篇 |
2012年 | 730篇 |
2011年 | 718篇 |
2010年 | 406篇 |
2009年 | 357篇 |
2008年 | 668篇 |
2007年 | 711篇 |
2006年 | 693篇 |
2005年 | 679篇 |
2004年 | 694篇 |
2003年 | 632篇 |
2002年 | 560篇 |
2001年 | 591篇 |
2000年 | 594篇 |
1999年 | 521篇 |
1998年 | 251篇 |
1997年 | 195篇 |
1996年 | 206篇 |
1995年 | 223篇 |
1994年 | 203篇 |
1993年 | 186篇 |
1992年 | 462篇 |
1991年 | 423篇 |
1990年 | 430篇 |
1989年 | 437篇 |
1988年 | 372篇 |
1987年 | 363篇 |
1986年 | 307篇 |
1985年 | 302篇 |
1984年 | 222篇 |
1983年 | 214篇 |
1982年 | 162篇 |
1981年 | 137篇 |
1980年 | 142篇 |
1979年 | 215篇 |
1978年 | 153篇 |
1977年 | 138篇 |
1976年 | 154篇 |
1974年 | 143篇 |
1973年 | 161篇 |
1972年 | 136篇 |
1970年 | 125篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
13.
The importance of intraoperative cholangiography during laparoscopic cholecystectomy 总被引:4,自引:0,他引:4
E H Phillips G Berci B Carroll L Daykhovsky J Sackier M Paz-Partlow 《The American surgeon》1990,56(12):792-795
Laparoscopic cholecystectomy (LC) using electrocoagulation was successfully performed in 56 out of 58 selected patients. Cholangiography was performed in 53 patients. Six patients had common duct stones; five were unsuspected preoperatively. After the gallbladder was removed, three patients underwent open common duct exploration. In another five cases, anatomical anomalies were discovered. Cholangiography performed via the cystic duct before any structures are divided can prevent the most serious complication--common duct injury. Cholangiography should be attempted on all patients undergoing LC. 相似文献
14.
15.
R. Lazzara A. A. Siddiqui P. Binon S. A. Feldman R. Weiner R. Phillips A. Gonshor 《Clinical oral implants research》1996,7(1):73-83
Osseointegrated dental implants have now become an accepted form of treatment for patients with a fully or partially missing dentition. The purpose of this study was to evaluate the performance of 3i threaded and cylindrical implants. During a 5-year period, a total of 1969 3i endosseous implants were placed at 6 centers in the United States and 2 elsewhere in the edentulous and partially edentulous jaws of 653 consecutive patients ranging in age from 18 to 82 years. Of the total number of implants placed, 1341 were commercially pure titanium threaded implants and 628 were titanium plasma-sprayed implants with a cylindrical configuration. A total of 28 patients with 110 implants were lost to follow-up. Implants in these patients were considered neither a success nor a failure. Success was predicated on the osseointegration of each and every implant followed in this analysis rather than the persistence of prosthetic function. Confirmed bone anchorage was considered essential for success. A total of 625 patients with 1871 implants remain in the study with a follow-up period ranging from 6 to 60 months. A total of 93 implants (5.0% of the total implants followed) were considered as failures. A mean implant survival rate was 95.0% for both the threaded and the cylindrical implant was calculated. The success rate of threaded implants was 97.0% in the mandible and 93.8% in the maxilla. The success rate for the 3.3mm cylindrical implants was 96.0% in the mandible and 95.5% in the maxilla, and the success rate of 4.0mm diameter cylindrical implants was 95% in the mandible and 92.0% in the maxilla. Causes of failure consisted of loss of osseointegration 2.3%crestal bone loss requiring periodontal therapy after the first year of function 1.7% and mechanical problems associated with the prosthesis 0.9%. This retrospective analysis of the 3i endosseous implant system is comparable to previous reports on other implant systems in terms of implant survival and prosthesis stability. It is demonstrated that 3i implants are predictable and can provide lasting osseointegration leading to improvement of oral function if the recommended surgical and restorative protocol is followed. 相似文献
16.
S. Gray S. Lawrence A. Arregui N. Phillips R. Bell T. Richards T. Fukushima H. W. Taeusch 《Journal of the National Medical Association》1995,87(5):353-358
To study some of the factors relating to the care of mothers and newborns in an inner-city hospital, three sources of information were reviewed: an obstetric database including information on prenatal care and perinatal mortality, a database of all admissions to the hospital neonatal intensive care unit over the past 5 years, and a detailed questionnaire concerning attitudes and behaviors of recently delivered women. While analyses from these hospital-based data are not conclusive, the results add evidence for the following propositions: 1) Optimal prenatal care is infrequently obtained by mothers delivering at inner-city hospitals. Lack of prenatal care is clearly associated with increased perinatal mortality. While the need for prenatal care is appreciated by 98% of the mothers in this sample, the most frequent reasons why prenatal care is not obtained earlier or more frequently involve knowledge about and access to prenatal care. 2) Inner-city mothers, in general, manifest attitudes and behaviors that promote the welfare of their pregnancies and newborns. These attitudes and behaviors are in stark contrast to those that are frequently attributed to inner-city women by the media. 3) Acute perinatal medical and nursing care are perceived by many postpartum women as suboptimal, particularly in terms of the lack of respect shown to patients by nurses and doctors. 4) Improved acute obstetric and neonatal care improves perinatal morbidity and mortality of infants delivered at inner-city hospitals. 相似文献
17.
K. A. Rolls P. A. Phillips K. Aldred K. J. Hardy 《Clinical and experimental pharmacology & physiology》1994,21(3):227-230
1. Since plasma renin activity is increased in cyclosporin A (CsA)-induced hypertension in the rat, the role of the vascular renin-angiotensin system (RAS) in CsA-induced hypertension was investigated in rat mesenteric resistance vessels. 2. Female Wistar rats received CsA (10 mg/kg per day, s.c.) or vehicle for 30 days. CsA treatment increased tail-cuff systolic blood pressure (CsA treated 135 ± 3 mmHg vs control 125 ± 1 mmHg, P<0.0001). 3. Mesenteric resistance arteries (200–300 μm) were isolated and mounted in a microvessel myograph. Concentration-response curves to tetradecapeptide renin substrate (10-11-10?6 mol/L), angiotensin I (10-l1-10?6 mol/L) and angiotensin II (10-12-10?6 mol/L) showed no differences between CsA-treated and control groups. 4. Mesenteric vascular angiotensin-converting enzyme (ACE) characteristics were determined by radioligand binding. There were no differences in the content or affinity of ACE between CsA-treated and control rats. 5. These results suggest that the mesenteric vascular RAS does not play a major role in CsA-induced hypertension in the rat. 相似文献
18.
S. L. Grant P. A. Phillips C. B. Gow 《Clinical and experimental pharmacology & physiology》1994,21(3):243-247
1. Epidermal growth factor is a potent mitogen that causes natriuresis, diuresis and inhibition of arginine vasopressin-induced water reabsorption. 2. The aim of this study was to determine any interaction between epidermal growth factor and the V1 (vascular) and/or V2 (antidiuretic) arginine vasopressin receptor subtypes. 3. Radioligand binding displacement assays demonstrated that although arginine vasopressin related peptides displaced both radioligands from renal medullary membranes at low concentrations epidermal growth factor displaced neither. 4. Arginine vasopressin V2 receptor second messenger cyclic adenosine monophosphate (CAMP) production was inhibited by epidermal growth factor (IC50 2 ± 10?7 mol/L) as was sodium fluoride cAMP production but only at much higher concentrations. 5. Therefore the diuretic effect of epidermal growth factor is not via direct antagonism of arginine vasopressin receptors but seems mediated via inhibition of the V2 second messenger system. 相似文献
19.
SUMMARY A case congenital dislocation of both knees and dislocation of the left hip in an infant whose mother had a chronic amniotic fluid leakage after mid-trimester amniocentesis. 相似文献
20.
Topical dexamethasone was used to elevate rabbit intraocular pressure in order to study the interaction with a steroid antagonist, mifepristone. Dexamethasone did not cause a consistently significant increase in intraocular pressure. Animals treated with mifepristone followed by dexamethasone showed no apparent increase in intraocular pressure after dexamethasone, indeed mifepristone caused a lower intraocular pressure than seen in other groups whether in the presence or absence of dexamethasone. Reductions of intraocular pressure when mifepristone was given after 14 days of dexamethasone administration were not found. No conclusion can be reached regarding any dexamethasone antagonism by mifepristone, except that intraocular pressure tended to be lower even in the presence of dexamethasone. 相似文献