全文获取类型
收费全文 | 19945篇 |
免费 | 1803篇 |
国内免费 | 41篇 |
专业分类
耳鼻咽喉 | 104篇 |
儿科学 | 614篇 |
妇产科学 | 543篇 |
基础医学 | 2895篇 |
口腔科学 | 291篇 |
临床医学 | 2588篇 |
内科学 | 3846篇 |
皮肤病学 | 447篇 |
神经病学 | 1927篇 |
特种医学 | 783篇 |
外科学 | 2531篇 |
综合类 | 626篇 |
一般理论 | 15篇 |
预防医学 | 1667篇 |
眼科学 | 262篇 |
药学 | 1326篇 |
中国医学 | 16篇 |
肿瘤学 | 1308篇 |
出版年
2021年 | 307篇 |
2020年 | 216篇 |
2019年 | 321篇 |
2018年 | 372篇 |
2017年 | 302篇 |
2016年 | 283篇 |
2015年 | 314篇 |
2014年 | 454篇 |
2013年 | 674篇 |
2012年 | 938篇 |
2011年 | 904篇 |
2010年 | 524篇 |
2009年 | 504篇 |
2008年 | 874篇 |
2007年 | 906篇 |
2006年 | 918篇 |
2005年 | 820篇 |
2004年 | 836篇 |
2003年 | 796篇 |
2002年 | 678篇 |
2001年 | 688篇 |
2000年 | 721篇 |
1999年 | 628篇 |
1998年 | 243篇 |
1997年 | 203篇 |
1996年 | 208篇 |
1995年 | 191篇 |
1994年 | 187篇 |
1993年 | 179篇 |
1992年 | 468篇 |
1991年 | 452篇 |
1990年 | 415篇 |
1989年 | 374篇 |
1988年 | 355篇 |
1987年 | 397篇 |
1986年 | 364篇 |
1985年 | 370篇 |
1984年 | 294篇 |
1983年 | 256篇 |
1982年 | 163篇 |
1981年 | 160篇 |
1980年 | 133篇 |
1979年 | 241篇 |
1978年 | 198篇 |
1977年 | 140篇 |
1975年 | 116篇 |
1974年 | 166篇 |
1973年 | 162篇 |
1972年 | 152篇 |
1971年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Marilyn Anne Murphy M.S. 《Journal of medical systems》1986,10(2):109-120
This paper identifies the need for more specific guidelines in preparing faculty to use and develop computer-based instructional materials. Cory's model for faculty development is described and planning considerations are outlined. Finally, components of this multifaceted approach to faculty development—identifying available resources, emphasizing the current uses of computers, providing computer literacy/faculty awareness sessions, focusing on the instructional use of microcomputers, collaboration, and communication—are discussed. 相似文献
42.
Birthweight-specific admission rates were reviewed from 1974 to 1982 for Georgia's five regional perinatal centers. Analysis of birthweight-specific neonatal intensive care unit (NICU) admissions as a proportion of total live births revealed an upward trend for infants weighing 1,000 to 1,499 gm and a downward trend for those weighing 2,000 gm or more. This method revealed no significant trends for infants of weight groups less than 500 gm or 500 to 999 gm. Analysis of birthweight-specific admissions as a proportion of total NICU admissions revealed significant increases for all birthweight groups of less than 2,000 gm, with decreases in admissions for infants weighing more than 2,000 gm. Analysis of mortality data revealed improved survival for infants weighing less than 1,500 gm, but some centers showed increases in neonatal mortality, postneonatal mortality, or infant mortality among infants weighing 2,500 gm or more. During this study, low birthweight infants comprised an increasingly larger proportion of neonatal intensive care admissions. This trend evolved gradually through the process of regionalization and can be directly linked to the cost requirements of regional neonatal intensive care units. 相似文献
43.
Bernard Stuart Declan Fox Harry Murphy Bryan Lynch J. Loftus E. Naughten I. Saul O. Sheil N. Duignan A. Jackson W. A. Gorman G. Fox T. Matthews T. Clarke Mark M. Reid H. L. Halliday B. G. McClure P. S. Thomas Michael O’Dowd Michael J. O’Dowd Kevin Connolly F. Leahy Dr. R. G. White Ruth Connolly Colm O’Herlihy Alicja Radic Dr. 《Irish journal of medical science》1986,155(6):209-212
44.
Choice of a childbirth method after cesarean 总被引:1,自引:0,他引:1
Concern about the rising cesarean-section rate and the high percentage of elective repeat cesareans led to an exploratory, retrospective examination of women's decision-making about a childbirth method after cesarean. Fifty women who had delivered by a repeat cesarean (RC) or vaginal birth after cesarean (VBAC) participated in a telephone interview. Three questions were addressed: (1) who made the decision for a birth method; (2) what factors were associated with the choice of method; and (3) was the choice of method associated with the actual method of delivery? The majority of women (90%) perceived that they were the primary decision-maker for a birth method, and choice of birth method was positively associated with actual method of delivery. The major reason for VBAC choice was to experience a vaginal birth, whereas the primary reason for RC choice was to avoid an unsuccessful labor. Other factors associated with choice of a birth method were: sources of information and support, beliefs, previous cesarean experience and locus of control. These findings have important implications for enhancing women's health-care decision-making, as well as for reducing the rate of repeat-cesarean deliveries. 相似文献
45.
46.
Margaret A Chen Timothy R Lander Claire Murphy 《Otolaryngology--head and neck surgery》2006,134(5):741-745
OBJECTIVE: To investigate peripheral nasal pathology as a contributor to olfactory impairment in DS. STUDY DESIGN: Twenty DS and 16 non-DS subjects were recruited. Nasal history and symptoms were assessed by self-report or informant. Olfactory threshold, odor identification, and nasal endoscopy were assessed on each subject. RESULTS: DS subjects were impaired on olfactory threshold (P<0.0001) and odor identification (P<0.001). Although DS subjects tended toward upper-respiratory infections, sleep-disordered breathing, and nasal itching, differences were not significant (P=0.07, 0.06, and 0.058, respectively). There were no significant differences on self-reported nasal history or symptoms. Endoscopy showed equivalent health in DS and control subjects. CONCLUSION: This DS population shows olfactory impairment. However, nasal health is comparable in DS subjects and controls. Nasal dysfunction is unlikely to contribute to olfactory impairment in DS. SIGNIFICANCE: Olfactory deficits in DS appear to be secondary to central, rather than rhinologic, pathology. EBM rating: B-2b. 相似文献
47.
The relation of dizziness to functional decline 总被引:2,自引:0,他引:2
C Boult J Murphy P Sloane V Mor C Drone 《Journal of the American Geriatrics Society》1991,39(9):858-861
OBJECTIVE: to assess the effect of dizziness on the probability that an older person will die or become functionally disabled within 2 years. Dizziness is a common symptom for which the prognosis is uncertain. This report compares the prognoses for dizzy and not-dizzy older people in order to assist clinicians who diagnose and treat these patients. DESIGN: a prospective study of a representative sample of elderly (70+) non-institutionalized Americans. Elderly subjects (n = 3,798) in the Longitudinal Study of Aging (LSOA) were asked questions about the presence of dizziness, medical conditions, and functional disability in 1984. The cohort was reinterviewed about functional disability in 1986. OUTCOME MEASURE: transition from functional ability to disability after 2 years. RESULTS: Bivariate analyses showed that dizziness predicts functional decline but not mortality. Multivariate models revealed that age, race, sensory impairment, vascular disease, and other morbidity are independent predictors of becoming disabled. Controlling for these potential confounders, dizziness does not predict an increased probability of becoming disabled. CONCLUSION: Elderly people who are dizzy should be evaluated for the presence of these related conditions. 相似文献
48.
The current study evaluated psychosocial variables that may contribute to the experience of headache in college adults. One hundred ninety-nine participants, 103 women and 96 men, completed head pain logs for 4 weeks after completing measures assessing psychosocial variables. Multiple regression analyses indicated that level of emotional functioning, perception of stress, and gender were predictive of future headache frequency, intensity, and duration. Family history and health habits did not predict headache activity. These findings are consistent with research investigating psychosocial variables and headache activity. 相似文献
49.
Growth and invasion of human melanomas in human skin grafted to immunodeficient mice. 总被引:8,自引:3,他引:5 下载免费PDF全文
I. Juhasz S. M. Albelda D. E. Elder G. F. Murphy K. Adachi D. Herlyn I. T. Valyi-Nagy M. Herlyn 《The American journal of pathology》1993,143(2):528-537
An orthotopic model of human melanoma was developed in which malignant cells were injected into human skin grafted to nude and SCID mice. Melanoma cells proliferated and invaded the human skin grafts with characteristic patterns. Three of six melanomas grew as multiple nodules and infiltered the grafts without major architectural changes in the dermis, whereas the others invaded the dermis along collagen fibers with prominent endothelial vessels. By contrast, melanoma cells inoculated into mouse skin grew as diffusely expanding nodules that did not invade the murine dermis. In human skin grafts, human melanoma cells were angiogenic for human blood vessels, and murine vessels were only found at the periphery of grafts. Tumor cells invaded the human vessels, and four out of seven cell lines metastasized to lungs, suggesting that this model is useful to determine in vivo the interactions between normal and malignant human cells. 相似文献
50.
Jin S. Lee Herman I. Libshitz William K. Murphy Diane Jeffries Waun K. Hong 《Investigational new drugs》1990,8(3):299-304
Summary Thirty-one patients with stage IIIB or IV non-small cell lung cancer (NSCLC) were treated with intravenous 10-EdAM on a weekly basis. The starting dose was 80 mg/m2, with subsequent doses adjusted depending on evidence of toxicity. There were 20 men and 11 women with a median age of 58 years (range, 33–75). Response was evaluated in 30 patients, 5 with evaluable but not measurable tumors and 25 with measurable indicator lesions. There were no complete remissions; 3 patients achieved partial remission. Nine patients had a minor response, 6 showed no change, and 12 had progressive disease. Median survival for all 31 patients was 43 weeks (range, 12–65+). During the first 3-week period, the 10-EdAM dose was reduced or withheld in 19 patients (because of stomatitis in 12, SGPT elevation in 3, skin rash in 2, and granulocytopenia in 2), escalated in 11 patients, and unchanged in 1 patient. A mean of 34–88 mg/m2of 10-EdAM (median, 50) was given per week during the first 5-week period. Myelotoxicity was infrequent and there was no significant nephrotoxicity. Considering the modest side effects of this treatment and the conservative dose-modification schedule which mandated substantial dose reductions, we conclude that 10-EdAM is a promising antitumor agent for NSCLC. 相似文献