全文获取类型
收费全文 | 2517篇 |
免费 | 237篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 87篇 |
妇产科学 | 76篇 |
基础医学 | 409篇 |
口腔科学 | 23篇 |
临床医学 | 276篇 |
内科学 | 485篇 |
皮肤病学 | 39篇 |
神经病学 | 308篇 |
特种医学 | 37篇 |
外科学 | 243篇 |
综合类 | 17篇 |
一般理论 | 8篇 |
预防医学 | 405篇 |
眼科学 | 29篇 |
药学 | 155篇 |
中国医学 | 7篇 |
肿瘤学 | 141篇 |
出版年
2024年 | 8篇 |
2023年 | 49篇 |
2022年 | 69篇 |
2021年 | 176篇 |
2020年 | 88篇 |
2019年 | 144篇 |
2018年 | 137篇 |
2017年 | 102篇 |
2016年 | 103篇 |
2015年 | 78篇 |
2014年 | 115篇 |
2013年 | 155篇 |
2012年 | 202篇 |
2011年 | 183篇 |
2010年 | 81篇 |
2009年 | 111篇 |
2008年 | 134篇 |
2007年 | 161篇 |
2006年 | 121篇 |
2005年 | 113篇 |
2004年 | 107篇 |
2003年 | 82篇 |
2002年 | 65篇 |
2001年 | 12篇 |
2000年 | 15篇 |
1999年 | 9篇 |
1998年 | 17篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 9篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1984年 | 5篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1970年 | 3篇 |
1969年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有2758条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Ronald B. George Abigail H. Melnick Erin C. Rose Ashraf S. Habib 《Journal canadien d'anesthésie》2007,54(3):218-222
PURPOSE: To report the use of regional anesthesia and iv nitroglycerin to provide anesthesia and uterine relaxation for three Cesarean deliveries (CD) involving ex utero intrapartum treatment (EXIT) of potentially life-threatening airway obstruction in the newborn. CLINICAL FEATURES: Case 1--a 36-yr-old woman at 38 weeks' gestation was scheduled for an elective CD for fetal skeletal dysplasia and micrognathia. Case 2--a 34-yr-old woman at 35 weeks gestation had a fetal ultrasound revealing fixed neck flexion and micrognathia consistent with fetal arthrogryposis. Case 3--a 27-yr-old woman presented at 38 weeks gestation for CD for severe fetal micrognathia, with mandibular growth below the fifth percentile. For each case, a combined spinal epidural anesthetic was performed with 0.75% bupivacaine, fentanyl and morphine intrathecally followed by placement of a multiorifice epidural catheter. Prior to uterine incision patients received a loading dose followed by an iv infusion of nitroglycerin. Uterine relaxation was sufficient in all cases for delivery of the fetus, and allowed for evaluation by direct laryngoscopy and intubation while maintaining fetal-placental circulation. The surgical procedures were completed without incident. CONCLUSIONS: Anesthesia and uterine relaxation for CD and EXIT procedures can be safely provided with regional anesthesia and iv nitroglycerin. 相似文献
6.
7.
BACKGROUND: It has been established that individuals who score high on measures of psychopathy demonstrate difficulty when performing tasks requiring the interpretation of other's emotional states. The aim of this study was to elucidate the relation of emotion and cognition to individual differences on a standard psychopathy personality inventory (PPI) among a nonpsychiatric population. METHODS: Twenty participants completed the PPI. Following survey completion, a mean split of their scores on the emotional-interpersonal factor was performed, and participants were placed into a high or low group. Functional magnetic resonance imaging data were collected while participants performed a recognition task that required attention be given to either the affect or identity of target stimuli. RESULTS: No significant behavioral differences were found. In response to the affect recognition task, significant differences between high- and low-scoring subjects were observed in several subregions of the frontal cortex, as well as the amygdala. No significant differences were found between the groups in response to the identity recognition condition. CONCLUSIONS: Results indicate that participants scoring high on the PPI, although not behaviorally distinct, demonstrate a significantly different pattern of neural activity (as measured by blood oxygen level-dependent contrast)in response to tasks that require affective processing. The results suggest a unique neural signature associated with personality differences in a nonpsychiatric population. 相似文献
8.
9.
Mary Agnes Kendra Ph.D. R.N. C.N.S. Aloise Weiker B.S.N. R.N. Susan Simon B.S.N. M.A. Abigail Grant M.S.W. LISW Diane Shullick B.S.N. R.N. 《Public health nursing (Boston, Mass.)》1996,13(2):83-89
Abstract Factors influencing the remarkable growth of home health care include increased elderly population, decreased average length of hospital stay, and technological advancements that reduce the need for hospitalization. Societal changes have prompted increasing concern about personal risk to home care providers. The purpose of this pilot study was to: 1) ascertain factors related to perception of risk by home health care administrators and staff and to identify strategies used by home health care administrators to reduce risk to staff; and 2) determine whether quality of care is affected when home-visit situations present risk. A convenience sample of 36 home health care administrators and 62 staff was surveyed about risks and measures provided by the home health care agency to minimize risk. Factors associated with risk are geographic location, high incidence of crime, inappropriate patient or caregiver behavior, infectious diseases, and evening assignments. Strategies used to minimize risk include safety programs, preplanning of visits, personal protective equipment, escorts, and buddy systems. Perceived ability to refuse high-risk assignments, however, is questionable, as 66% of the staff stated that they leave a situation "as soon as possible." These findings will be used to strengthen inservice programs and to provide a basis for future studies. 相似文献
10.
Rosario Ceballo Jennifer E. Lansford Antonia Abbey Abigail J. Stewart 《Family relations》2004,53(1):38-48
This study compares the experience of gaining a child through birth, adoption, or marriage, extending the focus of investigation beyond biological parenthood and the transition made by first‐time parents. Using a subsample from the National Survey of Families and Households (N = 204), we compared reasons for having children, parental well‐being, family relationships, and work roles among parents who gained a child biologically, through adoption, or by becoming a stepparent. Overall, there were many similarities in the impact of gaining a child across the three parental groups. Repeated measures analyses of covariance showed that across family groups, after gaining a child, respondents reported less depressed affect, more disagreements with their spouse, and more support from their own parents. The differences across groups suggest that the experience of becoming an adoptive parent or a stepparent may be less stressful than the adjustment to biological parenthood. 相似文献