全文获取类型
收费全文 | 1759篇 |
免费 | 329篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 58篇 |
妇产科学 | 281篇 |
基础医学 | 77篇 |
口腔科学 | 33篇 |
临床医学 | 849篇 |
内科学 | 178篇 |
皮肤病学 | 52篇 |
神经病学 | 14篇 |
特种医学 | 235篇 |
外科学 | 66篇 |
综合类 | 57篇 |
预防医学 | 90篇 |
眼科学 | 5篇 |
药学 | 45篇 |
肿瘤学 | 53篇 |
出版年
2024年 | 6篇 |
2023年 | 44篇 |
2022年 | 3篇 |
2021年 | 9篇 |
2020年 | 35篇 |
2019年 | 19篇 |
2018年 | 58篇 |
2017年 | 93篇 |
2016年 | 77篇 |
2015年 | 100篇 |
2014年 | 106篇 |
2013年 | 99篇 |
2012年 | 38篇 |
2011年 | 63篇 |
2010年 | 101篇 |
2009年 | 101篇 |
2008年 | 43篇 |
2007年 | 45篇 |
2006年 | 37篇 |
2005年 | 24篇 |
2004年 | 17篇 |
2003年 | 29篇 |
2002年 | 20篇 |
2001年 | 34篇 |
2000年 | 10篇 |
1999年 | 47篇 |
1998年 | 93篇 |
1997年 | 109篇 |
1996年 | 105篇 |
1995年 | 93篇 |
1994年 | 63篇 |
1993年 | 49篇 |
1992年 | 22篇 |
1991年 | 23篇 |
1990年 | 9篇 |
1989年 | 32篇 |
1988年 | 31篇 |
1987年 | 18篇 |
1986年 | 26篇 |
1985年 | 29篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 18篇 |
1981年 | 12篇 |
1980年 | 15篇 |
1979年 | 4篇 |
1978年 | 16篇 |
1977年 | 16篇 |
1976年 | 13篇 |
1975年 | 13篇 |
排序方式: 共有2096条查询结果,搜索用时 15 毫秒
11.
Jane Sandall RM RN MSc PhD Declan Devane RM Hora Soltani RM MMedSci PhD Marie Hatem RM PhD Simon Gates PhD 《Journal of Midwifery & Women's Health》2010,55(3):255-261
This article draws on findings from a recent Cochrane systematic review of midwife‐led care and discusses its contribution to the safety and quality of women's care in the domains of safety, effectiveness, woman‐centeredness, and efficiency. According to the Cochrane review, women who received models of midwife‐led care were nearly eight times more likely to be attended at birth by a known midwife, were 21% less likely to experience fetal loss before 24 weeks' gestation, 19% less likely to have regional analgesia, 14% less likely to have instrumental birth, 18% less likely to have an episiotomy, and significantly more likely to have a spontaneous vaginal birth, initiate breastfeeding, and feel in control. In addition to normalizing and humanizing birth, the contribution of midwife‐led care to the quality and safety of health care is substantial. The implications are that policymakers who wish to improve the quality and safety of maternal and infant care, particularly around normalizing and humanizing birth, should consider midwife‐led models of care and how financing of midwife‐led services can support this. Suggestions for future research include exploring why fetal loss is reduced under 24 weeks' gestation in midwife‐led models of care, and ensuring that the effectiveness of midwife‐led models of care on mothers' and infants' health and well‐being are assessed in the longer postpartum period. 相似文献
12.
Abstract: Background: In many hospitals in former Soviet countries, traditional Soviet perinatal policies remain in place, although in others reforms have been introduced. This study explores women’s experiences during labor and birth in two Lithuanian maternity hospitals. The hospitals differed in that one (S) followed traditional Soviet era maternity practices whereas the other (P) had been exposed to World Health Organization‐Euro practices and policies with respect to more up‐to‐date evidence‐based and family‐centered care. Methods: Consecutive women giving birth in the two maternity hospitals were asked to participate in a survey. Completed responses were obtained from 416 women in one hospital (P) and 304 in the other hospital (S) representing 92.4 and 67.5 percent response rates, respectively. Results: Rates of interventions in both hospitals were similarly high with, however, P hospital being more likely to be sensitive to women’s psychosocial needs, such as being allowed to eat and drink more often during labor, and to have their husband or partner with them for labor and birth. Conclusion: It appears that in Lithuania, as in many parts of the world, introducing changes to the clinical care of birth takes time, and psychosocial changes may be easier to introduce than alterations in clinical practice. (BIRTH 37:2 June 2010) 相似文献
13.
Abstract: Background: The media both creates and reflects public opinion. The way in which health professionals are depicted in the media is likely to influence views held by and about different health professions. The aim of this study was to examine how midwives and obstetricians are reported in English language web-based news reports from around the world. Methods: News alerts from the Internet search engine Google were created to search for the terms “midwife,”“midwives,”“midwifery,”“obstetrics,” and “obstetricians.” These alerts were received over a 12-month period (May 1, 2006–April 31, 2007), downloaded, and analyzed using quantitative content analysis. Results: A total of 522 web-based news reports for midwifery and 564 for obstetrics (n = 1,086) were found. Dominant categories for midwives were: “mainstreaming midwives” (models of care/rise of midwifery) (28%); “the Cinderella of the maternity care” (workforce/industrial) (27%); “delivering the baby with your hands tied” (funding, insurance, and legislation) (21%); “ask the expert” (education, research, and health advice) (8%), “recognizing midwives” (awards and announcements) (7%), “unsafe midwives” (litigation) (6%); and “the art of birth” (books, film, and photographs) (2%). Dominant categories for obstetricians were: “ask the expert” (research and advice) (26%); “doctors are heroes amongst us” (awards and announcements) (19%); “obstetric workforce woes” (workforce/industrial) (19%); “new frontiers” (trends in care and new technology) (17%); “the disappearing obstetrician” (insurance and litigation) (10%); and “human-interest news reports” (9%). Obstetricians were more likely to be recognized as experts on pregnancy and birth and receive public recognition compared with midwives. Midwives were more likely to be depicted as struggling to be a mainstream option while being hampered by lack of funding, insurance, and legislative barriers. Conclusions: Although midwives have rising acceptance, they still struggle with recognition. Obstetricians have both acceptance and recognition. Countries where midwifery is a mainstream option have more news reports related to midwifery than obstetrics. Different issues appear more dominant in some countries, such as work force in the United Kingdom and funding, insurance, and legislation in the United States. (BIRTH 39:1 March 2012) 相似文献
14.
Zelinski-Wooten MB; Slayden OD; Chwalisz K; Hess DL; Brenner RM; Stouffer RL 《Human reproduction (Oxford, England)》1998,13(2):259-267
Large doses of antiprogestin typically disrupt menstrual cyclicity. A
chronic low-dose regimen of the potent new antiprogestin ZK 137 316, which
permits continued menstrual cyclicity but alters gonadal- reproductive
tract activity, was established. Rhesus monkeys received vehicle (n = 6) or
0.01 (n = 8), 0.03 (n = 8) or 0.1 (n = 5) mg ZK 137 316/kg body weight
daily for five menstrual cycles (C-1 to C-5). Oestradiol, progesterone and
gonadotrophin profiles were normal during cycles involving vehicle and 0.01
and 0.03 mg ZK 137 316/kg body weight. In the 0.1 mg/kg group, mid-cycle
oestradiol and gonadotrophin surges, and subsequent progesterone
production, were absent in C-3 and C-5. Ovarian cyclicity was accompanied
by timely menstruation in the vehicle and 0.01 mg/kg groups. By C-3, half
the animals in the 0.03 mg/kg group and all animals in the 0.1 mg/kg group
were amenorrhoeic. A corpus luteum was noted during the mid-luteal phase of
C-5 in the vehicle, 0.01 mg/kg and 0.03 mg/kg groups. Large antral and
cystic follicles were evident in the 0.1 mg/kg group. Thus, a daily
treatment with 0.01 mg/kg ZK 136317 permitted normal menstrual cyclicity in
macaques. While the daily administration of 0.03 mg/kg ZK 136 317 allowed
ovarian cyclicity, menstruation was disrupted in some animals. Increasing
the dose to 0.1 mg/kg antagonized pituitary function and resulted in
anovulation and amenorrhoea. A chronic low-dose regimen of the
antiprogestin ZK 137 316, which permits normal ovarian/menstrual cyclicity,
has potential as a contraceptive in women.
相似文献
15.
Gonadotrophin-releasing hormone agonist dose-dependency of pituitary desensitization during controlled ovarian hyperstimulation in IVF 总被引:2,自引:2,他引:2
Janssens RM; Vermeiden JP; Lambalk CB; Schats R; Schoemaker J 《Human reproduction (Oxford, England)》1998,13(9):2386-2391
The aim of this study was to find the minimal effective daily s.c. dose of
the gonadotrophin-releasing hormone (GnRH) agonist, triptorelin acetate,
that suppresses the GnRH-induced release of luteinizing hormone (LH) at
time of human chorionic gonadotrophin (HCG) injection and thereby prevents
spontaneous LH surges during in-vitro fertilization (IVF) stimulation
cycles. Therefore, a double-blind, prospective and randomized titration
study was performed. A total of 48 IVF patients were divided into four
groups of 12 patients. Each group received a different dose of triptorelin
acetate, namely 5, 15, 50 or 100 microg s.c. daily. Standard ovarian
stimulation was carried out using urinary follicle stimulating hormone
(FSH) preparations. A 500 microg GnRH test was performed 90 min before the
HCG injection in order to measure the degree of pituitary desensitization.
Spontaneous LH surges were not detected in any of the groups, although
three patients in the 5 microg group had ovulated at the time of ovum
retrieval. The pituitary LH response to the GnRH test at time of HCG,
expressed as area under the curve (AUC), appeared to be dose-dependent.
Thus, a daily s.c. dose of 100 microg triptorelin acetate appears to be too
high, since adequate desensitization of the pituitary (i.e. no spontaneous
LH surge) can be achieved with doses as low as 15 and 50 microg.
相似文献
16.
B lymphocytes secreting IgG linked to latent transforming growth factor- beta prevent primary cytolytic T lymphocyte responses 总被引:3,自引:0,他引:3
B lymphocytes secreting IgG linked to latent transforming growth factor
(TGF)-beta (IgG-TGF-beta) prevent cytolytic T lymphocyte (CTL) responses to
unrelated antigens in mixed lymphocyte cultures (MLC) so long as resting
resident macrophages and functional Fc receptors are present. This was
shown using IgG-secreting plaque-forming cells (PFC) to sheep erythrocytes
(SRBC) obtained from popliteal lymph nodes of mice injected repeatedly in
foot pads with SRBC. Remarkably, as few as approximately 300 PFC prevented
CTL responses of 5 x 10(5) normal syngeneic spleen cells in MLC.
Supranatants of short-term cultures of PFC also prevented CTL responses,
and suppression was prevented by eliminating or dissociating IgG and
TGF-beta present in supranatants or by antibody against active TGF-beta.
Furthermore, the latency- associated peptide of latent TGF-beta was
detected in approximately 10% of foci of IgG captured from single PFC,
indicating that at least some B lymphocytes secrete IgG-TGF-beta as a
complex. Resting resident macrophages (which do not produce latent
TGF-beta) and functional Fc receptors were required for suppression,
consistent with idea that IgG- TGF-beta is taken up through Fc receptors
for IgG and that active TGF- beta, cleaved from latent TGF-beta of the
complex, is delivered directly to potentially responding CTL. If CTL
responses in man are similarly regulated by B lymphocytes, then an ongoing
B cell response in patients with chronic viral infections or bearing
immunogenic cancers may prevent effective therapeutic vaccination.
相似文献
17.
The Collaboration for Maternal and Newborn Health, a multidisciplinary group of maternity care providers from the University of British Columbia (UBC), received funding from Health Canada to develop interprofessional education programs for health care students. Medical, midwifery, and nursing students from UBC were invited to participate in the three programs described in this article. The Interprofessional Student Doula Support Program, a year‐long program for 15 students, combines classroom learning about marginalized women with on‐call doula support to attend births. The Interprofessional Normal Labour and Birth Workshop is a 5‐hour event, comprised of lectures and hands‐on stations about normal labour, birth, and the immediate postpartum period. The Maternity Care Club Hands‐on Night occurs twice a year, and students gather to practice at maternity care stations in a casual setting. A total of 467 participants over 3 years completed evaluations of their experiences. Students rate these programs very highly in terms of benefits of multidisciplinary collaboration. Providing students with opportunities to engage with other health care disciplines enhances interest in the professions of maternity care and the benefits of collaboration. 相似文献
18.
Successful pregnancy in a transfusion-dependent thalassaemic patient receiving subcutaneous desferrixaomine is reported. This is the first such case to be described. 相似文献
19.
Jurriaan P Oudhoff Danielle RM Timmermans Martin Rietberg Dirk L Knol Gerrit van der Wal 《BMC health services research》2007,7(1):32
Background
Problematic waiting lists in public health care threaten the equity and timeliness of care provision in several countries. This study assesses different stakeholders' views on the acceptability of waiting lists in health care, their preferences for priority care of patients, and their judgements on acceptable waiting times for surgical patients. 相似文献20.
C KAPPAGODA DN SCHELL RM HANSON & P HUTCHINS 《Journal of paediatrics and child health》1998,34(6):508-512