全文获取类型
收费全文 | 2394篇 |
免费 | 144篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 52篇 |
儿科学 | 151篇 |
妇产科学 | 18篇 |
基础医学 | 220篇 |
口腔科学 | 42篇 |
临床医学 | 127篇 |
内科学 | 582篇 |
皮肤病学 | 43篇 |
神经病学 | 92篇 |
特种医学 | 133篇 |
外科学 | 433篇 |
综合类 | 49篇 |
一般理论 | 1篇 |
预防医学 | 66篇 |
眼科学 | 128篇 |
药学 | 218篇 |
中国医学 | 10篇 |
肿瘤学 | 181篇 |
出版年
2023年 | 21篇 |
2022年 | 42篇 |
2021年 | 108篇 |
2020年 | 88篇 |
2019年 | 89篇 |
2018年 | 112篇 |
2017年 | 75篇 |
2016年 | 108篇 |
2015年 | 98篇 |
2014年 | 148篇 |
2013年 | 160篇 |
2012年 | 241篇 |
2011年 | 230篇 |
2010年 | 118篇 |
2009年 | 93篇 |
2008年 | 141篇 |
2007年 | 146篇 |
2006年 | 105篇 |
2005年 | 112篇 |
2004年 | 88篇 |
2003年 | 82篇 |
2002年 | 57篇 |
2001年 | 11篇 |
2000年 | 8篇 |
1999年 | 13篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 7篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有2546条查询结果,搜索用时 31 毫秒
991.
992.
993.
994.
995.
996.
997.
Voriconazole is a newer systemic antifungal agent effective against Candida and Aspergillus. There are few reports of its safe use in newborns. We report the first case series of safe Voriconazole use in critically ill newborns with cardiac disease along with several other cardiac drugs without any significant drug interaction or side-effect. 相似文献
998.
Mayhew M Hansen PM Peters DH Edward A Singh LP Dwivedi V Mashkoor A Burnham G 《American journal of public health》2008,98(10):1849-1856
Objectives. We sought to identify characteristics associated
with use of skilled birth attendants where health services exist in Afghanistan.Methods. We conducted a cross-sectional study in all 33
provinces in 2004, yielding data from 617 health facilities and 9917 women who
lived near the facilities and had given birth in the past 2 years.Results. Only 13% of respondents had used skilled birth
attendants. Women from the wealthiest quintile (vs the poorest quintile) had
higher odds of use (odds ratio [OR] = 6.3; 95% confidence interval
[CI] = 4.4, 8.9). Literacy was strongly associated with use (OR
= 2.5; 95% CI = 2.0, 3.2), as was living less than 60
minutes from the facility (OR = 1.5; 95% CI = 1.1, 2.0)
and residing near a facility with a female midwife or doctor (OR =
1.4; 95% CI = 1.1, 1.8). Women living near facilities that charged
user fees (OR = 0.8; 95% CI = 0.6, 1.0) and that had male
community health workers (OR = 0.6; 95% CI = 0.5, 0.9) had
lower odds of use.Conclusions. In Afghanistan, the rate of use of safe delivery
care must be improved. The financial barriers of poor and uneducated women
should be reduced and culturally acceptable alternatives must be considered.Reduction of maternal and neonatal mortality are global priorities that are particularly
relevant in Afghanistan, where the maternal mortality ratio (1600 per 100 000 live
births) is one of the highest in the world.1 Reliable estimates for neonatal mortality in Afghanistan do not exist, but
available evidence indicates that 74% of infants born to women who died of maternal
causes also died.1 Causes of maternal death in Afghanistan include hemorrhage, obstructed labor,
sepsis, pregnancy-induced hypertension, and indirect causes—diseases that
reduce resilience of pregnant women—such as tuberculosis, malnutrition, and malaria.1 Neonatal deaths in developing countries are caused by prematurity, congenital
anomalies, birth asphyxia, and infections.2Increasing the proportion of births assisted by skilled birth
attendants—doctors, nurses, or midwives trained in safe care during
delivery—is a central strategy for improving maternal and child health in
Afghanistan. If 80% of pregnant Afghan women were assisted by skilled birth attendants,
an estimated 10 000 maternal deaths and 40 000 neonatal deaths would have been prevented
in 2002.1,3–5Several barriers to utilization of health services contribute to Afghanistan''s
high maternal mortality; these include decisionmaking processes related to care seeking,
availability of skilled female health workers and supplies, and other geographical,
financial, and cultural factors.1,6 In 2002, Afghanistan''s health
care system, destroyed after 25 years of conflict, had few trained health workers and
little remaining infrastructure.7,8 The lifetime risk of maternal death
for women was 1 in 9; 78% of maternal deaths were from causes that could have been
prevented had adequate obstetrical care been received.1,3 At that
time, only 9% of women were assisted by a skilled birth attendant, 8% of women received
antenatal care, 10% of hospitals provided caesarean sections, and one third of women
were vaccinated against tetanus.7,9Challenges to health care provision are compounded by the fact that 77% of Afghans live
in sparsely populated areas separated by large expanses of difficult terrain and poor
transportation infrastructure.3 For women in some remote areas, more than 2 weeks of travel time is required to
access a skilled birth attendant1,10; this is important because both
infant and maternal deaths have been found to vary with distance from urban
centers.1,9,11Use of skilled birth attendants is a central part of the Basic Package of Health Services
(BPHS), a set of essential health services designed by the Afghan Ministry of Public
Health to be provided to all Afghans. The BPHS addresses maternal and newborn health,
child health and immunizations, nutrition, tuberculosis, malaria, mental health,
disabilities, and the supply of essential medicines.12 We sought to assess the extent to which women residing in facility catchment
areas in Afghanistan use skilled birth attendants and to identify the household,
community, and health facility characteristics associated with skilled birth attendant
use, in the hopes of informing maternal health programs and policies. We conducted our
study in 2004 among households residing in the catchment areas of facilities
implementing the BPHS, defined as within a 90-minute walking distance from the facility. 相似文献
999.
Improved tumor destruction with arsenic trioxide and radiofrequency ablation in three animal models 总被引:2,自引:0,他引:2
PURPOSE: To assess the extent of tumor blood flow reduction that is achievable with arsenic trioxide (As2O3) and the effect of As2O3 on radiofrequency (RF)-induced coagulation. MATERIALS AND METHODS: All animal protocols and experiments were approved by an institutional animal care and use committee before the start of the study. Experiments were conducted in three tumor models: intrarenal VX2 sarcoma in 27 rabbits, RCC 786-0 human renal cell carcinoma in 24 nude mice, and R3230 mammary adenocarcinoma in 40 rats. One dose (0-7.5 mg per kilogram of body weight) of As2O3 was administered (intraperitoneally in rodents, intravenously in rabbits) 1, 6, or 24 hours before standardized RF ablation, which was performed by using a 1-cm active tip, with mean temperatures of 70 degrees C +/- 2 (standard deviation) for 5 minutes in rodents and 90 degrees C +/- 2 for 6 minutes in rabbits. Laser Doppler flowmetry was used to quantify changes in blood flow, which were compared with diameters of induced tumor coagulation. Comparisons between groups were performed by using Student t tests or analysis of variance. The strengths of correlations between As2O3, tumor blood flow, and RF-induced coagulation were assessed by using linear and higher-order regression models and reported as R2 computations. RESULTS: Administration of As2O3 significantly (P < .05) reduced blood flow and increased tumor destruction in all tumor models. In VX2 sarcoma tumors, 1 mg/kg As2O3 reduced mean tumor blood flow to 46% +/- 13 of the normal value. The mean resultant coagulation (1.1 cm +/- 0.1) was significantly greater than that achieved with RF ablation alone (0.6 cm +/- 0.1, P < .01). In RCC 786-0 and R3230 tumors, 5 mg/kg As2O3 reduced mean tumor blood flow to 57% +/- 6 and 46% +/- 6 of normal, respectively, increasing mean ablation extent to 0.8 cm +/- 0.1 for both models, compared with those achieved with the control treatment (0.6 cm +/- 0.1 and 0.5 cm +/- 0.1, respectively; P < .05 for both comparisons). Dose studies revealed correlations between drug dose, tumor blood flow, and RF-induced coagulation in all three tumor models (R2 = 0.60-0.79). Maximal RF synergy was observed 1 hour after As2O3 administration. CONCLUSION: As2O3 administration represents a transient noninvasive method of reducing tumor blood flow during RF ablation, enabling larger zones of tumor destruction in multiple tumor models. 相似文献
1000.
We report an unusual case of a 10-year-old female with complaints of pain and swelling of the right knee for the last 4 years along with the limitation of movement for last 1 year. Repeated fine needle aspirations yielded blood and a provisional diagnosis of hemarthrosis was suggested. Coagulation profile subsequently carried out was found to be within normal limits. Arthroscopic biopsy was performed and tissue was sent for histopathological examination. A diagnosis of synovial hemangioma was made. Subtotal synovectomy was performed and the lesion was completely excised. The patient is completely asymptomatic and shows no signs of recurrence at 1 year. 相似文献