全文获取类型
收费全文 | 499篇 |
免费 | 27篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 28篇 |
妇产科学 | 3篇 |
基础医学 | 64篇 |
口腔科学 | 2篇 |
临床医学 | 56篇 |
内科学 | 82篇 |
皮肤病学 | 7篇 |
神经病学 | 8篇 |
特种医学 | 132篇 |
外科学 | 23篇 |
综合类 | 51篇 |
预防医学 | 37篇 |
眼科学 | 2篇 |
药学 | 24篇 |
中国医学 | 3篇 |
肿瘤学 | 17篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 3篇 |
2016年 | 7篇 |
2015年 | 12篇 |
2014年 | 13篇 |
2013年 | 23篇 |
2012年 | 17篇 |
2011年 | 11篇 |
2010年 | 14篇 |
2009年 | 20篇 |
2008年 | 16篇 |
2007年 | 23篇 |
2006年 | 14篇 |
2005年 | 11篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 8篇 |
2001年 | 11篇 |
2000年 | 4篇 |
1999年 | 10篇 |
1998年 | 41篇 |
1997年 | 34篇 |
1996年 | 18篇 |
1995年 | 13篇 |
1994年 | 16篇 |
1993年 | 16篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 13篇 |
1989年 | 12篇 |
1988年 | 13篇 |
1987年 | 12篇 |
1986年 | 12篇 |
1985年 | 16篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 9篇 |
1978年 | 9篇 |
1977年 | 7篇 |
1976年 | 4篇 |
1975年 | 3篇 |
排序方式: 共有540条查询结果,搜索用时 15 毫秒
81.
82.
83.
目的:测定炎痛净乳膏中双氯芬酸钠和苯佐卡因的含量。方法:高效液想象以谱法,甲醇为提取溶剂,地西泮为内标,No-va-PakC18色谱柱,甲醇-水-冰醋酸(80:20:0.5)为流动相,检测波长为283nm。结果:双氯芬酸钠和苯佐卡因在5μg/ml-40μg/ml范围内,其浓度与峰面积均呈良好的线性关系(r=0.9999),平均回收率分别为101.0%,RSD=1.21%,99.8%,RSD=0.62%。结论:本法专属性强,操作简便,结果准确。 相似文献
84.
Observations of considerable numbers of Anopheles ziemanni Grunberg resting inside human dwellings in Ahero, western Kenya, raised the question of its status in malaria transmission. To address this question, samples of this species were tested for Plasmodium falciparum infection rates and blood-feeding pattern, and data were compared with those of known vectors in the area. Although no An. ziemanni mosquitoes were infected with P. falciparum sporozoites, the proportions of this mosquito species among all anophelines captured and its human blood index compared well with those of other vectors, suggesting a possible role in the transmission of malaria. Additional studies, including both indoor- and outdoor-resting mosquito populations as well as incorporating laboratory-based parasite susceptibility tests should clarify the situation. 相似文献
85.
Edwin Kamau Paul R. Allyn Omer E. Beaird Kevin W. Ward Nancy Kwan Omai B. Garner Shangxin Yang 《Emerging infectious diseases》2021,27(8):2215
We describe a case of endogenous endophthalmitis caused by sequence type 66-K2 hypervirulent Klebsiella pneumoniae in a diabetic patient with no travel history outside the United States. Genomic analysis showed the pathogen has remained highly conserved, retaining >98% genetic similarity to the original strain described in Indonesia in 1935. 相似文献
86.
Adeladza Kofi Amegah Jouni JK Jaakkola 《Bulletin of the World Health Organization》2016,94(3):215-221
Globally, 41% of households, over 2.8 billion people, rely on solid fuels (coal and biomass) for cooking and heating. In developing countries in Asia and sub-Saharan Africa where these fuels are predominantly used, women who are customarily responsible for cooking, and their young children, are most exposed to the resulting air pollution. Solid fuels are still in widespread use and it appears that intervention efforts are not keeping pace with population growth in developing countries. Here we pinpoint the challenges and identify opportunities for addressing household air pollution while mitigating global climate change and promoting the sustainable development goals. We recommend the following actions: implementation of the WHO indoor air quality guidelines
on household fuel combustion; effective promotion and dissemination of improved cookstoves through formation of country alliances for clean cookstoves; expansion of liquefied petroleum gas production facilities and distribution networks; harnessing renewable energy potential; promotion of biogas production at both household and community level; ensuring improved ventilation of homes through education and enforcement of building standards; and exploiting opportunities in the health and other sectors for changing health-damaging cooking behaviour. 相似文献
87.
Cleft lip and palate (CLP) is one of the commonest congenital malformations and although the aetiology is still very unclear, a familial genetic component is considered to be an important factor in certain individuals. Molecular biology techniques are being used to identify the genes involved and this paper reviews current knowledge and the advances that have already been made. Recent evidence suggests a potential major gene on 6p, and a modifying role for transforming growth factor alpha (TGFA). Moreover retinoic acid receptor alpha (RARA) (17q), MSXl (4p), 4q and BCL3 (19q) could all be implicated in certain CLP families. In addition, the potential modifying role of various genes with the environment are considered to be important areas of research in the future. The identification of a genetic locus associated with this disease would be an important advance in CLP genetic counselling and lead to a better understanding of the genetic basis of CLP. 相似文献
88.
Samuel K. Mutiga J. Musembi Mutuku Vincent Koskei James Kamau Gitau Fredrick Nganga Joyce Musyoka George N. Cheminingwa Rosemary Murori 《Toxins》2021,13(3)
Multiple mycotoxins were tested in milled rice samples (n = 200) from traders at different milling points within the Mwea Irrigation Scheme in Kenya. Traders provided the names of the cultivar, village where paddy was cultivated, sampling locality, miller, and month of paddy harvest between 2018 and 2019. Aflatoxin, citrinin, fumonisin, ochratoxin A, diacetoxyscirpenol, T2, HT2, and sterigmatocystin were analyzed using ultra-high-performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS). Deoxynivalenol was tested using enzyme-linked immunosorbent assay (ELISA). Mycotoxins occurred in ranges and frequencies in the following order: sterigmatocystin (0–7 ppb; 74.5%), aflatoxin (0–993 ppb; 55.5%), citrinin (0–9 ppb; 55.5%), ochratoxin A (0–110 ppb; 30%), fumonisin (0–76 ppb; 26%), diacetoxyscirpenol (0–24 ppb; 20.5%), and combined HT2 + T2 (0–62 ppb; 14.5%), and deoxynivalenol was detected in only one sample at 510 ppb. Overall, low amounts of toxins were observed in rice with a low frequency of samples above the regulatory limits for aflatoxin, 13.5%; ochratoxin A, 6%; and HT2 + T2, 0.5%. The maximum co-contamination was for 3.5% samples with six toxins in different combinations. The rice cultivar, paddy environment, time of harvest, and millers influenced the occurrence of different mycotoxins. There is a need to establish integrated approaches for the mitigation of mycotoxin accumulation in the Kenyan rice. 相似文献
89.
Shinpei Yoshii Shigeru Hosaka Shoji Suzuki Wataru Takahashi Hideto Okuwaki Hiroshi Osawa Samuel JK Abraham Yusuke Tada 《The Japanese Journal of Thoracic and Cardiovascular Surgery》2001,49(5):279-281
OBJECTIVE: Despite the many procedures introduced to prevent surgical site infection during cardiothoracic surgery, serious infections still occur. We attempted to reduce surgical site infection by spraying antibiotic solution in the operative field--a procedure since introduced at 4 other Japanese institutions. METHODS: In the latter half of 1990, we began spraying an antibiotic solution of cefazolin (1g) and gentamicin (40 mg)/40 ml of saline placed in a 50 ml syringe and dispensed through an 18 G needle bent at 60 to 80 degrees to clean the wound during surgery. RESULT: No deep surgical site infections or deaths due to infection have occurred among the 502 patients undergoing cardiothoracic surgery under cardiopulmonary bypass at our hospital. This method was used in over 2,100 cases of similar procedures at 4 other institutions. There were 3 deaths due to severe surgical site infection (0.11%). At one institution treating over 1,000 cases a year, the incidence of death due to surgical site infection decreased significantly after this method was introduced. CONCLUSION: These preliminary experiences show that spraying antibiotic solution in the operative field reduces the risk of surgical site infection in cardiothoracic surgery. 相似文献
90.
MJ Krimholtz MRCP S Thomas MRCP J Bingham FRCR JK Powrie FRCP 《International journal of clinical practice》2001,55(5):339-340
Lymphocytic hypophysitis is an uncommon condition that typically occurs during the last trimester of pregnancy or in the postpartum period. Presentation is of an anterior pituitary mass with varying degrees of pituitary dysfunction. We present a case in which there was dramatic resolution of the pituitary lesion on sequential MRI scanning. Despite this apparent resolution, however, the patient continues to have significant pituitary dysfunction. 相似文献