全文获取类型
收费全文 | 1058篇 |
免费 | 67篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 51篇 |
妇产科学 | 28篇 |
基础医学 | 120篇 |
口腔科学 | 12篇 |
临床医学 | 74篇 |
内科学 | 220篇 |
皮肤病学 | 14篇 |
神经病学 | 70篇 |
特种医学 | 16篇 |
外国民族医学 | 1篇 |
外科学 | 175篇 |
综合类 | 9篇 |
预防医学 | 94篇 |
眼科学 | 29篇 |
药学 | 104篇 |
中国医学 | 10篇 |
肿瘤学 | 92篇 |
出版年
2023年 | 9篇 |
2022年 | 19篇 |
2021年 | 53篇 |
2020年 | 21篇 |
2019年 | 39篇 |
2018年 | 44篇 |
2017年 | 20篇 |
2016年 | 33篇 |
2015年 | 54篇 |
2014年 | 68篇 |
2013年 | 57篇 |
2012年 | 84篇 |
2011年 | 78篇 |
2010年 | 43篇 |
2009年 | 45篇 |
2008年 | 73篇 |
2007年 | 70篇 |
2006年 | 65篇 |
2005年 | 51篇 |
2004年 | 39篇 |
2003年 | 35篇 |
2002年 | 18篇 |
2001年 | 5篇 |
2000年 | 12篇 |
1999年 | 4篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1982年 | 2篇 |
1980年 | 6篇 |
1977年 | 2篇 |
1974年 | 3篇 |
1971年 | 2篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有1136条查询结果,搜索用时 828 毫秒
1.
2.
Rubens Souza de OLIVEIRA Lanna Jamile Corrêa da COSTA Fernanda Atanaena Gon?alves de ANDRADE Wilson UIEDA Luzia Fátima Alves MARTORELLI Ana Paula de Arruda Geraldes KATAOKA Elizabeth Salbé Travassos da ROSA Pedro Fernando da Costa VASCONCELOS Armando de Souza PEREIRA Ant?nio Ismael Barros do CARMO Marcus Emanuel Barroncas FERNANDES 《Revista do Instituto de Medicina Tropical de S?o Paulo》2015,57(6):497-503
The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005,
in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a
priority area for studies on this zoonosis. Given this, the present study provides
data on this phenomenon in an urban context, in order to assess the possible
circulation of the classic rabies virus (RABV) among bat species in Capanema, a town
in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and
dry seasons. Samples of brain tissue and blood were collected for virological and
serological survey, respectively. None of the 153 brain tissue samples analyzed
tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum
samples analyzed were seropositive. Artibeus planirostris was the most common
species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31
52.60%). Statistically, equal proportions of seropositive results were obtained in
the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly
higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95%
CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested
positive for infection, the high proportion of seropositive specimens indicates that
RABV may be widespread in this urban area. 相似文献
3.
J-P Lefaucheur J-J Labat G Amarenco A-G Herbaut D Prat-Pradal J Benaim B Aranda M-C Arne-Bes V Bonniaud P-M Boohs K Charvier F Daemgen P Dumas J-P Galaup S Sheikh Ismael J Kerdraon P Lacroix D Lagauche E Lapeyre M Lefort A-M Leroi R-J Opsomer B Parratte J-G Prévinaire P Raibaut J-Y Salle M-C Scheiber-Nogueira J-M Soler M-F Testut C Thomas 《Clinical neurophysiology》2007,37(4):223-228
Entrapment of the pudendal nerve may be at the origin of chronic perineal pain. This syndrome must be diagnosed because this can result in the indication of surgical decompression of the entrapped nerve for pain relief. Electroneuromyographic (ENMG) investigation is often performed in this context, based on needle electromyography and the study of sacral reflex and pudendal nerve motor latencies. The limits of ENMG investigation, owing to various pathophysiological and technical considerations, should be known. The employed techniques do not assess directly the pathophysiological mechanisms of pain but rather correlate to structural alterations of the pudendal nerve (demyelination or axonal loss). In addition, only direct or reflex motor innervation is investigated, whereas sensory nerve conduction studies should be more sensitive to detect nerve compression. Finally, ENMG cannot differentiate entrapment from other causes of pudendal nerve lesion (stretch induced by surgical procedures, obstetrical damage, chronic constipation...). Thus, perineal ENMG has a limited sensitivity and specificity in the diagnosis of pudendal nerve entrapment syndrome and does not give direct information about pain mechanisms. Pudendal neuralgia related to nerve entrapment is mainly suspected on specific clinical features and perineal ENMG examination provides additional, but no definitive clues, for the diagnosis or the localization of the site of compression. In fact, the main value of ENMG is to assess objectively pudendal motor innervation when a surgical decompression is considered. Perineal ENMG might predict the outcome of surgery but is of no value for intraoperative monitoring. 相似文献
4.
William H C Tiong T Ismael J McCann 《Journal of plastic, reconstructive & aesthetic surgery》2006,59(12):1367-1371
Absidia corymbifera infection in a healthy individual is rare. Most of the infection occurs in immunocompromised patients or diabetic patients. Cutaneous and subcutaneous mucormycosis have been increasingly reported in the literature as a result of massive trauma with contaminated wounds. We present a case of cutaneous mucormycosis in a healthy, young patient after surgical amputation for a crush injury of the leg. We also highlight the importance of the high index of clinical suspicion in the diagnosis and treatment of this fungal infection in the hype of methicillin-resistant Staphylococcus aureus (MRSA) infection in hospital setting these days. Despite an initial life-saving amputation, it was inadequate to ensure the eradication of A. corymbifera infection. A second amputation was required with parenteral liposomal amphotericin B to achieve a satisfactory cure. 相似文献
5.
J. Randolph Swartz Ira M. Lesser Kyle B. Boone Bruce L. Miller Ismael Mena 《International journal of geriatric psychiatry》1995,10(6):437-446
Global and regional cerebral blood flow (CBF) were evaluated with single photon emission computerized tomography (SPECT) utilizing both 133Xenon (133Xe) (47 subjects, 47–82 years old) and 99Tc-hexamethylpropyleneamine oxime (99Tc-HMPAO) (27 subjects, 47–80 years old). The 133Xe results showed: among total subjects, no age-related decline in global CBF, but a significant regional decline in the occipital lobe (p < 0.05); among men, significant age-related declines in global, frontal, temporal, occipital and right hemisphere CBF (all p < 0.05); among women, no age-related decline in global or regional CBF. The 99Tc-HMPAO results showed no age-related decline in either global or regional perfusion among total subjects, men or women. These results suggest that age-related global and regional (including frontal lobe) CBF declines do not occur in healthy control subjects after the age of 45 years. However, gender differences in age-related CBF changes warrant further study. 相似文献
6.
Review of imaging techniques for the diagnosis of breast cancer: a new role of prone scintimammography using technetium-99m sestamibi 总被引:6,自引:4,他引:2
Iraj Khalkhali Ismael Mena Linda Diggles 《European journal of nuclear medicine and molecular imaging》1994,21(4):357-362
Imaging techniques currently used for the diagnosis of breast cancer are reviewed and compared. Besides mammography, magnetic resonance imaging, positron emission tomography, and thallium-201 scintimammography, a new role of technetium-99m sestamibi scintimammography is discussed. It is concluded that while mammography remains the procedure of choice in screening asymptomatic women for breast cancer, other imaging methods play an important role in detecting malignancies in symptomatic patients.99mTc-sestamibi scintimammography has high sensitivity and improves the specificity of conventional mammography for the detection of breast cancer; with this technique, prone imaging is preferable to supine imaging.99mTc-sestamibi scintimammography thus deserves further study as a screening technique. 相似文献
7.
Francisco Camacho Juan Ferrando Antonio R. Pichardo Ismael Sotillo Enrique Jorquera 《Pediatric dermatology》1993,10(1):54-57
Abstract: A 20-year-old woman and her 12-year-old brother had hypohidrotic ectodermal dysplasia, cleft lip and palate, midfacial hypoplasia with narrow nose from the nasal bridge to the tip, narrow dysplastic nails, and conical teeth and hypodontia, and hypospadias and hypoplastic uvula in the boy. The woman had major underdevelopment of intellectual capacity. The most important hair anomalies in both siblings were sparse eyebrows, pili torti, and pili canaliculi. Some of the pili canaliculi had two canals (pili bicanaliculi), and the cross section for scanning electron microscopy had a quadrangular aspect. This is the seventh family reported with Rapp-Hodgkin ectodermal dysplasia. 相似文献
8.
Valbuena JR Gualco G Espejo-Plascencia I Medeiros LJ 《Annals of diagnostic pathology》2005,9(1):38-42
We report a case of an 81-year-old immunocompetent Mexican man who underwent an abdominal-perineal rectal resection for a mass clinically thought to be carcinoma. Histopathologic diagnosis revealed classical Hodgkin lymphoma, nodular sclerosis type, involving the rectum. The diagnosis was confirmed by immunohistochemical studies that showed that the neoplastic cells were positive for CD15 and CD30 and negative for CD45 (LCA). In situ hybridization for Epstein-Barr virus small-encoded RNA was also positive in the neoplastic cells. Hodgkin lymphoma arising in the rectum of immunocompetent patients is rare, with only 12 cases (including this one) reported in the literature. Of these, the diagnosis was confirmed by immunohistochemical studies in only two cases, and this is the first case assessed and shown to be positive for Epstein-Barr virus. 相似文献
9.
Guzmán M Sánchez C Galve-Roperh I 《Journal of molecular medicine (Berlin, Germany)》2001,78(11):613-625
Cannabinoids, the active components of Cannabis sativa (marijuana), and their derivatives produce a wide spectrum of central and peripheral effects, some of which may have clinical application. The discovery of specific cannabinoid receptors and a family of endogenous ligands of those receptors has attracted much attention to cannabinoids in recent years. One of the most exciting and promising areas of current cannabinoid research is the ability of these compounds to control the cell survival/death decision. Thus cannabinoids may induce proliferation, growth arrest, or apoptosis in a number of cells, including neurons, lymphocytes, and various transformed neural and nonneural cells. The variation in drug effects may depend on experimental factors such as drug concentration, timing of drug delivery, and type of cell examined. Regarding the central nervous system, most of the experimental evidence indicates that cannabinoids may protect neurons from toxic insults such as glutamaergic overstimulation, ischemia and oxidative damage. In contrast, cannabinoids induce apoptosis of glioma cells in culture and regression of malignant gliomas in vivo. Breast and prostate cancer cells are also sensitive to cannabinoid-induced antiproliferation. Regarding the immune system, low doses of cannabinoids may enhance cell proliferation, whereas high doses of cannabinoids usually induce growth arrest or apoptosis. The neuroprotective effect of cannabinoids may have potential clinical relevance for the treatment of neurodegenerative disorders such as multiple sclerosis, Parkinson's disease, and ischemia/stroke, whereas their growth-inhibiting action on transformed cells might be useful for the management of malignant brain tumors. Ongoing investigation is in search for cannabinoid-based therapeutic strategies devoid of nondesired psychotropic effects. 相似文献
10.
Silvio S. Silva Ismael M. Mancilha Maurício A. Queiroz Maria G. A. Felipe Ines C. Roberto Michele Vitolo 《Journal of basic microbiology》1994,34(3):205-208
The xylose conversion into xylitol by Candida guilliermondii was evaluated in semi-synthetic media supplemented with different nitrogen sources in a ratio C/N equal 25.6. It was noticed that the xylitol yield was around 80% and also that the type of nitrogen source did not influence this bioconversion. 相似文献