全文获取类型
收费全文 | 1739篇 |
免费 | 83篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 128篇 |
妇产科学 | 40篇 |
基础医学 | 207篇 |
口腔科学 | 50篇 |
临床医学 | 136篇 |
内科学 | 392篇 |
皮肤病学 | 72篇 |
神经病学 | 94篇 |
特种医学 | 57篇 |
外科学 | 163篇 |
综合类 | 43篇 |
预防医学 | 74篇 |
眼科学 | 77篇 |
药学 | 180篇 |
中国医学 | 14篇 |
肿瘤学 | 87篇 |
出版年
2024年 | 3篇 |
2023年 | 8篇 |
2022年 | 17篇 |
2021年 | 46篇 |
2020年 | 41篇 |
2019年 | 32篇 |
2018年 | 62篇 |
2017年 | 46篇 |
2016年 | 48篇 |
2015年 | 48篇 |
2014年 | 82篇 |
2013年 | 83篇 |
2012年 | 153篇 |
2011年 | 143篇 |
2010年 | 95篇 |
2009年 | 67篇 |
2008年 | 137篇 |
2007年 | 122篇 |
2006年 | 108篇 |
2005年 | 93篇 |
2004年 | 84篇 |
2003年 | 90篇 |
2002年 | 55篇 |
2001年 | 32篇 |
2000年 | 25篇 |
1999年 | 27篇 |
1998年 | 11篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1975年 | 2篇 |
1969年 | 1篇 |
1965年 | 3篇 |
1956年 | 1篇 |
排序方式: 共有1827条查询结果,搜索用时 15 毫秒
71.
Vandana Shashi Thomas R. Kwapil Jessica Kaczorowski Margaret N. Berry Cesar S. Santos Timothy D. Howard Dhruman Goradia Konasale Prasad Diwadkar Vaibhav Rajaprabhakaran Rajarethinam Edward Spence Matcheri S. Keshavan 《Psychiatry Research: Neuroimaging》2010,181(1):1-8
Chromosome 22q11.2 deletion syndrome (22q11DS) is associated with cognitive deficits and morphometric brain abnormalities in childhood and a markedly elevated risk of schizophrenia in adolescence/early adulthood. Determining the relationship between neurocognition and neuroimaging findings would yield crucial information about childhood neurodevelopment and provide a basis for the study of the trajectory that occurs on the pathway to psychosis. We compared morphometric brain findings between non-psychotic children with 22q11DS (n = 22) and healthy controls (n = 16), and examined the association between neurocognitive functioning and morphometric brain findings. Volumetric regional gray matter differences between the 22q11DS and control subjects were measured, and correlations of the regional gray matter volumes and neurocognition were performed. Children with 22q11DS demonstrated reductions in gray matter in several brain regions, chiefly the frontal cortices, the cingulate gyrus and the cerebellum. The volumetric reductions in these salient areas were associated with poor performance in sustained attention, executive function and verbal memory; however, the relation of brain volume with cognitive performance did not differ between the patient and control groups. Thus, children with 22q11DS demonstrate gray matter reductions in multiple brain regions that are thought to be relevant to schizophrenia. The correlation of these volumetric reductions with poor neurocognition indicates that these brain regions may mediate higher neurocognitive functions implicated in schizophrenia. 相似文献
72.
Keepanasseril Anish Nayak Deepthi Bojja Vandana Gupta Avantika Chakkalakkoombil Sunitha Vellathussery Nair Pradeep Pankajakshan Thilaganathan Baskaran 《Neurological sciences》2022,43(6):3839-3846
Neurological Sciences - Pregnant women developing generalised tonic–clonic seizures in the absence of a prior neurological disorder are often diagnosed as eclamptic. Posterior reversible... 相似文献
73.
Rajesh Verma Sunita Kakkar Biju Vasudevan Vandana Rana Debdeep Mitra Shekar Neema 《Indian journal of dermatology》2015,60(2):188-190
A 51-year-old male presented with blackish discoloration of nails of 10 months duration. Examination revealed black dystrophic left thumb finger nail. Detailed examination showed a mass under the dystrophic nail. Hutchinson sign was positive. Histopathology revealed characteristic features of melanoma. A detailed evaluation revealed no features of local or distant metastasis. The entire lesion was then removed surgically along with disarticulation at the interphalangeal joint. Resection-free margin was confirmed. This case is being reported for the rare occurrence of subungual melanoma in the Indian population and also for presentation with a long history of lesion with no evidence of metastasis. 相似文献
74.
The Public Health Resource Network is an innovative distance-learning course in training, motivating, empowering and building a network of health personnel from government and civil society groups. Its aim is to build human resource capacity for strengthening decentralized health planning, especially at the district level, to improve accountability of health systems, elicit community participation for health, ensure equitable and accessible health facilities and to bring about convergence in programmes and services. 相似文献
75.
Vandana Jain Supriya Dabir Debraj Shome Tina Dadu Sundaram Natarajan 《Survey of ophthalmology》2009,54(2):286
We report the case of a 25-year-old male patient who presented with complaints of redness, photophobia, and decreased vision in the right eye of a week's duration. Slit-lamp biomicroscopic examination revealed a cream-colored, irregular elevated inferior iris mass, extending on to the anterior lens surface. Differential diagnoses of a fungal granuloma, a medulloepithelioma, and an amelanotic melanoma were considered. An excisional biopsy of the mass was performed through a superior clear corneal incision. Polymerase chain reaction analysis of the aqueous humor showed a positive pan fungal genome. Histopathology of the biopsied mass showed a giant cell granuloma with surrounding numerous branching, septate hyphae. Culture growth revealed Aspergillus fumigatus We report this case because of the rarity of Aspergillus iris granuloma as a primary presentation of endogenous Aspergillosis and review the relevant literature. Absence of a significant systemic history compounded the diagnostic dilemma in our patient. Definitive differentiation of this rare entity from a foreign body, amelanotic melanoma, and other inflammatory conditions such as sarcoidosis and tuberculosis, may be possible only on microbiological and histo-pathological evaluation. 相似文献
76.
BACKGROUND: Dermatological manifestations of sexually transmitted diseases (STDs) range from full body papulosquamous eruptions to genital ulcers and warts. The transmission, prevalence, and disease burden of STDs are not shared equally between the sexes. OBSERVATIONS: Women are more susceptible than men for the acquisition of the human immunodeficiency virus and other dangerous STDs because of economic, biological, and social factors, and often sustain more damage to their health from the disease.Conclusion This review article elucidates the differential effect of STDs on women vs men to better understand what is required to protect women from the morbidity and mortality of STDs. 相似文献
77.
A 12-year-old boy born of a nonconsanguineous marriage presented with dry rough skin and photophobia since birth. His growth and developmental milestones were normal and there was no history of any neurological problem, hearing deficit or scarring around the hair follicles. Cutaneous examination revealed diffuse thinning of scalp hair with loss of eyebrows and eyelashes and a sandpapery texture of the skin all over the body, suggestive of ichthyosis follicularis with alopecia and photophobia syndrome. 相似文献
78.
Mango butter was explored as a functional, natural supplement and active skin ingredient in skin care formulations. A foot care cream was developed with mango butter to evaluate its medicinal value and protective function in skin repair. Qualitative comparison and clinical case studies of the product were carried out. Wound healing potential of foot care cream was investigated on the rat excision and incision wound models. Results of the clinical studies demonstrated complete repair of worn and cracked skin in all the human volunteers. Furthermore, foot care cream exhibited significant healing response in both the wound models. The project work could be concluded as establishment of high potential for mango butter to yield excellent emolliency for better skin protection. Improving the product features and medicinal functionality further validate mango butter as a specialty excipient in development of cosmeceuticals and has an immense value for its commercialization. 相似文献
79.
Chawla S Gupta RK Kumar R Garg M Pradhan S Pal L Husain N Gupta A Rathore RK 《Clinical radiology》2002,57(9):826-834
AIM: This study was performed to determine the magnetic resonance imaging (MRI) sequence that was best suited to demonstrate the scolex in a calcified lesion and to seek the explanation for the appearance of a negative phase in a calcified scolex on corrected gradient refocused echo (GRE) phase imaging. MATERIALS AND METHODS: Forty-nine patients with single/multiple computed tomography (CT) documented homogeneous calcified lesions and/or calcified scolices in cysts were studied with conventional spin echo and corrected GRE phase imaging. Calcium and different paramagnetic substances from cysticerci scolices of a sample of infected swine muscle were quantified. RESULTS: The scolex could be demonstrated in 29/39 patients with single calcified lesion. GRE imaging with an echo time of 35ms was the only sequence that demonstrated scolex in all these 29 cases. 15/29 patients with a single calcified lesion, in all 10 patients with multiple calcified lesions and infected swine muscle with multiple cysts and calcified scolex, corrected GRE phase imaging showed negative phase in all these scolices. Estimation of minerals from the calcified scolices from the swine muscle showed by spectroscopic techniques 41.2% of the total mineral contents as paramagnetic substances. CONCLUSION: We conclude that GRE imaging is the imaging method of choice for demonstration of the scolex in a CT calcified lesion. The negative phase on corrected GRE phase imaging is due to the presence of large amount of paramagnetic substances. 相似文献
80.