全文获取类型
收费全文 | 2812篇 |
免费 | 139篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 53篇 |
妇产科学 | 88篇 |
基础医学 | 203篇 |
口腔科学 | 56篇 |
临床医学 | 236篇 |
内科学 | 574篇 |
皮肤病学 | 50篇 |
神经病学 | 165篇 |
特种医学 | 244篇 |
外国民族医学 | 2篇 |
外科学 | 427篇 |
综合类 | 77篇 |
一般理论 | 2篇 |
预防医学 | 294篇 |
眼科学 | 100篇 |
药学 | 233篇 |
中国医学 | 20篇 |
肿瘤学 | 136篇 |
出版年
2023年 | 18篇 |
2022年 | 80篇 |
2021年 | 108篇 |
2020年 | 75篇 |
2019年 | 98篇 |
2018年 | 131篇 |
2017年 | 76篇 |
2016年 | 92篇 |
2015年 | 80篇 |
2014年 | 136篇 |
2013年 | 162篇 |
2012年 | 206篇 |
2011年 | 244篇 |
2010年 | 130篇 |
2009年 | 100篇 |
2008年 | 148篇 |
2007年 | 166篇 |
2006年 | 149篇 |
2005年 | 154篇 |
2004年 | 107篇 |
2003年 | 76篇 |
2002年 | 92篇 |
2001年 | 43篇 |
2000年 | 23篇 |
1999年 | 23篇 |
1998年 | 13篇 |
1997年 | 14篇 |
1996年 | 7篇 |
1995年 | 11篇 |
1994年 | 4篇 |
1993年 | 8篇 |
1992年 | 20篇 |
1991年 | 16篇 |
1990年 | 12篇 |
1989年 | 12篇 |
1988年 | 13篇 |
1987年 | 19篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 9篇 |
1983年 | 3篇 |
1975年 | 5篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 10篇 |
1971年 | 4篇 |
1970年 | 4篇 |
1969年 | 11篇 |
1968年 | 3篇 |
1967年 | 2篇 |
排序方式: 共有2972条查询结果,搜索用时 15 毫秒
1.
2.
Neil H Pliskin Alia N Ammar Joseph W Fink S Kristian Hill Aaron C Malina Alona Ramati Kathleen M Kelley Raphael C Lee 《Journal of the International Neuropsychological Society》2006,12(1):17-23
The clinical presentation of electrical injury commonly involves physical, cognitive, and emotional complaints. Neuropsychological studies, including case reports, have indicated that electrical injury (EI) survivors may experience a broad range of impaired neuropsychological functions, although this has not been clarified through controlled investigation. In this study, we describe the neuropsychological test findings in a series of 29 EI patients carefully screened and matched to a group of 29 demographically similar healthy electricians. Participants were matched by their estimated premorbid intellectual ability. Multivariate analysis of variance was used to assess group differences in the following neuropsychological domains: attention and mental speed, working memory, verbal memory, visual memory, and motor skills. EI patients performed significantly worse on composite measures of attention/mental speed and motor skills, which could not be explained by demographic differences, injury parameters, litigation status, or mood disturbance. Results suggest that cognitive changes do occur in patients suffering from electrical injury. 相似文献
3.
Sami Al-Said Ammar Ali Abdul Kader Alobaidy Emad Mojeeb Abdulla Al-Naimi Ahmed A Shokeir 《International journal of urology》2007,14(5):452-454
Xanthogranulomatous orchitis is an extremely rare inflammatory non-neoplastic destructive lesion of the testis. We report a 44-year-old man who presented with right scrotal swelling and two discharging sinuses. Testicular tumor markers were normal. Scrotal ultrasound showed heterogeneous testicular areas and irregular margin of the tunica. Surgical exploration revealed infected, unhealthy testicular tissue with necrosis and tumor-like lesion. Orchidectomy was done and histopathology showed xanthogranulomatous orchitis. 相似文献
4.
5.
6.
Sandrine Péroche Ghania Degobert Jean-Luc Putaux Marie-Geneviève Blanchin Hatem Fessi Hélène Parrot-Lopez 《European journal of pharmaceutics and biopharmaceutics》2005,60(1):123-131
This work describes the synthesis of new amphiphilic perfluorohexyl- and perfluorooctyl-propanethio-beta-cyclodextrins and the comparison of the ability of these molecules and alkyl analogue, nonanethio-beta-cyclodextrin to form nanospheres. Nanospheres were prepared using nanoprecipitation method (perfluoroalkylthio-beta-cyclodextrin in THF [0.11 x 10(-3)M], stirring rate 700rpm, addition of aqueous phase at 64 degrees C into organic phase at 50 degrees C). They were characterised by Photon Correlation Spectroscopy (PCS) and by electron microscopy (SEM and cryo-TEM). The nanospheres prepared from these new beta-cyclodextrin derivatives have an average size of 260nm, and appear to be spherical in cryo-TEM images. Whereas alkyl analogue forms polydisperse aggregates with sizes in the range 60-350nm. 相似文献
7.
Impaired in-vitro proliferation of hemopoietic precursors in HIV-1-infected subjects 总被引:1,自引:0,他引:1
Y Lunardi-Iskandar V Georgoulias A M Bertoli Y Augery-Bourget A Ammar D Vittecoq W Rosenbaum P Meyer C Jasmin 《Leukemia research》1989,13(7):573-581
Patients with acquired immunodeficiency syndrome (AIDS) and persistent lymphadenopathy syndrome (LAS) display significant hematological abnormalities of one or more cell lineages. In order to understand the pathophysiologic mechanisms leading to these abnormalities we studied the proliferation capacity of pluripotent and committed hemopoietic precursors using in-vitro colony assays. Anemia, leukopenia and thrombopenia were relatively frequent findings in HIV-infected subjects irrespectively of the patients' clinical status. The colony growth capacity of AIDS patients' GM-CFU and BFU-E was significantly decreased whereas no GEMM-CFU colonies could be obtained. There was no correlation between the number of BFU-E and GM-CFU colony number and the hemoglobin or the absolute number of polynuclear cells, respectively. The plating efficiency of both committed and pluripotent hematopoietic precursors from HIV infected patients could not be enhanced when additional exogenous recombinant GM-CSF, human interleukin 3 or erythropoietin were added in contrast to normal patients' cells. In addition, the impaired colony growth of these precursors could not be restored after adherent or T-cell depletion or the addition of normal allogenic irradiated adherent or/and T cells. Since this colony growth abnormality was also detected in HIV seropositive asymptomatic subjects our findings strongly suggest that the in-vitro growth of hematopoietic precursors is affected early after HIV-1 infection. 相似文献
8.
Abdel Wahab M. Ibrahim Saad M. Al-Rajeh Upendra Mohan Chowdhary Ahmed Ammar 《Neurosurgical review》1990,13(2):103-107
There are significant variations among countries in the incidence of brain abscess. We report here 26 cases of brain abscess treated at the Neurosurgery Department of King Faisal University and Dammam Central Hospital Saudi Arabia over a six year period (1982–1988). This is 2.3% of total admissions to the two neurosurgery departments serving a population of approximately 1.2 million in the same period.Young males were most often affected (M/F ratio 3.3:1; 31% were less than 15 years old, 46% aged between 15–39 years, and 23% older than 40 years). Streptococcus was found to be the most common microorganism (38.4%). Mixed infection was seen in 15.3%, and sterile abscesses were found in 11.5% of the patients after aerobic and anaerobic cultures of the pus. Chronic otitis media and paranasal sinusitis predisposed the patients to abscess formation in 57.6% of the cases. The temporo-parietal area was the commonest site. Epilepsy was a complication in 30.7% of our patients, and the mortality rate was 15.3%. 相似文献
9.
M Hatem F Anthony P Hogston D J Rowe K J Dennis 《British medical journal (Clinical research ed.)》1988,296(6623):676-678
A 75 g oral glucose tolerance test was performed in 212 pregnant women with no predisposing factors suggesting glucose intolerance to establish the normal pattern of glucose metabolism in pregnancy. Reference values for the test were established for the middle of pregnancy (14-20 weeks, n = 43) and late pregnancy (28-37 weeks, n = 168). One woman was excluded because she had diabetes that required treatment with insulin. There were statistically significant differences between the two groups for samples taken both one and two hours after the glucose load. Reference ranges for the interpretation of the glucose tolerance test in pregnancy should therefore take account of the period of gestation. Arbitrary upper limits of normal (represented by the 97.5 centile) two hours after a 75 g oral glucose load are proposed at 7.5 and 9.6 mmol/l for the second and third trimesters, respectively. 相似文献
10.
The carotid artery stump pressure has been used as a criterion for selective placement of a shunt during carotid endarterectomy. The purpose of our study was to correlate the carotid stump pressure with the presence or absence of a palpable pulse in the carotid stump. One hundred twenty-two consecutive patients undergoing carotid endarterectomy under general anesthesia were checked for a palpable pulse in the internal carotid stump with subsequent measurements of the stump pressure. Of these patients, 88 had a palpable pulse and a pressure greater than or equal to 44 mmHg. The remaining 34 had a absent pulse and a stump pressure of 40 mmHg or less. Shunts were not used in those patients with a palpable pulse and no history of previous stroke or contralateral carotid occlusion. There were no serious neurological complications. We conclude that the presence of a palpable pulse in the carotid stump is a sufficient criterion for performing carotid endarterectomy without a shunt in those patients with no previous history of stroke or contralateral carotid occlusion. 相似文献