全文获取类型
收费全文 | 1242篇 |
免费 | 59篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 45篇 |
妇产科学 | 7篇 |
基础医学 | 77篇 |
口腔科学 | 28篇 |
临床医学 | 85篇 |
内科学 | 335篇 |
皮肤病学 | 44篇 |
神经病学 | 109篇 |
特种医学 | 26篇 |
外科学 | 209篇 |
综合类 | 7篇 |
一般理论 | 2篇 |
预防医学 | 31篇 |
眼科学 | 143篇 |
药学 | 75篇 |
中国医学 | 1篇 |
肿瘤学 | 74篇 |
出版年
2024年 | 1篇 |
2023年 | 16篇 |
2022年 | 30篇 |
2021年 | 93篇 |
2020年 | 43篇 |
2019年 | 55篇 |
2018年 | 66篇 |
2017年 | 31篇 |
2016年 | 36篇 |
2015年 | 40篇 |
2014年 | 58篇 |
2013年 | 75篇 |
2012年 | 103篇 |
2011年 | 129篇 |
2010年 | 83篇 |
2009年 | 46篇 |
2008年 | 91篇 |
2007年 | 80篇 |
2006年 | 63篇 |
2005年 | 55篇 |
2004年 | 33篇 |
2003年 | 21篇 |
2002年 | 21篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1979年 | 1篇 |
1974年 | 1篇 |
1970年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有1306条查询结果,搜索用时 15 毫秒
991.
992.
993.
Alexandra Edelman Timothy Brown Roopa Gandhi Rishi Gandhi 《The Journal of clinical and aesthetic dermatology》2021,14(4):32
Anorectal melanoma is a rare and aggressive malignant neoplasm with an indolent course, manifesting with nonspecific symptoms and a poor prognosis. We present a case of anorectal melanoma that was initially treated as hemorrhoids and correctly diagnosed after lower gastrointestinal endoscopy. We also present the latest findings in the literature about anorectal melanomas and discuss updates about treatment options and management. 相似文献
994.
A new sapogenin 14beta, 26-epoxy serratane-3beta, 21alpha-diol has been isolated and characterized in addition to glucose, galactose and rhamnose from PRIMULA ROSEA. 相似文献
995.
A 15-item checklist for screening mentally retarded males for the fragile X syndrome 总被引:2,自引:0,他引:2
A 15-item checklist, including physical and behavioral features frequently observed in fragile X syndrome, was used in a prospective study of 188 mentally retarded males in order to identify males at risk for this syndrome. Of the 188 males, 19 were found to have the fragile X syndrome, while the remaining 169 males had no recognizable cause of their mental retardation, including normal chromosomes. Significant differences (p less than 0.01) were found between mentally retarded males with and without the fragile X syndrome with increased hyperactivity; shorter attention span; more tactile defensiveness, hand-flapping, perseverative speech, and hyperextensibility; large ears and testes; higher frequency of simian creases or Sydney lines and plantar creases; and more positive family histories of mental retardation in the fragile X syndrome males. Multiple regression and discriminant analyses of the 188 males indicated several physical features were useful predictors for inclusion in the fragile X syndrome group. An overall correct classification rate of 93% was achieved based on 6 variables (plantar crease, simian crease, hyperflexibility, large testes, large ears, and a positive family history of mental retardation) that were entered into the discriminant equation. Therefore, our experience with a 15-item checklist suggests the potential of screening for the fragile X syndrome in mentally retarded males and that 6 of the 15 variables were particularly good predictors of this syndrome. 相似文献
996.
997.
Iram Quraishi Mazhar Rishi Michael Feldman Michael J Wargovich Barbara Weber 《Applied immunohistochemistry & molecular morphology》2007,15(1):45-49
The results of previous studies done in our laboratory on breast cancer gene expression profile, using DNA microarrays, led to the discovery of several genes associated with breast cancer progression. Further evaluation of these genes and their involvement at various stages of cancer progression required performance of immunohistochemistry on thousands of different tissue blocks. Tissue microarray (TMA) technology facilitates rapid translation of DNA microarrays results to clinical specimens by using immunohistochemical analysis of protein expression. DNA microarray analysis done in our laboratory showed a significantly higher expression of prostatic-specific antigen (PSA) in invasive ductal carcinomas as compared to ductal carcinoma in situ, a finding contrary to the previously published data for PSA immunoreactivity in breast carcinomas. To find out whether TMA strategy could be used to explore the expression of the candidate genes involved in the breast cancer progression, we constructed a breast cancer progression TMA. It consisted of 2 normal ductal epithelium, 8 ductal carcinoma in situ, 19 invasive ductal carcinomas, and 3 metastatic ductal carcinomas of breast in triplets. Two prostatic adenocarcinomas and 2 normal colons were used as positive and negative controls, respectively. We first used well-documented and well-tested markers, such as antibodies to estrogen receptor, progesterone receptor, and p53. Results of these 3 antibodies were according to the previously published data. To validate our result, we then used antibody to PSA and looked for the expression of this protein on breast cancer progression TMA. Except for the 2 positive controls all 98 cores were found to be negative for PSA expression highlighting the importance of validation studies for DNA microarray results. 相似文献
998.
Shanmuganathan Rajasekaran Anupama Maheswaran Siddharth N. Aiyer Rishi Kanna Srikanth Reddy Dumpa Ajoy Prasad Shetty 《International orthopaedics》2016,40(6):1075-1081
Purpose
We aimed to formulate a radiological index based on plain radiographs and computer tomography (CT) to reliably detect posterior ligamentous complex (PLC) injury without need for MRI.Methods
Sixty out of 148 consecutive thoracolumbar fractures with doubtful PLC were assessed with MRI, CT and radiographs. PLC injury was assessed with the following radiological parameters: superior-inferior end plate angle (SIEA), vertebral body height (BH), local kyphosis (LK), inter-spinous distance (ISD) and inter-pedicular distance (IPD) and correlated with MRI findings of PLC injury. Statistical analysis was performed to identify the predictive values for the parameters to identify PLC damage.Results
MRI identified PLC injury in 25/60 cases. The ISD and LK were found to be significant predictors of PLC injury. On radiographs the mean LK with PLC damage was 25.86° compared to 21.02° with an intact PLC (p?=?0.006). The ISD difference was 6.70 mm in cases with PLC damage compared to 2.86 mm with an intact PLC (p?=?0.011). In CT images, the mean LK with PLC damage was 22.96° compared to 18.44° with an intact PLC ( p?=?0.019). The ISD difference was 3.10 mm with PLC damage compared to 1.62 mm without PLC damage (p?=?0.005).Conclusions
On plain radiographs the presence of LK greater than 20 °(CI 64–95) and ISD difference greater than 2 mm (CI 70–97) can predict PLC injury. These guidelines may be utilised in the emergency room especially when the associated cost, availability and time delay in performing MRI are a concern.999.
Retraction: Characterization of cellulolytic activities of newly isolated Thelephora sowerbyi from North‐Western Himalayas on different lignocellulosic substrates
下载免费PDF全文
![点击此处可从《Journal of basic microbiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
1000.