全文获取类型
收费全文 | 1869篇 |
免费 | 83篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 73篇 |
妇产科学 | 19篇 |
基础医学 | 188篇 |
口腔科学 | 43篇 |
临床医学 | 152篇 |
内科学 | 407篇 |
皮肤病学 | 31篇 |
神经病学 | 100篇 |
特种医学 | 43篇 |
外科学 | 266篇 |
综合类 | 80篇 |
预防医学 | 80篇 |
眼科学 | 68篇 |
药学 | 242篇 |
中国医学 | 22篇 |
肿瘤学 | 127篇 |
出版年
2023年 | 7篇 |
2022年 | 26篇 |
2021年 | 35篇 |
2020年 | 30篇 |
2019年 | 44篇 |
2018年 | 43篇 |
2017年 | 25篇 |
2016年 | 45篇 |
2015年 | 44篇 |
2014年 | 94篇 |
2013年 | 89篇 |
2012年 | 174篇 |
2011年 | 160篇 |
2010年 | 106篇 |
2009年 | 82篇 |
2008年 | 121篇 |
2007年 | 137篇 |
2006年 | 110篇 |
2005年 | 117篇 |
2004年 | 103篇 |
2003年 | 87篇 |
2002年 | 77篇 |
2001年 | 11篇 |
2000年 | 11篇 |
1999年 | 7篇 |
1998年 | 21篇 |
1997年 | 10篇 |
1996年 | 11篇 |
1995年 | 12篇 |
1993年 | 13篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1964年 | 2篇 |
排序方式: 共有1956条查询结果,搜索用时 15 毫秒
1.
Pankaj Hari Anand Srivastava Arun Kumar Gupta Rajendra N. Srivastava 《Pediatric nephrology (Berlin, Germany)》1997,11(4):497-498
Acute renal failure (ARF) developed in a 7-week-old infant due to bilateral candidal bezoars (fungal balls) causing obstruction
at the pelviureteric junction. The baby was born at term with an appropriate birthweight, and had been treated with broad-spectrum
antibiotics for respiratory distress and septicemia during the 1st week of life. Recovery from ARF followed renal decompression
with bilateral nephrostomy tube placement and parenteral administration of amphotericin B and 5-flucytosine.
Received August 21, 1996; received in revised form and accepted January 3, 1997 相似文献
2.
3.
Rajendra Nigam MD Richard Schottenfeld MD Thomas R. Kosten MD 《Journal of substance abuse treatment》1992,9(4):305-309
The authors describe the successful use of an adjunctive group psychotherapy for substance-abusing patients with major psychiatric disorders (bipolar, schizophrenia, schizoaffective, psychotic depression, and atypical psychosis). The group utilizes a psychoeducational approach that focuses on substance abuse causes and consequences, principles of recovery, and relapse prevention strategies. Eight patients with prolonged histories of abuse of cocaine, alcohol, marijuana, or other drugs were enrolled in this weekly group treatment at a community mental health center drug treatment program, while continuing in treatment with their current case manager or primary therapist. Six of the eight patients achieved periods of stable abstinence, documented by self-report, urine toxicology screens, continued group attendance, and improved social functioning. Case examples are utilized to illustrate the group process. 相似文献
4.
Dengue is a mosquito-borne viral disease caused by four antigenically distinct serotypes of dengue viruses (DENVs). This disease, which is prevalent in over a hundred tropical and sub-tropical countries of the world, represents a significant global public health problem. A tetravalent dengue vaccine capable of protecting against all four DENV serotypes has been elusive so far. Current efforts are focused on producing a tetravalent vaccine by mixing four monovalent vaccine components. In this work, we have utilized a discrete carboxy-terminal region of the major DENV envelope (E) protein, known as domain III (EDIII), which mediates virus entry into target cells and contains multiple serotype-specific neutralizing epitopes, to create a chimeric tetravalent antigen. This antigen derived by in-frame fusion of the EDIII-encoding sequences of the four DENV serotypes was expressed using a replication-defective recombinant human adenovirus type 5 (rAdV5) vaccine vector. This rAdV5 vector induced cell-mediated immune responses and virus-neutralizing antibodies specific to each of the four DENVs in mice. Interestingly, anti-AdV5 antibodies did not suppress the induction of DENV-specific neutralizing antibodies. We observed that anti-AdV5 antibodies in the sera of immunized mice could promote uptake of a rAdV5-derived reporter vector into U937 cells, suggesting that pre-existing immunity to AdV5 may in fact facilitate the uptake of rAdV5 vectored vaccines into antigen presenting cells. This work presents an alternative approach to developing a single component tetravalent vaccine that bypasses the complexities inherent in the currently adopted four-in-one physical mixture approach. 相似文献
5.
Anuraag Shrivastav Shailly Varma Anurag Saxena John DeCoteau Rajendra K Sharma 《Journal of translational medicine》2007,5(1):58-6
Background
Colon cancer is the second leading cause of cancer deaths in the western world. If detected early, colorectal cancer is one of the most treatable forms of cancer. Unfortunately, very few people are screened. N-myristoyltransferase (NMT) catalyzes myristoylation of various proteins including oncoproteins. We have demonstrated earlier the alteration of NMT activity during the progression of colorectal cancer and established NMT as a putative therapeutic target for cancer. 相似文献6.
Two cases of small peripheral papillary renal carcinoma causing large spontaneous perirenal hemorrhages are presented. The value and limitations of computerized tomography, ultrasonography, arteriography, and percutaneous aspiration biopsy in these cases are discussed. The need for careful explorative surgery and dissection of the specimen is emphasized. Excretory urography should be the first examination in all patients with renal pain and signs of internal bleeding. Arteriography should be done when the diagnosis is not evident. 相似文献
7.
Himanshu Nayak Rajendra Gadhavi Bhavin Solanki Bhagyalaxmi Aroor Hemant Gameti Kalpita S Shringarpure Jayun Joshi Zuveriya Kazi 《Bulletin of the World Health Organization》2022,100(8):484
ObjectiveTo implement a community-based screening and awareness-raising project for gestational diabetes in Ahmedabad, India.MethodsThe project took place between April 2016 and August 2019 in Ahmedabad. Medical college faculty members and medical officers trained 3582 paramedical staff on screening for gestational diabetes. These paramedical staff tested all pregnant women 24–28 weeks gestation, who were attending village health and nutrition days – also called mamta days – in urban and rural health centres for routine antenatal care, for gestational diabetes. An oral glucose tolerance test was used and blood sugar ≥ 7.8 mmol/L was the cut-off for gestational diabetes. Women with gestational diabetes were referred for counselling and treatment and all women were followed until 6 weeks after delivery.FindingsOf 53 522 pregnant women screened, 6786 (12.7%) had gestational diabetes and were referred for nutritional therapy or medication; 836 (12.3%) of these women started medication. There was no significant difference in the prevalence of stillbirths between women with gestational diabetes (0.8%; 54/6786) and women without (0.7%; 338/46 736; P-value: 0.51). Of the women on treatment, 38 had abnormal blood glucose after delivery and continued with the medication. Two women with gestational diabetes died; they had other associated co-morbidities – pre-eclampsia and anaemia.ConclusionWe found a high prevalence of gestational diabetes, indicating the need for gestational diabetes screening and implementation of this project on a larger scale. Gestational diabetes screening at the community level is operationally feasible using the existing human resources and infrastructure of the reproductive health programmes. 相似文献
8.
Fotso S Maskey RP Schröder D Ferrer AS Grün-Wollny I Laatsch H 《Journal of natural products》2008,71(9):1630-1633
2,5-Bis(hydroxymethyl)furan monoacetate (3) and 2,5-bis(hydroxymethyl)furan diacetate (4) were obtained as new natural products from an ethyl acetate extract of the terrestrial Streptomyces sp. isolate GW11/1695. Another Streptomyces isolate, GW21/1313, delivered a dimer (6) and a trimer (7) of (hydroxymethyl)furfural. The latter strain also produced 4-hydroxy-2-(5-(hydroxymethyl)furan-2-ylmethylene)-5-methylfuran-3-one (5), perlolyrin (8), and two new beta-carboline derivatives, 9 and 10. 2,5-Bis(hydroxymethyl)furan diacetate (4) exhibited weak cytotoxic activity against brine shrimp larvae. 相似文献
9.
Chandra Yogal Marianne Borgen Sunila Shakya Biraj Karmarcharya Rajendra Koju Mats P. Mosti Miriam K. Gustafsson Bjrn Olav svold Berit Schei Astrid Kamilla Stunes Unni Syversen 《Nutrients》2022,14(11)
Hypovitaminosis D is prevalent worldwide, and especially in South-Asia. According to the Institute of Medicine (IOM), 25(OH)D levels below 30 nmol/L are defined as vitamin D deficiency (VDD) and levels between 30–50 nmol/L as insufficiency (VDI). Besides its role in calcium homeostasis, it has been postulated that vitamin D is involved in metabolic syndrome. Given the scarcity of data on vitamin D status in Nepal, we aimed to examine the prevalence of VDD and VDI, as well as the determinants and association with metabolic parameters (lipids, HbA1c), in a cohort of women in rural Nepal. Altogether, 733 women 48.5 ± 11.7 years of age were included. VDD and VDI were observed in 6.3 and 42.4% of the participants, respectively, and the prevalence increased by age. Women reporting intake of milk and eggs > 2 times weekly had higher 25(OH)D levels than those reporting intake < 2 times weekly. Women with vitamin D levels < 50 nmol/L displayed higher levels of cholesterol, LDL-cholesterol, triglycerides, and HbA1c. Additionally, a regression analysis showed a significant association between hypovitaminosis D, dyslipidemia, and HbA1c elevation. In conclusion, VDI was prevalent and increased with age. Milk and egg intake > 2 times weekly seemed to decrease the risk of VDI. Moreover, hypovitaminosis D was associated with an adverse metabolic profile. 相似文献
10.
Acharya UR Tong J Subbhuraam VS Chua CK Ha TP Ghista DN Chattopadhyay S Ng KH Suri JS 《Journal of medical systems》2012,36(4):2483-2491
Diabetes is a chronic disease that is characterized by an increased blood glucose level due to insulin resistance. Type 2 diabetes is common in middle aged and old people. In this work, we present a technique to analyze dynamic foot pressures images and classify them into normal, diabetes type 2 with and without neuropathy classes. Plantar pressure images were obtained using the F-Scan (Tekscan, USA) in-shoe measurement system. We used Principal Component Analysis (PCA) and extracted the eigenvalues from different regions of the foot image. The features extracted from region 1 of the foot pressure image, which were found to be clinically significant, were fed into the Fuzzy classifier (Sugeno model) for automatic classification. Our results show that the proposed method is able to identify the unknown class with an accuracy of 93.7%, sensitivity of 100%, and specificity of 83.3%. Moreover, in this work, we have proposed an integrated index using the eigenvalues to differentiate the normal subjects from diabetes with and without neuropathy subjects using just one number. This index will help the clinicians in easy and objective daily screening, and it can also be used as an adjunct tool to cross check their diagnosis. 相似文献