全文获取类型
收费全文 | 1999篇 |
免费 | 113篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 47篇 |
儿科学 | 37篇 |
妇产科学 | 103篇 |
基础医学 | 153篇 |
口腔科学 | 45篇 |
临床医学 | 191篇 |
内科学 | 446篇 |
皮肤病学 | 53篇 |
神经病学 | 142篇 |
特种医学 | 68篇 |
外国民族医学 | 1篇 |
外科学 | 314篇 |
综合类 | 40篇 |
预防医学 | 132篇 |
眼科学 | 75篇 |
药学 | 189篇 |
中国医学 | 10篇 |
肿瘤学 | 73篇 |
出版年
2024年 | 1篇 |
2023年 | 21篇 |
2022年 | 52篇 |
2021年 | 85篇 |
2020年 | 40篇 |
2019年 | 68篇 |
2018年 | 73篇 |
2017年 | 51篇 |
2016年 | 65篇 |
2015年 | 84篇 |
2014年 | 90篇 |
2013年 | 121篇 |
2012年 | 180篇 |
2011年 | 156篇 |
2010年 | 102篇 |
2009年 | 95篇 |
2008年 | 141篇 |
2007年 | 127篇 |
2006年 | 122篇 |
2005年 | 121篇 |
2004年 | 107篇 |
2003年 | 63篇 |
2002年 | 54篇 |
2001年 | 17篇 |
2000年 | 13篇 |
1999年 | 15篇 |
1998年 | 9篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1980年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1930年 | 1篇 |
排序方式: 共有2119条查询结果,搜索用时 15 毫秒
61.
Petra Baji László Gulácsi Barbara D. Lovász Petra A. Golovics Valentin Brodszky Márta Péntek 《Scandinavian journal of gastroenterology》2016,51(1):22-27
Objective. To explore preferences of gastroenterologists for biosimilar drugs in Crohn’s disease. Material and methods. Discrete choice experiment was carried out involving 51 Hungarian gastroenterologists in May 2014. The following attributes were used to describe hypothetical choice sets: 1) type of the treatment (biosimilar/originator), 2) severity of disease, 3) availability of continuous medicine supply, 4) frequency of the efficacy check-ups. Multinomial logit model was used to differentiate between three attitude types: 1) always opting for the originator, 2) willing to consider biosimilar for biological-naïve patients only, 3) willing to consider biosimilar treatment for both types of patients. Conditional logit model was used to estimate the probabilities of choosing a given profile. Results. Men, senior consultants, working in inflammatory bowel disease center and treating more patients were more likely willing to consider biosimilar for biological-naïve patients only. Treatment type (originator/biosimilar) was the most important determinant of choice for patients already treated with biologicals, and the availability of continuous medicine supply in case of biological-naïve patients. The probabilities of choosing the biosimilar with all the benefits offered over the originator under current reimbursement conditions are 89% versus 11% for new patients, and 44% versus 56% for patients already treated with biological. Conclusions. For gastroenterologist, the continuous medical supply would be one of the major benefits of biosimilars. However, benefits offered in the scenarios do not compensate for the change from the originator to the biosimilar treatment of patients already treated with biologicals. 相似文献
62.
Syed Qaiser Shah Gul‐e‐Raana Ghias Uddin 《Journal of labelled compounds & radiopharmaceuticals》2018,61(7):550-556
This investigation aimed to modify finasteride ( 1 ) to finasteride dithiocarbamate ( 2 ) for subsequent synthesis of the rhenium analogue ( 3 ) and [99mTc]tricarbonyl complexes ( 4 ), to assess its prostate cancer (PCa) targeting potential in a rat model. To validate the identity of ( 4) , reference ( 3) has been synthesized by using fac‐[Net4]2[ReBr3(CO)3] precursor and characterized by 1H‐NMR, 13C‐NMR, ESI‐MS, and elemental analysis. The analogue ( 4) was synthesized by using fac‐[99mTc(H2O)3(CO)3]+ precursor, and its structure was confirmed by comparative HPLC by using ( 3) as a reference. Further, the suitability of ( 4) as a PCa imaging agent was investigated in vitro and in vivo. At room temperature, ( 4) had ≥99% radiochemical purity and remained ≥84% stable in serum. In preclinical studies, biodistribution of ( 4) in histopathologically established rat model showed adequately high in vivo uptake in the prostate attracting the possibility of using it for noninvasive imaging of PCa. 相似文献
63.
64.
Chondrodermatitis nodularis helicis (CNH) is a rare condition of the pinna affecting mainly adults. A pediatric case of this condition is presented in the current report, and the literature of pediatric CNH is reviewed. 相似文献
65.
Annika Treyball Audrey C. Bergeron Daniel J. Brooks Audrie L. Langlais Hina Hashmi Kenichi Nagano Deborah Barlow Ryan J. Neilson Tyler A. Roy Kathleen T. Nevola Karen L. Houseknecht Roland Baron Mary L. Bouxsein Anyonya R. Guntur Katherine J. Motyl 《Journal of bone and mineral research》2022,37(5):954-971
Although the nonselective β-blocker, propranolol, improves bone density with parathyroid hormone (PTH) treatment in mice, the mechanism of this effect is unclear. To address this, we used a combination of in vitro and in vivo approaches to address how propranolol influences bone remodeling in the context of PTH treatment. In female C57BL/6J mice, intermittent PTH and propranolol administration had complementary effects in the trabecular bone of the distal femur and fifth lumbar vertebra (L5), with combination treatment achieving microarchitectural parameters beyond that of PTH alone. Combined treatment improved the serum bone formation marker, procollagen type 1 N propeptide (P1NP), but did not impact other histomorphometric parameters relating to osteoblast function at the L5. In vitro, propranolol amplified the acute, PTH-induced, intracellular calcium signal in osteoblast-like cells. The most striking finding, however, was suppression of PTH-induced bone resorption. Despite this, PTH-induced receptor activator of nuclear factor κ-B ligand (RANKL) mRNA and protein levels were unaltered by propranolol, which led us to hypothesize that propranolol could act directly on osteoclasts. Using in situ methods, we found Adrb2 expression in osteoclasts in vivo, suggesting β-blockers may directly impact osteoclasts. Consistent with this, we found propranolol directly suppresses osteoclast differentiation in vitro. Taken together, this work suggests a strong anti-osteoclastic effect of nonselective β-blockers in vivo, indicating that combining propranolol with PTH could be beneficial to patients with extremely low bone density. © 2022 American Society for Bone and Mineral Research (ASBMR). 相似文献
66.
Coronary artery thromboembolism: Unexpected presentation of left atrial myxoma covered with thrombus
Samet Uysal MD Ayse Zehra Karakoc MD Kadir Biyikli MD Benay Erden MD Ozkan Candan MD Gonca Gul Gecmen MD 《Journal of cardiac surgery》2020,35(8):2097-2099
Cardiac myxomas are benign primer cardiac tumors of the heart. They can be fatal with a thromboembolic presentation. Myocardial infarction is one of these unusual thromboembolic presentations. We report a patient who presented with cardiac arrest due to ventricular fibrillation related to myocardial infarction. After successful resuscitation, coronary angiography and transthoracic echocardiography were performed. A left atrial mass was observed and interpreted as a possible cause of coronary embolism leading to myocardial infarction. After surgical excision, the pathological examination confirmed myxoma, which was the essential cause of the tendency to arterial embolism. 相似文献
67.
M. Saeed Arayne Najma Sultana Somia Gul Ajmal Khan 《Medicinal chemistry research》2014,23(3):1248-1256
Sparfloxacin (SPFX) or 5-amino-1-cyclopropyl-7-[(3R,5S)3,5-dimethylpiperazine-1-yl]-6,8-difluoro-4-oxo-quinoline-3-carboxylic acid is an orally active synthetic, broad spectrum third generation quinolone, with excellent activity against Gram-positive bacteria with selectivity against anaerobes and atypical pathogens. Three derivatives of SPFX (2, 3, and 4) were synthesized by reacting different aromatic carboxylic acids with SPFX (1). Chemistry involved the formation of amide between reacting species through nucleophilic substitution reactions. The synthesized derivatives were then structurally characterized by IR, NMR, and mass spectroscopic techniques. The antimicrobial activities of these derivatives were evaluated against four Gram-positive, seven Gram-negative bacteria, and six fungi, using SPFX as a reference. Statistical analysis revealed these derivatives as active antimicrobial agents, and 2 was more potent antimicrobial agents than the parent drug as well other fluoroquinolones. Compounds 3 and 4 showed a significant activity against Fusarium solani. Moreover, these three derivatives were evaluated for inhibitory activities against enzyme urease, carbonic anhydrase II, and α-chymotrypsin. Results showed their selectivity against urease enzyme. Based on their nontoxic behavior, these derivatives may be potential agents for further studies. 相似文献
68.
Ustun Yilmaz Aysun Unal Semih Gul Gulay Demirtas Ayca Inci Yasin Sahinturk 《Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy》2022,26(1):191-196
This prospective study compared methods using both arterial and venous needles with back eyes with those using only arterial needle with back eye for arteriovenous fistula cannulation. Sixty-one patients receiving hemodialysis (HD) via an arteriovenous fistula were evaluated. All patients underwent arteriovenous fistula puncture using only arterial needle with back eye in first 3 months and both arterial and venous needles with back eyes in following 3 months. Arterial and venous pressures, blood flow velocities, total blood volume cleared, and Kt/V values were compared. Mean blood flow velocity, arterial pressure, Kt/V, and cleared total blood volume values were higher and venous pressure was lower in patients who underwent cannulation using both needles with back eyes than in those with only the arterial needle with back eye. For arteriovenous fistula cannulation, using both arterial and venous needles with back eyes provides adequate HD more successfully. 相似文献
69.
Yucel Erbilgin Ozden Hatirnaz Ng Ismail Can Sinem Firtina Fulya Kucukcankurt Serap Karaman Zeynep Karakas Tulin Tiraje Celkan Emine Zengin Sema Aylan Gelen Gul Nihal Ozdemir Yildiz Yildirmak Omer Dogru Turkan Tansel Khusan Khodzhaev Ozlem Toluk Ugur Ozbek Muge Sayitoglu 《International journal of laboratory hematology》2021,43(5):1093-1103
70.
Nasruddin Jaafar Hina Hakim Nor Azlida Mohd Nor Asma Mohamed Roslan Saub Rashidah Esa Jennifer Doss Zamros Yuzadi Mohd Yusof Norintan Ab-Murat Noor Lide Abu Kassim Hazreen Abdul Majid 《BMC public health》2014,14(Z3):S2