全文获取类型
收费全文 | 377篇 |
免费 | 24篇 |
国内免费 | 2篇 |
专业分类
儿科学 | 6篇 |
基础医学 | 74篇 |
口腔科学 | 3篇 |
临床医学 | 31篇 |
内科学 | 92篇 |
皮肤病学 | 14篇 |
神经病学 | 19篇 |
特种医学 | 11篇 |
外科学 | 22篇 |
综合类 | 1篇 |
现状与发展 | 1篇 |
预防医学 | 18篇 |
眼科学 | 1篇 |
药学 | 31篇 |
中国医学 | 7篇 |
肿瘤学 | 72篇 |
出版年
2023年 | 8篇 |
2022年 | 30篇 |
2021年 | 22篇 |
2020年 | 10篇 |
2019年 | 10篇 |
2018年 | 11篇 |
2017年 | 5篇 |
2016年 | 11篇 |
2015年 | 21篇 |
2014年 | 18篇 |
2013年 | 18篇 |
2012年 | 29篇 |
2011年 | 20篇 |
2010年 | 22篇 |
2009年 | 11篇 |
2008年 | 17篇 |
2007年 | 20篇 |
2006年 | 16篇 |
2005年 | 25篇 |
2004年 | 16篇 |
2003年 | 17篇 |
2002年 | 18篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1990年 | 1篇 |
排序方式: 共有403条查询结果,搜索用时 0 毫秒
91.
Ksenia Babina Dilara Salikhova Maria Polyakova Oxana Svitich Roman Samoylikov Samya Ahmad El-Abed Alexandr Zaytsev Nina Novozhilova 《Nutrients》2022,14(5)
We aimed to assess the effect of oral probiotics containing the Streptococcus salivarius K12 strain on the salivary level of secretory immunoglobulin A, salivation rate, and oral biofilm. Thirty-one consenting patients meeting the inclusion criteria were recruited in this double-blind, placebo-controlled, two-arm, parallel-group study and randomly divided into probiotic (n = 15) and placebo (n = 16) groups. Unstimulated salivation rate, concentration of salivary secretory immunoglobulin A, Turesky index, and Papillary-Marginal-Attached index were assessed after 4 weeks of intervention and 2 weeks of washout. Thirty patients completed the entire study protocol. We found no increase in salivary secretory immunoglobulin A levels and salivary flow rates in the probiotic group compared with placebo. Baseline and outcome salivary secretory immunoglobulin A concentrations (mg/L) were 226 ± 130 and 200 ± 113 for the probiotic group and 205 ± 92 and 191 ± 97 for the placebo group, respectively. A significant decrease in plaque accumulation was observed in the probiotic group at 4 and 6 weeks. Within the limitations of the present study, it may be concluded that probiotic intake (Streptococcus salivarius K12) does not affect salivation rates and secretory immunoglobulin A salivary levels but exhibits a positive effect on plaque accumulation. Trial registration . Funding: none. NCT05039320相似文献
92.
Alena A. Lokteva Anastasiia A. Kotelnikova Roman S. Kovylin Alexey N. Konev Alexandr V. Piskunov 《Materials》2022,15(21)
In this work, nanoporous antireflective coatings on silicate glass were obtained from silicon dioxide sol compositions by the sol-gel method in the presence of quaternary ammonium salt (tetrabutylammonium bromide) at different annealing temperatures (200–250 °C). Varying the salt concentration from 3 to 5 wt.%, we achieved the transmittance of the coatings of about 97% at 250 °C in comparison with 91% for clean glass in the wavelength range from 400 to 1100 nm. The addition of gold nanoparticles to the composition containing 5 wt.% tetrabutylammonium bromide allowed us to decrease the annealing temperature to 200 °C, preserving the transmittance at the level of 96.5%. For this case, the optimal concentration of gold nanoparticles is determined (2.6 × 10−9 mol/mL). According to the SEM analysis, the obtained antireflective coatings contain pores with a minimum area size up to 4 nm2. 相似文献
93.
Maarten A. A. van de Klundert Anastasiia Antonova Giulia Di Teodoro Rafael Cea Diez Nikoloz Chkhartishvili Eva Heger Anna Kuznetsova Aleksey Lebedev Aswathy Narayanan Ekaterina Ozhmegova Alexander Pronin Andrey Shemshura Alexandr Tumanov Nico Pfeifer Rolf Kaiser Francesco Saladini Maurizio Zazzi Francesca Incardona Marina Bobkova Anders Snnerborg 《Viruses》2022,14(10)
94.
This article describes a technology for the thermomechanical treatment of stainless-steel piston rings. This technology makes it possible to obtain rings with an optimal combination of plastic and strength properties that is essential for piston rings. The following thermomechanical treatment is suggested for piston rings manufacturing: quenching at 1050 °C, holding for 30 min and cooling in water, then straining by the HPT method for eight cycles at cryogenic temperature and annealing at a temperature up to 600 °C. The resulting microstructure consisted of fine austenite grains sized 0.3 μm and evenly distributed carbide particles. Annealing above this temperature led to the formation of ferrite in the structure; however, preserving the maximum fraction of austenitic component is very important, since the reduction of austenite in the structure will cause a deterioration of corrosion resistance. The strength properties of steel after such treatment increased by almost two times compared with the initial ones: microhardness increased from 980 MPa to 2425 MPa, relative elongation increased by 20%. The proposed technology will improve the strength and performance characteristics of piston rings, as well as increase their service life, which will lead to significant savings in the cost of repair, replacement and downtime. 相似文献
95.
Syrjänen K Shabalova I Petrovichev N Kozachenko V Zakharova T Pajanidi J Podistov J Chemeris G Sozaeva L Lipova E Tsidaeva I Ivanchenko O Pshepurko A Zakharenko S Nerovjna R Kljukina L Erokhina O Branovskaja M Nikitina M Grunberga V Grunberg A Juschenko A Santopietro R Cintorino M Tosi P Syrjänen S 《European journal of epidemiology》2007,22(10):723-735
Background Recent evidence implicates smoking as a risk factor for cervical cancer (CC), but the confounding from high-risk human papillomavirus
(HPV) infections is not clear. Objectives To analyse the role of smoking as an independent predictor of CIN2+ and HR-HPV infections in a population-based prospective
(NIS, New Independent States of former Soviet Union) cohort study. Study design and Methods A cohort of 3,187 women was stratified into three groups according to their smoking status: (i) women who never smoked; (ii)
those smoking in the past; and (iii) women who are current smokers. These groups were analysed for predictors of (a) HR-HPV;
(b) high-grade CIN, and (c) outcome of HR-HPV infections and cytological abnormalities during prospective follow-up (n = 854). Results The three groups were significantly different in all major indicators or risk sexual behaviour (or history) implicating strong
confounding. There was no increase in HSIL/LSIL/ASC-US cytology or CIN1+/CIN2+/CIN3+ among current smokers. Only few predictors
of HR-HPV and CIN2+ were common to all three groups, indicating strong interference of the smoking status. There was no difference
in outcomes of cervical disease or HR-HPV infections between the three groups. In multivariate model, being current smoker
was one of the five independent predictors of HR-HPV (P = 0.014), with adjusted OR = 1.52 (95%CI 1.09–2.14). In addition to age, HR-HPV was the only independent predictor of CIN2+
in multivariate model (OR = 14.8; 95%CI 1.72–127.31). Conclusions These data indicate that cigarette smoking is not an independent risk factor of CIN2+, but the increased risk ascribed to
smoking is mediated by acquisition of HR-HPV, of which current smoking was an independent predictor in multivariate model. 相似文献
96.
Joanna Lewek Krzysztof Kaczmarek Evgeniy Pokushalov Alexandr Romanov Iwona Cygankiewicz Pawel Ptaszynski 《Cardiovascular therapeutics》2015,33(3):141-144
Catheter‐based renal denervation (RDN) is a novel invasive approach in the treatment of resistant hypertension. It is considered a minimally invasive and safe procedure which, as shown by initial experimental and clinical trials, is able not only to reduce blood pressure but also to modify its risk factors by modulation of autonomic nervous system. Recently published results of a randomized Symplicity HTN‐3 trial, which failed to demonstrate RDN‐induced reduction of blood pressure at six months, decreased the initial enthusiasm regarding RDN and raised a question about real efficacy of this procedure. Nevertheless, still there are some other conditions characterized by increased sympathetic tone such as heart failure, atrial fibrillation, or ventricular arrhythmias that may benefit from RDN. Furthermore, novel therapeutical approach toward RDN using adapted electrophysiological or new specially designed electrodes may improve effectiveness of RDN procedure. 相似文献
97.
Emergency and pre‐surgical band deflation in patients with laparoscopic adjustable gastric bands: variations in practice 下载免费PDF全文
98.
Tomas Pokrivcak Radek Lakomy Tomas Kazda Alexandr Poprach Pavel Fabian Igor Kiss 《Medicine》2021,100(24)
Rationale:The use of cisplatin in patients with chronic kidney disease (CKD) is risky and depends on a number of factors. The optimal procedure in stage I of a non seminomatous germ cell tumor without proven lymphangioinvasion after orchiectomy is controversial and is the subject of a number of discussions due to the lack of randomized studies assessing individual treatment options. The adjuvant method of choice is surveillance or application of cisplatin-based chemotherapy with the risk of treatment related nephrotoxicity. Information about cisplatin safety in renal transplant patients is particularly limited. The aim of this paper is to share the experience with the application of adjuvant chemotherapy Bleomycin, Etoposide, Cisplatin (BEP) in high-risk patient with nonseminoma after kidney transplantation.Patient concerns:We report a case report of rare group of high-risk patient with non-seminomatous germ cell testicular tumor (NSGCT) after kidney transplantation before application of adjuvant chemotherapy BEP. Patient presented with month-long discomfort in the scrotal area. Previously, he was treated with chronic kidney disease based on chronic glomerulonephritis, which was treated with repeated kidney transplantation.Diagnosis:The ultrasound examination for a month-long discomfort in the scrotal area found a solid mass of the left testis. Radical inguinal orchiectomy confirmed NSGCT with the presence of lymphovascular invasion (LVI). Postoperative staging with computed tomography of the chest and abdomen did not show obvious dissemination of the disease.Interventions:Reducing original dose of chemotherapeutics according to the recommendations of the summary of product characteristics led to only a transient increase in creatinine levels.Outcomes:The 5-year risk of relapse in surveillance was reduced to around 3% by applying cisplatin-based chemotherapy.Lessons:Application of cisplatin-based chemotherapy is safe and effective in patients with CKD and in patients with a kidney transplant. 相似文献
99.
Marisa Almuzara German Matías Traglia Lenka Krizova Claudia Barberis Sabrina Monta?a Romina Bakai Alicia Tuduri Carlos Vay Alexandr Nemec María Soledad Ramírez 《Journal of clinical microbiology》2015,53(1):349-351
A taxonomically unique bacterial strain, Acinetobacter sp. A47, has been recovered from several soft tissue samples from a patient undergoing reconstructive surgery owing to a traumatic amputation. The results of 16S rRNA, rpoB, and gyrB gene comparative sequence analyses showed that A47 does not belong to any of the hitherto-known taxa and may represent an as-yet-unknown Acinetobacter species. The recognition of this novel organism contributes to our knowledge of the taxonomic complexity underlying infections caused by Acinetobacter. 相似文献
100.
Evgeny Pokushalov Alexander Romanov Alexander Chernyavsky Petr Larionov Igor Terekhov Sergey Artyomenko Olga Poveshenko Elena Kliver Natalya Shirokova Alexandr Karaskov Nabil Dib 《Journal of cardiovascular translational research》2010,3(2):160-168
Intramyocardial transplantation of autologous bone marrow mononuclear cells (BMMC) is believed to be a promising method for the treatment of patients with chronic ischemic heart disease. The aim of this study was to evaluate long-term results of intramyocardial bone marrow cell transplantation in patients with severe ischemic heart failure. One hundred nine patients with chronic myocardial infarction and end-stage chronic heart failure were randomized into two groups: 55 patients received intramyocardial BMMC injection and 54 received optimal medical therapy. The NOGA system (Biosense-Webster) was used to administer 41?±?16?×?106 BMMC into the border zone of myocardial infarction. None of the patients developed periprocedural complications following BMMC injections. The injections led to improvement of CCS class (3.1?±?0.4 to 1.6?±?0.6 after 6 months and 1.6?±?0.4 after 12 months; p?=?0.001) and NYHA functional class (3.3?±?0.2 to 2.3?±?0.2 after 6 months and 2.5?±?0.1 after 12 months; p?=?0.006). Left ventricular ejection fraction increased significantly in the BMMC group (27.8?±?3.4% vs 32.3?±?4.1%; p?=?0.04) while it tended to decrease in the control group (26.8?±?3.8% to 25.2?±?4.1%; p?=?0.61). Summed rest score improved in the BMMC group after 12 months (30.2?±?5.6 to 27.8?±?5.1; p?=?0.032). The improvement of stress score was more noticeable (34.5?±?5.4 to 28.1?±?5.2; p?=?0.016). Neither stress nor rest score changed in patients numbers on medical therapy. In BMMC group 6 (10.9%) patients died at 12-month follow-up compared with 21 (38.9%) in control group (log-rank test, p?=?0.0007). Intramyocardial bone marrow cell transplantation to patients with ischemic heart failure is safe and improved survival, clinical symptoms, and has beneficial effect on LV function 相似文献