全文获取类型
收费全文 | 6906篇 |
免费 | 216篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 240篇 |
儿科学 | 136篇 |
妇产科学 | 294篇 |
基础医学 | 838篇 |
口腔科学 | 49篇 |
临床医学 | 445篇 |
内科学 | 1838篇 |
皮肤病学 | 128篇 |
神经病学 | 611篇 |
特种医学 | 113篇 |
外科学 | 740篇 |
综合类 | 59篇 |
一般理论 | 10篇 |
预防医学 | 327篇 |
眼科学 | 199篇 |
药学 | 734篇 |
中国医学 | 4篇 |
肿瘤学 | 395篇 |
出版年
2023年 | 27篇 |
2022年 | 176篇 |
2021年 | 260篇 |
2020年 | 72篇 |
2019年 | 135篇 |
2018年 | 151篇 |
2017年 | 113篇 |
2016年 | 124篇 |
2015年 | 164篇 |
2014年 | 210篇 |
2013年 | 323篇 |
2012年 | 448篇 |
2011年 | 568篇 |
2010年 | 277篇 |
2009年 | 185篇 |
2008年 | 448篇 |
2007年 | 544篇 |
2006年 | 496篇 |
2005年 | 534篇 |
2004年 | 521篇 |
2003年 | 453篇 |
2002年 | 397篇 |
2001年 | 27篇 |
2000年 | 30篇 |
1999年 | 32篇 |
1998年 | 30篇 |
1997年 | 18篇 |
1996年 | 24篇 |
1995年 | 33篇 |
1994年 | 21篇 |
1993年 | 18篇 |
1992年 | 15篇 |
1991年 | 21篇 |
1990年 | 10篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 18篇 |
1986年 | 11篇 |
1985年 | 15篇 |
1984年 | 23篇 |
1983年 | 19篇 |
1982年 | 25篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1979年 | 21篇 |
1978年 | 12篇 |
1977年 | 8篇 |
1975年 | 6篇 |
1974年 | 8篇 |
1973年 | 8篇 |
排序方式: 共有7160条查询结果,搜索用时 15 毫秒
71.
Bartomiej Samociuk Daniel Medyski Daniel Nowak Joanna Kawa-Rygielska Kacper
wiechowski Alan Gasiski Andrzej Janus 《Materials》2022,15(9)
The aim of this study was to attempt to use barley malt as a natural, organic binder in the technology of molding sand. TGA analysis of the binder was performed, during which temperatures of thermal decomposition of its components were determined. The results of TG/DTG analysis show that a loss of ~75% of mass of the MB binder is organic matter. Over 50% of this is starch. The results indicate the possibility of using a binder made of barley malt as a binding material for quartz sand grains. This fact was confirmed by tests carried out with use of SEM. During the observations, it was found that barley malt forms smooth bridges connecting individual grains of quartz sand. The typical properties of molding sands with barley malt were also determined, compared to sands containing commonly used binders. At the same time, the influence of the content of this binder on flowability, permeability, strength properties, and wear resistance was assessed. It has been found that increasing the binder content in molding mass results in an increase in strength and wear resistance, as opposed to flowability and permeability. Test castings were also made. It was found that the addition of a binder made of barley malt has a positive effect on the surface quality of castings. This was confirmed by roughness measurements of the test castings. At the same time, a tendency to excessive gas evolution during pouring was shown, with higher contents of this binder. Moreover, greater amounts of barley malt in the molding sand (MB 5%) as compared to the lower content (MB 2%) increased the thickness of the burnt layer of the sand by 25%. This is due to the exothermic reaction when more binder is burnt. It is extremely important from the point of view of the regeneration of molding sand. 相似文献
72.
Andrzej Nowicki Zbigniew Trawinski Barbara Gambin Wojciech Secomski Michał Szubielski Marzena Parol Robert Olszewski 《Ultrasound in medicine & biology》2018,44(6):1187-1197
A high-frequency scanning system consisting of a 20-MHz linear array transducer combined with a 20-MHz pulsed Doppler probe was introduced to evaluate the degree of radial artery flow-mediated dilation (FMD [%]) in two groups of patients after 5?min of controlled forearm ischemia followed by reactive hyperemia. In group I, comprising 27 healthy volunteers, FMD (mean?±?standard deviation) was 15.26?±?4.90% (95% confidence interval [CI]: 13.32%–17.20%); in group II, comprising 17 patients with chronic coronary artery disease, FMD was significantly less at 4.53?±?4.11% (95% CI: 2.42%–6.64%). Specifically, the ratio FMD/SR (mean?±?standard deviation), was equal to 5.36?×?10?4?±?4.64?×?10?4 (95% CI: 3.54?×?10?4 to 7.18?×?10?4) in group I and 1.38?×?10?4?±?0.89?×?10?4 (95% CI: 0.70?×?10?4 to 2.06?×?10?4) in group II. Statistically significant differences between the two groups were confirmed by a Wilcoxon–Mann–Whitney test for both FMD and FMD/SR (p?<0.01). Areas under receiver operating characteristic curves for FMD and FMD/SR were greater than 0.9. The results confirm the usefulness of the proposed measurements of radial artery FMD and SR in differentiation of normal patients from those with chronic coronary artery disease. 相似文献
73.
74.
75.
IB de Groot AM Stiggelbout PJ van der Boog AG Baranski PJ Marang-van de Mheen;for the PARTNER-study group 《Transplant international》2012,25(9):967-975
Health related quality of life (HRQoL) of living kidney donors on average is good, but some donors experience a low HRQoL after donation. This study assessed the prevalence of reduced HRQoL and explored associations with pre‐ and post‐donation variables. 316 donors (response rate 74%) who donated a kidney between 1997 and 2009 filled in a questionnaire. HRQoL was measured using the Short‐Form 36; fatigue using the Multidimensional Fatigue Inventory; societal participation using the Utrecht Scale for Evaluation of Rehabilitation‐Participation. Donors on average had better HRQoL than the general population. However, 12% had a reduced physical (PCS) and 18% a reduced mental (MCS) HRQoL. Donors with reduced HRQoL reported greater fatigue (P < 0.01), lower societal participation (P < 0.01) and showed a trend towards statistical significance in experiencing more donor–recipient relationship changes (P = 0.07). Prior to donation, donors with reduced PCS had a higher BMI (P < 0.05) and more often smoked (P < 0.05). Donors with reduced MCS had higher expectations (P < 0.05). Reduced HRQoL is associated with higher BMI, smoking and higher expectations prior to donation. These results may be used to develop a screening instrument to select donors at high risk for reduced HRQoL. 相似文献
76.
Beata Krasińska MD PhD Maciej Banach PhD Małgorzata Karolczak-Kulesza MD PhD Zbigniew Krasiński PhD Jerzy Głuszek PhD Andrzej Tykarski PhD 《Journal of clinical hypertension (Greenwich, Conn.)》2012,14(10):701-710
J Clin Hypertens (Greenwich). 2012;14:701–710. ©2012 Wiley Periodicals, Inc. The authors aimed to determine the effect of the time of hypotensive drug administration on the progress of degenerative changes within the optic nerve in patients with hypertension and glaucoma. Two groups were included in the study: group A comprised patients-dippers taking drugs in the mornings, and group B comprised patients-nondippers taking drugs both in the mornings and in the evenings. After 6 months, group B showed significant drops in nocturnal diastolic blood pressure (BP) (month 1=73.27 mm Hg vs month 6=67.50 mm Hg), nocturnal mean BP (89.34 vs 84.65 mm Hg), and minimum diastolic BP (50.74 vs 44.03 mm Hg). Group B also showed significant reductions in nocturnal ocular perfusion pressure (43.0 vs 39.73), retinal nerve fiber layer thickness (131.31 vs 113.12 μm), and flow in the eye vessels. Taking hypotensive drugs in the evening may significantly decrease blood flow in the eye arteries, cause degenerative changes within the optic nerves, and result in greater loss in the field of vision. 相似文献
77.
78.
Jagoda Abramek Jacek Bogucki Marta Ziaja-Sołtys Andrzej Stępniewski Anna Bogucka-Kocka 《Pharmacological reports : PR》2019,71(2):248-256
Background
Sodium dichloroacetate (DCA) is an agent with anticancer properties against solid tumors. DCA also seems to have antileukemic activity. In order to affirm it we investigate the effect of DCA on cell viability and apoptotic gene expression profiles in leukemia cell lines: CEM/C1, CCRF/CEM, HL-60, HL-60/MX2.Methods
Cell viability was assessed by trypan blue staining. The expression of 93 genes involved in the process of apoptosis was determined by real-time PCR method using Taqman Low Density Array (TLDA).Results
CEM/C1, CCRF/CEM, HL-60, HL-60/MX2 cells were exposed to DCA for 24?h. The sensitivity of each cell line to DCA is different and depends on the concentration. CEM/C1 was the most sensitive with an half-maximal inhibitory concentration (IC50) value of 30?mM, while HL-60/MX2 was the most resistant with an IC50 value of 75?mM. Exposure of leukemia cells to DCA causes differences in gene expression profiles which cannot indicate that any particular pathway of apoptosis is initiated. However, the presence of 388 statistically significant correlations between expression pattern of gens was determined.Conclusion
We showed that DCA causes a decrease in viability of leukemia cells. The decline depends on DCA concentration. The induction of any particular apoptosis pathway is not shown in cells after DCA treatment. For that reason, studies on the molecular mechanism of cell death after exposure to DCA should be continued. 相似文献79.
Robert Rogulski Anna Adamowicz‐Salach Michał Matysiak Dariusz Piotrowski Michał Gogolewski Anna Piotrowska Danuta Roik Andrzej Kamiński 《European journal of haematology》2016,96(6):637-642
Splenectomy is considered standard surgical therapy in hereditary spherocytosis. The procedure is indicated in patients with severe anemia, recurrent hemolytic, and aplastic crises. The aim of the study was to assess treatment outcomes in patients with hereditary spherocytosis who underwent total or partial laparoscopic splenectomy. Fifteen patients aged 4–17 yr underwent laparoscopic splenectomy from 2009 to 2012. Partial and total splenectomies were performed (five and 10 children, respectively). Hematologic parameters, liver function tests, and splenic volume before and after the surgery were analyzed retrospectively. Total follow‐up was 1–30 months. Hospitalization and operating time were similar in both groups. In partial splenectomy group, branches of splenic arteries gave better blood supply than short gastric vessels. In both groups, hematologic parameters were improved. Postoperative markedly elevated platelet count was maintained up to 6 months, and after that, platelet count gradually decreased to normal values. Bilirubin level was decreased in early postoperative period; however, it increased later to achieve levels lower than in preoperative period. No severe general infections were observed in both groups. Laboratory parameters (hemoglobin and bilirubin concentrations and RBC) after the surgery improved in all patients, and the effect was maintained during 12 months of follow‐up. Platelet count increased significantly after the surgery and was maintained at high levels during the next 6 months. However, it returned to preoperative levels within a year after the surgery. Our study showed that partial splenectomy was not inferior to total splenectomy. However, full assessment requires longer follow‐up and larger group of patients. 相似文献
80.
Wróbel Andrzej Doboszewska Urszula Rechberger Ewa Rojek Karol Serefko Anna Poleszak Ewa Skalicka-Woźniak Krystyna Dudka Jarosław Wlaź Piotr 《Naunyn-Schmiedeberg's archives of pharmacology》2017,390(6):613-619
Naunyn-Schmiedeberg's Archives of Pharmacology - Hemorrhagic cystitis often develops in patients treated with cyclophosphamide (CYP). Studies have indicated that Rho kinase (ROCK) inhibitors... 相似文献