全文获取类型
收费全文 | 4759篇 |
免费 | 191篇 |
国内免费 | 43篇 |
专业分类
耳鼻咽喉 | 188篇 |
儿科学 | 170篇 |
妇产科学 | 328篇 |
基础医学 | 607篇 |
口腔科学 | 72篇 |
临床医学 | 294篇 |
内科学 | 872篇 |
皮肤病学 | 121篇 |
神经病学 | 378篇 |
特种医学 | 101篇 |
外科学 | 398篇 |
综合类 | 83篇 |
一般理论 | 1篇 |
预防医学 | 343篇 |
眼科学 | 162篇 |
药学 | 583篇 |
中国医学 | 27篇 |
肿瘤学 | 265篇 |
出版年
2023年 | 20篇 |
2022年 | 96篇 |
2021年 | 176篇 |
2020年 | 66篇 |
2019年 | 88篇 |
2018年 | 138篇 |
2017年 | 100篇 |
2016年 | 116篇 |
2015年 | 128篇 |
2014年 | 189篇 |
2013年 | 211篇 |
2012年 | 326篇 |
2011年 | 359篇 |
2010年 | 180篇 |
2009年 | 146篇 |
2008年 | 224篇 |
2007年 | 281篇 |
2006年 | 311篇 |
2005年 | 295篇 |
2004年 | 269篇 |
2003年 | 265篇 |
2002年 | 211篇 |
2001年 | 94篇 |
2000年 | 99篇 |
1999年 | 89篇 |
1998年 | 32篇 |
1997年 | 18篇 |
1996年 | 15篇 |
1994年 | 13篇 |
1992年 | 19篇 |
1991年 | 20篇 |
1990年 | 16篇 |
1989年 | 25篇 |
1988年 | 28篇 |
1987年 | 13篇 |
1986年 | 27篇 |
1985年 | 13篇 |
1983年 | 12篇 |
1980年 | 11篇 |
1979年 | 18篇 |
1978年 | 17篇 |
1977年 | 11篇 |
1975年 | 15篇 |
1974年 | 19篇 |
1973年 | 17篇 |
1972年 | 23篇 |
1971年 | 18篇 |
1969年 | 20篇 |
1968年 | 18篇 |
1967年 | 11篇 |
排序方式: 共有4993条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
Ma?gorzata Pawelec-Wojtalik Ludwig Karl von Segesser Ma Liang Dorota Bukowska 《European journal of cardio-thoracic surgery》2005,27(4):714-716
Growing experience in interventional cardiology leads to the use of large diameter of vascular equipment. In some instances, the so-called hybrid procedures are performed. After performing the interventional procedure, the opening in ventricular wall is closed surgically. Our intention was to check if the MVSDO can be used to close the perforation in the heart after the interventional cardiology procedure performed through the left ventricular (LV) free wall. In three pigs under general anesthesia, the heart was exposed through a small substernal incision. The LV was punctured and an 18F sheath was introduced into the LV. A 14 mm MVSDO was inserted through the 10F Delivery System. Using both the echocardiographic and angiographic guidance, the MVSDO was placed on the LV wall to close the opening in the LV. Time and volume of bleeding was recorded. In all cases the occluder was successfully placed closing the opening, bleeding observed after deployment of occluder lasted for approximately 2 min. We think MVSD occluder can be used to close the LV free wall perforation after hybrid interventional cardiac procedure. Early bleeding through MVSDO might be resolved by the manufacturing of new occluder with better sealing properties. 相似文献
6.
M Grabarczyk J Wo?niak U Podstawka J Kope?-Szlezak 《Materia medica Polona. Polish journal of medicine and pharmacy》1990,22(3):184-187
After lindane administration in daily doses of 0.1 LD50 for one month (total dose 2.0 LD50) changes in the erythrocytes were found persisting for up to 4 months after withdrawal of the pesticide. A significant increase in the number of echinocytes, a greater per cent of reticulocytes, significantly raised level of denatured haemoglobin, and an increased number of erythrocytes of higher sensitivity to oxidating factors in relation to control group was observed. 相似文献
7.
Violence at the workplace--a questionnaire survey of nurses. 总被引:2,自引:0,他引:2
Dorota Merecz Joanna Rymaszewska Agnieszka Mo?cicka Andrzej Kiejna Joanna Jarosz-Nowak 《European psychiatry》2006,21(7):442-450
BACKGROUND: In the health sector, anywhere in the world nurses are one of the most exposed groups to violence. However, it is not obvious that psychiatric nurses (PNs) are more exposed to aggression and burnout. OBJECTIVES: To determine the nature and effects of aggressive acts towards nursing staff in psychiatric and other medical services in Poland. METHODS: Various questionnaires (Stress at Work Scale, General Health Questionnaire, Maslach Burnout Inventory, Work Satisfaction Scale), were distributed among psychiatric (N=78) and non-psychiatric nurses (N-PNs) (N=335). A 92.6% response rate was achieved. RESULTS: Significant differences were found between PNs and non-psychiatric counterparts with respect to their experiences of violence. The most frequently reported incident was verbal abuse, followed by threats and physical assault. Patients were significantly more frequent perpetrators in psychiatric wards than in others. The level of intra-staff aggression did not significantly vary between groups, neither did the level of work satisfaction and absenteeism. CONCLUSION: The frequency of violent acts and stress related to them point out the strong need for the development of preventive programs to address the issue of violence at work. 相似文献
8.
Ewa Andrzejewska Maciej Andrzejewski Elzbieta Socha Dorota Zych-Tomkowiak 《Dental materials》2003,19(6):501-509
OBJECTIVES: Resin-modified glass ionomer cements (RMGI) are hybrid materials prepared by incorporation of polymerizable components (typically 2-hydroxyethyl methacrylate (HEMA) with possible addition of multifunctional methacrylates) into a conventional acid-base mixture (a polymeric acid with powdered calcium fluoro-aluminosilicate glasses). During setting, the photopolymerization process and the acid-base reaction affect each other. The aim of this work was to examine the effect of a 45% aqueous solution of poly(acrylic acid) (PAA) and the liquid component of a commercial glass ionomer cement on HEMA and triethyleneglycol dimethacrylate (TEGDMA) photopolymerization. METHODS: The polymerization was initiated by 2,2-dimethoxy-2-phenylacetophenone (DMPA) and camphorquinone (CQ)/coinitiator system. The reaction course was monitored under Ar and air by isothermal differential scanning calorimetry. RESULTS: The main effect of addition of polyacid solution (PAA and commercial) up to 10wt% to HEMA on the polymerization initiated with DMPA was earlier onset of autoacceleration. For the process initiated by the CQ-based system, the addition of 5wt% of PAA solution strongly accelerated the polymerization and increased the conversion, both in Ar atmosphere as well as in air. TEGDMA photopolymerization was not influenced or slightly retarded by the presence of 3wt% of PAA solution (the upper limit of solubility), depending on the initiating system used. SIGNIFICANCE: Under initiation conditions used in curing of commercial dental products (CQ-based two component initiating system), the presence of polyacid-aqueous solution in HEMA-based photocurable component increases markedly the polymerization rate and the conversion both in Ar atmosphere as well as in air. This result contributes to a characterization of the setting process of RMGIs. 相似文献
9.
The aim of the study was the investigation of the biochemical condition of elements likely to directly participate in active
closing of the urethral lumen. We estimated glycogenolysis in urinary bladder, perivesical connective tissue and levator ani
muscle (LAM) samples obtained intraoperatively from 80 stress incontinent women. Glycogen content as well as activities of
active and total glycogen phosphorylase and acid exo-1,4-alpha-glucosidase were measured. Material from the urinary bladder
and perivesical connective tissue was insignificantly altered, and glycogen contents in the bladder (2.03±1.38 g/100 g wet
tissue) were considered to be normal. In the LAM glycogenolysis was much more activated than in other tissues (p<0.001 by
Fischer's exact test). Of LAM specimens 78% (22/28) revealed imbalanced biochemistry of glycogen with activation of hydrolytic
decomposition. We conclude that stress urinary incontinence in women is frequently associated with metabolic alterations in
the periurethral striated fibres. This study indirectly supports our recent hypothesis on the pathogenesis of the disease
in terms of muscle fibre type transitions. 相似文献
10.
Z Kwias P Nowakowski W Skorupski W Wo?niak P Strzyzowski B Nowakowski 《Ginekologia polska》1992,63(10):539-542
The article presents an analysis of 21 patients with ureter injuries originated during obstetric-gynaecological operations treated in Urology Clinic in Medical Academy Poznań. Attention was particularly focused on prevention and fast diagnosis of injuries based on intra-operation examination usg, urography, and ascending pyelography. This fast diagnosis is of crucial importance for the cure. 相似文献