全文获取类型
收费全文 | 19580篇 |
免费 | 1091篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 178篇 |
儿科学 | 580篇 |
妇产科学 | 803篇 |
基础医学 | 2533篇 |
口腔科学 | 511篇 |
临床医学 | 1746篇 |
内科学 | 3902篇 |
皮肤病学 | 428篇 |
神经病学 | 2009篇 |
特种医学 | 1248篇 |
外国民族医学 | 3篇 |
外科学 | 2732篇 |
综合类 | 142篇 |
一般理论 | 38篇 |
预防医学 | 1217篇 |
眼科学 | 228篇 |
药学 | 1219篇 |
中国医学 | 25篇 |
肿瘤学 | 1187篇 |
出版年
2021年 | 225篇 |
2020年 | 161篇 |
2019年 | 232篇 |
2018年 | 329篇 |
2017年 | 224篇 |
2016年 | 282篇 |
2015年 | 314篇 |
2014年 | 480篇 |
2013年 | 610篇 |
2012年 | 916篇 |
2011年 | 969篇 |
2010年 | 517篇 |
2009年 | 528篇 |
2008年 | 730篇 |
2007年 | 857篇 |
2006年 | 942篇 |
2005年 | 825篇 |
2004年 | 750篇 |
2003年 | 779篇 |
2002年 | 733篇 |
2001年 | 682篇 |
2000年 | 708篇 |
1999年 | 523篇 |
1998年 | 354篇 |
1997年 | 290篇 |
1996年 | 208篇 |
1995年 | 190篇 |
1994年 | 159篇 |
1993年 | 209篇 |
1992年 | 366篇 |
1991年 | 322篇 |
1990年 | 357篇 |
1989年 | 369篇 |
1988年 | 322篇 |
1987年 | 342篇 |
1986年 | 306篇 |
1985年 | 286篇 |
1984年 | 201篇 |
1983年 | 182篇 |
1982年 | 132篇 |
1981年 | 133篇 |
1979年 | 209篇 |
1978年 | 139篇 |
1977年 | 137篇 |
1976年 | 139篇 |
1975年 | 175篇 |
1974年 | 173篇 |
1973年 | 147篇 |
1972年 | 149篇 |
1970年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
C. Specker S. Bläß C. Meier H.-J. Lakomek M. Schwochau M. Schneider 《Zeitschrift für Rheumatologie》1997,56(2):63-70
Zusammenfassung Die Diagnostik vieler rheumatischer Systemerkrankungen wird heute durch den Nachweis von Autoantik?rpern unterstützt und
erleichtert. Für die Serodiagnostik der Rheumatoiden Arthritis (RA) stehen nur die doch wenig spezifischen Rheumafaktoren
zur Verfügung. Mit dem Ziel, neue krankheitsspezifische Autoantik?rper nachzuweisen, erfolgte eine besondere Proteinaufarbeitung
aus Synovialisbiopsien und anderen Geweben. Western Blots der gewonnenen Proteine wurden eingesetzt, um Seren von RA-Patienten
und solchen mit anderen rheumatischen Erkrankungen zu untersuchen. Die signifikanteste Immunreaktion von RA-Patienten richtete
sich gegen ein 68k-Antigen, welches vermutlich ubiquit?r exprimiert wird, da es nicht nur in Synovialis, sondern in allen
weiteren untersuchten Humangeweben und HeLa-Zellen nachgewiesen werden konnte. Der isoelektrische Punkt liegt bei 5,1, das
Protein ist O-glykosyliert und im endoplasmatischen Retikulum und/oder Cytoplasma lokalisiert. Antik?rper gegen dieses 68k-Antigen
waren bei 110 von 167 RA-Patienten nachzuweisen, was einer Sensitivit?t von 66% entspricht. Ihr Vorkommen war unabh?ngig vom
Rheumafaktornachweis, da sie auch bei 7 von 12 seronegativen RA-Patienten zu finden waren, dagegen nur bei einem Patienten
aus einer Kontrollgruppe von 98 Patienten mit anderen rheumatologischen Krankheitsbildern, bei einem von 22 HIV-Patienten
und überhaupt nicht bei 55 Gesunden. Daraus resultiert eine RA-Spezifit?t für diesen Antik?rper von 99%. Wegen der auff?lligen
Krankheitsspezifit?t der anti-68k-Antik?rper liegt es nahe, nach korrespondierenden autoreaktiven T-Zellen zu suchen, um
die Rolle dieser neuen Autoreaktivit?t in dem Pathomechanismus der RA zu analysieren.
Eingegangen: 20. Mai 1996 Akzeptiert: 13. Februar 1997 相似文献
42.
Treatment of rat heart grafts with PUVA, the combination of the photosensitizer 8-methoxypsoralen and longwave ultraviolet light, leads to a prolonged transplant survival in allogeneic recipients. A PUVA treatment of the recipient rats, performed for 7 consecutive days after transplantation, prolonged graft survival even more effectively. This may be due to the systemic immunomodulatory effects of PUVA in the recipient. One of the mediators is urocanic acid, which is transformed by ultraviolet light in the skin from its trans- to the cis-isomer, which, in turn, acts as a mediator on the immune system. An injection of cisurocanic acid into graft recipients for 7 consecutive days after transplantation resulted in prolonged graft survival; in 40% of the rats, permanent graft acceptance was observed. The significance of these results for clinical organ transplantation is discussed. 相似文献
43.
Dr Arthur J. L. Schneider MD W. Bosseau Murray MBChB MD Steven C. Mentzer BS Fernando Miranda BS Sorin Vaduva MS 《Journal of clinical monitoring and computing》1995,11(6):358-364
Objective. The medical practitioner is faced with an increasing list of protocols and algorithms related to patient care. These recommendations are often difficult to recall, particularly in stressful emergency situations. Using advanced cardiac life support (ACLS) protocols, we built a computer-based system to exhibit precompiled response plans for medical emergencies. To validate the usefulness of this prompting device, we tested application of two of the nine ACLS algorithms, pulseless ventricular fibrillation/ventricular tachycardia (Vfib/Vtach) and bradycardia, in a simulated operating room (OR) environment.Methods. The system utilized the software authoring system IconAuthor (Aimtec Inc., Nashua, NH) and a touch-screen monitor (DiamondScan, Microtouch, Methuen, MA). Prior to testing our system, all 39 subjects were given time to familiarize themselves with its operation. Subsequently, all subjects were videotaped while managing a standard simulated anesthetic. During the anesthetic, the subjects were presented with two emergency scenarios, not viewed during the familiarization period. The electrocardiographic (EKG) signals for normal sinus rhythm, ventricular fibrillation, and second-degree heart block were presented. By random selection, the prompter was available to half of the subjects for help with arrhythmia management (experimental group), while to half it was not (control group).Results. A total of 39 subjects completed the exercise. Use of the prompter enabled significantly more subjects to administer correct drugs and dosages during ventricular fibrillation. The correct lidocaine dose was chosen more often by the experimental group than by the control (p=0.015); similarly MgSO4 was appropriately ordered more often in the experimental group (p=0.003). During second-degree heart block, atropine was correctly followed with a dopamine infusion (p=0.004), and epinephrine infusion was ordered for refractory bradycardia (p=0.002) more often in the experimental than the control group.Conclusions. These data demonstrate the value of a prompting device at the anesthesia workstation. We foresee the use of such prompters in many areas of medicine.This study was made possible by a grant from the Anesthesia Patient Safety Foundation. Results were presented, in part, at the meeting of the STA/SEA Orlando, Florida, January 1994. 相似文献
44.
45.
46.
47.
Hermann J Girschick Etienne Mornet Meinrad Beer Monika Warmuth-Metz Peter Schneider 《BMC pediatrics》2007,7(1):3
Background
Hypophosphatasia (HP) is characterized by a genetic defect in the tissue-nonspecific alkaline phosphatase (TNSALP) gene and predominantly an autosomal recessive trait. HP patients suffer from reduced bone mineralization. Biochemically, elevated concentrations of substrates of TNSALP, including pyridoxal-5'-phosphate and inorganic pyrophosphate occur in serum, tissues and urine. The latter has been associated with chronic inflammation and hyperprostaglandinism. 相似文献48.
Claudia St?llberger Josef Finsterer Birke Schneider 《Journal of the American College of Cardiology》2006,47(7):1500; author reply 1500-1500; author reply 1501
49.
50.
Ira R Katz Marcia Rupnow Chris Kozma Lon Schneider 《The American journal of geriatric psychiatry》2004,12(5):499-508
OBJECTIVE: Authors evaluated the association between use/dosage of risperidone (RIS) and falls in a residential-care dementia population. METHODS: Authors performed secondary analysis of data from ambulatory patients in a randomized, double-blind, placebo-controlled, 12-week trial of three RIS dosages (0.5 mg/day, 1 mg/day, 2 mg/day). Outcomes included number of fallers, rate of falls, and time until the first fall after randomization. Additional analyses evaluated wandering as a potential moderating or mediating variable. RESULTS: The ambulatory sample included 537 subjects. Of those, 22.3% on placebo, 18.0% on RIS 0.5 mg/day, 12.7% on 1 mg/day, and 27.3% on 2 mg/day, respectively, fell during the trial. The difference between the RIS 1 mg/day group and placebo was significant, with a significantly lower hazard ratio in the RIS 1-mg/day group than placebo. Wandering was associated with an increased risk of falls. Among 205 patients with the highest levels of wandering at baseline, RIS 1 mg/day was associated with approximately a 70% reduction in risk for falls versus placebo condition. However, in those with the lowest levels of wandering at baseline, RIS 2 mg/day may have increased the risk of falls. CONCLUSIONS: Evaluating the benefits versus risks of risperidone in patients with dementia is complex and must consider multiple outcomes as a function of dose. At 1 mg/day, RIS was associated with decreased falls, especially in patients who exhibit wandering. However, at 2 mg/day, it may increase the risk of falls in ambulatory individuals with low levels of wandering. 相似文献