全文获取类型
收费全文 | 167篇 |
免费 | 3篇 |
专业分类
儿科学 | 7篇 |
妇产科学 | 1篇 |
基础医学 | 12篇 |
口腔科学 | 5篇 |
临床医学 | 35篇 |
内科学 | 33篇 |
皮肤病学 | 5篇 |
神经病学 | 5篇 |
外科学 | 25篇 |
预防医学 | 5篇 |
眼科学 | 13篇 |
药学 | 23篇 |
肿瘤学 | 1篇 |
出版年
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 1篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 3篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2003年 | 3篇 |
2001年 | 3篇 |
1999年 | 7篇 |
1998年 | 7篇 |
1997年 | 7篇 |
1996年 | 9篇 |
1995年 | 4篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1965年 | 2篇 |
1963年 | 1篇 |
1959年 | 5篇 |
1958年 | 16篇 |
1957年 | 6篇 |
1956年 | 7篇 |
1955年 | 6篇 |
1954年 | 2篇 |
1949年 | 1篇 |
1948年 | 1篇 |
1937年 | 1篇 |
排序方式: 共有170条查询结果,搜索用时 15 毫秒
1.
2.
A peptide hydropathically complementary to Big Endothelin [Big ET] residues 16-29 has been synthesized in a multimeric form starting from an octadentate poiylysine core, essentially in a way similar to the procedure used for the production of multiple antigenic peptides [MAP's], Interaction between the multimeric complementary peptide [8δET] and the Big ET fragment 16-32 containing the target complementary region, also synthesized in a multimeric form [8ET], was evaluated by analytical high performance affinity chromatography and solid phase binding assays. While the binding interaction between the monomerics peptide pair was in the micromolar range, the recognition between the corresponding multimeric form was characterized by enhanced binding affinity of at least two orders of magnitude. In solution, complex formation between multimeric complementary peptide and target Big ET sequence in the monomeric and multimeric form was accompanied by precipitation at concentrations higher than 0.5 mg/mL and 0.1 mg/mL, respectively. Polyclonal antibodies raised against the multimeric target sequence recognized multimeric and monomeric ET target sequences with binding affinities similar to binding affinities exhibited by the multimeric complementary peptide. Multimerization of hydropathically complementary peptides could provide an improved opportunity to measure and thus probe quantitative binding properties of complementary peptides. 相似文献
3.
MICHAEL VAWTER M.D. RICARDO RUIZ M.D. † ABDUL ALAAMA M.D. † WILBERT S. ARONOW M.D. ‡ ANGELO E. DAGRADI M.D. F.A.C.G. ‡ 《The American journal of gastroenterology》1975,63(2):155-157
Electrocardiographic abnormalities were observed in 15 of 23 patients (65%), five with known heart disease, who were monitored for one hour prior to, during and for one hour after coloscopy. In one patient, ischemic S-T depression, 2 mm. below the resting level, persisted during the one hour following coloscopy. In all other patients, the electrocardiographic abnormalities disappeared before the end of the monitoring period. 相似文献
4.
Bile lipid composition and haemostatic variables in a case of high density lipoprotein deficiency (Tangier disease) 总被引:1,自引:0,他引:1
CARLO G. VERGANI ANGELO C. PLANCHER MASSIMO ZUIN MARCO CATTANEO CASIMIRO TRAMALONI SERGIO MACCARI PAOLA ROMA ALBERICO L. CATAPANO 《European journal of clinical investigation》1984,14(1):49-54
A 62-year-old man with clinical and biochemical findings consistent with homozygous Tangier disease is presented. Widespread atherosclerosis was present. Bile lipid analysis showed a low molar percentage of cholesterol with a low saturation index. The data suggest that high density lipoprotein cholesterol may act as a preferential precursor of biliary cholesterol. Coagulation and platelet studies indicated that the patient's platelets were hyper-responsive to aggregating agents and produced an increased amount of thromboxane B2. A platelet storage pool deficiency was also found. 相似文献
5.
6.
MONICA DE MATTEI PHD ALESSIA ONGARO PHD SIMONA MAGALDI BS DONATO GEMMATI BS REA LEGNARO MD ANNUNZIATA PALAZZO MD FEDERICA MASIERI BS AGNESE PELLATI BS LINDA CATOZZI BS ANGELO CARUSO PHD PAOLO ZAMBONI MD 《Dermatologic surgery》2008,34(3):347-356
BACKGROUND Wound healing is a biologic process that is altered in patients affected by chronic venous ulcers. The wound microenvironment is reflected in the chronic wound fluid (CWF), an exudate containing serum components and tissue-derived proteins.
OBJECTIVES We investigated the effects of increasing doses of CWF collected from patients suffering from chronic venous ulcers on human adult dermal fibroblasts cultured in vitro and the relationship among CWF effects and treatment length.
METHODS Fibroblasts were treated with 60, 240, and 720 μg/mL CWF for 3 and 7 days. We evaluated cell proliferation and viability by MTT and Trypan blue assay, cell morphology by light microscopy, F-actin microfilaments organization by tetramethylrhodamine B isothiocyanate-conjugated phalloidin, α-smooth muscle actin expression by immunofluorescence, and senescence-associated β-galactosidase activity.
RESULTS CWF induced an increase in cell proliferation in the first 3 days of treatment. In contrast, at 7 days, a strong decrease in cell viability was observed. These changes were related to a cytoskeletal F-actin reorganization and not to fibroblast–myofibroblast differentiation nor to changes in cellular senescence.
CONCLUSIONS This study shows a dose-dependent and biphasic effect of CWF on dermal fibroblasts, suggesting that a continuous exposure to chronic wounds microenvironment may induce late cellular dysfunctions possibly involved in the delayed wound healing. 相似文献
OBJECTIVES We investigated the effects of increasing doses of CWF collected from patients suffering from chronic venous ulcers on human adult dermal fibroblasts cultured in vitro and the relationship among CWF effects and treatment length.
METHODS Fibroblasts were treated with 60, 240, and 720 μg/mL CWF for 3 and 7 days. We evaluated cell proliferation and viability by MTT and Trypan blue assay, cell morphology by light microscopy, F-actin microfilaments organization by tetramethylrhodamine B isothiocyanate-conjugated phalloidin, α-smooth muscle actin expression by immunofluorescence, and senescence-associated β-galactosidase activity.
RESULTS CWF induced an increase in cell proliferation in the first 3 days of treatment. In contrast, at 7 days, a strong decrease in cell viability was observed. These changes were related to a cytoskeletal F-actin reorganization and not to fibroblast–myofibroblast differentiation nor to changes in cellular senescence.
CONCLUSIONS This study shows a dose-dependent and biphasic effect of CWF on dermal fibroblasts, suggesting that a continuous exposure to chronic wounds microenvironment may induce late cellular dysfunctions possibly involved in the delayed wound healing. 相似文献
7.
EDWARD J. CIACCIO
Ph.D. ANGELO B. BIVIANO M.D. WILLIAM WHANG M.D. ANDREW L. WIT
Ph.D. JAMES COROMILAS M.D. HASAN GARAN M.D. 《Journal of cardiovascular electrophysiology》2010,21(2):133-143
Local Activation Rate in Atrial Fibrillation. Background: Complex fractionated atrial electrograms (CFAE) have become targets for catheter ablation of atrial fibrillation (AF). Frequency components of AF signals have also become important markers for identifying potential mechanisms of AF, yet inaccuracies exist, particularly in standard dominant frequency (SDF) calculations especially at CFAE sites. We developed new methodology to improve accuracy of AF rate determinations at such recording sites. Objective: To develop optimal methods for estimating activation rates in paroxysmal and persistent AF. Methods: Electrograms were obtained from one right atrial, coronary sinus, and 6 left atrial (LA) endocardial regions manifesting CFAEs in paroxysmal (N = 7) and persistent (N = 7) AF patients. SDF was measured from 8.4 s intervals and compared to (1) optimized DF (ODF) calculated by optimizing the filter coefficients which maximized dominant frequency power, (2) autocorrelation (AC), with the rate estimated as the inverse of the signal phase shift generating the largest autocorrelation coefficient, and (3) ensemble average (EA), with the rate estimated by summing successive signal segments and selecting segment length yielding maximum power. Rate measurements were compared between groups, at baseline and with additive interference, having similar frequency content to the electrograms, to test the robustness of the different methods. Results: From pooled data (N = 168 recording sites), a significantly higher LA dominant frequency was found in persistent versus paroxysmal patients using each method (P < 0.001), with a mean value for all methods of 6.23 ± 0.08 Hz versus 5.32 ± 0.10 Hz, respectively. At the highest additive interference level, the rate measurement error was significantly greater in SDF as compared with EA (P = 0.010) and ODF (P = 0.035), and at all interference levels SDF had the largest error of any method. Conclusions: SDF appears less robust to additive interference, compared to the ODF and EA methods of estimating the activation rate at CFAE sites in this small group of patients. Use of optimized filter coefficients for DF measurement, or use of correlative methods such as EA, that reinforce the signal rather than filtering the noise, may improve calculation of activation rates. (J Cardiovasc Electrophysiol, Vol. 21, pp. 133‐143, February 2010) 相似文献
8.
Clinical Evaluation of Morphology Discrimination: An Algorithm for Rhythm Discrimination in Cardioverter Defibrillators 总被引:3,自引:0,他引:3
GIUSEPPE BORIANI MAURO BIFFI LORENZO FRABETTI J. JOHN LATTUCA ANGELO BRANZI 《Pacing and clinical electrophysiology : PACE》2001,24(6):994-1001
The aim of this study was to test the new morphology discrimination diagnostic algorithm for ICDs that differentiates supraventricular tachycardias (SVTs) from VTs by analysis of ventricular depolarization complexes morphology. Twenty-five patients implanted with a St. Jude Ventritex single chamber ICD were studied during electrophysiological evaluation at predischarge and were followed for 7 +/- 4 months. Sensitivity and specificity for VT detection and overall diagnostic accuracy of the morphology discrimination algorithm were calculated on 326 detected events. At electrophysiological evaluation, the algorithm was tested during 67 episodes of right atrial pacing, during 119 episodes of RV pacing (at basal interventricular septum and RV apex) and during 27 episodes of sustained AF: specificity was 98%, sensitivity was 66%, and diagnostic accuracy was 80%. All episodes of AF were correctly diagnosed as SVT. Exclusion of detections related to pacing at the basal interventricular septum, resulted in a specificity of 98%, a sensitivity of 85%, and a diagnostic accuracy of 93%. During follow-up, evaluation of the morphology discrimination algorithm on 113 spontaneous episodes (31 VTs, 31 AF, 7 SVTs, and 44 sinus tachycardias) exhibited a specificity of 89%, a sensitivity of 100%, and a diagnostic accuracy of 92%. In conclusion, the morphology discrimination algorithm exhibits a high specificity in discriminating VTs from SVTs, although with a corresponding reduction in sensitivity. The preliminary experience on spontaneous episodes is promising. To correct for the reduction in sensitivity, it is advisable to use this algorithm in parallel with other algorithms for rhythm discrimination (sudden onset, stability) coupled with extended high rate. 相似文献
9.
10.