An investigation and analysis on the effect of current bilingual teaching has been done among the 2002rd seven-year program students by using questionnaire.The result can provide basic foundation for improving the quality of bilingual teaching.

Atherosclerosis ; Endothelial Cells ; Humans ; Nitric Oxide Synthase Type III ; Stem Cells

To study the antiarrhythmic effect of the newly developed alpha/beta-blocker TJ0711, a variety of animal models of arrhythmia were induced by CaCl2, ouabain and ischemia/reperfusion. Glass microelectrode technique was used to observe action potentials of right ventricular papillary muscle of guinea pig. The onset time of arrhythmia induced by CaCl2 was significantly prolonged by TJ0711 at 0.75, 1.5 and 3 mg x kg(-1) doses. TJ0711 (1.5 and 3 mg x kg(-1)) can significantly shorten the ventricular tachycardia (VT) and ventricular fibrillation (VF) duration, the incidence of VF and mortality were significantly reduced. On ischemia-reperfusion-induced arrhythmic model, TJ0711 (0.25, 0.5, 1 and 2 mg x kg(-1)) can significantly reduce the ventricular premature contraction (PVC), VT, VF incidence, mortality, arrhythmia score with a dose-dependent manner. At the same time, rats serum lactate dehydrogenase (LDH) and creatine kinase (CK) activities decreased significantly by TJ0711 (1 and 2 mg x kg(-1)). Ouabain could cause arrhythmia in guinea pigs, when TJ0711 (0.375, 0.75, 1.5 and 3 mg x kg(-1)) was given, the doses of ouabain inducing a variety of arrhythmia PVC, VT, VF, cardiac arrest (CA) were significantly increased with a dose-dependent manner. In the TJ0711 0.1-30 micromol x L(-1) concentration range, guinea pig right ventricular papillary muscle action potential RP (rest potential), APA (action potential amplitude) and V(max) (maximum velocity of depolarization) were not significantly affected. APD20, APD50 and APD90 had a shortening trend but no statistical difference with the increase of TJ0711 concentration. TJ0711 has antiarrhythmic effect on the sympathetic nerve excitement and myocardial cell high calcium animal arrhythmia model. Myocardial action potential zero phase conduction velocity and resting membrane potential were not inhibited by TJ0711. APD20, APD50 and APD90 were shortened by TJ0711 at high concentration. Its antiarrhythmic action mechanism may be besides the action of blocking beta1 receptor, may also have a strong selective blocking action on alpha1 receptor and reducing intracellular calcium concentration.
Action Potentials ; drug effects ; Adrenergic alpha-Antagonists ; administration & dosage ; pharmacology ; Adrenergic beta-Antagonists ; administration & dosage ; pharmacology ; Animals ; Anti-Arrhythmia Agents ; administration & dosage ; pharmacology ; Arrhythmias, Cardiac ; blood ; chemically induced ; etiology ; pathology ; physiopathology ; Calcium Chloride ; Creatine Kinase ; blood ; Dose-Response Relationship, Drug ; Female ; Guinea Pigs ; Heart Ventricles ; cytology ; Lactate Dehydrogenases ; blood ; Male ; Myocardial Reperfusion Injury ; complications ; Myocytes, Cardiac ; drug effects ; physiology ; Ouabain ; Papillary Muscles ; cytology ; Phenoxypropanolamines ; administration & dosage ; pharmacology ; Random Allocation ; Rats ; Rats, Sprague-Dawley

By means of HPLC,the changes of endogenous hormones in the process of releasing dormancy in Fritillaria thunbergii Miq. seeds were determined. The results indicated that the content of GA3 had a process of increase while the content of ABA was reduced in general. The content of IAA showed a downward -plateau-upward-downward curve in the process of releasing dormancy. When the dormancy of the seeds were released attemperatures 8~10℃ and 3~5℃,changing pattern of each of the three endogenous hormones were similar,but the duration spanning each change were different.

0.05). The levels of PT, APTT, TT were longer and INR was higher and FB, PTA were lower in two groups at the end of operation than at the preoperative day (P0.05). CCABG group was higher than OPCABG group in Allogeneic blood transfusion (P

Objective To establish a satisfactory method of isolating,culturing and determining gut neural crest stem cells,which may provide theoretical basis for clinical application.Methods The guts of embryonic mice removed and dissociated were plated into serum-free DMEM/F12 medium.The mitogen-free DMEM/F12 medium supplementd with 10% fetal bovine serum was used to induce differentiation of GNCSCs.Neurospheres and their derivations were determined with immunocytochemical and immunofluorescent staning.Results Neurospheres were generated in the simplified serum-free medium.The staining results showed that enteric neurospheres were GNCSCs and could differentiate into neurons,glial cells and smooth muscle cells by serum-induction.Conclusion GNCSCs have the capacity of self-renewal and proliferation,and give rise to neurons,glial cells and myofibroblasts.

Objective To introduce the clinical experience of Bentall procedure with composite tissue valve conduit. Methods Five patients were diagnosed as severe aortic regurgitation with dilatation of Valsava sinus and sinotubular junction and ascending aorta. Mean age of patients was (55.8?9.4) years (range 47～67). After median sternotomy , cardiopulmonary bypass was established using a single two-stage venous cannula. Temperature was brought to 28℃. After the ascending aorta was occluded, an aortotomy was made and aortic valve was excised. Aorta was removed from sinuses of Valsalva except for generous buttons around coronary ostia. After sizing the aortic annulus, an appropriate-size tissue valve and woven dacron conduit (3 mm greater in diameter than the tissue valve) were chosen to build a composite conduit. It was attached to annulus of aortic valve with pledget-reinforced horizontal mattress stitches to replace the aortic valve and ascending aorta as an en bloc procedure (Bentall procedure). In 2 cases, Coronary artery bypass grafting was performed with greater saphenous vein anastomosed distally to left anterior descending artery and proximately to conduit. Results All cases recovered uneventfully and they were discharged without any postoperative complications. Echocardiography was repeated before discharge. Mean aortic pressure gradient was (18.3?7.6) mmHg. Left ventricular dimension was significantly reduced [(58.8?6.3)mm vs. (43.7?3.1)mm]after operations(P0.05). Follow-up was 2 to 8 months. Conclusion With composite tissue valve conduit, Bentall procedure to replace the aortic valve and ascending aorta as an en bloc procedure is feasible and safe for the elderly patients. A long-term follow-up for the function and structure of tissue valve is needed.

Nucleolin is implicated in many pathological processes,particularly in inflammatory diseases,viral infection and neoplasms.Nucleolin levels are increased in several neoplasms and its localization changed,which play important roles in cell proliferation,apoptosis and metastasis of neoplasms.

HER2-positive breast cancer is highly aggressive and prone to recurrence and metastasis. T-DM1 (Ado-Trastuzumab Emtansine) is a new anti-HER2 targeted drug with targeting therapeutic effect and cytotoxic killing. It was officially approved by the National Medical Products Administration in February 2020, but there are few reports about its application in China. In this paper, a case of locally advanced HER2-positive breast cancer treated with T-DM1 was reported, and relevant literature was reviewed to improve the understanding of targeted drug T-DM1, in order to provide a new anti-HER2 treatment option for HER2-positive breast cancer patients.

Objective To observe the effect of retrograde sinus coronary perfusion on the function of myocardial cell membrane following retrograde sinus coronary perfusion Methods Thirty two isolated rabbit hearts were randomized into 4 groups: Group A, hearts were kept beating by retrograde perfusion with normothermic oxygenated blood; Group B, hearts received retrograde coronary sinus perfusion with warm blood cardioplegia; Group C, hearts received retrograde coronary sinus perfusion with cold blood cardioplegia; Group D, hearts received retrograde coronary sinus perfusion with cold crystalloid cardioplegia After 60 min retrograde perfusion, the hearts were switched on Langendorff Neely antegrade perfused working heart model for other 60 min Free calcium in myocardial cell, myocardial membrane MDA, ATPase and myocardial cell membrane fluidity were measured Results After retrograde coronary sinus perfusion, activity of ATPase and fluidity of the myocardial cell membrane in group A were higher than those in groups B, C and D The contents of myocardial cell membrane MDA and calcium in myocardial cell following retrograde perfusion were much lower in group A than those in groups B and C There was no remarkable difference between group C and group D Conclusion Retrograde perfusion of beating heart is superior to those perfused with warm blood cardioplegia in reducing free radical production, ameliorating paradoxical calcium accumulation in myocardial cell and maintaining activity of ATPase and fluidity of the myocardial cell membrane Warm blood cardioplegia is superior to cold blood cardioplegia