Objective: To study the difference between the acid resistance of Streptococcus mulans Ingbritt C international standard strain and the acid resistance of LuxS mutant strain. Methods: Solutions of Streptococcus mulans standard strain and LuxS mutant strain with same density were prepared and cultured at pH 3. 5 to 7. 0 BH1 liquid for same period. Terminal growth situation was compared. After being acidized in pH 5.5 BHI liquid, the two strains were cultured at pH 3.0 BHI liquid. The acid tolerance responses of the two strains were compared. Results; (DAt pH 6.0 to 7. 0, the difference of growth between Streptococcus mulans standard strain and LuxS mutant strain was not significant at the same pH value, and the differences of bacterial growth situation under three different pH values were not significant. (1)At pH 4.5 to 5.5, the difference of growth between the two strains was significant. (2)At pH 3.0,the survival rate of LuxS mutant strain(0.006 5% )was significantly lower than the standard strain (0.078% ). (3)At pH 5.5, the survival rate of LuxS mutant strain(0.747% ) was lower than the standard strain(8.65% )by about 10 times after the pre-acidification. Conclusion; (4)At sub-lethal pH value, there is significant difference of aciduricity between Streptococcus mu-tans standard strain and LuxS mutant strain. The acid resistance of standard strain is stronger than that of LuxS mutant strain. The two strains both display the capability of acid tolerance responses. LuxS mutant strain is more sensitive to acid inactivation, but the capability of acid tolerance responses still exists.

Objective To knock out the entire LuxS gene of Streptococcus mutans UA159 strain via homologous recombination and construct a LuxS-deleted mutant strain of S.mutans.Methods The erythromycin resistance gene(Eymr)was inserted between the two DNA fragments located in the upper and downstream of LuxS gene that had been amplified by PCR.Then the two DNA fragments along with the inserted Eymr were engineered into pUCl9 plasmid to construct the recombination plasmid pUCluxKO.Electrotransformation of S. mutans cells with pUCluxKO-mutant resulted in the isolation of erythromycin resistant S.mutans,transformants,which was then subjected to polymerase chain reaction,Vibrio harveyi BBl70 luminescence bioassay and sequencing analysis.Results Restriction endonuclease analysis showed that pUCluxKOmutant vector had been successfully recombined.The deletion of LuxS of S. mutans mutants was confirmed bv PCR with primers specific for the genes of LuxS and the erythromycin resistance.S.mutans mutant could not induce bioluminescence.indicating the mutant had been successfully recombined.The constructed Chinese S.mutans showed good stability after 20 generations of cultivation.Conclusion The S.mutans gene allelic exchange plasmid is constructed correctively and a LuxS-negative mutant of S.mutans has been constructed.which can be helpful for further study of the role of LuxS in the pathogenesis of S.mutans.

Objective To characterize the image morphology and time-intensity curve of renal cell cancer and angiomyolipoma on contrast-enhanced harmonic sonography. Methods A total of 57 patients with 58 renal masses were enrolled in this study prospectively. The renal masses included 47 renal cell carcinomas (RCC) and 11 angiomyolipomas (AML). All patients were evaluated by tradi-tional gray-scale sonography, color Doppler sonography and contrast-enhanced harmonic sonography. Imaging findings and time-intensity curves of all renal masses were analyzed. The contrast-enhance-ment features between RCC and AML were analyzed. Results 57.4% of RCCs were hyperechoic masses and peripheral surrounding vessels and / or penetrating vessels were noted in 83.0% of RCCs on color Doppler sonography. 54.5 % of AMLs were hyperechoic masses while peripheral surrounding vessels and / or penetrating vessels were only noted in 27.3% of AMLs on color Doppler sonography. On contrast-enhanced harmonic sonography, hyper- or iso-enhancement were noted in 83.0% of RCCs, while hypo-enhancement were noted in 81.8% of AMLs (P<0.01). Statistically significant differences were noted between RCC and AML in the values of peak time (P=0.03), wash time (p= 0.02), peak intensity-basic intensity (P=0. 01), AT/R (△A tumor/△A renal) (P=0.00), k (P= 0.02), and Aok (P=0.02). Conclusions Contrast-enhanced sonography is useful in the differentia-tion of renal masses. Most RCCs are hyper- or iso-enhanced while most AMLs are hypo-enhanced. Time-intensity curves are helpful in differentiating RCC and AML.

Objective To know the influence of out-hospital nursing with no gap on the level of HbAlc for patients with diabetes.Methods Divided 80 patients with diabetes into the intervention group and control group randomly,there were 40 cases in the each group.Out-hospital nursing cares with no gap were used in the intervention group,while the routine nursing cares were used in the control group.Fellowed up 1 year.Compared the FPG,2 hPG and HbAlc between the two groups at the time points of the 3rd,6th,9th and 12th month when out of hospital.Results All the indexes which had monitored were better in the intervention group than those of in control group.Conclusions Out-hospital nursing with no gap can remain the indexes in the normal level,and then promote their quality of life,which should be developed in clinical field.

Objective To Study on anti-thrombosis effect of volatile oil of Acorus Tatarinowii Schott(AST) and ?-asarone.Methods Thrombosis test,blood hyperviscocity test,blood clottingtest,and in vitro fibrinolytic test were carried out to investigate the effects of volatile oil of AST and ?-asarone on the following indexes:weight of thrombus,prothrombin time(PT),activated part prothrombin time(APTT),hemorheology,clotting time,the weight of plasma fibrin clot.Results Volatile oil of AST and ?-asarone can lower the weight of venout thrombosis in rats,and prolong PT and APTT of blood plasma in rats.They can improve hemorheology in the hyperviscocity rats,especially reduce viscosity of whole blood and blood plasma obviously.They can prolong the clotting time in mice obviously;and decrease the weight of plasma fibrin clot.Conclusion Volatile oil of SCP and ?-asarone has anti-thrombosis anticoagulationand fibrinolyitc effect,and its mechanism may be related to the prolongation of PT and APTT,improving blood viscosity.

Aim To study effects of grape seed proanthocyanidin (GSP) on learning and memory in mice. Methods After po GSP 10,20,40 mg?kg -1 respectively and contemporaneously sc D-galactose 1.25 g?kg -1 for 6 weeks, step down test and Y-type electric maze were used to examine the efficacy of GSE on learning and memory of mice first. Then lipoperoxide(LPO) level in blood and brain of these mice was measured. After po GSP 10,20,40 mg?kg -1 respectively for 2 weeks, the ability of learning and memory was measured by Morris Water Maze task. Results GSP significantly prolonged step-down latency in the mice and decreased number of errors in 5 minutes in step down test; and significantly decreased number of errors of these mice in Y-type electric maze test. LPO level in blood and brain of these mice was lower than that of model group. GSP also increased crossing platform times(CPT) and crossing platform percentages(CPP) in normal mice rested for 30 days in morris water maze test. Conclusion GSP can elevate the ability of learning and memory in mice treated with D-galactose, also improve memory retrieval at the spatial probe trials in normal mice. Mechanisms of these actions may probably be attributable antioxidative activity of GSP.

OBJECTIVE: To explore the clinical characteristic, the CT, MRI features, diagnosis and treatment of low grade myofibroblastic sarcoma in head and neck. METHOD: Six cases of low grade myofibroblastic sarcoma in head and neck were diagnosis and reviewed retrospectively. Routine preoperative CT and MRI examination were performed. RESULT: All cases were operated one case with radiotherapy before operation was given with a total dose of 60 Gy. The patients were follow-up for 6 months to 5 year and no recurrence was found. No complications occurred in 6 cases. CONCLUSION It has been confirmed in this research that LGMS is a low-grade malignangt tumor. It was difficult to make early diagnosis through frozen section. The final diagnosis depend on paraffin section and immunohistochemisty. Extended local excision with tumor-free margin is the treatment of choice.
Adult ; Aged ; Female ; Follow-Up Studies ; Head and Neck Neoplasms ; diagnosis ; surgery ; Humans ; Male ; Middle Aged ; Myosarcoma ; diagnosis ; surgery ; Retrospective Studies ; Young Adult

Objective To evaluate the effectiveness of professional nurses in atrial fibrillation (AF) anticoagulation management system.Methods 217 consecutive patients with nonvalvular AF were enrolled.All patients received warfarin therapy for 3-6 months after catheter ablation for AF,who were divided into experimental group (n=102) and control group (n=115) by random digits table.The patients of control group adjusted their warfarin doses by following doctor's advice when discharged and by visiting the outpatient clinic regularly after discharged.The patients of treatment group adjusted their warfarin doses under the guidance of one well-trained nurse.Days of the international normalized ratio (INR) value achieved therapeutic anticoagulation range (2.0-3.0) for the first time,the effective anticoagulation rate that defined as more than 70％ of INR values between 2.0-3.0 after titration period,the ratio of times of INR value 2.0-3.0 to total times after titrating and INR monitoring frequency were compared between the 2 groups.Results In treatment group,days of the INR value achieved therapeutic 2.0-3.0 for the first time were less than that in control group (8 d vs.15 d,P＜0.01),the effective anticoagulation rate [45.1％(46/102)] and the ratio of times of INR value 2.0-3.0 to total times after titrating (67.6％±18.5％) was significantly higher than that in control group [31.3％(36/115) and 62.0％±23.1％ respectively,P＜0.05].INR monitoring during the whole period and after titrating were more frequently in treatment group [(9.4±2.2)times vs.(8.4±2.7) times,P＜0.05;(7.9±2.4) times vs.(6.3±2.8) times,P＜0.01].The number of patients in treatment group who monitor INR less than 3 times after titrating was larger than that in control group (18 vs.1,P＜0.01).Conclusions The participation of professional nurses in atrial fibrillation anticoagulation management system was helpful not only in achieving INR 2.0-3.0 more quickly but also in improving the effective anticoagulation rate.

OBJECTIVE To explore the safe and effective dose of sirolimus (Rapamycin,Sir) and its effect on seizure comorbidities. METHODS Immature C57BL/6 mice at postnatal 10 d of age were administered with kainic acid(KA) 12.0 mg · kg-1 intraperitoneally by a single injection to induce acute seizure. Sir 0.3, 1.0 and 3.0 mg · kg-1 was injected 24 h after seizure every other day until 3 d, 1 week, 3 weeks, 5 weeks and 6 weeks. Western blotting analysis was used to detect the expression and phos?phorylation level of S6 protein and to determine the minimum effective dose of Sir. Effect of the mini?mum effective dose of Sir on cognitive function and body growth was observed by several evaluations. Immunofluorescent intensity of Doublecortin (DCX) immunofluorescent staining was conducted to evaluate the development of neurons in the hippocampus. Morris water maze was used to assess the cognitive function. Tail suspension test, O maze and new object recognition test were used to study the anxiety-like behaviors of mice. RESULTS The result of Western blotting showed that Sir 0.3 mg · kg-1 had no significant effect on the phosphorylation of S6 protein in normal mice or KA mice, whereas 1.0 and 3.0 mg · kg- 1 could significantly inhibit the phosphorylation of S6 protein in KA mice (P<0.05). Sir 1.0 mg·kg-1 had no obvious effect on DCX-positive cells or body wass. Morris water maze showed that KA-induced seizure resulted in prolonged escape latency and swimming length (P<0.05), and a decreased crossing number of target quadrant (P<0.05). Sir 1.0 mg·kg-1 significantly reversed the deficit of cognitive function of KA-induced seizure mice (P<0.05), whereas no significant difference was found between Sir group and normal control group. Compared with normal control group, model group showed increased freezing time in tail suspension test (P<0.05), decreased migration length and reten?tion time in open arms in O maze (P<0.05), decreased retention time and touch frequency with new objects, migration length and average speed in new object recognition test (P<0.05). Sir 1.0 mg · kg-1 significantly reversed the above anxiety and depression status, whereas no significant difference was found between sirolimus group and normal control group. CONCLUSION Sir 1.0 mg · kg-1 inhibits the abnormal activation of mTOR pathway and the formation of epilepsy comorbidity in immature mice. Along with its mild side effect in development, Sir 1.0 mg · kg-1 will be an ideal dose to be used in the treatment of seizure in immature mice.

Objective To design and develop a cardiovascular automatic feedback control instrument for rescuing the critical patients.Methods Ten dogs used this kind instrument and the effects were obserred.Resuts The experiment of the dogs showed:the computer collected samples promptly,accurately and rapidly,and the instrument could help us to reach the expected goal.Conclusion In animal experiments,it showed that the whole cycle,from obtaining blood pressure to adjusting the amounts of medicine through feedback,was shortened.The calculating was accuratel and curative effect was reliable.This instrument is wait to be apprnsed by clinic.