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 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 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 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 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 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 investigate the condition and the related influence factors of small airway function in controlled bronchial asthmatic children.Methods Children diagnosed with bronchial asthma controlled,aged 5-14 years old without gender limitation were consecutively enrolled.Survey questionnaire including asthma symptoms in the past one month and medication usage were conducted.Physical condition and lung function were examined.Results A total of 255 patients were included in this study,and 224 patients had normal small airway function in which the level of forced expiratory flow at 50％ of forced vital capacity(FVC) exhaled (FEF50),forced expiratory flow at 75％ of FVC exhaled(FEF75),maximal mid-expiratory flow(MMEF) was 87.9％ (77.0％,97.2％),73.8％ (65.6％,93.5％),and 84.9％ (76.4％,97.5％) of the predicted value,respectively.Thirty-one patients had small airway dysfunction,accounting for 12.2％ (31/255 cases),and the level of FEF50,FEF75,MMEF were 62.8％ (59.9％,65.5％),51.9％ (46.6％,55.5％),and 62.7％ (57.2％,64.4％) of the predicted value,in which FEF75 had shown more decrease than others.In small airway dysfunction group,10 patients had conducted bronchodilation testing,and improvement rate of FEF50,FEF75 and MMEF were 41.1％,47.5％ and 41.3％,and all 10 cases (100.0％) returned to normal level.No significant difference was found in gender,body mass index,atopy,disease duration,drug usage between 2 groups (all P ＞ 0.05).Conclusion In 5-14 controlled asthmatic children,12.2％ have small airway dysfunction with a certain degree of reversibility.Gender,body mass index,atopy,disease duration,drug usage are not influencing factors.

The arterial source of the flap,the anastomoses of cutaneous arteries in theskin and subcutaneous tissue and nervous distribution in the flap were observed andsurveyed in 42 upper limbs of adult cadavers.1.The arterial source of the flap comes mainly from the cutaneous branches ofprofund brachial artery,radial collateral artery,lateral humeral cutaneous artery andcutaneous branches of the posterior circumflex humeral artery.In most cases theprofund brachial artery and radial collateral artery may be served as the vascularpedicle of the flap of lateral brachium in transplantation.2.The cutaneous arteries in this flap anastomose each other to from a networkin the skin and subcutaneous tissue.Cutaneous arteries arising from the medial brac-hial region and the upper part of forearm also participate in the formation of thisvascular network.3.The veins of the flap contain both superficial and deep groups:The superfi-cial group is the cephalic vein of brachium which goes upward along the lateralsulcus of m.biceps brachii and its outer caliber is somewhat wider;the deep groupfollows the profund brachial artery or radial collateral artery as their venae comit-antes.Both groups may be sutured together or separately with veins of the recipientin skin grafting.4.The lateral brachial cutaneous nerve and posterior antebrachial cutaneousnerve pierce through the lateral intermuscular septum at various levels,and innervateover the skin in lateral brachial and posterior forearm regions.Since the posteriorbrachial cutaneous nerve is accompanied closely by the radial collateral artery,muchattention should be paid to it in cutting skin flap.5.The extent of cutting a skin flap in lateral brachial region can be enlargeddue to free anastomoses with arteries of adjacent regions which was demonstrated byperfusing red ink into profund brachial artery.The flap of lateral brachium maybe subdivided into following three parts:the upper,middle and lower,the vascularpedicle of which are the cutaneous branch of posterior circumflex humeral artery,lateral humeral cutaneous artery and profund brachial artery(or radial collateralartery)respectively.

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.