Bacterial N-Acyl-L-homoserine lactones (AHLs)-mediated quorum sensing is involved in the regulation of diverse biological functions. As the bacterial pathogen population density increases, AHLs concentration secreted by pathogen reaches a threshold and then interacts with their intercellular receptor and triggers expression of virulence genes. It is a promising approach to biologically control bacterial disease in plants and animals by manipulating bacterial AHL-quorum sensing with AHLs-degrading enzyme and AHL analogue.

Ralstonia metallidurans CH34 was isolated from the deposit of a znic factory .The degradation of phenol by R .metallidurans CH34 was investigated. The results showed that R . metallidurans CH34 possesses high ability to degrade phenol with the biodegradation rate constant of 0.33 . The optimal pH , temperature and volume of medium for phenol degradation are pH 7.0 , 30℃ , and 20%(v/v), respectively . In addition , this strain retains its ability to degrade phenol in the presence of high concentration of heavy metal ion .The sodium citrate , sodium succinate can enhance the degradation of phenol.

In order to evaluate the characteristics of the spray drying of total flavonoids of Epimedium extracts assisted with soybean polysaccharide, a certain percentage of soybean polysaccharide or polyvidone were added to the total flavonoids of Epimedium extract to conduct the spray drying. The effect of soybean polysaccharides against the wall sticking effect of the spray drying was detected, as well as the powder property of total flavonoids of Epimedium spray drying powder and the dissolution in vitro behavior of the effective component. Compared with the total flavonoids of Epimedium spray drying powder, soybean polysaccharide revealed a significant anti-wall sticking effect. The spray drying power which had no notable change in the grain size made a increase in the fluidity, improvement in the moisture absorption and remarkable rise in the dissolution in vitro behavior. It was worth further studying the application of soybean polysaccharide in spray drying power of traditional Chinese medicine.
Epimedium ; chemistry ; Flavonoids ; analysis ; Particle Size ; Polysaccharides ; chemistry ; Powders ; Soybeans ; chemistry

Membrane proteins are the main undertakers of biofilm function, and also the most important target group for innovative drug discovery and research. About 60% of drugs targets are membrane proteins. Due to the obvious aggregation and denaturation tendency of membrane proteins in aqueous solution, it is difficult to simulate the membrane like environment to maintain the correct conformation of membrane proteins in vitro, which results in the slower-growing research on the structure and function of membrane proteins and related ligand drugs than that of water-soluble proteins. Membrane protein stabilization technology is the premise of establishing high specificity, high sensitivity and high throughput drug screening methods for membrane protein ligands, which is of great significance. In this paper, some techniques for stable separation and purification of membrane proteins are reviewed, including detergents, artificial membranes, polymers, lentiviral particles and so on, as well as their specific applications in drug screening.

OBJECTIVETo investigate the factors affecting the survival and to predict the survival time of glioma.

METHODSGraph method was applied to fit the type of probability distribution of patients' postoperative survival time. As one suitable model, Weibull regression model tested by residual analysis was used to identify prognostic factors for postoperative survival and to predict patients' post-operative survival time.

RESULTSIn multivariate analysis of Weibull regression model, following characteristics showed significant influence on postoperative survival time including: sex, age, epilepsy, type of glioma, density of glioma, type of surgery, times of surgery and mode of postoperative therapy. According to predictive value, patients were clustered into three groups. The survival probability of one year for the first group was less than 50% and that of five years for the second group about 50%, for the third group around 80%.

CONCLUSIONSex, age, epilepsy, type of glioma, density of glioma, type of surgery, times of surgery and mode of postoperative therapy were important risk factors and Weibull regression model might help to predict patients' postoperative survival time.

Brain Neoplasms ; epidemiology ; mortality ; surgery ; China ; epidemiology ; Factor Analysis, Statistical ; Female ; Glioma ; epidemiology ; mortality ; surgery ; Humans ; Male ; Multivariate Analysis ; Postoperative Period ; Prognosis ; Proportional Hazards Models ; Regression Analysis ; Risk Factors ; Survival Analysis

Clove oil and turmeric oil were absorbed by mesoporous carbon. The absorption ratio of mesoporous carbon to volatile oil was optimized with the eugenol yield and curcumol yield as criteria Curing powder was characterized by scanning electron microscopy (SEM) and differential scanning calorietry (DSC). The effects of mesoporous carbon on dissolution in vitro and thermal stability of active components were studied. They reached high adsorption rate when the absorption ratio of mesoporous carbon to volatile oil was 1:1. When volatile oil was absorbed, dissolution rate of active components had a little improvement and their thermal stability improved after volatile oil was absorbed by the loss rate decreasing more than 50%. Absorbing herbal volatile oil with mesoporous carbon deserves further studying.
Adsorption ; Carbon ; chemistry ; Drug Stability ; Microscopy, Electron, Scanning ; methods ; Oils, Volatile ; chemistry ; Sesquiterpenes ; chemistry

Oleanolic acid-precipitated calcium carbonate solid dispersion was prepared by using solvent evaporation method. The microscopic structure and physicochemical properties of solid dispersion were analyzed using differential scanning calorimetry and scanning electron microscopy (SEM). And its in vitro release also was investigated. The properties of the precipitated calcium carbonate was studied which was as a carrier of oleanolic acid solid dispersion. Differential scanning calorimetry analysis suggested that oleanolic acid may be present in solid dispersion as amorphous substance. The in vitro release determination results of oleanolic acid-precipitated calcium carbonate (1: 5) solid dispersion showed accumulated dissolution rate of.oleanolic acid was up to 90% at 45 min. Accelerating experiment showed that content and in vitro dissolution of oleanolic acid solid dispersion did not change after storing over 6 months. The results indicated that in vitro dissolution of oleanolic acid was improved greatly by the solid dispersion with precipitated calcium carbonate as a carrier. The solid dispersion is a stabilizing system which has actual applied value.
Calcium Carbonate ; chemistry ; Calorimetry, Differential Scanning ; Chemistry, Pharmaceutical ; Drug Carriers ; chemistry ; Drug Stability ; Microscopy, Electron, Scanning ; Oleanolic Acid ; chemistry ; Plant Extracts ; chemistry ; Solubility

In order to evaluate the characteristic of porous starch (PS) as the solid dispersions carrier of the total Epimedium flavonoids (TEF), the PS was used. The dissolution of icariin was selected as an indicator to analyze the differences of dissolution between TEF and its solid dispersion. TEF was characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray powder diffraction (XRD). Solid dispersion was irregular block and no powder characteristics of TEF and PS could be seen in SEM, DSC and XRD analysis suggested that TEF may be present in solid dispersion as amorphous substance. The dissolution rate of icariin has been improved significantly when the proportion of TEF and PS was 1:2. PS as a traditional solid dispersion carrier is worthy of further study.
Calorimetry, Differential Scanning ; Chemistry, Pharmaceutical ; Drugs, Chinese Herbal ; chemistry ; Epimedium ; chemistry ; Flavonoids ; chemistry ; Porosity ; Solubility ; Starch ; chemistry ; X-Ray Diffraction

Adult ; Female ; Forearm ; surgery ; Free Tissue Flaps ; Humans ; Male ; Middle Aged ; Oral Surgical Procedures ; methods ; Reconstructive Surgical Procedures ; methods ; Skin Transplantation

To evaluate the properties of solidifying volatile oil with graphene oxide, clove oil and zedoary turmeric oil were solidified by graphene oxide. The amount of graphene oxide was optimized with the eugenol yield and curcumol yield as criteria. Curing powder was characterized by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The effects of graphene oxide on dissolution in vitro and thermal stability of active components were studied. The optimum solidification ratio of graphene oxide to volatile oil was 1:1. Dissolution rate of active components had rare influence while their thermal stability improved after volatile oil was solidified. Solidifying herbal volatile oil with graphene oxide deserves further study.
Calorimetry, Differential Scanning ; Clove Oil ; chemistry ; Curcuma ; chemistry ; Eugenol ; Graphite ; chemistry ; Microscopy, Electron, Scanning ; Oils, Volatile ; chemistry ; Oxides ; chemistry ; Plant Extracts ; chemistry ; Powders ; Sesquiterpenes