G31产细菌纤维素结构表征及其面膜性能测试

以葡糖醋杆菌G31为菌种，用HS培养基发酵制备细菌纤维素（BC），产物湿重产率为320．1g／L。利用蒽酮比色法、酶水解法初步证明发酵产物为纤维素，采用FTIR、SEM、XRD、CP／MAS 13CNMR、DSC和TG对其结构进行了表征并测试了其性能。结果表明：发酵产物具有超细三维网状结构，属于结晶度为92．42％的纤维素I型，具有良好的持水性和拉伸性。分子质量测定结果显示：Mw=5737，属于低相对分子质量BC，其氧气透过率和水蒸气透过率分别为913．55±3．23cm3／（m2.d.0.1MPa）和656．15±3．92g／（m2．d），表明该BC具有更好的锁水能力，为其在面膜领域的应用奠定了基础。

分期护理治疗痤疮75例

目的:观察分期护理治疗痤疮临床疗效。方法:将143例痤疮患者随机分为2组。治疗组75例,将痤疮分为粉刺期;丘疹脓疱期;囊肿结节期;色素瘢痕期。根据不同分期采用不同的美容针清手法和面膜,1次/3d;对照组68例,使用四环素0.25g,复方甘草锌胶囊0.5g,均3次/日,痤疮王外涂1次/日。4周一个疗程,2个疗程观察疗效。结果:痊愈率治疗组为69.3%,对照组为45.6%;总有效率治疗组为96%,对照组为73.6%。2组痊愈率、总有效率比较,差异均有显著性意义(P<0.05)。结论:分期护理治疗痤疮疗效优于优于西药组。

Use of New Water Soluble Surface Film－Forming Material to Reduce Ammonia Loss from Water Solution

A new water soluble surfaCe film-forming material was developed and its effect on reducing ammonia volatilization from an alkaline solution was investigated in laborstory. Results showed that the new film formed by the material was not only more effective in reducing ammonia loss than any other films tested but also much cheaper. The optimum amount of addition of the new film-forming material was about 10times the theoretical amount to form a monomolecular film. Under the experimental conditions, the new film could effectively depress the ammonia volatilization for at least 6 days. The cumulative ammonia loss rates for different films were fitted to a simple logistic equation, and some important parameters such as the cumulative loss, and the maximum and average volatilization rates were calculated. The effect of different films could be, therefore, compared quantitatively, indicating the new film was most effective in depressing ammonia volatilization.

Application of response surface methodology to the chemical cleaning process of ultrafiltration membrane

A numerical model was established to predict and optimise the chemical cleaning process of Polyvinylidene Fluo- ride （PVDF） Ultrafiltration （UF） membranes with the results from the experiment that applied the Response Sur- face Method （RSM） and Central Composite Design （CCD）. The factors considered in the experimental design were sodium hydroxide （NaOH） concentration, sodium bypochlorite concentration （NaCIO）, citric acid concentration and cleaning duration, The interactions between the factors were investigated with the numerical model. Humic acid （20 mg· L-1） was used as the model foulant, and chemical enhanced backflush （CEB） was employed to sim- ulate the chemical cleaning process. The concentrations of sodium hydroxide, sodium hypochlorite, citric acid and cleaning duration tested during the experiments were in the range of 0.1%-0.3% 100-300 mg· L-1 1%-3% and 0.5-1.5 h, respectively. Among the variables, the sodium hypochlorite concentration and the cleaning dura- tion showed a positive relationship involving the increased efficiency of the chemical cleaning. The chemical cleaning efficiency was hardly improved with increasing concentrations of sodium hydroxide. However, the data was sharply decreased when at a low level of sodium hydroxide concentration. In total, 54 sets of cleaning schemes with 80% to 100K cleaning efficiency were observed with the R＆M model after calibration.

Application of U-fixed red wax mask in radiotherapy

Objective： The aim of our study was to compared non-red wax compensator and adding red wax compensator in the treatment plans of the minimum dose, maximum dose, mean dose and target surface dose, and compare the dose volume histograms （DVH） parameters and isodose distributions of two plans. Methods： From January 2009 to December 2010, 8 patients with superficial head and neck cancer and without surgery treatment were collected. They all confirmed by cancer center, Tianmen First People＇s Hospital. Topslane WiMRT was used to design the treatment plan of non-red wax compensator and adding red wax compensator, with 6 MV photons using three-dimensional conformal irradiation mode design, the prescription dose was 50 Gy/25 times. Results： Compared non-red wax compensator with adding red wax compensator, its target minimum dose （t = -3.157, P 〈 0.05） and the target surface dose sJgnJficantJy improved （t = -0.020, P 〈 0.05）, whJle the target maximum dose （t = -0.140, P 〉 0.05） and mean dose （t = -9.914, P 〉 0.05） were considered no significant difference. Conclusion： The use of U-shaped mask fixed red wax film production in conformal radiotherapy tissue compensator can significantly improve the surface dose and dose distribution superficial planning target volume.

Controlling reduction degree of graphene oxide membranes for improved water permeance

Tailoring tire pore structure and surface chemistry of graphene-based laminates is essentially important for their applications as separation membranes. Usually, pure graphene oxide （GO） and completely reduced GO （rGO） membranes suffer florn low water permeance because of the lack of pristine graphitic sp2 domains and very small interlayer spacing, respectively. In this work, we studied the influence of reduction degree on the structure and separation pertornrance of rGO membranes, tt was found that weak reduction retains the good dispersion and hydrophilicity of GO nanosheets. More importantly, it increases the number of pristine graphitic sp2 domains in rGO nanosheets while keeping the large interlayer spacing of the GO membranes in most regions at the same time. The resultant mernbranes show a high water permeance of 56.3 L m^-2 h^ -1 bar^ -1, which is about 4 times and over 10^4 times larger tban those of the GO and completely reduced rGO membranes, respectively, and high rejection over 95700 for various dyes. Furthermore, they show better structure stability and more superior separation perfor- mance than GO membranes in acid and alkali environments.

Homogenization of a Class of Nonlinear Variational Inequalities with Applications in Fluid Film Flow

The authors consider the homogenization of a class of nonlinear variational inequalities,which include rapid oscillations with respect to a parameter.The homogenization of the corresponding class of differential equations is also studied.The results are applied to some models for the pressure in a thin fluid film fluid between two surfaces which are in relative motion.This is an important problem in the lubrication theory.In particular,the analysis includes the effects of surface roughness on both faces and the phenomenon of cavitation.Moreover,the fluid can be modeled as Newtonian or non-Newtonian by using a Rabinowitsch fluid model.