Advanced Materials Research Vols. 915-916

Abstract: In this paper, the hemp / cotton / polyester mesh knitted fabric (Han / C / T) is treated by alkali treatment, conventional dyeing and alkali pre-treatment dyeing. We have obtained the conclusion that alkali treatment improves the dyeing effect. Alkali pre-treatment dyeing was done after alkali treatment. The fabric dyeing effect is improved obviously. The optimum process come from orthogonal experiment (dyes 2.5% owf, Na₂SO₄ :30g/L, Na₂CO₃:10g/L, liquor ratio (1:50) and 90°C×50 min). Through this optimum process, dyeing effect for hemp / cotton / polyester mesh knitted fabric is close to the pure cotton fabric dyeing effect.

Abstract: A method was developed to prepare the Antheraea Pernyi silk fibroin (ASF) microspheres using lysozyme as a model drug to estimate the application of ASF in drug controlled release field. The structure of ASF microsphere carried drug was characterized by X-ray diffraction and FTIR. The morphology and the influence of the microspheres on the degradation of lysozyme were investigated using scanning electron microscope. The results show that encapsulation rate was increased and drug content was decreased with the addition of lysozyme increasing. In vitro release of lysozyme from the ASF particles we demonstrated that the release kinetics depends on the pH. The pH played important roles in controlling lysozyme release profiles. It also can be seen that the degradation speed of lysozyme ASF microspheres slightly larger than the pure ASF microspheres.

Abstract: The aim of this study was to determine the effect of dipping in 1% sodium bisulfite solution and packaging under nitrogen on qualitative properties of fresh sweet corn (Zea mays L.) sterilized at 121°C for 15 min and stored at 30°C for 90 days. Water content in all samples was maintained well during the storage. The samples either dipped in 1% sodium bisulfite solution or packaged under nitrogen all could better keep the content of soluble and reducing sugar than control and inhibit the browning caused by Maillard reaction during the sterilization.

Abstract: This paper deals with the difference of finite element analysis of results between distinguishing bone materials modeling and single bone material modeling. The computed tomography (CT) data was used to build the model that can distinguish cortical bone, cancellous bone of the femur model, together with the plates could be used to set up internal fixation system and do the finite element analysis. The results indicated that the distributions of stress and strain were basically the same, so were the location of the maximum stress and strain. While, except under the axial loads the value of maximum stress and the value of maximum strain showed significant differences. Finally, study reached the conclusion that under the axial loads there were no significant difference between the two methods, thus the single bone material model could be used for easier computing, while, under the other 4 consequences paper recommended distinguishing bone material method for more practical results.

Abstract: Applying Escherichia coli (E. coli) for fermentation is a very common technology. However combined with genetic engineering techniques to construct the recombinant Escherichia coli and study their growth characteristics has become the hot spot now. The recombinant Escherichia coli BL21 (DE3) /pET-28baroGM150 had been constructed by our laboratory in the previous experiment. And the purpose of this study was to optimize the proliferation conditions of Escherichia coli BL21 (DE3) /pET-28baroGM150. In order to make the recombinant Escherichia coli grow stable under suitable conditions, using the density of bacteria and plasmid stability as indexes, three factors were tested including temperature, initial pH and loading volume. And the results indicated that the optimal proliferation temperature of the recombinant strain was 30°C, initial pH value was 6.5, loading volume was 150 mL medium of 1000 mL bottles.

Abstract: The present paper describes the preparation and characterization of novel biodegradable nanoparticles based on self-assembly of poly-γ-glutamic acid (γ-PGA). The nanosystems were stable inaqueous media at low pH conditions. Solubility of the systems was determined by turbidity measurements. Surface charge and mobility were measured electrophoretically. It was found that the size and size distribution of the nanosystems depends on the concentrations of γ-PGA solutions and their ratio as well as on the pH of the mixture and the order of addition. The average hydrodynamic diameters were between 150 and 330 nm. These biodegradable,self-assembling stable nanocomplexes might be useful for several biomedical applications.

Abstract: In this paper, PAA-Ch/hydrogel compounds and it containing PRP (platelet-rich-plasma), bone cell composites were obtained by UV light or γ-ray irradiation method forscaffold material application. We utilized nanosized silica solution, natural chitosan and acrylicacid (AAc) as raw material to synthesize PAA-Ch/hydrogel products. The identified func-tional group peaks from FTIR has shown the evidence for the successful grafting of PAA-Ch-Si hydrogel nanocomposites through radiation co-polymerization procedure. The mechanical property analysis indicate that PAA-Ch/hydrogels have strong compressive strength and fitted friction coefficients when PAA incorporated with both chitosan and nano-silica. We also obtained that the animal models of PAA-Ch/ hydrogel composites and it incorporating PRP,bone cell as the bone supplying materials. The animal tests results proved that these composites are more compatible and efficacious for bone defect healing.

Abstract: The management and treatment of medical waste directly affected the security of doctors, patients and human health. The hazard of medical wastes and domestic status of medical waste management were discussed, the countermeasures for achieving sustainable management of medical waste in China were put forward on the basis of the theoretical framework of life cycle assessment and whole-process management called Cradle-toGrave. Finally, the development direction and trend, appropriate suggestion and control measures of medical waste management was put forward combined with the international development requirements.

Abstract: This paper studied wettability of three typical petals such as nasturtium, canna and rose. Contact angle of several typical petals were measured by the contact angle measuring instrumen, which were 154.6°,151.5°and 153.4°respectively. Microstructure of the nasturtium petals, canna petals and rose petals were observed through scanning electron microscopy, It found that 3 typical petals are composite structure of micronscale and nanoscale, although their forms is different, they all have superhydrophobic function. This paper analyzed the reasons for the superhydrophobicity for different microstructures of three typical petals.

Abstract: A high molecular weight hyaluronic acid-producing mutant, designated as Streptococcus equi SH-109 that did not produce streptolysin or hyaluronidase was selected from wild-type Streptococcus equi SH-0 by NTG treatment. The selected mutant could produce high molecular weight HA and had perfect genetic stability after reproduction. Several culture conditions were optimized in a 5-l fermentor for the production of hyaluronic acid. It was found that the optimal pH and agitation speed were 7.6 and 550rpm, respectively. Under the optimized culture condition, hyaluronic acid with a molecular weight of 4.0 x 10⁶ was accumulated in the culture broth.