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A bacterium(strain yc02) was isolated from environment, which could degrade polyvinyl alcohol. It was preliminary identified as the genus of Pseudomonas sp. The further degrading characterization research showed that the optimal degradation temperature, culture time, rotary speed and the initial pH of fermentation medium were 25°C, 60 h, 180 rpm and 7.5 respectively, the ratio of degradation reached...
To study the effect of Asparagus officinalis polysaccharide on the number and activity of erythrocyte complement receptor 1(CD35) in S180 mice. Red blood cells from mice venous blood are labeled by rat anti-mouse CD35 monoclonal antibody and FITC-conjugated goat anti-mouse antibody. Using flow cytometry, we determined the number of CR1. Using microscope, we studied the adherence between erythrocyte...
The electric charge transport is an important phenomenon in the systems like interacting quantum dots and molecules, and in polymers, including DNA molecules. We expect that in these nanostructure systems the key role is played by the interaction of the charge carriers with the optical phonons. We show the role of the multiple scattering of the charge carriers on the optical phonons in the inter-molecular...
Degradation of polyacrylamide(PAM) in aqueous solution was studied by using Fe2O3/Al2O3 or Fe2O3/carbon as heterogeneous catalyst in the presence of H2O2. In order to improve the catalytic activity, Effects of catalyst preparation conditions as impregnated materials, acid dipping and adding trace elements to catalyst activity were studied in the experiment. It was observed that Compared with Fe2(SO4)3,...
In this paper, based on the structure of lithium-ion batteries, the electrode materials were separated from spent lithium-ion batteries (LIBs) with aim to recycle all valuable components as possible. The spent LIBs were dismantled first, then the mechanical pulverization and sieving process was adopted in the separation of anodes, and dissolution method was used to partition active components from...
The sand-suspending thickener (SST), which is distilled from the natural plant alga, is a kind of polysaccharide biopolymer, so the SST is poisonless, harmless and no pollution. In order to verify the characteristics of the SST, we applied the self-designed Temperature Program Experiment System to test the inhibition characteristic, and applied the small-sized and medium-sized experiment to test the...
Injection stretching-blow molding (ISBM) has been used widely to produce thousands of hollow plastics products, such as drink bottles, automobile tanks, containers, and so on. In this study, both experimental and CAE analysis were carried out to model ISBM of the 26g-600 ml and 28g-600 ml bottles. The experiment results show that 28g-600 ml bottles have more uniform bottle thickness.
Chitosan, a glycosaminoglycan, is the second most abundant naturally occurring polysaccharides. It has been extensively exploited in biomaterials research due to its easy tailorable structure and function. Chitosan fibers are being produced through wet-spinning route for different purposes. But, chitosan fibers produced in conventional alkaline bath generally suffers from quick dissolution in acidic...
This paper addresses the influence of the viscoelastic material properties of adhesives on the functionality of SHM (Structural Health Monitoring) sensor applications. Adhesives behave viscoelastically and show a strong temperature and time dependency of their mechanical properties. Creep processes increase the deformation under mechanical load and relaxation can decrease the stress in the adhesives...
Natural materials exhibit anisotropy with variations in soluble factors, cell distribution, and matrix properties. The ability to recreate the heterogeneity of the natural materials is a major challenge for investigating cell-material interactions and for developing biomimetic materials. Here we present a generic fluidic approach using convection and alternating flow to rapidly generate multi-centimeter...
Cranioplasty is a commonly performed procedure. Outcomes can be improved by the use of patient specific implants, however, high costs limit their accessibility. This paper presents a low cost alternative technique to create patient specific polymethylmethacrylate (PMMA) implants using rapid prototyped mold template. We used available patient's CT-scans, one dataset without craniotomy and one with...
Monodisperse CeO2 nanospheres were synthesized by hydrothermal treatment of Ce(NO3)3??6H2O using polyvinylpyrrolidone (PVP) as a surfactant. The structure and morphology of the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM) and Raman spectroscopy. The optical properties of the nanospheres were determined...
Thermosetting polymers are widely used in electronic industry as encapsulants of electronic devices. It is well known that properties of polymers and polymer-based composites like molding compounds are highly dependent on conditions like: temperature, time, humidity, degree of cure etc. These effects are investigated extensively in the past. Surprisingly, the effect of postcure and thermal aging on...
With our recent advances in polydimethylsiloxane (PDMS) based conformable microelectrode array (MEA) technologies, numerous exciting prosthetic applications involving neural/muscular surface recording and/or stimulation techniques become more accessible. As a pilot investigation, in this paper, we explore the general concept of recording-triggered surface stimulation, which may find instances in many...
This study investigate the potential biomedical application of micro/nano-aperture membrane fabricated with Polytetrafluoroethylene (PTFE). Experimental work is carried out to examine the membrane's sound transmission/absorption characteristics under the condition of different aperture diameter, thickness and cavity depth of tube. It is discovered that when there is no air layer besides the tested...
Modification to surface texture of biomaterials, protein adsorption and interactions of biomaterials and cells have been studied in vitro for several decades in tissue engineering. However, few reports focus on the decoration of in vivo environment to implanted biomaterials and the effects of the decoration on cells proliferation and wound healing. In this study, we used porous silk fibroin materials...
X-ray imaging is of paramount importance for clinical and preclinical imaging but it is fundamentally restricted by the attenuation-based contrast mechanism, which has remained essentially the same since Roentgen's discovery a century ago. Different from the conventional method based on the attenuation contrast mechanism, X-ray phase-contrast imaging (XPCI) is proposed for the study of biological...
In this study, a calcium phosphate cement was developed, which was injectable and could be molded into any desired shape. The powder component consisted of an equimolar mixture of tetracalcium phosphate and dicalcium phosphate anhydrous. The liquid component consisted of chitosan (3 wt%), citric acid (5 wt%) and glucose (15 wt%) solution. The mechanical properties and biocompatibility of the cement...
It is a well recognized practice to apply some sort of acoustic absorber material at the ends of the piezoelectric surface and also on certain portions of the metal transducers as well as the multi-strip coupler of an IF SAW filter. By absorbing undesired modes of the surface acoustic wave, this technique significantly enhances both the frequency response of the filter as well as the sidelobes and...
It is very important that researching the rule between the burst-effect of PELE and impact velocity and target thickness, especially for deeply searching the mechanism of PELE and enhancing it's damage efficiency. In this experiment, 35 GrMnSiA and nylon were respectively adopted as the shell and the core of PELE for the first time, the projectiles vertically impacted armor plates range from 5 mm...
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