Photo-Induced Multiple-State Memory Behaviour in Non-Volatile Bipolar Resistive-Switching Devices.

The recent discovery of non-volatile resistive-switching memory is a promising phenomenon for the semiconductor industry and electronic device technology. In our work, CaWO4 nanoparticles were synthesised through a one-step hydrothermal reaction. A resistive-switching memory device with Ag/CaWO4/fluorine-doped tin oxide structure was prepared.

Influences of Electromagnetic Energy on Bio-Energy Transport through Protein Molecules in Living Systems and Its Experimental Evidence.

The influences of electromagnetic fields (EMFs) on bio-energy transport and its mechanism of changes are investigated through analytic and numerical simulation and experimentation. Bio-energy transport along protein molecules is performed by soliton movement caused by the dipole-dipole electric interactions between neighboring amino acid residues. As such, EMFs can affect the structure of protein molecules and change the properties of the bio-energy transported in living systems.

[Preparation and Characterization of Manganese and Fluorine Co-Modified Hydroxyapatite Composite Coating].

Titanium and titanium alloys have been widely used as orthopedic, dental implants and cardiovascular stents owing to their superior physical properties. However, titanium surface is inherently bio-inert, thus could not form efficient osseointegration with surrounding bone tissue. Therefore, to improve the surface property of titanium implant is significantly important in clinical application.

[Preparation of chitosan/strontium-substituted hydroxyapatite films on titanium and its FTIR characteristics].

Chitosan/strontium-substituted hydroxyapatite (CHI/SrHAP) coatings were prepared on titanium substrate by electrochemical deposition technique containing Sr2+, Ca2+, PO4(3-) and Chitosan. The as-prepared coatings were examined by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) tests. The results indicate that the CHI/SrHAP coatings take the morphology of flake-like rather than the needle-like crystal , and the composite coating becomes more compact.

[Study of adsorption and desorption of behaviors of Pb2+ on thiol-modified bentonite by flame atomic absorption spectrometry].

A comparative analysis of the functional groups and surface structure of the Ca-bentonite (RB) and thiol-modified bentonite (TMB) were characterized by means of FTIR and SEM. The absorptive property of Pb2+ on TMB and RB and its influential factors was studied and the conditions for the adsorption were optimized by using FAAS method. Then the conditions for desorption of Pb2+ from the TMB by using simulated acid rain were studied and the contrast analysis of absorptive stability of Pb2+ on TMB and RB was given.

Characterisation, corrosion resistance and in vitro bioactivity of manganese-doped hydroxyapatite films electrodeposited on titanium.

This work elucidated the corrosion resistance and in vitro bioactivity of electroplated manganese-doped hydroxyapatite (MnHAp) film on NaOH-treated titanium (Ti). The NaOH treatment process was performed on Ti surface to enhance the adhesion of the MnHAp coating on Ti. Scanning electron microscopy images showed that the MnHAp coating had needle-like apatite crystals, and the approximately 10 μm thick layer was denser than HAp.

[Effects of PEMF on fluorescence spectra of rats serum].

To investigate the relationship between the fluorescence spectra of serum and the brain injury effect, the alteration of fluorescence emission in serum was collected by fluotescence spectroscopy, the pathologic changes in the rat brain were obvious by histopathology after exposure to PEMF. Sprague-Dawley male rats were randomized into sham exposed and PEMFs exposed groups. After exposure to PEMF (3.

[Preparation of fluoridated hydroxyapatite coatings on titanium by electrolytic deposition and its FTIR characteristics].

Fluoridated hydroxyapatite coatings (FHAP) were prepared on titanium substrate by electrochemical deposition technique containing Ca2+, PO4(3-), and F(-) ions. The deposition was all conducted at a constant current of 0.9 mA for 60 min at 60 degrees C.

[FTIR spectra investigation of rat sensitive tissues exposure to ELF-EMF].

Nonthermal effects of extremely low frequency electromagnetic fields (ELF-EMF) are related to changes in the microstructure of biological tissues after exposure to electromagnetic radiation. Fourier transform infrared spectroscopy (FTIR) analysis method can effectively study the mechanisms of biological effects of electromagnetic radiation. The present paper studies the characteristics of sensitive tissues of rat after ELF-EMF exposure.

Physical properties of nano-HAs/ZrO2 coating on surface of titanium materials used in dental-implants and its biological compatibility.

A gradient composite coating on the surface of titanium materials, which are used in dental implants, is prepared using an electric-chemical method. The physical properties of the composite coating and its strength of combining with titanium material are studied by the scanning electron microscope, energy dispersive spectrum and X-ray diffraction analysis, etc. The results show that the nanohydroxyapatite/ZrO2 composite coating is uniformly deposited and formed on the surface of titanium materials, its strength of combining with titanium surface reaches 16.

Investigation of biological property of nanohydroxyapatite materials.

The biological effects of nanohydroxyapatites and its cell toxicity have been studied using the MTT and ALP method, infrared spectrum of absorption and electrophoresis method, respectively. The nanohydroxyapatites are prepared and made by using sol-gel method, in which the parameters of process and reaction are controlled as: pH > 9, Ca/P = 1.67, sintering temperature of 1100 degrees C and sintering time 2 hours.

The properties of bio-energy transport and influence of structure nonuniformity and temperature of systems on energy transport along polypeptide chains.

A new theory of bio-energy transport along protein molecules in living systems, where the energy is released by hydrolysis of adenosine triphosphate (ATP), is proposed based on some physical and biological reasons. In the new theory, the Davydov's Hamiltonian and wave function of the systems are simultaneously modified and extended. A new interaction has been added into Davydov's Hamiltonian.

The theory of bio-energy transport in the protein molecules and its properties.

The bio-energy transport is a basic problem in life science and related to many biological processes. Therefore to establish the mechanism of bio-energy transport and its theory have an important significance. Based on different properties of structure of α-helical protein molecules some theories of bio-energy transport along the molecular chains have been proposed and established, where the energy is released by hydrolysis of adenosine triphosphate (ATP).

[Rapid detection device of bacteria drug-sensitivity using electrical impedance method].

Since the bacteria metabolites in the process of growth and reproduction of can lower the resistivity characteristics of the medium, the electrical impedance method can develop a rapid detection device of bacterial drug sensitivity. The device consists of micro-organisms impedance sensors, computer systems, signal generator, resistance Anti-detection circuit, the time allocation controller, constant temperature incubator and auxiliary circuits and other components. It measures the electrical impedance of the medium, and bacteria in the culture period to obtain the impedance value of the monitor into the impedance curve.

[Electrical impedance method for bacteriological study of drug sensitivity test].

In this study, our self-made micro-electrical impedance sensors and experimental apparatus were used to measure the impedance of bacteria-inoculated medium. Then the bacteria in the culture of all values obtained during the period were recorded into the trace impedance curve. Seeing the obvious difference in morphological change, we utilized the differed impedance curves in an attempt to estimate the morphological difference between the drug sensitivity of bacteria.

Biosorption of uranium by Saccharomyces cerevisiae and surface interactions under culture conditions.

Few studies have focused on biosorption by microorganisms under culture conditions. To explore the biosorption of uranium by Saccharomyces cerevisiae under culture conditions, the S. cerevisiae growth curve, biosorption capacity and surface interaction under batch culture conditions were investigated in this study.

[Effects of redox state of disulfide bonds on the intrinsic fluorescence and denaturation of Trx-fused gibberellin-induced cysteine-rich protein from Gymnadnia conopsea].

In the present paper, thioredoxin-fused gibberellin-induced cysteine-rich protein from Gymnadnia conopsea, desigated as Trx-GcGASA and expressed prokaryotically, was purified and identified by using Ni(2+) -NTA affinity chromatography column and SDS-PAGE, and then its intrinsic fluorescence was investigated in the absence and presence of dithiothreitol (DTT), oxidized glutathione (GSSG), peroxide and guanidine hydrochloride (GdnHCl) by means of steady-state fluorescence spectroscopic methods. It was found that (1) at the neutral pH Trx-GcGASA had maximum fluorescence emission at 305 nm following excitation at different wavelengths varying from 250 to 280 nm, which was ascribed to the fluorescence emission from tyrosine residues. (2) The reduction of disulphide bonds lead to the changes in the relative fluorescence intensity between tyrosine and tryptophan residues from 0.

[Coherence resonance of a nonlinear neuron model].

Based on a nonlinear neuron model, the Poisson noise is used to imitate the noisy environments of neurons, and, further, the phenomenon of coherence resonance (CR) of a nonlinear neuron model subject to a voltage-gated channel noise and a random point trains synaptic noise is investigated. Based on the fractional noise theory and Euler schemes, the evolution of the membrane potential and the coefficient of variation (CV) of the interval-spike-interval of the neuron firing have been obtained. It is shown that, in the absence of external periodic signal, such CV can be decreased at a certain intensity of neurotransmitter arrivals trains lambda and a proper strength of the voltage-gated channel noise D, so that the coherence of the system is maximal and the phenomenon of CR can take place.

[Study on testicle tissue of rats in extremely low frequency electromagnetic fields].

The testicle tissue's pathological changes of Wistar rats in low frequency electromagnetic fields were observed and analyzed by Fourier transform infrared (FTIR) spectroscopy. The components of secondary structure were examined by use of derivative and curve-fitting techniques. The results showed some significant differences between the exposed group and the sham-exposed group on spectra.

Synthesis of magnetic nanobiomaterials and its biological effects.

Iron oxides and its hydrate nanoparticles, for example, nanoFe3O4 and nanoFe3O4 with hydroxyl, were synthesized by hydrothermal method, their sizes and features are evaluated by infrared spectra and Scanning Electron Microscope (SEM) etc. The dimensions of these nanoparticles produced are about 50-120 nm. In the investigation of influence of nanoFe3O4 and nanoFe3O4 with hydroxyl on crystalline states of amino acid molecules, their crystalline forms are different to that of pure amino acid molecules.

A model for separation and melting of deoxyribonucleic acid in replication and transcription processes.

In order to explain the denaturation and melting in replication and transcription of deoxyribonucleic acid (DNA) at physiological temperature, we propose a dynamical model on the basis of structure and motion of DNA under the actions of energy released in hydrolysis of adenosine triphosphate (ATP) and enzymes. The model admits three degrees of freedom per base pair: two displacement variables associated with the vibrations of hydrogen atom in the hydrogen bonds and base (nucleotide), respectively, and an angular variable describing the rotation of base. The important role of hydrogen atom in the hydrogen bonds is stressed in this model.

[Study on effects of bioelectric parameters of rats in electromagnetic radiation of HV transmission line].

With the development of economy and coming of information era, the chance of exposure to electromagnetic fields with various frequencies has been increased for every human. The effects of electromagnetic radiattion on human being's health are versatile. To study the effects of bioelctronic parameters of rats in the electromagnetic radiations of HV transmission line, EEG, ECG and CMAP were measured in rats exposed to simulating high-voltage transmission line electromagnetic radiation for over one year.