Advanced Materials Research Vol. 365

Abstract: Bioelectrical impedance measurement is a widely used biomedical detecting technology. However, most traditional bioelectrical impedance measurement devices are bulky, expensive and lack of flexibility. In order to reduce costs, increase flexibility and maintain similar performance, a portable bioelectrical impedance measurement system was designed in this paper. The measurement front, with an ARM based microcontroller and integrated impedance converter chip as its core device, communicated with the host computer via USB bus. Based on the four-electrode technique, DFT digital demodulation and software calibration and compensation algorithm, the system realized its functions. Experimental results indicate that the system can achieve high precision bioelectrical impedance measurement. With the advantage of high integration and low-cost, the system can be widely used in household healthcare, clinics and biomedical research and testing.

Abstract: The ultra-structures of Zaocys dhumnades’s ventral scale surface were observed by the AFM (Atomic Force Microscopy), at the same time, the frictional properties between ventral scale and the stainless steel ball under different load, different velocity and different lubrication condition were investigated by mode UMT-2 of Universal Micro Materials Tester. The results show that ultra-structure of Zaocys dhumnades’s ventral scale surface is comprised of periodically arrayed micro-fibers and micro-pits, there are micro-pits at its bottom. The frictional resistance on the ventral scale surface is low under the dry friction, whose average frictional coefficient is 0.064, and the friction coefficient increases under the water or oil lubrication, while it decrease with load and velocity increase under different conditions. The reasons of the low friction resistance of ventral scale are its surface ultra-structure, hydrophobic and lower shearing strength. The investigative results provide theoretical proof of reducing adhesion and resistance for frictional surface of bionics fabrication.

Abstract: Micro Tom is a novel breed model organism of Lycopersicon esculentum Mill. It has the a short life cycle and is dwarf and miniature. Owing to these characters, the utilization of Micro Tom can decrease the period of scientific research greatly and save time and space for breeding, so its application is more and more broad. In this paper, we successfully induced the regenerated seedlings from Micro Tom to bear fruits in advance by controlling and optimizing several external conditions such as the initial height of the regenerated seedlings, the culture medium, the photoperiod and the temperatures, etc. Before maturity induction, we firstly investigated the proper methods for plantlets regeneration and got a relative complete data. In the later investigation on precocity inducing we found that the optimum inducing culture medium is MS medium supplemented with 0.1 mg/L NAA and 0.5 mg/L IBA, the proper height of seedlings is 2.0-2.5 cm, the best photoperiod is 18-20h, and the most efficient culturing temperature is 22-26°C. In this way we can get regenerated seedlings from Micro Tom in an efficient way and make them precocity in vitro.

Abstract: The essential oil was extracted by Soxhlet method with anhydrous diethyl ether from Ailanthus altissima Swingle (Sapindales: Simaroubaceae) bark, a traditional Chinese herbal plant, and its repellent and its fumigant activity was investigated against Lasioderma serricorne （Fabricius）(Coleoptera: Anobiidae) adults. A. altissima bark oil had extremely strong repellent activity against L. serricorne adults with the percentage repellency 93.7, 87.8 and 76.1% after 24, 48, and 72 h exposure, respectively. A. altissima bark oil also possessed high fumigant activity against L. serricorne adults with the corrected percentage mortality 100% at 8 µL/L air within 48 h exposure.

Abstract: This paper, according to the characteristics of the strategic environmental assessment of ecotourism, constructs the approach system of the strategic environmental assessment of ecotourism, that is, (a) identifying the environmental influence by listing; (b) making assessment of the value of ecotourist resources through the approaches of multilayer analysis and obscure overall judgment integration; (c) making prediction of the environmental influence through the analysis of bearing capacity and adopting this method to conduct practical research of ecotourist planning of Suihua in Heilongjiang Province.

Abstract: Norder to find the best high-voltage electrostatic radiation seed program, to select two different kinds of cucumbers, vegetables, paddy rice seeds, each seed be divided into 5 experimental groups, and be treated by high voltage electrostatic field (HVEF) at different field strength and time, and testing and statistics of the seeds vigour at germination stage. The results indicated that the greater the radiation field to same seed, the shorter radiation time is required, and vice versa. For each species, E•t tends to a constant (the constant is different in different species). Be proved by mathematical derivation that the HVEF radiation transport essentially energy to the seed, and then will be able to find the best way for HVEF radiation seeds. CLC number: S129 Document code: A.

Abstract: The medium and fed-batch fermentation by Saccharomyces cerevisiae S-W55 were optimized. The unpolished rice from aging paddy was used as major nutrient source to reduce the raw material cost of SAM fermentation. The unpolished rice saccharificate (URS) and yeast extract were employed as carbon source and nitrogen source, respectively. The dosages of URS and yeast extract in the medium compositions were optimized by response surface methodology (RSM). As a result, when the fermentation was carried out under the optimal conditions for URS (51.4 g/L) and yeast extract (4.74 g/L), the SAM yield reached 2.61 g/L. Some fed-batch processes by adding L-methionine (MET) were investigated. Adding MET into the fermentation broth at one time at the time of high cell density reaching 80 g/L could get better results with the optimal SAM concentration of 5.3 g/L and biomass yield of 89.1 g/L. By feeding MET into the fermentation broth at a feeding rate of 2 g/h for 5 hours at the time of high cell density reaching 80 g/L the optimal results were reached and the maximal SAM yield and biomass density were 5.82 g/L and 90.2 g/L，respectively.