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, Volume 6 Issue 5   
Simultaneous removal of nitrate and heavy metals by iron metal*
HAO Zhi-wei, XU Xin-hua, JIN Jian, HE Ping, LIU Yong, WANG Da-hui
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 1-.   https://doi.org/10.1631/jzus.2005.B0307
Abstract   PDF (0KB)
Great attention should be paid now to simultaneously removing common pollutants, especially inorganic pollutants such as nitrate and heavy metals, as individual removal has been investigated extensively. Removing common pollutants simultaneously by iron metal is a very effective alternative method. Near neutral pH, heavy metals, such as copper and nickel, can be removed rapidly by iron metal, while nitrate removal very much slower than that of copper and nickel, and copper can accelerate nitrate removal when both are removed simultaneously. Even a little amount of copper can enhance nitrate removal efficiently. Different mechanisms of these contaminants removal by iron metal were also discussed.
Accumulation and ultrastructural distribution of copper in Elsholtzia splendens*
PENG Hong-yun, YANG Xiao-e, TIAN Sheng-ke
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 2-.   https://doi.org/10.1631/jzus.2005.B0311
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Copper accumulation and intracellular distribution in Elsholtzia splendens, a native Chinese Cu-tolerant and accumulating plant species, was investigated by transmission electron microscope (TEM) and gradient centrifugation techniques. Copper co
Ozonation with ultrasonic enhancement of p-nitrophenol wastewater
XU Xian-wen, SHI Hui-xiang, WANG Da-hui
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 3-.   https://doi.org/10.1631/jzus.2005.B0319
Abstract   PDF (0KB)
Synergetic effects for p-nitrophenol degradation were observed in the ozonation with ultrasonic enhancement. The enhancements of removal rate for p-nitrophenol and TOC were around 116% and 294% respectively in comparison with the individual ultrasound and ozonation systems. The synergetic phenomenon is attributed to two physicochemical mechanisms: (1) Ultrasound decomposes ozone causing augmentation of the activity of free radicals; (2) Ultrasonic wave increased the concentration of O3 in solution because of ultrasonic dispersion.
Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil*
LIAO Min, LUO Yun-kuo, ZHAO Xiao-min, Huang Chang-yong
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 4-.   https://doi.org/10.1631/jzus.2005.B0324
Abstract   PDF (0KB)
Cadmium (Cd) is ubiquitous in the human environment and has toxic effect on soil microbial biomass or its activity, including microbial biomass carbon (Cmic), dehydrogenase activity (DHA) and basal respiration (BR), etc., Cmic, DHA, BR were used
Water and heat transport in hilly red soil of southern China: I. Experiment and analysis*
LU Jun, HUANG Zhi-zhen, HAN Xiao-fei
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 5-.   https://doi.org/10.1631/jzus.2005.B0331
Abstract   PDF (0KB)
Studies on coupled transfer of soil moisture and heat have been widely carried out for decades. However, little work has been done on red soils, widespread in southern China. The simultaneous transfer of soil moisture and heat depended on soil p
Water and heat transport in hilly red soil of southern China: II. modeling and simulation*
LU Jun, HUANG Zhi-zhen, HAN Xiao-fei
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 6-.   https://doi.org/10.1631/jzus.2005.B0338
Abstract   PDF (0KB)
Simulation models of heat and water transport have not been rigorously tested for the red soils of southern China. Based on the theory of nonisothermal water-heat coupled transfer, a simulation model, programmed in Visual Basic 6.0, was develope
Multi-stage ponds-wetlands ecosystem for effective wastewater treatment*
PENG Jian-feng, WANG Bao-zhen, WANG Lin
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 7-.   https://doi.org/10.1631/jzus.2005.B0346
Abstract   PDF (0KB)
The performance of the Dongying multi-stage ponds-wetlands ecosystem was investigated in this work. Study of the removal of different pollutants (BOD5, COD, SS, TP, TN, NH3-N, etc.) in different temperature seasons and different units in this sy
Adsorption of ruthenium ions on activated charcoal: influence of temperature on the kinetics of the adsorption process
QADEER Riaz
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 8-.   https://doi.org/10.1631/jzus.2005.B0353
Abstract   PDF (0KB)
Influence of temperature on ruthenium adsorption on activated charcoal from 3 mol/L HNO3 solutions was investigated in the temperature range of 288 K to 308 K. It was observed that the rise in temperature increases the adsorption of ruthenium ions on activated charcoal and follows the kinetics of first order rate law with rate constant values 0.0564-0.0640 min-1 in the temperature range of 288 K to 308 K respectively. The activation energy for the adsorption process was found to be 1.3806 kJ/mol. Various thermodynamics quantities namely ∆H, ∆S and ∆G were computed from the equilibrium constant KC values. The results indicated a positive heat of adsorption, a positive ∆S and a negative ∆G.
Influence of surfactant concentration on counter-ion induced solubility of poly(pyridine-2,5-diyl)
IMIT Mokhtar, YAMAMOTO Takakazu, IMIN Patigul
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 10-.   https://doi.org/10.1631/jzus.2005.B0365
Abstract   PDF (0KB)
Protonating the pyridine rings of poly(pyridine-2,5-diyl) with dodecybenzenesulfonic acid and camphorsulphonic acid produces polymer materials which can be dissolved in chloroform (in contrast to the unprotonated polymer, which can only be dissolved in strong acids such as formic acid) and allows mixing the protonated polymers with other chloroform soluble conjugated polymers for use in electronic devices. The protonating behavior of poly(pyridine-2,5-diyl) with two kinds of surfactants is different in some levels. Dodecybenzenesulfonic acid has higher protonating ability than camphorsulphonic acid.
Growth mechanism of a preferentially oriented mordenite membrane
LI Gang, LIN Rui-sen, KIKUCHI Eiichi, MATSUKATA Masahiko
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 11-.   https://doi.org/10.1631/jzus.2005.B0369
Abstract   PDF (0KB)
A preferentially oriented mordenite membrane was successfully prepared on a seeded porous a-alumina support. Characterization results of XRD (X-ray diffractometer) and FE-SEM (field emission scanning electron microscope) revealed that evolutionary selection might predominantly contribute to the formation of the sharply oriented mordenite membrane. The necessary conditions under which evolutionary selection occurs are: (a) the number density of nuclei on the support surface should be high enough at the early stage; (b) the crystals should grow fastest along one direction; and (c) the zeolite layer should proceed via the successive growth of the crystals nucleated on the support surface instead of the accumulation of the crystals formed in the bulk solution.
Synthesis of acetals and ketals catalyzed by tungstosilicic acid supported on active carbon*
YANG Shui-jin, DU Xin-xian, HE Lan, SUN Ju-tang
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 12-.   https://doi.org/10.1631/jzus.2005.B0373
Abstract   PDF (0KB)
Catalytic activity of activated carbon supported tungstosilicic acid in synthesizing 2-methyl-2-ethoxycarbonylmethyl- 1,3-dioxolane, 2,4-dimethyl-2-ethoxycarbonylmethyl-1,3-dioxolane, cyclohexanone ethylene ketal, cyclohexanone 1,2-propa- nediol
Identification of candidate genes for drought stress tolerance in rice by the integration of a genetic (QTL) map with the rice genome physical map*
WANG Xu-sheng, ZHU Jun, MANSUETO Locedie, BRUSKIEWICH Richard
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 14-.   https://doi.org/10.1631/jzus.2005.B0382
Abstract   PDF (0KB)
Genetic improvement for drought stress tolerance in rice involves the quantitative nature of the trait, which reflects the additive effects of several genetic loci throughout the genome. Yield components and related traits under stressed and wel
Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature
KHAKWANI Abdul Aziz, SHIRAISHI Masaaki, ZUBAIR Muhammad, BALOCH Mohammad Safdar, NAVEED Khalid, AWAN Inayatullah
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 15-.   https://doi.org/10.1631/jzus.2005.B0389
Abstract   PDF (0KB)
To study the effect of high temperature, rice seedlings 20, 30, 40 and 50 d were kept at 5, 10, 15 and 20 cm water depth in a water pool. Meteorological findings indicated that water temperature varied up to 10 cm but became stable below this depth. Deep water inflicted higher tiller mortality, minimal increase in dry weight of aerial parts and leaf area, decrease in root length, and decrease in root dry weight especially at 20 cm water depth and produced an unbalanced T/R ratio (top versus root dry weight). However, deep water tended to increase plant length. These parameters, however, excel in shallow water. Older seedlings, with the exception of root dry weight, could not perform well compared to young seedlings in all physiological and morphological aspects. The study revealed that seedlings, particularly young ones, stand well in shallow water and can cope with high temperature.
Effects of medium composition on the production of plasmid DNA vector potentially for human gene therapy
XU Zhi-nan, SHEN Wen-he, CHEN Hao, CEN Pei-lin
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 16-.   https://doi.org/10.1631/jzus.2005.B0396
Abstract   PDF (0KB)
Plasmid vector is increasingly applied to gene therapy or gene vaccine. The production of plasmid pCMV-AP3 for cancer gene therapy was conducted in a modified MBL medium using a recombinant E. coli BL21 system. The effects of different MMBL comp
A hybrid neural network system for prediction and recognition of promoter regions in human genome*
CHEN Chuan-bo, LI Tao
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 17-.   https://doi.org/10.1631/jzus.2005.B0401
Abstract   PDF (0KB)
This paper proposes a high specificity and sensitivity algorithm called PromPredictor for recognizing promoter regions in the human genome. PromPredictor extracts compositional features and CpG islands information from genomic sequence, feeding these features as input for a hybrid neural network system (HNN) and then applies the HNN for prediction. It combines a novel promoter recognition model, coding theory, feature selection and dimensionality reduction with machine learning algorithm. Evaluation on Human chromosome 22 was ~66% in sensitivity and ~48% in specificity. Comparison with two other systems revealed that our method had superior sensitivity and specificity in predicting promoter regions. PromPredictor is written in MATLAB and requires Matlab to run. PromPredictor is freely available at http://www.whtelecom.com/Prompredictor.htm.
Statistical properties of nucleotide clusters in DNA sequences*
CHENG Jun, ZHANG Lin-xi
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 18-.   https://doi.org/10.1631/jzus.2005.B0408
Abstract   PDF (0KB)
Using the complete genome of Plasmodium falciparum 3D7 which has 14 chromosomes as an example, we have examined the distribution functions for the amount of C or G and A or T consecutively and non-overlapping blocks of m bases in this system. Th
A genetic diversity comparison between captive individuals and wild individuals of Elliot?ˉs Pheasant (Syrmaticus ellioti) using mitochondrial DNA*
JIANG Ping-ping, LANG Qiu-lei, FANG Sheng-guo, DING Ping, CHEN Li-ming
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 19-.   https://doi.org/10.1631/jzus.2005.B0413
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Maintaining genetic diversity is a major issue in conservation biology. In this study, we demonstrate the differences of genetic diversity levels between wild and captive individuals of Elliot?ˉs Pheasant Syrmaticus ellioti. Wild individuals show
Modeling water and carbon fluxes above summer maize field in North China Plain with Back-propagation neural networks*
QIN Zhong, SU Gao-li, YU Qiang, HU Bing-min, LI Jun
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 20-.   https://doi.org/10.1631/jzus.2005.B0418
Abstract   PDF (0KB)
In this work, datasets of water and carbon fluxes measured with eddy covariance technique above a summer maize field in the North China Plain were simulated with artificial neural networks (ANNs) to explore the fluxes responses to local environmental variables. The results showed that photosynthetically active radiation (PAR), vapor pressure deficit (VPD), air temperature (T) and leaf area index (LAI) were primary factors regulating both water vapor and carbon dioxide fluxes. Three-layer back-propagation neural networks (BP) could be applied to model fluxes exchange between cropland surface and atmosphere without using detailed physiological information or specific parameters of the plant.
Biomass and microbial activity in a biofilter during backwashing*
BAI Yu, ZHANG Jie, LI Yi-fan, GAO Yu-nan, LI Yong
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 21-.   https://doi.org/10.1631/jzus.2005.B0427
Abstract   PDF (0KB)
Biomass and microbial activity in backwashing processes of a biofilter for tertiary treatment were investigated. The microbial groups revealed new distribution along the biofilter depth after low flow rate backwashing for a short time. Then the start-up process was accelerated by backwashing. The biomass profile and microbial activity profile both varying with depth before and after backwashing, can be mathematically described by quadratic equations. Using the profiles, the difference of oxygen demand can be calculated to determine the airflow rate during backwashing. Combined with the difference between biofilters and rapid gravity filters, analysis of biomass and microbial activity can determine more accurately the required airflow rate during backwashing.
Restaurant emissions removal by a biofilter with immobilized bacteria*
MIAO Jian-yu, ZHENG Lian-ying, GUO Xiao-fen
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 22-.   https://doi.org/10.1631/jzus.2005.B0433
Abstract   PDF (0KB)
Pseudomonas sp. ZD8 isolated from contaminated soil was immobilized with platane wood chips to produce packing materials for a novel biofilter system utilized to control restaurant emissions. The effects of operational parameters including retention time, temperature, and inlet gas concentration on the removal efficiency and elimination capacity were evaluated. Criteria necessary for a scale-up design of the biofilter was established. High and satisfactory level of rapeseed oil smoke removal efficiency was maintained during operation and the optimal retention time was found to be 18 s corresponding to smoke removal efficiency greater than 97%. The optimal inlet rapeseed oil smoke loading was 120 mg/(m3?áh) at the upper end of the linear correlation between inlet loading and elimination capacity.
Use of 3-D magnetic resonance electrical impedance tomography in detecting human cerebral stroke: a simulation study*
GAO Nuo, ZHU Shan-an, HE Bin
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 23-.   https://doi.org/10.1631/jzus.2005.B0438
Abstract   PDF (0KB)
We have developed a new three dimensional (3-D) conductivity imaging approach and have used it to detect human brain conductivity changes corresponding to acute cerebral stroke. The proposed Magnetic Resonance Electrical Impedance Tomography (MR
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