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Control-effective flux(CEF) analysis is a useful tool in assessing a metabolism. In this work, a model that utilizes existing knowledge of oxygen and redox sensing/regulatory system to assist elementary flux modes (EFMs), has been developed and CEF analysis was performed to analyze the influence of oxygen level on the transcriptional regulation in Klebsiella pneumoniae. It was found that the efficiency...
Deoiled Jatropha curcas seed meal (DJSM), a chief waste material of oil extraction industry, will be generated on a large scale due to the growing interest in using Jatropha curcas seed oil as a feedstock for the production of biodiesel. Up to now, there is very little work on viable approach for the use of DJSM to the best of our knowledge. This article reports our studies on the utilization of this...
Nickel (Ni) plays an important role in the growth of plants, but it is also a kind of heavy metal which can easily enrich in soil and exert toxic effect on plants. To evaluate the Ni stress on the maize growth, a pot experiment was conducted by black soils sampled from the field in the middle of Jilin province. And Ni was equilibrated in the soils to graded levels from 0 to 800mg kg-1 soil. The main...
Chinese medicinal insects were added into the media to investigate their effects on the mycelial growth and polysaccharide formation by Ganoderma lucidum SCIM 0819. The experiments were carried out in submerged fermentation using shake flasks. The results show that addition of C. molossus at 5.0 g/L lead to significant increase in intracellular polysaccharides (IPS) concentration from 1.48 ± 0.12...
In this study, a novel ameliorant, calcined by a mixture of dry and semi-dry desulfurization residue and K-feldspar, was used to ameliorate acidic crimson soil which was widely distributed in South China. Application rates of the ameliorant were 0, 3.4, 6.8, 10.2 mg per hectare (ha) sweet corn fields, respectively. The planting test lasted a season. The height and perimeter of the sweet corn were...
Heavy metal pollution is a worldwide problem. Phytoremediation is an effective and low-cost interesting technology. Sugarcane (Saccharum officinarum L.) could be a promising candidate for phytoremediation on metal-contaminated soils due to its high biomass, faster growth and moderate takeup and accumulation of heavy metals such as Cu, Cd, Se, Pb and Mn. As a follow-up processing of sugarcane, bagasse...
Bamboo is so easy to moulding that bamboo products haven't been high value added utilization. Therefore, the effect of wood extractives molecules on bamboo biology moulding was studied based on full-factor test. The result is: (1) The effect of tree species of wood extractives on bamboo biomass moulding was highly remarkable. The effect of treatment time on bamboo biology moulding was not remarkable...
The phenol-polluted air was degraded by aerobic granules at a high phenol loading rate and the characteristics of aerobic granules were investigated. The morphology and structure of aerobic granule changed greatly when they degraded phenol-polluted air. The white bamboo-shaped filamentous bacteria grown were completely covered on the surface of aerobic granules at the phenol loading rate of 1.5 kg...
In this paper, alkaline hydrothermal experiments of glucose, fructose and xylose, the model compounds of carbohydrate biomass, were conducted in a batch reactor in the temperature range of 250 to 350°C to examine the production of lactic acid. Result showed that the formation of lactic acid in a hydrothermal reaction of glucose, fructose and xylose could be promoted notably by using NaOH, KOH and...
Immobilized microorganism technology is an effective method of removing water pollutant in source waters. The effect of biologically immobilized ceramic particles is better in removing the pollutant than simple filter or engineering bacteria liquid, due to the two factors including the adsorption and entrapment function of the filter materials in the biofilter and the biodegradation of the microorganisms...
Biosorption of organic pollutants, expressed as COD, by aerobic and anaerobic sludge was conducted to examine equilibrium and kinetic models. Freundlich and Langmuir models were mostly used for mathematical description of the biosorption equilibrium. Freundlich equation was more fit to describe the equilibrium of biosorption process in this study. Under the same experimental condition, biosorptive...
Microalgae is a form of prospective biomass energy. Cultivation of wild mixed microalgae is not only develop a new way for biomass energy production, but reduce the emission of carbon dioxide in flue gas, which is important to the alleviation of global climate change. In this study, wild mixed microalgae were cultivated in an airlift photo reactor. The effects of carbon oxide concentration, condition...
Concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in surface sediments collected from the Jiaozhou Bay were measured by GC-FID. The results showed that the total concentrations of PAHs varied from 1242.2 to 29558.1 ng g-1 (average concentration was 5065.1 ng g-1), which indicated that the total PAHs concentrations were at moderate level compared to relevant areas worldwide. The proportion...
The pretreated brown algae Laminaria japonica was used to adsorb and desorb Au2+, Ag+, Cu2+ and Ni2+ ions from electroplating wastewater in this article. The results indicated that the biosorption process of Au2+, Ag+, Cu2+ and Ni2+ ions could be divided into two steps. The first step was physical adsorption and reached equilibrium quickly, in less than 15 min. This adsorption process followed the...
Some filamentous fungi were screened as potential oleaginous microorganisms for production of microbial lipid. The results showed that filamentous fungus Strain SCIM04 displayed the most potential ability in producing microbial lipid, the lipid content of cells reached 50.93%, and the lipid yield was 8.4±0.42 g /L. Furthermore, the components profile of the lipid were analyzed. The results revealed...
In this paper, start-up of fiber activated carbon for natural start-up in a dynamic flow was discussed, and several physical-chemical, biochemical and microbiological methods (indicators), such as NH3-N, NO2-N, UV254, CODMn, DOC and AOC, were used to characterize the BAC biofilm's composition and activity. The results showed that the mature biofilm was observed after 53 days of incessant operation...
The filter media dimensions are the key design parameter in filter system. In this study, the ceramic pellets with diameter of 3-5 mm, 6-9 mm and 10-13 mm were employed in the vermifilters of D1, D2 and D3, respectively, for excess sludge treatment. The aim of this study was to optimize the diameter of filter media based on the stabilization degree of excess sludge and the corresponding physiological...
Sediments microbial communities in aquatic environments are important because they are fundamental to biogeochemical and energy cycling, productivity as well as "buffering" capacity of aquatic ecosystems. We collected sediment samples from four stations characterized by different aquatic environmental conditions during two periods of times and investigated effects of nutrient factors on...
This study was carried out to apply short-term shock load to investigate and compare microbial responses and interactions of submerged aerated filters (SAFs) with wool and Kaldnes. It was presented that the results from a transient hydraulic shock of reducing the hydraulic retention time (HRT) by half to a HRT of 1.0 hours for 2.0 hours and followed by a return to the steady state. At the beginning...
Four inorganic packing materials were evaluated in terms of their availability as a packing material in trickle-bed air biofilter (TBAB) of biological NH3 removal characteristics. The nitrification rate is in the order of zeolite > active carbon > ceramic pellets > multi-face ball. The highest nitrification rate for zeolite, polypropylene multi-face ball, ceramic pellets and active carbon...
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