The results of single-factor experiment showed that insoluble corncob xylan was the best carbon source and inducer, beef peptone was the best nitrogen source, the optimal initial pH value and cultivation temperature were 6.0 and 40 ℃, respectively.
The result showed that when sucrose as carbon source,peptone or peptone plus beef paste as nitrogen source,original pH 6.0,the GABA production of As-8 strain could reach higher yield(4.2g/L) and was genetic stable after growing up to 15 generations.
The results showed that the optimal carbon source was glucose,the optimal nitrogen source was peptone,the optimal nitrogen concentration was 2% and the optimal metallic ion was Mn2+ for Y9 SOD producing.
The effects of different factors on xylanase production by Streptomyces olivaceoviridis E-86 were also studied in shake flask condition. The best initial pH value of growth medium for xylanase production was at pH6.0. Corn cob xylan and beef peptone were the best C source and N source, respectively.
To produce arachidonic acid (AA) and eicosapentaenoic acid (EPA) by organic wastewater of soybean products, the effects on the AA and EPA yield of culturing time, carbon resource concentration, nitrogen resource concentration and dilution times were studied.
The optimum fermenting temperature,initial pH,the concentration of fermentable sugar,nitrogen resource,dosage of nitrogen resource,fermenting period and translated ratio of fermentation were 35℃,6.8,14%(w/v),NH4NO3 0.6%(w/v),87hours and 90.8% respectively.
Plant species frequently well adapt to their original "nutrition habitat" during a long process of evolution, and the apparent preference for ammonium or nitrate nitrogen source (NH4+ or NO3-) might be an important aspect of the adaptation.
Nitrate has been recognized as the dominant mineral nitrogen form in most agricultural soils and the main nitrogen source for crops, but it is not usually the case in forest ecosystems.
We studied the effects of nitrogen source, initial pH, temperature, incubation time, medium composition, and surfactants on cellulase production.
The content of γ-linoleic acid was higher when carbohydrates (glucose and molasses) were used as carbon sources and urea was used as a nitrogen source.
It has been found that the bioSF yield and emulsification index for various hydrocarbons depend on the kind of the nitrogen source used by the bacterium, increasing with replacement of KNO3 by NaNO3.
Effects of N source and nitrification pretreatment on growth of Arthrospira platensis in human urine
NO3-N was the proper N source, in comparison with other N source, including urea, NH4-N and NO2-N.
Nitrogen (N) source changes, the absence of phosphorus (P), calcium (Ca), and cobalt (Co), and the increase in the sucrose content of the medium increased the level of alkaloids inDatura stramonium hairy root cultures.
The use of ammoniun as N source provoked the alkaloid excretion into the medium.
capsulatus B10, which are affected innifHDK, nifR1, ornifR4 genes, unable to fix dinitrogen, do not grow with 2-amino-4-nitrophenol as the sole N source.