The strong acid tolerance of EHEC O157:H7 strain 97063 at pH 2.5 could stand 29h compared with other strains. The study was carried on the acid tolerance of internal EHEC O157:H7, so as to find ways of controlling the infection of EHEC O157:H7 and to provide data on the scientific basis.
In this research,the acid-resistant and heat-stable α-amylase mutation gene(amyd) and heat-stable α-amylase gene(amy) were cloned into expression vector pET-30a constituting recombination vector pET-amdy and pET-amy which were transformed into BL21(DE3).
The result showed that 166 protease had more stronger acid-resistant property than AS1.398 protease. And the inhibition of AS1.398 protease (or 166 protease) activity in pigskin could be achieved by disposal in the 0.2M Na2HPO4 -citric buffering solution (or 0.1N HC1) including 8% NaCl twice.
The cross-linking hydroxypropyl starch has better properties in freeze-thaw stability, paste transparence and acid-resisting than that of original starch.
The studies indicate that Tamarindus indica has a relatively high content of minerals and amino acids, much more than most of other raw materials of fruits and vegetables, and a better result can be reached in the process of extraction provided that five times water is added in accordance with the weight of raw material under 85℃ for 30 minutes and acid-resisting CMC-Na is used as stabilizer.
The results showed that when the density of theα-amylase was below0.015%,and the temperature was between60℃and65℃,and the time of reaction was between0and8minutes,the staling -inhibition property,acid -resisting and anti -precipitability of this product improved g reatly.
This paper reports on the study of acid tolerance of lactic acid bacteria as a property of cells, determining their ability to divide efficiently and retain viability under conditions of increased nutrient medium acidity during bacterial growth.
Bacteria of the strain STE05 lacked acid tolerance (at pH below 6.5, growth was retarded, and pH 5.0 was the lowest value at which the cells remained viable).
Acid tolerance is inherited in a stable manner and retained by the segregants of TV2 strain obtained in the course of long-term storage of the bacteria.
The calditol with an ether linkage in the molecule suggested an important role regarding the properties of heat-resistance and acid-resistance observed inSulfolobales.
Recently, it was reported that another two-component system termed CrdRS (HP1365-HP1364) is required for pH-responsive regulation of the major acid-resistance systems in the H.
The experiment shows that the TiO2/CuO coating is more heat-resistant, acid-resistant, and wear resistant than CuO coating, without losing absorptivity markedly.
The influence of the hydrogen-ion concentration on the growth and metabolism of a highly acid-resistant green alga, Chlorella ellipsoidea (strain Marburg St), was studied.
The REFISH (Restoring Endangered Fish In Stressed Habitats) Project was established in 1988 to assess acid-tolerance among indigenous Norwegian strains of brown trout.
Special adaptations, including enlarged anal papillae in Chironomids and the number and morphology of chloride cells in such diverse organisms as crustaceans, insect larvae, and fishes, may enhance acid-tolerance.
The Acid-tolerance index (ATI) and Nitrogen-demand index (NDI) based on Ellenberg's indicator values, and the Shannon-Wiener index were employed for characterizing the species assemblages of communities.
耐酸性
acid tolerance 
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