We use the logistic growth model to describe the bacterium growth in the presence of a Gaussian colored noise. The effects of multiplicative colored noise on the steady state probability distribution of the bacterium growth were investigated. Our results show that increasing the strength of the multiplicative colored noise may lead to decreasing bacterium number and even bacterium extinction. O...

antibacterial effects of honeybee propolis tested on the paenibacillus larvae larvae, cause of honeybee american foulbrood disease. after cultivation of bacterium in special medium we used of two antibacterial susceptibility tests: broth dilution susceptibility test and paper disk susceptibility test. in the b.d.s.t 0.32 milligrams/ml and higher concentrations of propolis inhibited growth of th...

Growth characteristics of a cellulolytic nitrogen-fixing bacterium isolated from a marine shipworm by Waterbury et al. (J. B. Waterbury, C. B. Calloway, and R. D. Turner, Science 221:1401-1403, 1983) are described. When grown microaerobically, the bacterium exhibited doubling times of about 2 days in cellulose-supplemented synthetic medium devoid of combined nitrogen. Maximum growth was reached...

this study examined the effects of two bacteria (bacillu subtilis bp6 and lactobacillus plantarum lp3) on survival, growth and digestive tract microflora of achanthopagrus latus larvae with different delivery methods. for each bacterium was considered three treatments with different delivery methods. in first treatment, fish larvae were exposed to each bacterium through feeding them with bacter...

The pH of the medium is of vital importance to any bacterium for its growth in that medium. For any bacterium there is an optimal narrow range of pH promoting vigorous growth, and a wider range on either side of the optimum within which growth occurs less vigorously. On the other hand, metabolic processes associated with the growth of a bacteria in any fluid medium cause changes in the pH of th...

pseudomonas fluorescens utpf68, well-known biocontrol bacteria was used in this study. the volatile metabolites released from utpf68 in na, nag, pda media, could inhibit the growth of fungi p.drechsleri at the rate of 84.44, 83.55 and 67.33 percent, respectively. the results showed that antibiotics production in pda and cma media prevented the growth of p. drechsleri, 100% and 93%, respectively...

the rapid growth of industrial activity in recent decades, and non-obedience with environmental laws, along with discharging of contaminant wastewaters from petrochemical industries lead to increase of heavy metals into the environment. biosorption is an effective technology for optimal removal of pollutants such as heavy metals from marine ecosystems. in the present study, the microorganism, r...

A diesel-degrading bacterium was isolated from a diesel-contaminated site in Selangor, Malaysia. The isolate was tentatively identified as Acinetobacter sp. strain DRY12 based on partial 16S rDNA molecular phylogeny and Biolog GN microplate panels and Microlog database. Optimum growth occurred from 3 to 5% diesel and the strain was able to tolerate as high as 8% diesel. The optimal pH that supp...