Microbial interaction

Howden, A.J.M. and Preston, G.M. (2009). Nitrilase enzymes and their role in plant-microbe interactions. Microbial Biotechnology, 2, 441-451. 

Key words host/microbe interactions, microbial community organization, probiotics, prebiotics, sustainable. 

Microbial Transformations and Interactions with the Xenobiotic Metabolizing Enzyme (XME) System... 

Figure 7.10 Simplified scheme for the biosynthesis of xanthan. Adapted from Exopolysaccharides in Plant Bacterial Interactions. J A Leight and D L Coplin. Annu Rev Microbial 1992 46 pp 307-46 (see text).

When microbial cells are incubated into a batch culture containing fresh culture media, their increase in concentration can be monitored. It is common to use the cell dry weight as a measurement of cell concentration. The simplest relationships describing exponential cell growth are unstructured models. Unstructured models view the cell as an entity in solution, which interacts with the environment. One of the simplest models is that of Malthus 19... 

Wang et al.2 and Najafpour et al.3A worked with immobilised microbial cells of Nitrobacer agilis, Saccharomyces cerevisiae and Pseudomonas aeruginosa in gel beads, respectively. They found separately that the cells retained more than 90% of their activity after immobilisation by using specific oxygen uptake rate (SOUR) [mg 02g 1 (dry biomass) h 11 as the biomass activity indicator. Such differences in immobilised biomass and activity between free and immobilised biomass activities depend strongly on the particular characteristics of the microbial systems and their interaction with the support matrix. 

Lewis DL, Hodson RE, Freeman LF III. 1984. Effects of microbial community interactions on transformation rates of xenobiotic chemicals. Appl Environ Microbiol 48 561-565. 

Davydova, O., Deryabin, D., Nikiyan, A., El-Registan, G. Mechanisms of interaction between DNA and chemical analogues of microbial anabiosis autoinducers. 

E1 Beit lOD, Wheelock JV, Cotton DE. 1981b. Pesticide-microbial interaction in the soil. IntJ Environ Stud 16 171-179. 

Microbial cells transported with the stream of fluid above the surface interact with conditioning films. Immediately after attachment, microorganisms initiate production of slimy adhesive substances, predominantly exopolysaccharides (EPS) that assist the formation of microcolonies and microbial films. EPS create bridges for microbial cells to the substratum and permit negatively charged bacteria to adhere to both negatively and positively charged surfaces. EPS may also control interfacial chemistry at the mineral/biofilm interface. 

Reanney DC, PC Gowland, JH Slater (1983) Genetic interactions among microbial commnnities. Symp Soc Gen Microbiol 34 379-421. 

Wolin MJ (1982) Hydrogen transfer in microbial communities. In Microbial interactions and communities (Eds AT Bull, JH Slater), Vol. 1, pp. 323-356. Academic Press, New York. 

Cerniglia CE, DW Kelley, JP Freeman, DW Miller (1986) Microbial metabolism of pyrene. Chem-Biol Interactions 57 203-216. 

The microorganisms do not necessarily always form the same metabolites as humans in a similar manner, but they can be useful for studies of drug interactions, disposition, etc. [11]. Although there is no correlation between the mammahan and microbial isozymes, the mechanism involved in microorganisms is still unknown, but may be similar to that involved in animals. Additionally, the fungal metabohsm of the compounds is often affected by the concentration, nutritional factors, inducers, and environmental factors [12]. 

In some cases, catechins can also act in synergistic mode when used in association with currently used antibiotic molecules (Table 2). EGCG exhibited synergy with /3-lactams. Sudano Roccaro et al. [73] found that this compound is able to reverse tetracycline resistance in Staphylococcus epidermidis and S. aureus isolates. This synergistic interaction has been explained by inhibition of tetracycline efflux pump activity in microbial cells resulting in an... 

Since his early pioneering work on the rhizosphere (a term Hiltner used to describe specifically the interaction between bacteria and legume roots), our knowledge of the subject has greatly increased, and today perhaps a more appropriate definition of the rhizosphere is the field of action or influence of a root (1). The rhizosphere is generally considered to be a narrow zone of soil subject to the influence of living roots, where root exudates stimulate or inhibit microbial populations and their activities. The rhizoplane or root surface also provides a... 

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