Host selection environmental factors

The third example considered the interaction of life-history traits (survival rates, fecundity, immunogenicity) with an environmental factor specific to parasites, namely the host immune system. Here phenotypic diversity in response to environmental conditions (host immunity) is not so readily apparent. To observe phenotypic diversity, different parasite lines need to be compared in their kinetics of infection and, to show immune-dependence, these must be complemented by control experiments in immunosuppressed hosts. Experiments seeking to select on this diversity... 

The behavior of Insects In selecting a host plant for food and shelter is affected by a wide array of physical and chemical stimuli. Chemicals that play a role in resistance mechanisms may interfere with an Insect s orientation, inhibit feeding, or deter ovipositlon. Most of the known mechanisms of resistance involve feeding deterrents, but the most vulnerable phase of the Insect life cycle may prove to be ovipositlon. Environmental factors may influence the ability... 

Whether a bacterial population behaves pathogenically or not will be a function of that component species genetics, the restraints which other members in the community are able to impose, and the result of any overriding selection pressures dictated by environmental factors governing habitat type and host predisposition to disease. 

No loss of resin to environment, high selectivity for target species, large scale operation feasible, minimal environmental effects, continuous automated operation, hydrophilic or hydro-phobic support, rapid kinetics Selectivity for target species by host carrier, large separation factors possible, rapid kinetics Minimal environmental effects, low cost... 

While most studies on supramolecular photochemistry have focused on the design and synthesis of suitable hosts that provide desirable interaction or enviromnent for aimed photosubstrates, recent studies by Inoue et al. suggest that the external factors, such as temperature, solvent and pressure, may also play a crucial role in controlling the reactivity and selectivity of photoreactions in supramolecular systems. Changing environmental variants, which is much easier to practice than the optimization of host structure involving tedious syntheses, can provide not only a convenient, yet useful, tool for controlhng photochemical outcomes, but also important information regarding the mechanism of supramolecular photochemical reaction. 

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