It is argued that the remarkable standardization of the aminoacids that occur in the proteins of higher organisms, only twenty common ones being recognized, points to their having originated by natural selection of the most efficient rather than by the operation solely of physical and chemical laws...
The computational analysis here has shown that the evolution of gene clusters can occur under both direct and indirect selection as long as certain conditions hold. Under these conditions the selfish operon model is still viable as an explanation for the evolution of gene clusters.Ballouz...
It is shown that invasion of the parasite-free equilibrium cannot occur for virulence levels that are either too high or too low. We then incorporate a number of modifications to the model, among them the possibility that host fertility is reduced by infection, and that transmission rate ...
unavailability of equipment, supplies, spare parts, personal or other equipment, interruption in electronic communications networks, as well as in the case of the occurrence of any circumstance or event outside of the wishes of BEEMOOV which occur after the conclusion of the...
(the Organizers) a turnkey solution enabling them to create a platform for each of their events (the Event Platform) that can be accessed by registered natural persons and/or people who might be interested in the event (the Attendees) and businesses taking part in the event (the Exhibitors)...
Cattle as well as sheep and goats may be infected with parasitic nematodes of fallow deer under natural conditions, but heavy infections do not occur. Most... S Rehbein,W Haupt - 《Dtw Deutsche Tierärztliche Wochenschrift》 被引量: 34发表: 1994年 Evaluation of nutritive value and palatabili...
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essential oils as features of citrus peel. We used 55 samples as a training set to perform feature selection and built a random forest classifier. Then, we used the classifier to predict the remaining sample and recorded the importance rank for each feature. Following the testing of each ...
38, that geodiversity indices better work as a surrogate for common than rare species, which often occur in biodiversity hotspot areas. By contrast, we showed that environmental variables are fundamental to conservation planning, as they imply that the availability of specific environmental conditions ...
strong selection driving rapid adaptation to global change may also purge phenotypic plasticity from populations. Indeed, a loss of plasticity appears to be present in natural systems rapidly adapting, for example, as seen in marine to freshwater transitions in copepods19and numerous fish species23,...