Anomalocaris @ EurekaMag.com
Mannheim, Germany (PRWEB) December 15, 2011
The Science Magazine EurekaMag.com publishes articles in all areas of biological science including biology, agriculture, horticulture, forestry, geography, environment and health. Drawing from this pool of scientific disciplines, it publishes articles, reviews and insights on biological topics including those which have recently become popular. Most of these reviews are included in the EurekaMag Keyword Category and in the EurekaMag Keyphrases Category of the online science magazine.
The EurekaMag.com insight into Anomalocaris covers this extinct genus of very early marine animals. Anomalocaris are stem-group arthropods characterized by a distinctive sub-millimetric arrangement of planar elements that is not found in extant arthropods or trilobites, suggesting they diverged before the last common ancestor of extant forms. Analysis of arthropod cuticle rheology suggests that Anomalocaris was a predator. It appears that some anomalocaridids actively utilized their large frontal appendages to rapidly flex trilobites during predation. Comparison with predation damage from mineralized trilobites and coprolites suggests that this method of flexing allowed durophagous predation. The presence in the Early Cambrian of durophagous, nonbiomineralized predators may have important implications for the role of predation pressure in the acquisition of mineralized cuticles and the rise of enrollment in trilobites.
Eurekamag.com presents an insight into Biome which are are climatically and geographically similar ecosystems. Some parts of the earth have more or less the same kind of abiotic and biotic factors spread over a large area, creating a typical biome (ecosystem) over that area. The EurekaMag.com Review covers Biome-BGC which is an ecophysiological process model to simulate large-scale ecosystems. One study tested four predictions for South American mammals that (1) there is a high frequency of species (stenobiomic species) restricted to a single biome, that (2) certain clades are more stenobiomic than others, that (3) there is a higher proportion of biomic specialists in biomes that underwent through major expansion-contraction alternation due to the glacial-interglacial cycles, and (3) that certain combinations of inhabited biomes occur more frequently among species than do others. The results agree with the resource-use hypothesis and, therefore, with a major role of the past climatic changes as drivers of mammalian evolution. Nevertheless, deviations from the expectations indicate the importance of differences in reproductive traits and paleobiogeographic history for the macroevolutionary processes involved. In the case of South American mammals, the Pliocene Great American Biotic Interchange strongly influences the ecological characteristics of this assemblage.
The EurekaMag.com insight into the Limbic System covers this set of brain structures including the hippocampus, amygdala, anterior thalamic nuclei, septum, limbic cortex and fornix, which support several functions including emotion, behavior, long term memory, and olfaction. The limbic system of the brain receives input from the olfactory pathways and sends efferants to the hypothalamus and the mesolimbic dopaminergic pathway. Chemical, biologic, and psychological stimuli can initiate and elicit sensitization. In turn, subsequent activation of the sensitized limbic and mesolimbic pathways can facilitate dysregulation of behavioral, autonomic, endocrine, and immune system functions. One study corroborates that slowing of the deeper structures of the limbic system is associated with affect. It also supports the neurobiological model that the right forebrain is associated with sympathetic activity and the left forebrain with the effective management of energy. Patients with major depression show structural abnormalities in the limbic system.
The Science Magazine EurekaMag.com was launched in November 1998 as the online version of the French science magazine "Eurêka - Le magazine des sciences" published since 1995. During the past decade, it has emerged as a comprehensive aggregator of information on biology, on the applied life sciences agriculture, horticulture and forestry, on the earth sciences, on the environmental sciences, and on the health sciences.
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