منابع مشابه
Evolution: Informational Constraints on Adaptation
Many species adaptively alter offspring sex ratios, yet little is known about how they obtain relevant environmental information. New work on the parasitoid wasp Nasonia vitripennis reveals that the presence of eggs on hosts provides a reliable cue allowing females to determine the degree of local mate competition and adaptively adjust offspring sex ratios.
متن کاملCognitive Evolution of the “Human” Concept and Its Adaptation to Piaget’s Theory
Background: Cognitions and attitudes, especially anthropological attitudes, are influential in human behavior. Objectives: The present study was conducted to investigate the cognitive evolution of the human concept in elementary school female students and its adaptation to Piaget’s theory of cognitive development. Materials & Methods: The present research method is qualitative of deductive-ind...
متن کاملMorgan Dean
Introduction Landsat Thematic Mapper ( TM ) imagery was used to analyze patterns of landscape diversity in the seasonal tropical forests of northeastern Guatemala. TM radiance and the radiance coefficient of variation (CV) were significant in discriminating land-cover types. Cluster analysis of TM4, TM5, and TM7 radiance produced six distinct types of landcover. Green leaf biomass from TM4 and ...
متن کاملRestrictions on biological adaptation in language evolution.
Language acquisition and processing are governed by genetic constraints. A crucial unresolved question is how far these genetic constraints have coevolved with language, perhaps resulting in a highly specialized and species-specific language "module," and how much language acquisition and processing redeploy preexisting cognitive machinery. In the present work, we explored the circumstances und...
متن کاملType Evolution and Instance Adaptation
Schema evolution support is an important facility for object-oriented database (OODB) systems. While existing OODB systems provide for limited forms of evolution, including modiication to the database schema and reorganization of aaected instances, we nd their support insuucient. Speciic deeciencies are 1) the lack of compatibility support for old applications, and 2) the lack of ability to ins...
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ژورنال
عنوان ژورنال: Science
سال: 1904
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.19.471.74