منابع مشابه
Respiratory Biology: They Would Be Giants
A recent study has shown that respiratory structures are disproportionately oversized in larger insects, and that oxygen supply to leg muscles may be physically constrained in the largest modern insects. High oxygen concentrations during the Carboniferous may have alleviated these physical constraints allowing the evolution of gigantic arthropods.
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Background and Aim: Human-information interaction, either in every day life or in research approaches, depends on pre-assumptions about “what information is”. Sometimes this pre-assumptions become axiomtic in a way that we must return to primary concerns about them to explore new social phenomenas. Information as an object is one of pre-assumptions. In this paper, the mentioned pre-assumptions ...
متن کاملWhich method of teaching would be better cooperative or lecture?
Introduction: Most of the knowledge acquired through lecturing is forgotten rapidly. As dentistry is becoming a more complicated field of study and as new techniques are introduced, the use of modern educational approaches to promote lifelong learning becomes necessary. This study is to compare cooperative teaching method and lecture method in terms of their impact on students' learning and the...
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While less appreciated than the ubiquitous process of cell fission (division), cell fusion events play crucial roles in all walks of life. In vertebrates, the multinucleated product of cell—cell fusion, referred to as a syncytium, is central to the structure and function of tissue types like skeletal muscle fibers and the fetal—maternal barrier in the placenta [1]. Syncytia have also been linke...
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Beginning with the earliest expeditions to the poles, over 100 years ago, scientists have compiled an impressive list of polar taxa whose body sizes are unusually large. This phenomenon has become known as 'polar gigantism'. In the intervening years, biologists have proposed a multitude of hypotheses to explain polar gigantism. These hypotheses run the gamut from invoking release from physical ...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2007
ISSN: 0960-9822
DOI: 10.1016/j.cub.2007.09.019