منابع مشابه
Make No Bones about It: Long Bones Scale Isometrically
Long bones are far from being simple cylinders, so how is the relative positioning of their various features maintained during growth? A new study shows that growth is isometric and that drift from the correct position is minimized. Read the Research Article.
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Photogenic predator: Coeloid cephalopods, a group of shell-less molluscs, evolved at around the time when vertebrates started to conquer land. As visual predators, they competed against early fi shes and developed remarkable complexity of body and behaviour. The photo shows the octopus Wunderpus photogenicus, found in shallow waters from Indonesia to the Philippines. (Photo: Roy L. Caldwell.) F...
متن کاملThe Krapina Occipital Bones
The Krapina fossils are the largest collection of Neandertals known, representing a unique opportunity to examine Neandertal variation at a single place and time. Because of the nature of the assemblage, knowledge about the collection as a whole must be obtained from the analyses of the individual skeletal elements. In this work I present a summary of a subset of the Krapina fragments, the occi...
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Erythropoietin (EPO) is a glycoprotein that is critical for the regulation of red blood cell production. During embryonic development, Epo is mainly expressed in the fetal liver. However, as hematopoiesis switches sites from the fetal liver to the bone marrow, peritublular interstitial cells of the kidney support EPO production. Epo expression is tightly regulated by spatial, temporal and envir...
متن کاملBones, genes and fractures
Osteoporosis is a complex disease characterized by a reduction in bone mass with associated bone microarchitectural deterioration and a high risk of fractures. Although environmental factors like nutrition and mechanical load, as well as lifestyle, may influence the development of the disease, family and twin pair studies have suggested that there is also a strong genetic component in a predisp...
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ژورنال
عنوان ژورنال: Annals of Surgery
سال: 1902
ISSN: 0003-4932
DOI: 10.1097/00000658-190212000-00016