منابع مشابه
Dinosaur body temperatures: the occurrence of endothermy and ectothermy
—Despite numerous studies, the thermal physiology of dinosaurs remains unresolved. Thus, perhaps the commonly asked question whether dinosaurs were ectotherms or endotherms is inappropriate, and it is more constructive to ask which dinosaurs were likely to have been endothermic and which ones ectothermic. Field data from crocodiles over a large size range show that body temperature fluctuations...
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Fungi are relatively rare causes of life-threatening systemic disease in immunologically intact mammals despite being frequent pathogens in insects, amphibians, and plants. Given that virulence is a complex trait, the capacity of certain soil fungi to infect, persist, and cause disease in animals despite no apparent requirement for animal hosts in replication or survival presents a paradox. In ...
متن کاملMammalian cortical bone in tension is non-Haversian
Cortical bone, found in the central part of long bones like femur, is known to adapt to local mechanical stresses. This adaptation has been linked exclusively with Haversian remodelling involving bone resorption and formation of secondary osteons. Compared to primary/plexiform bone, the Haversian bone has lower stiffness, fatigue strength and fracture toughness, raising the question why nature ...
متن کاملMicromechanically based poroelastic modeling of fluid flow in Haversian bone.
To explore the hypothesis that load-induced fluid flow in bone is a mechano-transduction mechanism in bone adaptation, unit cell micro-mechanical techniques are used to relate the microstructure of Haversian cortical bone to its effective poroelastic properties. Computational poroelastic models are then applied to compute in vitro Haversian fluid flows in a prismatic specimen of cortical bone d...
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Due to their extraordinary size sauropod dinosaurs are among the biologically most interesting vertebrates. Recent estimates based on photogrammetric measurements in actual skeletons or on scientific reconstructions place common sauropods consistently in the 15t to 50t category. Sauropods are tetrapods, a body similar to proboscideans (elephants) is combined with a very small head on a very lon...
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ژورنال
عنوان ژورنال: Evolution
سال: 1977
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1977.tb01028.x