نتایج جستجو برای: undulatory extinction
تعداد نتایج: 27447 فیلتر نتایج به سال:
The undulatory locomotion of polychaete annelid worms is studied as a biological paradigm of a versatile body morphology and effective motion control, adaptable to a large variety of unstructured and tortuous environmental conditions (water, sand, mud, sediment, etc.). Computational models of this type of locomotion have been developed, based on the Lagrangian dynamics of the system, on resisti...
OBJECTIVE To investigate the effects of a specific protocol of undulatory physical resistance training on maximal strength gains in elderly type 2 diabetics. METHODS The study included 48 subjects, aged between 60 and 85 years, of both genders. They were divided into two groups: Untrained Diabetic Elderly (n=19) with those who were not subjected to physical training and Trained Diabetic Elder...
Undulatory locomotion is studied as a biological paradigm of versatile body morphology and effective motion control, adaptable to a large variety of unstructured and tortuous environmental conditions (e.g. the polychaete annelid worms move equally efficiently in water, sand, mud and sediment). Computational models of this type of locomotion have been developed, based on the Lagrangian dynamics ...
Recent work has shown that muddy sediments are elastic solids through which animals extend burrows by fracture, whereas non-cohesive granular sands fluidize around some burrowers. These different mechanical responses are reflected in the morphologies and behaviours of their respective inhabitants. However, Armandia brevis, a mud-burrowing opheliid polychaete, lacks an expansible anterior consis...
The optimisation of undulatory underwater swimming is highly important in competitive swimming performance. Nineteen kinematic variables were identified from previous research undertaken to assess undulatory underwater swimming performance. The purpose of the present study was to determine which kinematic variables were key to the production of maximal undulatory underwater swimming velocity. K...
This paper studies the mechanics of undulatory locomotion. This type of locomotion is generated by a coupling of internal shape changes to external nonholonomic constraints. Employing methods from geometric mechanics, we use the dynamic symmetries and kinematic constraints to develop a specialised form of the dynamic equations which govern undulatory systems. These equations are written in term...
As a common neurotransmitter in the nervous system, γ-aminobutyric acid (GABA) modulates locomotory patterns in both vertebrates and invertebrates. However, the signaling mechanisms underlying the behavioral effects of GABAergic modulation are not completely understood. Here, we demonstrate that a GABAergic signal in C. elegans modulates the amplitude of undulatory head bending through extrasyn...
Introduction: The recognition of low-pressure shock-metamorphic effects in quartz is of increasing importance in studies attempting to verify an impact origin for highly eroded structures [1], recognize sedi-mentary-target impacts characterized by a wide range of shock-pressure regimes, and identify distal impact-ejecta layers or impact-tsunamiites where high-pressure indicators may be rare or ...
This paper studies the mechanics of undulatory locomotion. This type of locomotion is generated by a coupling of internal shape changes to external nonholonomic constraints. Employing methods from geometric mechanics, we use the dynamic symmetries and kinematic constraints to develop a specialised form of the dynamic equations which govern undulatory systems. These equations are written in term...
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