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Search Results: 1 - 10 of 139682 matches for " K. Morrison "
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On an Appendage of the Male Leucarctia Acraea
H. K. Morrison
Psyche , 1874, DOI: 10.1155/1874/64364
Abstract:
Summer Butterflies at the White Mountains
H. K. Morrison
Psyche , 1874, DOI: 10.1155/1874/26314
Abstract:
List of Lepidoptera Collected at Cliftondale and Wyoming, Mass., May 30, 1874
H. K. Morrison
Psyche , 1874, DOI: 10.1155/1874/18078
Abstract:
On the Insect Fauna of the White Mountains
H. K. Morrison
Psyche , 1875, DOI: 10.1155/1875/43150
Abstract:
Notes on White Mountain Noctuidae
H. K. Morrison
Psyche , 1875, DOI: 10.1155/1875/46468
Abstract:
Varietes of Cleora Pulchraria Minot
H. K. Morrison
Psyche , 1875, DOI: 10.1155/1875/23986
Abstract:
Summer Butterflies at the White Mountains
H. K. Morrison
Psyche , 1875, DOI: 10.1155/1875/84609
Abstract:
Interesting Capture
H. K. Morrison
Psyche , 1874, DOI: 10.1155/1874/48784
Abstract:
Aging, Neuromuscular Decline, and the Change in Physiological and Behavioral Complexity of Upper-Limb Movement Dynamics
S. Morrison,K. M. Newell
Journal of Aging Research , 2012, DOI: 10.1155/2012/891218
Abstract: Aging is characterized by a general decline in physiological and behavioral function that has been widely interpreted within the context of the loss of complexity hypothesis. In this paper, we examine the relation between aging, neuromuscular function and physiological-behavioral complexity in the arm-hand effector system, specifically with reference to physiological tremor and isometric force production. Experimental findings reveal that the adaptive behavioral consequences of the aging-related functional decline in neurophysiological processes are less pronounced in simple motor tasks which provides support for the proposition that the motor output is influenced by both extrinsic (e.g., task related) and intrinsic (e.g., coordination, weakness) factors. Moreover, the aging-related change in complexity can be bidirectional (increase or decrease) according to the influence of task constraints on the adaptation required of the intrinsic properties of the effector system. 1. Introduction A hallmark feature of aging and the onset of disease is a general decline in physiological function and behavioral capacity [1]. This decline can be manifested in different levels and functions of the biological system, including skeletal muscle [2–4], cardiovascular processes [5, 6], central nervous system activity [7–9], and respiratory function [10], leading to detriments in the behavioral capacity of activities of daily living, including increased tremor, loss of balance control, and a decline in walking ability [5, 6, 11–13]. Understanding the potential reason(s) for decline in function is a challenging undertaking, however, as there are numerous variables that can, either singularly or in combination, affect physiological function in the aging adult. For example, factors related to (but not limited to) biological, behavioral, socioeconomic, nutritional, and/or lifestyle/career choices can all impact on the general process of aging and have implications for physiological function [14–16]. The broad range of variables which can negatively affect function in the older adult makes a comprehensive understanding of the direct effect of aging very difficult. In the last decade, the functional deficits in aging have been investigated in the context of changes in the complexity and variability of the output of physiological system(s) [6, 12, 17, 18]. Specifically, the effects of aging are viewed to result in a deficit in physiological function that arises from a progressive “loss of complexity” of the physiological system. This deficit is postulated to arise from a decrease
The role of upstream ULF waves in the generation of quasi-periodic ELF-VLF emissions
K. Morrison,M. P. Freeman
Annales Geophysicae (ANGEO) , 2003,
Abstract: Recent work suggests that the quasi-periodic (QP) modulation ~10–50 s of naturally occurring ELF-VLF radio emissions (~0.5–5 kHz) is produced by the compressional action of Pc3 magnetic pulsations on the source of the emissions. Whilst it is generally accepted that these magnetic pulsations have an exogenic source, it is not clear what the mechanism of their generation is. A study of QP emissions observed during 1988 at Halley, Antarctica, in conjunction with IMP-8 satellite solar wind data, shows that the occurrence and modulation frequency of the emissions are strongly dependent upon the direction and strength of the IMF, respectively. The observed relationships are very similar to those previously reported for Pc3 pulsations associated with upstream ion-cyclotron resonance, involving proton beams reflected at the bowshock. In comparing the observed QP modulation frequencies with upstream wave theory, agreement was found by considering wave excitation exclusively associated with a proton beam reflected from a position on the bowshock at which the shock normal is parallel to the ambient IMF direction. Other geometries were found to be either impropitious or uncertain. The work indicates the useful diagnostic role QP emissions could play in the study of compressional ULF waves in the upstream solar wind and in monitoring the IMF conditions responsible for their generation.
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