The role of vegetative spread and seed dispersal for optimal life histories of clonal plants: a simulation study

2002 ◽  
pp. 59-79
Author(s):  
E. Winkler ◽  
M. Fischer
Keyword(s):  
Seed Dispersal ◽  
Simulation Study ◽  
Life Histories ◽  
Clonal Plants ◽  
Vegetative Spread ◽  
Optimal Life Histories

Hormones and Behavior

2019 ◽  
pp. 11-26
Author(s):  
Maren N. Vitousek ◽  
Laura A. Schoenle
Keyword(s):  
Life History ◽  
Life Histories ◽  
Life History Traits ◽  
Developmental Plasticity ◽  
Endocrine System ◽  
Phenotypic Traits ◽  
Social Environments ◽  
Trade Offs ◽  
And Behavior

Hormones mediate the expression of life history traits—phenotypic traits that contribute to lifetime fitness (i.e., reproductive timing, growth rate, number and size of offspring). The endocrine system shapes phenotype by organizing tissues during developmental periods and by activating changes in behavior, physiology, and morphology in response to varying physical and social environments. Because hormones can simultaneously regulate many traits (hormonal pleiotropy), they are important mediators of life history trade-offs among growth, reproduction, and survival. This chapter reviews the role of hormones in shaping life histories with an emphasis on developmental plasticity and reversible flexibility in endocrine and life history traits. It also discusses the advantages of studying hormone–behavior interactions from an evolutionary perspective. Recent research in evolutionary endocrinology has provided insight into the heritability of endocrine traits, how selection on hormone systems may influence the evolution of life histories, and the role of hormonal pleiotropy in driving or constraining evolution.

scholarly journals Simulation Study of the Structure and Phase Behavior of Ceramide Bilayers and the Role of Lipid Headgroup Chemistry

2013 ◽  
Vol 9 (11) ◽  
pp. 5116-5126 ◽  
Author(s):  
Shan Guo ◽  
Timothy C. Moore ◽  
Christopher R. Iacovella ◽  
L. Anderson Strickland ◽  
Clare McCabe
Keyword(s):  
Phase Behavior ◽  
Simulation Study

scholarly journals Role of effective atomic masses in memory function-based models for liquids: A simulation study of liquid water

2006 ◽  
Vol 125 (23) ◽  
pp. 236102 ◽  
Author(s):  
Vania Calandrini ◽  
Godehard Sutmann ◽  
Antonio Deriu ◽  
Gerald R. Kneller
Keyword(s):  
Simulation Study ◽  
Liquid Water ◽  
Memory Function ◽  
Atomic Masses

Role of Dominant Hand Position during Chest Compression by Novice Rescuers: An Observational Simulation Study

2014 ◽  
Vol 21 (6) ◽  
pp. 382-386 ◽  
Author(s):  
Ch Jo ◽  
Jh Ahn ◽  
Yd Shon ◽  
Gc Cho
Keyword(s):  
Hong Kong ◽  
Cardiopulmonary Resuscitation ◽  
Training Program ◽  
Chest Compression ◽  
Simulation Study ◽  
Hand Position ◽  
Dominant Hand ◽  
Cpr Training

Introduction The aim of this study was to determine the effect of hand positioning on the quality of external chest compression (ECC) by novice rescuers. Methods This observational simulation study was conducted for 117 included participants. After completion of an adult cardiopulmonary resuscitation (CPR) training program for 3-h, the participants selected which of their hands would be in contact with the mannequin during ECC and performed 5 cycles of single rescuer CPR on a recording mannequin. The participants were assigned to 2 groups: the dominant hand group (DH; n=40) and the non-dominant hand group (NH; n=29). The depth and rate of ECC were analysed to compare the effectiveness of ECC between 2 groups. Results The rate of ECC was significantly faster in the DH group (mean, 117.3 ±11.4/min) than in the NH group (mean, 110.9±12.2/min) (p=0.028). However, the depth of ECC in the dominant hand group (mean, 52.4±5.9 mm) was not significantly different from that in the non-dominant hand group (mean, 50.8±6.0 mm) (p=0.287). Similarly, the portion of ECC with inadequate depth in the dominant hand group (mean, 1.8±4.3%) was not significantly different from that in the non-dominant hand group (mean, 5.3±15.6%) (p=0.252). Conclusions ECC can be performed with an acceptably higher rate of compressions when the dominant hand of the novice rescuer is placed in contact with the sternum. However, the position of the dominant hand does not affect the depth of ECC. (Hong Kong j.emerg.med. 2014;21:382-386)

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