scholarly journals Two experimental designs generate contrasting patterns of behavioral differentiation along a latitudinal gradient in Lestes sponsa —Common‐garden not so common after all?

2020 ◽  
Vol 10 (18) ◽  
pp. 10242-10253 ◽  
Author(s):  
Maria J. Golab ◽  
Tomas Brodin ◽  
Szymon Sniegula
Keyword(s):  
Latitudinal Gradient ◽  
Common Garden ◽  
Experimental Designs ◽  
Behavioral Differentiation ◽  
Lestes Sponsa

Common‐garden experiment reveals clinal trends of bud phenology in black spruce populations from a latitudinal gradient in the boreal forest

2021 ◽  
Author(s):  
Xiali Guo ◽  
Marcin Klisz ◽  
Radosław Puchałka ◽  
Roberto Silvestro ◽  
Patrick Faubert ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Latitudinal Gradient ◽  
Black Spruce ◽  
Common Garden ◽  
Common Garden Experiment ◽  
Bud Phenology

scholarly journals Metabolic adaptations in a range expanding arthropod

2016 ◽  
Author(s):  
Katrien H. P. Van Petegem ◽  
David Renault ◽  
Robby Stoks ◽  
Dries Bonte
Keyword(s):  
Amino Acids ◽  
Range Expansion ◽  
Latitudinal Gradient ◽  
Life History Evolution ◽  
Common Garden ◽  
Essential Amino Acids ◽  
Gas Chromatography Mass Spectrometry ◽  
Genetic Changes ◽  
Two Spotted Spider Mite ◽  
Range Core

SummaryDespite an increasing number of studies documenting life-history evolution during range expansions or shifts, we lack a mechanistic understanding of the underlying physiological processes. In this explorative study, we used a metabolomics approach to study physiological changes associated with the recent range expansion of the two-spotted spider mite (Tetranychus urticae). Mite populations were sampled along a latitudinal gradient from range core to edge and reared under benign common garden conditions for two generations. Using Gas Chromatography-Mass Spectrometry (GC-MS), we obtained metabolic population profiles, which showed a gradual differentiation along the latitudinal gradient, indicating (epi)genetic changes in the metabolome in association with range expansion. These changes seemed not related with shifts in the mites’ energetic metabolism, but rather with differential use of amino acids. Particularly, more dispersive northern populations showed lowered concentrations of several essential and non-essential amino acids, suggesting a potential downregulation of metabolic pathways associated with protein synthesis.

Effect of Computerized Auditory Training on Speech Perception of Adults With Hearing Impairment

2013 ◽  
Vol 20 (3) ◽  
pp. 91-106 ◽  
Author(s):  
Rachel Pizarek ◽  
Valeriy Shafiro ◽  
Patricia McCarthy
Keyword(s):  
Hearing Loss ◽  
Speech Perception ◽  
Literature Review ◽  
Low Cost ◽  
Experimental Designs ◽  
Auditory Training ◽  
Hearing Impairments ◽  
Communicative Disorders ◽  
And Training

Computerized auditory training (CAT) is a convenient, low-cost approach to improving communication of individuals with hearing loss or other communicative disorders. A number of CAT programs are being marketed to patients and audiologists. The present literature review is an examination of evidence for the effectiveness of CAT in improving speech perception in adults with hearing impairments. Six current CAT programs, used in 9 published studies, were reviewed. In all 9 studies, some benefit of CAT for speech perception was demonstrated. Although these results are encouraging, the overall quality of available evidence remains low, and many programs currently on the market have not yet been evaluated. Thus, caution is needed when selecting CAT programs for specific patients. It is hoped that future researchers will (a) examine a greater number of CAT programs using more rigorous experimental designs, (b) determine which program features and training regimens are most effective, and (c) indicate which patients may benefit from CAT the most.

Quasi-Experimental Designs Evaluation of a Preoffer Risk Management Assessment Program

2012 ◽  
Author(s):  
Jason Read ◽  
Seth Zimmer ◽  
Kelly D. Dages ◽  
John W. Jones
Keyword(s):  
Risk Management ◽  
Experimental Designs ◽  
Assessment Program ◽  
Quasi Experimental

Radionuclide hybrid imaging in common garden slugs (Arionidae)

2020 ◽  
Author(s):  
N Beindorff ◽  
D Messroghli ◽  
JF Eary ◽  
W Brenner
Keyword(s):  
Hybrid Imaging ◽  
Common Garden

Water Tunnel to test and characterization of experimental designs of Hydrokinetics Turbines

2018 ◽  
Vol 1 (6) ◽  
Author(s):  
Eduardo Alvarez-Alvarez ◽  
Aitor Fernandez-Jimenez ◽  
Manuel Rico-Secades ◽  
Antonio Javier Calleja-Rodriguez ◽  
Joaquin Fernandez-Francos ◽  
...  
Keyword(s):  
Experimental Designs ◽  
Water Tunnel

Revisiting Glycerol Esterification with Acetic Acid over Amberlyst-35 via Statistically Designed Experiments: Overcoming Transport Limitations

2019 ◽  
Author(s):  
Víctor Gabriel Baldovino Medrano ◽  
Karen V. Caballero ◽  
Hernando Guerrero-Amaya
Keyword(s):  
Acetic Acid ◽  
Active Sites ◽  
Batch Reactor ◽  
Catalyst Particle ◽  
Experimental Designs ◽  
Particle Sizes ◽  
Turnover Rates ◽  
Designed Experiments ◽  
Different Temperatures ◽  
Glycerol Esterification

Turnover rates for glycerol esterification with acetic acid over Amberlyst-35 were measured under different temperatures, reactants and active sites concentrations, and catalyst particle sizes. Data were collected in a batch reactor. Experiments were done following a sequence of factorial experimental designs.

COMPARISON OF DIFFERENT EXPERIMENTAL DESIGNS, SAMPLE SIZES AND TECHNIQUES APPLIED TO METAMODELING THE INDUCED DRAG COEFFICIENT OF A BOX-WING AIRCRAFT

2018 ◽  
Author(s):  
Luiz Fernando Tibério Fernandez ◽  
Guilherme Barufaldi ◽  
Adson De Paula ◽  
Luiz Carlos Sandoval
Keyword(s):  
Drag Coefficient ◽  
Experimental Designs ◽  
Sample Sizes ◽  
Induced Drag

Q-optimal experimental designs and close to them experimental designs for polynomial regression on the interval

2020 ◽  
Vol 86 (5) ◽  
pp. 65-72
Author(s):  
Yu. D. Grigoriev
Keyword(s):  
Optimal Design ◽  
Polynomial Regression ◽  
Direct Consequence ◽  
Experimental Designs ◽  
Optimal Designs ◽  
Software Systems ◽  
General Character ◽  
Support Points ◽  
Optimal Weights ◽  
Universal Expression

The problem of constructing Q-optimal experimental designs for polynomial regression on the interval [–1, 1] is considered. It is shown that well-known Malyutov – Fedorov designs using D-optimal designs (so-called Legendre spectrum) are other than Q-optimal designs. This statement is a direct consequence of Shabados remark which disproved the Erdős hypothesis that the spectrum (support points) of saturated D-optimal designs for polynomial regression on a segment appeared to be support points of saturated Q-optimal designs. We present a saturated exact Q-optimal design for polynomial regression with s = 3 which proves the Shabados notion and then extend this statement to approximate designs. It is shown that when s = 3, 4 the Malyutov – Fedorov theorem on approximate Q-optimal design is also incorrect, though it still stands for s = 1, 2. The Malyutov – Fedorov designs with Legendre spectrum are considered from the standpoint of their proximity to Q-optimal designs. Case studies revealed that they are close enough for small degrees s of polynomial regression. A universal expression for Q-optimal distribution of the weights pi for support points xi for an arbitrary spectrum is derived. The expression is used to tabulate the distribution of weights for Malyutov – Fedorov designs at s = 3, ..., 6. The general character of the obtained expression is noted for Q-optimal weights with A-optimal weight distribution (Pukelsheim distribution) for the same problem statement. In conclusion a brief recommendation on the numerical construction of Q-optimal designs is given. It is noted that in this case in addition to conventional numerical methods some software systems of symbolic computations using methods of resultants and elimination theory can be successfully applied. The examples of Q-optimal designs considered in the paper are constructed using precisely these methods.

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