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Search Results: 1 - 10 of 327639 matches for " Aaron S. Richmond "
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The influence of age on reproductive performance of the predatory ladybird beetle, Propylea dissecta
Ahmad Pervez,Omkar,Aaron S. Richmond
Journal of Insect Science , 2004,
Abstract: The influence of age on reproductive performance of an aphidophagous ladybird beetle, Propylea dissecta was examined using male and female beetles of varying ages (1-30 days) after a single mating stimulus. All the intermediate (10 to 20 days old) and old (30 days old) age females mated with all intermediate and old age males, while only a fraction (0.29%) of younger females, 1 to 5 days old, mated with males of similar or older age. The willingness to mate was male age dependent. It increased sigmoidally with increase in adult age. Adult males were more willing to mate with females irrespective of age. Mating duration was longest amongst older adults (30 day-old males and 20 day-old females). Male age did not contribute to shaping the fecundity of the female ladybird. Fecundity was female age dependent and it increased with age up to 20 days and thereafter decreased. 20 day-old females were most fecund producing 867 eggs after a single mating. Progeny production was male age dependent and eggs sired by 20-30 day-old males had significantly higher viability than those sired by younger males. Prolonged mating increased fecundity and egg viability. The results reveal that males of intermediate age were better mates. This information may improve our understanding of the effect of aging on reproduction in ladybirds and may help mass-multiplication of the ladybird beetles using adults of optimal age.
The Two Blogospheres: Political Blog Use, Participation, and Sophistication during the 2008 U.S. Election Season  [PDF]
Aaron S. Veenstra
Open Journal of Political Science (OJPS) , 2014, DOI: 10.4236/ojps.2014.44030
Abstract: Despite the attention given to political blogs in recent campaigns, scholars have often overlooked something without which they could not thrive: readers. Moreover, literature has considered that readers have generally done so without taking account of significant differences between conservative and liberal blogs. This study uses panel data collected during the 2008 U.S. election to examine how conservative, liberal, and non-blog readers differ. Results show little demographic difference between readers and non-readers. However, blog readers consume political media that is aligned with their blog use. Blog readers participate more in politics than non-readers as a result of their blog use, particularly readers of liberal blogs. Finally, blog readers exhibit greater political sophistication than non-readers, and develop greater political interest as a result of blog reading.
The Effect of Urbanization on Ant Abundance and Diversity: A Temporal Examination of Factors Affecting Biodiversity
Grzegorz Buczkowski, Douglas S. Richmond
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041729
Abstract: Numerous studies have examined the effect of urbanization on species richness and most studies implicate urbanization as the major cause of biodiversity loss. However, no study has identified an explicit connection between urbanization and biodiversity loss as the impact of urbanization is typically inferred indirectly by comparing species diversity along urban-rural gradients at a single time point. A different approach is to focus on the temporal rather than the spatial aspect and perform “before and after” studies where species diversity is cataloged over time in the same sites. The current study examined changes in ant abundance and diversity associated with the conversion of natural habitats into urban habitats. Ant abundance and diversity were tracked in forested sites that became urbanized through construction and were examined at 3 time points - before, during, and after construction. On average, 4.3±1.2 unique species were detected in undisturbed plots prior to construction. Ant diversity decreased to 0.7±0.8 species in plots undergoing construction and 1.5±1.1 species in plots 1 year after construction was completed. With regard to species richness, urbanization resulted in the permanent loss of 17 of the 20 species initially present in the study plots. Recovery was slow and only 3 species were present right after construction was completed and 4 species were present 1 year after construction was completed. The second objective examined ant fauna recovery in developed residential lots based on time since construction, neighboring habitat quality, pesticide inputs, and the presence of invasive ants. Ant diversity was positively correlated with factors that promoted ecological recovery and negatively correlated with factors that promoted ecological degradation. Taken together, these results address a critical gap in our knowledge by characterizing the short- and long-term the effects of urbanization on the loss of ant biodiversity.
Intra-arterial thrombolysis in acute ischemic stroke
Aaron S
Neurology India , 2010,
Abstract:
School Variation in Asthma: Compositional or Contextual?
Tracy K. Richmond,S. V. Subramanian
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0008512
Abstract: Childhood asthma prevalence and morbidity have been shown to vary by neighborhood. Less is known about between-school variation in asthma prevalence and whether it exists beyond what one might expect due to students at higher risk of asthma clustering within different schools. Our objective was to determine whether between-school variation in asthma prevalence exists and if so, if it is related to the differential distribution of individual risk factors for and correlates of asthma or to contextual influences of schools.
Phospholipases A1
Gregory S. Richmond,Terry K. Smith
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12010588
Abstract: Phospholipase A 1 (PLA 1) is an enzyme that hydrolyzes phospholipids and produces 2-acyl-lysophospholipids and fatty acids. This lipolytic activity is conserved in a wide range of organisms but is carried out by a diverse set of PLA 1 enzymes. Where their function is known, PLA 1s have been shown to act as digestive enzymes, possess central roles in membrane maintenance and remodeling, or regulate important cellular mechanisms by the production of various lysophospholipid mediators, such as lysophosphatidylserine and lysophosphatidic acid, which in turn have multiple biological functions.
Isolated internuclear ophthalmoplegia as a manifestation of an isolated inflammatory demyelinating lesion of the brainstem
Kumar Sudhir,Aaron S
Neurology India , 2004,
Abstract:
Rising Health Care Costs and Life-Cycle Management in the Pharmaceutical Market
Aaron S. Kesselheim
PLOS Medicine , 2013, DOI: 10.1371/journal.pmed.1001461
Abstract:
Experimental probes of axions
Aaron S. Chou
Physics , 2010,
Abstract: Experimental searches for axions or axion-like particles rely on semiclassical phenomena resulting from the postulated coupling of the axion to two photons. Sensitive probes of the extremely small coupling constant can be made by exploiting familiar, coherent electromagnetic laboratory techniques, including resonant enhancement of transitions using microwave and optical cavities, Bragg scattering, and coherent photon-axion oscillations. The axion beam may either be astrophysical in origin as in the case of dark matter axion searches and solar axion searches, or created in the laboratory from laser interactions with magnetic fields. This note is meant to be a sampling of recent experimental results.
Examining resonant inelastic spontaneous scattering of classical Laguerre-Gauss beams from molecules
Aaron S. Rury
Physics , 2013, DOI: 10.1103/PhysRevA.87.043408
Abstract: This paper theoretically treats the spontaneous resonant inelastic scattering of Laguerre-Gauss (LG) beams from the totally symmetric vibrations of complex polyatomic molecules within the semi-classical framework. We develop an interaction Hamiltonian that accounts for the position of the molecule within the excitation beam to derive the effective differential scattering cross-section of a classical LG beam from a molecule using the frequency domain third order nonlinear optical response function. To gain physical insight into this scattering process, we utilize a model vibronic molecule to study the changes to this scattering process. For specific molecular parameters including vibrational frequency and relative displacement of the involved electronic states, this investigation shows that an incident LG beam asymmetrically enhances one of two participating excitation transitions causing modulation of the interference present in the scattering process. This modulation allows a pathway to coherent control of resonant inelastic scattering from complex, poly-atomic molecules. We discuss the possible application of this control to the resonant x-ray inelastic scattering (RIXS) of small poly-atomic molecules central to applications ranging from single molecule electronics to solar energy science.
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