Now showing items 1-10 of 4773
Multilocus test for nuclear introgression between Macaca mulatta and M fascicularis: Evidence for gene flow in macaques
Introgression due to hybridization is important for our understanding of species divergence. In this study, we analyze potential introgression between Macaca mulatta and M fascicularis using DNA sequences from 19 genes. While the putative introgression between these species has been studied previously, it has not been analyzed using nuclear loci from ...
Tomographic study of mantle structure beneath eastern Asia
A high-resolution 3D P-wave velocity model of the mantle beneath eastern Asia was obtained through performing seismic travel-time tomography by using recently emerging new datasets. An improved relocation method that accounts for correlated travel-time errors among similar ray paths was applied to reduce location bias caused by unmodeled heterogeneities. ...
Purification of small bandgap fullerenes
A process for purification of the previously insoluble empty fullerenes and endohedral metallofullerenes was developed, based on sublimation from the soot and subsequent solubilization by electrochemical reduction. The newly purified fullerenes were shown to have small gaps between filled and unfilled electronic states. They are expected to be ...
Absolute differential and integral cross sections for charge transfer of state-selected keV oxygen ion with oxygen(2)
Absolute differential and integral charge transfer cross sections have been measured for 0.5, 0.85, 1.5, 2.8, and 5.0 keV O$\sp+$ with O$\sb2$ at scattering angles between 0.01$\sp\circ$ and 3.50$\sp\circ$ in the laboratory frame. The dependence of these cross sections upon the electronic state of the O$\sp+$ ion was investigated. This study was ...
Carbon-Based Nanostructures as Advanced Contrast Agents for Magnetic Resonance Imaging
Superparamagnetic carbon-based nanostructures are presented as contrast agents (CAs) for advanced imaging applications such as cellular and molecular imaging using magnetic resonance imaging (MRI). Gadolinium-loaded, ultra-short single-walled carbon nanotubes (gadonanotubes; GNTs) are shown to have extremely high rl relaxivities (contrast enhancement ...
Self-Inverses in Rauzy Classes
Thanks to works by M. Kontsevich and A. Zorich followed by C. Boissy, we have a classification of all Rauzy Classes of any given genus. It follows from these works that Rauzy Classes are closed under the operation of inverting the permutation. In this paper, we shall prove the existence of self-inverse permutations in every Rauzy Class by giving an ...
The Evolutionary Ecology of Stereoisomeric Sesquiterpene Lactones in Xanthium strumarium
The ecological factors that maintain defensive chemical variation within and between plant species have intrigued ecologists for decades. While theory posits that polymorphisms may be maintained different forms of balancing selection, relatively few expe
Decreased transmitter release conferred by a mutation in the slowpoke-encoded calcium-dependent potassium channel gene at the Drosophila neuromuscular junction
Using immunocytochemical and electrophysiological methods, the effects of mutations in the structural gene for a calcium activated potassium channel, slowpoke (slo), in Drosophila melanogaster were studied. Anti-horseradish peroxidase was used to visualize the branching of the nerves innervating the body wall muscles. No differences are observed ...
The role of calcium in light adaptation of the crayfish photoreceptor
As previously shown in many other photoreceptors, during prolonged exposure to light, receptor sensitivity (mv/photon catch) declines and the speed of the response (rate of depolarization and rate of repolarization) increases. The functional significance of internal and external calcium in these changes were examined in the crayfish. We show that the ...
Functionalized single-walled carbon nanotubes for composite applications and radiation studies
This dissertation offers a hopeful advance towards our future in space. Materials for space applications need to be strong, lightweight, and be multifunctional. Single-walled carbon nanotubes (SWNTs) have various properties that fit these criteria as a novel material for space and biomedical applications. To utilize SWNTs for this purpose, new chemical ...