Communication via satellite begins when the satellite is positioned in the desired orbital position. Ground stations can communicate with LEO (Low Earth Orbiting) satellites only when the satellite is in their visibility region. The ground station’s ideal horizon plane is in fact the visibility region under 0 ̊ of elevation angle. Because of natural barriers or too high buildings in urban areas,...

We derive new eeective radii and total magnitudes for 5 E and S0 galaxies in the Leo-I group from wide-eld CCD images. These are used in conjunction with recent literature velocity data to construct the fundamental plane (FP) of the Leo-I group. The rms scatter that we nd is only 6 % in distance. The zero point of this relation provides a calibration of the FP as a distance indicator and direct...

Replicative senescence is thought to relate to aging in vivo and tumor suppression. In this report, we isolated a gene and designated it as RDL (replicative senescence down-regulated Leo1-like gene). RDL's expression decreased upon replicative senescence of human diploid 2BS fibroblasts. Overexpression of RDL slightly delayed 2BS fibroblast senescence, whereas suppression of RDL expression impo...

The present distribution of intact objects is a good proxy to quantify the catastrophic collision risk and consequences in the coming decades. The results of a large number of long term simulations of the LEO environment perturbed by the collisional fragmentation of massive objects are used to identify the main driving parameters of the long term collisional evolution of the debris population a...

Several studies have investigated the antinociceptive, immunomodulatory and anti-inflammatory properties of compounds found in the lavender essential oil (LEO), however to date, there is still lack of substantial data. The objective of this study was to assess the antioxidant, anti-inflammatory and antinociceptive effects of lavender essential oil. The 1,1-diphenyl-2-picrylhydrazyl radical deco...

GPS radio occultation technique has been developed resulting from remote sensing applications in planetary atmospheric limb sounding pioneered by JPL and Stanford University in 1960s. Since the launch of the experimental satellite MicroLab1 on April 3 1995, the primary results from this Low Earth orbiter (LEO) satellite demonstrated potential scienti:c values and practical signi:cance of this i...

Analysis of meiotic tetrads is routinely used to determine genetic linkage in various fungi. Here we apply tetrad analysis to the study of genetic linkage in a vertebrate. The half-tetrad genotypes of gynogenetic diploid zebrafish produced by early-pressure (EP) treatment were used to investigate the linkage relationships of two recessive pigment pattern mutations, leopard (leo) and rose (ros)....

This paper contains a description of a network-based, Learning Environment Organizer entitled LEO, which takes its impetus from the Assimilation Theory of meaningful learning [1]. LEO represents a new approach to computer-mediated augmentation of face-to-face, or hybrid courses, and a different approach to distance learning course delivery. LEO provides the learner with a graphical advance orga...

PURPOSE To better understand the performance of four commercially available neurovascular stents in intracranial aneurysm embolization, the stents were compared in terms of their basic morphological and mechanical properties. MATERIALS AND METHODS Four different types of stents that are currently being used for cerebral aneurysm embolization were prepared (two stents per type). Two were laser...

The functional specialization or redundancy of the ubiquitous 14-3-3 proteins constitutes a fundamental question in their biology and stems from their highly conserved structure and multiplicity of coexpressed isotypes. We address this question in vivo using mutations in the two Drosophila 14-3-3 genes, leonardo (14-3-3zeta) and D14-3-3epsilon. We demonstrate that D14-3-3epsilon is essential fo...