On 1996 March 14È15 we conducted a campaign with the Hubble Space Telescope GHRS to observe the Si IV jj1394, 1403 lines of the B0.5e star c Cas at high temporal and spectral resolution. As a part of this D22 hr campaign, the Rossi X-Ray T iming Explorer (RXT E) was also used to monitor this starÏs copious and variable X-ray emission. In this fourth paper of a series we present an analysis of t...

We present high dispersion HST GHRS UV spectroscopic observations of 8 H II galaxies covering a wide range of metallicities and physical properties. We have found Lyα emission in 4 galaxies with blueshifted absorption features, leading to P Cygni like profiles in 3 of them. In all these objects the O I and Si II absorption lines are also blueshifted with respect to the ionized gas, indicating t...

The rich structure of the AΠ−XΣ system of carbon monoxide accounts for many of the spectral features seen in long slit HST -STIS observations of comets 153P/Ikeya-Zhang, C/2001 Q4 (NEAT), and C/2000 WM1 (LINEAR), as well as in the HST -GHRS spectrum of comet C/1996 B2 (Hyakutake). A detailed CO fluorescence model is developed to derive the CO abundances in these comets by simultaneously fitting...

The presence of growth hormone (GH) and GH receptors (GHRs) in the lung suggests it is an autocrine/paracrine target site for pulmonary GH action and/or an endocrine site of pituitary GH action. Roles for GH in lung growth or pulmonary function are, however, uncertain. The possibility that pituitary and/or pulmonary GH have physiological roles in lung development has therefore been investigated...

I present a GHRS archival study of the interstellar absorption lines in the line-of-sight to the H i-rich starburst dwarf galaxy NGC 1705, in the λ1170 to 1740 Å range at ∼ 120 km s resolution. The absorption features arising due to photospheric lines are distinctly different from the interstellar lines : the photospheric lines are weak, broad (equivalent widths > 1Å), asymmetric and centred ar...

Archival Goddard High Resolution Spectrograph low-resolution spectra of and a velocity resolution ∼ 100 km s −1 , have been used to derive the velocity structure and equivalent widths of the absorption lines of Si ii λ1190.42, λ1608.45Å in this sightline. Three relatively narrow absorption components are seen at LSR velocities –20 km s −1 , 260 km s −1 and 540 km s −1. Arguments are presented t...

Growth hormone (GH) signaling requires activation of the GH receptor (GHR)-associated tyrosine kinase, JAK2. JAK2 activation by GH is believed to facilitate initiation of various pathways including the Ras, mitogen-activated protein kinase, STAT, insulin receptor substrate (IRS), and phosphatidylinositol 3-kinase systems. In the present study, we explore the biochemical and functional involveme...

G RECEPTOR (GHR) is a transmembrane protein that binds GH with high affinity and specificity. Expression of the receptor is a requirement for cellular responsiveness to GH. The primary transcript that generates the GHR mRNA can undergo alternative processing to produce several related mRNAs, including transcripts that encode the circulating GH-binding protein (GHBP) and a truncated GHR that inh...

The ambient interstellar plasma density (i.e. the plasma density of the interstellar medium surrounding the Sun) directly governs the structure and the size of our heliosphere. Information on this density can be derived from the ionization states of the interstellar species which can be detected in absorption along the paths to the nearby stars, and which can be shown to belong to the Local Int...

We have made the first interferomeric measurements of the wavelengths of the important ultraviolet diagnostic lines in the spectra C IV near 155nm and Si IV near 139nm with a vacuum ultraviolet Fourier transform spectrometer and high-current discharge sources. The wavelength uncertainties were reduced by one order of magnitude for the C IV lines and by two orders of magnitude for the Si IV line...