Collisional excitation of OH(6049 MHz) masers in supernova remnant - molecular cloud interactions

OH (1720 MHz) masers serve as indicators of SNR - molecular cloud interaction sites. These masers are collisionally excited in warm (50-100K) shocked gas with densities of order 1e5 cm^-3 when the OH column density is in the range 1e16-1e17 cm^-2. Here I present excitation calculations which show that when the OH column density exceeds 1e17 cm^-2 at similar densities and temperatures, the inversion of the 1720 MHz line switches off and instead the 6049 MHz transition in the first excited rotational state of OH becomes inverted. This line may serve as a complementary signal of warm, shocked gas when the OH column density is large.Comment: 2 pages, 2 figs, iaus.cls. To appear in IAU 242, Astrophysical Masers and Their Environments, eds. J. Chapman & W. Baan. Addition of two references and minor changes to wordin

Changes in bone structure and metabolism during simulated weightlessness: Endocrine and dietary factors

The role of vitamin D, PTH and corticosterone in the skeletal alterations induced by simulated weightlessness was examined. The first objective was to determine if changes in the serum concentrations of Ca, P sub i, osteocalcin, 25-OH-D, 24,25(OH)2D or 1,25(OH)2D also occur following acute skeletal unloading. Animals were either suspended or pair fed for 2, 5, 7, 10, 12 and 15 days and the serum concentrations of Ca, P sub i, osteocalcin and the vitamin D metabolites measured. Bone histology was examined at day 5 after suspension. Acute skeletal unloading produced a transient hypercalcemia, a significant fall in serum osteocalcin and serum 1,25(OH)2D, a slight rise in serum 24,25(OH)2D, but did not affect the serum concentrations of P sub i or 25-OH-D. At the nadir in serum 1,25(OH)2D serum osteocalcin was reduced by 22%, osteoblast surface by 32% and longitudinal bone growth by 21%

Dear Mother, I\u27ll Come Home Again

1. Oh! mother dear I sigh in vain, To live my childhood o\u27er again ... And see thy clear, love beaming eye ... Outshine the stars up in the sky, Oh mother dear bright sunny rays, That give such joy and heav\u27nly bliss, As by thy knee I used to pray, Or climb\u27d to steal affection\u27s kiss. CHORUS: Oh mother dear I sigh in vain To live my childhood o\u27er again, And see thy clear love beaming eye, Outshine the stars up in the sky. Oh! mother dear, Oh! my mother dear. 2. Oh! mother dear, those early scenes, The flow\u27ry fields, and meadows green, As thoughts come back I heave a sigh, And wish for happy days gone by; Long since I left my native shore, But now my heart beats just as then, Tho\u27 miles of sea between us roar, Dear mother I\u27ll come again

Rotationally resolved collisional transfer rates in OH

Fluorescence lidar measurements of the hydroxyl radical require detailed information concerning collision induced processes in order to deduce the radical number density from a lidar return. The Goddard SFC OH lidar currently utilizes a broadband detector which precludes the necessity of fully understanding collisional redistribution of rotational energy within the excited state. Numerous advantages result however from the inclusion of a detector with a bandpass only slightly larger that the Doppler width of a rotational line. This however places more stringent requirements on the spectroscopy. Measurements were accordingly made of rotationally resolved quenching rates for collisions with O2, N2, and H2O. Rotational transfer rates were also measured for the same colliders. Quenching rates were measured using a Nd-YAG pumped Rh6G dye laser doubled into the UV. The OH lifetimes were measured as a function of pressure of quenching gas at total pressures of between 50 and 250 microns. Rotational transfer rates were measured by recording the emission spectrum on an intensified diode array and integrating over 10.000 laser shots

Volume 51, Number 2

Volume 51, Number 2. 6 pages including covers and advertisements. Miller, Sam The American Inferno Magner, Tom Canonized McNiel, Paul Nightshade\u27s Obbligato Rybarski, Michael McNeil, Paul Stew Ellis, J. Patrick Egan, Gerard Today Is Rain McNeil, Neil C. hope & consolation 1971 McNeil, Paul Outer Flight O\u27Neil, Charles J. Jr. Freedom O\u27Neil, Charles J. Jr. More or Less O\u27Neil, Charles J. Jr. As a Seed O\u27Neil, Charles J. Jr. Confectioner O\u27Neil, Charles J. Jr. For Existential Mariners Egan, Gerard Thursday Night Bortolot, Gary Balder Osborne, J.C. The Death of the American Achilles Bortolot, Gary Childhood\u27s Dream Piergrossi, Joe Egan, Gerard Rover, Dominic, O.P. THREE POEMS Ellis, J. Patrick Peter and The Aberration Ellis, J. Patrick Media #7 Nadeau, Larry A GOOD PASTIME Ellis, J. Patrick Secondary Reader VOL. 5 Egan, Gerard Downtown Yet Not Spring Piergrossi, Joe I Knew A Little Midget Man Egan, Gerard Rhys, Skyles Red Worm Kilgallen, Michael Quarter Hour Valentine McNeil, Paul 1969 Political O\u27Neil, Charles J. Jr. To Go Piergrossi, Jo

J Occup Environ Med

T42 OH008421/OH/NIOSH CDC HHS/United States2017-08-01T00:00:00Z27501002PMC497813

Radiative transfer in planetary atmospheres

Rheoretical techniques and observations at millimeter wavelengths are combined to study the atmosphere of planets and comets, planetary and satellite regoliths, and planetary rings. Analysis of the very high quality data on the 18 cm OH line observed in recent comets continued. The high spectral resolution and high signal-to-noise make these lines ideal for study of the kinematics in cometary comae. A model of the collisional quenching of the inversion of the lambda doublet responsible for the OH radio emission has been developed by P. Schloerb. For conditions appropriate to Halley's Comet, collisional quenching should lead radio observers to systematically underestimate the OH parent production rate by a factor of approximately 3 relative to its actual value, which is very consistent with differences observed between radio and ultraviolet-derived production rates. Modeling is likewise continuing for the profiles observed in the lowest rotational transition of HCN in Comet Halley in order to better estimate the excitation and hence the abundance of HCN, as well as the kinematics of parent molecules in the coma. A collaborative program to combine data from the 14 m antenna with interferometric data abtained at the Hat Creek Radio Observatory is allowing aperture synthesis mapping of Venus in the CO J=1-0 line

J Cult Divers

This study explored culturally related health practices among Hispanic migrant seasonal farmworkers. In this cross-sectional qualitative study, six Hispanic migrant seasonal farmworkers from southeastern Michigan farms were interviewed. Four major themes emerged from the study. Financial and employment limitations, rather than folk health care practices, were more likely to influence use of professional care systems. There was limited use of folk healers and culturally-related practices, primarily due to lack of access. Results may be used to identify needs and develop culturally appropriate programs and services to improve the health of Hispanic migrant seasonal farmworkers.T42 OH008455/OH/NIOSH CDC HHS/United StatesT42OH008455/OH/NIOSH CDC HHS/United States2016-03-04T00:00:00Z26245012PMC477855

Int J Radiat Biol

R01 CA221150/CA/NCI NIH HHS/United StatesR01 OH010469/OH/NIOSH CDC HHS/United States2019-01-01T00:00:00Z29219654PMC6218938vault:3108