We have searched for redshifted absorption in the 21 cm line of neutral hydrogen toward 'red quasars', which are extragalactic radio sources with a steep spectral drop between optical and infrared wavelengths. The success rate for detecting HI 21cm absorption toward a representative sample of such sources is 80%. This compares to the much lower success rate of 11% for detecting HI 21cm absorpti...

BACKGROUND Cow hair and dander are important inducers of occupational allergies in cattle-exposed farmers. To estimate allergen exposure in farming environments, a sensitive enzyme immunoassay was developed to measure cow hair allergens. METHODS A sandwich ELISA was developed using polyclonal rabbitantibodies against a mixture of hair extracts from different cattle breeds. To assess the speci...

A follow-up study of lung function tests and dust measurements was undertaken in ginnery workers employed in five ginning factories. Respiratory symptoms and respiratory function tests (FEV1 and FVC) were first recorded in 1967 on a total of 382 workers (323 permanently employed ginnery workers, 35 seasonal farfara workers, and 24 fire brigade men as controls). In 1969 after a six-month break f...

The maps presented in Paper I are here used to infer the variation of the column densities of HCO, DCO, N2H, and N2D as a function of distance from the dust peak. These results are interpreted with the aid of a crude chemical model which predicts the abundances of these species as a function of radius in a spherically symmetric model with radial density distribution inferred from the observatio...

for determination of so2 concentration and its variation due to time and location within tehran air-shed area, department of environmental health, school of public health installed two units of semiautomatic air sampler, in tehran university campus and ghazvin-square area. collected samples were analyzed according to hydrogen peroxide method and for each month arithmetic mean was calculated. th...

Introduction: Reddish, relatively bright air fall dust is widespread across the Spirit landing site within Gusev Crater. The transience of dust devil tracks observed in the multi-year record of MOC images indicates dusty air fall continually obscures somewhat darker materials across the site. A few enduring dark-toned areas within the Columbia Hills are exceptional. MOC images show these darker...