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Biomedical subjects

J H Mann

Publications and source records attributed to J H Mann.

5 recordsLinked to original sources
PubMed1990

An industrial hygiene evaluation of beet sugar processing plants.

Industrial hygiene surveys were conducted at seven beet sugar processing plants to evaluate worker exposures to chemical contaminants used or generated in the process. Personal air sampling used to evaluate worker exposures showed overexposures to calcium oxide, carbon monoxide, respirable coal dust, sulfur dioxide, and sugar dust. The beet sugar industry is an old industry, lacking engineering controls found in many other industries.

Air Pollutants, Occupational↗
PubMed1986

A solid sorbent for crotonaldehyde in air.

The purpose of this study was to determine whether molecular sieves could be used as a solid sorbent for sampling crotonaldehyde vapors. A simple dynamic dilution apparatus generated concentrations of crotonaldehyde vapors which were sampled with molecular sieve sampling tubes and a constant flow sampler. Laboratory sampling demonstrated quantitative trapping and recovery, and stability of stored samples. Although crotonaldehyde break-through times are decreased by water vapor, it has been demonstrated that sub-ppm levels of volatile aldehydes can be determined under field conditions of high humidity. Further work is needed to quantify the maximum allowable sample volume for crotonaldehyde under such field conditions.

Air Pollutants, Occupational↗
PubMed1982

CT of abdominal tuberculosis.

Intraabdominal tuberculosis (TB) presents with a wide variety of clinical and radiologic features. Besides the reported computed tomographic (CT) finding of high-density ascites in tuberculous peritonitis, this report describes additional CT features highly suggestive of abdominal tuberculosis in eight cases: (1)irregular soft-tissue densities in the omental area; (2) low-density masses surrounded by thick solid rims; (3) a disorganized appearance of soft-tissue densities, fluid, and bowel loops forming a disorganized appearance of soft-tissue densities, fluid, and bowel loops forming a poorly defined mass; (4) low-density lymph nodes with a multilocular appearance after intravenous contrast administration; and (5) possibly high-density ascites. The differential diagnosis of these features include lymphoma, various forms of peritonitis, peritoneal carcinomatosis, and peritoneal mesothelioma. It is important that the CT features of intraabdominal tuberculosis be recognized in order that laparotomy be avoided and less invasive procedures (e.g., laparoscopy, biopsy, or a trail of antituberculous therapy) be instituted.

Adolescent↗