SUMMARY— The effects of temperature and humidity on postmortem and associated muscle properties during growth of “stress susceptible” pigs were evaluated. Exposure to ambient temperatures of 32 and 21°C for alternating 3‐day periods caused rapid post‐mortem glycolysis, high percent light reflectance, and increased light to dark fiber ratios in the longissimus dorsi muscle as compared to constant (27°C) temperature, but only in moderate (38–42% relative) humidity environments. The above events due to temperature acclimation were masked when the humidity was low (17–23% relative). Humidity effects that were independent of temperature acclimation resulted in high percent light reflectance and high muscle temperature in the post‐mortem muscle of pigs reared in low humidity. No significant differences were found in lactic dehydrogenase or succinic dehydrogenase enzyme activities of longissimus dorsi or gluteus medius muscles.
Nitrogen balance and urea excretion were measured in a group of 4- to 6-year-old children receiving a rice and bean diet providing 1 g of protein per kilogram of body weight per day and three levels of calories. With diets providing 2300 and 3000 kcal/day, nitrogen retention was 41.16 +/- 29.04 and 53.30 +/- 18.46 mg/kg of body weight per day, respectively. With 1400 kcal/day, diet nitrogen retention decreased to 25.38 +/- 13.88 mg/kg body weight and urea nitrogen excretion increased. The importance of adequate caloric intake for optimum utilization of dietary protein from a rice and bean diet for growing children is demonstrated.
Analyses were made to determine the amino acid composition of the cell-wall proteins of Salmonella pullorum, S. senftenberg 775W, S. derby, and Escherichia coli. These proteiins consist of the usual 18 amino acids found in most proteins with diaminopimelic acid in addition. Quantitative determination of these amino acids showed that their amounts were similar.
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