Effect of varying ratios of fat and protein in fiber-free semisynthetic diets on fecal output of pig-tailed monkeys (Macaca nemestrina).

The effect of varying the ratios of dietary fat, protein and carbohydrate on the amount and composition of fecal output was studied in adult, male pig-tailed monkeys (Macaca nemestrina) fed liquid, fiber-free semisynthetic diets. The dietary nitrogen was supplied as an enzymatic protein hydrolyzate (biological value = 86%), the fat as corn oil, and the carbohydrate as corn syrup solids. Vitamins and minerals were added to meet the nutritional requirements of this monkey. Nine diets were fed for 2 weeks, and fecal excreta collected daily after 4-day adaptation to a new diet. The levels of protein/day were 40, 80, and 160 kcal/animal and the levels of fat/day were 4.5, 22.5, and 112.5 kcal/animal. Carbohydrates were adjusted to maintain the diets isocaloric (700 kcal/day per monkey). The assumption was made that a) there was no time trend, and b) that the preceding diet had no carry-over effect on the next diet being tested. Results suggest that total fecal output was greater on the high protein diets, especially when fat levels were either 4.5 or 112.5 kcal. The 22.5 kcal fat and 160 kcal protein did not show an increase in fecal output. These fecal output differences were related to changes in fecal moisture but not in dry fecal matter. Increased nitrogen loss in the feces was noted for all 160 kcal protein diets, and especially so when the fat level was 4.5 kcal. The 112.5 kcal fat diet produced feces higher in total lipids. If a fiber-free formula diet is designed to induce a minimum of fecal bulk, the most satisfactory formulation appears to be one with a moderate amount of dietary fat, and a protein content in the general range of the recommended daily allowance.

Women's emotions and concerns during pregnancy following perinatal loss.

PURPOSE: To determine the specific emotions and concerns of women who are pregnant following a perinatal loss. STUDY DESIGN AND METHODS: Data were collected through a mailed questionnaire using an open response format. The sample consisted of 73 women on the membership mailing lists from two pregnancy-after-loss support groups. A content analysis was conducted on women's self-reports; five primary emotions and five main concerns were expressed during their pregnancies. RESULTS: "Anxious," "nervous," and "scared" were the most frequent emotions reported by these women. However, most women also included a positive emotion in their list, indicating the mixed emotions of their pregnancy experience. Eight categories of profound concerns were identified: "losing another baby," "overall health of the baby," "emotional stability of self," "impact of another loss on my future," "lack of support from others," "fear of bad news," "own impact on the baby," and "worries never end." Responses of currently pregnant women as compared with women retrospectively reporting on their last pregnancy experiences were essentially similar. CLINICAL IMPLICATIONS: Women pregnant after a previous perinatal loss are skeptical about pregnancy. Clinicians should be cognizant of the constellation of concerns and the simultaneous contrasting emotions experienced by these women in order to provide supportive prenatal care. Because the women's concerns are ongoing, responsive care should include asking about specific concerns throughout the pregnancy.

Properties of the enterotoxic component in Escherichia coli enteropathogenic for swine.

The enterotoxic component in sterile syncase broth filtrates of Escherichia coli strains 340 (O9:K.:NM) and P307 (O8:K87,88a,b:H19) was studied. The enterotoxic activity in both strains was retained by an ultrafiltration membrane with a molecular weight retention of 100,000 (XM-100A) and eluted from a Sephadex G-200 column in the void volume. The enterotoxic activity in strain 340 was resistant to heating at 75 C for 30 min, but the activity in strain P307 was destroyed by heating at 60 C for 30 min. The P307 Sephadex G-200 column eluate possessing the enterotoxic activity, when desalted, contained 45.8% carbohydrate and 9.3% protein, and had an ED(50) of 2.2 mg/rabbit ileal loop. Immunodiffusion studies showed that this material contained both endotoxin and acid-polysaccharide capsular material. The enterotoxic activity was acidlabile and was destroyed by Pronase, but was resistant to trypsin and eluted as a single peak in the void volume of a 4% agarose column. The enterotoxic component could not be separated from the endotoxin; in fact, the data indicated that the two components are closely associated and that the enterotoxic activity resides in material of a protein nature.