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Biomedical subjects

M S Hill

Publications and source records attributed to M S Hill.

11 recordsLinked to original sources

Identification of the Xenopus laevis cDNA for EXT1: a phylogenetic perspective.

The EXT family of genes is involved in the developmentally important biosynthesis of heparan sulfate molecules. Members of the EXT family have a demonstrated role in gastrulation, wing formation in flies, and proper bone development in vertebrates. EXT family members have been isolated from several phylogenetically diverse species. We report here, the isolation of the first Xenopus laevis EXT1 family member and discuss the evolutionary origins of this gene family.

Amino Acid Sequence↗

Minority recruitment in the prostate cancer prevention trial.

PURPOSE: African American men have a higher prostate cancer risk profile than that of other men in the United States. The purpose of this manuscript is to summarize the challenges associated with enrolling and randomizing African American and other minority participants in the Prostate Cancer Prevention Trial (PCPT). METHODS: The PCPT is a randomized trial of finasteride versus placebo for preventing prostate cancer in healthy men age 55 years and older; it is coordinated by the Southwest Oncology Group. The manuscript describes demographic and lifestyle characteristics of the PCPT randomized sample (18,882 men) by four racial and ethnic groups (Caucasian, African American, Hispanic, and other). African American men comprised 4% of the total randomized sample compared to our goal of 8%. Minority recruitment was emphasized through the Study Manual and training that occurred at trial activation. Supplemental minority recruitment activities were initiated a year after study activation and continued through the end of the accrual period. Minority recruitment was emphasized as follows: minority recruitment presentations at PCPT training seminars (held during twice yearly Southwest Oncology Group meetings); distribution of additional minority recruitment materials; engagement of four consultants for minority recruitment; production of a Minority Recruitment Manual; and a small pilot study involving minority outreach recruiters at five PCPT sites. RESULTS: The consultants were helpful in implementing the pilot project and in suggesting and reviewing materials for minority recruitment. The five-site pilot project did not increase either enrollment or randomization of minorities (with a possible exception at one site). CONCLUSIONS: We suggest that a long-term perspective is required for successful recruitment of minority participants in clinical trials. Likewise, extensive minority recruitment efforts must be ready to implement at trial activation.

Aged↗

Selection of children to provide care: the effect of earlier parental transfers.

We use the first wave of data from the Asset and Health Dynamics Among the Oldest Old (AHEAD) study to examine the effects of past parent-to-child financial transfers on selection of a child to provide assistance with basic personal care for unmarried parents. We estimate a fixed-effects conditional logit model and find a positive and significant association between past financial transfers and a child's current helping behavior. The coefficient of past financial transfers is in the direction hypothesized, and its magnitude is 80% as large as that of gender, a well-documented powerful predictor of parental caregiving. There appears to be substantial evidence that earlier parent-to-child financial gifts play a role in determining which child in the family will provide assistance.

Aged↗

Welfare dependence within and across generations.

A central question in the debate about the effects of welfare programs is whether their intended positive results--providing needed resources to recipients and their children--outweigh any unintended negative results--for example, the breaking up of families, reduction in work effort, or the fostering of a welfare "culture" that is passed on from parent to child. Recent research shows that although work effort is affected adversely by the generosity of welfare programs, effects on family structure appear quite weak, most welfare experiences are relatively short, and the majority of women who grew up in homes heavily dependent on welfare do not rely on those programs when they are young adults.

Adult↗

Effect of wheat fiber on blood lipids, fecal steroid excretion and serum iron.

Adding 36 g of wheat fiber for 3 weeks to the metabolically controlled diets of six subjects produced a significant increase in daily fecal weight from 70.8 g +/- 6.2 SEM to 217 g +/- 12.1; serum iron also fell by 21 micrograms/100 ml +/- 2.1 SEM (P less than 0.001) during the added fiber period (measured in five subjects) as did mean corpuscular volume and mean corpuscular hemoglobin. Fecal neutral steroid concentration (measured in four subjects) fell from 31 to 17.3 mg/g dry weight (P less than 0.05) but the change in neutral steroid output and in acid steroid concentration and output was not significant. No change was seen in the serum levels of cholesterol and triglyceride.

Adult↗