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Biomedical subjects

R Venkateswaran

Publications and source records attributed to R Venkateswaran.

4 recordsLinked to original sources

A motorized microdrive for recording of neural ensembles in awake behaving rats.

The recording of neural ensembles in awake, behaving rats has been an extremely successful experimental paradigm, providing demonstrable scientific advances. Dynamic control of the position of the implanted electrodes is of key importance as mobile electrodes provide a better signal-to-noise ratio and a better cell/ electrode yield than nonmobile electrodes. Here we describe the use of low cost, soon to be commercially available dc motors to successfully control the depth of electrodes. The prototype designed is approximately 30 mm in diameter and 50 mm in length and weighed about 30 gms. This paper presents the results of linear displacements of electrodes achievable with this motorized microdrive.

Action Potentials↗

Childhood iron deficiency anemia, maternal nutritional knowledge, and maternal feeding practices in a high-risk population.

BACKGROUND: Despite the proven success of national efforts such as the Special Supplementary Food Program for Women, Infants, and Children (WIC) to curb childhood iron deficiency anemia (IDA) in the United States, aggregate programmatic data may not accurately represent the experience of particularly high risk groups, such as the children of adolescent mothers of low socio-economic status. METHODS: This study evaluated the prevalence and severity of childhood anemia and associated risk factors, at one urban teen health center serving primarily low-income adolescent mothers and their children. A total of 175 pediatric WIC charts were reviewed to abstract hemoglobin status and other data. Additionally, 81 mothers were interviewed with regard to their nutritional knowledge and feeding practices; these findings were compared with the measured hemoglobin (Hgb) of their children. RESULTS: A total of 34.9% of children in the study population were found to be anemic (Hgb </= 11. 2). Low childhood Hgb status was significantly correlated with racial identification, child age, maternal perception of feeding difficulty, and the presence of concurrent pediatric medical illness. Report of extensive nutritional discussion with a physician was correlated with normal Hgb levels. No differences in nutritional knowledge or feeding practices were detected between mothers of children with low iron status. CONCLUSIONS: We conclude that the risk of iron deficiency, even among children receiving WIC services, may be underestimated in certain "nutritionally very high risk" populations. Further study of interventions for IDA in children of young, low-income mothers is recommended.

Adolescent↗

Iron deficiency and maternal feeding practices among high-risk urban children.

This study evaluated the nutritional knowledge and feeding practices (via a verbal questionnaires) of the clients of one semiurban women, infants, and children (WIC) center, which serves exclusively younger women (aged 12-21) and their children, and compared these variables to the hemoglobin levels of their infants and children. No significant benefit from documented WIC education regarding iron was detectable. African American identification was associated with childhood anemia (p = 0.05); the presence of concurrent medical problems approached significance (p = 0.06). Other previously reported risk associations were not found to be significant. Children with low iron ate more meals outside the home per week (2.9 vs. 1.9, p = 0.10). Despite the proven value of the WIC program in reducing childhood iron deficiency, it appears that members of certain very high-risk populations may not experience the full benefit of this nutritional program and may require additional, targeted interventions.

Adolescent↗