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Biomedical subjects

C Valverde

Publications and source records attributed to C Valverde.

At least 55 records · Page 3Linked to original sources
PubMedDate not supplied

[Changes in the hierarchical structure of Mexico's national settlement system].

"This paper uses an economic index to describe the hierarchical structure of the national settlement system and describes the changes among the sixties, eighties and nineties. We found great territorial changes for the first period. The conclusions proposed are that there is a decentralisation at [the] national level, but at the same time, there is a centralisation at [the] regional level." (SUMMARY IN ENG)

Americas↗
PubMedDate not supplied

The importance of employing homologous serum free of thyronines in radioimmunoassays to assess circulating thyroid hormones in rainbow trout.

Although abundant, available information regarding the values of circulating thyronines in the rainbow trout is misleading and confusing. The present study demonstrates the importance of maintaining species serum-homology when measuring thyronines with RIA to avoid spurious results. The utilization of homologous (trout) serum free of thyronines in the standard curve allowed the standardization of accurate and specific radioimmunoassays to quantitate circulating T3 and T4 levels in 10 microliters of rainbow trout serum. Detection limit was 50 pg for both thyronines. Inter- and intra-assay coefficients of variation were minor to 10%. Mean values for T3 and T4 +/- SEM in the trout population studied (n = 34) were 23.6 +/- 1.2 and 12.0 +/- 2.3 ng/ml respectively. A positive and significant correlation (p < 0.005) between body weight and T3 was observed, confirming the active participation of this thyronine in growth processes.

Animals↗
PubMedDate not supplied

[Early introduction of dairy formulas in infant feeding].

Frequency, main features and factors associated to introduction of supplemental artificial milk formula at the first month of life were studied in 365 infants born from June 1st, through October 31, 1980, who were under control at a well baby clinic of Santiago, Chile, along years 1986 throughout 1987. By means of life-table analysis, time length of breast feeding was measured and compared in children with and without early formula introduction. In 22.5% of infants an artificial milk formula was given (82/365). In 80% of the cases (66/82) this was done upon instructions of health personnel on grounds of poor weight increase. Early introduction of formula negatively influenced duration of breast feeding which attained a median length of three months in artificially fed infant against ten months in those exclusively breast fed. Main features of infants and mothers prone to early formula introduction were maternal age 35 years or over, previous breast feeding shorter than six months, illegitimacy or first child, fourth or over in birth order, low birth weight and, or, hospital admission in the first four weeks of life. No influence was identified from educational level, of maternal work, desired or unwanted pregnancy, maternal nutritional status in the last three months of pregnancy, child spacing, type of delivery, sex and gestational age of the infants.

Age Factors↗
PubMedDate not supplied

[Prader-Willi syndrome].

Explore the source record for details and available documents.

Abnormalities, Multiple↗