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Biomedical subjects

A Lawson

Publications and source records attributed to A Lawson.

68 records · Page 4Linked to original sources
PubMed1967

Studies on amino acid decarboxylases in Escherichia coli.

The isolation of highly active preparations of glutamate decarboxylase, arginine decarboxylase and histidine decarboxylase from Escherichia coli is described. These preparations showed strict specificity, and were in each case resolved into apo- and co-enzyme as shown by the significant restoration of activity that took place on addition of pyridoxal 5-phosphate.

Amino Acids↗
PubMedDate not supplied

Sober view of AIDS.

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Acquired Immunodeficiency Syndrome↗
PubMedDate not supplied

Evaluating organic compound migration in poly(ethylene terephthalate): a simple test with implications for polymer recycling.

The safety of recycled plastics for food contact use is largely dictated by the ability of post-consumer organic contaminants to absorb into recycled materials and later diffuse from containers made from recycled plastics into the food supply. Diffusion and solubility data for organic contaminants in poly(ethylene terephthalate) (PET) are scarce. An approach for determining permeability constants, diffusion coefficients and solubility constants of slowly migrating contaminants in PET is described. Compounds (neat or in admixture) were heat-sealed in packets made from thin (0.00127 cm) PET films. Packets were placed in containers with GC sampling closures. Headspace (volatile compounds) or an external liquid medium (non-volatile compounds) was analysed for emergence of the compound. Diffusion coefficients were determined from non-steady state diffusion equations, permeability constants were determined from steady state permeation, and solubility constants were calculated from diffusion and permeability values. Diffusion coefficients (25 degrees C) ranged from 10(-9) to < 10(-16) cm2/s. The diffusion coefficient of benzene increased dramatically with concentration. Compounds with high permeation increased the transport rate of slower permeating volatiles.

Conservation of Natural Resources↗
PubMedDate not supplied

[Perinatal factors which affect low birth weight].

The incidence of low-birth weight babies in the Santo Tomás maternity ward was 9% between the first of August of 1992 and the 31 of July of 1993. We found a higher risk of having low birth weight babies if the mother was toxemic, without prenatal care of low socioeconomic status and if she was single. We did not find an association with adolescence, short mother's height, low educational status and primi- or multiparity of 5 or more.

Apgar Score↗