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Biomedical subjects

N S Nelson

Publications and source records attributed to N S Nelson.

11 recordsLinked to original sources
PubMed1992

Bone cancer risk estimates.

Due to confusion between endosteal (bone surface) dose and average skeletal dose, ICRP 60 has substantially overestimated the risk of radiogenic bone cancer. This confusion apparently stems from an incorrect reading of the BEIR IV report, which does not clearly draw this distinction. It should also be noted that what appear to be summary numerical risk estimates for bone sarcoma induction in BEIR IV and BEIR V refer only to average skeletal dose as calculated for 224Ra.

Bone Neoplasms↗
PubMed1975

The growing conceptus of the domestic cat.

The feline conceptus is similar to larger mammals rather than to rodents in the amounts of fetal fluids and the contribution of the fetus to the total volume of the conceptus. When growth rates of several mammals are compared as Gompertzian functions, the feline fetus is more similar to that of the guinea pig or beagle than that of the mouse, rat, man, sheep or cow. The feline Gompertzian growth starts at about the 6th day of gestation. The weight of the fetus, +/- 10%, as a function of gestational age starting on day 28 is: Weight in grams = 2.6477 X 10(-10) exp (see article) when t = gestational age of 28 days or more. The feline weight to crown-rump relationship can most easily be expressed as a power function where: Crown-rump length in cm = 2.69 (weight in grams) 0.3508; with an error term of +/- 5%. The relationship of three variables gestational age, fetal weight, and fetal crown-rump length can also be expressed mathematically: Gestational age in days = 15.335 + 3.9805 (crown-rump length in cm) -0.0675 (weight in grams) Equations for crown-rump length or weight were calculated, but the inaccuracy of these expressions is too great to allow practical use.

Animals↗