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Cake day: March 11th, 2024

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  • You can say “nanograms per kilogram.” You could shorten it to “nanograms per kilo.”

    If it were mg/kg, you could say “migs per kig.” You won’t trick me into saying the equivalent for nanograms, though.

    Edit: Not sure what you mean by how to write it as a decimal number. It’s 0.0000000021g per kg. It wouldn’t be standard to give just a ratio of like mass to mass because as others have written it is mass of substance vs mass of patient.












  • Another side point not mentioned here otherwise: genomic imprinting.

    As a general rule, genes are expressed whether they came from the mother or father. Understanding just that general rule will give one a good grasp of the principles. But bill often has exceptions. There are a few genes which are “imprinted” in sperm or eggs and are not equally expressed during development. The imprinting tends to favor paternal gene copy expression and typically involves epigenetic modification of the chromosome structure. The sequence of the nucleotides in the genes doesn’t change, but the DNA itself may be chemically modified, e.g. with methyl groups added to cytosines. Those modifications recruit proteins which tend to suppress gene expression and maintain the methylation patterns over time.