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Results for “HARDNESS”

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At least 109 records · Page 6Linked to original sources
PubMed2000

Ask the doctor. I am generally healthy, but I had a heart attack last year. At my age, 78 years old, I find it hard to take it seriously when my doctor and my children tell me that I should be lowering my cholesterol and exercising. It seems to me that the idea of trying to prevent "premature" death is silly in someone my age. It's not like I feel ready to die, but it's hard for me to believe that prevention works in someone who has already gone beyond his "three score ten" years.

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Age Factors↗
PubMed2002

Mass spectrometric monitoring of the degradation and elimination efficiency for hardly eliminable and hardly biodegradable polar compounds by membrane bioreactors.

Wastewaters containing or spiked with polar compounds--alkylphenolethoxylates (APEOs) and drugs--were treated in membrane-assisted and conventional biological pilot plants to eliminate these pollutants. Elimination resulting in metabolization or ultimate degradation was pursued by substance-specific analysis applying atmospheric pressure chemical ionization (APCI) in combination with mass and tandem mass spectrometric detection (MS and MS-MS) either in the flow injection (FIA) or liquid chromatographic separation (LC) mode. APEOs were diminished by successive cleavage of polyether chain links resulting in short chain APEOs or alkylphenols (AP), if the biocoenosis was adapted to the compounds. Lipid regulating agents (LRA) were either eliminated completely (etofibrate), metabolized to fenofibratic acid (fenofibrate) or diminished to a minimal extent (bezafibrate). Compared to the membrane microfiltration process the conventional activated sludge process was less successful in both APEO and LRA elimination.

Biodegradation, Environmental↗