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Biomedical subjects

H Klaus

Publications and source records attributed to H Klaus.

At least 37 records · Page 2Linked to original sources
PubMed1979

[Determination of aluminum in foods].

In connection with studies on the changes of functional properties of food constituents (e. g. solubility of proteins) by means of aluminium compounds, the elaboration of an appropriate method for the quantitative determination of aluminium has been necessary. The organic samples are mineralized with 80% perchloric acid; in case of fat-containing foods, after fat removal. After reaction with aluminon (ammonium salt of aurin tricarboxylic acid), aluminium is determined photometrically at 530 nm. The limit of detection lies between 1 and 2 ppm; the recovery rate is 103%; the standard deviation is +/- 10%. The determination (without mineralization) requires about 1 hours. The authors analyzed, inter alia, milk (1.2--1.7 ppm A1), fat cheese (9 ppm), micora (4 ppm), aluminium-stabilized protein texturates (300--1500 ppm).

Aluminum↗
PubMed1979

Use-effectiveness and client satisfaction in six centers teaching the Billings Ovulation Method.

Use-effectiveness of the Billings Ovulation Method (OM) is reported for 1139 clients from six centers who were followed for at least 24 months. Method failure rates were 1% when calculated by either Pearl formula or life table analysis. Combined method and user failure rates were 20% when calculated with the Pearl formula, and 16% at 12 months and 23% at 24 months by life table analysis. Pregnancy rates were higher for couples using OM alone, than for couples using OM in combination with additional fertility awareness methods or together with barrier methods. The difference was significant when estimated by the Pearl formula but not when analyzed by the life table. The emotional implications underlying the apparent contradiction between a desire to avoid pregnancy and the deliberate coital use of fertile days are reflected in the differences between method and user failure rates, the high client satisfaction levels reported with "user failure," and 56% continuation rate at 24 months. The will require in-depth exploration.

Abortion, Legal↗
PubMed1977

Use-effectiveness and analysis of satisfaction levels with the Billings Ovulation Method: two-year pilot study.

A 2-year study of 135 women using the Billings Ovulation Method as their method of family planning is reported. There were 1381 exposure cycles during the 1st year and 580 during the 2nd year. The total conception rates were 1.303 for the 1st year and 1.896 for the 2nd year. If one subtract the user failures from these rates, the biologic failure rates are 0.072 for the 1st year and 0.517 for the 2nd year. The continuation rate is 51.8%. An analysis of satisfaction levels is presented with a discussion of possible underlying emotional factors.

Contraception↗
PubMed1976

[Measurement of emulsion stability].

For the routine assessment of the stability of water-in-oil emulsions, the authors suggest to determine the beginning of de-emulsification or to measure the stability constant at 38 degrees C., since these methods yield fairly reproducible results and require but little time and laboratory outfit. More accurate results will be obtained only by conductance measurements.

Chemical Phenomena↗
PubMed1975

Norlestrin-induced pseudopregnancy in the baboon. Effects on blood coagulation and endocrine glands during attempted production of Sheehan's syndrome.

Production of Sheehan's syndrome was attempted. As it was not possible to obtain pregnant baboons initially, pseudopregnancy was induced with norlestrin, 2.k mg., for 3 and 4 months, respectively. Sheehan's syndrome was not produced with massive hypovolemic shock but failure to obtain true pregnancy has given serendipitous information on the long-term action of norlestrin on the pituitary and its target organs. Unusual abundance of prolactin acidophils and decrease of growth hormone acidophils was found. Further studies will be necessary to show the possible significance of these findings. As fibrin degradation products did not appear in the serum, we can make no inference about the necessity of intravascular coagulation for the production of Sheehan's phenomenon. Finally one animal became pregnant. Sheehan's phenomenon was not produced in her despite induction of intrapartum hypovolemic shock. Histologic findings in her pituitary resemble those of the pseudopregnant animals.

Animals↗