The apparatus and experimental technique which are described in this paper have been developed to determine continuously, automatically, and throughout the life of a plant, if desired, the carbon dioxide exchange and the transpiration in a chamber in which plants are growing under field conditions. This discussion give.s a general resume of our methods, including, first, a description of the eq...

In this study the influence of azelaic acid (AZA) 20% cream on the sebum excretion rate (SER) of 80 volunteers having mild to moderate acne vulgaris was demonstrated. Absorbent paper and Sebutape were used to collect the sebum and quantification was carried out by direct gravimetric method. It was shown that topical application of AZA creams could reduce the SER and number of acneic lesions...

3.04.1 The Superconducting Gravimeter 66 3.04.1.1 Historical 66 3.04.1.1.1 Early years at UCSD 66 3.04.1.1.2 Early commercial model TT instruments (1981–94) 67 3.04.1.1.3 The Compact SG (1994–2002) 68 3.04.1.2 Basic Principles of Operation 69 3.04.1.2.1 Superconducting components 69 3.04.1.2.2 Displacement transducer and feedback system 71 3.04.1.2.3 Temperature control 71 3.04.1.2.4 Tilt compe...

Several methods are known for the detection of traces of solvents in oil or paraffin. A gravimetric method (3) and a rapid colorimetrie method for the determination of residual solvents (4) are not sensitive enough. The same is true for the method developed by Eisdorf er &,Mehlenbacher (5) for the detenninatipn of trichloroethylene in plant oils after extraction with xylene. Rather sensitive de...