منابع مشابه
Soaps, shampoos, and detergents.
In clinical dermatology, few questions are asked more commonly than “What is the best way for me to clean my skin or hair?” The modern dermatologist needs to be familiar with the physiologic action of cleansing products available on the market. This familiarity should include chemical composition, application, cosmetic benefits, and safety, as well as potential hazards. This knowledge must be a...
متن کاملCepheid Standard Candles
Thanks to HST, there are now many galaxies with Cepheid distances and these provide the main platform for the calibration of the secondary distance indicators. I review recent progress in our understanding of the standard candle properties of Cepheids with particular emphasis on the techniques used in the HST studies. The PL relation defined by Cepheids in the LMC is shown to be excellent, alth...
متن کاملStudies of Aluminum Soaps
I t has been shown by McBain and collaborators I that aluminum soaps present characteristics somewhat akin to proteins in their lyophilic colloidal behavior. These soaps, particularly the aluminum disoaps AIOHR~, are solids which can be prepared relatively pure. No macroscopic crystals have yet been obtained but powder x-ray diffraction patterns show structures varying from almost amorphous to ...
متن کاملJudging the soaps.
Background Go on, admit it. However much you may dismiss soap operas, at some point in your life you’ve been fascinated by them. Maybe as a teenager coming home early from school, as a medical student taking a break from exams, or as a young parent at home with the children, you too have been drawn into the world of ‘The Street’ or ‘The Square’ – or even ‘The Police Station’. You too have been ...
متن کاملPulsars as Standard Candles
To illustrate the standard candle property of gamma-ray pulsars (and also to thereby confirm the recent first-principle calculation of pulsar gamma-ray emission), we “measure”, via the lightcurve fitting, three distances and one moment of inertia of some weak pulsars. We are not sure what the three distances are good for, but the measurement of the moment of inertia must be of interest for nucl...
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ژورنال
عنوان ژورنال: Nature
سال: 1888
ISSN: 0028-0836,1476-4687
DOI: 10.1038/038292a0