Life Sciences Commons^™

The Physical State Of Potassium Ion In The Living Cell, G. N. Ling

Scanning Microscopy

This review summarizes more than 30 years of experimental testing (and confirmation) of a key postulate of the association-induction (AI) hypothesis: most K⁺ ions in resting cells are adsorbed on 𝛃-and 𝛄-carboxyl group of cell proteins in a close-contact one ion-one site manner. Failure of healthy, cytoplasm-free, squid axon-membrane sacs to selectively accumulate K⁺ over Na⁺ and success of muscle cells without a functional cell membrane (and postulated pumps) to achieve the same, point to the cytoplasm as the seat of selective K⁺ accumulation. Four independent techniques unanimously confirmed the predicted localization in striated muscle cells, …

The Adsorption Of Crystalline Fat To The Air-Water Interface Of Whipped Cream, B. E. Brooker

Food Structure

The interfacial structure of air bubbles in normal and defective whipped creams were compared, using freeze fracturing and transmission electron microscopy , in an attempt to understand the underlying mechanism of t he observed gross differences in their whipping times and overruns . In normal whipped creams sparsely distributed fat crystals were found to have penetrated some of the bubbles and were lying in the plane of the air/water interface.

In defective whipped creams , large numbers of needle-like crystals had penetrated the air/water interface of every bubble and, as a consequence, reduced numbers of fat globules were found to …