In connection with a physiological study of six tomato varieties, the need for a method of measuring simultaneously the respiration rate of the leaves of several replicates of these varieties arose. BONNER and WIDMAN (1) have reported on the use of the Warburg apparatus for measuring the respiration of spinach leaves. They obtained highly reproducible rates of gas exchange from 200 milligram sa...

A robust oxygen-flask combustion system was developed using light beam ignition. An appropriate amount of environmental sample was wrapped with a small piece of filter paper and held in a basket made of platinum-zirconium spiral. After the sample was inserted into an oxygen-filled flask containing an acid mixture, the light beam from an overhead projector lamp was focused to ignite the sample. ...

The differing requirements for concurrency models in programming languages and databases are widely diverse and often seemingly incompatible. The rigid provision of a particular concurrency control scheme in a persistent object system limits its usefulness to a particular class of application, in contrast to the generality intended by the provision of persistence. One solution is to provide a f...

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