We read with interest in the April 1993 issue of Chest the artide by Liss and Payne’ on “Stability of Blood Gases in Ice and at Room Temperature.” Although some authors would agree that the small changes observed in Pco , and pH when the arterial blood samples were kept at room temperature make it unnecessary to maintain arterial blood in ice if gas analysis is done within 30 mm, several commen...

FRESH-CUT PRODUCE by ROBIN GWEN SALINSKY BROEKER (Under the Direction of Mark Harrison) ABSTRACT Foodborne botulism is a potentially lethal neuroparalytic illness resulting from ingesting C. botulinum neurotoxins. There is little information concerning the stability of preformed toxin on fresh produce. This research determined the stability of toxin type A on whole grape tomatoes, pre-cut lettu...

Enteroviruses survived for up to 38 days without diminishing in numbers in extended-aeration sludges maintained at 5 degrees C. In oxidation ditch sludges similarly maintained, enteroviruses survived for up to 17 days without diminishing in numbers. The pHs of the sludges in this study were well inside the pH 6 to 8 corridor in which destruction of enteroviruses by the detergents and ammonia pr...

Several years ago, Burton and Jura' reported a calculation that was based on an Einstein model and that predicted a structural phase transition for the (100) surface of Ar. On the basis of this calculation, one might expect to be able to observe such a surface phase transition in noble-gas solids and other fcc materials, such as Al and Ni. We show in Fig. 1(a) the unrearranged fcc (100) surface...

The stability of radiance measurements taken by the Sky Quality Meter (SQM)was tested under rapidly changing temperature conditions during exposure to a stable light field in the laboratory. The reported radiance was found to be negatively correlated with temperature, but remained within 7% of the initial reported radiance over a temperature range of -15 °C to 35 °C, and during temperature chan...

Silicon carbide (SiC) has been used for many conventional applications that require mechanical and chemical stability at high temperatures. Mechanical stability is defined as the ability of a particular material to preserve its mechanical properties – elasticity, fracture toughness, hardness – at temperatures below and above room temperature. Chemical stability is similarly defined as the abili...

conclusions in lighting conditions, most of t-res was isomerized to the other isomer cis-resveratrol. t-res is unstable in alkali ph and when exposed to light. t-res was quite stable at other conditions, and several freeze-thaw cycles did not have any effect on its stability. results our findings revealed that t-res was quite stable in different temperatures ranging from -70 °c to 25 °c, and ac...

In this article CuO/water nanofluid was synthesized by using polyvinylpyrolidone (PVP) as the dispersant.  Thenanofluid stability period and the heat transfer enhancement were determinedby measuring the thermal conductivities. To study the nano-fluid stability, zeta (ζ) potential, and absorbency were measured under different pH values and PVP surfactant concentrations; also thermal conductivity...

The NICMOS detectors are sensitive to the operating temperature. During the Cycle 7 era, NICMOS was cooled through cryogenic solid nitrogen. This resulted in an operating temperature varying from 61K to 62.5K before the nitrogen was exhausted. Using the new NICMOS Cooling System (NCS), the nominal temperature is significantly more stable, but at a higher temperature, 77.15 K. The stability of t...