Preservation of bacteria at the temperature of dry ice (-78.5 C) is a particularly valuable method for the maintenance of such organisms as Treponema pallidum which otherwise require continuous animal-to-animal passage. Turner (1938), Turner and Fleming (1939), and Turner and Brayton (1939) demonstrated that at the temperature of dry ice T. pallidum and relapsing fever spirochetes retain their ...

The microbial process of methane (CH4) production during the back-freezing of permafrost soils in autumn and the future fate of produced CH4 in the thawing phase of the following spring are not well understood. Long-term CH4 flux studies in the Lena Delta (Siberia) indicate that back-stored CH4 adds to the emission of newly-produced CH4 at the beginning of the vegetation period. Further field a...

The lack of a standard test method for evaluating the resistance of pervious concrete to cycles of freezing and thawing in the presence of deicing salts is the motive behind this study. Different sample size and geometry, cycle duration, and level of submersion in brine solutions were investigated to achieve an optimized test method. The optimized test method was able to produce different level...

This paper reviews the effects of freezing/thawing on technological properties of meat. Thus, the effects of freezing/thawing on drip loss have been presented. At the same time, novel thawing methods opposing conventional ones have been considered.

Objective. To determine the freezing and thawing rates necessary to maintain sperm viability during cryopreservation of Bocachico semen. Materials and methods. Four interactional treatments were implemented between two freezing (rapid and slow) and two thawing (rapid and slow) curves, in a 2x2 factorial as follows: rapid freezing-rapid thawing, rapid freezing-slow thawing, slow freezingrapid th...

The resistance of concrete structures to the impact cyclic freezing and thawing is one key long-term characteristics, which further determines operation its service life. To date, alternating freeze-thawing cycles under various operating conditions has been little studied related several manufacturing processes: simple vibrated, variotropic centrifuged, improved vibrocentrifuged. purpose this s...

BACKGROUND The aim of this study was to perform validation of the thawing process for solvent/detergent-treated plasma octaplasLG® using different thawing devices. Optimized settings for temperature and thawing time should be defined based on the results of both temperature measurements and extensive biochemical characterization studies. METHODS octaplasLG units were thawed using water bath s...