H2-CH-6B flender gear units catalog Helical gear boxes H2

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2decit occurs, in which case one expects to see rises in anaerobic metabolites such as ethanol. If oxygen levels rise for some reason, then one should observe rise in all aerobic metabolites, compared to those of the normalCA prole. The CA concept is also applied to marketing of fresh produce with short shelf lives. Modied atmosphere (MA) packaging is method of passive induction of low-oxygenconditions in the immediate environment of the produce. The permeability of the packag-ing material, whether integral or perforated, in conjunction with the respiration activity of the packaged commodity determines the 2levels in the package. Changes in respiration rate due to temperature changes can result in anaerobic conditions and the developmentof off-odors in species such as broccoli (. These odors have been attributed to speciccompounds (, and efforts have been made to elaborate the mechanisms of formation( in order to improve product quality. Nevertheless, it is still unclear as to whether 5 Alvo et al. the compounds involved are the result of metabolic changes in the product or to the activity of microorganisms, even though the latter study was based on surface-sterilized material. CA has also been used for storage of some dry goods, and quality has been assessed by analysis of volatile proles. Volatile proles of Assam black tea leaves packaged indifferent conditions have been reported (. Samples were placed in standard tea pouches and lots of 4 were either vacuum packed at 2 mbar in polyethylene pouches laminated with 0.2- metallized polyester, packed in the same kind of pouches nitro- gen-ushed to /H1.0% 2, or held in standard atmosphere in 3- metallized polypro- pylene pouches. There were signicant differences in volatile proles after 1 and 4 weeks of storage. It was determined that 6 of 1 volatiles identied could serve as indica- tors of tea quality, and that the changes in these volatiles were consistent with oxidative deterioration, which could be