Modified Atmospheres
Mostrando 13-22 de 22 artigos, teses e dissertações.
-
13. Production of Patulin by Penicillium expansum
Twenty-seven isolates of Penicillium expansum Lk. ex Thom obtained from Europe, Australia, and North America from seven different fruit hosts all produced patulin in culture. Six isolates were essentially nonpathogenic in apple fruits. In culture, patulin generally accumulated to much higher levels than in apple fruits. At all temperatures permitting fungus
-
14. Effect of Modified Atmosphere Composition on the Metabolism of Glucose by Brochothrix thermosphacta
The influence of atmosphere composition on the metabolism of Brochothrix thermosphacta was studied by analyzing the consumption of glucose and the production of ethanol, acetic and lactic acids, acetaldehyde, and diacetyl-acetoin under atmospheres containing different combinations of carbon dioxide and oxygen. When glucose was metabolized under oxygen-free a
American Society for Microbiology.
-
15. Inhibition of T-2 toxin production on high-moisture corn kernels by modified atmospheres.
The fungus Fusarium sporotrichioides, capable of producing T-2 toxin (T-2), was grown on irradiated corn kernels remoistened to 22% and kept in atmospheres of different CO2-O2 combinations. The production of T-2 was totally inhibited under 60% CO2-20% O2, whereas only trace amounts were detected when the gas combination was 40% CO2-5% O2. Under all other com
-
16. Respiration and Protein Synthesis in Nongrowing Cultured Pear Fruit Cells in Response to Ethylene and Modified Atmospheres: A Model System for Fruits Postharvest
The respiration of pear fruit (Pyrus communis L. Passe Crassane) cells was monitored after subculture into an auxin-free, mannitol-enriched medium in which the cells remained viable but did not grow. Respiration rates were affected by the presence or absence of sucrose in the medium even though the cells retained reserves of sucrose and starch. Provided the
-
17. Genetic Adaptation to Elevated Carbon Dioxide Atmospheres by Pseudomonas-Like Bacteria Isolated from Rock Cod (Sebastes spp.)
The microorganisms on rock cod fillets stored in a modified atmosphere (MA; 80% CO2-20% air) at 4°C for 21 days were isolated. Only Lactobacillus sp. (71 to 87%) and tan-colored Pseudomonas sp.-like isolates (TAN isolates) were found. The TAN isolates grew more slowly in MA than in air at 8°C. When TAN isolates were grown in air at 8°C and then transferre
-
18. Response of Airborne Mycoplasma pneumoniae to Abrupt Changes in Relative Humidity
The effect of an abrupt change in the relative humidity on the viability of airborne Mycoplasma pneumoniae has been examined. When the microbial aerosols were permitted to equilibrate in air held at either low or high humidities and were then subjected to a sudden shift to a mid-range humidity, a significant loss (>90%) of the colony-forming units per liter
-
19. Microbiological Analysis of Rock Cod (Sebastes spp.) Stored Under Elevated Carbon Dioxide Atmospheres
The numbers and types of microorganisms on fresh rock cod fillets and fillets stored in air or in a modified atmosphere (MA; 80% CO2, 20% air) at 4°C were compared. Samples were analyzed after 0, 7, 14, and 21 days of storage. The isolation plates were incubated aerobically, anaerobically, or under MA at 4, 20, or 35°C. After 7 days of storage in air, the
-
20. Analysis and Validation of a Predictive Model for Growth and Death of Aeromonas hydrophila under Modified Atmospheres at Refrigeration Temperatures
Specific growth and death rates of Aeromonas hydrophila were measured in laboratory media under various combinations of temperature, pH, and percent CO2 and O2 in the atmosphere. Predictive models were developed from the data and validated by means of observations obtained from (i) seafood experiments set up for this purpose and (ii) the ComBase database (ht
American Society for Microbiology.
-
21. The role of cavities in protein dynamics: Crystal structure of a photolytic intermediate of a mutant myoglobin
We determined the structure of the photolytic intermediate of a sperm whale myoglobin (Mb) mutant called Mb-YQR [Leu-(B10)→Tyr; His(E7)→Gln; Thr(E10)→Arg] to 1.4-Å resolution by ultra-low temperature (20 K) x-ray diffraction. Starting with the CO complex, illumination leads to photolysis of the Fe–CO bond, and migration of the photolyzed carbon mon
The National Academy of Sciences.
-
22. Factors Affecting Isolation and Identification of Haemophilus vaginalis (Corynebacterium vaginale)
The rate of isolation of organisms resembling Haemophilus vaginalis (Corynebacterium vaginale) from vaginal specimens was not significantly affected by anaerobic versus carbon dioxide incubation atmospheres or whether specimens were inoculated on isolation media immediately after collection or after a delay of 6 h. Forty-one clinically isolated strains were