Disinfection performance of chlorine dioxide gas at ultra-low concentrations and the decay rules under different environmental factors

Experiments were conducted to investigate the effect of concentration and duration of chlorine dioxide gas treatment on Surface sterilization of grape at 25°C. The results showed that the values of inactivate bacterial log reduction ofBotrytis cinerea,Penicilliumandalternariaincreased with the increasing of ClO2gas concentrations and treatment time. When the concentrations and treatment time was about 10 mg/m3and 30 minutes, respectively, more than 4 log reduction was obtained for the three spoilage bacteria on grape surface. Furthermore, the effect of chlorine dioxide gas treatment on quality of grape was investigated. It was found that the contents of vitamin C (Vc) and reducing sugar (RS) in grape also increased compared with grape without ClO2gas treatment.

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Environmental Effects on Peppermint (Mentha piperita L.). I. Effect of Daylength, Photon Flux Density, Night Temperature and Day Temperature on the Yield and Composition of Peppermint Oil

Functional Plant Biology ◽

10.1071/pp9800685 ◽

1980 ◽

Vol 7 (6) ◽

pp. 685 ◽

Cited By ~ 61

Author(s):

RJ Clark ◽

RC Menary

Keyword(s):

Environmental Factors ◽

Flux Density ◽

Mentha Piperita ◽

Photon Flux ◽

Photon Flux Density ◽

Peppermint Oil ◽

Oil Composition ◽

Night Temperature ◽

Low Concentrations ◽

High Concentrations

Long days (16 h light), high photon flux density (1200 �Em-2 s-1.) and high night temperature (20°C) resulted in the highest oil yield. : Daylength, night temperature, day temperature and photon flux density were important interacting factors determining oil composition. The photosynthate model proposed by Burbott and Loomis (Plant Physiol., 1967, <B.42, 20-8) explained the effect of environmental factors with respect to pulegone, menthone and menthofuran. Factors favouring the maintenance of high levels of photosynthate resulted in high concentrations of menthone and low concentrations of pulegone and menthofuran. The photosynthate model does not explain the effect of environmental factors on several other monoterpenes.

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Correlation between Chlorophyll-a Concentration and Environmental Factors in Jihongtan Reservoir

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.959 ◽

2011 ◽

Vol 356-360 ◽

pp. 959-962

Author(s):

Ji Ping Ma ◽

Cui Jie Rui ◽

Jian Hua Ge ◽

Yu Hua Liu ◽

Zhi Wen Song ◽

...

Keyword(s):

Seasonal Variation ◽

Environmental Factors ◽

Dissolved Oxygen ◽

Statistical Method ◽

Chlorophyll A ◽

Potassium Permanganate ◽

Total Nitrogen ◽

Average Concentration ◽

Low Concentrations ◽

High Concentrations

Based on the Jihogntan reservoir’s monitoring data from 2006 to 2009, eutrophication of Jihongtan reservoir was assessed. The result showed that the nutrition level of the Jihongtan reservoir was middle in recent years. The average concentration of chlorophyll-a(Chla) was higher in summer and autumn than in spring and winter. The correlation between concentration of Chla and some environmental factors was studied by statistical method, and seasonal variation of Chla and the extent of eutrophication were also analyzed. The results showed that the correlations between Chla and total nitrogen(TN), dissolved oxygen(DO) and transparency were significantly negative, and that between Chla and total phosphorus(TP), temperature(T) and potassium permanganate index(COD Mn) were significantly positive. The growth of phytoplankton was promoted by TP and TN at low concentrations, and inhibited by TN at high concentrations.

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