scholarly journals Effect of water temperature and pH on the concentration and time of ozone saturation

2018 ◽  
Vol 21 (0) ◽  
Author(s):  
Melicia Cintia Galdeano ◽  
Allan Eduardo Wilhelm ◽  
Isabella Borges Goulart ◽  
Renata Valeriano Tonon ◽  
Otniel Freitas-Silva ◽  
...  
Keyword(s):  
Water Temperature ◽  
Molecular Oxygen ◽  
Half Life ◽  
Low Ph ◽  
Ozone Content ◽  
Effect Of Temperature ◽  
Saturation Time ◽  
Gas Concentration ◽  
Ph Values ◽  
Effect Of Water

Abstract Ozone has been used for many years to disinfect water due to its oxidizing potential. Since it decomposes quickly into molecular oxygen, leaving no residue, it has important advantages for use. The decomposition of ozone is affected by the temperature and pH of the medium, low pH values and temperatures increasing its half-life, which can result in more efficient disinfection. With the objective of increasing the effectiveness of ozonation, this study investigated the effect of temperature (8 ºC and 25 °C) and pH (3.0 and 6.0) of the water on the saturation time and gas concentration, employing two initial gas concentrations (13.3 and 22.3 mg L-1). The concentration of ozone saturation increased as the temperature and pH of the medium decreased, as also with the higher initial gas concentration ( C0). The highest saturation concentrations were obtained at pH 3.0 and 8 °C (4.50 and 8.03 mg L-1 with C0 of 13.3 and 22.3 mg L-1, respectively). This higher ozone content could result in greater decontamination efficiency of the food products washed with this water.

Effect of temperature on streambed vertical hydraulic conductivity

2013 ◽  
Vol 45 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Weihong Dong ◽  
Gengxin Ou ◽  
Xunhong Chen ◽  
Zhaowei Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Water Temperature ◽  
Sediment Cores ◽  
Effect Of Temperature ◽  
In Situ Tests ◽  
Effect Of Water ◽  
Vertical Hydraulic Conductivity ◽  
Increasing Trend ◽  
Streambed Vertical Hydraulic Conductivity

In this study, in situ and on-site permeameter tests were conducted in Clear Creek, Nebraska, USA to evaluate the effect of water temperature on streambed vertical hydraulic conductivity Kv. Fifty-two sediment cores were tested. Five of them were transferred to the laboratory for a series of experiments to evaluate the effect of water temperature on Kv. Compared with in situ tests, 42 out of the 52 tests have higher Kv values for on-site tests. The distribution of water temperature at the approximately 50 cm depth of streambed along the sand bar was investigated in the field. These temperatures had values in the range 14–19 °C with an average of 16 °C and had an increasing trend along the stream flow. On average, Kv values of the streambed sediments in the laboratory tests increase by 1.8% per 1 °C increase in water temperature. The coarser sandy sediments show a greater increase extent of the Kv value per 1 °C increase in water temperature. However, there is no distinct increasing trend of Kv value for sediment containing silt and clay layers.

Effect of temperature on the behaviour of the endeavour prawns Metapenaeus endeavouri (Schmitt) and Metapenaeus ensis (De Haan) (Decapoda : Penaeidae)

1999 ◽  
Vol 50 (4) ◽  
pp. 327 ◽  
Author(s):  
Y. C. Park ◽  
N. R. Loneragan
Keyword(s):  
Water Temperature ◽  
Effect Of Temperature ◽  
Metapenaeus Ensis ◽  
Temperature Range ◽  
Effect Of Water ◽  
Controlled Conditions ◽  
The Mean

The effect of water temperature on the duration of emergence and speed of movement of adult endeavour prawns, Metapenaeus endeavouri and M. ensis, was investigated in the laboratory under controlled conditions from 20˚ to 32˚C. The behaviour of 50 prawns was recorded on videotape over 48 h at five temperatures (20˚, 23˚, 26˚, 29˚ and 32˚C). In general, both species emerged from the substratum during dusk and remained on the substratum until dawn or just before dawn when they buried again. At 32˚C, however, some M. endeavouri emerged for much less time and started to bury shortly after midnight. The mean daily duration of emergence for M. endeavouri varied with temperature and was higher at 26˚ and 29˚C (653 40 min per day) than at other temperatures. In contrast, the mean duration of emergence for M. ensis was not significantly affected by temperature (range of times 663 45 to 693 9 min). The pattern of the mean hourly speed of movement for M. endeavouri varied with temperature, whereas that for M. ensis was bimodal at most temperatures: they were more active during dusk (1700 to 1800 hours) and dawn (0400 to 0500 hours) than at other times.

Effect of Water Temperature on the Egg Hatch and Early Growth of Walleye Pollock (Gadus chalcogrammus)

2020 ◽  
Vol 32 (2) ◽  
pp. 78-83
Author(s):  
Jin Choi ◽  
Gyeong Sik Han ◽  
Ki Wook Lee ◽  
Soon-Gyu Byun ◽  
Hyun Jeong Lim ◽  
...  
Keyword(s):  
Water Temperature ◽  
Early Growth ◽  
Walleye Pollock ◽  
Egg Hatch ◽  
Effect Of Water

Determining the effect of water temperature on the T1 and T2 relaxation times of the lung tissue at 9.4 T MRI: A drowning mouse model

2021 ◽  
pp. 101836
Author(s):  
Kodama Saki ◽  
Hata Junichi ◽  
Kanawaku Yoshimasa ◽  
Nakagawa Hiroshi ◽  
Oshiro Hinako ◽  
...  
Keyword(s):  
Mouse Model ◽  
Water Temperature ◽  
Lung Tissue ◽  
Relaxation Times ◽  
T2 Relaxation ◽  
Effect Of Water ◽  
T1 And T2

Effect of water temperature on water consumption in female angora goats

1991 ◽  
Vol 1991 ◽  
pp. 163-163
Author(s):  
R.A. Cooper ◽  
Bryany Hill ◽  
J.A. Kirk
Keyword(s):  
Water Temperature ◽  
Water Intake ◽  
Water Consumption ◽  
Effect Of Water ◽  
Angora Goats ◽  
Definition Of ◽  
Few Data

It is commonly held that goats prefer their water ‘warm’ and that consumption may be encouraged by offering warmed water. Conversely, it is argued that water intake may go down if water is ‘too cold.’ There are, however, few data available and no definition of what constitutes ‘warm’ or ‘cold’ in the eyes of a goat. This trial was undertaken to provide some data in an attempt to confirm or refuse these conventional wisdoms.

The effect of water temperature on growth parameters of intensively reared juvenile peled Coregonus peled

2016 ◽  
Vol 48 (4) ◽  
pp. 1877-1884 ◽  
Author(s):  
Jan Matousek ◽  
Vlastimil Stejskal ◽  
Marketa Prokesova ◽  
Jan Kouril
Keyword(s):  
Water Temperature ◽  
Growth Parameters ◽  
Effect Of Water

scholarly journals Adaptation of Lactobacillus plantarum IMDO 130201, a Wheat Sourdough Isolate, to Growth in Wheat Sourdough Simulation Medium at Different pH Values through Differential Gene Expression

2011 ◽  
Vol 77 (10) ◽  
pp. 3406-3412 ◽  
Author(s):  
Gino Vrancken ◽  
Luc De Vuyst ◽  
Tom Rimaux ◽  
Joke Allemeersch ◽  
Stefan Weckx
Keyword(s):  
Gene Expression ◽  
Lactobacillus Plantarum ◽  
Differential Gene Expression ◽  
Lipoteichoic Acid ◽  
Low Ph ◽  
Exponential Growth Phase ◽  
Cellular Mechanisms ◽  
Content Type ◽  
Ph Values ◽  
Differential Gene

ABSTRACTSourdough is a very competitive and challenging environment for microorganisms. Usually, a stable microbiota composed of lactic acid bacteria (LAB) and yeasts dominates this ecosystem. Although sourdough is rich in carbohydrates, thus providing an ideal environment for microorganisms to grow, its low pH presents a particular challenge. The nature of the adaptation to this low pH was investigated forLactobacillus plantarumIMDO 130201, an isolate from a laboratory wheat sourdough fermentation. Batch fermentations were carried out in wheat sourdough simulation medium, and total RNA was isolated from mid-exponential-growth-phase cultures, followed by differential gene expression analysis using a LAB functional gene microarray. At low pH values, an increased expression of genes involved in peptide and amino acid metabolism was found as well as that of genes involved in plantaricin production and lipoteichoic acid biosynthesis. The results highlight cellular mechanisms that allowL. plantarumto function at a low environmental pH.

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