scholarly journals Iron sulfate and phosphite products fail to suppress snow mold on amenity turfgrass in Wisconsin

cftm ◽  
2021 ◽  
Author(s):  
P. L. Koch ◽  
K. Hockemeyer
Keyword(s):  
Iron Sulfate ◽  
Snow Mold

Polygalacturonase isolated from the culture of the psychrophilic fungus Sclerotinia borealis

1997 ◽  
Vol 43 (5) ◽  
pp. 417-424 ◽  
Author(s):  
Toshihide Takasawa ◽  
Keiko Sagisaka ◽  
Koichi Yagi ◽  
Kyoko Uchiyama ◽  
Atsushi Aoki ◽  
...  
Keyword(s):  
Culture Medium ◽  
Enzyme Reaction ◽  
Wheat Seedling ◽  
Maximum Activity ◽  
Reducing Sugar ◽  
Pectic Acid ◽  
Snow Mold ◽  
Viscosity Change ◽  
Optimum Ph ◽  
Psychrophilic Fungus

A polygalacturonase was isolated from the culture medium of Sclerotinia borealis, a psychrophilic fungus that grows on lawn and wheat seedling under the snow in winter and induces the snow mold disease. Pectic acid was a better substrate of this enzyme than pectin when the activity was determined by measuring the reducing sugar produced. However, when the activity was measured by viscosity change, the viscosity of pectin decreased more rapidly than that of pectic acid. The results of viscosity change apparently indicate that the polygalacturonase catalyzes pectin hydrolysis as an endo-type enzyme. Highly methyl-esterified pectin was a poor substrate, as determined by measurements of reducing sugar production and viscosity change. It is suggested from the results that the methoxy group of pectin affects the polygalacturonase reaction. A reaction mechanism was proposed for the polygalacturonase reaction. Molecular mass of this enzyme was 40 kDa and its isoelectric point was pH 7.5. Optimum pH of the enzyme reaction was 4.5 and its optimum temperature was 40–50 °C. Thirty percent of the maximum activity was observed at 5 °C, but it was only slightly active above 60 °C. The activity was preserved for more than 2 years at 5 °C and pH 4.5, but it was lost when kept at room temperature overnight or heated at 50 °C for 30 min. The amino acid sequence of the N-terminal region of the psychrophilic polygalacturonase of Sclerotinia borealis is compared with those of polygalacturonases of mesophilic fungi. The function of this enzyme against the target plants is discussed with reference to the reaction of polygalacturonases of mesophilic fungi.Key words: polygalacturonase, pectin-hydrolyzing enzyme, psychrophilic fungi, snow mold disease, Sclerotinia borealis.

Effect of Iron sulfate as electrolyte additive on plasma electrolytic oxidation of aluminum alloy

2016 ◽  
Vol 52 (4) ◽  
pp. 658-664 ◽  
Author(s):  
Ali Abolhassani ◽  
Mahmood Aliofkhazraei ◽  
Seyed Saeed Farhadi ◽  
Alireza Sabour Rouhaghdam
Keyword(s):  
Aluminum Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Iron Sulfate ◽  
Electrolyte Additive ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Measurements of spatial-temporal structures in precipitated iron sulfate

1993 ◽  
Vol 344 (1-2) ◽  
pp. 107-118 ◽  
Author(s):  
M.U. Kleinke ◽  
O. Teschke ◽  
M.A. Tenan
Keyword(s):  
Iron Sulfate ◽  
Temporal Structures

scholarly journals STUDY ON DYES ADSORPTION FROM AQUEOUS SOLUTION USING RED MUD ACTIVATED BY SULFURIC ACID

2019 ◽  
Vol 62 (11) ◽  
pp. 143-149
Author(s):  
Vu Xuan Minh ◽  
Nguyen Tuan Dung ◽  
Hương T. M. Le
Keyword(s):  
Red Mud ◽  
Textile Industry ◽  
Solid Phase ◽  
Second Order ◽  
Iron Sulfate ◽  
Activation Process ◽  
Acid Activation ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Reactive Red 195

The textile industry wastewater contains the majority of different dyes which are quite toxic and should be removed before disposal. They are often highly resistant for biodegradation and hence are difficult to be treated. The application of adsorbents of natural origin, especially industrial waste, is one of the most attractive solutions for wastewater treatments due to its high socio-economic advantages. In this study, the adsorption capacity of acid activiated red mud for some conventional dyes such as Reactive Red 195 and Direct Yellow 132 was investigated. In this acid activation process part of aluminum oxide, iron oxide on red mud will be dissolved into solution, thereby increasing the specific surface area of the remaining solid phase (from 55 m2/g to 92 m2/g). The amount of red mud dissolved in the solution is about 30% weight. Solid residue is used in this adsorption study. The solution obtained after activation which includes iron sulfate salts, aluminum sulfate used as a coagulant for wastewater treatment. The results showed that, for both dyes, pH 5 is most suitable for the adsorption processes. The adsorption kinetic was based on the pseudo second-order kinetic equation. The rate constants of the second-order model for adsorption of DY132, RR195 on RMA in a solution with a concentration of 100 mg·l-1, pH = 5 are 1.48 and 1.95·10-2 g/(mg·min), respectively, and the equilibrium adsorption capacities are 42.74 and 54.95 mg·g-1, respectively. The adsorption data were well matched to Langmuir isotherm model. The maximum adsorption capacities were found to be 48.54 and 84.31 (mg·g-1) for Reactive Red 195 and Direct Yellow 132, respectively.

scholarly journals Persulfate Process Activated by Homogeneous and Heterogeneous Catalysts for Synthetic Olive Mill Wastewater Treatment

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3010
Author(s):  
Eva Domingues ◽  
Maria João Silva ◽  
Telma Vaz ◽  
João Gomes ◽  
Rui C. Martins
Keyword(s):  
Phenolic Compounds ◽  
Red Mud ◽  
Advanced Oxidation Processes ◽  
Heterogeneous Catalysts ◽  
Advanced Oxidation ◽  
Iron Sulfate ◽  
Toxicity Tests ◽  
Oxidation Processes ◽  
Toc Removal ◽  
Olive Mill

Wastewaters from the olive oil industry are a regional environmental problem. Their phenolic content provides inherent toxicity, which reduces the treatment potential of conventional biological systems. In this study, Sulfate Radical based Advanced Oxidation Processes (SRbAOPs) are compared with advanced oxidation processes (namely Fenton’s peroxidation) as a depuration alternative. Synthetic olive mill wastewaters were submitted to homogeneous and heterogeneous SRbAOPs using iron sulfate and solid catalysts (red mud and Fe-Ce-O) as the source of iron (II). The homogenous process was optimized by testing different pH values, as well as iron and persulfate loads. At the best conditions (pH 5, 300 mg/L of iron and 600 mg/L of persulfate), it was possible to achieve 39%, 63% and 37% COD, phenolic compounds and TOC removal, respectively. The catalytic potential of a waste (red mud) and a laboratory material (Fe-Ce-O) was tested using heterogenous SRbAOPs. The best performance was achieved by Fe-Ce-O, with an optimal load of 1600 mg/L. At these conditions, 27%, 55% and 5% COD, phenolic compounds and TOC removal were obtained, respectively. Toxicity tests on A. fischeri and L. sativum showed no improvements in toxicity from the treated solutions when compared with the original one. Thus, SRbAOPs use a suitable technology for synthetic OMW.

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