scholarly journals Fluoranthene induced changes in photosynthetic pigments, biochemical compounds and enzymatic activities in two microalgal species: Chlorella vulgaris Beijerinck and Desmodesmus subspicatus Chodat

2014 ◽  
Vol 3 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Miral Patel ◽  
JI Nirmal Kumar ◽  
KK Tiwari
Keyword(s):  
Chlorella Vulgaris ◽  
Photosynthetic Pigments ◽  
Photosynthetic Pigment ◽  
Enzymatic Activities ◽  
Variable Amount ◽  
Biochemical Compounds ◽  
Desmodesmus Subspicatus ◽  
Metabolic Activities ◽  
Induced Changes ◽  
Microalgal Species

The photosynthetic pigments, biochemical and enzymatic activities in two freshwater microalgal species, Chlorella vulgaris and Desmodesmus subspicatus at different fluoranthene concentrations were compared with the control conditions. During 16-days of incubation period when treated with fluoranthene, both microalgal species exhibited variable amount of photosynthetic pigment, biochemical compounds and enzymatic activities. The addition of fluoranthene at concentrations ranged from 1.5 mg l-1; to 10 mg l-1; to microalgal cultures led to changes in all different metabolites but the patterns varied from species to species. Among the two species tested, pigment, biochemical and enzymatic contents were remarkably declined from 7 % to 95% in C. vulgaris. Moreover, all metabolites in D. subspicatus also diminishing significantly by 3% to 88% of fluoranthene doses (10ppm). These results suggest that fluoranthene-induced changes of pigments, biochemical and enzymatic variations in test microalgae, D. subspicatus and C. vulgaris, might reveal its resistance and ability to metabolize PAHs. At the same time, the PAH impact changes on different metabolic activities were higher at 12 and 16 days than at 4 and 8 days in treated microalgae. DOI: http://dx.doi.org/10.3126/ije.v3i1.9941 International Journal of Environment Vol.3(1) 2014: 41-55

scholarly journals Alteration of photosynthetic pigments and antioxidant systems in tomato under drought with Tebuconazole and Hexaconazole applications

2017 ◽  
Vol 1 ◽  
pp. 146
Author(s):  
Maruthaiya Arivalagan ◽  
Ramamurthy Somasundaram
Keyword(s):  
Drought Stress ◽  
Photosynthetic Pigments ◽  
Antioxidant Defense ◽  
Photosynthetic Pigment ◽  
Antioxidant Defense System ◽  
Antioxidant Systems ◽  
Defense System ◽  
Antioxidant Enzymes Activities ◽  
Effects Of Drought ◽  
Pigment Variation

Present investigation was focused on the response and regulation of the antioxidant defense system and photosynthetic pigment variation effect of two important fungicides or plant growth regulators Hexaconazole (HEX) and Tebuconazole (TBZ) on drought stressed tomato (Lycopersicon esculentum Mill.) plants. Drought stress was imposed for 30 Days after sowing (DAS) of tomato plant. The water was irrigated by 4 Days Interval Drought (DID) and the control plants were regularly irrigated. Triazole treatment like HEX at 15 mg L-1 and TBZ at 10 mg L-1 imposed on 30, 40 and 50 DAS. The plant samples were collected on 40, 50 and 60 DAS. The photosynthetic pigments like chlorophyll – a, chlorophyll – b and total chlorophyll were estimated. The drought stress reduced the photosynthetic pigments and increased the antioxidant contents and antioxidant enzymes activities. The combined drought stress with triazole treatments increased the photosynthetic pigments then reduced the ascorbic acid (AA), α-tocopherol, catalase (CAT), peroxidase (POX) and superoxide dismutase (SOD) activities, when compared to drought stressed plants. It can be concluded that the triazole treatment partially mitigated the adverse effects of drought stress in L. esculentum.

scholarly journals Evolution of Microbial Composition and Enzymatic Activities during the Composting of Textile Waste

2020 ◽  
Vol 10 (11) ◽  
pp. 3758
Author(s):  
Saloua Biyada ◽  
Mohammed Merzouki ◽  
Taisija Dėmčėnko ◽  
Dovilė Vasiliauskienė ◽  
Jaunius Urbonavičius ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Enzymatic Activities ◽  
Green Paper ◽  
Microbial Composition ◽  
Textile Waste ◽  
Phosphatase Activities ◽  
Nutritional Conditions ◽  
Mature Compost ◽  
Metabolic Activities ◽  
Next Generation Sequencing Ngs

The production of stable and mature compost often depends on the performance of microbes and their enzymatic activity. Environmental and nutritional conditions influence the characteristics of microbial communities and, therefore, the dynamics of major metabolic activities. Using three waste mixtures (textile waste mixed with either green, paper, or cardboard waste), the maturity of the compost produced was assessed by following the physico-chemical parameters and enzymatic activities provided by the microorganisms that were identified using next-generation sequencing (NGS). Among the three mixtures used, it was found that the two best mixtures showed C/N ratios of 16.30 and 16.96, total nitrogen of 1.37 and 1.39%, cellulase activities of 50.62 and 52.67 Ug−1, acid phosphatase activities of 38.81 and 68.77 Ug−1, and alkaline phosphatase activities of 51.12 and 56.86 Ug−1. In addition, several lignocellulosic species, together with those that are able to solubilize phosphate, were identified. Among those known for cellulase and acid/alkaline phosphatase activities, bacteria belonging to the Proteobacteria, Bacteroidetes, Actinobacteria, and Firmicutes phyla were shown. The presence of species belonging to the Ascomycota and Basidiomycota phyla of Fungi, which are known for their ability to produce cellulase and acid/alkaline phosphatases, was demonstrated. These findings provide a basis for the production of stable and mature compost based on textile waste.

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