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Chandra, Ram
- Geodynamic Significance of the Updated Statherian-Calymmian (at C. 1.65 and 1.46 Ga) Palaeomagnetic Results from Mafic Dykes of the Indian Shield
Abstract Views :205 |
PDF Views:91
Authors
Affiliations
1 National Centre for Earth Science Studies, Thiruvananthapuram 695 031, IN
2 Centre of Excellence in Geology, Institute of Earth Science, Bundelkhand University, Jhansi 284 128, IN
1 National Centre for Earth Science Studies, Thiruvananthapuram 695 031, IN
2 Centre of Excellence in Geology, Institute of Earth Science, Bundelkhand University, Jhansi 284 128, IN
Source
Current Science, Vol 112, No 04 (2017), Pagination: 811-822Abstract
A reassessment of the recent palaeomagnetic data on Proterozoic mafic dykes in the Bundelkhand and Bastar cratons permits a robust estimate of 1.466 Ga (Calymmian) pole (λ = 49.4°N; Φ; = 132.9°E; A95 = 6.6°; N = 11) for the Indian shield. The pole corresponds to a mean direction of D = 40.5°; I = 56.4° (α95 = 5.5°; K = 70). The Indian pole at c. 1.65 Ga (Statherian) is suggested to have been situated at λ = 59.6°N and Φ = 47.9°E (A95 = 8.1°; N = 6); it is estimated from a mean direction of D = 336.4°; I = 66.0°N (α95 = 5.3°; K = 159). The 1.466-Ga-old dykes are confined to the Eastern Ghats orogenic front in the easternmost part of the Bastar craton. Geochemically, the shoshonitic/high-K calc-alkaline affinity of these dykes is uniquely distinct from the tholeiitic composition found in Mesoor Palaeoproterozoic dykes in other parts of the Indian shield. Testing the existing pre-Rodinia Mesoproterozoic tectonic reconstructions negates the Columbia reconstructions in which the Indian shield is shown in juxtaposition with North China/Laurentia. On the other hand, palaeomagnetic and geological data suggest that the linkages between the Indian shield and Western Australia proposed earlier for the Palaeoproterozoic appear to persist during the Mesoproterozoic as well. The linkages may be further extended into Baltica.Keywords
Geodynamics, Mafic Dykes, Orogenic Belts, Palaeomagnetism, Tectonic Reconstructions.Full Text
- Effect of Different Essential Oils on Enzymatic Activity of Oyster Mushroom (Pleurotus florida)
Abstract Views :170 |
PDF Views:82
Authors
Manjari
1,
Ram Chandra
1
Affiliations
1 Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 121, No 10 (2021), Pagination: 1357-1360Abstract
An experiment was carried out to study the effect of different essential oils on enzymatic activity of stored oyster mushroom (Pleurotus florida). The harvested fruiting body was treated with four essential oils, i.e. lemongrass oil, citronella oil, mint oil and clove oil at two different concentrations – 5 and 10 μl – to test the total phenol content (TPC) and activity of three important enzymes, viz. phenylalanine ammonia lyase (PAL), peroxidase (POD) and polyphenol oxidase (PPO) that are involved in post-harvest quality preservation of mushrooms. TPC (0.286 mg/g), PAL content (0.038 μM/g), PPO content (0.042 U/mg) and POD content (0.38 U/mg) were found significant in mint oiltreated mushroom at 10 μl concentration. TPC and PAL content were higher in essential oil-treated mushrooms compared to the control samples, whereas PPO and POD contents were lower in the treated samples, signifying that essential oils treatment had a positive impact on the quality of harvested mushrooms. This preservative technique will help in increasing the shelf-life of harvested fruiting bodies.Keywords
>Enzymes, Essential Oils, Fruiting Bodies, Pleurotus florida, Preservation.Full Text
References
- Wakachaure, G. C., Mushrooms – cultivation, marketing and consumption: postharvest handling of fresh mushrooms, Directorate of Mushroom Research, Indian Council of Agriculture Research, Solan, India, 2011, pp. 197–206.
- Ippolito, A. and Nigro, F., Natural antimicrobials for preserving fresh fruit and vegetables. In Improving the Safety of Fresh Fruit and Vegetables, Woodhead Publishing, Swaston, UK, 2005, pp. 513–555.
- Sharifi-Rad, J. et al., Biological activities of essential oils: from plant chemoecology to traditional healing systems. Molecules, 2017, 22(1), 70.
- Gao, M., Feng, L. and Jiang, T., Browning inhibition and quality preservation of button mushroom (Agaricus bisporus) by essential oils fumigation treatment. Food Chem., 2014, 149, 107–113.
- Adhikari, H. S. and Jha, S. K., Postharvest microbial contamination in oyster mushroom and their management using plant essential oils. Bio. Bull., 2017, 3(1), 104–108.
- Tanhaş, E., Martin, E., Korucu, E. N. and Dirmenci, T., Effect of aqueous extract, hydrosol, and essential oil forms of some endemic Origanum L. (Lamiaceae) taxa on polyphenol oxidase activity in fresh‐cut mushroom samples. J. Food Process. Preserv., 2020, 44(10), 14726.
- Zheng, H. and Lu, H., Use of kinetic, Weibull and PLSR models to predict the retention of ascorbic acid, total phenols and antioxidant activity during storage of pasteurized pineapple juice. LWT – Food Sci. Technol., 2011, 44(5), 1273–1281.
- Bergmeyer, H. U., Determination with glucose oxidase and peroxidase. Methods of Enzymatic Analysis, 1974, pp. 1205–1215.
- Wang, J. and Constabel, C. P., Polyphenol oxidase overexpression in transgenic Populus enhances resistance to herbivory by forest tent caterpillar (Malacosoma disstria). Planta, 2004, 220(1), 87– 96.
- Havir, E. A., Phenylalanine ammonia-lyase from soybean cell suspension cultures. Methods Enzymol., 1987, 142, 248–253.
- Gao, M., Feng, L. and Jiang, T., Browning inhibition and quality preservation of button mushroom (Agaricus bisporus) by essential oils fumigation treatment. Food Chem., 2014, 149, 107–113.
- Qu, T., Li, B., Huang, X., Li, X., Ding, Y., Chen, J. and Tang, X., Effect of peppermint oil on the storage quality of white button mushrooms (Agaricus bisporus). Food Bioprocess Technol., 2020, 13(3), 404–418.