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Flux emergence in the solar active region NOAA 11158: the evolution of net current

Research in Astronomy and Astrophysics 2015年第9期15卷 1547-1558页

作者： Panditi Vemareddy Parameswaran Venkatakrishnan solipuram karthikreddy Indian Institute of Astrophysics Udaipur Solar Observatory Physical Research Laboratory Department of Earth and Space Sciences Indian Institute of Space Science and Technology

We present a detailed investigation of the evolution of observed net vertical current using a time series of vector magnetograms of the active region （AR） NOAA 11158 obtained from the Helioseismic and Magnetic Imager. We also discuss the relation of net current to the observed eruptive events. The AR evolved from the βγ to βγδ3 configuration over a period of six days. The AR had two sub-regions of activity with opposite chirality： one dominated by sunspot rotation producing a strong CME, and the other showing large shear motions producing a strong flare. The net current in each polarity over the CME producing sub-region increased to a maximum and then decreased when the sunspots were separated. The time profile of net current in this sub-region followed the time profile of the rotation rate of the south-polarity sunspot in the same sub-region. The net current in the flaring sub-region showed a sudden increase at the time of the strong flare and remained unchanged until the end of the observation, while the sunspots maintained their close proximity. The systematic evo- lution of the observed net current is seen to follow the time evolution of total length of strongly sheared polarity inversion lines in both of the sub-regions. The observed photospheric net current could be explained as an inevitable product of the emergence of a twisted flux rope, from a higher pressure confinement below the photosphere into the lower pressure environment of the photosphere.

关键词： Sun:active regions -- magnetic fields -- activity -- coronal mass ejec-tions -- non-potentiality -- electric current

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Effect of indigenous fungi on ochratoxin A produced by two species of Penicillium

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Animal Nutrition 2016年第3期2卷 225-228页

作者： Koteswara R.Vankudoth Aruna Boda Girisham Sivadevuni Madhusudhan R.solipuram Department of Microbiology Kakatiya University

Interaction between indigenous fungal strains in preventing ochratoxin A(OTA) production by Penicillium verrucosum and Penicillium nordicum was studied in 100 mL of Czapek yeast autolysate(CYA) medium in a 250-mL "U" shaped culture vessel in one end for 3 days. At the end of incubation period, test fungi inoculated and incubated at 27 ± 2℃ for another 14 days to study the inhibition of OTA production was estimated by high performance liquid chromatography(HPLC). Total inhibition of OTA production was recorded with Aspergillus fumigatus, Aspergillus flavus, Aspergillus niger, Aspergillus ustus, Fusarium culmorum, Fusarium graminarium, Fusarium proliferatum, Penicillium chrysogenum, Penicillium expansum and Trichoderma viridae. A significant correlation coefficient(r) on growth(0.493, P < 0.0003) and OTA production(0.785, P < 0.0001) was observed between the tested Penicillium species and other coexisting fungi. In conclusion, the present investigation revealed that those indigenous fungi are necessary to minimize potential losses to the poultry farmer and toxicological hazards to the consumer as biological control agent in different foods and feeds.

关键词： Poultry feed Indigenous fungi OTA Interaction "U" shaped culture vessel HPLC

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