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Antioxidant and Antimicrobial Activity of Cissus quadrangularis L.
G.A. Ravishankar,K.N. Chidambara Murthy,A. Vanitha,M. Mahadeva Swamy 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.2
Extracts of Cissus quadrangularis L. were tested for antioxidant activity by b-carotene linoleicacid model and also by 1,1-diphenyl-2-picrylhydrazyl model. The ethyl acetate fraction ofboth fresh and dry stem extracts at a concentration of 100 pm showed 64.8% antioxidant ac-tivity in the b-carotene linoleic acid system and 61.6% in the 1,1-diphenyl-2-picrylhydrazylsystem. This fraction showed the presence of sterols, vitamin C, and tanins as phytocon-stituents. The antioxidant activity of methanol extract and aqueous extract were comparativelyless significant than that of ethyl acetate extract, and n-hexane extract showed the least ac-tivity. The ethyl acetate extract and methanol extract of both fresh and dry stems further ex-hibited antimicrobial activity against Gram-positive bacteria, including Bacillus subtilis,Bacillus cereus, Staphylococcus aureus , and Streptococcus species. The results of the studyhave implications in the use of C. quadrangularis as an antibacterial agent and more so as anantioxidant in several aplications requiring these properties.9
ON THE SERIES EXPANSION OF THE RAMANUJAN'S CONTINUED FRACTION OF ORDER SIX
C. ADIGA,A. Vanitha,M. S. Surekha 장전수학회 2015 Proceedings of the Jangjeon mathematical society Vol.18 No.3
We give 3- and 6-dissections of Ramanujan's continued fraction of order six and its reciprocal. We also give combinatorial interpretations of the coefficients in the series expansions of the Ramanujan's continued fraction of order six and its reciprocal. These combinatorial results enable us to determine the signs of the coefficients.
Sujitha D.,Kumar H. G. Jalendra,Thapliayal Garima,Pal Garima,Vanitha P. A.,Uttarkar Akshay,Patil Mahesh,Reddy B. H. Rajashekar,Niranjan Vidya,Rayalcheruvu Usha,Govind Geetha,Udayakumar M.,Vemanna Ramu 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.6
Reactive oxygen species (ROS) increases under stress and damages cellular processes leading to decrease in productivity. Many genes have been known to be involved in scavenging ROS. We report the identification of master regulators of oxidative stress responsive genes from contrasting rice genotypes. Using microarray analysis, we identified 52 differentially expressed transcription factors (TFs) from the contrasting rice genotypes under oxidative stress. Upregulation of these TFs induces the expression of many genes in resistant or sensitive genotypes. The promoters of these TFs are enriched with reactive oxygen species binding elements (ROSE). The promoter analysis of genes that respond to oxidative stress also revealed that these TF binding sites were present and that these genes expressed differently in contrasting rice genotypes. The transcript levels of TFs correlate with expression level of stress responsive genes coding for various pathways such as polyol, ABA, JA biosynthesis and signaling. Functional validation of HSF-C1a using virus-induced gene silencing (VIGS), showed reduced expression of its target genes. Our study demonstrates that identified TFs could act as major transcriptional regulators of oxidative stress tolerance. These TFs can be used as markers and are potential candidates to improve stress tolerance in plants.