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Krishna Nath,이춘환,Susheel Kumar,Roshan Sharma Poudyal,양영남,Rupak Timilsina,박유신,Jayamati Nath,Puneet Singh Chauhan,Bijaya Pant 한국유전학회 2014 Genes & Genomics Vol.36 No.1
Superoxide dismutase (SOD) isoenzymes areessential for scavenging excess reactive oxygen species inliving organisms. So far, expression pattern of SOD isoenzymesgenes along leaf development plus their sub-cellularlocalization and physical interaction network have notyet been clearly elucidated. Using multiple bioinformaticstools, we predicted the sub-cellular localizations of SODisoforms and described their physical interactions in rice. Using in silico approaches, we obtained several evidencesfor existence of seven SOD genes and a SOD copperchaperone gene. Their transcripts were differentiallyexpressed along with different developmental stage of riceleaf. Finally, we performed quantitative real time-polymerasechain reaction (qRT-PCR) to validate in silico differential expression pattern of SOD genes experimentally. Expression of two cytosolic cCuZn-SODs was highduring the whole vegetative stage. Two plastidic Fe-SODswere found and their expression levels were very low andstarted to increase from the late vegetative stage. Theirexpression patterns were very similar to each other, indicatingthe formation of heterodimer. However, theirexpression patterns are different from those for ArabidopsisFe-SODs. The expression of pCuZn-SOD was very high inthe early developmental stage, but qRT-PCR results weredifferent, which remains for further study. From the resultson the differential expression of SOD genes, we canunderstand the role of each SOD gene and even predicttheir role under certain circumstances based on in silicoanalysis.
Nath, Krishna,Elizabeth, John,Poudyal, Roshan Sharma,Ko, Su Yeon,Lim, Woon Ki,Lee, Choon-Hwan Korean Society of Photoscience 2013 Rapid communication in photoscience Vol.2 No.1
The photosystem II (PSII) light harvesting complex (LHC) consists of a variety of pigment protein complexes which are involved in structural organization and regulation of photosynthetic unit. These LHC proteins encoded by a group of Lhcb genes are essential for the structural integrity of PSII supercomplex, the channeling the excitation energy to the reaction center of PSII and its redistribution to photosystem I by state transitions. Numerous studies with the help of recent technological advancements have enabled a significant progress in our understanding on the structure of PSII-LHCII supercomplexes and their mobilization under various light conditions. Here, we present a mini-review on the latest concepts and models depicting the structure of PSII-LHCII supercomplexes and the role of Lhcb proteins in their supra-molecular organization. Also we will review on the current understandings and remaining problems involved in the mobilization of the supercomplexes during state transitions and during high light illumination for controlling light energy distribution between the two photosystems.
Sanath Krishna Muliya,Anukul Nath,Gandla Chethan Kumar,Avinash Visvanathan,Melvin Selvan,Raghuram Gowda,Vishal Santra,Abhijit Das 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.2
Delineating species distribution comprising information on habitat suitability is vital for developingconservation strategies. Like many other snake species, Lycodon flavicollis is a poorly studied peninsularIndian endemic species known only from few locality records. We used MaxEnt following the smallsampling approach to determine the probable distribution of the species. We found that the majority ofthe predicted area falls under Deccan Peninsular (Central Plateau and Deccan South) region of Indiafollowed by parts of Western Ghats. Isothermality and mean temperature of wettest quarter hadconsiderable influence on the predicted distribution range of the species. The findings of the presentwork show that our modelling approach may help in identifying new areas where this species may occur. We discussed the usefulness of this approach in determining potential distribution of data deficientspecies such as L. flavicollis. Additionally, we have also provided significant information on morphologyand natural history to enrich our current knowledge on the species.
BINAYAK NATH,KRISHNA PADA DAS 한국산업응용수학회 2018 Journal of the Korean Society for Industrial and A Vol.22 No.3
The paper explores a tri-trophic food chain model with density dependent mortality of intermediate predator. To analyze this aspect, we have worked out the local stability of different equilibrium points. We have also derived the conditions for global stability of interior equilibrium point and conditions for persistence of model system. To observe the global behaviour of the system, we performed extensive numerical simulations. Our simulation results reveal that chaotic dynamics is produced for increasing value of half-saturation constant. We have also observed trajectory motions around different equilibrium points. It is noticed that chaotic dynamics has been controlled by increasing value of density dependent mortality parameter. So,weconcludethatthedensitydependentmortalityparametercanbeusedtocontrol chaotic dynamics. We also applied basic tools of nonlinear dynamics such as Poincare section and Lyapunov exponent to investigate chaotic behaviour of the system.
Li, Jinjie,Pandeya, Devendra,Nath, Krishna,Zulfugarov, Ismayil S.,Yoo, Soo-Cheul,Zhang, Haitao,Yoo, Jeong-Hoon,Cho, Sung-Hwan,Koh, Hee-Jong,Kim, Do-Soon,Seo, Hak Soo,Kang, Byoung-Cheorl,Lee, Choon-Hwa Blackwell Publishing Ltd 2010 The Plant journal Vol.62 No.4
<P>Summary</P><P>The <I>zebra-necrosis</I> (<I>zn</I>) mutant of rice (<I>Oryza sativa</I>) produces transversely green/yellow-striped leaves. The mutant phenotype is formed by unequal impairment of chloroplast biogenesis before emergence from the leaf sheath under alternate light/dark or high/low temperatures (restrictive), but not under constant light and temperature (permissive) conditions. Map-based cloning revealed that <I>ZN</I> encodes a thylakoid-bound protein of unknown function. Virus-induced gene silencing of a <I>ZN</I> homolog in <I>Nicotiana benthamiana</I> causes leaf variegation with sporadic green/yellow sectors, indicating that ZN is essential for chloroplast biogenesis during early leaf development. Necrotic lesions often occur in the yellow sectors as a result of an excessive accumulation of reactive oxygen species (ROS). The phenotypic severity (leaf variegation and necrosis) and ROS levels are positively correlated with an increase in light intensity under restrictive conditions. In the mutant leaves, chlorophyll (Chl) metabolism, ROS scavenging activities, maximum quantum yield of photosystem II (PSII), and structures and functions of the photosynthetic complexes are normal in the Chl-containing cells, suggesting that ROS are mainly generated from the defective plastids of the Chl-free cells. The PSII activity of normal chloroplasts is hypersensitive to photoinhibition because the recovery rates of PSII are much slower. In the PSII repair, the degradation of damaged D1 is not impaired, suggesting a reduced activity of new D1 synthesis, possibly because of higher levels of ROS generated from the Chl-free cells by excess light. Together, we propose that ZN is required for protecting developing chloroplasts, especially during the assembly of thylakoid protein complexes, from incidental light after darkness.</P>
Tiwari, Jitendra N.,Kemp, Kingsley Christian,Nath, Krishna,Tiwari, Rajanish N.,Nam, Hong-Gil,Kim, Kwang S. American Chemical Society 2013 ACS NANO Vol.7 No.10
<P>Controlling the morphology and size of platinum nanodendrites (PtDs) is a key factor in improving their catalytic activity and stability. Here, we report the synthesis of PtDs on genomic-double-stranded-DNA/reduced-graphene-oxide (gdsDNA/rGO) by the NaBH<SUB>4</SUB> reduction of H<SUB>2</SUB>PtCl<SUB>6</SUB> in the presence of plant gdsDNA. Compared to industrially adopted catalysts (<I>i.e.</I>, state-of-the-art Pt/C catalyst, Pt/rGO, Pt<SUB>3</SUB>Co, <I>etc.</I>), the as-synthesized PtDs/gdsDNA/rGO hybrid displays very high oxygen reduction reaction (ORR) catalytic activities (much higher than the 2015 U.S. Department of Energy (DOE) target values), which are the rate-determining steps in electrochemical energy devices, in terms of onset-potential, half-wave potential, specific-activity, mass-activity, stability, and durability. Moreover, the hybrid exhibits a highly stable mass activity for the ORR over a wide pH range of 1–13. These exceptional properties would make the hybrid applicable in next-generation electrochemical energy devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-10/nn4038404/production/images/medium/nn-2013-038404_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4038404'>ACS Electronic Supporting Info</A></P>
Arsenic Exposure and Haematological Derangement in Cervical Cancer Cases in India
Kumar, Rahul,Trivedi, Vinita,Murti, Krishna,Dey, Akalanka,Singh, Jitendra Kumar,Nath, A,Das, P Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Cervical cancer is the second most common gynecological malignancy worldwide. According to HPV Information Centre, Spain (Aug'2014), in India approximately 1,22,844 women are diagnosed with the disease every year and of them 67,477 die due to the disease. CaCx is said to be mediated by HPV but recent data published reveal the role of Oxidative Stress in different Cancers. Arsenic is also one of the agents for causing Oxidative Stress. Arsenic has been linked with different types of cancer. Arsenic is considered responsible for generation of free radicals and eventually for apoptosis. Early diagnosis of CaCx is presently a matter of concern and clinical presentation in advanced stages become difficult for complete clinical response. For determination of oxidative stress, Malondialdehyde (MDA) was taken as an identifier and arsenic estimation was performed with the help of Atomic Absorption Spectrometer (AAS). RBC count and Haemoglobin levels were performed according to standard protocol. MDA was in direct proportion with arsenic concentration and inversely proportional to RBC and Haemoglobin in CaCx patients. Arsenic is one of the major causative agents for oxidative stress and hence may be a risk factor leading to cancer including CaCx.
Zulfugarov Ismayil S.,Mishra Sujata R.,Han, Ok-Kyung,Safarova Rena B.,Nath Krishna,Lee, Choon-Hwan Korean Society of Photoscience 2005 Journal of Photosciences Vol.12 No.3
Plants dissipate excess excitation energy from their photosynthetic apparatus by a process called non-photochemical quenching (NPQ). The major part of NPQ is energy dependent quenching (qE) which is dependent on the thylakoid pH and regulated by xanthophyll cycle carotenoids associated with photosystem (PS) II of higher plants. The acidification of the lumen leads to protonation and thus conformational change of light harvesting complex (LHC) proteins as well as PsbS protein of PSII, which results in the induction of qE. Although physiological importance of qE has been well established, the mechanistic understanding is rather insufficient. However, recent finding of crystal structure of LHCII trimer and identification of qE mutants in higher plants and algae enrich and sharpen our understanding of this process. This review summarizes our current knowledge on the qE mechanism. The nature of quenching sites and components involved in this process, and their contribution and interaction for the generation of qE appeared in the proposed models for the qE mechanism are discussed.