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Jeya, Marimuthu,Kim, Tae-Su,Kumar Tiwari, Manish,Li, Jinglin,Zhao, Huimin,Lee, Jung-Kul The Royal Society of Chemistry 2012 Molecular bioSystems Vol.8 No.12
<P>A novel type III polyketide synthase (RePKS) from <I>Rhizobium etli</I> produced a heptaketide pyrone using acetyl-CoA and six molecules of malonyl-CoA. Its catalytic efficiency (<I>k</I><SUB>cat</SUB>/<I>K</I><SUB>m</SUB> = 5230 mM<SUP>−1</SUP> min<SUP>−1</SUP>) for malonyl CoA was found to be the highest ever reported. Molecular dynamics studies revealed the unique features of RePKS.</P> <P>Graphic Abstract</P><P>A novel type III polyketide synthase (RePKS) from <I>Rhizobium etli</I> produced a heptaketide pyrone using acetyl-CoA and six molecules of malonyl-CoA. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2mb25347j'> </P>
S. Jeya Shobana,B. Paramasivan 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.7
Congestion in Wireless Sensor Networks (WSN) get worse when there are multiple and random flows of data in which some have superior significance over the others requiring fidelity in terms of packet delivery, QoS, energy efficiency and throughput. In node-level, congestion leads to impairment of packets that obviously reduces the QoS. In this paper, we present a Cluster based congestion control with Rate Adjustment based on Priority (CRAP) protocol, which self-organizes the sensor nodes into clusters. These clusters monitor congestion in a proactive manner within its confined range which exchanges information among them and adjusts the traffic rate when one cluster has high priority flow over the other. This rate adjustment is based on the exchange of traffic rate estimate among the clusters that reduces packet re-transmissions and energy loss. Our simulation expedites system wide rate control resulting in good throughput, very low packet loss probability and delay that deals with multiple, random flows of data.
S. Jeya Shobana,B. Paramasivan 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.2
Congestion in Wireless Sensor Networks (WSN) get worse when there are multiple and random flows of data in which some have superior significance over the others requiring fidelity in terms of packet delivery, QoS, energy efficiency and throughput. In node-level, congestion leads to impairment of packets that obviously reduces the QoS. In this paper, we present a Cluster based congestion control with Rate Adjustment based on Priority (CRAP) protocol, which self-organizes the sensor nodes into clusters. These clusters monitor congestion in a proactive manner within its confined range which exchanges information among them and adjusts the traffic rate when one cluster has high priority flow over the other. This rate adjustment is based on the exchange of traffic rate estimate among the clusters that reduces packet re-transmissions and energy loss. Our simulation expedites system wide rate control resulting in good throughput, very low packet loss probability and delay that deals with multiple, random flows of data.
M. Jeya,S. Thiagarajan,이정걸,P. Gunasekaran 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.1
Xylanases randomly clear the backbone of xylans, which are hemicelluloses representing a considerable source of fixed carbon in nature. Consequently, these enzymes have important industrial applications. To characterize the genes responsible for producing these enzymes, we cloned xylanase genes belonging to the GH11 and GH10 families from Aspergillus versicolor MKU3 using a 2-step polymerase chain reaction (PCR) protocol involving degenerate PCR and genome-walking PCR (GWPCR). We amplified a family 10 xylanase consensus fragment using degenerate PCR primers exhibiting specificity for conserved motifs within fungal family 10 xylanase genes. We identified a single family 10 xylanase gene (xynv10) and determined its entire gene sequence during the second step of GWPCR, which was used to amplify genomic DNA fragments upstream and downstream of xynv10. The xynv10 sequence contains a 1,378-bp open reading frame separated by 8 introns with an average size of 49 bp. We also amplified a partial GH11 xylanase gene sequence (xynv11) using degenerate PCR and genome-walking methods. Amplification of the C-terminal region of xynv11 using a degenerate primer designed from sequences revealed strong homology with the partial GH11 xylanase gene of A. versicolor MKU3. The structural region in xynv11 was approximately 680 bp and has one intron that is approximately 64 bp in length. Further expression and characterization of these genes will give better understanding of the role of these genes in xylan degradation by A. versicolor.
Effects of mullite gel on the properties of alumina castables
Simon Jeya Sunder Raj,S. Manisha Vidyavathy 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The bauxite-based refractory castables are made up of well-graded bauxite aggregate, binding matrix, and a sufficient amountof water. There are four mullite samples with various percentages of sol such as 2%,5%,7% and 10% were added to thealumina castables compositions. The conventional castables processing is carried out and after heat treatment the resultantproduct is characterized. Prepared castables are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy(SEM) and Differential scanning calorimetry (DSC) to obtain the structural properties, morphology, and thermal analysis,respectively. Enhanced properties were obtained for the mullite samples with 5% and 7% sols. Considerably improved flexuralstrength, modulus of rupture (MOR) and pH levels are obtained for the mullite gel composition but with a relatively lowerlevel of permanent linear change (PLC). Great refractory properties were achieved after sintering at 1300 oC due to thepresence of mullite in the bond phase with very slight CaO. This enables their use in various refractory applications such asin steel ladles, furnaces, kilns, incinerators, and reactors.
Kumar Jeya-Vijaya,Kumari B.D.Ranjitha The Korean Society of Plant Biotechnology 2005 Plant molecular biology and biotechnology research Vol.7 No.3
In the present study, in vitro multiple shoot induction was achieved from cotyledonary node and stem nodal explants of cv. NARI-6 of safflower (Carthamus tinctorius L.). Among various growth regulators tested, MS salts and B5 vitamins supplemented with BA (6-Benzy-laminopurine) $17.76\;{\mu}M$ and KN (Kinetin) $6.96\;{\mu}M$ phytohormonal combination was found to be the most effective in initiating numerous shoot buds after 30 days of culture than BA ($4.44-44.39\;{\mu}M$) or KN ($2.32-46.40\;{\mu}M$) alone in the medium. In addition, 0.8% (w/v) agar (Hi-media) and 3.0% sucrose (w/v) was the optimum level for the formation of adventitious shoots. Further results showed the maximum shoot elongation occurred on MS medium with BA ($8.88\;{\mu}M$) and $GA_3$($11.56\;{\mu}M$) combinations. Efficient rooting occurred on quarter strength MS medium with NAA $10.74\;{\mu}M$. The regenerated plantlets were acclimatized and successfully transferred to the field.
Prabhu, Ponnandy,Jeya, Marimuthu,Lee, Jung-Kul American Society for Microbiology 2010 Applied and environmental microbiology Vol.76 No.5
<B>ABSTRACT</B><P><I>Bacillus licheniformis</I>l-arabinose isomerase (l-AI) is distinguished from other l-AIs by its high degree of substrate specificity for l-arabinose and its high turnover rate. A systematic strategy that included a sequence alignment-based first screening of residues and a homology model-based second screening, followed by site-directed mutagenesis to alter individual screened residues, was used to study the molecular determinants for the catalytic efficiency of <I>B. licheniformis</I>l-AI. One conserved amino acid, Y333, in the substrate binding pocket of the wild-type <I>B. licheniformis</I>l-AI was identified as an important residue affecting the catalytic efficiency of <I>B. licheniformis</I>l-AI. Further insights into the function of residue Y333 were obtained by replacing it with other aromatic, nonpolar hydrophobic amino acids or polar amino acids. Replacing Y333 with the aromatic amino acid Phe did not alter catalytic efficiency toward l-arabinose. In contrast, the activities of mutants containing a hydrophobic amino acid (Ala, Val, or Leu) at position 333 decreased as the size of the hydrophobic side chain of the amino acid decreased. However, mutants containing hydrophilic and charged amino acids, such as Asp, Glu, and Lys, showed almost no activity with l-arabinose. These data and a molecular dynamics simulation suggest that Y333 is involved in the catalytic efficiency of <I>B. licheniformis</I>l-AI.</P>