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Nanocomposite ZnO–SnO <sub>2</sub> Nanofibers Synthesized by Electrospinning Method
Asokan, Kandasami,Park, JaeYoung,Choi, Sun-Woo,Kim, Sang Sub Springer 2010 NANOSCALE RESEARCH LETTERS Vol.5 No.4
<P>We report the characterization of mixed oxides nanocomposite nanofibers of (1 − <I>x</I>) ZnO-(<I>x</I>)SnO<SUB>2</SUB> (<I>x</I> ≤ 0.45) synthesized by electrospinning technique. The diameter of calcined nanofibers depends on Sn content. Other phases like SnO, ZnSnO<SUB>3</SUB>, and Zn<SUB>2</SUB>SnO<SUB>4</SUB> were absent. Photoluminescence studies show that there is a change in the blue/violet luminescence confirming the presence of Sn in Zn-rich composition. Present study shows that the crystalline nanocomposite nanofibers with stoichiometry of (1 − <I>x</I>)ZnO-(<I>x</I>)SnO<SUB>2</SUB> (<I>x</I> ≤ 0.45) stabilize after the calcination and possess some morphological and optical properties that strongly depend on Sn content.</P>
R. Asokan,K. B. REBIJITH,H. H. RANJITHA,H. K. ROOPA,V.V. Ramamurthy 한국곤충학회 2013 Entomological Research Vol.43 No.4
MicroRNAs (miRNAs) are a family of small, endogenously initiated non‐coding RNAs that extensively regulate gene expression either by mRNA cleavage or by translational repression, thus playing important roles in the development and physiology of organisms. Experimental identification and characterization of spatially and temporally expressed miRNAs is a monumental task in insects such as the brown plant hopper, Nilaparvata lugens, a major pest of rice and also a vector of Tenuivirus. At this juncture bioinformatics approaches, which primarily depend on sequence homology and secondary structure verification, will be an invaluable tool. A total of nine novel miRNAs were identified in N. lugens using the computational approaches from 1 13 718 Expressed Sequence Tags. The phylogenetic analysis was carried out to compare their level of conservation with respect to other members of the animal kingdom. The functional annotation of these newly identified miRNAs revealed that the majority of them are involved in the transcription regulatory activity and signal transduction pathways. These regulatory impacts are promising towards insect pest management but need further experimental validation and functional analyses. Thus, the outcome of this study will help to carry out the gene knockdown and transgenesis studies for the functional analysis of the newly identified miRNA‐regulated phenotypes in N. lugens.
Shibu Marthandam Asokan,Tsu-Han Hung,Wen-Dee Chiang,Wan-Teng Lin 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.3
Obesity is generally associated with low-grade chronic inflammation that involves the recruitment of macrophages and other inflammation factors to the adipocytes of obese individuals. Tumor necrosis factor-alpha (TNF-α), a cytokine associated with systemic inflammation, is elevated in conditions of obesity. TNF-α is an important factor that plays an important role in skeletal muscle wasting. Apoptosis of myonuclei contributes to the loss of muscle mass and therefore plays an important role in skeletal muscle atrophy. In mouse models that were fed a high fat diet (HFD), a lipolysis-stimulating peptide-VHVV (purified from hydrolysate resulting from flavourzyme treatment of soy protein) was found to reduce HFD-related apoptotic effects in mice skeletal muscle and potentially control atrophy. HFD fed mice had heavier body weight than those fed with normal chow, and VHVV administration restricted lipid accumulation in muscle tissues of mice fed with HFD but increased nutrient uptake. Moreover, specific concentrations of VHVV regulated TNF-α expression that was elevated by HFD, suppressed apoptosis-related proteins and regulated the proteins of lipid metabolism.
Sudhagar, P,Asokan, K,Jung, June Hyuk,Lee, Yong-Gun,Park, Suil,Kang, Yong Soo Springer 2011 NANOSCALE RESEARCH LETTERS Vol.6 No.1
<P>A compact TiO<SUB>2</SUB> layer (~1.1 μm) prepared by electrostatic spray deposition (ESD) and swift heavy ion beam (SHI) irradiation using oxygen ions onto a fluorinated tin oxide (FTO) conducting substrate showed enhancement of photovoltaic performance in dye-sensitized solar cells (DSSCs). The short circuit current density (J<SUB>sc</SUB> = 12.2 mA cm<SUP>-2</SUP>) of DSSCs was found to increase significantly when an ESD technique was applied for fabrication of the TiO<SUB>2</SUB> blocking layer, compared to a conventional spin-coated layer (J<SUB>sc</SUB> = 8.9 mA cm<SUP>-2</SUP>). When SHI irradiation of oxygen ions of fluence 1 × 10<SUP>13</SUP> ions/cm<SUP>2</SUP> was carried out on the ESD TiO<SUB>2</SUB>, it was found that the energy conversion efficiency improved mainly due to the increase in open circuit voltage of DSSCs. This increased energy conversion efficiency seems to be associated with improved electronic energy transfer by increasing the densification of the blocking layer and improving the adhesion between the blocking layer and the FTO substrate. The adhesion results from instantaneous local melting of the TiO<SUB>2</SUB> particles. An increase in the electron transport from the blocking layer may also retard the electron recombination process due to the oxidized species present in the electrolyte. These findings from novel treatments using ESD and SHI irradiation techniques may provide a new tool to improve the photovoltaic performance of DSSCs.</P>
N-Ion-implanted TiO2 photoanodes in quantum dot-sensitized solar cells
Sudhagar, P.,Asokan, K.,Ito, E.,Kang, Yong Soo The Royal Society of Chemistry 2012 Nanoscale Vol.4 No.7
<P>Hierarchical nanostructured titanium dioxide (TiO(2)) clumps were fabricated using electrostatic spray with subsequent nitrogen-ion doping by an ion-implantation technique for improvement of energy conversion efficiency for quantum dot-sensitized solar cells (QDSCs). CdSe quantum dots were directly assembled on the produced N-ion-implanted TiO(2) photoanodes by chemical bath deposition, and their photovoltaic performance was evaluated in a polysulfide electrolyte with a Pt counter electrode. We found that the photovoltaic performance of TiO(2) electrodes was improved by nearly 145% upon N-ion implantation. The efficiency improvement seems to be due to (1) the enhancement of electron transport through the TiO(2) layer by inter-particle necking of primary TiO(2) particles and (2) an increase in the recombination resistance at TiO(2)/QD/electrolyte interfaces by healing the surface states or managing the oxygen vacancies upon N-ion doping. Therefore, N-ion-doped photoanodes offer a viable pathway to develop more efficient QD or dye-sensitized solar cells.</P>
H.M. Mahadeva Swamy,Asokan Ramasamy,C.M. Kalleshwaraswamy,S.K. Adarsh 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3
malnad and coastal areas. White grubs are the most important pests on this crop and cause considerable yield loss. Surveys were conducted to record species that are infested with white grubs of Karnataka and Kerala states. Three species of white grubs were collected and described using morphological and molecular characters. A detailed study of male genitalial structures such as aedeagus and endophallus in three species of Leucopholis Dejean, 1833 (Coleoptera: Scarabaeidae: Melolonthinae) viz., Leucopholis lepidophora Blanchard, 1850, Leucopholis burmeisteri Brenske, 1894 and Leucopholis coneophora Burmeister, 1855 showed substantial differences. The mitochondrial cytochrome oxidase subunit I gene was sequenced for molecular identification and phylogenetic analysis in this respect. L. lepidophora, L. burmeisteri and L. coneophora species were successfully identified by employing COXI gene. Phylogenetic analyses revealed that the COXI DNA barcode fragment of Leucopholis species and out-group taxa, available in genetic databases, confirms the species identity.
A non-linear tracking control scheme for an under-actuated autonomous underwater robotic vehicle
Mohan, Santhakumar,Thondiyath, Asokan Korean Society of Ocean Engineers 2011 International journal of ocean system engineering Vol.1 No.3
This paper proposes a model based trajectory tracking control scheme for under-actuated underwater robotic vehicles. The difficulty in stabilizing a non-linear system using smooth static state feedback law means that the design of a feedback controller for an under-actuated system is somewhat challenging. A necessary condition for the asymptotic stability of an under-actuated vehicle about a single equilibrium is that its gravitational field has nonzero elements corresponding to non-actuated dynamics. To overcome this condition, we propose a continuous time-varying control law based on the direct estimation of vehicle dynamic variables such as inertia, damping and Coriolis & centripetal terms. This can work satisfactorily under commonly encountered uncertainties such as an ocean current and parameter variations. The proposed control law cancels the non-linearities in the vehicle dynamics by introducing non-linear elements in the input side. Knowledge of the bounds on uncertain terms is not required and it is conceptually simple and easy to implement. The controller parameter values are designed using the Taguchi robust design approach and the control law is verified analytically to be robust under uncertainties, including external disturbances and current. A comparison of the controller performance with that of a linear proportional-integral-derivative (PID) controller and sliding mode controller are also provided.