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Crystal Structure Analysis of N,N′-bis(3-chloro-2-methylsalicylidene)-1,4- butanediamine
P. Sharmila, R. Rajesh, R. Venkatesan2, Jagadeesan Ganapathy, and S. Aravindhan 조선대학교 기초과학연구원 2016 조선자연과학논문집 Vol.9 No.4
The crystal structure of the saliciline derivatives N,N′-bis(3-chloro-2-methylsalicylidene)-1,4-butanediamine (C20H22Cl2N2O2) has been determined from single crystal X-ray diffraction data. In the title compound crystallizes in the triclinic space group Pī with unit cell dimension a= 4.6085(3) Å, b=5.9747(3) Å and c= 5.9747(3) Å [α=83.889 (4)°, β= 86.744(5)° and γ= 82.085(5)°]. The title compound is essentially planar conformation. The compound lies across a crystallographic inversion centre and adopts E configurations with respect to the C-N bonds. The crystal packing of the molecules of compound is stabilized through weak O-H...N intra molecular interactions Keywords: Chromene; Schiff Base Ligand; Single Crystal Structure; X-ray Diffraction
Venkatesan Hemapriya,Mayakrishnan Prabakaran,Kandasamy Parameswari,Subramaniyan Chitra,김승현,정일민 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
The influence of two benzofused heterocyclic compounds, namely 2-phenylquinazolin-4(3H)-one(PQO)and 2-phenyl-4H-benzo[d]oxazin-4-one(POO) in controlling mild steel corrosion in 1 M H2SO4 solutionwas investigated using gravimetric and electrochemical methods. The experimental results revealedthat both the inhibitors inhibit corrosion and their inhibition efficiency follows the order PQO > POO. Amixed mode of inhibition from polarization and a charge transfer mechanism from impedance study inthe absence and presence of inhibitors were found. The passive film formed on the mild steel surface wascharacterized using SEM-EDX. Quantum chemical parameters derived using DFT performed at B3LYP/6-31G(d, p) level were used to correlate the molecular structure.
Venkatesan, A,Rathi, Servin,Lee, In-Yeal,Park, Jinwoo,Lim, Dongsuk,Kim, Gil-Ho,Kannan, E S Institute of Physics 2016 Semiconductor science and technology Vol.31 No.12
<P>In this paper, we have demonstrated a low temperature hydrogen (H<SUB>2</SUB>) sensor based on reduced graphene oxide (rGO) and tin oxide nanoflowers (SnO<SUB>2</SUB> NFs) hybrid composite film. The addition of SnO<SUB>2</SUB> NFs into rGO solution inhibits irreversible restacking and agglomeration of rGO and increases the active surface area for interaction with H<SUB>2</SUB>. This rGO-SnO<SUB>2</SUB> NFs hybrid film sensor showed an excellent response to H<SUB>2</SUB> at 60 °C at 200 ppm with an improvement of 126% compared to pure rGO which was used as a control sample. The sensor also showed good response and recovery time in comparison to pure rGO film. The highly improved H<SUB>2</SUB> sensing characteristics of rGO-SnO<SUB>2</SUB> NFs hybrid are due to its (a) unique structural geometry that increased the surface area for H<SUB>2</SUB> adsorption, and (b) change in the width of depletion layer at the interface due to H<SUB>2</SUB> interaction.</P>
Venkatesan, Thamizhiniyan,Jeong, Min-Ji,Choi, Young-Woong,Park, Eun-Jin,El-Desouky, Samy Korany,Kim, Young-Kyoon SAGE Publications 2016 Integrative cancer therapies Vol.15 No.4
<P>Although current chemotherapeutic agents are active at the beginning of therapy, the most common risk is the development of resistance during later stages in almost all cancer types including breast cancer. Hence, investigation of novel drugs is still a priority goal for cancer treatment. The objective of the present study is to investigate the anticancer effect of a derivative of stilbene, deoxyrhapontigenin (DR) isolated from <I>Rheum undulatum</I> L. root extracts against the chemoresistant MCF-7/adr and its parental MCF-7 human breast cancer cells. The morphological images indicate that DR induces an extensive cytoplasmic vacuolation in breast cancer cells. Mechanistic investigations revealed that DR treatment causes endoplasmic reticulum (ER) dilation and upregulated the expression of ER stress markers GRP78, IRE1α, eIF2α, CHOP, JNK, and p38. Subsequently, we also identified that DR increases the levels of apoptotic fragment of PARP (89 kDa) in breast cancer cells. Blocking the expression of one of the components of the ER stress–mediated apoptosis pathway, CHOP using siRNA significantly decreased DR-induced apoptotic cleavage of PARP. In summary, the present study suggests that the induction of ER stress–mediated apoptosis by DR may account for its cytotoxic effects in human breast cancer cells.</P>
Venkatesan, Ramu,Ji, Eunhee,Kim, Sun Yeou Hindawi Publishing Corporation 2015 BioMed research international Vol.2015 No.-
<P>Alzheimer's disease (AD), characterized by progressive dementia and deterioration of cognitive function, is an unsolved social and medical problem. Age, nutrition, and toxins are the most common causes of AD. However, currently no credible treatment is available for AD. Traditional herbs and phytochemicals may delay its onset and slow its progression and also allow recovery by targeting multiple pathological causes by antioxidative, anti-inflammatory, and antiamyloidogenic properties. They also regulate mitochondrial stress, apoptotic factors, free radical scavenging system, and neurotrophic factors. Neurotrophins such as BDNF, NGF, NT3, and NT4/5 play a vital role in neuronal and nonneuronal responses to AD. Neurotrophins depletion accelerates the progression of AD and therefore, replacing such neurotrophins may be a potential treatment for neurodegenerative disease. Here, we review the phytochemicals that mediate the signaling pathways involved in neuroprotection specifically neurotrophin-mediated activation of Trk receptors and members of p75<SUP>NTR</SUP> superfamily. We focus on representative phenolic derivatives, iridoid glycosides, terpenoids, alkaloids, and steroidal saponins as regulators of neurotrophin-mediated neuroprotection. Although these phytochemicals have attracted attention owing to their <I>in vitro</I> neurotrophin potentiating activity, their <I>in vivo</I> and clinical efficacy trials has yet to be established. Therefore, further research is necessary to prove the neuroprotective effects in preclinical models and in humans. </P>
Venkatesan Nithya,Rathinasamy Sakthivel,Faris Alzahrani,마용기 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.11
This paper investigates the problem of robust decentralized fault-tolerant resilient control for fractionalorder large-scale interconnected uncertain system, and the problem considered here is subject to mixed H∞ and passivity performance constraint, external disturbances, controller perturbations and control input saturation. Based on the Lyapunov approach, the sufficient conditions are derived in terms of linear matrix inequalities to ensure the asymptotic stabilization of the fractional-order large-scale system with a prespecified mixed H∞ and passivity performance index. The main objective of this work is to design a robust decentralized fault-tolerant resilient controller which compensates both actuator fault and input saturation in its design for obtaining the required result. Finally, a numerical example is included to illustrate the effectiveness of the designed control law. The simulation results reveal that our proposed controller not only can effectively deal with actuator faults, but also has very good robustness for input saturation and external disturbances.
A Prediction of Nutrition Water for Strawberry Production using Linear Regression
Venkatesan, Saravanakumar,Sathishkumar, VE,Park, Jangwoo,Shin, Changsun,Cho, Yongyun The Institute of Internet 2020 International journal of advanced smart convergenc Vol.9 No.1
It is very important to use appropriate nutrition water for crop growth in hydroponic farming facilities. However, in many cases, the supply of nutrition water is not designed with a precise plan, but is performed in a conventional manner. We proposes a forecasting technique for nutrition water requirements based on a data analysis for optimal strawberry production. To do this, the proposed forecasting technique uses linear regression for correlating strawberry production, soil condition, and environmental parameters with nutrition water demand for the actual two-stage strawberry production soil. Also, it includes predicting the optimal amount of nutrition water requires according to the heterogeneous cultivation environment and variety by comparing the amount of nutrition water needed for the growth and production of different kinds of strawberries. We suggested study uses two types of section beds that are compared to find out the best section bed production of strawberry growth. The dataset includes 233 samples collected from a real strawberry greenhouse, and the four predicted variables consist of the total amounts of nutrition water, average temperature, humidity, and CO<sub>2</sub> in the greenhouse.
Combination of Nano-Hydroxyapatite with Stem Cells for Bone Tissue Engineering
Venkatesan, Jayachandran,Lowe, Baboucarr,Anil, Sukumaran,Kim, Se-Kwon,Shim, Min Suk American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.9
<P>Tissue engineering seeks to exploit functional biomaterials and engineer them to serve as artificial templates that promote the regeneration of tissues and damaged organs. Engineered scaffold materials recapitulate the extracellular matrix and provide cells with information essential for tissue development. Nanotechnologies make use of the material at the nanoscale for targeted interactions at molecular levels and deliver biochemical cues for cell growth required for tissue formation. In bone tissue engineering, nano-hydroxyapatite (nHA), which is a calcium phosphate-based material, is extensively used as a bone defect substitute to mimic the natural bioceramic portion of bone. nHA can be functionalized in the form of composite scaffolds along with other polymers, ceramic, and growth factors to enable bone tissue regeneration. In addition, the material directs stem cell differentiation into specific lineages. This stem cell-based therapy is a prominent approach in organ development and tissue regeneration. Here, we examine nHA interactions with stem cells in the form of designed scaffolds and offer important considerations about the fundamental challenges and prospects for its application in bone tissue engineering.</P>
Venkatesan, A,Rathi, Servin,Lee, In-yeal,Park, Jinwoo,Lim, Dongsuk,Kang, Moonshik,Joh, Han-Ik,Kim, Gil-Ho,Kannan, E S IOP Pub 2017 Nanotechnology Vol.28 No.36
<P>In this work, we report on the hydrogen (H<SUB>2</SUB>) sensing behavior of reduced graphene oxide (RGO)/molybdenum disulfide (MoS<SUB>2</SUB>) nano particles (NPs) based composite film. The RGO/MoS<SUB>2</SUB> composite exhibited a highly enhanced H<SUB>2</SUB> response (∼15.6%) for 200 ppm at an operating temperature of 60 °C. Furthermore, the RGO/MoS<SUB>2</SUB> composite showed excellent selectivity to H<SUB>2</SUB> with respect to ammonia (NH<SUB>3</SUB>) and nitric oxide (NO) which are highly reactive gas species. The composite’s response to H<SUB>2</SUB> is 2.9 times higher than that of NH<SUB>3</SUB> whereas for NO it is 3.5. This highly improved H<SUB>2</SUB> sensing response and selectivity of RGO/MoS<SUB>2</SUB> at low operating temperatures were attributed to the structural integration of MoS<SUB>2</SUB> nanoparticles in the nanochannels and pores in the RGO layer.</P>