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Effect of Storage Temperature on Vitamin C, Total Phenolics,UPLC Phenolic Acid Profile and Antioxidant Capacity of Eleven Potato(Solanum tuberosum) Varieties

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Horticultural Plant Journal 2017年第2期3卷 73-89页

作者： Joseph Hubert Yamdeu Galani Pooja M.Mankad Avadh K.Shah Nilesh J.Patel rajeshkumar r.acharya Jayant G.Talati Department of Agriculture and Veterinary Medicine Université des Montagnes Department of Biochemistry B.A. College of Agriculture Anand Agricultural University Main Vegetable research Station Anand Agricultural University

Storage of potato tubers at low temperature affects their metabolism and may alter their phytochemical properties. There is a need to elucidate the changes in antioxidant compounds, activity and enzymes during storage of tubers. Eleven Indian potato varieties were evaluated for antioxidant parameters, after 0, 30, 60 and 90 days of storage at room temperature, 15 °C and 4 °C. Total phenolics(0.0786–0.1546 mg gallic acid equivalents·g^(-1)FW) and vitamin C content(0.0828–0.2416 mg·g^(-1)FW) varied among the varieties and were different with storage temperature; their levels fluctuated during storage but remained above the initial level until the last day of observation. Phenolic acid profiling by UPLC identified 12 compounds among which the most abundant was chlorogenic acid followed by gallic acid, sinapic acid and ellagic acid. Except para-coumaric acid which decreased at 4 °C, all the phenolic acids increased with storage. Caffeic acid, chlorogenic acid, protocatechuic acid and gallic acid mostly correlated with total phenolic content(r = 0.456, 0.482, 0.588 and 0.620, respectively). Antioxidant activity against both DPPH and ABTS radicals increased during the initial days of storage and then dropped to a level comparable or lower than the original value,irrespective of the storage temperature. Correlation study revealed that chlorogenic acid, gallic acid and ferulic acid mostly contributed to antioxidant activity. Activity of both antioxidant enzymes, superoxide dismutase and ascorbate peroxidase, increased initially but then decreased to values lower than the initial level and were not influenced by storage temperature. Correlation with antioxidant activity indicated that the enhancement of reactive oxygen scavenging species in cold stored tubers could result mainly from ascorbate peroxidase activity. Our results demonstrate that storage temperature adversely influences the metabolism and the content of antioxidant compounds in potato tubers, with subsequent inc

关键词： potato cold storage UPLC phenolics vitamin C antioxidant

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Generation,bonding and reactivity of transient zinc-substituted silylenes

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Science China Chemistry 2024年第4期67卷 1256-1262页

作者： Cheng Xu Thayalan rajeshkumar Laurent Maron Xuebing Leng Yaofeng Chen State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China Spin-X Institute School of Chemistry and Chemical EngineeringState Key Laboratory of Luminescent Materials and DevicesGuangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsSouth China University of TechnologyGuangzhou 510641China LPCNO CNRS&INSAUniversitéPaul SabatierToulous 31077France

The metal-substituted silylenes are of high interest,as the theoretical studies indicated that the silylenes with electropositive substituents have a small ΔE_(S-T)(singlet-triplet energy gap)or even the ground-state ***,such compounds are highly unstable,and only two transient alkali metal-substituted silylenes M(^(t)Bu_(3)Si)Si:(M=Li,K)were generated by photoextrusion of the alkali metal-substituted silacyclopropenes and merely studied by spectroscopic method(EPr)at low temperature(14 to 50 K).Herein,we report the generation of transient zinc-substituted silylenes from zinc silacyclopropanyl complexes under very mild and convenient *** generated transient zinc-substituted silylenes are highly reactive and undergo intermolecular cycloaddition with alkenes for the synthesis of zinc-substituted Si-heterocyclic *** there is no substrate,the zinc-substituted silylenes attack the C-C bonds of the β-diketiminato ligands and break the C-C *** studies further highlight the silylene nature of the zinc-substituted silylene and a very small ΔE_(S-T)(4.4 kcal/mol).

关键词： zinc complex silylene C-C bond cleavage cycloaddition DFT calculations

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Secret Image Communication Scheme Based on Visual Cryptography and Tetrolet Tiling Patterns

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Computers, Materials & Continua 2020年第11期65卷 1283-1301页

作者： N.rajeshkumar DYuvaraj G.Manikandan r.BalaKrishnan B.Karthikeyan D.Narasimhanand N.r.raajan Srinivasa ramanujan Centre SASTRA Deemed UniversityKumbakonamTamil NaduIndia Department of Computer Science Cihan University-DuhokDuhokIraq School of Computing SASTRA Deemed UniversityThanjavurTamil NaduIndia School of EEE SASTRA Deemed UniversityThanjavurTamil NaduIndia

Visual cryptographic scheme is specially designed for secret image sharing in the form of shadow *** basic idea of visual cryptography is to construct two or more secret shares from the original image in the form of chaotic *** this paper,a novel secret image communication scheme based on visual cryptography and Tetrolet tiling patterns is *** proposed image communication scheme will break the secret image into more shadow images based on the Tetrolet tiling *** secret image is divided into 4×4 blocks of tetrominoes and employs the concept of visual cryptography to hide the secret *** main feature of the proposed scheme is the selection of random blocks to apply the tetrolet tilling patterns from the fundamental tetrolet pattern *** procedure is used to perform both tetrolet transform and the scheme of visual ***,the experimental results showcase the proposed scheme is an extraordinary approach to transfer the secret image and reconstruct the secret image with high visual quality in the receiver end.

关键词： Tetrominoes tile visual secret share image transmission security visual cryptography

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Synthesis, Characterization, Thermal Stability and Antibacterial Activity of Coumarin Based Methacrylate Copolymers

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Chinese Journal of Polymer Science 2014年第10期32卷 1373-1380页

作者： S. Venkatesan B. ranjithkumar S. rajeshkumar K. Anver Basha P.G. & research Department of Chemistry C. Abdul Hakeem College Hakeem Nagar Melvisharam-632509Tamil Nadu India Department of Biochemistry Adhiparasakthi College of Arts and Science Kalavai-632506 Vellore Dt TamilNadu India

Monomer of 7-methacryloyloxy-4-methylcoumarin （MAOMC） was synthesized and characterized by FTIr, 1H-NMr and 13C-NMr spectroscopy. Copolymers of MAOMC with butoxyethylmethacrylate （BOEMA） at different feed compositions were prepared by free radical solution polymerization at （70 ± 1） ℃ in ethylmethylketonc （EMK） using benzyl peroxide （BPO） as an initiator. The copolymers were characterized by FTIr and IH-NMr spectroscopy. Thermogravimetric analysis （TGA） and differential scanning calorimetry （DSC） of the copolymers showed moderate thermal stability and higher Tg values. Gel permeation chromatography （GPC） was used to find out the molecular weights of the different copolymers. Antibacterial activities of the copolymers were also investigated against the selected pathogenic bacteria＇s. The antibacterial activity of the copolymer increases as the MAOMC content increases in the copolymer. This shows that coumarin moiety plays a very important role in the antibacterial activity.

关键词： 7-Methacryloyloxy-4-methylcoumarin Copolymerization Thermogravimetric analysis Antibacterial activity

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Unusual selective reactivity of the rare-earth metal complexes bearing a ligand with multiple functionalities

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Science China Chemistry 2023年第1期66卷 117-126页

作者： Dongjing Hong Thayalan rajeshkumar Shan Zhu Zeming Huang Shuangliu Zhou Xiancui Zhu Laurent Maron Shaowu Wang Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China Anhui Laboratory of Clean Catalytic Engineering Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistiry and ApplicationCollege of Chemical and Environmental EngineeringAnhui Polytechnic UniversityWuhu 241000China LPCNO CNRS&INSAUniversite Paul Sabatier 135 Avenue de Rangueil31077 ToulouseFrance

Ligands play a key role in controlling activity of organometallic complexes so that development of new ligands to overcome the challenge is the main topic of modern *** first example of 1,1-hydride migratory insertion and intramolecular redox reaction has been realized in this work by applying a new ligand in rare-earth metal *** novel rare-earth metal complexes L^(Mes)rECH2TMS(THF)(rE=Y(1a),Dy(1b),Er(1c),Yb(1d),L^(Mes)=1-(3-(2,6-iPr_(2)C_(6)H_(3)N=CH)C8H4N)-CH_(2)CH_(2)-3-(2-CH2–4,6-Me_(2)C_(6)H_(2))-(N(CH)_(2)NC),THF=tetrahydrofuran)bearing a ligand with imino,indolyl,NHC(N-heterocyclic carbene)multiple functionalities were synthesized and *** of complexes 1 with silanes(PhSiH3or PhSiH2Me or PhSiD3)selectively produced the unprecedented 1,1-hydride(or deuterated H)migratory insertion of the indolyl moiety of the novel unsymmetrical dinuclear rare-earth metal complexes *** complex 2a reacts with Ph_(2)C=O to give the selective C=O double bond insertion to the rE–Co-methylene-Mesbond product 3a which further reacts with another Ph_(2)C=O(or DMAP,4-N,N-dimethylaminopyridine)affording the novelμ-η^(2):η^(3)-dianionic 3-iminoindolyl dinuclear rare-earth metal complex *** latter is formed through an unusual intramolecular redox reaction(through electron migration from the 2-carbanion of the indolyl ring to the imino motif)resulting in the re-aromatization of the indolyl ring.

关键词： rare-earth metal complexes indole N-heterocyclic carbene Fischer-type carbene 1 1-migratory insertion dianionic 3-iminoindolyl

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An Improved Multi-Objective Particle Swarm Optimization routing on MANET

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Computer Systems Science & Engineering 2023年第2期44卷 1187-1200页

作者： G.rajeshkumar M.Vinoth Kumar K.Sailaja Kumar Surbhi Bhatia Arwa Mashat Pankaj Dadheech Department of Computer Science and Engineering Erode Sengunthar Engineering CollegePerunduraiErode638057Tamil NaduIndia Department of Information Science and Engineering Dayananda Sagar Academy of Technology and ManagementBangalore560082India Department of Master of Computer Applications M.S.Ramaiah Institute of TechnologyBangalore560054India Department of Information Systems College of Computer Science and Information TechnologyKing Faisal UniversityRiyadh11533Saudi Arabia Faculty of Computing and Information Technology King Abdulaziz UniversityRabigh21911Saudi Arabia Department of Computer Science and Engineering Swami Keshvanand Institute of TechnologyManagement&GramothanJaipur302017RajasthanIndia

A Mobile Ad hoc Network(MANET)is a group of low-power con-sumption of wireless mobile nodes that conﬁgure a wireless network without the assistance of any existing infrastructure/centralized *** primary aim of MANETs is to extendﬂexibility into the self-directed,mobile,and wireless domain,in which a cluster of autonomous nodes forms a MANET routing *** Intrusion Detection System(IDS)is a tool that examines a network for mal-icious behavior/policy violations.A network monitoring system is often used to report/gather any suspicious attacks/*** IDS is a software program or hardware system that monitors network/security trafﬁc for malicious attacks,sending out alerts whenever it detects malicious *** impact of Dynamic Source routing(DSr)in MANETs challenging blackhole attack is investigated in this research *** Cluster Trust Adaptive Acknowledgement(CTAA)method is used to identify unauthorised and malfunctioning nodes in a MANET *** system is active and provides successful delivery of a data packet,which implements Kalman Filters(KF)to anticipate node ***,KF is used to eliminate synchronisation errors that arise during the sending and receiving *** order to provide an energy-efﬁcient solution and to minimize network trafﬁc,route optimization in MANET by using Multi-Objective Particle Swarm Optimization(MOPSO)technique to determine the optimal num-ber of clustered MANET along with energy dissipation in *** to the researchﬁndings,the proposed CTAA-MPSO achieves a Packet Delivery ratio(PDr)of 3.3%.In MANET,the PDr of CTAA-MPSO improves CTAA-PSO by 3.5%at 30%malware.

关键词： MANET intrusion detection system cluster kalmanﬁlter dynamic source routing multi-objective particle swarm optimization packet delivery ratio

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Correlation of Blood Lactate and Mixed Venous Oxygen Saturation in Off-Pump CABG

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World Journal of Cardiovascular Surgery 2014年第7期4卷 131-138页

作者： Ganapathy Sambandam Kamalakkannan ranjith Karthekeyan Mahesh Vakamudi Sandeep Bangale rajeshkumar Kodali Hemanand Nayagam Sushma Nandipati Department of Anesthesiology Sri Ramachandra Medical College and Research Institute Chennai India

Aim: To evaluate the correlation of blood lactate and mixed venous oxygen saturation to predict outcome in off-pump coronary artery bypass grafting. Method: This is a randomized study including 30 patients. Blood lactate and mixed venous oxygen saturation were measured in 4 groups of patients—number of grafts, presence or absence of left main coronary artery disease, ejection fraction and serum creatinine. Blood samples were taken before induction, after grafting, on intensive care unit admission, 24 hours and 48 hours after surgery. The measured blood lactate and mixed venous oxygen saturation are compared to assess the outcomes in terms of duration of ventilation and intensive care unit stay. results: The blood lactate and mixed venous oxygen saturation values increased post operatively but no statistically significant difference in three groups— number of grafts, left main coronary artery disease and ejection fraction. In serum creatinine group, the blood lactate value was found to be statistically significant after grafting in patients with creatinine r, there was a significant disparity in numbers. Conclusion: Mixed venous oxygen saturation is a better predictor of morbidity than blood lactate in terms of intensive care unit stay in patients undergoing off pump coronary artery bypass grafting.

关键词： Off-Pump Coronary Artery Bypass Grafting Blood Lactate Mixed Venous Oxygen Saturation Ejection Fraction Duration of Ventilation Duration of Intensive Care Unit Stay

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Complex TAPVC-Experience with Six Patients

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Surgical Science 2013年第11期4卷 509-515页

作者： Baskar ranjith Karthekeyan Periyasamy Thangavelu Jebaraj rethinasamy Mahesh Vakamudi Siva Muthukumar rajeshkumar Kodali Kamalakannan Sambandham Sushma Nandipati Sri ramachandra Medical College and research Institute Chennai India

Total anomalous pulmonary venous connection becomes a totally different subset when associated with complex congenital anomalies. The combination of two separate life-threatening congenital heart defects complicates the management of these patients. Six patients with total anomalous pulmonary venous connection associated with complex congenital heart disease were studied. There were 2 girls and 4 boys. Three of them were less than 5 kg in weight, and the other 3 were more than 5 kg in weight. Four patients had severe pulmonary arterial hypertension and 2 patients had pulmonary stenosis. Three patients had supracardiac type with a right vertical vein, one had drainage to the right atrium superior vena cava junction, one patient had supra cardiac type but split flow to both the superior vena cava and one patient had cardiac type. Three patients had double outlet right ventricle. Three patients had atrioventricular canal defect and 2 patients had preoperative pulmonary vein obstruction. All patients underwent rerouting of pulmonary veins. Concomitant procedures included intraventricular tunnel repair of ventricular septal defect and infundibular resection in double outlet right ventricle. Atrioventricular canal repair was done for rastelli type A atrioventricular canal. Superior vena caval plasty, atrioventricular canal repair and pulmonary artery banding were done in unbalanced atrioventricular septal defect and large double outlet right ventricle. Intracardiac repair through transatrial approach was done for tetralogy of Fallot. right ventricle-pulmonary artery conduit was done for truncus arteriosus. Single ventricle repair was done for corrected transposition of great arteries. There were 2 hospital deaths.

关键词： Total Anomalous AV Canal Complex Congenital Pulmonary Vein

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Oxygen Concentration during reperfusion in Mitral Valve Surgery

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World Journal of Cardiovascular Surgery 2013年第7期3卷 219-224页

作者： ranjith Karthekeyan Mahesh Vakamudi Sandeep Bangale rajeshkumar Kodali Kamalakannan Sambandham N. Hemanand Sushma Nandipati Soumya SrMC & rI—Sri ramachandra Medical College & research Institute Chennai India

Background: By lowering the oxygen fraction of the reperfusate, the reactive oxygen-derived free radicals can be reduced thus facilitating myocardial recovery during weaning from cardiopulmonary bypass and after surgery. Materials & Methods: Thirty patients undergoing mitral valve replacement were randomly exposed to an oxygen fraction of 0.7 (hyperoxic, n = 15) or 0.5 (normoxic, n = 15) during reperfusion. Hemodynamic variables, number of patients requiring additional inotropes and who developed new arrhythmia, duration of ventilation and intensive care unit stay, arterial blood gas and renal function were measured. results: The demographic data, duration of cardiopulmonary bypass, aortic cross clamp time, duration of mechanical ventilation, intensive care unit stay, additional inotropes, arrhythmia after reperfusion and renal function were similar in both groups. Arterial blood gas analysis was not significantly different, except for the low oxygen partial pressure in the normoxic group during reperfusion. With regard to hemodynamic variables, mean arterial pressure of the hyperoxic group was higher one hour after the cross clamp release. Hemodynamic variables were comparable in all other time periods. Conclusion: By reducing the oxygen concentration during reperfusion, the clinical outcomes in terms of inotropes usage, new arrhythmia after reperfusion, renal function, duration of ventilation and intensive care unit stay were not significantly altered.

关键词： Cardiopulmonary Bypass Normoxic Hyperoxic Oxygen reperfusion Free radicals

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Three Cases of ALCAPA with Associated Anomalies

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World Journal of Cardiovascular Surgery 2014年第1期4卷 1-6页

作者： Baskar ranjith Karthekeyan Periyasamy Thangavelu Jebaraj rethinasamy Mahesh Vakamudi Siva Muthukumar rajeshkumar Kodali Kamalakannan Sambandham Sushma Nandipati Department of Anesthesiology Sri Ramachandra Medical College and Research Institute No. 1 Ramachandra Nagar Porur Chennai India

There are several potential issues that affect the treatment and diagnostic pattern of anomalous left coronary artery arising from the pulmonary artery. We report three cases of infants who presented with anomalous left coronary artery arising from the pulmonary artery with severe left ventricular dysfunction and severe mitral regurgitation along with associated anomalies. One patient had congenital lobar emphysema of the right midde lobe. Another patient had left main stem bronchus compression, collapse of basal segments of left lower lobe and panlobular emphysema in medial basal segment of right lower lobe. The third patient had cleft lip and palate. All patients underwent successful repair. The hemodynamic stability was compromised when the infant with congenital lobar emphysema had spontaneous pneumothorax after extubation and she needed an intercostal drainage. The infant with lung collapse had to be reintubated on the second day since she became hypoxic due to recollapse of the lung once the airway positive pressure was removed. She needed chest physiotherapy, vigorous endotracheal suctioning and inhaled bronchodilator therapy. The patient who had cleft palate succumbed to aspiration pneumonitis in the postoperative period. Follow-up of other two patients after three months showed very good improvement in left ventricular systolic function.

关键词： Anomalous Coronary Artery Left Ventricle Mitral regurgitation

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