51
|
Raj kumar D, Rama Rao N, Muthu SE, Arumugam S, Raja MM, Suresh K. Effect of Fe on the Martensitic Transition, Magnetic and Magnetocaloric Properties in Ni-Mn-In Melt-spun Ribbons. DEFENCE SCI J 2016. [DOI: 10.14429/dsj.66.10215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effect of Fe on the martensitic transitions, magnetic and inverse magnetocaloric effect in Ni47Mn40-xFexIn13 ribbons (x = 1, 2, 3 and 5) has been investigated. All the ribbon compositions under study have shown the presence of austenite phase at room temperature. The variation of martensitic transition with the increase in Fe-content is non-monotonic. The thermal hysteresis of the martensitic transition increased with the increase in Fe-content. The martensitic transitions shifted to lower temperatures in the presence of high magnetic fields. A maximum magnetic entropy change (∆SM) of 50 Jkg-1K-1 has been achieved in the Ni47Mn38Fe2In13 (x = 1) ribbon at 282 K for an applied field of 5 T.
Collapse
|
52
|
Pogson E, Hansen C, Blake S, Arumugam S, Juresic J, Ochoa C, Yakobi J, Haman A, Trtovac A, Holloway L, Thwaites D. SU-D-201-01: A Multi-Institutional Study Quantifying the Impact of Simulated Linear Accelerator VMAT Errors for Nasopharynx. Med Phys 2016. [DOI: 10.1118/1.4955613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
53
|
Pogson EM, Hansen C, Blake S, Arumugam S, Holloway L, Thwaites D. SU-F-T-384: Step and Shoot IMRT, VMAT and Autoplan VMAT Nasopharnyx Plan Robustness to Linear Accelerator Delivery Errors. Med Phys 2016. [DOI: 10.1118/1.4956569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
54
|
De Leon J, Rivest-Henault D, Keats S, Jameson M, Rai R, Arumugam S, Wilton L, Ngo D, Martin J, Sidhom M, Holloway L. PV-0328: Rectal immobilisation device in stereotactic prostate treatment: intrafraction motion and dosimetry. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)31577-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
55
|
Begg J, Holloway L, Liney G, Dong B, Alnaghy S, Causer T, AlHarthi T, George A, Goozee G, Vial P, Arumugam S, Glaubes L, Whelan B, Oborn B, Metcalfe P, Thwaites D, Keall P. PO-0951: Radiation beam alignment and baseline dosimetry measurements for the Australian MRI-linac program. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32201-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
56
|
Paramasivan V, Arumugam S, Kameswaran M. Role of hyoid advancement in addressing lateral hypopharyngeal wall collapse in obstructive sleep apnea. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
57
|
Beeksma B, Truant D, Holloway L, Arumugam S. An assessment of image distortion and CT number accuracy within a wide-bore CT extended field of view. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2015; 38:255-61. [PMID: 26048719 DOI: 10.1007/s13246-015-0353-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2014] [Accepted: 05/29/2015] [Indexed: 11/29/2022]
Abstract
Although wide bore computed tomography (CT) scanners provide increased space for patients, the scan field of view (sFOV) remains considerably smaller than the bore size. Consequently, patient anatomy which spans beyond the sFOV is truncated and the information is lost. As a solution, some manufacturers provide the capacity to reconstruct CT images from a partial dataset at an extended field of view (eFOV). To assess spatial distortion within this eFOV three phantoms were considered a 30 × 30 × 20 cm(3) slab of solid water, the Gammex electron density CT phantom and a female anthropomorphic phantom. For each phantom, scans were taken centrally within the sFOV as a reference image and with the phantom edge extended at 1 cm intervals from 0 to 5 cm beyond the sFOV into the eFOV. To assess CT number accuracy various tissue equivalent materials were scanned in the eFOV and resulting CT numbers were compared to inserts scanned within the sFOV. For all phantom geometries, objects within the eFOV were geometrically overestimated with elongation of phantom shapes into the eFOV. The percentage increase in size ranged from 0.22 to 15.94 % over all phantoms considered. The difference between eFOV and sFOV CT numbers was dependent upon insert density. The eFOV underestimated CT numbers in the range of -127 to -230 HU for soft tissue densities and -278 to -640 for bone densities. This trend reversed for low tissue densities with the CT numbers in the eFOV being overestimated by 100-130 HU for lung equivalent inserts. Initial correlation between eFOV and sFOV CT numbers was seen and a correction function was successfully applied to better estimate the CT number representative of that seen within the sFOV.
Collapse
|
58
|
Arumugam S, Xing A, Young T, Blake S, Thwaites D, Holloway L. SU-F-BRB-09: Measurement Based Dose-Volume Metrics for the Quality Assurance of VMAT Plans-Are We There Yet? Med Phys 2015. [DOI: 10.1118/1.4925204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
59
|
Arumugam S, Xing A, Vial P, Thwaites D, Holloway L. SU-E-T-76: A Software System to Monitor VMAT Plan Complexity in a Large Radiotherapy Centre. Med Phys 2015. [DOI: 10.1118/1.4924437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
60
|
Blake S, Arumugam S, Holloway L, Vinod S, Ochoa C, Phan P, Thwaites D. EP-1442: Investigating the impact of treatment delivery uncertainties for lung SABR: a pilot study. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41434-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
61
|
Zeynali H, Akbari H, Arumugam S. Size control synthesis and high coercivity L10-FePt nanoparticles produced by iron (III) acetylacetonate salt. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.08.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
62
|
Afrin R, Arumugam S, Soetikno V, Thandavarayan RA, Pitchaimani V, Karuppagounder V, Sreedhar R, Harima M, Suzuki H, Miyashita S, Nomoto M, Suzuki K, Watanabe K. Curcumin ameliorates streptozotocin-induced liver damage through modulation of endoplasmic reticulum stress-mediated apoptosis in diabetic rats. Free Radic Res 2015; 49:279-89. [PMID: 25536420 PMCID: PMC4389763 DOI: 10.3109/10715762.2014.999674] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We investigated the effect of curcumin on liver injury in diabetic rats induced by streptozotocin (STZ) through modulation of endoplasmic reticulum stress (ERS) and unfolded protein response (UPR). Experimental diabetes was induced by a single intraperitoneal injection of STZ (55 mg/kg), and curcumin was given at 100 mg/kg by gavage for 56 days. We observed that curcumin improved the morphological and histopathological changes, significantly decreased hepatic ERS marker protein: glucose-regulated protein 78, and improved liver function in diabetic rats. Moreover, treatment with curcumin markedly decreased the sub-arm of the UPR signaling protein such as phospho-double-stranded RNA-dependent protein kinase-like ER kinase, CCAAT/enhancer-binding protein homologous protein, tumor necrosis factor receptor-associated factor 2, and inositol-requiring enzyme1α; and inhibited tumor necrosis factor α, interleukin 1β, phospho-p38 mitogen-activated protein kinase, and apoptosis signal-regulating kinase 1 in liver tissues of diabetic rats. Apoptotic and anti-apoptotic signaling proteins, such as cleaved caspase-3 and B-cell lymphoma 2, were significantly increased and decreased, respectively in diabetic rats; curcumin treatment prevented all of these alterations. In summary, our results indicate that curcumin has the potential to protect the diabetic liver by modulating hepatic ERS-mediated apoptosis, and provides a novel therapeutic strategy for the diabetic liver damage.
Collapse
|
63
|
Jaganathan V, Arumugam S. Powdery Mildew Disease Identification in Karpoori Variety of Betel vine Plants Using Histogram Based Techniques. ACTA ACUST UNITED AC 2014. [DOI: 10.14738/aivp.25.478] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
64
|
Xing A, Deshpande S, Arumugam S, George A, Holloway L, Goozee G. SU-E-T-503: Development of a Software Tool for Verification of Delivered Tomotherapy Plans Using the Tomo Log File. Med Phys 2014. [DOI: 10.1118/1.4888836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
65
|
Xing A, Arumugam S, Deshpande S, George A, Holloway L, Vial P, Goozee G. SU-E-T-407: Evaluation of Four Commercial Dosimetry Systems for Routine Patient-Specific Tomotherapy Delivery Quality Assurance. Med Phys 2014. [DOI: 10.1118/1.4888740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
66
|
Yuvaraj S, Kalai Selvan R, Kumar VB, Perelshtein I, Gedanken A, Isakkimuthu S, Arumugam S. Sonochemical synthesis, structural, magnetic and grain size dependent electrical properties of NdVO4 nanoparticles. ULTRASONICS SONOCHEMISTRY 2014; 21:599-605. [PMID: 24090832 DOI: 10.1016/j.ultsonch.2013.08.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 08/07/2013] [Accepted: 08/26/2013] [Indexed: 06/02/2023]
Abstract
NdVO4 nanoparticles are successfully synthesized by efficient sonochemical method using two different structural directing agents like CTAB and P123. The phase formation and functional group analysis are carried out using X-ray diffraction (XRD) and fourier transform infra red (FT-IR) spectra, respectively. Using Scherrer equation the calculated grain sizes are 27 nm, 24 nm and 20 nm corresponding to NdVO4 synthesized by without surfactant, with CTAB and P123, respectively. The TEM images revealed that the shape of NdVO4 particles is rice-like and rod shaped particles while using CTAB and P123 as surfactants. The growth mechanism of NdVO4 nanoparticles is elucidated with the aid of TEM analysis. From electrical analysis, the conductivity of NdVO4 nanoparticles synthesized without surfactant showed a higher conductivity of 5.5703 × 10(-6) S cm(-1). The conductivity of the material depends on grain size and increased with increase in grain size due to the grain size effect. The magnetic measurements indicated the paramagnetic behavior of NdVO4 nanoparticles.
Collapse
|
67
|
Garcera A, Bahi N, Periyakaruppiah A, Arumugam S, Soler RM. Survival motor neuron protein reduction deregulates autophagy in spinal cord motoneurons in vitro. Cell Death Dis 2013; 4:e686. [PMID: 23788043 PMCID: PMC3702296 DOI: 10.1038/cddis.2013.209] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Spinal muscular atrophy (SMA) is a genetic disorder characterized by degeneration of spinal cord motoneurons (MNs), resulting in muscular atrophy and weakness. SMA is caused by mutations in the Survival Motor Neuron 1 (SMN1) gene and decreased SMN protein. SMN is ubiquitously expressed and has a general role in the assembly of small nuclear ribonucleoproteins and pre-mRNA splicing requirements. SMN reduction causes neurite degeneration and cell death without classical apoptotic features, but the direct events leading to SMN degeneration in SMA are still unknown. Autophagy is a conserved lysosomal protein degradation pathway whose precise roles in neurodegenerative diseases remain largely unknown. In particular, it is unclear whether autophagosome accumulation is protective or destructive, but the accumulation of autophagosomes in the neuritic beadings observed in several neurite degeneration models suggests a close relationship between the autophagic process and neurite collapse. In the present work, we describe an increase in the levels of the autophagy markers including autophagosomes, Beclin1 and light chain (LC)3-II proteins in cultured mouse spinal cord MNs from two SMA cellular models, suggesting an upregulation of the autophagy process in Smn (murine survival motor neuron protein)-reduced MNs. Overexpression of Bcl-xL counteracts LC3-II increase, contributing to the hypothesis that the protective role of Bcl-xL observed in some SMA models may be mediated by its role in autophagy inhibition. Our in vitro experimental data indicate an upregulation in the autophagy process and autophagosome accumulation in the pathogenesis of SMA, thus providing a valuable clue in understanding the mechanisms of axonal degeneration and a possible therapeutic target in the treatment of SMA.
Collapse
|
68
|
Arumugam S, Young T, Xing A, Holloway L. TU-C-108-09: What VMAT Delivery Errors Can Be Detected with Commercial Dosimetric Systems? - A Comparison of Three Dosimetric Systems. Med Phys 2013. [DOI: 10.1118/1.4815373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
69
|
Gray A, Bawazeer O, Arumugam S, Vial P, Thwaites D, Holloway L. SU-E-T-375: Evaluation of the Ability of Three Commercially Available Dosimeters to Detect Systematic Delivery Errors in IMRT Plans. Med Phys 2013. [DOI: 10.1118/1.4814809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
70
|
Sagayee GMA, Arumugam S, Mala GA. Biometric encryption using enhanced finger print image and elliptic curve. INTERNATIONAL JOURNAL OF ELECTRONIC SECURITY AND DIGITAL FORENSICS 2013. [DOI: 10.1504/ijesdf.2013.055049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
71
|
Sambandam B, Muthu SE, Arumugam S, Manoharan PT. Coexistence of antiferromagnetism and ferromagnetism in Mn2+/CdS nanocrystals and their photophysical properties. RSC Adv 2013. [DOI: 10.1039/c3ra22177f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
72
|
Singh S, Rawat R, Muthu SE, D'Souza SW, Suard E, Senyshyn A, Banik S, Rajput P, Bhardwaj S, Awasthi AM, Ranjan R, Arumugam S, Schlagel DL, Lograsso TA, Chakrabarti A, Barman SR. Spin-valve-like magnetoresistance in Mn2NiGa at room temperature. PHYSICAL REVIEW LETTERS 2012; 109:246601. [PMID: 23368355 DOI: 10.1103/physrevlett.109.246601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Indexed: 06/01/2023]
Abstract
Spin valves have revolutionized the field of magnetic recording and memory devices. Spin valves are generally realized in thin film heterostructures, where two ferromagnetic (FM) layers are separated by a nonmagnetic conducting layer. Here, we demonstrate spin-valve-like magnetoresistance at room temperature in a bulk ferrimagnetic material that exhibits a magnetic shape memory effect. The origin of this unexpected behavior in Mn(2)NiGa has been investigated by neutron diffraction, magnetization, and ab initio theoretical calculations. The refinement of the neutron diffraction pattern shows the presence of antisite disorder where about 13% of the Ga sites are occupied by Mn atoms. On the basis of the magnetic structure obtained from neutron diffraction and theoretical calculations, we establish that these antisite defects cause the formation of FM nanoclusters with parallel alignment of Mn spin moments in a Mn(2)NiGa bulk lattice that has antiparallel Mn spin moments. The direction of the Mn moments in the soft FM cluster reverses with the external magnetic field. This causes a rotation or tilt in the antiparallel Mn moments at the cluster-lattice interface resulting in the observed asymmetry in magnetoresistance.
Collapse
|
73
|
Senthilkumar J, Chandrasekaran M, Suresh Y, Arumugam S, Mohanraj V. Advertisement timeout driven bee's mating approach to maintain fair energy level in sensor networks. Appl Soft Comput 2012. [DOI: 10.1016/j.asoc.2012.04.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
74
|
Arumugam S, Xing A, Goozee G, Holloway L. EP-1509 ON THE SENSITIVITY OF PROSTATE RADIOTHERAPY TREATMENTS TO RANDOM UNCERTAINTIES; A COMPARISON OF TECHNIQUES. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71842-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
75
|
Thiyagarajan R, Manivannan N, Arumugam S, Esakki Muthu S, Tamilselvan NR, Sekar C, Yoshino H, Murata K, Apostu MO, Suryanarayanan R, Revcolevschi A. Pressure-induced colossal piezoresistance effect and the collapse of the polaronic state in the bilayer manganite (La(0.4)Pr(0.6))(1.2)Sr(1.8)Mn2O7. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:136002. [PMID: 22392884 DOI: 10.1088/0953-8984/24/13/136002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have investigated the effect of hydrostatic pressure as a function of temperature on the resistivity of a single crystal of the bilayer manganite (La(0.4)Pr(0.6))(1.2)Sr(1.8)Mn(2)O(7). Whereas a strong insulating behaviour is observed at all temperatures at ambient pressure, a clear transition into a metallic-like behaviour is induced when the sample is subjected to a pressure (P) of ~1.0 GPa at T < 70 K. A huge negative piezoresistance ~10(6) in the low temperature region at moderate pressures is observed. When the pressure is increased further (5.5 GPa), the high temperature polaronic state disappears and a metallic behaviour is observed. The insulator to metal transition temperature exponentially increases with pressure and the distinct peak in the resistivity that is observed at 1.0 GPa almost vanishes for P > 7.0 GPa. A modification in the orbital occupation of the e(g) electron between 3d(x(2)-y(2)) and 3d(z(2)-r(2)) states, as proposed earlier, leading to a ferromagnetic double-exchange phenomenon, can qualitatively account for our data.
Collapse
|