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Dutta, Sudhir K.,Agrawal, Kireet,Girotra, Mohit,Fleisher, A. Steven,Motevalli, Mahnaz,Mah'moud, Mitchell A.,Nair, Padmanabhan P. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Introduction: Epidemiological studies suggest a protective role for ${\beta}$-carotene with several malignancies. Esophageal adenocarcinoma frequently arises from Barrett's esophagus (BE). We postulated that ${\beta}$-carotene therapy maybe protective in BE. Materials and Method: We conducted a prospective study in which 25 mg of ${\beta}$-carotene was administered daily for six-months to six patients. Each patient underwent upper endoscopy before and after therapy and multiple mucosal biopsies were obtained. Additionally, patients completed a gastroesophageal reflux disease (GERD) symptoms questionnaire before and after therapy and severity score was calculated. To study the effect of ${\beta}$-carotene at molecular level, tissue extracts of the esophageal mucosal biopsy were subjected to assessment of heat-shock protein 70 (HSP70). Results: A significant (p<0.05) reduction in mean GERD symptoms severity score from $7.0{\pm}2.4$ to $2.7{\pm}1.7$ following ${\beta}$-carotene therapy was noted. Measurement of Barrett's segment also revealed a significant reduction in mean length after therapy. In fact, two patients had complete disappearance of intestinal metaplasia. Furthermore, marked enhancement of HSP70 expression was demonstrated in biopsy specimens from Barrett's epithelium in four cases that were tested. Conclusions: Long-term ${\beta}$-carotene therapy realizes amelioration of GERD symptoms along with restitution of the histological and molecular changes in esophageal mucosa of patients with BE, associated with concurrent increase in mucosal HSP70 expression.
The effect of sliding wear parameters on carburized AISI1040 steel
A. Arulbrittoraj,P. Padmanabhan,M. Duraiselvam,R. Srinivasan,G. Ebenezer 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
This study aims to investigate the effect of wear parameters and wear behavior on gas carburized AISI1040 steel. Scanning electron microscope images reveal that carburizing has been observed for a depth of 393 ± 23 µm from the surface. The Vickers microhardness test has been conducted on the cross section of the sample, which has a maximum hardness of 423 ± 18 HV near the surface and 220 ± 15 HV near the interface. The pin-on-disk apparatus has been employed to investigate sliding wear performance by varying the applied load and sliding distance. The applied load, sliding distance, and temperature of the steel pin are selected as the wear parameters, which affect the wear resistance and friction behavior. After the investigation, the sliding distance is determined to be a significant parameter, followed by the applied load and temperature of the steel pin.
G. Shanmugavelayutham,V. Selvarajan,P.V.A. Padmanabhan,K.P. Sreekumar,N.K. Joshi 한국물리학회 2007 Current Applied Physics Vol.7 No.2
A DC non-transferred mode plasma spray torch was fabricated for plasma spheroidization. The eect of powder-carrier gas and pow-der loading on the temperature of the plasma jet generated by the torch has been studied. The experiment was done at dierent inputparticles in the size range from 40 to 100l m were processed. The temperature of the jet was estimated after owing powder-carrier gasonly into the plasma jet and with powder-carrier gas feeding powder into the ame. On introduction of powder-carrier gas and powderloading the temperature of the jet was found to decrease appreciably down to 11%. The temperature of the plasma jet was estimatedusing the Atomic Boltzmann plot method.
R. Srinivasan,D. Vasudevan,P. Padmanabhan 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7
This paper presents the development of predictive models for bend force and final bend angle (after springback) in air bending of electrogalvanized steel sheet employing response surface methodology. The models are developed based on five-level half factorial central composite design of experiments with strain hardening exponent, coating thickness, die opening, die radius, punch radius, punch travel,punch velocity as input parameters and bend force and final bend angle as responses. The results obtained from the models are in good accord with the experimental results. The effects of individual parameters and their interactions on the responses have also been analyzed in this study.
In-flight particle behaviour and its effect on co-spraying of alumina?titania
G. Shanmugavelayutham,V. Selvarajan,T.K. Thiyagarajan,P.V.A. Padmanabhan,K.P. Sreekumar,R.U. Satpute Y. Zhai 한국물리학회 2006 Current Applied Physics Vol.6 No.1
The present paper investigate and illustrate the importance of plasmaparticle interaction in controlling the plasma spray processwhile spraying aluminatitania powder blend. Plasma sprayed coatings of aluminatitania (6040l m) have been prepared at dier-chemical composition of aluminatitania coatings, prepared at low input power, is signicantly dierent from that of the feed stockpowder. Coating composition progressively approaches that of the feedstock powder at higher power inputs. Experimental resultsare explained in terms of the in-ight behaviour of alumina and titania particles in the plasma jet using a one-dimensional model topredict the thermal state of the particles. In particular, the eect of particle size and input power are considered in this study.
Sudhir K Dutta,Sandeep Verma,Vardhmaan Jain,Balarama K Surapaneni,Rakesh Vinayek,Laila Phillips,Padmanabhan P Nair 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.3
2 decades evidence has emerged to suggest that inflammation-derived oxidative damage and cytokine induced toxicity may play asignificant role in the neuronal damage associated with Parkinson’s disease (PD). Presence of pro-inflammatory cytokines and T cellinfiltration has been observed in the brain parenchyma of patients with PD. Furthermore, evidence for inflammatory changes hasbeen reported in the enteric nervous system, the vagus nerve branches and glial cells. The presence of α-synuclein deposits in thepost-mortem brain biopsy in patients with PD has further substantiated the role of inflammation in PD. It has been suggested thatthe α-synuclein misfolding might begin in the gut and spread “prion like” via the vagus nerve into lower brainstem and ultimately tothe midbrain; this is known as the Braak hypothesis. It is noteworthy that the presence of gastrointestinal symptoms (constipation,dysphagia, and hypersalivation), altered gut microbiota and leaky gut have been observed in PD patients several years prior to theclinical onset of the disease. These clinical observations have been supported by in vitro studies in mice as well, demonstrating the roleof genetic (α-synuclein overexpression) and environmental (gut dysbiosis) factors in the pathogenesis of PD. The restoration of the gutmicrobiome in patients with PD may alter the clinical progression of PD and this alteration can be accomplished by carefully designedstudies using customized probiotics and fecal microbiota transplantation.