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( Chelliah R. ),( S. R. Ramakrishnan ),( U. Antony ),( S. H. Kim ),( I. Khan ),( C. N. Tango ),( P. N. Kounkeu ),( S. Wei ),( M. S. Hussain ),( E. B. M. Daliri ),( R. Momna ),( M. Y. Kwon ),( E. H. Le 강원대학교 농업생명과학연구원(구 농업과학연구소) 2018 강원 농업생명환경연구 Vol.30 No.1
Plant proteins are important functional ingredients in many processed food products. In particular, globular proteins from various sources play an important role in many food products. In the current study, 11S globulin protein from white sesame seeds, amandin protein from almond seeds, and cucurbitin protein from pumpkin seeds were extracted by means of ammonium sulfate precipitation and purified by anion-exchange chromatography on a DEAE-Sephadex column (20 × 30 cm). Amandin protein of almond and cucurbitin protein of pumpkin seeds both belong to the 11S globulin family. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of protein samples treated with reducing agents revealed that the isolated 11S globulin from white sesame seeds was composed of an acidic (30-33 kDa) and basic (20-24 kDa) polypeptide, amandin from almond seeds was composed of an acidic (40-42 kDa) and basic (15-20 kDa) polypeptide, and cucurbitin from pumpkin seeds was composed of an acidic (35-42 kDa) and basic (20-25 kDa) polypeptide. The alpha amylase-inhibiting activities of the three proteins was determined. Cucurbitin of pumpkin seeds had a greater alpha amylase inhibitory effect (-86%) than 11S globulin of sesame (82.6%) and amandin protein of almond seeds (76%). The antihypertensive effect of the three proteins was evaluated by a chrioallantoin membrane assay in chick embryos, which revealed that cucurbitin protein showed higher vasodilatation activity than the other two proteins.
Effect of growth temperature on gallium nitride nanostructures using HVPE technique
Munawar Basha, S.,Ryu, S.R.,Kang, T.W.,Srivastava, O.N.,Ramakrishnan, V.,Kumar, J. North-Holland 2012 Physica E, Low-dimensional systems & nanostructure Vol.44 No.9
The growth of hexagonal wurzite one dimensional (1D) gallium nitride (GaN) nanostructures on sapphire substrates using hydride vapor phase epitaxy (HVPE) process was carried out at two different temperatures (973K and 1023K). The GaN nanoneedles were formed at 973K and hexagonal nanorods get formed at 1023K. The morphologies of these nanostructures were studied using high resolution scanning electron microscope. X-ray diffraction and micro-Raman spectroscopy measurements confirmed that the as grown GaN nanostructures are of hexagonal wurtzite structure without any oxide phase. The emission properties of these nanostructures have been investigated using photoluminescence.
R. Ramakrishnan,Somashekhar S. Hiremath,M. Singaperumal 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"As gasoline prices rise and the green movement grows, more fluid power companies are working to develop hydraulic hybrid drive trains for large trucks to passenger cars and wind turbines. The hydraulic hybrid drive system is more effective and efficient than traditional hybrid systems because the quantum of recuperation energy generated is comparatively very high. Series hydraulic hybrid system specially designed for stop-and-go vehicles captures energy as the vehicle brakes and puts the vehicle in motion, when the vehicle is restarted. Then the engine kicks in, once the energy captured gets depleted. The kinetic energy lost as heat energy during mechanical friction braking is recovered and stored in the hydraulic accumulator as potential energy during hydrostatic regenerative braking. This paper gives an insight in to the dynamic simulation results obtained using LMS AMESim tool and effect of various system parameters like pre-charge pressure and hydraulic pump/motor maximum displacement on system output power. Varying the pre-charge pressure of the accumulator and controlling the hydraulic pump/motor maximum displacement show significant improvement in the system output power. Maximizing the system output power indirectly leads to less fuel consumption and pollution reduction in hybrid vehicles."
Role of Antihypertensive Peptides from Plant (sesame, almond and pumpkin) Seed Storage Protein
( Chelliah R. ),( S. R. Ramakrishnan ),( D. H. Oh ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2017 강원 농업생명환경연구 Vol.29 No.3
Proteins are a potential source of health-promoting biomolecules with medical, nutraceutical, and/or food applications. In particular, plant proteins, including globular proteins, represent important functional ingredients in many processed food products. Thus, the current study investigated and compared the antihypertensive properties of globulin, amandin, and cucurbitin proteins isolated from white sesame, almond, and pumpkin seeds, respectively. Extracted globulin, amandin, and cucurbitin proteins were shown to each comprise acidic and basic polypeptides of varying sizes (globulin polypeptides, 30-33 and 20-24 kDa, respectively; amandin polypeptides, 40-42 and 15-20 kDa, respectively; cucurbitin polypeptides, 35-42 and 20-25 kDa, respectively). The alpha amylase-inhibiting activity and resulting antihypertensive effects exhibited by the isolated 11S globulin, amandin, and cucurbitin polypeptides were characterized. Finally, the current study also reviewed current literature with regard to the properties of various peptides released by plant proteases, and their mitigating effects on disorders such as hypertension, diabetes, obesity, and cancer.
G Venugopal,S Ramakrishnan 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.3
Purpose In this work, an attempt has been made to analyzesurface electromyography (sEMG) signals in dynamiccontractions using bispectrum features. Methods Signals are recorded from the biceps brachii muscleof 50 healthy volunteers during curl exercise. Bispectrumand bicoherence are estimated from the recorded sEMGsignals. Sum and variance of bispectrum and bicoherence arecalculated. Further analysis is carried by dividing the entireduration of the exercise into six zones. Results obtained areverified using the subject’s feedback about first musclediscomfort time. Results Bispectrum is observed with high amplitude peaksat zone where subjects reported first muscle discomfort. Maximum values for sum and variance of bispectrum areobserved in the same zone. Similar patterns are not seen withbicoherence features. In bicoherence sum and bicoherencevariance, distinctive peaks are observed in the zone whentask failure occurs. Conclusions First discomfort zone estimated using bispectrumvariance is found to be in agreement with the subject'sfeedback. It appears that, this method is useful in analyzingprogressive changes associated with muscle mechanics infatigue conditions using non-invasive sEMG recordings.
Ameliorating Effect of Capsaicin on Alterations in Lipid Metabolism during Mice Lung Carcinoma
P. Anandakumar,S. Jagan,S. Kamaraj,G. Ramakrishnan,J. Binu Clara,D. Pathitha,T. Kavitha,T. Devaki 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.2
Spices and vegetables possess antioxidant activity that can be applied for preservation of lipids and lower lipid peroxidation in biological systems. In the present study, we have investigated the effect of capsaicin on lipid metabolism during benzo(a)pyrene induced lung cancer in Swiss albino mice. Benzo(a)pyrene (50 mg/kg wt) induced lung cancer animals showed abnormal changes in the tissue and serum lipids, lipoproteins and lipid metabolizing enzymes. Treatment with capsaicin (10 mg/kg body wt) remarkably attenuated all the above alterations and restored normalcy. These findings reveal the chemomodulatory potential of capsaicin in attenuating the alterations in lipid metabolism during experimental lung carcinogenesis.