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Phytochemical and Antimicrobial Study of an Antidiabetic Plant: Scoparia dulcis L.
L. Pari,M. Latha,K.M. Ramkumar,P.N. Damodaran,V. Rajeshkannan,T. Suresh 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.3
The antimicrobial and antifungal effects of different concentrations of chloroform/methanol fractions of Sco-paria dulciswere investigated. The isolated fractions were tested against different bacteria like Salmonella typhii, Staphylo-coccus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa, and Proteus vulgarisand fungal strains such asAlternaria macrospora, Candida albicans, Aspergillus niger, and Fusarium oxysporum. The isolated fractions exhibited sig-nificant antimicrobial and antifungal activity against all the tested organisms compared with respective reference drugs. Theisolated fractions of S. dulcisshowed properties like antimicrobial and antifungal activities that will enable researchers in turnto look for application-oriented principles.
L. Pari,N. Ashok Kumar 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.3
The protective effect of Moringa oleifera Lam. (Moringaceae) on hepatic marker enzymes, lipid peroxidation,and antioxidants was investigated during antitubercular drug (isoniazid, rifampicin, and pyrazinamide)-induced toxicity in rats.Enhanced hepatic marker enzymes and lipid peroxidation of antitubercular drug treatment was accompanied by a significantdecrease in the levels of vitamin C, reduced glutathione, superoxide dismutase, catalase, glutathione peroxidase, and glu-tathione S-transferase. Administration of Moringa oleifera extract and silymarin significantly decreased hepatic marker en-zymes and lipid peroxidation with a simultaneous increase in the level of antioxidants. We speculate that Moringa oleiferaextract exerts its protective effects by decreasing liver lipid peroxides and enhancing antioxidants.
L. Pari,M. Latha 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.4
In light of evidence that diabetes mellitus is associated with oxidative stress and altered antioxidant status, weinvestigated the effect of Scoparia dulcis plant extracts (SPEt) (aqueous, ethanolic, and chloroform) in streptozotocin diabeticrats. Significant increases in the activities of insulin, superoxide dismutase, catalase, glutathione peroxidase, glutathione-S-transferase, reduced glutathione, vitamin C, and vitamin E were observed in liver, kidney, and brain on treatment with SPEt.In addition, the treated groups also showed significant decreases in blood glucose, thiobarbituric acid-reactive substances, andhydroperoxide formation in tissues, suggesting its role in protection against lipid peroxidation-induced membrane damage.Thus, the results of the present study indicate that extracts of S. dulcis, especially the aqueous extract, showed a modulatoryeffect by attenuating the above lipid peroxidation in streptozotocin diabetes.
Hepatoprotective Activity of Moringa oleifera on Antitubercular Drug-Induced Liver Damage in Rats
L. Pari,N. Ashok Kumar 한국식품영양과학회 2002 Journal of medicinal food Vol.5 No.3
Moringa oleifera Lam (Moringaceae), commonly known as “ Drumstick,” is used in Indianfolk medicine for the treatment of various illness. We have evaluated the hepatoprotectiveeffect of an ethanolic extract of M. oleifera leaves on liver damage induced by antituberculardrugs such as isoniazid (INH), rifampicin (RMP), and pyrazinamide (PZA) in rats. Oral ad-ministration of the extract showed a significant protective action made evident by its effecton the levels of glutamic oxaloacetic transaminase (aspartate aminotransferase), glutamicpyruvic transaminase (alanine aminotransferase), alkaline phosphatase, and bilirubin in theserum; lipids, and lipid peroxidation levels in liver. This observation was suplemented byhistopathological examination of liver sections. The results of this study showed that treat-ment with M. oleifera extracts or silymarin (as a reference) apears to enhance the recoveryfrom hepatic damage induced by antitubercular drugs.171
Sorrentino, L.,Polini, W.,Carrino, L.,Anamateros, E.,Paris, G. The Korean Society for Composite Materials 2008 Advanced composite materials Vol.17 No.1
Robotized filament winding technology involves a robot that winds a roving impregnated by resin on a die along the directions of stresses to which the work-piece is submitted in applications. The robot moves a deposition head along a winding trajectory in order to deposit roving. The trajectory planning is a very critical aspect of robotized filament winding technology, since it is responsible for both the tension constancy and the winding time. The present work shows two original rules to plan the winding trajectory of structural parts, whose shape is obtained by sweeping a full section around a 3D curve that must be closed and not crossing in order to assure a continuous winding. The first rule plans the winding trajectory by approximating the part 3D shape with straight lines; it is called the discretized rule. The second rule defines the winding trajectory simply by offsetting a 3D curve that reproduces the part 3D shape, of a defined distance; it is called the offset rule. The two rules have been compared in terms of roving tension and winding time. The present work shows how the offset rule enables achievement of both the required aims: to manufacture parts of high structural performances by keeping the tension on the roving near to the nominal value and to markedly decrease the winding time. This is the first step towards the optimization of the robotized filament winding technology.
A.C. Mendes,L.J.Q. Maia,E.C. Paris,M. Siu Li 한국물리학회 2013 Current Applied Physics Vol.13 No.8
In order to find a newEr-doped host for near infrared (NIR) opticalamplifiers, a study on the optimization of the erbium emission ions in the Y2O3-Al2O3-SiO2 system was performed. (100 - x) Y3Al5O12 - (x) SiO2powders (x varies from 0 to 70, in mol%)with a fixed Er2O3 concentration of 1.0mol% were synthesized by a modified Pechini method and heat-treated at 900 and 1000 ℃. The photoluminescence (PL) spectra at 1540 nm of the 4I13/2 → 4I15/2 transition of Er3+ ions and the up-conversion spectra at visible region (2H11/2 + 4S3/2 + 4F9/2 → 4I15/2) upon 980 nm excitation were evaluated. Different techniques, such as thermogravimetry (TG), differential scanning calorimetry (DSC), X-ray powder diffractometry (XRD)and Fourier transform infrared spectroscopy (FT-IR) were considered to evaluate crystallization and phaseevolution of the powders as a function of the silica content (x) and annealing temperature. The analyses were based on the comparison between two different solvents used in the preparation of the polymeric resins: ethanol and water. The optimal conditions for ethanol are quite different than the conditions for water used as solvent, confirming that the PL properties at the NIR region are highly sensitive to the changes in the host stoichiometry and processing conditions. The highest emission intensity at 1540 nm was observed for x = 30 for ethanol and x = 70 for water, treated at 900 and 1000 ℃, respectively. This result could be attributed to the combination of low symmetry and good dispersion of the Er3+ions in these hosts.
Sim, Min Sub,Paris, Guillaume,Adkins, Jess F.,Orphan, Victoria J.,Sessions, Alex L. Pergamon Press 2017 Geochimica et cosmochimica acta Vol.206 No.-
<P><B>Abstract</B></P> <P>Microbial sulfate reduction exhibits a normal isotope effect, leaving unreacted sulfate enriched in <SUP>34</SUP>S and producing sulfide that is depleted in <SUP>34</SUP>S. However, the magnitude of sulfur isotope fractionation is quite variable. The resulting changes in sulfur isotope abundance have been used to trace microbial sulfate reduction in modern and ancient ecosystems, but the intracellular mechanism(s) underlying the wide range of fractionations remains unclear. Here we report the concentrations and isotopic ratios of sulfur metabolites in the dissimilatory sulfate reduction pathway of <I>Desulfovibrio alaskensis</I>. Intracellular sulfate and APS levels change depending on the growth phase, peaking at the end of exponential phase, while sulfite accumulates in the cell during stationary phase. During exponential growth, intracellular sulfate and APS are strongly enriched in <SUP>34</SUP>S. The fractionation between internal and external sulfate is up to 49‰, while at the same time that between external sulfate and sulfide is just a few permil. We interpret this pattern to indicate that enzymatic fractionations remain large but the net fractionation between sulfate and sulfide is muted by the closed-system limitation of intracellular sulfate. This ‘reservoir effect’ diminishes upon cessation of exponential phase growth, allowing the expression of larger net sulfur isotope fractionations. Thus, the relative rates of sulfate exchange across the membrane versus intracellular sulfate reduction should govern the overall (net) fractionation that is expressed. A strong reservoir effect due to vigorous sulfate reduction might be responsible for the well-established inverse correlation between sulfur isotope fractionation and the cell-specific rate of sulfate reduction, while at the same time intraspecies differences in sulfate uptake and/or exchange rates could account for the significant scatter in this relationship. Our approach, together with ongoing investigations of the kinetic isotope fractionation by key enzymes in the sulfate reduction pathway, should provide an empirical basis for a quantitative model relating the magnitude of microbial isotope fractionation to their environmental and physiological controls.</P>