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DEGUMMING OF SILK FABRIC WITH AN ENZYME DEGUMMASE
Chopra, Sheetal,Garg, Samir,Gulrajani, M. L. 한국잠사학회 1994 한국잠사곤충학회지 Vol.36 No.1
Degumming with enzyme Degummase can be a viale alternative to the existing methods of degumming. Degumming, carried out with the conventional method of Marseille's soap 25% (owf) for 1.5h at boil gives a weight loss of about 24%. On comparison, degumming with 10% enzyme at 50°C for 60 min gives a weight loss of about 22%. Treatment with enzyme reguires a much lower temperature and also the treatment time is shorter than the conventional process. Processing of silk at these conditions is likely to retain the lustre and softness of silk. To economise on the quantity of enzyme, conditions were optimised for a pad-store process. An enzyme concentration of 0.5% at 50°C for a time period of 5~6h resulted in a weight loss of 22%. Though the concentration of the enzyme used was 20 times less than that used for long liquor method there was some strength loss. At 50°C treatments carried out for 7~8 h resulted in some degradation. Strength loss occurs because enzyme in the absence of any stirring keeps acting at the face where it is deposited. Effect of temperature was more pronounced than time in degrading silk.
Chopra, A,O-Sullivan, I,Carr, J,Kim, T S,Cohen, E P Nature Publishing Group 2007 Cancer gene therapy Vol.14 No.6
In a prior report (Int J Cancer 2006; 119: 339–348), we described a new vaccination strategy for squamous cell carcinoma (SCC). The vaccine was prepared by transfer of unfractionated DNA-fragments (25 kb) from KLN205 cells, a squamous carcinoma cell line (DBA/2 origin; H-2<SUP>d</SUP>) into LM cells, a highly immunogenic mouse fibroblast cell line (C3H/He origin; (H-2<SUP>k</SUP>)). As only a small proportion of the transfected cell population was expected to have incorporated DNA segments that included genes specifying antigens associated with the squamous carcinoma cells, we devised a novel strategy to enrich the vaccine for immunotherapeutic cells. Enhanced immunity to squamous carcinoma was induced in tumor-bearing mice treated solely by immunization with the enriched vaccine, which translated into prolonged survival without toxicity. Here, we describe the characteristics of the cell populations infiltrating established squamous carcinomas undergoing regression in mice immunized with vaccines enriched for immunotherapeutic cells. The results indicated that CD8+ T cells were predominant and that T-regulatory cells (FoxP3+, CD4/CD25+, CD4/CD62L<SUP>high</SUP>, CD4/CTLA-4e) were relatively deficient in the regressing tumors. Inflammatory infiltrates were not detected in various organs and tissues of mice immunized with the DNA-based vaccine.Cancer Gene Therapy (2007) 14, 573–582. doi:10.1038/sj.cgt.7701040; published online 23 March 2007
Piezoelectric non-linearity in PbSc<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub> thin films
Chopra, A.,Kim, Y.,Alexe, M.,Hesse, D. Pergamon Press 2014 The Journal of physics and chemistry of solids Vol.75 No.11
Epitaxial (001)-oriented PbSc<SUB>0.5</SUB>Ta<SUB>0.5</SUB>O<SUB>3</SUB> (PST) thin films were deposited by pulsed laser deposition. Local piezoelectric investigations performed by piezoelectric force microscopy show a dual slope for the piezoelectric coefficient. A piezoelectric coefficient of 3pm/V was observed at voltages up to 0.8V. However, at voltages above 0.8V, there is a steep increase in piezoelectric coefficient mounting to 23.2pm/V. This nonlinear piezoelectric response was observed to be irreversible in nature. In order to better understand this nonlinear behavior, voltage dependent dielectric constant measurements were performed. These confirmed that the piezoelectric non-linearity is indeed a manifestation of a dielectric non-linearity. In contrast to classical ferroelectric systems, the observed dielectric non-linearity in this relaxor material cannot be explained by the Rayleigh model. Thus the dielectric non-linearity in the PST films is tentatively explained as a manifestation of a percolation of the polar nano regions.
Chopra, Purnima,Gupta, Mamta,Modi, Kanak Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.4
Our aim is to establish certain image formulas of the (p, 𝜈)-extended Gauss' hypergeometric function F<sub>p,𝜈</sub>(a, b; c; z) by using Saigo's hypergeometric fractional calculus (integral and differential) operators. Corresponding assertions for the classical Riemann-Liouville(R-L) and Erdélyi-Kober(E-K) fractional integral and differential operators are deduced. All the results are represented in terms of the Hadamard product of the (p, 𝜈)-extended Gauss's hypergeometric function F<sub>p,𝜈</sub>(a, b; c; z) and Fox-Wright function <sub>r</sub>Ψ<sub>s</sub>(z). We also established Jacobi and its particular assertions for the Gegenbauer and Legendre transforms of the (p, 𝜈)-extended Gauss' hypergeometric function F<sub>p,𝜈</sub>(a, b; c; z).
Participation of α2 Receptors in the Antinociceptive Activity of Quercetin
Kanwaljit Chopra,Rajnendrapal Kaur,Devinder Singh 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.4
The present work was planned to evaluate the antinociceptive activity of quercetin, its site of action, and the involvement of adrenergic receptors in mediating the antinociceptive activity in thermal and chemonociceptive assays. Eight groups were employed in this study: Groups I, II, and III received quercetin alone in different doses, group IV animals were administered clonidine, group V animals were co-administered quercetin and clonidine, group VI animals were administered yohimbine 30 minutes prior to administratin of quercetin, group VII animals were administered yohimbine 30 minutes prior to co-administration of quercetin and clonidine, and group VIII animals were administered 0.5% carboxymethylcellulose in saline (vehicle for quercetin). The thermal nociception was measured by tail flick and hot plate methods. Quercetin produced a significant analgesic effect in a dose-dependent manner. Co-administration of low doses of quercetin and clonidine produced a synergistic analgesic effect. Pretreatment with yohimbine significantly reversed quercetin-as well as clonidine/quercetin combination-induced effects. The results of this study reveal that quercetin induces an antinociceptive effect and that this effect involves primarily the modulation of adrenergic pathways.
Antidepressant Activity of Quercetin, a Bioflavonoid, in Streptozotocin-Induced Diabetic Mice
Kanwaljit Chopra,Muragundla Anjaneyulu,Indupal Kaur 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.4
Depression is highly prevalent in diabetics and is associated with poor glucose regulation and increased riskof diabetic complications. Identification and effective treatment of comorbid depression are increasingly being considered es-sential components of clinical care of diabetics. In the present study, the antidepressant activity of quercetin (50 and 100mg/kg, i.p.), a bioflavonoid, was evaluated using the Porsolt forced swimming-induced behavioral despair test in control and6-week-streptozotocin-induced diabetic mice. The effect of quercetin was compared with that of the classical antidepressantsfluoxetine (5 mg/kg, i.p.) and imipramine (15 mg/kg, i.p.). Streptozotocin-induced diabetic mice exhibited prolonged immo-bility duration during the test as compared with age-matched control mice. Quercetin dose-dependently reduced the immo-bility period in diabetic mice, and this effect was comparable to that of fluoxetine (5 mg/kg, i.p.) and imipramine (15 mg/kg,i.p.). Fluoxetine and imipramine significantly lowered the immobility time in naive mice also, but quercetin failed to induceany antidepressant activity in naive mice. The results of our preliminary study indicate that quercetin has the potential to beemployed as a therapy for depression associated with diabetes.