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Solution to some singular integro-differential equations II
J. N. Pandey,?F. Seifeddine 장전수학회 2006 Advanced Studies in Contemporary Mathematics Vol.13 No.1
In this paper we give solutions to some singular integro dierential equations of the types dydt+ a(t)Hy = f(t) (i) d2ydt2 + a(t)Hy = f(t) (ii) in the space of almost periodic functions, almost periodic distributions or semi-almost periodic distributions where a(t), b(t), and f(t) are all almost periodic functions or distributions or semi-almost periodic distributions and H is the operator of Hilbert transformations over these spaces. The equations (i) and (ii) are independent of each other and so also the coefficients a(t), b(t) and the input functions f(t). It is difficult if not impossible to find the general solutions to the above equations in terms of their coefficients and the input functions and thus it remains an open problem. We will therefore indicate the method of solving these equations by solving some specific cases which without any loss of generality will give the method of finding the general solution to the above integro-differential equations..
Methylation and subsequent glycosylation of 7,8-dihydroxyflavone
Koirala, N.,Pandey, R.P.,Parajuli, P.,Jung, H.J.,Sohng, J.K. Elsevier Science Publishers 2014 Journal of biotechnology Vol.184 No.-
An O-methyltransferase SpOMT2884, originating from Streptomyces peucetius ATCC 27952, was cloned, expressed, and applied for the production of target metabolite from Escherichia coli. Biochemical characterization of the 25kDa recombinant protein by in vitro and in vivo experiments showed that SpOMT2884 was an S-adenosyl-l-methionine-dependent O-methyltransferase. SpOMT2884 catalyzed O-methylation of different classes of flavonoids such as flavones (7,8-dihydroxyflavone (7,8-DHF), luteolin), flavonols (quercetin, rutin), flavanone (naringenin), and isoflavonoids (daidzein, formononetin). Biotransformation of 7,8-DHF, a preferred substrate of SpOMT2884, in a grown-induced culture of E. coli BL21 (DE3) harboring the recombinant pET-28a-SpOMT2884 stoichiometrically converted 7,8-DHF into 7-hydroxy-8-methoxyflavone, which was confirmed by liquid chromatography, mass spectrometry and various nuclear magnetic resonance (NMR) spectroscopy analyses. In order to improve the biotransformation substrate, time and media parameters were optimized and the production was scaled up using a 3-L fermentor. The maximum yield of 7-hydroxy-8-methoxyflavone was 192μM (52.57mg/L), representing almost 96% bioconversion within 12h, when 200μM of 7,8-DHF was supplemented in the culture. Further, the 7-hydroxy-8-methoxyflavone was purified in large scale and was used as a substrate separately for in vitro glycosylation to produce glucose, galactose and 2-deoxyglucose conjugated at 7th hydroxyl position of 7-hydroxy-8-methoxyflavone. Biological activity showed that 7-hydroxy-8-methoxyflavone had long term cytoprotective and antioxidant effects compared to 7,8-DHF suggesting that methylation enhances the stability of substrate and glycosylation has proved to increase the water solubility.
Shit, N.,Singh, R.P.,Sastry, K.V.H.,Agarwal, R.,Singh, R.,Pandey, N.K.,Mohan, J. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.7
Environmental stress boosts the levels of stress hormones and accelerates energy expenditure which subsequently imbalance the body's homeostasis. L-ascorbic acid (L-AA) has been recognized to mitigate the negative impact of environmental stress on production performances in birds. The present investigation was carried out to elucidate the effect of different dietary levels of L-AA on production performance, egg quality traits and fertility in Japanese quail at low ambient temperature. Sixty matured females (15 wks) were equally divided into three groups (20/group) based on the different dietary levels of L-AA (0, 250 and 500 ppm) and coupled with an equal number of males (1:1) obtained from the same hatch. They were managed in uniform husbandry conditions without restriction of feed and water at 14 h photo-schedule. Except for feed efficiency, body weight change, feed consumption and hen-day egg production were recorded highest in 500 ppm L-AA supplemented groups. Among the all egg quality traits studied, only specific gravity, shell weight and thickness differed significantly (p<0.05) in the present study. Fertility was improved significantly ($p{\leq}0.01$) to a dose dependent manner of L-AA. The findings of the present study concluded that dietary L-AA can be a caring management practice at least in part to alleviate the adverse effect of cold induced stress on production performance in Japanese quail.
Study on Biochemical Constituents of Caprine Ovarian Follicular Fluid after Superovulation
Mishra, O.P.,Pandey, J.N.,Gawande, P.G. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.12
The experiment was designed on 42 non pregnant Black Bengal goat. Out of which 18 were subjected to a superovulatory treatment comprising of eCG and hCG for embryo transfer study. The remaining 24 goats received no treatment and served as control for parameter studied as well as recipient for embryo transfer studies. Important biochemical constituents such as acid and alkaline phosphatase, total protein and cholesterol and inorganic phosphorus were estimated in the follicular fluid of control and treated group and the values were separately recorded for small medium and large size follicle. The results indicated a significant effect on acid phosphotase activity due to size of follicle. The value increased progressively from small to medium and from medium to large follicles. Alkaline phosphotase activity showed reverse trend. Alkaline phosphotase decreased progressively as size increased. The concentration of inorganic phosphorus did not reveal any significant difference between the control and treatment groups and also between the different size follicles. The concentration of protein decreased significantly from small to medium and from medium to large, although no difference was observed between the control and treatment groups. The concentration of Cholesterol in the follicular fluid indicated a significant increase from small to medium and to large follicle. Here also no difference was observed due to treatment. Similar in the composition of follicular fluid in the respect of above mentioned constituents indicated no of super ovulatory treatment on follicular fluid composition.
Kumar, Santosh,Garg, Pankaj,Pandey, Shambhavi,Kumari, Mridula,Hoon, Seonwoo,Jang, Kyoung-Je,Kapavarapu, Ravikumar,Choung, Pill-Hoon,Sobral, Abilio J. F. N.,Hoon Chung, Jong The Royal Society of Chemistry 2015 Journal of Materials Chemistry B Vol.3 No.17
<P>Gene therapy is the treatment of human disorders by the introduction of genetic material to specific target cells of a patient. Chitosan and its derivatives show excellent biological properties including biocompatibility, biodegradability and nonallergenicity. Primary amines of chitosan are responsible for its cationic nature and hence binding and protection of DNA for intracellular delivery. But the transfection efficiency of chitosan based gene transporters is severely hampered by its poor physical properties such as low water solubility and high viscosity. In this study, primary amines of low molecular weight (LMW) chitosan were coupled with 2-acrylamido-2-methylpropane sulphonic acid (AMP) making it water soluble for its application in gene delivery. AMP modified chitosan (CSAMP) showed an enhanced interaction with DNA and a higher buffering capacity due to AMP amines leading to a higher transfection efficiency in cancer cells (A549, HeLa and HepG2) compared to native chitosan and Lipofectamine®. <I>In vivo</I> studies in Balb/c through intravenous injection demonstrated a higher luciferase expression compared to LMW chitosan.</P>
Mishra, O.P.,Pandey, J.N.,Gawande, P.G. 韓國受精卵移植學會 2002 한국동물생명공학회지 Vol.17 No.2
The experiment was divided into two phases. In phase-I fresh embryos were transferred and in Phase-II frozen embryos were transferred. Embryos were collected by using Dulbecco's phosphate buffered saline. In phase-I total of 65 ova were collected out of 107 ovulation in 18 goats. Recovery of ova was 60.74%, of which 51 (78.46%) was fertilized. Sixteen embryos were transferred to 10 recipient goats and kidding was observed in 6 goats, that produced 10 kids. Thus, 62.50% embryo survival and 60% kidding were achieved in phase-I. In phase-II of the experiment, 17 regular cyclic Black Bengal goats were used. The main purpose was to study the viability of caprine embryos after cryopreservation. In this phase the embryos were collected and frozen using Bio-cool freezers. A two step addition of cryoprotectants (5% glycerol and 10% glycerol) and three-step dilution of cryoprotectants with 1mole (M) sucrose was used. Embryos were preserved for 10 to 45 days. Out of 27 embryos preserved, 18 were recovered after freezing and thawing (37 water bath) with 33.33% embryonic loss. Seventeen frozen and thawed embryos were transferred in 9 recipient goats, out of which kidding was observed in 6 goats and 7 kids were produced, giving a 66.66% kidding and embryo survival of 41.17%. The technique utilized for fresh and frozen embryo transfer can be successfully utilized to produce goats of superior genetic merits. The protocol used for addition of cryoprotectant, freezing, thawing and dilution was found suitable for caprine embryo freezing.