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Communications in Theoretical Physics 2020年第7期72卷 104-110页

作者： F Ungan M K Bahar S pal M E Mora-Ramos Faculty of Technology Department of Optical EngineeringSivas Cumhuriyet University58140SivasTurkey Faculty of Science Department of PhysicsSivas Cumhuriyet University58140 SivasTurkey Department of Quality Assurance CQA(SA)DGQA Ichapur-Nawabganj24Pgs(North)743144West BengalIndia Centro de Investigación en Ciencias Instituto de Investigación en Ciencias Básicas y AplicadasUniversidad Autónoma del Estado de MorelosAv.Universidad 1001CP62209CuernavacaMorelosMexico Facultad de Ciencias Básicas Universidad de MedellínMedellinColombia

We present a theoretical study on the effects of intense laser field(ILF)and static electric field on the linear and nonlinear optical properties of a cylindrical quantum dot with Rosen-Morse axial potential under the framework of effective mass and parabolic band *** study also takes into account the effects of the structure parameters(η,V1,and R).The analytical expressions of the linear,third-order nonlinear and total optical absorption coefficients(TOACs)and the relative refractive index changes(RRICs)are obtained by using the compact-densitymatrix *** results of numerical calculations show that the resonant peak position of the TOACs and RRICs shifts towards lower energies and the magnitude of the peak increases with the effect of the static electric field and *** addition,it is observed that while the resonant energies of the TOACs and RRICs of system shift towards the higher(lower)energies with the enhancement ofη,V1,they decrease with the augmentation of ***,the findings of this study show that the optical properties of the structure can be adjusted by changing the magnitude of structure parameters and applied external fields.

关键词： cylindrical quantum dot nonlinear optical response intense laser field electric field

In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity

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nano-Micro Letters 2017年第2期9卷 58-67页

作者： Prasenjit Kar Tuhin Kumar Maji Ramesh nandi Peter Lemmens Samir Kumar pal Department of Chemical Biological and Macromolecular Sciences S.N.Bose National Centre for Basic SciencesBlock JDSector ⅢSaltLakeKolkata 700106India Institute for Condensed Matter Physics TU BraunschweigMendelssohnstraße 338106 BrunswickGermany Laboratory for Emerging nanometrology TU BraunschweigBrunswickGermany

Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi–Bi_2O_2CO_3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and high-resolution TEM(HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi–Bi_2O_2CO_3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue(MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi–Bi_2O_2CO_3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs.

关键词： Bi nanoparticles Bi–Bi2O2CO3 nanosheets Heterojunction Hydrothermal method Charge separation Visible light photocatalytic activity

Synergistic anti - Staphylococcus aureus activity of amoxicillin in combination with Emblica officinalis and nymphae odorata extracts

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Asian Pacific Journal of Tropical Medicine 2010年第9期3卷 711-714页

作者： Shyamapada Mandal Manisha DebMandal nishith Kumar pal Krishnendu Saha Department of Microbiology Bacteriology and Serology UnitCalcutta School of Tropical MedicineC.R.AvenueKolkata-700 073India Department of Physiology and Biophysics KPC Medical College and Hospital1F Raja S C Mallick RoadJadavpurKolkata-700 032India

Objective:To evaluate the antibacterial activity of Emblica officinalis Gaertn(***: Family:Euphorbiaceae) seed and nymphae odorala Aiton(***:Family:nymphaeaceae) stamen extracts,alone and in combination,and in combination with amoxicillin(Ax) against Staphylococcus aureus(***).Methods:Antibacterial activity of ethanolic extracts of amla,***,seed(AMS:500μg) and sapla,***,stamen(SAP:500 p g) for 12 methicillin-resistant ***(MRSA) isolates was determined following agar diffusion:in order to assess the combined antibacterial activity,AMS(250μg) plus SAP(250μg) were *** Ax(10μg) activity alone and in combination with AMS(250μg),and SAP(250μg) was determined by disk *** zone diameters of inhibition(ZDIs) for the agents were recorded,and growth inhibitory indices(GIIs) were ***:The MRSA isolates (n=12) had AMS(500μg) and SAP(500μg) ZDIs of 12-19 mm and 21-24 mm,*** ZDIs(range 24-27 mm) increased by 3-4 mm due to combined action of AMS(250μg) and SAP(250μg) indicating synergy between extracts for MRSA(GII 0.634-0.742).The MRSA isolates were resistant to Ax(ZDI:8-11 mm),which in combination with AMS and SAP had synergistic effect,both due to increased ZDI[mean±SD=(3.5±0.577) mm]and GII(0.631-0.894).Conclusions:The data suggest that the plants,*** and *** alone or in combination,are promising in the development of phytomedicines,which may be used,alone or in combination with the antibiotic. Ax,against MRSA infection.

关键词： Antibacterial activity Plant extract Amoxicillin Emblica officinalis nimphae odorata Synergy MRSA

Antibacterial activity of honey against clinical isolates of Escherichia coli,Pseudomonas aeruginosa and Salmonella enterica serovar Typhi

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Asian Pacific Journal of Tropical Medicine 2010年第12期3卷 961-964页

Objective:To ascertain the potential antibacterial activity of honey against clinical isolates of Escherichia coli(***),Pseudomonas aeruginosa(***) and Salmonella enterica serovar Typhi(*** serovar Typhi) by in vitro ***:The partial inhibitory concentration(PIC),minimum inhibitory concentration(MIC) and minimum bactericidal concentration(MBC) values of the autoclaved honey(extracted from Apis indica hive by indigenous method) were determined for *** serovar Typhi(n=8:from blood cultute), ***(n=5:from urine culture) and ***(n=5:from pus culture) isolates by in vitro ***:The PICs of the honey tested for the isolates ranged 0.50%-1.25%(v/v) for S. enterica serovar Typhi,0.75%-1.50%(v/v) for *** and 1.00%-1.25%(v/v) for ***, while the MICs ranged 1.75%-3.00%(v/v),3.00%-3.50%(v/v) and 3.50%(v/v),*** *** and *** isolates had MBC value of 4.00%(v/v):the *** serovar Typhi showed MBCs in between 3.00%and 3.50%(v/v).The bactericidal activity of honey was achieved at concentration 3.00%(v/v) for *** serovar Typhi and ***,and at 3.50%(v/v) for P. ***:The excellent antibacterial activity of honey against clinical bacterial isolates indicates the usefulness of honey in clinical practice against bacterial infection.

关键词： Partial inhibitory concentration Minimum inhibitory concentration Minimum bactericidal concentration Honey Clinical bacteria

A Leslie-Gower Holling Type-II Predator-Prey Mathematical Model with Disease in Prey Population Incorporating a Prey Refuge

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Journal of Mathematics and System Science 2016年第10期6卷 395-408页

作者： P. Mandal n. Das S. pal Department of Mathematics Hooghly Mohsin College Chinsurah Hooghly India. Department of Mathematics Maulana Azad College Kolkata India. Department of Mathematics University of Kalyani Nadia lndia.

We formulate and analyze a predator-prey model followed by Leslie-Gower model in which the prey population is infected by disease. We assume that the disease can only spread over prey population. As a result prey population has been classified into two categories, namely susceptible prey, infected prey where as the predator population remains free from infection. To investigate the behaviour of prey population we incorporate prey refuge in this model. Since the prey refuge decreases the predation rate then it has an important effect in our predator-prey interaction model. We have discussed the existence of various equilibrium points and local stability analysis at those equilibrium points. We investigate the Hopf-bifurcation analysis about the interior equilibrium point by taking the rate of infection parameter and the prey refuge parameter as bifurcation parameters. The numerical analysis is carried out to support the analytical results and to discuss some interesting results that our model exhibits.

关键词： Predator and prey Disease transmission Prey refuge Stability Hopf-bifurcation.

Doubled Haploid Production Using an Improved Anther Culture Protocol for Sorghum[Sorghum bicolor(L.)Moench]

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 475-487页

作者： Paul Chege Erzsébet Kiss Csaba Lantos Andrea palágyi János Pauk Cereal Research non-profit Ltd. Alsókikötősor 9Szeged6726Hungary Doctoral School of Plant Science Szent István UniversityGödöllőH2103Hungary

Sorghum[Sorghum bicolor(L.)Moench]can benefit from accelerated breeding and release of improved varieties through doubled haploid *** technology has been used in speeding up the breeding of other major cereals such as wheat,maize and rice,for which generally widely applied optimised protocols exist.A reproducible protocol for the crop,that can overcome genotype dependency and other species-specific challenges such as phenolic exudation is however *** study aimed at sorghum doubled haploids production thereby contributing to the development of an improved *** the 28 hybrid genotypes,both F1 registered-and experimental hybrids involved,this study successfully produced haploids from five genotypes and subsequently,four confirmed doubled-haploid lines on W14mf medium or its modification with 1.0 gl^(-1)L-proline,1.0 gl^(-1)L-asparagine and 1.0 gl^(-1)KH_(2)PO_(4).Medium 190-2Cu was used for regeneration and rooting,which occurred successfully,if the calli were transferred on to it less than 7 days after induction,and temperature was maintained at 25°C under light *** dependency was not wholly overcome;however,sorghum’s high tillering ability and abiotic stress tolerance were observed to contribute to attainment of haploid *** diploids producing seeds at rates of upto 80.5%were obtained,therefore eliminating the need for colchicine duplication.

关键词： In vitro androgenesis doubled-haploid sorghum anther-culture breeding

Lycopene modulates cellular proliferation, glycolysis and hepatic ultrastructure during hepatocellular carcinoma

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World Journal of Hepatology 2016年第29期8卷 1222-1233页

作者： Prachi Gupta nisha Bhatia Mohinder pal Bansal Ashwani Koul Department of Biophysics Basic Medical Sciences Block Ⅱ Panjab University

AIMTo investigate the effect of lycopene extracted from tomatoes (LycT) on ultrastructure, glycolytic enzymes, cell proliferation markers and hypoxia during n-nitrosodiethylamine (nDEA)-induced hepatocarcinogenesis. METHODSFemale BALB/c mice were randomly divided into four groups: The Control, nDEA (200 mg nDEA/kg b.w. given i.p.), LycT (5 mg/kg b.w. given orally on alternate days) and LycT + nDEA group. The mRnA and protein expression of various cell proliferation markers (PCnA, Cyclin D1, and p21) were assessed by reverse transcription-polymerase chain reaction and enzyme linked immunosorbent assay, respectively. The ultrastructure of hepatic tissue was analyzed using scanning and transmission electron microscopy. The enzymatic activity of glycolytic enzymes was estimated using standardized protocols, while glucose-6-phosphate dehydrogenase activity level was estimated using a kit obtained from Reckon Diagnostic P. Ltd. (India). RESULTSUncontrolled proliferation in the liver of nDEA (P ≤ 0.001) mice was evident from the high expression of cell-proliferation associated genes (PCnA, Cyclin D1, and p21) when compared to control and LycT mice. In addition, enhanced activities of hexokinase, phosphoglucoisomerase, aldolase, glucose-6-phosphate dehydrogenase and hypoxia-inducible factor-1α were observed in nDEA mice as compared to control (P ≤ 0.001) and LycT (P ≤ 0.001) mice. The alterations in hepatic ultrastructure observed in the nDEA group correlated with the changes in the above parameters. LycT pre-treatment in nDEA-challenged mice ameliorated the investigated pathways disrupted by nDEA treatment. Moreover, hepatic electron micrographs from the LycT + nDEA group showed increased macrophages, apoptotic bodies and well-differentiated hepatocellular carcinoma (HCC) in comparison to undifferentiated HCC as observed in the nDEA treated group. COnCLUSIOnThis study demonstrates that dietary supplementation with LycT has a multidimensional role in preventing HCC de

关键词： Hepatocellular carcinoma Ultrastructure Hypoxia Cell proliferation Lycopene Glycolysis

High Pressure - High Temperature Treatment of natural Diamonds

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High Pressure - High Temperature Treatment of Natural Diamon...

A Tm-Bi Co-Doped Fiber Laser with Dual Pumping Operation

18th International Conference on High Pressure Science and Technology

作者： J.Van Royen Yu.n.pal’yanov Hoge Raad voor Diamant GDI Research Department c/o WTOCDPlaslaar 50B-2500LierBelgium Institute of Mineralogy and Petrography Siberian Branch of the Russian Academy of SciencesPr.Ac.Koptyuga 3630090 NovosibirskRussia

＜正＞ The results are reported of High Pressure - High Temperature （HPHT） treatment experiments for natural diamonds of different origin and with different impurity content. Diamonds are annealed in a temperature range up to 2100℃ at stabilizing pressures up to 70 000 atmospheres. The evolution is studied, as a function of temperature, pressure and time, of different impurities in the diamond crystal lattice. The most common impurities in diamond are subtitutional nitrogen atoms. These can be present in isolated form, or in aggregates of two, three, four and more atoms, very often in combination with vacancies. According to the dominant nitrogen aggregate impurity type, diamonds are classified in categories such as type laA, type laB, type laAB, type Ib and type Ha. It is found that the results of the HPHT treatment depend strongly on the diamond type. Moreover it turns out that the presence of additional impurities, mainly related to lattice distortion, can lead to totally different results. The diamonds are characterized using UV-Visible spectrophotometry, Fourier Transform Infrared （FTIR） spectrophotometry and photoluminescence spectrometry, at room temperature as well as at cryogenic temperature. Characteristic optical centers of known composition are studied, such as e.g. n3, H2, H3 and H4. Moreover the spectra show a number of peaks of which the nature is not known. High Pressure - High Temperature treatments of natural gem quality diamonds have become very important recently, because of the colour changes they can induce. These colour changes can lead to tremendous price differences. For the stability of the diamond trade it is very important to develop methods to make the distinction between natural and treated colours. In several cases this distinction can not be made at present. Therefore a systematic study of the influence of HPHT treatment on different diamond types is most necessary.

关键词： natural Diamond HPHT treatment Colour Centers

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Chinese Physics Letters 2013年第3期30卷 71-74页

作者： n.Saidin S.W.Harun S.S.A.Damanhuri S.M.M.Ali H.Ahmad A.Halder M.C.Paul S.Das M.pal S.K.Bhadra Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Photonics Research Centre University of Malaya50603 Kuala LumpurMalaysia Fiber Optics and Photonics Division CSIR-Central Glass&Ceramic Research InstituteKolkataIndia

We demonstrate an efficient fiber laser operating at 1901.6 nm using a newly developed thulium bismuth co-doped fiber(TBF)with dual pumping at 792 nm and 1552 *** fiber was fabricated using modified chemical vapor deposition and solution doping *** dopant concentrations(wt%)and compositions inside the core are 0.15 Bi_(2)O_(3),0.3 Tm_(2)O_(3),1.0 Al_(2)O_(3) and 12.0 GeO_(2).The TBF laser operates at 1901.6 nm with a lasing efficiency of 33.2%and pump power threshold of 85 mW using a 2-m-long TBF in a linear cavity with two fiber Bragg gratings(FBGs).The high efficiency is attributed to the use of additional 1552 nm pump to complement 792 nm *** maximum output power of 225 mW is achieved at the pump power of 820 mW with the optimum length of 2 m.

关键词： pump fiber pumping