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Comparative phytochemical,thin layer chromatographic profiling and antioxidant activity of extracts from some Indian herbal drugs

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Journal of Bioresources and Bioproducts 2022年第2期7卷 46-52页

作者： md Sohail Akhtar Mohamed Rafiullah Wegdan Aly Shehata Amzad hossain Mohammed Ali School of Pharmacy College of Pharmacy and NursingUniversity of NizwaNizwaOman Phytochemistry Research Laboratory Department of Pharmacognosy and PhytochemistryFaculty of PharmacyJamia HamdardNew DelhiIndia Strategic Center for Diabetes Research College of MedicineKing Saud UniversityRiyadhSaudi Arabia

Natural antioxidants play a significant role to prevent cell breaking and regenerate *** plants native to India named dwarf morning-glory(Evolvulus alsinoides),Indian banyan(Ficus bengalensis)and chicory(Chicorium intybus)are used as medicine in India traditionally to treat *** aim of this study is to evaluate and compare the antioxidant activity as well as to compare phytochemical profiles of the aqueous extracts of the selected three *** dried plant powder was extracted with ethanol individually by using the Soxhlet method for eight hours and the solvent was evaporated under reduced ***,the air-dried powder was ex-tracted with water,and the water was *** thin layer chromatography(TLC)profile of the extracts was determined by using TLC densitometer and the antioxidant activity was deter-mined by the conventional 2,2-diphenyl-1-picrylhydrazyl(DPPH)*** TLC profile shows that there are no similarities of retention factor(R f)values among the plant extracts which means all three plants contain different chemical *** antioxidant activities of the aqueous extracts at different concentrations show different antioxidant *** inhibition is dose dependent,as doses are increasing then percentage inhibition is also increasing for all three plant *** the selected plants,the highest activity was found in *** and the lowest was in *** order of the antioxidant activity among the selected plants was ***<***<*** on the TLC profile and antioxidant activities,the highest activity of the selected plant species was evaluated.

关键词： Indian drug Thin layer chromatography(TLC)profile Plant extract Antioxidant activity

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Proposal for dispersion compensating square-lattice photonic crystal fiber

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Optoelectronics Letters 2021年第3期17卷 160-164页

作者： Ashraful hossain Howlader md.Sherajul Islam S.M.A.Razzak Department of Electrical and Electronic Engineering Rajshahi University of Engineering and TechnologyRajshahi 6204Bangladesh Department of Electrical and Electronic Engineering Khulna University of Engineering and TechnologyKhulna 9203Bangladesh Department of Electrical and Electronic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh

A dispersion-compensating square-lattice photonic crystal fiber for broadband compensation which covers the S, C and L communication bands, i.e. wavelength ranging from 1 460 nm to 1 625 nm is proposed in this paper. Theoretically, it is shown a negative dispersion coefficient of about-595 ps/(nm·km) to-1 288 ps/(nm·km) over S to L bands and-975 ps/(nm·km) at the operating wavelength 1 550 nm. The relative dispersion slope is perfectly matched to that of conventional single-mode fiber of about 0.003 6 nm^(-1). Besides the proposed photonic crystal fiber shows the large nonlinear coefficient of 61.88 W/km at the operating wavelength of 1 550 nm. Moreover, the variation of structural parameters is also studied and discussed here.

关键词： fiber dispersion crystal

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Nanophotonic-structured front contact for high-performance perovskite solar cells

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Science China Materials 2022年第7期65卷 1727-1740页

作者： md.Akhtaruzzaman Mohammad Ismail hossain Mohammad Aminul Islam md.Shahiduzzaman Ghulam Muhammad A.K.Mahmud Hasan Yuen Hong Tsang Kamaruzzaman Sopian Solar Energy Research Institute(SERI) Universiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Applied Physics Hong Kong Polytechnic University(PolyU)KowloonHong KongChina Centre for Integrated Systems Engineering and Advanced Technologies(Integra) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia(UKM)43600 BangiSelangorMalaysia Graduate School of Pure and Applied Sciences University of TsukubaTsukubaIbaraki 305-8573Japan Department of Electrical Engineering Faculty of EngineeringUniversity of MalayaJalan Universiti50603 Kuala LumpurSelangorMalaysia Nanomaterials Research Institute(NanoMaRi) Kanazawa UniversityKakumaKanazawa 920-1192Japan Department of Computer Engineering College of Computer and Information SciencesKing Saud University11543 RiyadhSaudi Arabia Department of Electrical and Computer Engineering University of CaliforniaDavisCA 95616USA Institute of Sustainable Energy Universiti Tenaga Nasional(@The National Energy University)Jalan IKRAM-UNITEN43000 KajangSelangorMalaysia

We report the design of a nanophotonic metaloxide front contact aimed at perovskite solar cells(PSCs)to enhance optoelectronic properties and device stability in the presence of ultraviolet(UV)***-quality Cr-doped ZnO film was prepared by industrially feasible magnetron sputter deposition for the electron transport layer of *** a means,the influence of the Cr content on the film and device was systematically ***-depth device optics and electrical effects were studied using advanced three-dimensional opto-electrical multiphysics rigorous simulations,optimizing the front contact for realizing high *** numerical simulation was validated by fabricating PSCs optimized to reach high performance,energy conversion efficiency(ECE)=17.3%,open-circuit voltage(V_(OC))=1.08 V,short-circuit current density(J_(SC))=21.1 mA cm^(-2),and fillfactor(FF)=76%.Finally,a realistic front contact of nanophotonic architecture was proposed while improving broadband light absorption of the solar spectrum and light harvesting,resulting in enhanced quantum efficiency(QE).The nanophotonic PSC enables J_(SC)improvement by~17%while reducing the reflection by 12%,resulting in an estimated conversion efficiency over 23%.It is further demonstrated how the PSCs’UV-stability can be improved without considerably sacrificing optoelectronic *** of nanophotonic designed ZnO:Cr front contact,PSCs device,and fabrication process are described.

关键词： ZnO:Cr front contact magnetron sputtering perovskite solar cells UV stability optics and electrical effects

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Double-E-Triple-H-Shaped NRI-Metamaterial for Dual-Band Microwave Sensing Applications

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Computers, Materials & Continua 2022年第6期71卷 5817-5836页

作者： Shafayat hossain md.Iquebal hossain Patwary Sikder Sunbeam Islam Sultan Mahmud Norbahiah Binti Misran Ali F.Almutairi Mohammad Tariqul Islam Department of Electrical&Electronics Engineering International Islamic University Chittagong4318ChittagongBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangiSelangor43600Malaysia Electrical Engineering Department Kuwait UniversityKuwait City13060Kuwait

This paper presents a new Double-E-Triple-H-Shaped NRI(negative refractive index)metamaterial(MM)for dual-band microwave sensing ***,a horizontal H-shaped metal structure is enclosed by two face-to-face E-shaped metal *** double-E-H-shaped design is also encased by two vertical H-shaped structures along with some copper ***,the Double-E-Triple-H-Shaped configuration is *** popular substrate materials of Rogers RO 3010 and FR-4 were adopted for analyzing the characteristics of the unit *** proposed structure exhibits transmission resonance inside the S-band with NRI and ENG(Epsilon Negative)metamaterial properties,and inside the C-band with ENG and MNG(Mu Negative)metamaterial properties.A good effective medium ratio(EMR)of 8.06 indicates the compactness and effectiveness of the proposed *** analysis has been done by changing the thickness of the substrate material as well and a significant change in the effective medium ratio is *** validity of the proposed structure is confirmed by an equivalent circuit *** simulated result agrees well with the calculated *** exploring microwave sensing applications of the proposed unit cell,permittivity and pressure sensitivity performance were investigated in different simulation *** compact size,effective parameters,high sensitivity and a good EMR represent the proposed metamaterial as a promising solution for S-band and C-band microwave sensing applications.

关键词： Metamaterial NRI MNG ENG dual-band sensing S-band C-band

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Assessment of macro and micro nutrients around brick kilns agricultural environment

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Information Processing in Agriculture 2016年第1期3卷 61-68页

作者： Abdul Halim Farhad Sikder Kalpana Begum Zakia Parveen md.Faruque hossain Department of Soil Water and EnvironmentUniversity of DhakaDhaka 1000Bangladesh American International University-Bangladesh Kamal Ataturk AvenueH 58/BRd 21BananiDhaka 1213Bangladesh

Brick kiln is well known as one of the main sources of air pollution;however,the pollutants produced from it do not remain in the air,they ultimately fall down to the soil and pollute the surroundings,therefore,this study was carried out to assess the status of macro(N,P,K and S)and micro nutrients(Fe,Mn and Zn,Cu)in the agricultural environment near the brick kilns of Young Brahmaputra and Jamuna Floodplain *** soil and plant samples were collected from four distances such as 250 m,500 m,1000 m,and 1500 m in three different ***(2352-3378 mg kg^-1),Zn(86-156 mg kg^-1)and Cu(24.7-46.9 mg kg^-1)are found in the elevated levels near brick kiln soils that is released due to burning of poor quality coal and fire *** alarming news is that plant uptake of S and micro nutrients in the nearest areas of the brick kilns are significantly higher than the areas far from the brick production and their concentration ranges from 23 mg kg^-1 to 101 mg kg^-1 for Zn,10-41 mg kg^-1 for Cu,35-1309 mg kg^-1 for Fe,26-126 mg kg^-1 for Mn and 2590-mg kg^-1 for *** indicates both soil and plant received maximum amount of micronutrients and S concentrations within 500-1000 m distances from brick *** and Mn concentrations vary within a permissible limit but the plant uptake is *** concentrations is increasing with the distance from the brick kilns in both soils and plants but no definite pattern of P and K accumulation was *** suggested avoiding agricultural practice nearby brick kiln soils due to micronutrient contamination in order to preserve adjoined agricultural environment.

关键词： Brick kilns Macroµ nutrient Agriculture Environment

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Hybrid Prediction Method for Solar Power Using Different Computational Intelligence Algorithms

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Smart Grid and Renewable Energy 2013年第1期4卷 76-87页

作者： md Rahat hossain Amanullah Maung Than Oo A. B. M. shawkat Ali Power Engineering Research Group (PERG) Central Queensland University Rockhampton Australia.

Computational Intelligence (CI) holds the key to the development of smart grid to overcome the challenges of planning and optimization through accurate prediction of Renewable Energy Sources (RES). This paper presents an architectural framework for the construction of hybrid intelligent predictor for solar power. This research investigates the applicability of heterogeneous regression algorithms for 6 hour ahead solar power availability forecasting using historical data from Rockhampton, Australia. Real life solar radiation data is collected across six years with hourly resolution from 2005 to 2010. We observe that the hybrid prediction method is suitable for a reliable smart grid energy management. Prediction reliability of the proposed hybrid prediction method is carried out in terms of prediction error performance based on statistical and graphical methods. The experimental results show that the proposed hybrid method achieved acceptable prediction accuracy. This potential hybrid model is applicable as a local predictor for any proposed hybrid method in real life application for 6 hours in advance prediction to ensure constant solar power supply in the smart grid operation.

关键词： Computational Intelligence Heterogeneous Regressions Algorithms Performance Evaluation Hybrid Method Mean Absolute Scaled Error (MASE)

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Predicting the effectiveness of protected areas of Natura 2000 under climate change

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Ecological Processes 2019年第1期8卷 162-182页

作者： Mst.Umme Salma Nila Carl Beierkuhnlein Anja Jaeschke Samuel Hoffmann md Lokman hossain Global Change Ecology International Elite Study ProgrammeUniversity of BayreuthUniversitätsstraße 3095447 BayreuthGermany Department of Biogeography University of BayreuthUniversitätsstraße 3095447 BayreuthGermany Department of Geography Hong Kong Baptist University15 Baptist University RoadKowloon TongHong Kong Department of Environmental Protection Technology German University Bangladesh1702 GazipurBangladesh.

Background:Protected areas(PAs)are aimed to hold the environmental conditions that facilitate species and ecosystems to *** can become climatically unsuitable and unable to sustain their current number of species under climate *** Natura 2000(N2K)is the largest coordinated conservation tool assigned to maintain the long-term survival of Europe’s most significant species and *** attempting to understand the effectiveness of PAs in the face of climate change scenarios,we tested two hypotheses:(1)PAs in the Alpine and the Boreal biogeographical regions will experience more newly emerged climate conditions(hotter and drier)compared to the climate representation of other biogeographical regions under future climate in Europe and(2)PAs in the Mediterranean and the Continental biogeographical regions will face more consistency in climate conditions due to less area of disappearing and novel climate in ***:Current climate data(1960–1990)and projections for 2050 and 2070 of PAs of N2K were extracted from WorldClim global climate *** components analysis(PCA)was performed to construct climate space for the PAs across the biogeographical regions based on 19 climatic variables assessed at 5-km *** 10.1 was used to map the location of the novel and disappearing ***:PAs in the Alpine region will experience more novel climate conditions in the future compared to other biogeographical *** future projections showed that 17.70%of the PAs in the Alpine region will experience novel climate by *** climate consistency was observed in the PAs in the Continental region compared to the other biogeographical *** results showed that about 176 km2 of the selected PAs in the Continental region will face new emerging climate,while about 110 km2 will disappear under RCP 8.5 *** prediction also revealed that in the Mediterranean region 08 PAs will experience novel climate and 786 km2 areas

关键词： Biodiversity conservation Biogeographical region Climate change Climate scenarios Natura 2000,Protected areas

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Pharmacological evaluation of Musa seminifera Lour. fruit

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Journal of Integrative Medicine 2013年第4期11卷 253-261页

作者： Sanjib Saha Faroque hossain md. Anisuzzman md. Khirul Islam Phytochemistry and Pharmacology Research Laboratory Pharmacy Discipline Life Science School Khulna University

OBJECTIVE： To study potential antioxidant, analgesic, antidiarrheal, and antibacterial activities of the ethanol extract of Musa seminifera Lour. fruit in different established in vivo and in vitro experimental models. METHODS： In vitro antioxidant activity was studied in 2,2-diphenyl-1-picrylhydrazyl （DPPH） radical-scavenging assay. Phenolic content was determined using Folin-Ciocalteu＇s reagent. Reducing ability was evaluated by ferric reducing power assay. Peripherally and centrally acting analgesic activity was studied in three different in vivo models, namely, acetic acid-induced writhing, hot-plate test, and tail-flick test in Swiss albino mice. In vivo antidiarrheal activity was evaluated in castor oil- and magnesium sulfate-induced diarrhea in mice. Gastrointestinal motility test was also carried out in mice. All studies in mice were undertaken at the doses of 250 and 500 mg/kg body weight. Antibacterial activity was assessed by disk diffusion assay against some Gram-positive and Gram-negative bacterial strains. Acute toxicity test was conducted to assess the safe doses of the extract. RESULTS： The extract showed 50% inhibitory concentration value of 12.65 μg/mL in DPPH radical- scavenging assay. Phenolic content was found to be 589.83 mg gallic acid equivalent per 100 g of dried fruits extract. Reducing power was in a concentration-dependent manner, and strongly comparable with the standard ascorbic acid. The extract demonstrated significant inhibition of writhing in acetic acid-induced writhing test at both dose levels （P〈0.01）. The extract also raised pain threshold in both hot-plate and tail-flick test in a dose-dependent manner, and the results were statistically significant （P〈0.01）. The extract significantly （P〈0.01） increased latent period, and decreased defecation in both castor oil- and magnesium sulfate-induced diarrhea. The extract also decreased gastrointestinal motility in mice. In disk diffusion assay, the extract showed potential antibacteria

关键词： Musa plant extracts antioxidants antidiarrheals analgesics agents, antibacterial mice

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Isolation and structural elucidation of antifungal compounds from Curcuma amada

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Asian Pacific Journal of Tropical Medicine 2019年第3期12卷 123-129页

作者： Jesmin Akter Kensaku Takara md.Zahorul Islam md.Amzad hossain Ayako Sano De-Xing Hou The United Graduate School of Agricultural Sciences Kagoshima University Faculty of Agriculture University of the Ryukyus

Objective: To isolate and identify the antifungal compounds from Curcuma amada. Methods: The antifungal activity was measured by the diameter of colonies grown on Petri dish,microscopic observation,and CLSI microdilution methods. The antifungal compounds were isolated through bioactivity guided purification by using silica gel and high-performance liquid chromatography. Structural identification of the antifungal compounds was conducted using 1 H NMR,13 C NMR,and liquid chromatography-tandem mass spectrometry. Results: The purified antifungal compounds were zederone and furanodienone. These two compounds showed dose-dependent antifungal activity against Fusarium solani sensu lato. The concentration required for 50% growth inhibition(IC50) of FSSL ranged from 115 to 129 μM and 82 to 91 μM for zederone and furanodienone,respectively. Conclusion: This study suggested that the isolated compounds from Curcuma amada could be promising natural antifungal agents to control the diseases caused by Fusarium solani sensu lato.

关键词： Curcuma amada Fusarium solani sensu lato Antifungal compounds Zederone Furanodienone Nuclear magnetic resonance

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Medicinal values of aquatic plant genus Nymphoides grown in Asia: A review

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Asian Pacific Journal of Tropical Biomedicine 2018年第2期8卷 113-119页

作者： Zihan Rahman Khan Nargis Sultana Chowdhury Suriya Sharmin md.hossain Sohrab Pharmaceutical Sciences Research Division BCSIR Laboratories Department of Pharmacy Manarat International University

Nymphoides is an aquatic genus consisting about 50 species, of which few were accepted as traditional medicinal plants in Asia. The literature review revealed that Nymphoides species are widely used in Ayurvedic medicine as a popular drug, i.e. Tagara. They are also utilized by the traditional local healers of different Asian countries to treat various diseases, like convulsion, jaundice, fever, headache, etc. According to the in vivo and in vitro pharmacological studies, Nymphoides species have been claimed to possess major biological activities like anticonvulsant, antioxidant, hepatoprotective, cytotoxic, antitumor, etc. Biochemical profiling of different aquatic plants of this genus revealed the presence of some important phytochemicals as polyphenolic component, flavonoids, triterpenes, carbohydrates, glycosides, etc. Several valuable bioactive compounds including ephedrine, coumarin, secoiridoid glucosides, methyl quercetin, ferulic acid, foliamenthoic acid, etc. were also known to be isolated and identified from different Nymphoides species. The aim of this review is to analyze the published report based on the medicinal values of different Asian Nymphoides species, to provide the updated information about the ethnomedicinal, pharmacological as well as the phytochemical properties for the first time.

关键词： Nymphoides Aquatic Ayurvedic medicine Phytochemicals

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