Dr. Md. Ekramul Islam - Academia.edu (original) (raw)

Papers by Dr. Md. Ekramul Islam

Biological Research, 2014

Background: Tribolium castaneum (Herbst) is a harmful pest of stored grain and flour-based produc... more Background: Tribolium castaneum (Herbst) is a harmful pest of stored grain and flour-based products in tropical and subtropical region. In the present study, rhizome of Drynaria quercifolia (J. Smith) was evaluated for pesticidal and pest repellency activities against T. castaneum, using surface film method and filter paper disc method, respectively. In addition, activity of the isolated compound 3,4-dihydroxybenzoic acid was evaluated against the pest. Results: Chloroform soluble fraction of ethanol extract of rhizome of D. quercifolia showed significant pesticidal activity at doses 0.88 to 1.77 mg/cm 2 and significant pest repellency activity at doses 0.94 to 0.23 mg/cm 2. No pesticidal and pest repellency activity was found for petroleum ether, ethyl acetate and methanol soluble fractions of ethanol extract as well as for 3,4-dihydroxybenzoic acid. Conclusion: Considering our findings it can be concluded that chloroform soluble fraction of rhizome of D. quercifolia is useful in controlling T. castaneum of stored grain and flour-based products.

In this study, we present a Bangla multi-domain sentiment analysis dataset, named as SentiGOLD, d... more In this study, we present a Bangla multi-domain sentiment analysis dataset, named as SentiGOLD, developed using 70,000 samples, which was compiled from a variety of sources and annotated by a gender-balanced team of linguists. This dataset was created in accordance with a standard set of linguistic conventions that were established after multiple meetings between the Government of Bangladesh and a nationally recognized Bangla linguistics committee. Although there are standard sentiment analysis datasets available for English and other rich languages, there are not any such datasets in Bangla, especially because, there was no standard linguistics framework agreed upon by national stakeholders. Senti-GOLD derives its raw data from online video comments, social media posts and comments, blog posts and comments, news and numerous other sources. Throughout the development of this dataset, domain distribution and class distribution were rigorously maintained. SentiGOLD was created using data from a total of 30 domains (e.g. politics, entertainment, sports, etc.) and was labeled using 5 classes (e.g. strongly negative, weakly negative, neutral, weakly positive, and strongly positive). In order to maintain annotation quality, the national linguistics committee approved an annotation scheme to ensure a rigorous Inter Annotator Agreement (IAA) in a multi-annotator annotation scenario. This procedure yielded an IAA score of 0.88 using Fleiss' kappa method, which is elaborated upon in the paper. A protocol for intra-and crossdataset evaluation was utilized in our efforts to develop a classification system as a standard. The cross-dataset evaluation was performed on the SentNoB dataset, which contains noisy Bangla text samples, thereby establishing a demanding test scenario. We Publication rights licensed to ACM. ACM acknowledges that this contribution was authored or co-authored by an employee, contractor or affiliate of a national government. As such, the Government retains a nonexclusive, royalty-free right to publish or reproduce this article, or to allow others to do so, for Government purposes only.

Journal of Scientific Research, Sep 1, 2018

The present study was designed to evaluate the effect of fruits extracts (Ficus hispida) on serum... more The present study was designed to evaluate the effect of fruits extracts (Ficus hispida) on serum lipids and antioxidant status in hypercholesterolaemic rats. Hyperlipidemia was induced by feeding high fat diet for 28 days and was evidenced by elevated levels of serum triglycerides (TG), serum LDL cholesterol and decreased serum HDL cholesterol. Oxidative stress was measured by determining the activity of antioxidant enzymes like superoxide dismutase (SOD), catalase (CAT), and amount of thiobarbituric acid reactive substances (TBARS) in liver homogenate of experimental rats. In hypercholesterolaemic rats, crude methanolic extract (CME) consumption had no effect on HDL-cholesterol, yet it showed a marked hypolipidaemic action, decreasing TG and LDL-cholesterol that had been increased after consuming the high-cholesterol diet. On the other hand, the concentration of TBARS decreased significantly, indicating decreased lipid peroxidation. In addition, the activities of catalase and SOD increased significantly in liver homogenate. The above evidence suggested that CME of the fruits of this plant can be a source of natural antioxidant that can reduce the plasma lipid (cholesterol) level and also decreases the lipid peroxidation.

Global Journal of Science Frontier Research, May 11, 2013

In this paper we examine the relationship between the Ideal and Boolean Algebra of Lattice. Here ... more In this paper we examine the relationship between the Ideal and Boolean Algebra of Lattice. Here the main result is that principal ideal (atom), principal dual ideal (filter) and also their product are Boolean algebra.

Heliyon, May 1, 2021

The low-pass nonlinear electrical transmission lines and the Cahn-Allen equation are important no... more The low-pass nonlinear electrical transmission lines and the Cahn-Allen equation are important nonlinear model equations to figure out different tangible systems, namely, electrical engineering, fluid dynamics etc. The contrivance of this study is to introduce advanced Bernoulli sub-equation function method to search for stable and effective solitary solutions of the described wave equations. Stable solitary solutions are reported as an integration of exponential functions, hyperbolic functions, etc., and the graphical implications for specific values of the corresponding parameters are explained in the solutions obtained in order to uncover the inmost structure of the tangible phenomena. It is establish that the IBSEF method is reliable, contented and might be used in further works to found ample novel soliton solutions for other types of NLEEs arising in physical science and engineering.

Development Growth & Differentiation, Sep 1, 2006

Fgf8 is among the members of the fibroblast growth factor (FGF) family that play pivotal roles in... more Fgf8 is among the members of the fibroblast growth factor (FGF) family that play pivotal roles in vertebrate development. In the present study, the genomic DNA of the zebrafish fgf8 gene was cloned to elucidate the regulatory mechanism behind the temporally and spatially restricted expression of the gene in vertebrate embryos. Structural analysis revealed that the exon-intron organization of fgf8 is highly conserved during vertebrate evolution, from teleosts to mammals. Close inspection of the genomic sequence and reverse transcription-polymerase chain reaction analysis revealed that zebrafish fgf8 encodes two splicing variants, corresponding to Fgf8a and Fgf8b, among the four to seven splicing variants known in mammals. Misexpression of the two variants in zebrafish embryos following mRNA injection showed that both variants have dorsalizing activities on zebrafish embryos, with Fgf8b being more potent. Reporter gene analysis of the transcriptional regulation of zebrafish fgf8 suggested that its complicated expression pattern, which is considered essential for its multiple roles in development, is mediated by combinations of different regulatory regions in the upstream and downstream regions of the gene. Furthermore, comparison of the genomic sequence of fgf8 among different vertebrate species suggests that this regulatory mechanism is conserved during vertebrate evolution.

Industrial Crops and Products, Oct 1, 2007

Fractionation of dhaincha (Sesbania aculeata), kash (Saccharum spontaneum) and banana stem (Musa ... more Fractionation of dhaincha (Sesbania aculeata), kash (Saccharum spontaneum) and banana stem (Musa Cavendish) was investigated by atmospheric formic acid pulping. Pulping of dhaincha, banana stem and kash was not satisfactorily delignified when the formic acid concentration was limited to 70%; even longer cooking time (120 min) at this concentration did not produce pulp of lower lignin content. The marked effect of delignification was observed in case of 90% formic acid concentration. Peroxyformic acid effectively reduced the residual lignin of the formic acid pulp. In alkaline peroxide bleaching, formic acid pulp was bleached to 75-83% brightness depending on the nonwood. The strength properties were almost comparable to conventional pulp. The dhaincha pulp was stronger than the banana stem and kash pulp. The bleaching improved the strength properties of the pulp. Isolated lignin from formic acid spent liquor had higher syringyl unit than guaiacyl unit. Its ␤-O-4 bond was cleaved during formic acid pulping, which increased phenolic hydroxyl group. The lignin was formylated during pulping. The major devolatilization of formic acid lignin was occurred between 200 and 550 • C as shown by TG graph. The xylose was the main sugar in water-soluble fractions of formic acid spent liquor that represented 50-60% of the content in original raw materials.

AIP Advances, Mar 1, 2023

Transfer entropy (TE) has proven to be an effective tool for determining the causal connection be... more Transfer entropy (TE) has proven to be an effective tool for determining the causal connection between two processes. For example, TE has been used to classify leader and follower agents in collective dynamics in the Vicsek model (VM). However, previous results have limited interaction radii, which are precisely the same among all agents, which is not realistic in practice. Here, we propose a modified version of the VM where the domains in which an agent can be influenced by others vary from agent-to-agent, which matches more closely with a real-life setting where not all agents have the same physical traits. We demonstrate that the TE vs cutoff technique is robust and efficacious in determining the maximum distance at which two interacting agents can transfer information in the system. We find that for two agents with different interaction domains, the derivative of the average inward TE can determine the individual agent's interaction domain. In a system with numerous agents, the TE vs cutoff technique is shown to be effective in predicting the average interaction domain of all agents, where the interaction domain of each agent was randomly selected from a Gaussian distribution.

Bangladesh Journal of Botany, Jun 28, 2022

An efficient in vitro regeneration system was developed for Withania somnifera (L.) Dunal through... more An efficient in vitro regeneration system was developed for Withania somnifera (L.) Dunal through direct and indirect organogenesis from nodal and leaf segment explants. Highest direct shoot regeneration was recorded when nodal explants were cultured on MS with 2.0 mg/l BAP and 0.5 mg/l NAA where the average number of shoots per explants was 10.5. For indirect regeneration remarkable results on shoot initiation were observed when node and leaf segment callus were cultured on MS +1.0 mg/l BAP +0.5 mg/l NAA. It was observed that node callus showed best response for multiple shoot/explants (28.9) on MS +1.0 mg/l BAP +0.5 mg/l NAA. But the mean of shoots from the callus of leaf segment explants was found to be 15.1 on the same media. The best response towards root induction was observed on MS with 2.5 mg/l IBA. The well rooted plants were successfully acclimatized and transferred to soil.

Antioxidants are vital substances which possess the ability to protect the body from damage cause... more Antioxidants are vital substances which possess the ability to protect the body from damage caused by free radical induced oxidative stress. A variety of free radical scavenging antioxidants exist within the body, many of them are derived from dietary sources like fruits, vegetables and teas. In this study the antioxidant activity of the ethanolic extract of Syzygium jambos bark (SJB) was investigated for antioxidant potential. The in-vitro antioxidant activities of the extract was evaluated by DPPH free radical scavenging assay, total antioxidant capacity, reducing power capacity, total phenol and total flavonoid content. The extract demonstrated significant dose dependent antioxidant activity. The extract of SJB was evaluated for in vivo efficacy by carbon tetrachloride (CCl 4) induced liver damage rats in hepatoprotective model. CCl 4 produced significant alteration of serum marker enzymes, total bilirubin, total protein and liver weight. Restoration of these values towards normal which is comparable to control group indicated hepatoprotective potential of the extract. The free radical scavenging and antioxidant activities may be attributed to the presence of phenolic and flavonoid compounds present in SJB. Due to its natural origin and potent free radical scavenging ability SJB could be used as a potential preventive intervention for free radical mediated diseases.

Iranian Journal of Science and Technology (Sciences), Nov 4, 2015

The presence of Tribolium castaneum (Herbst) in a stored food results in contamination and substa... more The presence of Tribolium castaneum (Herbst) in a stored food results in contamination and substantial economic damage due to loss of the products and a decrease in nutritional value. This study was conducted to determine the pesticidal and pest repellent activities of roots of Laportea crenulata Gaud. against T. castaneum. Pesticidal activity was determined using surface film method, whereas, filter paper disc method was used to determine the pest repellency property of the plant. Both chloroform and methanol soluble fractions of ethanol extracts of roots of L crenulata were found to possess pesticidal property. High mortality record (77-83% at 24-48 hours exposure duration) for chloroform fraction was found at a dose 1.77mg/cm 2. On the other hand, methanol fraction showed high mortality records (80-93%) at doses 0.44-1.77 mg/cm 2 , suggesting its superior pesticidal potency. Although, both fractions also showed pest repellency property, chloroform fraction has higher activity than methanol fraction. These results suggests that roots of L. crenulata possess both pesticidal and pest repellency activities against T castaneum and can be used in controlling pest of grain and flour based products.

Journal of Applied Polymer Science, Oct 1, 2014

The effect of polyether polyol and amino-functionalized multiwalled carbon nanotubes (NH 2-MWCNTs... more The effect of polyether polyol and amino-functionalized multiwalled carbon nanotubes (NH 2-MWCNTs) on the thermal stability of three-phase (epoxy/polyol/NH 2-MWCNTs) epoxy composites was investigated. Thermal stability and degradation characteristics of polyol/MWCNTs modified epoxy composites was evaluated using thermogravimetric analysis. The kinetics of thermal degradation was assessed from data scanned at 5, 10, and 20 C/min. Activation energy for degradation of epoxy nanocomposites was calculated using different differential and integral methods, that is, Kissinger's, Flynn-Wall-Ozawa, Coats-Redfern, and Horowitz-Metzger methods. In addition, the integral procedure decomposition temperature was determined to evaluate the inherent thermal stability of the modified composite system. Rate of thermal degradation in MWCNT/Polyol samples was found to be reduced significantly while activation energy of degradation was increased compared to unmodified epoxy composite. V

Journal of medical sciences, Apr 15, 2002

Arab journal of basic and applied sciences, 2020

The Landau-Ginzburg-Higgs equation and the modified equal width wave equation (MEWE) underscore t... more The Landau-Ginzburg-Higgs equation and the modified equal width wave equation (MEWE) underscore to describe superconductivity and unidirectional wave propagation in nonlinear media with dispersion systems. In the present study, the improved Bernoulli sub-equation function method (IBSEFM) has been introduced to accomplish applicable soliton solutions to the above stated wave equations. We ascertain adequate soliton solutions, videlicet the combination of hyperbolic function, exponential function etc. and speculate the physical significance of the obtained solutions for the definite values of the included parameters through depicting graphs and interpreted the physical phenomena. It is shown that the IBSEFM is powerful, suitable, direct and provide general wave solutions to NLEEs in mathematical physics.

Bangladesh Pharmaceutical Journal, Jul 23, 2020

The current study was designated to explore the antioxidant and antibacterial properties of the m... more The current study was designated to explore the antioxidant and antibacterial properties of the methanolic extract of Magnolia champaca stem bark and its different fractions. Antioxidant activity was assessed using total antioxidant capacity, ferric reducing power, DPPH, hydroxyl and hydrogen peroxide scavenging assay. Antibacterial activity was evaluated against five gram positive and five gram negative bacteria using disc diffusion assay method. Among the different fractions, chloroform fraction (CHF) and ethyl acetate fraction (EAF) showed the highest antioxidant activity whereas aqueous fraction (AQF) showed lowest activity in DPPH radical scavenging assay with IC 50 of 12.12, 22.41 and 55.16 µg/ml, respectively. Both of the extracts CHF and EAF also exhibited highest total antioxidant capacity, ferric reducing power and hydrogen peroxide scavenging activity with concentration dependent manner when compared to standard BHT. Moderate to potent antibacterial activity was observed against all tested organisms compared to standard azithromycin. The results from the present study revealed that the different fractions of stem bark of M. champaca specially CHF and EAF possess antioxidant and antibacterial property which support its use in traditional medicine and suggesting that the plant may be further investigated to discover its pharmacologically active natural products.

Journal of Scientific Research, Sep 1, 2016

The present study was designed to confirm the traditional use of the fruits of Ficus hispida Linn... more The present study was designed to confirm the traditional use of the fruits of Ficus hispida Linn. (Moraceae) as an antioxidant agent. Fruits of the plant extracted with methanol and crude methanol extract (CME) were further fractionated with n-hexane, chloroform, and ethyl acetate. All the fractions, n-hexane (NHF), chloroform (CHF), ethyl acetate (EAF), aqueous (AQF) and CME were preliminary screened for in vitro antioxidant activity and total phenolic and total flavonoid content. In DPPH radical scavenging assay, CME exhibited highest scavenging activity (IC 50 = 11.20 µg/mL) as compared to other fractions. In this assay, IC 50 of reference standard BHT was 5.10 µg/mL. The reducing power of the samples was in the order as AQF > CME > CHF > EAF > NHF. The results for hydrogen peroxide scavenging activity indicated that CME, EAF and AQF had almost the same scavenging activity except NHF. Total antioxidant capacity of CME and other fractions were ranked as CHF > AQF > CME > EAF > NHF. In the assay of antioxidant constituents (total phenol and total flavonoids content), the CME had highest phenolic and flavonoids content. The results indicate that Ficus hispida fruits could be considered as a potential source of natural antioxidant.

Physics Letters, Jul 1, 2022

$Research paper thumbnail of Searching closed form analytic solutions to some nonlinear fractional wave equations$

Arab journal of basic and applied sciences, 2021

Numerous tangible incidents in physics, chemistry, applied mathematics and engineering are descri... more Numerous tangible incidents in physics, chemistry, applied mathematics and engineering are described successfully by means of models making use of the theory of derivatives of fractional order and research in this area has grown significantly. In this article, we establish exact solutions to some nonlinear fractional differential equations. The recently established rational (G 0 =G)-expansion method with the help of fractional complex transform is used to examine abundant further general and new closed form wave solutions to the nonlinear space-time fractional mBBM equation, the space-time fractional Burger's equation and the space-time fractional ZKBBM in the sense of the Jumarie modified Riemann-Liouville derivative. The fractional complex transform reduces the nonlinear fractional differential equations into nonlinear ordinary differential equations and then the theories of ordinary differential equations are implemented effectively. It is observed that the performance of this method is reliable, useful and gives new and broad-ranging closed form solutions than the existing methods.

Drug discoveries and therapeutics, 2012

Herbal medicines have traditionally been used worldwide for the prevention and treatment of liver... more Herbal medicines have traditionally been used worldwide for the prevention and treatment of liver disease with fewer adverse effects. The leaves of the Syzygium jambos (SJL) plant were chosen and studied for their antioxidant activity in vitro and hepatoprotective activity in vivo. The antioxidant activity of the ethanol extract was examined in vitro using a 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay, reducing capacity, total phenol, total flavonoid content, and total antioxidant capacity. The extract had significant dose-dependent antioxidant activity in all in vitro experiments. IC 50 values of SJL and ascorbic acid (standard) were found to be 14.10 and 4.87 μg/mL, respectively, according to a DPPH radical scavenging assay. Hepatoprotective activity of the plant extract was evaluated in a rat model of carbon tetrachloride (CCl 4)-induced liver damage. CCl 4 significantly altered serum marker enzymes, total bilirubin, total protein, and liver weight. The extract caused these values to return to normal in rats with CCl 4-induced liver damage that were given SJL. This indicated the hepatoprotective potential of SJL and was comparable to use of the standard drug silymarin. Thus, the present study revealed that SJL may have antioxidant and hepatoprotective activity.