Rakibul Islam | Harvard University (original) (raw)

Papers by Rakibul Islam

Asian Journal of Medical and Biological Research

Chronic arsenic toxicity is a severe disease in men and animals which occurs severely in Banglade... more Chronic arsenic toxicity is a severe disease in men and animals which occurs severely in Bangladesh. Arsenic (As) contamination in ground water used in drinking is the major concern because arsenic is present in human and animal food chain. This work was done in quails with a view to observing the efficacy of spirulina (Spirulina platensis) and vitamin E for prevention of arsenic toxicity. 60 quails were used in this study and animals were divided into control group (T0), arsenic treated group (T1), arsenic plus spirulina treated group (T2) and arsenic plus vitamin E treated group (T3). Each group consists of 15 quails. Quails of T0 group were given normal feed and water and kept as control. Quails of T1, T2 and T3 were given 100 mg arsenic trioxide/L drinking water daily for 30 days. In addition to arsenic trioxide quails of group T2 and T3 were simultaneously fed with spirulina @ 1 gm/kg feed and vitamin E @ 400 mg /kg body weight up to 30 days respectively. Five quails from each ...

contains XRD, XPS, conductivity and magnetic dat

Single phase, sol–gel prepared Cu1–xFexO (0 ≤ x ≤ 0.125) powders are characterized in terms of st... more Single phase, sol–gel prepared Cu1–xFexO (0 ≤ x ≤ 0.125) powders are characterized in terms of structural, electronic and magnetic properties. Using dielectric and magnetic studies we investigate the coupling of electron and spin. The electrical conductivities and activation energies are studied with increasing Fe content. Modelling of experimental conductivity data emphasizes a single hopping mechanism for all samples except x = 0.125, which have two activation energies. Hole doping is confirmed by confirming a majority Fe3+ substitution of Cu2+ in CuO from X-ray photoelectron spectroscopy studies (XPS). Such a substitution results in stabilized ferromagnetism. Fe substitution introduces variation in coercivity as an intrinsic magnetic property in Fe-doped CuO, and not as a secondary impurity phas

The aim of this work was to investigate the effects of Nishyinda (Vitex nigundo</em&... more The aim of this work was to investigate the effects of Nishyinda (Vitex nigundo) and Neem (Azadirachta indica) leaves on growth performance and hematologic parameter in quail. A total of 40, 14th day old Japanese quail were randomly assigned into groups T0, T1, T2,and T3 and continued up to 42 days of age . Birds were reared on cage. The group T0 was kept as a control whereas group T1, T2and T3 were fed 2% Neem, 2% Nishyinda and 2% (1%Neem +1% Nishyinda) respectively, with commercial diet. At 14 days of age the initial average live body weights of T0, T1, T2 and T3 were 25.33±0.88, 26.67±0.88, 25.67±0.33, 26.33±0.88 respectively. On the 42 days of age the final live weight ofT0, T1, T2 and T3were 117.33±0. 88, 124.33±1.76, 121.33±1.20, 130.67±1.45 respectively. The highest body weight was obtained in T3 followed by T0 which differ significantly (P<0.01) from each other. Feed conversion ratio (FCR) for the T3 and T1 were from the control g...

Battery operated auto-rickshaw is a common three-wheeled fast-growing vehicle in Rangpur city. Th... more Battery operated auto-rickshaw is a common three-wheeled fast-growing vehicle in Rangpur city. This paper describes the social, economic, environmental impact and shows the purposive comparison of solar-based auto-rickshaw within the battery oriented auto-rickshaw in the area of Rangpur city. In this work, various questions were asked to the auto-rickshaw drivers, passengers, and importers for acquiring the total scenario of social and economic condition of auto-rickshaw. And for the environmental impact different data were collected from the power supply authorities of Rangpur city. The findings say that the number of autorickshaw was 400 in 2012 which has risen in the number to 6,500 in 2019 to a great extent which is the cause for reducing unemployment problem in accordance with increasing traffic jams. The findings of the study also contain that the economic and social condition gets improved by the owner of battery-operated auto-rickshaw whereas the rented battery-operated autorickshaw driver is not getting improvement as much as the owner of the auto-rickshaw but both having enough income compared with their previous profession's income. And only 32.5% drivers consider that there is less social value for the profession. Auto rickshaw has no sound pollution, but it is creating trouble by consuming electricity, which is produced by burning fossil fuel and are the cause of continuous air pollution. And according to the field survey total of 21,800 auto rickshaw runs every day in the Rangpur city which is consuming 19.62 megawatts of electricity where the production of electricity is limited as well as it is the cause of both shortage of electricity and 9810 kg emission of carbon per day. But the shortage of electricity and emission of CO 2 could be reduced or mitigated by using solar oriented auto rickshaw.

The duration of experiment was 28 days. Collection and Management of Quails At 14 days of age Jap... more The duration of experiment was 28 days. Collection and Management of Quails At 14 days of age Japanese quails were collected from A. Hakim quail hatchery and farm Gaibandha. The body weights of assigned quails were taken with digital balance and data were recorded. The finally selected 40 quails were housed under normal husbandry condition and divided into 4 groups To, T1, T2, and T3 and reared in cage system. Here Group T0 were kept control. Group T1, T2, T3 were fed 3%, 5% and 7% Azolla supplementation respectively. All of them were fed with commercial crumbled plus mesh feed and fresh water ad-libitum. Collection of Azolla Azolla were collected from few ponds located near the Baserhat, Dinajpur. Experimental Diets Azolla were dried in the sun and grinded. The grinded Azolla were added with commercial quail ration and served to different groups.

Reversible logic circuits are increasingly used in power Minimization having applications such as... more Reversible logic circuits are increasingly used in power Minimization having applications such as low power CMOS Design, optical information processing, DNA computing, Bioinformatics, quantum computing and nanotechnology. The problem of minimizing the number of garbage outputs is an important issue in reversible logic design. In the present paper an optimized and low quantum cost reversible multiplier using BME and Peres reversible logic gates is proposed. The proposed work is best compared to the other in terms of number of reversible gates and number of garbage outputs.

2021 6th International Conference on Inventive Computation Technologies (ICICT), 2021

Data mining and machine learning play a vital role in health care and also medical information an... more Data mining and machine learning play a vital role in health care and also medical information and detection, Now a day machine learning techniques use awareness of some major health risks such as diabetic prediction, brain tumor detection, covid 19 detections, and many more. The kidney is the most important organ of our body and if it has any problem then the impact is more dangerous to our body. Chronic kidney disease (CKD), otherwise referred to as renal disease. CKD requires disorders that damage and reduce the capacity of our kidneys to keep us healthy. So, it is required to be concerned about kidney disease to our very primary stage. We take a few attributes to measure our analysis about chronic kidney disease and this attribute is one of the major occurrences of chronic kidney disease. Therefore 8 machine learning classifier are used to measure analysis using weka tools namely: Logistic Regression(LG), Naive Bayes(NB), Multilayer Perceptron(MLP), Stochastic Gradient Descent(SGD), Adaptive Boosting(Adaboost), Bagging, Decision Tree(DT), Random Forest(RF) classifier are used. We feature extraction of all attributes using principal component analysis(PCA). We gain the highest accuracy from the Random Forest(RF) and it is 99 % and ROC(receiver operating characteristic) curve value is also highest from other algorithms.

Exposure and Health, 2021

This study aimed to examine the association between socioeconomic status (SES) and self-rated hea... more This study aimed to examine the association between socioeconomic status (SES) and self-rated health (SRH) among US adults and the extent to which blood and urinary metal mixtures explain this association. We used 14 years of repeated crosssectional data that consists of seven consecutive NHANES cycles from 2003 to 2016 (n = 9497). SRH was measured using a 5-point Likert scale, and SES was measured by family income to poverty ratio (FMPIR), levels of education, and employment status. Blood concentration of lead, mercury, and cadmium, and urinary concentrations of ten heavy metals (arsenic, barium, cadmium, cesium, cobalt, lead, mercury, molybdenum, thallium, tungsten) were used as metal mixtures. The total effect of SES on SRH was examined by linear regression model. The direct effect of SES on blood and urinary metal mixtures was examined by the weighted quantile sum (WQS) regression with repeated holdout validation method, and the average causal mediation effects of blood and urinary metal mixtures were examined by model-based causal mediation technique. Results showed that SES indicators [education β: 0.17; 95% Confidence Interval (CI): 0.15, 0.18; employment β: 0.16; 95% CI: 0.12, 0.21; and FMPIR β: 0.09; 95% CI: 0.08, 0.11] were significantly positively, and the WQS indices of blood and urine metal mixtures (blood β: −0.04; 95% CI: − 0.05, − 0.03, urine β: − 0.07; 95% CI: − 0.13, − 0.004) were significantly inversely associated with SRH in the US adults. The novel finding was the mechanism between SES and SRH that exposure to heavy metals may explain socioeconomic inequalities in SRH in the US general population. Longitudinal studies are needed to corroborate this study results.

International Journal of Monetary Economics and Finance, 2021

IEEE Transactions on Microwave Theory and Techniques, 2021

A uniplanar microstrip line RF/microwave real-time analog signal processing (RAP) units are propo... more A uniplanar microstrip line RF/microwave real-time analog signal processing (RAP) units are proposed in this article to operate concurrently at two frequencies for spectrum aggregation applications. First, a fundamental building block novel microstrip line dual-band Hilbert transformer (DBHT) is developed by integrating a dual-band 180° coupler and a dual-band delay line (DBD). The theoretical analysis is carried out to determine the relation of coupler and delay line forming closed loop resonance in the proposed circuit topology. Then, a dual-band edge detector from DBHT and a dual-band single-sideband (DBSSB) modulator composed of dual-band power divider/combiner (DBPD/DBPC), DBHT, and DBD are developed for dual-band real-time RF/microwave signal processing. To verify the proposed concept, a prototype of microstrip line DBHT working at 0.9 and 1.98 GHz is designed, and the measurement and simulation agree well with theoretical analysis. To demonstrate the real-time RF/microwave analog signal processing, a dual-band edge detector composed of DBHT is verified in the experiment. Furthermore, a prototype of microstrip line DBSSB modulator is fabricated and validated in the experiment to demonstrate the real-time single-sideband modulation at two concurrent RF/microwave frequencies.

Electronics, 2021

In this paper, a new analytical design technique for a three-section wideband Wilkinson power div... more In this paper, a new analytical design technique for a three-section wideband Wilkinson power divider is presented. The proposed design technique utilizes the dual-frequency behavior of commensurate transmission lines for the even-mode analysis and contributes a set of completely new and rigorous design equations for the odd-mode analysis. Measurement of a fabricated prototype utilizing the proposed technique shows an excellent return-loss (>16 dB), insertion loss (<3.35 dB), and excellent isolation (>22.7 dB) over 104% fractional bandwidth extending beyond the minimum requirements.

Translational Vision Science & Technology, 2020

To evaluate titanium (Ti) sputtering of the poly(methyl methacrylate) (PMMA) stem of the Boston K... more To evaluate titanium (Ti) sputtering of the poly(methyl methacrylate) (PMMA) stem of the Boston Keratoprosthesis (BK) as a method to enhance interfacial adhesion between the PMMA and the recipient corneal tissue. Methods: PMMA specimens were plasma treated with Ar/O 2 and coated with Ti using a DC magnetron sputtering instrument. The topography and hydrophilicity of the surfaces were characterized using atomic force microscopy and a water contact angle instrument, respectively. Scratch hardness and adhesion of the Ti film were measured using a mechanical tester. Biocompatibility assessments were performed using cultured human corneal fibroblasts and whole blood ex vivo. The optical quality of the Ti sputtered BK was evaluated using a custom-made optical bench. Results: By contact angle studies, the Ti coating improved PMMA hydrophilicity to match that of medical-grade Ti (Ti-6Al-4V-ELI). Ti sputtering of contact surfaces resulted in a plate-like morphology with increased surface roughness, without impacting the transparency of the BK optical component. Scratch testing indicated that the mechanical behavior of the Ti coating was similar to that of casted Ti, and the coating was stable in pull-off adhesion testing. Sputtered Ti film was highly biocompatible based on tests of cell viability, adhesion, proliferation, differentiation, collagen deposition, and keratocan expression, the properties of which exceeded those of uncoated PMMA and did not induce increased complement activation. Conclusions: Titanium coating of the BK stem generated a mechanically and biologically favorable interface, which may help to enhance corneal stromal adhesion and biocompatibility. Translational Relevance: Improving the biocompatibility of the BK PMMA stem may improve long-term outcomes of implantation.

Molecules, 2020

This study aimed to investigate how prolonged storage of adult retinal pigment epithelial (ARPE-1... more This study aimed to investigate how prolonged storage of adult retinal pigment epithelial (ARPE-19) cell sheets affects cell metabolism, morphology, viability, and phenotype. ARPE-19 cell sheets were stored at three temperatures (4 °C, 16 °C, and 37 °C) for three weeks. Metabolic status and morphology of the cells were monitored by sampling medium and examining cells by phase-contrast microscopy, respectively, throughout the storage period. Cell viability was analyzed by flow cytometry, and phenotype was determined by epifluorescence microscopy after the storage. Lactate production and glucose consumption increased heavily, while pH dropped considerably, through storage at 37 °C compared to 4 °C and 16 °C. During storage, morphology started to deteriorate first at 4 °C, then at 37 °C, and was maintained the longest at 16 °C. Viability of the cells after three weeks of storage was best preserved at 16 °C, while cells stored at 4 °C and 37 °C had reduced viability. Dedifferentiation i...

Asian Journal of Medical and Biological Research, 2020

This study was conducted under the Department of Physiology and Pharmacology to determine the eff... more This study was conducted under the Department of Physiology and Pharmacology to determine the effects of Neem and Nishyinda leaves supplementation on growth performance and GUT biosis in broilers. A total of 40 day old broiler chicks were divided into four groups A, B, C and D. Group A was considered as control, fed only with commercial broiler ration. Group B supplemented with formulation of 2 gm grinded Neem leaves, Group C with 2 gm grinded Nishyinda leaves and Group D with 1 gm grinded Neem leaves plus 1 gm grinded Nishyinda leaves per liter of water respectively. Observations were recorded for live body weight, weight gain, feed consumption, feed efficiency, hemato-biochemical parameters and GUT biosis specially the parasite of birds in six weeks. Body weights were increased significantly (p<0.05) in all treated groups in respect to the control and highest was recorded in combine Neem plus Nishyinda supplemented groups (Group D). No significant (p>0.05) differences were o...

Journal of Commerce and Management Thought, 2019

Journal of Applied Life Sciences International, 2018

An experiment was conducted with Long Evans rats to observe the comparative effects of Spirulina ... more An experiment was conducted with Long Evans rats to observe the comparative effects of Spirulina (Spirulina platensis) and Vitamin C to prevent Arsenic toxicity. Sixty male rats (age about 35 days; average body weight at day 0 was 75 g) were divided into five equal groups, namely control group (T 0), Arsenic treated group (T 1), Arsenic plus Spirulina treated group (T 2), Arsenic plus Vitamin C treated group (T 3) and Arsenic plus Spirulina plus Vitamin C treated group (T 4). Rats in the control group were given normal feed. Rats of T 1, T 2, T 3 and T 4 treated group were given Arsenic trioxide

Annual Research & Review in Biology, 2014

ABSTRACT The general purpose of this study was to evaluate farmers’ awareness towards the pestici... more ABSTRACT The general purpose of this study was to evaluate farmers’ awareness towards the pesticides used in rice-prawn integrated culture technique. Randomly selected survey technique was applied through direct observations and personal interviews for this study. : Data were collected from five different upazillas viz. Fultola and Dumuria of Khulna, Mollahat, Fokirhat and Chitolmari of Bagerhat district which were situated in the south-west region in Bangladesh from January to March 2011. Randomly selected survey technique was applied to collect information from sample farmers which were chosen by consultation with local Agriculture Extension Officer and Fisheries Officer. A total of 75 (45 from Bagerhat and 30 from Khulna) sample farmers were asked to mention various information. Eight active ingredients of pesticides within 28 trade names were used to kill pest such as the stem borers, green leafhoppers and some of grasshoppers and gall midges infesting the rice farms. Pesticide frequency was varied between 1 and 3 sprays per crop season. A total of 94% respondents applied pesticides for controlling pests, 5% respondents used biological control and 1% respondent did not use any technique for pest management. The pesticide groups Organophosphorus and carbamate were used by 40% and 38% of the respondents respectively and another 15% farmers used pyrethroid in their rice crop during the winter period. Various groups of pesticides were used in order of 36% for Carbofuran, 17% for Chloropyriphos, 12% for Malathion, 11% for Diazinon, 7% for Cyhalotrin, 3% for Carbosulfan, 1% for Thiomax and 7% for Cypermethrin, respectively of the respondent farmers. No banned pesticides were identified from the respondents during this survey. It is suggested that pesticides regulation and effective implementation, increasing farmer’s awareness of effective pesticide use and expansion of IPM (Integrated Pest Management) practices can be helped towards sustainable integrated rice-prawn culture in the part of Bangladesh.