ORCID Profile
0000-0001-7270-9463
Current Organisations
McCarthy Phychology Services Pty. Ltd.
,
North South University
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Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0SM02117B
Abstract: The introduction of a gas bubble is a simple way to disrupt the apical coating of particles on liquid marbles to introduce additional reagents.
Publisher: Elsevier BV
Date: 04-2022
Publisher: AIP Publishing
Date: 07-2019
DOI: 10.1063/1.5099271
Abstract: A vast majority of syringe pumps operate on stepper motors, which limits their effectiveness for precision fluid delivery using estimation algorithms. Such a system also h ers the ability to ascertain if the infusion or aspiration instruction has been correctly carried out in the event of power interruptions. To address this issue, a linear servo based actuator system is described to provide absolute indications of the plunger position. System performance in terms of linearity and reliability of plunger translation were verified using a camera tracking system with syringe capacities ranging from 3 to 50 ml and at syringe plunger speeds ranging from 1 to 6.6 mm/s when distilled water was used as the medium. In investigations involving more viscous liquids, the system revealed similarly linear characteristics with 50% glycerol-water (v/v), but cyclical stick-slip behavior with Freund's adjuvant.
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 02-2022
DOI: 10.1016/J.CRYOBIOL.2021.11.179
Abstract: Cryopreservation is a widely used long-term preservation method to ensure the quality and vitality of microbes in laboratories and biological resource facilities. However, freeze-thaw damage and osmotic pressure changes during cryopreservation adversely impacts microbial survival. Significant expenditure of resources and expertise are required to select the right cryoprotectant and optimize its concentration for maximum survival of erse microorganisms. This work describes a cryopreservation method that obviates the need for cryoprotectants by exploiting the unique thermal characteristics of semi-spherical drops. Here, a plurality of these drops, each 10 μl in volume, created on a highly non-wetting flat-sheet substrate with holes and frozen at -70 °C. Deriving an f (x) metric as a measure of relative viability, storage in drops in the absence of cryoprotectants was found to improve the survivability of Staphylococcus epidermidis by 1.91 times compared with the same s le stored in larger 50-μl volumes in standard 1.5-ml tubes. This also compares well with a value of 2.33 obtained with standard preservation with cryoprotectant. The drop method allows high throughput aliquoting of the bacterial culture into multiple discrete drops using multichannel pipettes or automated liquid handlers and the edges of the holes provides a pinning action that holds the drop stably against gravitational roll-offs. It also allows s les to be removed in discrete small volumes, thus, reducing the number of freeze thaw cycles and associated cell damage. The flat-sheet architecture of the substrate reduces the amount of plastic waste generated and augments green laboratory practices.
Publisher: American Chemical Society (ACS)
Date: 28-06-2022
DOI: 10.26434/CHEMRXIV-2022-21J55
Abstract: A method where particulates are transferred via a cosmetic brush onto liquid drops created on a highly non-wetting substrate with a hole to generate talc and graphite liquid marbles (LMs) and talc-graphite Janus liquid marbles is described. van der Waals forces facilitated the attachment of particulates to the dry brush bristles. Subsequently, the surface tension forces arising from particle interaction with water (which were O(102) higher than the van der Waals forces) engendered transfer of the particulates to the liquid-gas interface of the drop. Forces below 1 mN applied by a dangling foil on the LM ensured preservation of the drop shape when the force was removed. During the application of this force, the contact angles at the contact lines behaved differently from sessile drops that are inclined on surfaces. This preparation method portends the ability to automate the creation of LMs and Janus LMs for various applications.
Publisher: Informa UK Limited
Date: 10-01-2023
Publisher: Elsevier BV
Date: 12-2020
Publisher: American Chemical Society (ACS)
Date: 26-01-2022
DOI: 10.1021/ACS.LANGMUIR.1C02965
Abstract: Highly wetting and nonwetting substrates have been widely used in fogwater collection systems for enhanced water harvesting. In this work, fog harvesting substrates comprising PVC strips of different wetting properties and widths ranging from 1-5 mm were vertically aligned and spaced apart at regular intervals to give the same solid area fraction of 0.8. Evaluation of the water collection efficiencies of the tested configurations revealed that 1 mm wide superhydrophilic strips was the most efficient, achieving double the amount of water harvested compared with 2.8 mm wide strips. This finding was attributed to the low Stokes numbers of the aerosol particle distribution of the fog which tended to result in them being brought by the flow streamlines toward the air gaps between the strips. Stagnant flow regions at the edges of each strip, revealed through potential flow calculations, then caused higher liquid imbibition and impaction there for water harvesting. It was also found that the Cassie nonwetting substrates that originally exhibited contact angles of 161° transformed to Wenzel wetting with zero contact angle within 60 min of fog interception. Optical profilometry revealed no obvious difference in surface roughness between the central region and edges of the strips, indicating that surface morphology was unlikely to be a contributing factor for enhanced water collection at the edges. The findings here indicated that highly wetting vertical strip architectures with narrow widths (1 mm) were favorable over wider strips for water harvesting provided that clogging and re-entrainment were not significant factors.
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 03-2020
Publisher: MDPI AG
Date: 18-10-2022
Abstract: The present study aimed to assess the changes in the prevalence and determinants of self-reported hypertension among older adults during the COVID-19 pandemic in Bangladesh. This repeated cross-sectional study was conducted on two successive occasions (October 2020 and September 2021), overlapping the first and second waves of the COVID-19 pandemic in Bangladesh. The survey was conducted through telephone interviews among Bangladeshi older adults aged 60 years and above. The prevalence of hypertension was measured by asking a question about whether a doctor or health professional told the participants that they have hypertension or high blood pressure and/or whether they are currently using medication to control it. We also collected information on the socio-economic characteristics of the participants, their cognitive ability, and their COVID-19-related attributes. A total of 2077 older adults with a mean age of 66.7 ± 6.4 years participated in the study. The s les were randomly selected on two successive occasions from a pre-established registry developed by the ARCED Foundation. Thus, the s le in the 2021-survey (round two n = 1045) was not the same as that in the 2020-survey (round one n = 1031) but both were drawn from the same population. The findings revealed that the prevalence of hypertension significantly increased across the two periods (43.7% versus 56.3% p = 0.006). The odds of hypertension were 1.34 times more likely in round two than in the round one cohort (AOR 1.34, 95% CI 1.06–1.70). We also found that having formal schooling, poorer memory or concentration, and having had received COVID-19 information were all associated with an increased risk of hypertension in both rounds (p 0.05). The findings of the present study suggest providing immediate support to ensure proper screening, control, and treatment of hypertension among older adults in Bangladesh.
Publisher: Elsevier BV
Date: 11-2023
Publisher: Research Square Platform LLC
Date: 29-11-2021
Publisher: Research Square Platform LLC
Date: 17-11-2022
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: MDPI AG
Date: 26-06-2023
DOI: 10.3390/MI14071306
Abstract: Digital microfluidics, which relies on the movement of drops, is relatively immune to clogging problems, making it suited for micro-reactor applications. Here, graphene oxide paper of 100 μm thickness, fabricated by blade coating sedimented dispersions onto roughened substrates, followed by drying and mechanical exfoliation, was found to be relatively free of cracks and curling. It also exhibited high wettability and elasto-capillary characteristics. Possessing low enough stiffness, it could rapidly and totally self-wrap water drops of 20 μL volume placed 2 mm from its edge when oriented between 0 and 60° to the horizontal. This complete wrapping behavior allowed drops to be translated via movement of the paper over long distances without dislodgement notwithstanding accelerations and decelerations. An amount of 2 drops that were wrapped with separate papers, when collided with each other at speeds up to 0.64 m/s, were found to eschew coalescence. This portends the development of robust digital microfluidic approaches for micro-reactors.
Publisher: AIP Publishing
Date: 10-2020
DOI: 10.1063/5.0007879
Abstract: A thermal cycling method, whereby capillary tubes holding polymerase chain reactions are subjected to programmed tilt displacements so that they are moved using gravity over three spatial regions (I, II, and III) kept at different constant temperatures to facilitate deoxyribonucleic acid (DNA) denaturation, annealing, and extension, is described. At tilt speeds in excess of 0.2 rad/s, the standard deviation of static coefficient of friction values was below 0.03, indicating in sync movement of multiple capillary tubes over the holding platform. The travel time during the acceleration phase and under constant velocity between adjacent regions (I to II and II to III) and distant regions (III to I) was 0.03 s and 0.31 s, respectively. The deviations in temperature did not exceed 0.05 °C from the average at the prescribed denaturing, annealing, and extension temperatures applied. DNA lification was determined by optical readings, the fluorescence signal was found to increase twofold after 30 thermal cycles, and 1.16 × 106 DNA copies/μl could be detected. The approach also overcomes problems associated with thermal inertia, s le adhesion, s le blockage, and handling of the reaction vessels encountered in the other thermal cycling schemes used.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 02-2021
Publisher: Wiley
Date: 30-12-2022
DOI: 10.1111/PSYG.12925
Abstract: Globally, the COVID‐19 pandemic seriously affected both physical and mental health conditions. This study aims to assess changes in the prevalence of depression among older adults during the COVID‐19 pandemic in Bangladesh and explore the correlates of depression in pooled data. This study followed a repeated cross‐sectional design and was conducted through telephone interviews on two successive occasions during the COVID‐19 pandemic (October 2020 and September 2021) among 2077 (1032 in 2020‐survey and 1045 in 2021‐survey) older Bangladeshi adults aged 60 years and above. Depression was measured using the 15‐item Geriatric Depression Scale (GDS‐15). The binary logistic regression model was used to identify the factors associated with depression in pooled data. A significant increase in the prevalence of depression was noted in the 2021 survey compared to the 2020 survey (47.2% versus 40.3% adjusted odds ratio (aOR): 1.40, 95% confidence interval (CI): 1.11–1.75). Depression was significantly higher among participants without a partner (aOR 1.92, 95% CI 1.45–2.53), with a monthly family income of BDT (aOR: 2.65, 95% CI 1.82–3.86) or 5000–10 000 BDT (aOR: 1.30, 95% CI 1.03–1.65), living alone (aOR 2.24, 95% CI 1.40–3.61), feeling isolated (aOR 3.15, 95% CI 2.49–3.98), with poor memory/concentration (aOR 2.02, 95% CI 1.58–2.57), with non‐communicable chronic conditions (aOR 1.34, 95% CI 1.06–1.69), overwhelmed by COVID‐19 (aOR 1.54, 95% CI 1.18–2.00), having difficulty earning (aOR 1.49, 95% CI 1.15–1.92) or obtaining food (aOR 1.56, 95% CI 1.17–2.09) during COVID‐19 pandemic, communicating less frequently (aOR 1.35, 95% CI 1.07–1.70) and needing extra care (aOR 2.28, 95% CI 1.75–2.96) during the pandemic. Policymakers and public health practitioners should provide immediate mental health support initiatives for this vulnerable population during the COVID‐19 pandemic and beyond. Policymakers should also invest in creating safe places to practise mindful eating, exercise, or other refuelling activities as a means of preventing and managing depression.
Publisher: Springer Science and Business Media LLC
Date: 22-01-2022
DOI: 10.1007/S10895-021-02884-0
Abstract: Low-cost analytical solutions built around microcomputers like the Raspberry Pi help to facilitate laboratory investigations in resource limited venues. Here, three camera modules (V1.3 with and without filter, as well as NoIR) that work with this microcomputer were assessed for their suitability in imaging fluorescent DNA following agarose gel electrophoresis. Evaluation of their utility was based on signal-to-noise (SNR) and noise variance metrics that were developed. Experiments conducted with s les were subjected to Polymerase Chain Reaction (PCR), and the lified products were separated using gel electrophoresis and stained with Midori green. Image analysis revealed the NoIR camera performed the best with SNR and noise variance values of 21.7 and 0.222 respectively. In experiments conducted using UV LED lighting to simulate ethidium bromide (EtBr) excitation, the NoIR and V1.3 with filter removed cameras showed comparable SNR values.
Publisher: Elsevier BV
Date: 2023
DOI: 10.2139/SSRN.4386954
Publisher: Elsevier BV
Date: 2022
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: Bangladesh
No related grants have been discovered for Hassan Ali Abid.