Publications by authors named "Mohamad A"

This study investigates the movements of particles in an accelerated toroidal flow channel filled with water, with specific applications for a particle imaging velocimetry gyroscope (PIVG). We used computational fluid dynamics (CFD) to simulate particle behavior under different angular accelerations. These angular accelerations were 4 rad/s, 6 rad/s, and 8 rad/s for particles densities of 1100 kg/m, 1050 kg/m, and 980 kg/m.

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The condensing reaction of 2-hydroxy-1-naphthaldehyde with quinoxalyl-2-carbohydrazide resulted in synthesizing of a novel derivative of hydrazone quinoxalyl ligand (Hdpq). The bonding behavior between Hdpq and Co(II) ion was investigated in molar ratios of 1: 1 and 2: 1 to produce two different complexes, Codpq and Co(dpq), respectively. Their chemical structure was verified using several spectroscopic approaches.

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  • Coinfections of tilapia with viruses and bacteria negatively impact global aquaculture, prompting the study of dietary supplements to enhance fish health.
  • Red hybrid tilapia were tested with three diets: a control, one with organic acids and digestive enhancers (strategy A), and another with organic acids and immunostimulants (strategy B).
  • Fish on dietary strategies A and B showed significantly lower mortality rates (50.0% and 41.7%, respectively) compared to 76.3% in the control group, with strategy B yielding the best immune responses and less organ damage.
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Unlabelled: Extraluminal foreign bodies are rare. Fish bone is the most common foreign body ingested by adults, while coin is the most common foreign body ingested among children. Sharp pricking pain is a sign of sharp foreign body (FB) ingestion.

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This study investigates the mechanism and effects of incorporating different ZrO nano-particles into SAC0307 solder alloys. ZrO nano-powder and nano-fibers in 0.25-0.

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  • This study investigates metronidazole resistance and virulence genotypes in H. pylori from Egyptian patients, highlighting the public health issue of antibiotic resistance in this bacterium.
  • The research involved collecting gastric biopsies from 250 symptomatic patients and using molecular techniques to analyze antibiotic resistance mutations and virulence factors.
  • Findings showed that 43.6% of H. pylori isolates were resistant to metronidazole, with significant links between resistance and virulence genes, suggesting that genetic factors may contribute to how the bacteria resist treatment.
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  • Chronic unilateral vestibular hypofunction (UVH) can greatly affect quality of life and lead to various debilitating symptoms; the study aimed to explore its causes, symptoms, and impact on patients.
  • A retrospective analysis of 251 UVH patients was conducted to assess different etiologies, clinical subtypes, and quality of life, identifying Menière's Disease as the most common cause, along with other conditions like BPPV and PPPD.
  • Over 80% of patients reported significant disability and around 20-25% experienced moderate-to-severe anxiety or depression, highlighting the need for personalized diagnostic and treatment approaches for managing chronic UVH.
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Background: Mental health problems among junior doctors in Malaysia pose a significant concern, as they not only adversely affect their overall well-being but also impact the quality of health services they provide. Therefore, it is important to implement interventions aimed at preserving their mental health. This study aimed to evaluate the effectiveness of the Sanubari Optimal Health Program (OHP) intervention in enhancing the mental well-being of junior doctors in Malaysia.

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Many countries have reported increase of TB incidence during the COVID-19 pandemic period, which demands dire attention as it may threaten global effort to end TB transmission. Services, are among many others, were disrupted by the COVID-19 pandemic during the years 2020 and 2021; but its impact on the TB transmission is not well understood. This retrospective population-based molecular and epidemiological cohort study aims to determine the pattern of TB transmission in Kuala Lumpur (an area with high population density, moderate TB burden and high rates of COVID-19 cases) for the cohort of Pulmonary TB (PTB) cases notified from 2020 until 2021 and factors associated with clustering or clear epidemiologic linkage.

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Sensory processing disruptions are a core symptom of autism spectrum disorder (ASD) and other neurological disorders. The acoustic startle response and prepulse inhibition (PPI) are common metrics used to assess disruptions in sensory processing and sensorimotor gating in clinical studies and animal models. However, often there are inconsistent findings on ASD-related PPI deficits across different studies.

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  • Xanthomas are skin swellings caused by cholesterol and lipid accumulation, often linked to genetic lipid disorders like familial hypercholesterolemia (FH).
  • An 11-year-old girl presented with multiple painless, yellowish masses that had been growing for 4 years, with lab tests confirming high cholesterol levels, leading to a diagnosis of Homozygous FH and subsequent surgical removal of the xanthomas.
  • Early diagnosis and treatment of xanthomas are crucial as they can signal underlying hypercholesterolemia, helping to prevent severe complications.
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Purpose: There is no standardized best method on monitoring of patients with gestational diabetes on diet modification in the country. This study aims to investigate the optimum method of self-monitoring blood glucose.

Methods: This is a randomized clinical trial in a single tertiary centre involving patients with gestational diabetes mellitus (GDM) diagnosed based on NICE guideline on diet modification.

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A highly accurate, rapid, portable, and robust platform for detecting serovar Typhi ( Typhi) is crucial for early-stage diagnosis of typhoid to avert and control the outbreaks of this pathogen, which threaten global public health. This study presents a proof-of-concept for our developed label-free electrochemical DNA biosensor system for Typhi detection, which employs a printed circuit board gold electrode (PCBGE), integrated with a portable potentiostat reader. Initially, the functionalized DNA biosensor and target detection were characterized using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) methods using a benchtop potentiostat.

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Tilapia lake virus (TiLV) presents a substantial threat to global tilapia production. Despite the development of numerous cell lines for TiLV isolation and propagation, none have been specifically derived from red hybrid tilapia ( spp.).

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Background: Human hemoglobin of G-Makassar and hemoglobin E (Hb E) are hemoglobin variants that affect Beta (β) globin. Hb G-Makassar is a very rare variant while Hb E is estimated to affect at least one million people worldwide. Both Hb G-Makassar and Hb E can be inherited in the heterozygous, homozygous or compound heterozygous state.

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Gallium-based liquid metals (GaLMs) have garnered monumental attention from the scientific community due to their diverse actuation characteristics. These metals possess remarkable characteristics, including high surface tension, excellent electrical and thermal conductivity, phase transformation behaviour, minimal viscosity and vapour pressure, lack of toxicity, and biocompatibility. In addition, GaLMs have melting points that are either lower or near room temperature, making them incredibly beneficial when compared to solid metals since they can be easily deformed.

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Squamous papilloma of the oral cavity is frequently seen in adult patients and is typically presented as painless exophytic granular or cauliflower-like lesions over the tongue, floor of the mouth, palate, uvula, lips, and faucial pillars. Most of the lesions are solitary and grow rapidly to about 0.5 cm.

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Identifying highly stable, cost-effective, platinum-free, and efficient electrocatalysts for the oxygen reduction reaction (ORR) remains a formidable challenge. The ORR is important for advancing fuel cell and zinc-air battery (ZAB) technologies towards cost-efficiency and environmental sustainability. This work presents the utilization of economically viable materials through a straightforward synthesis process, exhibiting the development of efficient MoC/FeC-NC catalysts ingeniously derived from phosphomolybdic acid (PMA) and iron phthalocyanine (FePc).

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Background: Humerus shaft fractures are common in orthopaedic practice. The emphasis in treatment has shifted from prolonged immobilisation to early mobilisation and internal fixation when needed for a quicker return to normal function. Internal fixation methods include plate osteosynthesis and intramedullary nailing.

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Introduction: The presence of a metal foreign body (FB) in the lungs can be a major contributor to pulmonary embolism. FB pulmonary embolism is a rare condition and difficult to diagnose due to its variable clinical presentations.

Case Presentation: This article presents a case of a 34-year-old male presented to our emergency department after getting injured with a FB fragment entering the upper right thigh.

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We report a rare case of high-volume training-related myopericarditis. A male, 18 years old, elite road bicycle racing cyclist with high-volume training of 1,000 km per week for >7 years, presented with progressively worsening exertional breathlessness, reduced effort tolerance, and one episode of cardiac syncope. The symptoms were present prior to the coronavirus disease 2019 pandemic but made worse with the sudden increase in the volume of training after lockdown periods in preparation for competition.

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Traumatic ulcerative granuloma with stromal eosinophilia is a reactive, self-limiting ulcer within the oral cavity; however, clinically, it mimics a malignant ulcer. Here, we report the case of a 13-year-old boy who presented with a painful solitary indurated ulcer at the lower lip for a week. Histopathological examination revealed an ulcerated lesion with significant infiltration of eosinophils, small lymphocytes, and large lymphoid cells.

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Haemoglobin (Hb) G-Makassar is a rare Hb variant. It presents a diagnostic challenge as it imitates sickle Hb (Hb S) in standard electrophoresis and high-performance liquid chromatography assays requiring DNA analysis to confirm diagnosis. Both have point mutations in codon 6, exon 1 in the β-globin () gene with different pathogenicities.

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Nasal dermoid cyst is a rare benign lesion. The mainstay of treatment for a nasal dermoid cyst is surgical excision, which aims to remove the cyst and associated structures to prevent recurrence. We report a case of a 30-year-old man with nasal dermoid cyst, without intranasal or intracranial extension.

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