Publications by authors named "Mahdi Alqahtani"

Article Synopsis
  • Sleep-disordered breathing (SDB) is a serious health issue affecting children in the Aseer Region of Saudi Arabia, with this study focusing on its prevalence and connection to orofacial symptoms among primary school children.* -
  • A survey of 307 children aged 6 to 12 years revealed that 63.5% exhibited orofacial symptoms, while 44.3% showed signs of sleep apnea, primarily snoring; notably, no significant correlation between age and these symptoms was found.* -
  • The study highlights the need for more research on therapeutic interventions for SDB, along with awareness initiatives to improve health and quality of life for affected children in this region.*
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Article Synopsis
  • Food allergies are a growing global health issue, especially for parents managing allergic conditions in their children, prompting a study on awareness and knowledge among mothers in Aseer, Saudi Arabia.
  • A survey of 400 mothers showed most were aged 31-40, well-educated, and primarily employed in government jobs, highlighting their demographic characteristics.
  • While many mothers were knowledgeable about food allergies, gaps in understanding their hereditary nature were noted; seafood was the most common allergenic food reported, along with various symptoms ranging from skin to gastrointestinal issues.
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Nanocomposites comprising plasmon active metal nanostructures and semiconductors have been used to control the charge states in the metal to support catalytic activity. In this context dichalcogenides when combined with metal oxides offer the potential to control charge states in plasmonic nanomaterials. Using a model plasmonic mediated oxidation reaction -amino thiophenol ↔ -nitrophenol, we show that through the introduction of transition metal dichalcogenide nanomaterial, reaction outcomes can be influenced, achieved through controlling the occurrence of the reaction intermediate dimercaptoazobenzene by opening new electron transfer routes in a semiconductor-plasmonic system.

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Background: This study is focused on establishing a relationship between poor muscle activity faced by obese individuals due to the change in stiffness of the intramuscular mass of the lower limb. This issue is also common among athletes and physically active teenagers.

Objective: The study is aimed at a subject assessment diagnosis technique named as Strain Elastography (SE) to measure muscle strain.

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A MXene-GaN-MXene based multiple quantum well photodetector was prepared on patterned sapphire substrate by facile drop casting. The use of MXene electrodes improves the responsivity and reduces dark current, compared with traditional Metal-Semiconductor-Metal (MSM) photodetectors using Cr/Au electrodes. Dark current of the device using MXene-GaN van der Waals junctions is reduced by three orders of magnitude and its noise spectral intensity shows distinct improvement compared with the traditional Cr/Au-GaN-Cr/Au MSM photodetector.

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Human body measurement data related to walking can characterize functional movement and thereby become an important tool for health assessment. Single-camera-captured two-dimensional (2D) image sequences of marker-less walking individuals might be a simple approach for estimating human body measurement data which could be used in walking speed-related health assessment. Conventional body measurement data of 2D images are dependent on body-worn garments (used as segmental markers) and are susceptible to changes in the distance between the participant and camera in indoor and outdoor settings.

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Background: This study aimed to investigate the relationship between stiffness of the bicep brachii muscle (BBM) and distal bicep tendon (DBT) and effects of weight lifting (pre- to post-workout changes) among groups with different body mass indexes (BMI).

Methods: Participants were divided into four groups according to BMI: A, underweight (< 18.5 kg/m); B, normal (18.

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Photoelectrochemical (PEC) water splitting is a promising clean route to hydrogen fuel. The best-performing materials (III/V semiconductors) require surface passivation, as they are liable to corrosion, and a surface co-catalyst to facilitate water splitting. At present, optimal design combining photoelectrodes with oxygen evolution catalysts remains a significant materials challenge.

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Multifunctional thin films which can display both photocatalytic and antibacterial activity are of great interest industrially. Here, for the first time, we have used aerosol-assisted chemical vapor deposition to deposit highly photoactive thin films of Cu-doped anatase TiO on glass substrates. The films displayed much enhanced photocatalytic activity relative to pure anatase and showed excellent antibacterial (vs and ) ability.

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Objectives: The aim of this study was to establish a relationship between quadriceps tendon stiffness and its properties and variations in the body mass index (BMI) and segmental mass.

Methods: This study was conducted in 3 groups according to their BMI (A, low [<18.5 kg/m ]; B, normal [18.

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This study aimed to investigate the electrical activity of two muscles located at the dorsal surface during Islamic prayer (Salat). Specifically, the electromyography (EMG) activity of the erector spinae and trapezius muscles during four positions observed while performing Salat, namely standing, bowing, sitting and prostration, were investigated. Seven adult subjects with an average age of 28.

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[Purpose] This study investigated the changes in the slope of EMG-time curves (relationship) at the maximal and different levels of dynamic (eccentric and concentric) and static (isometric) contractions. [Subjects and Methods] The subject was a 17 year-old male adolescent. The surface EMG signal of the dominant arm's biceps brachii (BB) was recorded through electrodes placed on the muscle belly.

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Background: The relationship between surface electromyography (EMG) and force have been the subject of ongoing investigations and remain a subject of controversy. Even under static conditions, the relationships at different sensor placement locations in the biceps brachii (BB) muscle are complex.

Objective: The aim of this study was to compare the activity and relationship between surface EMG and static force from the BB muscle in terms of three sensor placement locations.

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