Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 137 for “"Scalp"”.
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Human scalp hair: geometry, biochemistry, growth parameters and mechanical characteristics
Scalp hair is increasingly being used as a testing substrate for toxins and monitoring treatment adherence. The biochemistry of human hair is assumed to be similar; however, a recent study reported higher concentration of lipids in African hair. The effect of hair curvature, if any, on drug …
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Physiological High-Frequency Oscillations in Scalp EEGs Change During Brain Maturation
… brain region and sex. Using a dataset of 244 scalp EEG recordings from developmentally typical children, we found that HFOs follow a structured developmental trajectory, differ by sex and vary regionally across different stages of maturation. These findings were used to generate a reference …
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A comparison of radiotherapy techniques for the irradiation of the whole scalp
No abstract available.
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Scalp as a donor site in children: Is it really the best option?
… VII and VIII predominate in South Africa. The scalp with its abundance of hair is often used as a preferential donor site for small burns. Major reasons cited are that the donor site is hidden from view (covered by hair), rapidly epithelializes with minimal scarring and provides a relatively …
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The ageing hair follicle environment. Alterations in the female scalp and mesenchyme with age.
… study documents in situ changes in human female scalp skin of women (19-81 years (yrs)), and corresponding primary cultures of dermal fibroblast (DF) and dermal sheath (DS) cells. In situ, the papillary/reticular boundary was indistinguishable in young scalp, but delineated over 40yrs, with …
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An investigation of the association between structural proteins and lipids with scalp hair curvature
Scalp hair is increasingly being used as a non-invasive analytical sample in diagnostic and forensic medicine. However, variable sensitivities for detection of hair biomarkers were observed, whereby African hair generally incorporated higher drug levels than Asian and Caucasian hair types. It was …
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Development of 3D-Printed Patient Specific Bolus For Clinical Use In to tal Scalp Irradiation
<p>Total scalp irradiation (TSI) is a specialized radiation therapy technique that aims to deliver a uniform dose to the entire scalp. Original electron-based TSI techniques had limited homogeneity due to hot and cold spots created at field junctions due to the multiple matched fields that were …
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Development of a subcortical emphasized physical human head model for evaluation of deep brain source contribution to scalp EEG
… evaluation of deep brain source contribution to scalp EEG recordings. The novelty of the head model is attributed to its artificial neuronal sources being distributed not only in brain cortex, but also in subcortical region and deep brain. Results showed that LORETA method is capable of …
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Evaluating the impact of ultraviolet light on chemical and mechanical properties of human scalp hair through controlled and natural experiments
Introduction: Human hair fibres have been studied in a variety of fields for different applications. Examples include the use of hair as a medical testing substrate for diagnosis of pathologies, as a tool for forensic investigations, a substrate for cosmetic product development and as a precursor …
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Discrimination of alcoholics from non-alcoholics using supervised learning on resting EEG
… must be done by structured clinical interview. Scalp Electroencephalography (EEG) is a noisy, non-stationary signal produced by an aggregate of brain activity from neurons close to the scalp. Previous research has identified a relationship between information extracted from resting scalp EEG and …
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Does hair curl variation influence the efficacy of scalp cooling in the prevention of chemotherapy-induced alopecia in breast cancer patients? A randomized controlled pilot study
… a common side-effect of breast cancer treatment. Scalp cooling is reported to reduce CIA; however, it is unknown whether the efficacy is influenced by hair curvature. Methods: This 20-month randomized controlled trial recruited females, (18-65 years) with breast cancer to receive chemotherapy …
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Sensing the human alpha rhythm using a non-contact electroencephalographic (EEG) electrode
… the recording of bioelectrical potentials on the scalp due to neural current sources in the brain and are typically recorded using wet surface electrodes that make ohmic contact with the scalp surface using an electrolyte gel. Unfortunately, wet electrodes are intrusive to the user, problematic …
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Bringing MEG towards clinical applications
… led to developments towards principally new ‘on-scalp’ MEG systems. By eliminating the use of liquid helium and providing improved sensitivity via scanning closer to the brain, on-scalp MEG provides a promising future for MEG in clinical applications. In this work, theoretical and experimental …
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Computational Model of Electroconvulsive Therapy Considering Electric Field Dependent Skin Conductivity
… used to measure static impedance. We modeled two scalp layers: a superficial scalp layer with adaptive conductivity that increases with electric field up to a subject-specific maximum, and a deep scalp layer with a subject-specific fixed conductivity. We demonstrated that variation in these scalp …
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Electrophysiological Signatures of Spatial and Temporal Coding in Humans
… In Chapter 1, I provide a brief summary of scalp electroencephalogram (EEG), intracranial EEG, mobile EEG, hippocampal theta oscillations, frontal midline theta oscillations, and behavioral models for spatial and temporal cognition. In Chapter 2, I report the feasibility of recording …
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The roles of hepatocyte growth factor family members in androgen-regulation of human hair growth. A comparison of the expression of hepatocyte growth factor family members, HGF and MSP, and their receptors, c-Met and RON, in isolated hair follicles from normal and androgenetic alopecia (balding) scalp.
… terminal hair development e.g. beard and causing scalp balding, androgenetic alopecia. Hair disorders cause psychological distress but are poorly controlled. Androgens probably act by altering regulatory paracrine factors produced by the mesenchyme-derived dermal papilla. This study aimed to …
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The role of stress in the pathogenesis of Alopecia Areata: an objective assessment via hair cortisol level
… per month after OOHL, from the proximal (scalp near) end. Then three sections of three centimetres each were cut, two distally (representing the six-month period before OOHL) and one proximally (representing the three months post OOHL). In six of these cases a fourth or “current” section …
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Task Relevant Source Based Brain Computer Interface: Exploration of Independent Component Analysis Based Spatial Filtering with Reliability
… (EEG), when recorded from the scalp. EEG activity is quite small, that is very sensitive to noise. Therefore, BCI technologies have relied on finding noise and then removing it before feature extraction. Then, common spatial patterns or manually selecting channels are two common …
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Effects of Delayed Auditory Feedback on the Bereitschaftspotential
… indicate that the BP is present across the scalp in both the control condition and the DAF condition; however, the BP is reduced in the DAF condition. The scalp distribution maps indicate an increased negativity in the left frontal lobe in the DAF condition. These findings suggest that while …
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