Journal articles: 'Hair-work'

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Adanali, Gokhan, Dilek Senen, Murat Turegun, Asuman Tuncel, Bulent Erdogan, and Levent Albayrak. "Cryopreservation of Hair Follicles at -20C°: Can It Work in Staged Hair Transplantation." Aesthetic Plastic Surgery 26, no. 6 (November 2002): 465–69. http://dx.doi.org/10.1007/s00266-002-2041-7.

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Lee, Jong Min, Seon Hye Kim, Yoo Jung Kim, and Yong-mi Jin. "Study on Proposal of Men’s Styles Using Angkor Wat as the Motive." Journal of the Korean Society of Cosmetology 27, no. 4 (August 31, 2021): 957–65. http://dx.doi.org/10.52660/jksc.2021.27.4.957.

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Currently, Korea's cultural standards are very high in the world. In line with this heightened level, Korea's beauty industry is also at a high level. But the Barber industry in Korea is not like that. However the number of barbershops is expected to increase gradually as many hair salons do, and the level of barbershops is expected to improve. Therefore, we started this paper because it was determined that new attempts and suggestions of styles were needed for men's hair styles. In order to produce the work of this study, a total of four works were produced based on the theoretical basis of Angkor Wat's concept, the literature on hair tattoos, Internet data. The first work based on the motive of “Nāga” in Angkor Wat is expressed by combining a ducktail and a hair tattoo. The second work based on the “Mahābhārata” in Angkor Wat is expressed by combining a pompadour and a hair tattoo. The third work based on the tower in Phnom Bakheng is expressed by combining iron windings and a hair tattoo. The fourth work based on the central tower in Angkor Wat is expressed by combining iron techniques and hair tattoo. Based on the sculpting work, which is the link between architecture and men's hair, the possibility of creating a male hairstyle by combining hair tattoos was shown in this study, and Barber work was worth it compared to sculpture and other art.

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Бурмістенков, О. П., С. А. Демішонкова, and О. М. Степанчук. "ДОСЛІДЖЕННЯ ТЕМПЕРАТУРНИХ РЕЖИМІВ В ПРИСТРОЯХ ЕЛЕКТРОПОБУТОВОЇ ТЕХНІКИ." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 148, no. 4 (March 10, 2021): 48–58. http://dx.doi.org/10.30857/1813-6796.2020.4.4.

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The aim of the work is to improve the work of hair styling devices, which is aimed at increasing the efficiency of hair styling under the action of sufficiently high temperatures with the least damage to it. To achieve this goal, the following tasks were solved: the relationship between the physical properties of hair and temperature regimes of curling was analyzed; experimentally investigated the distribution of curling temperature during heating and cooling; the distribution of the temperature of the curling iron when heated with dry hair and with moist hair was experimentally studied. Methodology. The methods of mathematical modeling, methods of mathematical physics, methods of experimental researches with processing of results of experiment by means of a modern software product and computer equipment are used in the work. Findings. Analytical and experimental studies have shown the need for a uniform temperature field on the surface of the work surface to achieve the desired result. The necessity of temperature regulation in devices for work with hair is proven. Originality. The possibility of using the installation for experimental evaluation of temperature control in devices for working with hair is substantiated, which will significantly increase the time of continuous operation of the device and reduce electricity consumption. Practical value. A stand for research and analysis of different temperature regimes of electrical appliances has been developed. The thermostat circuit for temperature control in devices for work with hair is applied. It has been proven that you need to choose the temperature in relation to the condition and type of hair, so as not to cause great harm. Due to its small size, economic and technical indicators, this stand is easy to use when studying the temperature conditions in devices for working with hair in the work space, which contributes to more modern and demonstrative training. It is proposed to use the two-position law of temperature regulation for the surfaces of the working bodies.

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Sargsyan, Lusine, Thomas Hippe, Hartmut Manneck, and Volkmar Vill. "Tannin-Mordant Coloration with Matcha (camelia sinensis) and Iron(II)-Lactate on Human Hair Tresses." Molecules 26, no. 4 (February 5, 2021): 829. http://dx.doi.org/10.3390/molecules26040829.

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The aim of this work was to optimize our natural hair dyeing system which we described in our previous work and to compare with other dyeing systems. Therefore, we investigated concentration limits of matcha and mordant and compared this new dyeing method with commercial permanent systems on the market. Completely unpigmented hair tresses were dyed with matcha powder (camelia sinensis) and iron(II)-lactate. To investigate the wash fastness and concentration limits, the differently dyed hair tresses were spectrophotometrically measured. The comparison of the damage potential for which cysteic acid is an indicator was measured by NIR. The concentration of matcha and mordant are responsible for the intensity of the color results. The higher the matcha or the mordant concentration, the darker the color results of the dyed hair tresses. Hair damage of matcha mordant dyeing is comparable with results of commercial permanent hair coloration systems. Moreover, the results of wash fastness of matcha mordant dyed hair tresses is comparable and even better by tendency to permanent colored hair tresses.

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Jung, Woung－Kyung, and Gi-Hyoung Kwon. "A Study of Hair Cut Diagrams Using Antonio Gaudis Work." Korean Society of Beauty and Art 20, no. 2 (June 30, 2019): 87–105. http://dx.doi.org/10.18693/jksba.2019.20.2.87.

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Hanß, Stefan. "Face‐Work: Making Hair Matter in Sixteenth‐Century Central Europe." Gender & History 33, no. 2 (June 8, 2021): 314–45. http://dx.doi.org/10.1111/1468-0424.12538.

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Donahoo, Saran. "Why We Need a National CROWN Act." Laws 10, no. 2 (April 12, 2021): 26. http://dx.doi.org/10.3390/laws10020026.

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Discrimination and intersecting forms of oppression directed at Black women influence how they look, live, work, interact with others, and even view their bodies and identities. Black hair has been and remains a target of this discrimination and oppression by obligating Black women to strive toward White beauty norms. Still under consideration in several states, the Creating a Respectful and Open World for Natural Hair (CROWN) Act provides a legislative intervention to protect Black women (and men) from hair discrimination at work, during school, and as they go about their daily lives. This article examines the politics affecting Black hair. The data for this study came from semi-structured interviews with 22 Black women who define their hair as natural. The results indicate that racial history and stereotypes continue to create unachievable standards for Black hair; that Black women continue to encounter discrimination when embracing their natural hair; and that wearing Black natural hair is often an uplifting decision for the women who elect to do so. The fact that others continue to challenge and discriminate against Black natural in multiple venues confirms the need for a national CROWN Act.

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Rubel, Edwin W., Terance T. Tsue, Elizabeth C. Oesterle, and Edwin W. Rubel. "Hair Cell Regeneration in the Inner Ear." Otolaryngology–Head and Neck Surgery 111, no. 3P1 (September 1994): 281–301. http://dx.doi.org/10.1177/01945998941113p118.

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Hearing and balance disorders caused by the loss of inner ear hair cells Is a common problem encountered in otolaryngology-head and neck surgery. The postembryonic production of hair cells in cold-blooded vertebrates has been known for several decades, and recent studies in the avian inner ear after ototoxic drug and noise damage have demonstrated a remarkable capacity for both anatomic and functional recovery. The regeneration of sensory hair cells has been shown to be integral to this repair process. Current work is focusing on the cellular progenitor source of new hair cells and the trigger mechanism responsible for inducing hair cell regeneration. Preliminary studies suggest that reparative proliferation may also occur in the mammalian inner ear. Work in this field is moving at a rapid pace. The results thus far have yielded optimism that direct stimulation of hair cell production or transplantation of living hair cells may eventually become treatment modalities for the damaged human inner ear. These proposals would have been considered unrealistic less than 10 years ago, but they now have caught the full attention of both clinician and researcher.

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Tirtaadi, Tirtaadi. "Hair Pb Levels, Work Duration and Health Complaints, of Waste Officers on Temporary Dump Site (Study on Dumpster Temporary Dump Site Mulyorejo Surabaya)." JURNAL KESEHATAN LINGKUNGAN 9, no. 2 (July 27, 2018): 122. http://dx.doi.org/10.20473/jkl.v9i2.2017.122-134.

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Hazardous household waste containing lead in TPS Mulyorejo is a source of environmental contamination that can caused health effects in humans. Heavy metals in the body will accumulate in hair, bone and soft tissue. Continuous Pb exposure would cause impacts include neurological disorders, kidney function, reproductive system, haematopoietic system, and the nervous system. The aim of this study to hair Pb levels, duration of work and health complaints officer at the temporary dump site Mulyorejo Surabaya. In this study was used a descriptive design with cross-sectional approach. The sample was 15 officer of the transport dumper in TPS Mulyorejo Surabaya and drawn by simple random sampling technique. The independent variable was the hair Pb levels and work of duration. The dependent variable is the health complaints. Hair Pb levels on the waste workers were still in the normal range between 0.007 to 1.17 mg/Nm3, although normal hair Pb levels but officers waste feel a lot of health complaints. Period and duration of working hour a day will affect the pile of Pb in hair and health complaints. Many perceived health complaints include feeling weak, fatigue, shortness of breath, diarrhea, decreased appetite, feeling dizziness, throat irritation, dizziness and back pain. Its recommended that, DKP Surabaya and RT/RW increase cooperation in sorting and processing waste. For officers conduct periodic inspections to determine health problems early, eating nutritious foods, vitamins, and minerals to reduce the levels of Pb in the hair.

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Dick, Dr Angela Ngozi. "Identity and Hair Narrative in Adichie's Americanah." Journal of English Language and Literature 9, no. 3 (June 30, 2018): 859–64. http://dx.doi.org/10.17722/jell.v9i3.364.

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Although the social construction of the human hair varies from culture to culture, the symbolic function of hair varies from person to person. In Adichie’s Americanah, the characters are primarily defined by their hair before the construction of their race, career and personality. The human hair becomes the premise for brotherhood and sisterhood in. Many episodes take place in the salon, thereafter a person’s hair is qualified as either good or bad. The theoretical framework for this paper is New Historicism which interrogates social life and power relations among people in the society. In this work we conclude that Adichie tells the story of human hair not for its sake but to portray the problem of immigrants, religious fanaticism, disruption of academic calendar and the frustration therein, loveless marriage, the environment and other human conditions. Finally, the hair shows that every person is a complete human being first and foremost

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Feng, Ying, Ping Xu, Bosheng Li, Pengpeng Li, Xing Wen, Fengying An, Yan Gong, et al. "Ethylene promotes root hair growth through coordinated EIN3/EIL1 and RHD6/RSL1 activity in Arabidopsis." Proceedings of the National Academy of Sciences 114, no. 52 (December 12, 2017): 13834–39. http://dx.doi.org/10.1073/pnas.1711723115.

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Root hairs are an extensive structure of root epidermal cells and are critical for nutrient acquisition, soil anchorage, and environmental interactions in sessile plants. The phytohormone ethylene (ET) promotes root hair growth and also mediates the effects of different signals that stimulate hair cell development. However, the molecular basis of ET-induced root hair growth remains poorly understood. Here, we show that ET-activated transcription factor ETHYLENE-INSENSITIVE 3 (EIN3) physically interacts with ROOT HAIR DEFECTIVE 6 (RHD6), a well-documented positive regulator of hair cells, and that the two factors directly coactivate the hair length-determining gene RHD6-LIKE 4 (RSL4) to promote root hair elongation. Transcriptome analysis further revealed the parallel roles of the regulator pairs EIN3/EIL1 (EIN3-LIKE 1) and RHD6/RSL1 (RHD6-LIKE 1). EIN3/EIL1 and RHD6/RSL1 coordinately enhance root hair initiation by selectively regulating a subset of core root hair genes. Thus, our work reveals a key transcriptional complex consisting of EIN3/EIL1 and RHD6/RSL1 in the control of root hair initiation and elongation, and provides a molecular framework for the integration of environmental signals and intrinsic regulators in modulating plant organ development.

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Gentile, Pietro, Maria G. Scioli, Alessandra Bielli, Barbara De Angelis, Ciro De Sio, Domenico De Fazio, Gabriele Ceccarelli, et al. "Platelet-Rich Plasma and Micrografts Enriched with Autologous Human Follicle Mesenchymal Stem Cells Improve Hair Re-Growth in Androgenetic Alopecia. Biomolecular Pathway Analysis and Clinical Evaluation." Biomedicines 7, no. 2 (April 8, 2019): 27. http://dx.doi.org/10.3390/biomedicines7020027.

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Platelet rich plasma (PRP) and Micrografts containing human follicle mesenchymal stem cells (HF-MSCs) were tried as a potential treatment for androgenetic alopecia (AGA). However, little to no work has yet to be seen wherein the bio-molecular pathway of HF-MSCs or PRP treatments were analyzed. The aims of this work are to report the clinical effectiveness of HF-MSCs and platelet-rich plasma evaluating and reviewing the most updated information related to the bio-molecular pathway. Twenty-one patients were treated with HF-MSCs injections and 57 patients were treated with A-PRP. The Wnt pathway and Platelet derived-growth factors effects were analyzed. 23 weeks after the last treatment with mean hair thickness increments (29 ± 5.0%) over baseline values for the targeted area. 12 weeks after the last injection with A-PRP mean hair count and hair density (31 ± 2%) increases significantly over baseline values. The increment of Wnt signaling in Dermal Papilla Cells evidently is one of the principal factors that enhances hair growth. Signaling from mesenchymal stem cells and platelet derived growth factors positively influences hair growth through cellular proliferation to prolong the anagen phase (FGF-7), inducing cell growth (ERK activation), stimulating hair follicle development (β-catenin), and suppressing apoptotic cues (Bcl-2 release and Akt activation).

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Beisel, Kirk W., Yesha Wang-Lundberg, Adel Maklad, and Bernd Fritzsch. "Development and evolution of the vestibular sensory apparatus of the mammalian ear." Journal of Vestibular Research 15, no. 5-6 (November 1, 2005): 225–41. http://dx.doi.org/10.3233/ves-2005-155-601.

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Herein, we will review molecular aspects of vestibular ear development and present them in the context of evolutionary changes and hair cell regeneration. Several genes guide the development of anterior and posterior canals. Although some of these genes are also important for horizontal canal development, this canal strongly depends on a single gene, Otx1. Otx1 also governs the segregation of saccule and utricle. Several genes are essential for otoconia and cupula formation, but protein interactions necessary to form and maintain otoconia or a cupula are not yet understood. Nerve fiber guidance to specific vestibular end-organs is predominantly mediated by diffusible neurotrophic factors that work even in the absence of differentiated hair cells. Neurotrophins, in particular Bdnf, are the most crucial attractive factor released by hair cells. If Bdnf is misexpressed, fibers can be redirected away from hair cells. Hair cell differentiation is mediated by Atoh1. However, Atoh1 may not initiate hair cell precursor formation. Resolving the role of Atoh1 in postmitotic hair cell precursors is crucial for future attempts in hair cell regeneration. Additional analyses are needed before gene therapy can help regenerate hair cells, restore otoconia, and reconnect sensory epithelia to the brain.

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Embi, Abraham A. "EVIDENCE OF TELEPORTED BIOELECTROMAGNETIC ENERGY TRANSFER IN A HUMAN MINIORGAN CAUSING DELAY IN CRYSTALLIZATION." International Journal of Research -GRANTHAALAYAH 8, no. 6 (July 4, 2020): 156–62. http://dx.doi.org/10.29121/granthaalayah.v8.i6.2020.484.

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The purpose of this manuscript is to introduce an optical microscopy methodology documenting an organ inter-tissue parts bioelectromagnetic energy transfer, namely the human hair follicle transferring energy to a short-isolated cut hair shaft segment vertically placed within ≅ 1 mm distance in front of the hair follicle. The human hair has two main parts, follicle and shaft and classified as a miniorgan having its own cell divisions and metabolism. Both the follicle and shaft has been independently documented to emit and receive electromagnetic energy. This work shows a previously unrecognized property of the hair shaft, which is acting as an aerial receiver and conduit of Bioelectromagnetic Fields (BEMFs) emitted by the follicle. The received BEMF energy is transient and transferred via teleportation to be immediately discharged by the cut isolated shaft segment. The discharged crystallization imprint mimics the hair follicle proper BEMFs delaying advance of crystallization.

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Chen, Yuan, Qiong Li, Wan Ping Zhang, Jian Jie Cui, and Xiao Jian Wu. "Photoprotection of Asian Human Hair Exposed to Sunlight Radiation." Advanced Materials Research 821-822 (September 2013): 111–18. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.111.

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Protection effects of milk thistle extract, benzophenone-3, and non-ionic silicon to hair fibers were compared by measuring protein degradation, tryptophan degradation, lipid peroxidation, tensile characteristics and color change of hair exposed to irradiation. Experiment results indicate that milk thistle extract is more marked in protection of protein, lipid, breaking work in hair due to its strong antioxidant ability, while benzophenone-3 is the most effective in tryptophan protection. Color protection was significantly observed in silicone and milk thistle extract treated samples. However, the synergy of milk extract with non-ionic silicone emulsion and benzophenone-3 with non-ionic silicone for protecting hair was not encouraged.

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Stevenson, Jerry G., and Roger Williamson. "Testing for Drugs: Bathrooms or Barbershops?" Public Personnel Management 24, no. 4 (December 1995): 467–74. http://dx.doi.org/10.1177/009102609502400406.

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In an attempt to establish drug free work environments, an increasing number of public and private organizations are using some form of drug test. The most common method is urinalysis. However, in recent years, the chemical analysis of hair samples has emerged as an alternative. Hair analysis is more effective than urinalysis in identifying long-term drug use, and is less intrusive than the testing of bodily fluids. But there are disadvantages associated with hair testing: it is expensive, and cannot detect immediate impairment from drug use or recent drug use. Nor do researchers know whether environmental exposure to drugs will affect hair analysis tests. Only five percent of Fortune 500 companies and less than one percent of state governments currently allow the use of hair analysis to screen for drugs.

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HUANG, Xian, Tianzhi GONG, Mei LI, Cenghong HU, Dejian ZHANG, and Mufang SUN. "Root hair specification and its growth in response to nutrients." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 49, no. 2 (June 14, 2021): 12258. http://dx.doi.org/10.15835/nbha49212258.

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Plant root hairs are cylindrical tubular projections from root epidermal cells. They increase the root surface area, which is important for the acquisition of water and nutrients, microbe interactions, and plant anchorage. The root hair specification, the effect of root hairs on nutrient acquisition and the mechanisms of nutrients (calcium, iron, magnesium, nitrogen, phosphorus, and potassium) that affect root hair development and growth were reviewed. The gene regulatory network on root hair specification in the plant kingdom was highlighted. More work is needed to clone the genes of additional root hair mutants and elucidate their roles, as well as undertaking reverse genetics and mutant complementation studies to add to the current knowledge of the signaling networks, which are involved in root hair development and growth regulated by nutrients.

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De Tollenaere, Morgane, Emilie Chapuis, Pascale Auriol, Daniel Auriol, Amandine Scandolera, and Romain Reynaud. "Global Repigmentation Strategy of Grey Hair Follicles by Targeting Oxidative Stress and Stem Cells Protection." Applied Sciences 11, no. 4 (February 8, 2021): 1533. http://dx.doi.org/10.3390/app11041533.

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One of the most visible signs of hair ageing is greying of the hair, also known as canities. This hair disorder is mainly caused by oxidative stress. In preliminary work, we designed various models mimicking the impact of oxidative stress on hair pigmentation, showing an accumulation of reactive oxygen species (ROS) production and a decrease in the presence of melanocytes and melanoblasts, resulting in a decrease in hair pigmentation. A proteomic study on skin scalp explants was performed to identify the dysregulated biological pathways related to canities. We developed a smart active ingredient which has been tested on these biological pathways. We demonstrated that these negative effects were rectified in the presence of the ingredient, showing a reduction of ROS, protection of melanocyte reservoirs and reactivation of hair pigmentation. Finally, a clinical study was carried out on a panel of 44 male volunteers with grey hair. After 4 months, we evidenced a reduction in the proportion of grey hair and in the number of grey hairs/cm2 relative to Day 0. In conclusion, we clearly evidenced that oxidative stress is a key factor in triggering a cascade of events leading to a loss of hair pigmentation. We developed this active ingredient which is capable of restoring all the disrupted mechanisms and of providing hair repigmentation within only 4 months.

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Sheumaker, Helen. "“This Lock You See”: Nineteenth-Century Hair Work as the Commodified Self." Fashion Theory 1, no. 4 (November 1997): 421–45. http://dx.doi.org/10.2752/136270497779613620.

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Hudspeth, A. J. "How the ear's works work: mechanoelectrical transduction and amplification by hair cells." Comptes Rendus Biologies 328, no. 2 (February 2005): 155–62. http://dx.doi.org/10.1016/j.crvi.2004.12.003.

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Kang, Bok-Hui, So-Hee Moon, and Jae-Sook Lee. "Impact of Shared Hair Salon Perception on Work Environment and Turnover Intention." Korean Society of Beauty and Art 22, no. 1 (March 20, 2021): 89–100. http://dx.doi.org/10.18693/jksba.2021.22.1.89.

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Lin, Hao-Chiang Koong, and Min-Chai Hsieh. "The Establishment and Usability Evaluation on a Markerless AR-Based Hairstyle Simulation System." International Journal of Online Pedagogy and Course Design 2, no. 2 (April 2012): 100–109. http://dx.doi.org/10.4018/ijopcd.2012040107.

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In this work, the authors combine the AR and HCI techniques to develop a Markerless AR-based Hairstyle Simulation System (MARHSS). This system helps hair stylists to know well the expectation and need of customers. Before the hair cut, the customers can select their preferred hairstyles from MARHSS. Then, the system will simulate the hair style on the customer’s face through the AR-based image. After the system design, the System Usability Scale (SUS) with seventy-two participants were employed to evaluate the interface design of MARHSS. The research results showed that the system is usable; participants emotionally satisfied with the system; the system provides a good environment for hair stylists and customers to discuss the hairstyles.

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Viswanathan, G., V. G. Munshi, A. V. Ukidve, and K. Chandran. "Comparative Evaluation of Yarn Hairiness by Different Methods." Textile Research Journal 58, no. 8 (August 1988): 477–79. http://dx.doi.org/10.1177/004051758805800808.

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Using a rapid yarn hairiness tester, the Shirley yarn hairiness meter, this work has confirmed that for cotton yarns, the statistical distribution of the number of protruding ends of different lengths is exponential. The study indicates that, compared to the other hair length settings available on the hairiness meter, the recommended 3 mm hair length is suitable and advantageous. Further there is a high correlation between the Shirley hairiness meter and two other hairiness indices, the modified Jedryka and the Digital fibrograph, considered in this work.

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Dawid-Pać, Renata, Maria Urbańska, Ilona Dębosz, and Gerard Nowak. "Plants as potential active components in treatment of androgenetic alopecia." Herba Polonica 60, no. 1 (March 1, 2014): 49–56. http://dx.doi.org/10.2478/hepo-2014-0005.

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Summary Androgenetic alopecia is caused by the influence of sex hormones on hair follicles and by hereditary factors. Characteristic for that type of alopecia is shortening of the hair growth phase and elongation of the rest phase caused by disturbance of the process of transformation of testosterone into dihydrotestosterone. Treatment of that type of alopecia involves 5α-reductase inhibitors, antagonists of the androgenic receptor or stimulating proliferation of cells to induce the hair growth. A number of plant raw materials work that way, thus they can be used in treatment of this type of alopecia.

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A., BALJI Y., ADILBEKOV J. SH., WIŚNIEWSKI J., BEŁKOT Z., and ANUSZ K. "Development of a new method for identifying species affiliation based on forensic hair examination." Medycyna Weterynaryjna 75, no. 05 (2020): 6265–2020. http://dx.doi.org/10.21521/mw.6266.

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The aim of the research was to develop a method for determining the species affinity of animal hair by determining its melting temperature. The research material was selected from hair samples of livestock and wild animals. We investigated 170 hairs of 16 animal species and humans. The hair melting point was determined by an automated system for melting temperature determination Opti Melt (MPA100). In the present study, we suggest that species affiliation can be effectively determined by examining physical properties of hair, in particular by determining its melting temperature. The hair melting temperatures for different animal species are in different ranges, but the initial melting points for hair of certain animal species are similar. For example, the initial melting point for cat, sheep, hare, rabbit, and rat hair ranged from 100 to 111 ° C, and the hair of the wolf, bear, and fox began to melt at 139.2 to 141.2 ° C. The results of this research make it possible to determine the species affinity of animals according to their hair melting temperature, which had not been done before. The proposed method yields rapid results and can be used as an auxiliary method in ambiguous cases in which data obtained by microscopic examination are insufficient. It will greatly facilitate the work of forensic specialists, enriching the arsenal of available methods.

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Bassino, Eleonora, Franco Gasparri, and Luca Munaron. "Protective Role of Nutritional Plants Containing Flavonoids in Hair Follicle Disruption: A Review." International Journal of Molecular Sciences 21, no. 2 (January 14, 2020): 523. http://dx.doi.org/10.3390/ijms21020523.

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Hair loss is a disorder in which the hair falls out from skin areas such as the scalp and the body. Several studies suggest the use of herbal medicine to treat related disorders, including alopecia. Dermal microcirculation is essential for hair maintenance, and an insufficient blood supply can lead to hair follicles (HF) diseases. This work aims to provide an insight into the ethnohistorical records of some nutritional compounds containing flavonoids for their potential beneficial features in repairing or recovering from hair follicle disruption. We started from a query for “alopecia” OR “hair loss” AND “Panax ginseng C.A. Mey.“ (or other six botanicals) terms included in Pubmed and Web of Sciences articles. The activities of seven common botanicals introduced with diet (Panax ginseng C.A. Mey., Malus pumila Mill cultivar Annurca, Coffea arabica, Allium sativum L., Camellia sinensis (L.) Kuntze, Rosmarinum officinalis L., Capsicum annum L.) are discussed, which are believed to reduce the rate of hair loss or stimulate new hair growth. In this review, we pay our attention on the molecular mechanisms underlying the bioactivity of the aforementioned nutritional compounds in vivo, ex vivo and in vitro studies. There is a need for systematic evaluation of the most commonly used plants to confirm their anti-hair loss power, identify possible mechanisms of action, and recommend their best adoption.

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De La Torre, Hector A. Martinez, Kaelyn M. Ormsby, Benjamin T. Fuller, and Guaciara M. Santos. "14C Measurements Elucidate Isotopic Differences between Nails and Hair in Modern Humans." Radiocarbon 56, no. 1 (2014): 53–65. http://dx.doi.org/10.2458/56.17503.

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In forensic sciences, radiocarbon found in modern human nails and hair is evaluated to determine the year of death. However, 14C analyses presented herein of fingernails and hair from the same infant demonstrated 14C values of hair that were lower than would be expected (e.g. depleted relative to the fingernails by at least 10‰). These results prompted a series of 14C measurements on infant hair strands, fingernails, and infant shampoo, which suggested the presence of C contamination due to cosmetic products. To further evaluate these discrepancies, several hair strands and fingernail samples from multiple donors were collected, pretreated by several approaches, and measured using isotopic analysis (δ13C, δ15N, and C/N as well as 14C accelerator mass spectrometry). SEM images of the surface of chemically pretreated hair strands were also taken to inspect the performance of the chemical pretreatments applied. Our 14C and stable isotope results show that modern human hair is likely contaminated with fossil-fuel-derived carbon, which is found in most hair care products. Currently, the various chemical pretreatments available in the literature and presented herein show that it is not possible to completely remove foreign carbon contaminates. Thus, the human 14C and δ13C values between keratinous tissues (fingernails and hair) arc not in agreement. From these observations, it becomes apparent that isotopic interpretations using human hair should be used with extreme caution and additional work is needed for its use in forensic and dietary research.

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Brčić Karačonji, Irena, and Nataša Brajenović. "Evaluation of amphetamine-type stimulant abuse through hair analysis: Results from 12 years of work." Archives of Industrial Hygiene and Toxicology 65, no. 2 (June 1, 2014): 225–30. http://dx.doi.org/10.2478/10004-1254-65-2014-2514.

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AbstractHair analysis is a reliable tool for detecting long-term exposure to illegal drugs, including amphetaminetype stimulants, over periods from a few weeks to a few months, depending on the length of the hair used for analysis. Between 2000 and 2012, over 600 hair samples were analysed at the Institute for Medical Research and Occupational Health, Croatia (IMROH) for the presence of amphetamine-type stimulants. IMROH has used the same procedure for testing hair samples for amphetamine-type stimulants for over twelve years. It was found to be reliable for confirming repeated abuse of amphetamine-type stimulants. Gas chromatography/mass spectrometry (GC/MS) was used to determine amphetamine, methamphetamine, 3,4-methylenedioxyamphetamine (MDA), 3,4-methylenedioxymethamphetamine (MDMA-Ecstasy), and 3,4-methylenedioxyethylamphetamine (MDEA) in hair. Hair samples were either taken at the Institute, delivered by mail or a third person brought them to the laboratory. In most cases, the hair samples were tested anonymously. A total of 23 % of the tested samples were positive for one or more amphetamine-type stimulant. MDMA was the most frequently detected substance, whereas the most frequent combination was amphetamine with MDMA. Our results could indicate a trend in amphetamine-type stimulant abuse among young people in the Republic of Croatia.

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Ezawa, Yusuke, Shinobu Nagase, Akira Mamada, Shigeto Inoue, Kenzo Koike, and Takashi Itou. "Stiffness of Human Hair Correlates with the Fractions of Cortical Cell Types." Cosmetics 6, no. 2 (April 1, 2019): 24. http://dx.doi.org/10.3390/cosmetics6020024.

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(1) Background: The objective of this work was to elucidate the hair microstructure which correlates with the stiffness of human hair fibers. (2) Methods: Bending moduli of hair fibers were evaluated for the hair samples from 156 Japanese female subjects. Hair transverse sections were dual-stained with fluorescent dyes which can stain para- and ortho-like cortical cells separately, and observed under a fluorescence light microscope. Atomic force microscopy nanoindentation measurements were performed to examine the modulus inside macrofibrils. (3) Results: The difference in bending moduli between the maximum and the minimum values was more than double. The hair of high bending modulus was rich in para-like cortical cells and the bending modulus significantly correlated with the fraction of para-like cortical cells to the whole cortex. On the other hand, the elastic moduli inside macrofibrils were almost same for the para- and ortho-like cortical cells. (4) Conclusions: Hair bending modulus depends on the fractions of the constitutional cortical cell types. The contribution of the intermacrofibrillar materials, which differed in their morphologies and amounts of para- and ortho-like cortical cells, is plausible as a cause of the difference in the modulus of the cortical cell types.

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Macbeth, B. J., M. R. L. Cattet, G. B. Stenhouse, M. L. Gibeau, and D. M. Janz. "Hair cortisol concentration as a noninvasive measure of long-term stress in free-ranging grizzly bears (Ursus arctos): considerations with implications for other wildlife." Canadian Journal of Zoology 88, no. 10 (October 2010): 935–49. http://dx.doi.org/10.1139/z10-057.

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Human-caused landscape change negatively affects the sustainability of many wildlife populations. In Alberta, Canada, grizzly bears ( Ursus arctos L., 1758) live in one of the most populated and heavily exploited landscapes in which the species survives. Long-term physiological stress in individual animals may be the predominant mechanism linking landscape change with impaired wildlife population health. Hair cortisol concentration has been validated as a biomarker of long-term stress in humans and domestic animals; however, limited work has examined factors that may affect its measurement or interpretation. We have measured cortisol in as few as five guard hairs of a grizzly bear and have identified factors influencing hair cortisol concentration in this species. Hair cortisol varies with hair type, body region, and capture method. It is not influenced by colour, age, sex, environmental exposure (18 days), or prolonged laboratory storage (>1 year) and does not vary along the length of the hair shaft. Recommendations for prudent use of hair cortisol analysis in grizzly bears are discussed with implications for the development of hair cortisol concentration as a tool to monitor long-term stress in other wildlife.

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Brandy, Dominic A. "The O'Connor Tweezer Dexterity Test as a Screening Tool for Hiring Surgical Hair Restoration Assistants." American Journal of Cosmetic Surgery 12, no. 4 (December 1995): 313–16. http://dx.doi.org/10.1177/074880689501200406.

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Because the use of very large numbers of small hair-grafts has become the norm in hair transplantation, the surgical assistant who cuts and places the hair-grafts into the recipient sites has become a key figure in the operation. Because this activity requires tremendous dexterity and patience, hiring the right individuals to perform this work can be a formidable task. Recently, the author has researched the topic of dexterity tests and discovered an invaluable hand-eye coordination test (The O'Connor Tweezer Dexterity Test) that accurately determines whether or not an individual will be able to perform the task of hair-graft placement with speed and precision. Since utilizing this test during the interview process, it has been found to be a highly invaluable screening tool.

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Stenn, K. S., and R. Paus. "Controls of Hair Follicle Cycling." Physiological Reviews 81, no. 1 (January 1, 2001): 449–94. http://dx.doi.org/10.1152/physrev.2001.81.1.449.

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Nearly 50 years ago, Chase published a review of hair cycling in which he detailed hair growth in the mouse and integrated hair biology with the biology of his day. In this review we have used Chase as our model and tried to put the adult hair follicle growth cycle in perspective. We have tried to sketch the adult hair follicle cycle, as we know it today and what needs to be known. Above all, we hope that this work will serve as an introduction to basic biologists who are looking for a defined biological system that illustrates many of the challenges of modern biology: cell differentiation, epithelial-mesenchymal interactions, stem cell biology, pattern formation, apoptosis, cell and organ growth cycles, and pigmentation. The most important theme in studying the cycling hair follicle is that the follicle is a regenerating system. By traversing the phases of the cycle (growth, regression, resting, shedding, then growth again), the follicle demonstrates the unusual ability to completely regenerate itself. The basis for this regeneration rests in the unique follicular epithelial and mesenchymal components and their interactions. Recently, some of the molecular signals making up these interactions have been defined. They involve gene families also found in other regenerating systems such as fibroblast growth factor, transforming growth factor-β, Wnt pathway, Sonic hedgehog, neurotrophins, and homeobox. For the immediate future, our challenge is to define the molecular basis for hair follicle growth control, to regenerate a mature hair follicle in vitro from defined populations, and to offer real solutions to our patients' problems.

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García-González, Judith, Jozef Lacek, and Katarzyna Retzer. "Dissecting Hierarchies between Light, Sugar and Auxin Action Underpinning Root and Root Hair Growth." Plants 10, no. 1 (January 7, 2021): 111. http://dx.doi.org/10.3390/plants10010111.

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Plant roots are very plastic and can adjust their tissue organization and cell appearance during abiotic stress responses. Previous studies showed that direct root illumination and sugar supplementation mask root growth phenotypes and traits. Sugar and light signaling where further connected to changes in auxin biosynthesis and distribution along the root. Auxin signaling underpins almost all processes involved in the establishment of root traits, including total root length, gravitropic growth, root hair initiation and elongation. Root hair plasticity allows maximized nutrient uptake and therefore plant productivity, and root hair priming and elongation require proper auxin availability. In the presence of sucrose in the growth medium, root hair emergence is partially rescued, but the full potential of root hair elongation is lost. With our work we describe a combinatory study showing to which extent light and sucrose are antagonistically influencing root length, but additively affecting root hair emergence and elongation. Furthermore, we investigated the impact of the loss of PIN-FORMED2, an auxin efflux carrier mediating shootward auxin transporter, on the establishment of root traits in combination with all growth conditions.

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García-González, Judith, Jozef Lacek, and Katarzyna Retzer. "Dissecting Hierarchies between Light, Sugar and Auxin Action Underpinning Root and Root Hair Growth." Plants 10, no. 1 (January 7, 2021): 111. http://dx.doi.org/10.3390/plants10010111.

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Plant roots are very plastic and can adjust their tissue organization and cell appearance during abiotic stress responses. Previous studies showed that direct root illumination and sugar supplementation mask root growth phenotypes and traits. Sugar and light signaling where further connected to changes in auxin biosynthesis and distribution along the root. Auxin signaling underpins almost all processes involved in the establishment of root traits, including total root length, gravitropic growth, root hair initiation and elongation. Root hair plasticity allows maximized nutrient uptake and therefore plant productivity, and root hair priming and elongation require proper auxin availability. In the presence of sucrose in the growth medium, root hair emergence is partially rescued, but the full potential of root hair elongation is lost. With our work we describe a combinatory study showing to which extent light and sucrose are antagonistically influencing root length, but additively affecting root hair emergence and elongation. Furthermore, we investigated the impact of the loss of PIN-FORMED2, an auxin efflux carrier mediating shootward auxin transporter, on the establishment of root traits in combination with all growth conditions.

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Opie, Tina. "Let My Hair Be Me: An Investigation of Employee Authenticity and Organizational Appearance Policies Through the Lens of Black Women’s Hair." Fashion Studies 1, no. 1 (2018): 1–28. http://dx.doi.org/10.38055/fs010111.

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Appearance policies — formal or informal dress codes that set organizational expectations for how employees “should” appear at work (Pratt & Rafaeli, 1997; Society for Human Resource Management, 2016) are typically based on Eurocentric ideals of professionalism (Bell & Nkomo, 2003). Appearance policies are often enforced by well-intentioned managers striving to foster a professional workforce (Society for Human Resource Management, 2016), yet such policies may conflict with increasing organizational efforts to encourage employee authenticity. The current paper investigates how men, the primary decision-makers in the workplace, evaluate Black women’s Afrocentric hair at work. The paper focuses on Black women because they are often at the bottom of the workplace hierarchy (Catalyst, 2016b) and are confronted with both gender and racial inequities. The paper focuses on hair because it is a visual display of identity (Opie & Phillips, 2015) and fashion (Barnard, 2014) that may reflect how individuals choose to express their authenticity (Opie & Freeman, 2017). Further, hair is subjectively evaluated based on societal notions of professionalism, making Black women’s hair a helpful, intersectional lens through which to investigate the gendered and racialized bounds of workplace appearance.

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McConney, Michael E., Clemens F. Schaber, Michael D. Julian, William C. Eberhardt, Joseph A. C. Humphrey, Friedrich G. Barth, and Vladimir V. Tsukruk. "Surface force spectroscopic point load measurements and viscoelastic modelling of the micromechanical properties of air flow sensitive hairs of a spider ( Cupiennius salei )." Journal of The Royal Society Interface 6, no. 37 (December 16, 2008): 681–94. http://dx.doi.org/10.1098/rsif.2008.0463.

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The micromechanical properties of spider air flow hair sensilla (trichobothria) were characterized with nanometre resolution using surface force spectroscopy (SFS) under conditions of different constant deflection angular velocities (rad s −1 ) for hairs 900–950 μm long prior to shortening for measurement purposes. In the range of angular velocities examined (4×10 −4 −2.6×10 −1 rad s −1 ), the torque T (Nm) resisting hair motion and its time rate of change (Nm s −1 ) were found to vary with deflection velocity according to power functions. In this range of angular velocities, the motion of the hair is most accurately captured by a three-parameter solid model, which numerically describes the properties of the hair suspension. A fit of the three-parameter model (3p) to the experimental data yielded the two torsional restoring parameters, S 3p =2.91×10 −11 Nm rad −1 and =2.77×10 −11 Nm rad −1 and the damping parameter R 3p =1.46×10 −12 Nm s rad −1 . For angular velocities larger than 0.05 rad s −1 , which are common under natural conditions, a more accurate angular momentum equation was found to be given by a two-parameter Kelvin solid model. For this case, the multiple regression fit yielded S 2p =4.89×10 −11 Nm rad −1 and R 2p =2.83×10 −14 Nm s rad −1 for the model parameters. While the two-parameter model has been used extensively in earlier work primarily at high hair angular velocities, to correctly capture the motion of the hair at both low and high angular velocities it is necessary to employ the three-parameter model. It is suggested that the viscoelastic mechanical properties of the hair suspension work to promote the phasic response behaviour of the sensilla.

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Mason, Ginny, Musa Mayer, Sandra M. Swain, Peter Kaufman, Debu Tripathy, Sara A. Hurvitz, Joyce O'Shaughnessy, et al. "Experience and impact of alopecia in patients (pts) with HER2+ metastatic breast cancer (MBC) in the SystHERs registry." Journal of Clinical Oncology 35, no. 8_suppl (March 10, 2017): 239. http://dx.doi.org/10.1200/jco.2017.35.8_suppl.239.

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239 Background: Although alopecia is common with systemic chemotherapy, its psychological impact is often overlooked in treatment (tx) decisions. We sought to better understand the impact of alopecia using data from SystHERs, an observational registry of pts with HER2+ MBC. Methods: SystHERs enrolled pts ≥ 18 years within 6 mos of an MBC diagnosis. Pt-reported outcomes are assessed quarterly. The Alopecia Patient Assessment (APA, Genentech) is a validated instrument measuring the incidence of hair loss in the prior 3 mos and the impact of hair loss in the prior 7 days. The APA includes 5 items scored on a 5-point scale (total range: 1–25). Higher scores indicate greater impact. Pts completed the APA within 30–90 days of initial MBC tx. Subgroups with no hair loss, hair loss without impact, or impactful hair loss were compared descriptively. Results: As of June 3, 2016, 591 of 976 pts were eligible for this analysis. Of these, 175 (30%) reported no hair loss, 123 (21%) reported hair loss without impact, and 293 (50%) reported impactful hair loss within 30–90 days of initial MBC tx. Respectively, 23% (41/175), 82% (101/123), and 79% (231/293) were on active chemotherapy, most commonly docetaxel (39% [16/41], 66% [67/101], and 62% [144/231]) and paclitaxel (5% [2/41], 27% [27/101], and 23% [54/231]). Median time from initial chemotherapy tx to APA was 55, 70, and 64 days. Of all pts with no hair loss, 39% had de novo MBC vs 56% of pts with hair loss but no impact and 55% with impactful hair loss. Relative to the no-hair-loss and hair-loss-but-no-impact subgroups, the subgroup with impactful hair loss was younger (median 57 and 59 vs 54 years, respectively) and had more pts with ≥ 2 metastatic sites (51% and 54% vs 63%) and visceral metastases (59% and 63% vs 69%). The median total APA score for pts with impactful hair loss was 8.8 (IQR 7.0–12.5). Conclusions: Of pts reporting hair loss, 79–82% were receiving systemic chemotherapy. Pts with impactful hair loss may have had greater disease burden. Alopecia impacted self-image and embarrassment more than work or social functioning. Clinical trial information: NCT01615068. [Table: see text]

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Tkachenko, Anna V. "Formatting knowledge about the English attributive collocations (on the example of cognitive matrix HAIR BEAUTY construction)." Neophilology, no. 22 (2020): 318–27. http://dx.doi.org/10.20310/2587-6953-2020-6-22-318-327.

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The question of formatting knowledge with regard to certain linguistic structures is currently relevant in cognitive linguistics. This research is devoted to theoretical and practical understanding of formatting knowledge applied to attributive collocations in the English language. The purpose of this work is to describe the format of knowledge behind the English attributive collocations representing the cognitive matrix HAIR BEAUTY. The study of such cognitive structures is impossible without the use of appropriate methods of analysis. In this work, the cognitive matrix HAIR BEAUTY is considered through the prism of the cognitive-matrix analysis that led to certain conclusions. First, the cognitive matrix HAIR BEAUTY is a multi-level format of knowledge which may include various conceptual and thematic areas that can act as independent matrix structures on closer examination. Second, the knowledge about attributive collocations contained in the described format allows a person to access the interfaces of conceptual and thematic areas within the HAIR BEAUTY format and information about attributive structures construction following the rules of the English language. The results contribute to further research in the field of formatting knowledge and can be used in courses on cognitive linguistics.

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Badolati, Nadia, Eduardo Sommella, Gennaro Riccio, Emanuela Salviati, Dimitri Heintz, Sara Bottone, Emery Di Cicco, et al. "Annurca Apple Polyphenols Ignite Keratin Production in Hair Follicles by Inhibiting the Pentose Phosphate Pathway and Amino Acid Oxidation." Nutrients 10, no. 10 (October 2, 2018): 1406. http://dx.doi.org/10.3390/nu10101406.

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Patterned hair loss (PHL) affects around 50% of the adult population worldwide. The negative impact that this condition exerts on people’s life quality has boosted the appearance of over-the-counter products endowed with hair-promoting activity. Nutraceuticals enriched in polyphenols have been recently shown to promote hair growth and counteract PHL. Malus pumila Miller cv. Annurca is an apple native to Southern Italy presenting one of the highest contents of Procyanidin B2. We have recently shown that oral consumption of Annurca polyphenolic extracts (AAE) stimulates hair growth, hair number, hair weight and keratin content in healthy human subjects. Despite its activity, the analysis of the molecular mechanism behind its hair promoting effect is still partially unclear. In this work we performed an unprecedented metabolite analysis of hair follicles (HFs) in mice topically treated with AAE. The metabolomic profile, based on a high-resolution mass spectrometry approach, revealed that AAE re-programs murine HF metabolism. AAE acts by inhibiting several NADPH dependent reactions. Glutaminolysis, pentose phosphate pathway, glutathione, citrulline and nucleotide synthesis are all halted in vivo by the treatment of HFs with AAE. On the contrary, mitochondrial respiration, β-oxidation and keratin production are stimulated by the treatment with AAE. The metabolic shift induced by AAE spares amino acids from being oxidized, ultimately keeping them available for keratin biosynthesis.

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Paul, R., L. Tsanaclis, C. Murray, R. Boroujerdi, L. Facer, and A. Corbin. "Ethyl Glucuronide as a Long-term Alcohol Biomarker in Fingernail and Hair. Matrix Comparison and Evaluation of Gender Bias." Alcohol and Alcoholism 54, no. 4 (February 23, 2019): 402–7. http://dx.doi.org/10.1093/alcalc/agz015.

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Abstract Aims This work aimed to assess the performance of hair and fingernail ethyl glucuronide (EtG) measurement for use as a biomarker of alcohol consumption in persons with known drinking history across a range of drinking behaviours. Methods EtG concentrations were assessed from the hair and fingernails of 50 study participants. Alcohol consumption of the previous 90 days was assessed by participant interview using the alcohol timeline follow-back method. EtG concentration was determined using LC–MS-MS using a method which was validated and accredited to ISO/IEC 17025 standards. Results There was significant correlation between alcohol consumption and EtG concentrations found in hair and fingernail samples across the study group (n = 50). From participants testing positive for EtG (male n = 14, female n = 13) no significant difference was found between male and female EtG levels in either hair or fingernails. Across all participants there was no significant difference in hair or fingernail EtG concentration between male (n = 23) and females (n = 27). Conclusions Our results support the use of EtG to indicate alcohol consumption over the previous 90 days, or ~3 months as is the normal practice in hair analysis. The results confirm that fingernails can be a useful alternative matrix where hair samples are not available.

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Liberman, M. Charles. "Noise-induced and age-related hearing loss: new perspectives and potential therapies." F1000Research 6 (June 16, 2017): 927. http://dx.doi.org/10.12688/f1000research.11310.1.

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The classic view of sensorineural hearing loss has been that the primary damage targets are hair cells and that auditory nerve loss is typically secondary to hair cell degeneration. Recent work has challenged that view. In noise-induced hearing loss, exposures causing only reversible threshold shifts (and no hair cell loss) nevertheless cause permanent loss of >50% of the synaptic connections between hair cells and the auditory nerve. Similarly, in age-related hearing loss, degeneration of cochlear synapses precedes both hair cell loss and threshold elevation. This primary neural degeneration has remained a “hidden hearing loss” for two reasons: 1) the neuronal cell bodies survive for years despite loss of synaptic connection with hair cells, and 2) the degeneration is selective for auditory nerve fibers with high thresholds. Although not required for threshold detection when quiet, these high-threshold fibers are critical for hearing in noisy environments. Research suggests that primary neural degeneration is an important contributor to the perceptual handicap in sensorineural hearing loss, and it may be key to the generation of tinnitus and other associated perceptual anomalies. In cases where the hair cells survive, neurotrophin therapies can elicit neurite outgrowth from surviving auditory neurons and re-establishment of their peripheral synapses; thus, treatments may be on the horizon.

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Polledri, Elisa, Rosa Mercadante, Dario Consonni, and Silvia Fustinoni. "Cumulative Pesticides Exposure of Children and Their Parents Living near Vineyards by Hair Analysis." International Journal of Environmental Research and Public Health 18, no. 7 (April 2, 2021): 3723. http://dx.doi.org/10.3390/ijerph18073723.

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The aim of the present work was the application of hair biomonitoring to investigate exposure to pesticides in children and their parents residing in a vineyard area. Thirty-three children and 16 parents were involved in the study. Hair samples were self-collected before and after the application season (PRE- and POST-EXP samples). Information on study subjects and the use of pesticides in the area were obtained. Thirty-nine pesticides were analyzed by liquid chromatography tandem mass spectrometry, and thirty-one pesticides were quantifiable in at least one hair sample. Most frequently detected pesticides were chlorpyrifos, cycloxidim, dimethomorph, metalaxyl, spiroxamine, and tetraconazole. From PRE-EXP to POST-EXP the percentage of quantification and/or the concentration of pesticides increased; the concentration was typically in the low pg/mg hair range with comparable levels in children and parents. An inverse correlation was found between the total exposure to pesticides in POST-EXP hair samples and the distance between home and the treated fields (Spearman ρ = −0.380, p = 0.01). The results of this study show that the majority of the study pesticides were measured in the hair of subjects living in the close proximity of treated vineyards, supporting the determination of pesticides in hair for the purpose of biomonitoring cumulative exposure in the general population.

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Boero, Luis E., Valeria C. Castagna, Gonzalo Terreros, Marcelo J. Moglie, Sebastián Silva, Juan C. Maass, Paul A. Fuchs, Paul H. Delano, Ana Belén Elgoyhen, and María Eugenia Gómez-Casati. "Preventing presbycusis in mice with enhanced medial olivocochlear feedback." Proceedings of the National Academy of Sciences 117, no. 21 (May 11, 2020): 11811–19. http://dx.doi.org/10.1073/pnas.2000760117.

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“Growing old” is the most common cause of hearing loss. Age-related hearing loss (ARHL) (presbycusis) first affects the ability to understand speech in background noise, even when auditory thresholds in quiet are normal. It has been suggested that cochlear denervation (“synaptopathy”) is an early contributor to age-related auditory decline. In the present work, we characterized age-related cochlear synaptic degeneration and hair cell loss in mice with enhanced α9α10 cholinergic nicotinic receptors gating kinetics (“gain of function” nAChRs). These mediate inhibitory olivocochlear feedback through the activation of associated calcium-gated potassium channels. Cochlear function was assessed via distortion product otoacoustic emissions and auditory brainstem responses. Cochlear structure was characterized in immunolabeled organ of Corti whole mounts using confocal microscopy to quantify hair cells, auditory neurons, presynaptic ribbons, and postsynaptic glutamate receptors. Aged wild-type mice had elevated acoustic thresholds and synaptic loss. Afferent synapses were lost from inner hair cells throughout the aged cochlea, together with some loss of outer hair cells. In contrast, cochlear structure and function were preserved in aged mice with gain-of-function nAChRs that provide enhanced olivocochlear inhibition, suggesting that efferent feedback is important for long-term maintenance of inner ear function. Our work provides evidence that olivocochlear-mediated resistance to presbycusis-ARHL occurs via the α9α10 nAChR complexes on outer hair cells. Thus, enhancement of the medial olivocochlear system could be a viable strategy to prevent age-related hearing loss.

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Hofmann, D., G. Preuss, and C. Mätzler. "Evidence for biological shaping of hair ice." Biogeosciences 12, no. 14 (July 22, 2015): 4261–73. http://dx.doi.org/10.5194/bg-12-4261-2015.

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Abstract. An unusual ice type, called hair ice, grows on the surface of dead wood of broad-leaf trees at temperatures slightly below 0 °C. We describe this phenomenon and present physical, chemical, and biological investigations to gain insight in the properties and processes related to hair ice. Tests revealed that the biological activity of a winter-active fungus is required in the wood for enabling the growth of hair ice. We confirmed the fungus hypothesis originally suggested by Wegener (1918) by reproducing hair ice on wood samples. Treatment by heat and fungicide suppresses the formation of hair ice. Fruiting bodies of Asco- and Basidiomycota are identified on hair-ice-carrying wood. One species, Exidiopsis effusa (Ee), was present on all investigated samples. Both hair-ice-producing wood samples and those with killed fungus show essentially the same temperature variation, indicating that the heat produced by fungal metabolism is very small, that the freezing rate is not influenced by the fungus activity, and that ice segregation is the common mechanism of ice growth on the wood surface. The fungus plays the role of shaping the ice hairs and preventing them from recrystallisation. Melted hair ice indicates the presence of organic matter. Chemical analyses show a complex mixture of several thousand CHO(N,S) compounds similar to fulvic acids in dissolved organic matter (DOM). The evaluation reveals decomposed lignin as being the main constituent. Further work is needed to clarify its role in hair-ice growth and to identify the recrystallisation inhibitor.

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Hofmann, D., G. Preuss, and C. Mätzler. "Evidence for biological shaping of hair ice." Biogeosciences Discussions 12, no. 7 (April 2, 2015): 5293–332. http://dx.doi.org/10.5194/bgd-12-5293-2015.

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Abstract. An unusual ice type, called hair ice, grows on the surface of dead wood of broad-leaf trees at temperatures slightly below 0 °C. We describe this phenomenon and present physical, chemical, and biological investigations to gain insight in the properties and processes related to hair ice. Tests revealed that the biological activity of a winter-active fungus is required in the wood for enabling the growth of hair ice. We confirmed the fungus hypothesis originally suggested by Wegener (1918) by reproducing hair ice on wood samples. Treatment by heat and fungicide, respectively, suppresses the formation of hair ice. Fruiting bodies of Asco- and Basidiomycota are identified on hair-ice carrying wood. One species, Exidiopsis effusa (Ee), has been present on all investigated samples. Both hair-ice producing wood samples and those with killed fungus show essentially the same temperature variation, indicating that the heat produced by fungal metabolism is very small, that the freezing rate is not influenced by the fungus activity and that ice segregation is the common mechanism of ice growth at the wood surface. The fungus plays the role of shaping the ice hairs and to prevent them from recrystallisation. Melted hair ice indicates the presence of organic matter. Chemical analyses show a complex mixture of several thousand CHO(N,S)-compounds similar to fulvic acids in dissolved organic matter (DOM). The evaluation reveals decomposed lignin as the main constituent. Further work is needed to clarify its role in hair-ice growth and to identify the recrystallisation inhibitor.

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Shortt, Harriet. "Identityscapes of a Hair Salon: Work Identities and the Value of Visual Methods." Sociological Research Online 17, no. 2 (May 2012): 1–14. http://dx.doi.org/10.5153/sro.2690.

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Jeong, Ji-won, and Hyun Jin Jeon. "The Effects of Ego-resilience on Competence at Work among Beauty Hair Stylists." Korean Society of Beauty and Art 19, no. 1 (March 20, 2018): 147–61. http://dx.doi.org/10.18693/jksba.2018.19.1.147.

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Hill, Terrence D., and Christopher Bradley. "The Emotional Consequences of Service Work: An Ethnographic Examination of Hair Salon Workers." Sociological Focus 43, no. 1 (February 2010): 41–60. http://dx.doi.org/10.1080/00380237.2010.10571368.

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Hudspeth, A. J., Y. Choe, A. D. Mehta, and P. Martin. "Putting ion channels to work: Mechanoelectrical transduction, adaptation, and amplification by hair cells." Proceedings of the National Academy of Sciences 97, no. 22 (October 24, 2000): 11765–72. http://dx.doi.org/10.1073/pnas.97.22.11765.

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Yang, In-Ja, and Ki-Won Park. "A Study on Hair Design Applying Optical Art - Focused on Work Corn Rows." Korean Beauty Management Journal 8, no. 2 (December 31, 2020): 97–105. http://dx.doi.org/10.35883/kbmj.2020.8.2.1.6.

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Journal articles on the topic 'Hair-work'

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