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Artykuły w czasopismach na temat "Human hair fibers"
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Prasad K., Eshwara, Divakara Rao P. i Udaya Kiran C. "Experimental Studies on Behavior of Keratin Based Human Hair Fiber - A New Reinforcing Material for Composites". International Journal of Engineering & Technology 7, nr 4.5 (22.09.2018): 459. http://dx.doi.org/10.14419/ijet.v7i4.5.20207.
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Composite materials are formed by two or more constituents at macroscopic level. Type and form of fiber plays a vital role in imparting required properties to the composite. Many researchers contributed to the development of artificial fiber composites which are not environmental friendly in nature. Sizable research is also done in the area of natural fiber composites. Human hair is a non-biodegradable waste available in abundant quantity across the world, but is rarely explored for applications in engineering fields. In the present study, a review on behavior of human hair fibers was made to understand their suitability as a reinforcing material in composites. Morphology of the hair fibers is reviewed and the density of the hair fibers was determined using Archimedes principle. Tensile strength of the hair fibers is experimentally estimated. Chemical resistivity and burning tests were conducted. Tensile and flexural properties of hair fiber reinforced polyester composite were experimentally determined and compared.
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Boopathi, Sampath, V. Balasubramani, R. Sanjeev Kumar i G. Robert Singh. "The influence of human hair on kenaf and Grewia fiber-based hybrid natural composite material: an experimental study". Functional Composites and Structures 3, nr 4 (1.12.2021): 045011. http://dx.doi.org/10.1088/2631-6331/ac3afc.
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Abstract The demand for natural composite products to make various industrial and commercial products and protect the environment is continuously increasing. In this paper, a hybrid plant fiber composite (HPFC) is produced by a hand lay-up molding method using 64 wt% resin matrix and 36 wt% natural fibers (kenaf, Grewia and human hair). The influences of the weight of the natural fibers on tensile, flexural and impact strengths were investigated by the simplex lattice method. It was revealed that the percentage contribution of kenaf and human hair fibers to tensile strength, flexural and impact strengths is higher than that of Grewia fiber. The optimum weight percentage of fibers is 13.5 wt% kenaf, 15.3 wt% human hair and 7.2 wt% Grewia to produce a HPFC with desirable mechanical properties. The mechanical properties of the HPFC were compared with those of HPFC without human hair. The tensile, flexural, and impact strengths of the HPFC were 17.95%, 11.1% and 19.79% higher than the HPFC without human hair. The predicted optimum HPFC for making commercial products to fulfill consumer demand is recommended.
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Parasakthibala, Ms G., i Mrs A. S. Monisha. "A Review on Natural Fibers; Its Properties and Application Over Synthetic Fibers". International Journal for Research in Applied Science and Engineering Technology 10, nr 8 (31.08.2022): 1894–97. http://dx.doi.org/10.22214/ijraset.2022.46530.
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Abstract: Fibre is a long, thin strand or thread of material made by weaving or knitting threads together. Fibre is a hair like strand of material. A fibre is the smallest visible unit of any textile product. Fibres are flexible and may be spun into yarn and made into fabric. Natural fibres are taken from animals, vegetables or mineral sources. A few examples of widely used natural fibres include animal fibre such as wool and silk vegetables fibres, especially cotton and flax and asbestos, a mineral. Natural fibers are more important part in our human environment. Natural fibers are ecofriendly and inexpensive which are readily available in nature. In this chapter we discuss about the overview of natural fiber and their characteristic. this paper also deals with the impact of natural fibers over the synthetic fibers and also the application of natural fiber in various fields.
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Marschner, Stephen R., Henrik Wann Jensen, Mike Cammarano, Steve Worley i Pat Hanrahan. "Light scattering from human hair fibers". ACM Transactions on Graphics 22, nr 3 (lipiec 2003): 780–91. http://dx.doi.org/10.1145/882262.882345.
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Starcher, Barry, Ronnie L. Aycock i Charles H. Hill. "Multiple Roles for Elastic Fibers in the Skin". Journal of Histochemistry & Cytochemistry 53, nr 4 (kwiecień 2005): 431–43. http://dx.doi.org/10.1369/jhc.4a6484.2005.
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Dermal elastic fibers are believed to have a primary role in providing elastic stretch and recoil to the skin. Here we compare the structural arrangement of dermal elastic fibers of chick skin and different animal species. Most elastic fibers in chick skin are derived from cells that line the feather follicle and/or smooth muscle that connects the pterial and apterial muscle bundles to feather follicles. Elastic fibers in the dermis of animals with single, primary hair follicles are derived from cells lining the hair follicle or from the ends of the pili muscle, which anchors the muscle to the matrix or to the hair follicle. Each follicle is interconnected with elastic fibers. Follicles of animals with primary and secondary (wool) hair follicles are also interconnected by elastic fibers, yet only the elastic fibers derived from the primary follicle are connected to each primary follicle. Only the primary hair follicles are connected to the pili muscle. Human skin, but not the skin of other primates, is significantly different from other animals with respect to elastic fiber organization and probably cell of origin. The data suggest that the primary role for elastic fibers in animals, with the possible exception of humans, is movement and/or placement of feathers or hair.
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Thanon Dawood, Eethar, i Mafaz Hani Abdullah. "Behavior of non-reinforced and reinforced green mortar with fibers". Open Engineering 11, nr 1 (19.11.2020): 67–84. http://dx.doi.org/10.1515/eng-2021-0006.
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AbstractThe behavior of non-reinforced green mortar with fibers has been observed. Different green mortar mixes have been prepared using different percentages of waste glass powder (WGP), steel slag (SG) and silica fume (SF).The properties of flow, density, ultrasonic pulse velocity (UPV), compressive and flexural strengths have been tested for such green mortar in the first phase of the experimental work. The selected green mortar mix that gives good properties with the acceptable ranges of cement replacement by such cementitious materials has been utilized to achieve the second phase of the experimental work. Thus, the uses of human hair fibers, sisal fibers and stainless steel nails fibers in the form of individual and hybrid fibers system and testing for the same properties mentioned above have been performed. The third phase includes the cost estimation for the said mortar. Whereas, the last phase deals with analysis of the results using the integrated AHP and TOPSIS method for selection the best performance of the green mortar. The results of mono sisal fiber, human hair fiber and stainless nails fiber by 0.75, 0.75 and 2% of volume fraction respectively, exhibited the highest increase in compressive strength, flexural strength, UPV and density compared with other percentages.
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Kanwal, Hummaira, Muhammad Shahzad Aslam, Tayyaba Latif Mughal, Muhammad Asim i Reena Majid Memon. "Human Hair as Fiber Reinforced Concrete for Enhancement of Tensile Strength of Concrete". January 2020 39, nr 1 (1.01.2020): 63–70. http://dx.doi.org/10.22581/muet1982.2001.07.
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FRC (Fibre Reinforced Concrete) is fibrous material which increases its structural integrity, resists to explosive spalling in case of environmental affects, improves mix cohesion, improves ductility, reduces of steel reinforcement requirements and reduces the voids due to good stiffness. It contains short discrete fibres that are uniformly distributed. Mostly, natural fibers are the waste material which may have negative impact on environment. Synthetic fibres include steel fibres and glass fibres but natural fibres are coconut fibres and human hair fibres which tends to vary the properties to concrete. In addition, the character of FRC changes with varying concrete, fibre material, geometries, distribution, orientation and densities. Hair fibre concrete gives a practical, cost-effective and convenient method to avoid cracks and deficiencies regarding strength and proper mixing ratio which occurs at a longer period. Fibres have been used to reduce plastic shrinkage and drying shrinkage in concrete. In some structural elements, fibrous concrete can be used to reduce the cost of structure. Different fibres are used to improve the tensile strength of concrete. Human hair are strong in tension. Hair fibres can be utilized as a strengthening material. Hair fibre is a non-decay able matter and available at a cheap rate. Experiments have been performed on fibrous concrete cylinders containing various percentages of human hair which is 0, 0.5, 1 and 1.5% by the weight of cement. A total of seventy-two cylinders have been prepared with FRC having different %ages of hair content. Workability, compressive strength and split tensile strength have been checked at three curing ages i.e. 7, 14 and 28 days. This research will open a new wicket in the horizon of reuse of waste material efficiently in construction industry. This innovation in construction industry will save our natural resources and use fibre in productive and an effective approach.
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Naudin, Gregoire, Philippe Bastien, Sakina Mezzache, Erwann Trehu, Nasrine Bourokba, Brice Marc René Appenzeller, Jeremie Soeur i Thomas Bornschlögl. "Human pollution exposure correlates with accelerated ultrastructural degradation of hair fibers". Proceedings of the National Academy of Sciences 116, nr 37 (26.08.2019): 18410–15. http://dx.doi.org/10.1073/pnas.1904082116.
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Exposure to pollution is a known risk factor for human health. While correlative studies between exposure to pollutants such as polycyclic aromatic hydrocarbons (PAHs) and human health exist, and while in vitro studies help to establish a causative connection, in vivo comparisons of exposed and nonexposed human tissue are scarce. Here, we use human hair as a model matrix to study the correlation of PAH pollution with microstructural changes over time. Two hundred four hair samples from 2 Chinese cities with distinct pollution exposure were collected, and chromatographic-mass spectrometry was used to quantify the PAH-exposure profiles of each individual sample. This allowed us to define a group of less contaminated hair samples as well as a more contaminated group. Using transmission electron microscopy (TEM) together with quantitative image analysis and blind scoring of 82 structural parameters, we find that the speed of naturally occurring hair-cortex degradation and cuticle delamination is increased in fibers with increased PAH concentrations. Treating nondamaged hair fibers with ultraviolet (UV) irradiation leads to a more pronounced cortical damage especially around melanosomes of samples with higher PAH concentrations. Our study shows the detrimental effect of physiological concentrations of PAH together with UV irradiation on the hair microstructure but likely can be applied to other human tissues.
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Rudy, L., R. Sneath i M. Song. "High-voltage Electron Microscopy and 3-D reconstruction of human hair fiber ultrastructure". Proceedings, annual meeting, Electron Microscopy Society of America 47 (6.08.1989): 116–17. http://dx.doi.org/10.1017/s0424820100152550.
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The basic morphology of the non-keratinous regions of human hair fibers was studied using both conventional and high voltage electron microscopy. The non-keratinous regions of hair include the endocuticle, the cell membrane complex, and the nuclear remnants of the cortex. By characterizing these regions more clearly, the mechanisms by which external influences affect the hair can be understood. The nuclear remnants are surrounded by a cell membrane complex. Since thin sectioning often causes artifacts in these fragile structures, a three-dimensional reconstruction using serial, semi-thick sections was completed to reveal their morphological nature.Human hair fibers collected from a female subject, had not been treated with any chemically active processes. One centimeter samples were collected near the scalp region of the back of the head. The fibers were embedded in Epon-812. Serial, semi-thick sections, 0.25u thick, were sectioned and collected on copper slot, formvar-coated grids. Post-staining was completed with uranyl acetate and lead citrate. Sections were examined in an AEl EM7 Mk 1.2MV HVEM at an accelerating voltage of 1.0 MV.
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Ezawa, Yusuke, Shinobu Nagase, Akira Mamada, Shigeto Inoue, Kenzo Koike i Takashi Itou. "Stiffness of Human Hair Correlates with the Fractions of Cortical Cell Types". Cosmetics 6, nr 2 (1.04.2019): 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.
Rozprawy doktorskie na temat "Human hair fibers"
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Siyum, Samuel. "HUMAN HAIR KERATIN PROTEIN, HAIR FIBERS AND HYDROXYAPATITE (HA) COMPOSITE SCAFFOLD FOR BONE TISSUE REGENERATION". Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1421085686.
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Lawal, Abiola Samuel. "Removal of lead (pb2+) from water using keratin fibers from human hair". Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1627050685501336.
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Kaiser, Romy Franziska. "Kera-Plast : Exploring the plasticization of keratin-based fibers through compression molded human hair in relation to textile design methods". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23800.
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The project Kera-Plast aims to re-loop humans and nature by questioning the current systems and ethics through materiality. Human hair, currently considered as waste, functions as the base for the material exploration fabricated through thermo-compression molding. The flexible, short and opaque keratin-fibers get glued together with heat, pressure and water, acting as a plasticizer during the compression molding process. The results are stiff and remind on plastic due to shine and translucency. Aesthetics and function of the resulting material are controlled and designed by traditional textile techniques as knitting, weaving and non-woven processes. The material samples display the potential of Kera-Plast in the categories of 3D surface structures, patterns, shapeability and the influence of light. The findings also provide information about the parameters for designing with keratin fibers through the thermo-compression process. It can be concluded that despite all ethical and cultural factors, Kera-Plast and its fabrication method has the potential to add a sustainable, functional and aesthetical value to the design field and our future material consumption.
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Panayiotou, Helen. "Vibrational spectroscopy of human hair keratin fibres". Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36946/1/36946_Panayiotou_1998.pdf.
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This thesis is concerned with an investigation of human hair fibres, and is primarily directed towards forensic and cosmetic applications. Initially, a small study was conducted by the use of scanning electron microscopy in order to obtain a visual understanding of the human hair fibre. However, the main focus of the thesis is on the application of vibrational spectroscopy techniques for the investigation of single hair fibres (for forensic studies) or their bulk samples (for cosmetic studies).
Previous research directed towards the forensic field, failed to discriminate human hair fibres with the aid of FT-IR microspectroscopy. In the present study, the same technique was again utilised but the spectral data was interpreted by chemometrics. A number of different hypotheses were proposed and tested. Initially, it was concluded that the best sampling site is the middle section of a single hair fibre. It has been shown that the variation between hair fibres from two individual sources exceeds that of several hair fibres from the same source. In general, it was concluded that human, single, hair fibres can be discriminated on the basis of gender, race and treatment (single treatments and multiple treatments). Samples with known history were used to build a reference set, and blind samples were used for validation. Overall, a success rate of about 83% was achieved. From the present results, it is concluded that FT-IR micospectroscopy followed by chemometrics is a powerful technique for the discrimination of human hair single fibres. For the cosmetic studies, FT-Raman and FT-IR/PAS, were used as complementary techniques to investigate the oxidation of hair fibres by varying the treatment times for permanently dyed hair. FT-Raman was used to study the oxidation of the S-S band, while FT-IR/PAS was employed to study the S=O oxidation states. The spectra were interpreted by the use of chemometrics. Overall, the results observed for the FT-Raman study were similar to those observed in the FT-IR/PAS. Curve fitting analysis, indicated that approximately 11 % of the disulfide bonds remain broken, while the rest are reformed. In addition, the ratio between the cystine to cysteic acid being formed, is 1.8. These observations agree with comments in the literature.
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Barton, Paul Matthew John. "A forensic investigation of single human hair fibres using FTIR-ATR spectroscopy and chemometrics". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/41873/1/Paul_Barton_Thesis.pdf.
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Human hair fibres are ubiquitous in nature and are found frequently at crime scenes often as a result of exchange between the perpetrator, victim and/or the surroundings according to Locard's Principle. Therefore, hair fibre evidence can provide important information for crime investigation. For human hair evidence, the current forensic methods of analysis rely on comparisons of either hair morphology by microscopic examination or nuclear and mitochondrial DNA analyses. Unfortunately in some instances the utilisation of microscopy and DNA analyses are difficult and often not feasible. This dissertation is arguably the first comprehensive investigation aimed to compare, classify and identify the single human scalp hair fibres with the aid of FTIR-ATR spectroscopy in a forensic context.
Spectra were collected from the hair of 66 subjects of Asian, Caucasian and African (i.e. African-type). The fibres ranged from untreated to variously mildly and heavily cosmetically treated hairs. The collected spectra reflected the physical and chemical nature of a hair from the near-surface particularly, the cuticle layer. In total, 550 spectra were acquired and processed to construct a relatively large database. To assist with the interpretation of the complex spectra from various types of human hair, Derivative Spectroscopy and Chemometric methods such as Principal Component Analysis (PCA), Fuzzy Clustering (FC) and Multi-Criteria Decision Making (MCDM) program; Preference Ranking Organisation Method for Enrichment Evaluation (PROMETHEE) and Geometrical Analysis for Interactive Aid (GAIA); were utilised.
FTIR-ATR spectroscopy had two important advantages over to previous methods: (i) sample throughput and spectral collection were significantly improved (no physical flattening or microscope manipulations), and (ii) given the recent advances in FTIR-ATR instrument portability, there is real potential to transfer this work.s findings seamlessly to on-field applications.
The "raw" spectra, spectral subtractions and second derivative spectra were compared to demonstrate the subtle differences in human hair. SEM images were used as corroborative evidence to demonstrate the surface topography of hair. It indicated that the condition of the cuticle surface could be of three types: untreated, mildly treated and treated hair. Extensive studies of potential spectral band regions responsible for matching and discrimination of various types of hair samples suggested the 1690-1500 cm-1 IR spectral region was to be preferred in comparison with the commonly used 1750-800 cm-1. The principal reason was the presence of the highly variable spectral profiles of cystine oxidation products (1200-1000 cm-1), which contributed significantly to spectral scatter and hence, poor hair sample matching. In the preferred 1690-1500 cm-1 region, conformational changes in the keratin protein attributed to the α-helical to β-sheet transitions in the Amide I and Amide II vibrations and played a significant role in matching and discrimination of the spectra and hence, the hair fibre samples.
For gender comparison, the Amide II band is significant for differentiation. The results illustrated that the male hair spectra exhibit a more intense β-sheet vibration in the Amide II band at approximately 1511 cm-1 whilst the female hair spectra displayed more intense α-helical vibration at 1520-1515cm-1. In terms of chemical composition, female hair spectra exhibit greater intensity of the amino acid tryptophan (1554 cm-1), aspartic and glutamic acid (1577 cm-1). It was also observed that for the separation of samples based on racial differences, untreated Caucasian hair was discriminated from Asian hair as a result of having higher levels of the amino acid cystine and cysteic acid. However, when mildly or chemically treated, Asian and Caucasian hair fibres are similar, whereas African-type hair fibres are different.
In terms of the investigation's novel contribution to the field of forensic science, it has allowed for the development of a novel, multifaceted, methodical protocol where previously none had existed. The protocol is a systematic method to rapidly investigate unknown or questioned single human hair FTIR-ATR spectra from different genders and racial origin, including fibres of different cosmetic treatments. Unknown or questioned spectra are first separated on the basis of chemical treatment i.e. untreated, mildly treated or chemically treated, genders, and racial origin i.e. Asian, Caucasian and African-type. The methodology has the potential to complement the current forensic analysis methods of fibre evidence (i.e. Microscopy and DNA), providing information on the morphological, genetic and structural levels.
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Nogueira, Ana Carolina Santos. "Foto-degradação do cabelo : influencia da pigmentação da fibra". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250470.
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Orientador: Ines JoekesTese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-13T13:29:11Z (GMT). No. of bitstreams: 1 Nogueira_AnaCarolinaSantos_D.pdf: 2247460 bytes, checksum: aeee4e416431ea072521f3f9a542b8ca (MD5) Previous issue date: 2008
Resumo: A exposição solar causa diversos danos ao cabelo, sendo a mudança na cor um dos mais perceptíveis. Apesar do interesse em soluções para proteção da cor do cabelo, questiona-se ainda na literatura a sensibilidade de diferentes cabelos à foto-oxidação, danos causados pelas faixas de comprimentos de onda e o desempenho da melanina como uma proteção natural à fibra. Neste trabalho cabelos branco, preto, castanho-escuro, loiro e ruivo, melanina Sepia officinalis (eumelanina), bem como os aminoácidos tirosina e triptofano, foram expostos às radiações de lâmpada de vapor de mercúrio (filtrando-se ou não a radiação UVB) por até 2600 h, de arco-xenônio por até 300 h e à radiação IV por até 600 h. Na lâmpada de vapor de mercúrio, a exposição ocorreu a T=30°C e 50% de UR e na lâmpada de arco-xenônio a T=50°C e 50% de UR. Através de medidas de espectrofotometria de reflectância difusa, obtiveram-se, na ausência de radiação UVB, valores do parâmetro DE*= 20,0 e DE*=10,0 para os cabelos loiro e branco, respectivamente. Para a mesma dose de radiação (630 MJ/m), foram obtidos valores em torno de 3,0 para os cabelos castanho-escuro e preto. Contrariamente ao que é relatado na literatura, o cabelo branco ficou significativamente menos amarelo (Db*= -8,0) após ambas as condições de exposição na lâmpada de vapor de mercúrio. O cabelo loiro ficou menos amarelo (Db*=-3,0) na ausência da radiação UVB e mais amarelo (Db*=2,0) com radiação UVB. Os cabelos castanho escuro e preto ficaram mais vermelhos (Da*=2,0) e mais amarelos (Db*=3,0) após qualquer condição de exposição. O cabelo ruivo foi exposto a uma dose de radiação acumulada de até 150 MJ/m, sendo obtidos, na ausência de radiação UVB, valores de DE*= 5,0. O mesmo ficou mais amarelo (Db*=3,0) e não foi observada tendência de mudança no parâmetro Da*, após qualquer condição de exposição. Observou-se que o amarelecimento do cabelo branco é causado pela radiação IV (Db*=2,0). Esta mesma radiação não alterou a cor dos cabelos pigmentados. Os valores de absorbância de soluções de melanina, obtidos por espectroscopia no UV-VIS, mudaram significativamente após foto-exposição e foi possível correlacioná-los com a mudança de cor ocorrida no cabelo. Não foi possível, entretanto, obter uma correlação da alteração no triptofano com o amarelecimento do cabelo branco. Nos ensaios de resistência mecânica se observou, após foto-exposição (radiação UVB inclusa), redução na força máxima de 50%, 25%, 25% e 29% e redução no alongamento máximo de 20%, 15%, 14% e 9% para os cabelos branco, loiro, castanho-escuro e preto, respectivamente. Através dos resultados obtidos, correlacionou-se a mudança de cor com alterações em diferentes estruturas do cabelo, concluindo-se que a luminosidade, o amarelecimento e o avermelhamento estão relacionados primeiramente com a quantidade de melanina degradada, alterações nas proteínas e na melanina, respectivamente. Os ensaios de resistência mecânica mostraram que a ausência de melanina causa reduções bastante significativas na resistência do fio. Entretanto, a presença de uma quantidade muito maior de melanina no cabelo não o torna significativamente mais resistente à quebra
Abstract: Solar exposure causes hair damages. Changes on hair color are particularly noticeable. Although it is of general interest to find solutions for hair color protection, questions as the sensibility of different hair types to photo-oxidation, damages caused by the different wavelengths, and the efficacy of melanin as a natural hair color protector, are still open today. In this work, white, black, dark-brown, blond and red hairs, Sepia officinalis melanin, as well as the amino acids tyrosine and tryptophan were exposed to the radiations of a mercury vapor lamp (filtering or not UVB radiation) for up to 2600 h, of an arc-xenon lamp for up to 300 h and to IV radiation for up to 600 h. The temperature and relative humidity measured were T=30°C and 50% RH and T=50°C and 50% RH, for the mercury and xenon lamps, respectively. Using diffuse reflectance spectrophotometry, DE* values of 20.0 and 10.0 were obtained for blond and white hair, respectively, both hair irradiated in the absence of UVB radiation (accumulated irradiation dose = 630 MJ/m). Under the same conditions values of DE* around 3.0 for the black and dark-brown hairs were obtained. Opposite to what is commonly found in literature, the white hair turned significantly less yellow (Db*= -8.0) after exposure to the mercury vapor lamp. The blond hair turned less yellow (Db*= -3.0) in the absence of UVB radiation and yellowier (Db*= 2.0) when this radiation was included on the system. The dark-brown and black hairs turned redder (Da*= 2.0) and yellowier (Db*=3.0) after any exposure condition. The red hair was exposed to an irradiation dose up to 150 MJ/m. In the absent of UVB radiation, values of DE* around 5.0 were obtained. This hair turned yellowier (Db*=3.0) and no significant changes were observed on the Da* parameter, after any exposure condition. It was observed that the yellowness of white hair is caused by IV radiation (Db*= 2.0). This radiation did not alter the color of the pigmented hairs. The absorbance values of melanin solutions, obtained by UV-VIS spectroscopy, changed significantly after photo-oxidation and it was possible to correlate with the hair color changes. On the other hand, it was not possible to correlate changes in tryptophan solutions with the yellowness of white hair. The mechanical resistance experiments, after photo-oxidation with UVB radiation included, showed a reduction on break strength of 50%, 25%, 25% and 29% and a reduction on breaking elongation of 20%, 15%, 14% and 9% for white, blond, dark-brown and black hairs, respectively. From the results obtained it is possible to correlate hair color changes with the different hair pigmentation, concluding that the luminosity, the yellowness and the redness are linked mainly with the amount of melanin degraded, proteins and melanin damages, respectively. The results of mechanical resistance showed that the absence of melanin on hair causes significant decrease on the fiber resistance. On the other hand, a greater amount of melanin on hair content (e.g., dark-brown x blond hair) does not produce significant differences on its mechanical resistance
Doutorado
Físico-Química
Doutor em Ciências
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Tsernova, Inga. "jag försöker låta bli : en text om att bli till: om kroppar, hantverk, själ och Ande". Thesis, Konstfack, Ädellab, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7265.
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How can we live and work with craft as people in an age of global climate crisis? What must we change in order to work empathically and in harmony with our surrounding world? While not in need to actively ensure our survival, it is easy for us to forget to stay humble to our own needs, thus taking our lives and our surroundings for granted. We forget our bodies and we forget the bodies of others, animals and objects alike. We forget that we need each other in order to become. This text is a complementary exploration in how awareness of the soul, body and Spirit may help bring back a balance that we've lost in town based cultures of the west. I am looking for balance as I twist fibre into thread and into rope and as I suspend rock- and human bodies into temporary sculptures. I look for inspiration in phenomenologist thought, alchemy, shamanism and daoism, as well as in the active making of craft and art. My work centers around telling stories, crafting and material exploration as well as bodily awareness and performance. In the work, body and material are synonymous concepts drifting in and out of each other, enabling and shaping each other, becoming together. I am looking to meet my surroundings not always on my own terms, but by changing, adapting and compromising myself. This helps bring an awareness that unites me with the bodies around me, placing me not above but amidst constant becomings.
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Emídio, Elissandro Soares. "Desenvolvimento, validação e aplicação de microextração em fase sólida e microextração em fase líquida para determinação de canabinóides em cabelo humano por cromatografia em fase gasosa acoplada à espectrometria de massas no modo tandem". Universidade Federal de Sergipe, 2010. https://ri.ufs.br/handle/riufs/6060.
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The drug abuse has created several problems, moral, social and economical, and does not have borders of social class, educational and religious. The chemicaltoxicological
analysis is an indispensable resource to confirm the exposure of humans to these drugs. Depending on the purpose of analysis, various biological matrices can be used. Nowadays, hair is being recognized as a third fundamental biological sample for drug testing besides urine and blood. The collection of hair samples is simple, noninvasive being difficult its adulteration. The techniques based on the miniaturization of extraction have gained an important role on the world stage
in relation to conventional techniques. Among these techniques, stand out to solid phase microextraction (SPME) and liquid phase microextraction (LPME). In this work, a analytical method was developed for determination of 9-
tetrahydrocannabinol (9-THC), cannabidiol (CBD) and cannabinol (CBN) in human hair by headspace solid-phase microextraction (SPME) and hollow fiber liquid-phase
microextraction (HF-LPME) using gas chromatography coupled to mass spectrometry, operating in tandem mode (GC-MS/MS). Initially, in step sample preparation, a small mass of hair (10 mg) was decontaminated with petroleum ether
(2 mL) for 10 minutes of ultrasound application (3 times) followed by alkaline digestion (NaOH 1 M). A univariate design was used for the determination the better condictions of the parameters of HS-SPME: pH (10), temperature (90 °C), mass of hair (10 mg), extraction time (40 min), desorption time (10 min), ionic strength (Na2CO3), saturation time (10 min) and fiber (PDMS). For HF-LPME a fractional factorial design was used in the screening of some variables of this technique
followed by central composite design in the evaluation of optimal values of variables. The variables assessed and the optimum values of these were: extraction solvent (butyl acetate), donor phase pH (14), agitation speed (600 rpm), extraction time (20 min), ionic strength (6.8 % m/v) and acceptor phase volume (20 μL). The methods were submitted to the validation process showed good linearity with
coefficient of determination (R2) above 0.994. Precision was determined using two different concentrations (upper and lower limits of the linear range) and RSD values were between 6.6 and 16.4 % for HS-SPME and 4.4-13.7% for HF-LPME. Absolute recoveries were in the range 1.1 to 8.7 % (HS-SPME) and 4.4 to 8.9 % (HF-LPME). The limits of detection and quantification ranged between 7-62 pg mg-1 and from
0.0005-0.020 ng mg-1 to HS-LPME and HF-LPME, respectively. The 9-THC showed values of limits of quantification for both methods below the cut-off (LQ ≤
100 pg mg-1). Finally, the methods developed and validated were applied in determining CBD, 9-THC and CBN in hair samples of patients from a center of rehabilitation for drug addicts. The concentrations were in the range of LD-0.018 ng
mg-1 for CBD, LD-232 pg mg-1 for 9-THC and 9-300 pg mg-1 for CBN show the applicability of the method in monitoring studies. The concentration of cannabinoids in the samples ranged from limit of detection to 18 pg mg-1 for CBD, limit of
detection to 232 pg mg -1 for 9-THC and 9 to 300 pg mg-1 to CBN demonstrate the applicability of the method in monitoring studies.O consumo de drogas de abuso tem criado diversos problemas de ordem moral, social e econômica, além de não possuir fronteiras de classes sociais, educacionais e religiosas. A análise químico-toxicológica é um recurso indispensável para confirmar a exposição de pessoas a essas drogas. Dependendo da finalidade da análise, diversas matrizes biológicas podem ser utilizadas. Atualmente, o cabelo é reconhecido como uma das principais amostras biológicas para determinação de drogas, ao lado da urina e do sangue. A coleta de amostras de cabelo é um processo simples, não invasivo, sendo difícil sua adulteração. As técnicas baseadas na minituarização de extração têm ganhado um papel importante no cenário mundial frente às técnicas convencionais. Entre essas técnicas destacam-se a microextração em fase sólida (SPME) e a microextração em fase líquida (LPME). No presente trabalho, um método analítico foi desenvolvido para determinação de 9-tetraidrocanabinol (9- THC), canabidiol (CBD) e canabinol (CBN) em cabelo humano por microextração em fase sólida no modo headspace (HS-SPME) e microextração em fase líquida por fibra oca (HF-LPME) por cromatografia em fase gasosa e espectrometria de massas operando no modo tandem (GC-MS/MS). Na etapa de preparação da amostra, uma pequena massa de cabelo (10 mg) foi descontaminada com éter de petróleo (2 mL) por 10 minutos em ultra-som (3X), seguida de digestão alcalina (NaOH 1 mol L-1). Um planejamento univariado foi utilizado para o estudo das condições ótimas dos parâmetros de HS-SPME, tendo sido deferidos: pH (10), temperatura (90 ºC); massa de cabelo (10 mg); tempo de extração (40 min); tempo de dessorção (10 min); força iônica (Na2CO3); tempo de saturação (10 min) e fibra (PDMS). Para HF-LPME um planejamento fatorial fracionário foi empregado na triagem de algumas variáveis desta técnica seguido pelo planejamento composto central na avaliação dos valores ótimos das variáveis escolhidas: solvente de extração (acetato de butila), pH da fase doadora (14), velocidade de agitação (600 rpm), tempo de extração (20 min), força iônica (6,8 % m/v) e volume da fase aceptora (20 μL). Os métodos foram submetidos ao processo de validação demonstrando boa linearidade, com coeficientes de determinação (R2) acima de 0,994. A precisão foi determinada a partir dos limites inferior e superior da faixa linear apresentando valores de RSD entre 6,6 e 16,4% para HS-SPME e 4,4-13,7 % para HF-LPME. Recuperações absolutas foram de 1,1 a 8,7 % (HS-SPME) e 4,4 a 8,9 % (HF-LPME). Os limites de detecção (LD) e quantificação (LQ) foram de 7 a 62 pg mg-1 e 0,5 a 20 pg mg-1 para HS-SPME e HFLPME, respectivamente. O 9-THC apresentou valores de limites de quantificação para os dois métodos abaixo do valor de cut-off (LQ ≤ 100 pg mg-1). Finalmente, os métodos desenvolvidos e validados foram aplicados na determinação de CBD, 9- THC e CBN em amostras de cabelo de pacientes de centro de reabilitação de dependentes químicos. As concentrações dos canabinóides nas amostras variaram do limite de detecção a 18 pg mg-1 para CBD, do limite de detecção a 232 pg mg-1 para 9-THC e 9-300 pg mg-1 para CBN, demonstram a aplicabilidade do método em estudos de monitorização.
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Sahu, Raghvendra. "Evaluatiom of static and dynamic properties of sand reinforced with human hair fibers". Thesis, 2018. http://localhost:8080/iit/handle/2074/7580.
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Fonseca, Ana Luísa Sá. "Evaluation of chemical and physical alterations in hair fibres with different techniques". Master's thesis, 2020. http://hdl.handle.net/1822/73664.
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Dissertação de mestrado em Chemical Analysis and Characterisation TechniquesThe human hair is constantly exposed to external aggressions by environmental factors or hair treatments that damage the hair fibres, affecting their physicochemical properties, mainly at the cuticle level. Therefore, there is a great need of preventing and repairing the hair fibres from these type of damages and the cosmetic industry keeps progressing in that direction. However, the majority of the techniques used for the evaluation of the hair damage are not sensitive nor precise enough to show damages on the hair surface, only showing drastic damages that reach the cortex of the hair fibres and giving images of the surface of the hair, not providing quantitative information. The aim of this study was to develop and validate cutting-edge techniques, not yet explored for hair analysis, to analyse the chemical and physical alterations occurring on the hair cuticle after chemical, heat and chemical + UV + pollution damage. When damaged, the surface of the hair becomes more irregular, having consequently an increase of the surface roughness. So, the hair surface roughness was analysed by Optical Profilometry and mainly two types of damage were analysed: chemical and heat. After testing and designing the methodology to evaluate the hair fibres surface through this technique, the final results showed an increase of the surface roughness for both types of damage when compared with normal hair. However, the differences were not statistically significant in the test conditions, not validating the methodology; still, it has a great potential and a higher number of samples could probably increase the results’ significance. Hair damage was also evaluated by ToF-SIMS and the protocol was designed to calculate the damage degree of the hair fibres through the methyl eicosanoic acid (18-MEA) level of degradation. The three types of damage prepared were analysed. Results showed a significant decrease of the mean peak intensity ratio 18-MEA/CN- on the damaged hair compared to normal hair for all three types of damage. The protocol designed for the ToF-SIMS was validated, showing to be a very sensitive, accurate and precise technique to evaluate the lipid changes on the hair surface induced by the different damages, showing significant differences that are not detected with the traditional techniques normally used.
O cabelo humano está constantemente exposto a agressões externas provocadas por fatores ambientais ou tratamentos capilares que danificam as fibras capilares, afetando as suas propriedades físicoquímicas, principalmente ao nível da cutícula. Pelo exposto, existe uma grande necessidade de prevenir e reparar o cabelo destes tipos de dano e a indústria cosmética progride nessa direção. Contudo, a maioria das técnicas utilizadas atualmente para a avaliação de possíveis danos no cabelo não são suficientemente sensíveis nem precisas para demonstrar o que acontece na superfície das fibras. Estas permitem apenas identificar danos drásticos que atingem o córtex das fibras ou apresentam somente imagens da superfície das fibras, não fornecendo informação quantitativa. O objetivo deste estudo foi desenvolver e validar técnicas inovadoras que ainda não tinham sido exploradas para a análise de cabelo, para estudar as alterações químicas e físicas que ocorrem na cutícula do cabelo após um dano químico, após um dano por calor e após um dano químico, por exposição à radiação UV e à poluição. Quando danificado, a superfície do cabelo torna-se mais irregular, havendo consequentemente um aumento da rugosidade. Assim, a rugosidade da superfície de fibras capilares foi analisada por Profilometria Ótica e sobretudo dois tipos de danos foram analisados: químico e por calor. Após testar e desenhar a metodologia para a avaliação da superfície das fibras capilares através desta técnica, os resultados finais mostraram um aumento da rugosidade da superfície para ambos os tipos de dano quando comparando com cabelo normal. As diferenças obtidas não foram estatisticamente significativas nas condições testadas, não validando a metodologia. Porém, esta técnica tem um grande potencial e um maior número de amostras poderá aumentar a significância dos resultados. Foi também estudada a avaliação por ToF-SIMS. O protocolo foi desenvolvido de forma a calcular quantitativamente o grau de dano das fibras através do nível de degradação do ácido 18-metil-eicosanóico (18-MEA), sendo que foram analisados os três tipos de dano. Os resultados mostraram uma diminuição do rácio do pico de intensidade 18-MEA/CN- no cabelo danificado comparado com cabelo normal para todos os três tipos de dano. Este protocolo foi validado, apresentando ser uma técnica muito sensível, exata e precisa para a avaliação de mudanças em lípidos na superfície do cabelo induzidas por diferentes danos.
Książki na temat "Human hair fibers"
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Feughelman, Max. Mechanical properties and structure of alpha-keratin fibres: Wool, human hair and related fibres. Sydney: UNSW Press, 1997.
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Feughelman, Max. Mechanical properties and structure of alpha-keratin fibres: Wool, human hair, and related fibres. Sydney: UNSW Press, 1997.
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Mechanical properties and structure of alpha-keratin fibres: Wool, human hair and related fibres. Sydney: UNSW Press, 1997.
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Feughelman, Max. Mechanical Properties and Structure of Alpha-Keratin Fibers: Wool, Human Hair and Related Fibres. UNSW Press, 1996.
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Study on Concrete with Human Hair Fibre Reinforced Concrete. Tiruchengode, India: ASDF International, 2017.
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Experimental Study on conventional Concrete with Human Hair Fibre Reinforced Concrete. Tiruchengode, India: ASDF International, 2017.
Znajdź pełny tekst źródłaCzęści książek na temat "Human hair fibers"
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Robbins, Clarence R. "The Physical Properties of Hair Fibers". W Chemical and Physical Behavior of Human Hair, 537–640. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25611-0_9.
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Christie, Robert M., i Olivier J. X. Morel. "The Coloration of Human Hair". W The Coloration of Wool and other Keratin Fibres, 357–91. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118625118.ch11.
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Robbins, Clarence R. "Genetic Control/Involvement in Hair Fiber Traits". W Chemical and Physical Behavior of Human Hair, 177–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25611-0_3.
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Robbins, Clarence R. "Definitions of Consumer Relevant Hair Assembly Properties and How These are Controlled by Single Fiber Properties". W Chemical and Physical Behavior of Human Hair, 641–707. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25611-0_10.
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Dhakad, S. K., i Anas Ahmed Ansari. "Mechanical Properties of Sisal Fibre and Human Hair Reinforced Epoxy Resin Hybrid Polymer Composite". W Algorithms for Intelligent Systems, 533–40. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-6707-0_51.
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Jayanthi, V., B. Soundara, S. Priyadharshini, J. Adhithya, M. Sharmaa Devi i S. Amritha Shankar. "Influence of Human Hair Fibre, Geogrid and PVC Grid on the Performance of CBR of Clayey Soil". W Springer Proceedings in Materials, 147–53. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8319-3_16.
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Patrucco, Alessia, Livia Visai, Lorenzo Fassina, Giovanni Magenes i Claudio Tonin. "Keratin-based matrices from wool fibers and human hair". W Materials for Biomedical Engineering, 375–403. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-816872-1.00013-3.
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Skinner, H. Catherine W., Malcolm Ross i Clifford Frondel. "What Is an Inorganic Fiber?" W Asbestos and Other Fibrous Materials. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195039672.003.0004.
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Fibers are everywhere around us. They are essential parts of the human body, our hair, for example; the threads in our clothing, natural or synthetic; the insulation in our houses. Natural fibers have been useful to humans for more than ten thousand years. They were mixed with clay before firing to strengthen and reinforce pottery vessels, making them more durable. Textiles that combined the fibers of flax and asbestos were known in ancient times for their seemingly magical resistance to fire and decay. It was industrialization, however, that caused a dramatic increase in the use of natural inorganic or mineral fibers. By the late nineteenth century asbestos had become an important commodity with a variety of commercial applications. It served as insulation to control heat generated by engines and, because of its incombustibility, as a fire retardant in its more recent general use as building insulation. Asbestos fibers are found worldwide in many products: as reinforcement in cement water pipes and the inert and durable mesh material used in filtration processes of chemicals and petroleum, for example. However, asbestos is not the only inorganic fiber in use today. Synthetic inorganic fibers abound. Glass fibers have replaced copper wire in some intercontinental telephone cables. Fiberglas (a trade name) has become the insulation material of choice in construction. Carbon and graphite fiber composites are favored materials for tennis racket frames and golf clubs. Fibrous inorganic materials have become commonplace in our everyday lives. As the use of inorganic fibers increased, there were some indications that fibers might be hazardous to our health. Since the first century A.D. it was suspected that asbestos might be the cause of illness among those who mined and processed the material. Asbestosis, a debilitating and sometimes fatal lung disorder, was documented and described in the nineteenth century. Within the last 25 years, lung cancer and mesothelioma have also been linked to asbestos exposure among construction and textile workers, as well as others exposed to dusts containing asbestos fibers. Although the etiology and specific mechanisms that give rise to these two cancers are not yet understood, concern for the health of exposed workers led the governments of the United States and other countries to specify the maximum allowable concentrations of asbestos in the ambient air of the workplace.
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HEARLE, J. W. S., B. LOMAS i W. D. COOKE. "WOOL AND HUMAN HAIR". W Atlas of Fibre Fracture and Damage to Textiles, 138–51. Elsevier, 1998. http://dx.doi.org/10.1533/9781845691271.4.138.
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Donadelli, Renan, i Greg Aldrich. "Miscanthus Grass as a Nutritional Fiber Source for Monogastric Animals". W Grasses and Grassland - New Perspectives [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99951.
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While fiber is not an indispensable nutrient for monogastric animals, it has benefits such as promoting gastrointestinal motility and production of short chain fatty acids through fermentation. Miscanthus x giganteus is a hybrid grass used as an ornamental plant, biomass for energy production, construction material, and as a cellulose source for paper production. More recently Miscanthus grass (dried ground Miscanthus x giganteus) was evaluated for its fiber composition and as a fiber source for poultry (broiler chicks) and pets (dogs and cats). As a fiber source, this ingredient is mostly composed of insoluble fiber (78.6%) with an appreciable amount of lignin (13.0%). When added at moderate levels to broiler chick feed (3% inclusion) Miscanthus grass improved dietary energy utilization. However, when fed to dogs at a 10% inclusion Miscanthus grass decreased dry matter, organic matter, and gross energy digestibility, and increased dietary protein digestibility compared to dogs fed diets containing similar concentrations of beet pulp. Comparable results were reported for cats. In addition, when Miscanthus grass was fed to cats to aid in hairball management, it decreased the total hair weight per dry fecal weight. When considering the effects Miscanthus grass has on extruded pet foods, it behaves in a similar manner to cellulose, decreasing radial expansion, and increasing energy to compress the kibbles, likely because of changes in kibble structure. To date, Miscanthus grass has not been evaluated in human foods and supplements though it may have applications similar to those identified for pets.
Streszczenia konferencji na temat "Human hair fibers"
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Marschner, Stephen R., Henrik Wann Jensen, Mike Cammarano, Steve Worley i Pat Hanrahan. "Light scattering from human hair fibers". W ACM SIGGRAPH 2003 Papers. New York, New York, USA: ACM Press, 2003. http://dx.doi.org/10.1145/1201775.882345.
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R, Ayothiraman, Priyabrata Bhuyan i Rahul Jain. "Comparative Studies on Performance of Human Hair and Coir Fibers against Synthetic Fibers in Soil Reinforcement". W Annual International Conference on Architecture and Civil Engineering (ACE 2014). Global Science and Technology Forum, 2014. http://dx.doi.org/10.5176/2301-394x_ace14.86.
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Jarvis, David, Angela Edwards i Narayan Bhattarai. "Extraction and Production of Keratin-Based Nanofibers for Biomedical Applications". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64501.
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Keratin, a natural biomaterial found within the hair, nails, and epidermis of humans, has shown promise of being a useful material for tissue engineering scaffolds and drug delivery systems, due in part to its favorable biological qualities. The scaffolds generated by electrospinning are useful in proliferating cells, and can even biodegrade over time, reducing the impact on the body and not invoking any adverse tissue response. This research details the extraction process of keratin from human hair, and using electrospinning to weave the keratin into nanofibrous polymers. Using a synthetic polymer solution, for example, polycaprolactone (PCL) in trifluoroethanol (TFE), keratin was easily mixed and successfully electrospun into nanofibers. The fiber formation characteristics and nanofiber morphology was studied under a scanning electron microscope (SEM).
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Sancheti, Gaurav, i Lucas Pais. "Sustainable infrastructure development: Concrete with human hair as fiber". W 2018 Advances in Science and Engineering Technology International Conferences (ASET). IEEE, 2018. http://dx.doi.org/10.1109/icaset.2018.8376760.
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Borkar, Navoday, Ajit Dorwat i Amarsingh Kanase-Patil PhD. "Mechanical Behavior of Glass Fiber Reinforced with Human Hair and Jute". W International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0409.
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Berwal, Parveen, Rameshvar, Sakshi Yadav, Shilpa Singla, Akshay Dhawan i Rajesh Goyal. "Utilization of human hair as fibre reinforcement in rigid pavement". W 2ND INTERNATIONAL CONFERENCE ON FUTURISTIC AND SUSTAINABLE ASPECTS IN ENGINEERING AND TECHNOLOGY: FSAET-2021. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0154838.
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Mohan, Madhu, S. Manivannan, C. Ayyappadas, P. Aneesh Kumar i R. Vishnu. "Fabrication and analysis of human hair fiber reinforced epoxy composites: A sustainable approach". W INTERNATIONAL CONFERENCE ON MINERALS, MATERIALS AND MANUFACTURING METHODS (ICMMMM). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0158674.
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Luo, Qingming, Shoko Nioka i Britton Chance. "Imaging on Brain Model by a Novel Optical Probe - Fiber Hairbrush". W Advances in Optical Imaging and Photon Migration. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/aoipm.1996.mt155.
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The continuous light method like RunMan hemoglobinometer was successfully used to record hemoglobin desaturation of the brain in comatose patients and the detection of brain bleeds. In this paper, a new optical probe for brain oxygenation detection-fiber hairbrush is presented. This novel probe can replace the usual RunMan probe and make the RunMan device more flexible when measuring the brain deoxygenation and desaturation. To seek the possibility of functional imaging on human brain by the hairbrush, several tests have been taken. It is shown that (1) fiber hairbrush can detect the same signal through the hair as the usual RunMan probe do from the direct contact measurement. (2) Object hidden in the brain model can be detected and imaged by the hairbrush. (3) Oxygenation changes of the human brain due to motor activity can be indicated. Further experimental results on human brain activity by a computer controlled continuous wave optical imaging probe were presented. The functional image from the imaging probe can localize the relative concentration in Oxy-Hb changes of brain which corresponds anatomically to the motor cortex.