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Dissertations / Theses on the topic 'MELANIN PIGMENT'

Author: Grafiati

Published: 11 September 2023

Last updated: 25 July 2025

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1

Coffey, Bethany N. "Melanin as an Oto-Protective Pigment in Two Fish Species: Poecilia Latipinna and Cyprinus Carpio ." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1403.

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Melanin is the dark pigment found in most organisms that gives color to the skin, hair, feathers, and eyes of vertebrates. While melanin is known to also be present in the stria vascularis of the mammalian cochlea, its function in the inner ear is still unknown. Some previous studies have indicated that melanin may serve to protect the mammalian ear from hearing loss. Minimal previous research on melanin within the inner ears of fishes has been conducted. In this study, the melanin levels in the inner ears of different color morphs of two fish species (Poecilia latipinna and Cyprinus carpio) w

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2

Glória, Thiago Henrique Ribeiro. "Efeito de α-MSH sobre a expressão gênica de rodopsina, tirosinase e do receptor de α-MSH, subtipo MC1R, em melanócito B16 de Mus musculus." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/41/41135/tde-08012013-151106/.

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A coloração dos vertebrados deve-se a presença de pigmentos, sintetizados e/ou armazenados em células denominadas células pigmentares cutâneas. A mudança de cor nos vertebrados é principalmente regulada por α-MSH e uma família de enzimas melanossômicas, que incluem tirosinase e as proteínas relacionadas à tirosinase 1 e 2 (TRP-1 e TRP-2, respectivamente). Sua ação está ligada à dispersão dos melanossomos ou síntese de melanina, processos que resultam em escurecimento do animal, enquanto a agregação ou inibição de síntese leva ao seu empalidecimento. Opsinas, como a melanopsina e a rodops

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3

Santos, Luciane Rogéria dos. "Expressão gênica de receptor de melatonina (Mel1) e melanopsinas (Opn4x e Opn4m) em melanóforos de Xenopus laevis." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/41/41135/tde-09022011-104538/.

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Muitos vertebrados ectotérmicos ajustam suas cores corporais para serem confundidos com o ambiente, através da migração de pigmentos no interior de cromatóforos, regulada por sistemas neurais e/ou hormonais. Essas mudanças de coloração auxiliam no mimetismo, termorregulação, comunicação social e expressão de comportamentos como excitação sexual, agressividade e medo. Entretanto, cromatóforos de inúmeras espécies respondem diretamente à luz. Estudos sobre a resposta à luz nos melanóforos de Xenopus laevis levaram à descoberta do fotopigmento melanopsina, uma opsina que está presente na retina d

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4

Wang, Erpei. "Pigments in Rust Fungi: Biosynthesis, Role in Plant-Pathogen Interactions, and Evolution." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18434.

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Diseases caused by rust fungi represent critical constraints to global plant production. A characteristic feature of these pathogens is the striking pigments they produce in one or more spore forms, which give them a rusty appearance. These pigments are thought to protect rust fungi against UV radiation and oxidative stress, and possibly act as virulence factors. The cytoplasmic carotenoid pigment composition and relative abundance of 14 rust species were studied, including Puccinia graminis f. sp. tritici (Pgt), P. striiformis f. sp. tritici, P. triticina, P. hordei, P. psidii, P. thaliae, P

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5

Teh, Muy-Teck. "Cellular and molecular studies on pigment-granule translocation in Xenopus laevis melanophores." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312268.

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6

Hsiung, Bor-Kai. "COLOR PRODUCTION MECHANISMS IN SPIDERS AND THEIR BIOMIMICRY POTENTIAL." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1497355826810282.

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7

SUFI, BIANCA da S. "Utilização de cocultura de melanócitos e queratinócitos para avaliação da ação do líquido da castanha de caju (LCC) na pigmentação epidérmica." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10197.

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Made available in DSpace on 2014-10-09T12:35:54Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:26Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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8

Gonçalves, Rita de Cássia Ribeiro [UNESP]. "Estudo da estrutura e da atividade biológica do pigmento melanina produzido pelo fungo Aspergillus nidulans." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/100739.

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Made available in DSpace on 2014-06-11T19:31:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-09-24Bitstream added on 2014-06-13T18:41:23Z : No. of bitstreams: 1 goncalves_rcr_dr_araiq.pdf: 2969131 bytes, checksum: 2ec7f5373394bf23e94222f4356154f3 (MD5)<br>Outros<br>Do fungo Aspergillus nidulans foi isolado um mutante que apresenta producao aumentada do pigmento melanina. Este pigmento, formado pela polimerizacao oxidativa de compostos fenolicos e/ou indolicos, pode estar presente na parede celular ou no meio de cultura. Embora nao seja essencial para o crescimento dos fungos, a mel

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9

Walsh, Neil. "Investigation into the genetic basis of carotenoid and melanin colouration in red-billed queleas." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609827.

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10

Gonçalves, Rita de Cássia Ribeiro. "Estudo da estrutura e da atividade biológica do pigmento melanina produzido pelo fungo Aspergillus nidulans /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/100739.

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Orientador: Sandra Regina Pombeiro Sponchiado<br>Banca: Iracilda Zeppone Carlos<br>Banca: Valdecir Farias Ximenes<br>Banca: Jairo Kenupp Bastos<br>Dagmar Ruth Stach Machado<br>Resumo: Do fungo Aspergillus nidulans foi isolado um mutante que apresenta producao aumentada do pigmento melanina. Este pigmento, formado pela polimerizacao oxidativa de compostos fenolicos e/ou indolicos, pode estar presente na parede celular ou no meio de cultura. Embora nao seja essencial para o crescimento dos fungos, a melanizacao parece aumentar a capacidade de sobrevivencia das especies em condicoes desfavoraveis

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11

KOEGLER, VERA L. "Uso do laser de COsub(2) ou bisturi a frio para a remoção de pigmento melânico gengival - estudo clínico comparativo em pós-operatório precoce." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11284.

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Made available in DSpace on 2014-10-09T12:50:17Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:58:47Z (GMT). No. of bitstreams: 1 10828.pdf: 923135 bytes, checksum: 56ecab1b373cf9b110daef6cebfdb5ea (MD5)<br>Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia)<br>IPEN/D-MPLO<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP; Faculdade de Odontologia - USP

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12

ROSA, DANIEL S. de A. "Avaliacao clínica dos efeitos do laser de Er:YAG na remoção da pigmentação melânica fisiológica gengival." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11648.

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Made available in DSpace on 2014-10-09T12:54:17Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:24Z (GMT). No. of bitstreams: 1 12721.pdf: 1311096 bytes, checksum: 22084656a59baab5efae7aa9f7ff9481 (MD5)<br>Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia)<br>IPEN/D-MPLO<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo, Sao Paulo

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13

Zieri, Rodrigo. "Influência hormonal sobre o sistema pigmentar em Eupemphix nattereri (Anura) : efeitos do alpha-MSH, estradiol e testosterona /." São José do Rio Preto : [s.n.], 2010. http://hdl.handle.net/11449/100500.

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Resumo: Os vertebrados ectotérmicos apresentam um desenvolvido sistema de células com pigmentos melânicos em seu citoplasma, localizado em diversos órgãos e membranas. A dispersão dos grãos de melanina dentro dos melanócitos responde fortemente à exposição ao hormônio estimulante de melanócitos (MSH) e aos hormônios sexuais, promovendo alteração na coloração. Este trabalho buscou avaliar o efeito dos esteróides cipinato de testosterona, 17 β-estradiol e do MSH sobre a pigmentação hepática e testicular de Eupemphix nattereri, mediante análise histológica, e ultra-estrutural. Foram coletados 60

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14

Zieri, Rodrigo [UNESP]. "Influência hormonal sobre o sistema pigmentar em Eupemphix nattereri (Anura): efeitos do alpha-MSH, estradiol e testosterona." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/100500.

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Made available in DSpace on 2014-06-11T19:30:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-01Bitstream added on 2014-06-13T19:01:01Z : No. of bitstreams: 1 zieri_r_dr_sjrp.pdf: 889017 bytes, checksum: 170c2d62d9c91d29ca0d8ba71a162b3b (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Os vertebrados ectotérmicos apresentam um desenvolvido sistema de células com pigmentos melânicos em seu citoplasma, localizado em diversos órgãos e membranas. A dispersão dos grãos de melanina dentro dos melanócitos responde fortemente à exposição ao hormônio estimula

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15

Nash, Mark Simon. "Melatonin and serotonin receptors associated with cultured human, and normal and Royal College of Surgeons rat retinal pigment epithelium." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282157.

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16

Rodenbusch, Rodrigo. "An?lise de SNPS em genes de pigmenta??o humana em indiv?duos com alto ou baixo conte?do de melanina." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/5997.

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Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-05-14T11:12:13Z No. of bitstreams: 1 468517 - Texto Completo.pdf: 6892081 bytes, checksum: c5aa659f71c5093d831d4810c3ab482c (MD5)<br>Made available in DSpace on 2015-05-14T11:12:13Z (GMT). No. of bitstreams: 1 468517 - Texto Completo.pdf: 6892081 bytes, checksum: c5aa659f71c5093d831d4810c3ab482c (MD5) Previous issue date: 2014-08-27<br>The understanding of gene function in the externally visible characteristcs (EVC) expression has several uses in human population evolution studies or in forensic investigations

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17

Karakaya, Ceylan. "Synthesis Of Oil Based Hyperbranched Resins And Their Modification With Melamine Formaldehyde Resins." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606339/index.pdf.

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In this research hyperbranched resins containing fatty acid residues like alkyds were synthesized. Dipentaerythritol which has six hydroxyl groups was used as the core molecule, and it was transesterified with (i) castor oil, and (ii) a mixture of castor oil and linseed oil at 240&deg<br>C in the presence of sodium hydroxide as catalyst. The resulting molecule, in either case, was then esterified with dimethylol propionic acid at 140&deg<br>C in the presence of p-toluene sulfonic acid as catalyst. Melamine-formaldehyde resin was synthesized to be used with the synthesized hyperbranched resin

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18

Stephen, Ian D. "Skin colour, pigmentation and the perceived health of human faces." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/753.

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19

Roecklein, Kathryn Ariel. "Melanopsin polymorphisms in seasonal affective disorder /." Download the thesis in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/Roecklein2005.pdf.

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20

Chung, Wei-Ju, and 鐘緯儒. "Melanin distribution in the porcine retinal pigment epithelium measured by Raman scattering spectroscopy." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/79382122823806883680.

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碩士<br>國立陽明大學<br>生醫光電工程研究所<br>92<br>The purpose of this study was to know whether the melanin in retinal pigment epithelium (RPE) would interfere with retina or not on Raman spectrum; to measure the contents of melanin and to determine the distribution of melanin in RPE. First of all, we tested the Raman spectrum of melanin powder which was synthesized. We got the range of spectrum of melanin powder from 1550cm-1 to 1600cm-1. We tried to measure the Raman spectrum of pig's RPE. The result of spectrum of pig's RPE had the same profile as melanin from 1550cm-1 to 1600cm-1, but the Raman intensity

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21

Tudor, Daniela. "Fungal Pigment Formation in Wood Substrate." Thesis, 2013. http://hdl.handle.net/1807/43743.

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A number of fungi produce spalted wood, which is characterized by accumulation of black pigment in fine demarcation lines, often accompanied by discoloration or staining on the wood fibers. Specific spalting fungi were identified by molecular analysis. From a total of 19 isolates and 140 clones studied, 11 fungal species were identified. The two Chlorociboria species from North America were investigated and their anamorphs were unambiguously identified for the first time. Fungal pigment formation under the influence of moisture content and pH variation was investigated in sugar maple, America

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22

SINGH, ADITI. "STUDIES ON ISOLATION, BIOPRODUCTION AND CHARACTERIZATION OF MELANIN PRODUCED FROM NEWLY SCREENED BACTERIAL CULTURES FROM DTU LAKE." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16833.

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Melanins are composed of polymerized phenolic and/or indolic compounds, commonly found in organisms across all biological kingdoms. In this study, a total of 11 melanin producing bacterial strains were screened from lake water sample collected from DTU Lake, Delhi Technological University, India, using nutrient media supplemented with LTyrosine. Further these pigment producing strains were subjected for various biochemical tests to indicate the organism. Two strains RT3 and Ep1 were sent for microbial identification based on 16S rDNA molecular techniques, consensus sequences were obtained and

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23

Masoodi, Mojgan, Anna Nicolaou, Karl Gledhill, L. E. Rhodes, Desmond J. Tobin, and Anthony J. Thody. "Prostaglandin D2 production in FM55 melanoma cells is regulated by ¿-melanocyte stimulating hormone and is not related to melanin production." 2010. http://hdl.handle.net/10454/4581.

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no<br>This study shows that prostaglandins in human FM55 melanoma cells and epidermal melanocytes are produced by COX-1. Prostaglandin production in FM55 melanoma cells was unrelated to that of melanin suggesting that the two processes can occur independently. ¿-Melanocyte stimulating hormone (¿-MSH), which had no effect on melanin production in FM55 cells, stimulated PGD2 production in these cells without affecting PGE2. While cAMP pathways may be involved in regulating PGD2 production, our results suggest that ¿-MSH acts independently of cAMP, possibly by regulating the activity of lipocalin

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24

Stein, W. D. "Melanogenesis and the structure of the melanin granule." Thesis, 2014.

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25

Panzella, Lucia. "Analisi e proprietà strutturali di pigmenti melanici: acidi benzotiazolici/tiazolici come markers di fotosensibilità." Tesi di dottorato, 2008. http://www.fedoa.unina.it/1757/1/Panzella_Dermatologia_Sperimentale.pdf.

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26

Micillo, Raffaella. "Properties of melanin pigments for the definition of mechanisms of (photo)toxicity in red hair phenotype and development of strategies of (photo)protection." Tesi di dottorato, 2017. http://www.fedoa.unina.it/11489/1/micillo_raffaella_29.pdf.

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In recent years particular attention has been focused on the properties of melanin pigments with regard to their association with some pathological conditions and to their controversial role in the response of skin to solar radiation. This is especially true in the case of pheomelanins, typical of red hair phenotype, with red hair pale skin, blue-green eyes and freckles. People exhibiting this phenotype have poor tanning capacity, exhibit a UV-susceptibility trait with high tendency to sunburn and an increased risk for skin tumors and melanoma. On the other hand, eumelanins are commonly belie

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27

Higileh, Assmaà Abu. "Hiperpigmentação gengival: uma revisão bibliográfica." Master's thesis, 2017. http://hdl.handle.net/10284/6347.

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A estética ocupa uma parte significativa do trabalho no âmbito da medicina dentária. A cor da gengiva desempenha um papel importante na estética facial. A pigmentação melánica gengival ocorre em todas as raças, em qualquer idade, não apresentando predileção de gênero. O grau de pigmentação da melanina pode variar de pessoa para pessoa. Os clínicos enfrentam desafios para alcançar uma estética gengival aceitável, bem como para abordar problemas biológicos e funcionais. No entanto, os princípios e a técnica de gestão dos problemas associados à pigmentação da melanina gengival ainda não est

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