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Arq. gastroenterol ; 58(1): 61-70, Jan.-Mar. 2021. graf
Article in English | LILACS | ID: biblio-1248985


ABSTRACT BACKGROUND: Fluorescent imaging with indocyanine green is an emerging technology whose benefits are put in perspective. OBJECTIVE: This article reports essential principles and approaches of intraoperative fluorescence in general surgery bringing familiarity to its practical usage. Our group describes possible pitfalls and provides tips and tricks for training surgeons making their attempts easier and reproducible during practice. METHODS: This study overviews the most structured concepts, practical applications and its tricks in robotic fluorescence guided imaging surgery with indocyanine green. Possible pitfalls are emphasized and emerging fields of application are put in a perspective. RESULTS: Guided information and practical applications in several surgical fields are described for a safe and reproducible indocyanine green fluorescence imaging use. CONCLUSION: Robotic assisted surgery combined to fluorescence imaging technology represents a logical evolution in image guided surgery and technology familiarity with guided information may represent a wider and safer spectrum of use in surgeons' hands.

RESUMO CONTEXTO: A imagem fluorescente com verde de indocianina (VI) é uma técnica cirúrgica emergente na cirurgia robótica. OBJETIVO: Este artigo relata princípios e abordagens essenciais da fluorescência intraoperatória para sua prática em cirurgia geral. Nosso grupo descreve possíveis armadilhas e apresenta dicas e truques para treinar cirurgiões, tornando o uso do VI reprodutível. MÉTODOS: Este estudo apresenta uma visão geral dos conceitos e aplicações práticas da imagem guiada por fluorescência com VI na cirurgia robótica. As possíveis armadilhas são enfatizadas e os campos de aplicação emergentes são colocados em perspectiva. RESULTADOS: Aplicações práticas em vários campos cirúrgicos são descritas para um uso seguro e reprodutível de imagens de fluorescência com VI. CONCLUSÃO: A cirurgia assistida por robótica combinada à tecnologia de imagem de fluorescência representa uma evolução lógica na cirurgia guiada por imagem e a familiaridade desta técnica pode representar um ganho da qualidade cirúrgica.

Humans , Surgical Procedures, Operative , Coloring Agents , Optical Imaging , Indocyanine Green
Braz. arch. biol. technol ; 64: e21200182, 2021. tab, graf
Article in English | LILACS | ID: biblio-1339318


Abstract Solvent extraction of red pigments from fermented solids is reported. The pigments were produced by solid-state fermentation of oil palm frond (OPF) biomass with the food-safe fungus Monascus purpureus FTC 5357. The effects of extraction solvent and other operational conditions (pH, temperature, agitation rate, contact time) on the recovery of pigments are discussed. The recovery was maximized using aqueous ethanol (60% ethanol by vol) as solvent at pH 6, 30 °C, with an extraction time of 16 h and an agitation rate of 180 rpm. A fermented solids dry mass of 1 g was used for each 160 mL of solvent during extraction. The kinetics of extraction were assessed by fitting the experimental data to different models. Peleg's model proved to be the best for describing solid-liquid extraction of the pigments under the above specified conditions. The highest extraction yield of red pigments under the above specified optimal conditions was 207(6.08 AU g(1 dry fermented solids.

Monascus , Coloring Agents , Fermentation , Kinetics
Rev. méd. Maule ; 36(2): 8-14, dic. 2020.
Article in Spanish | LILACS | ID: biblio-1344577


In our country, cardiovascular diseases (CVD) are the main cause of death. Unhealthy eating habits and sedentary lifestyles, among other factors, have contributed to increase the risk for CDV in the population. An alternative to the commonly used pharmacological therapies is the use of validated natural products that can be incorporated in the development of functional foods or supplements. In particular, the tomato has been shown to have a protective role in CVD; its high content of antioxidants, particularly lycopene, provides it with extensively documented beneficial properties. Tomasa, a by-product of the agroindustry, maintains some of the beneficial characteristics of its fruit of origin. Mice fed with a high-fat (hypercaloric) diet increase their body weight and visceral adipose mass, and also display an increase in metabolic and inflammatory parameters. Our results allow us to conclude that the consumption of Tomasa in mice fed a hypercaloric diet reduces the blood levels of cholesterol, glycaemia and pro-inflammatory cytokines. These results support the rationale of using of this by-product in the generation of functional ingredients with proven beneficial effects.

Animals , Male , Mice , Lycopersicon esculentum/metabolism , Metabolic Syndrome/metabolism , Metabolic Syndrome/prevention & control , Biochemical Phenomena , Inflammatory Bowel Diseases/metabolism , Inflammatory Bowel Diseases/prevention & control , Statistical Analysis , Coloring Agents/analysis
Electron. j. biotechnol ; 47: 36-42, sept. 2020. tab, ilus, graf
Article in Spanish | LILACS | ID: biblio-1253018


BACKGROUND: For more than a decade, water-soluble, eco-friendly, biocompatible, and low-toxicity fluorescent nanomaterials have received considerable attention for their numerous in vivo and in vitro applications in biomedical imaging, disease diagnostics, and environmental monitoring. Owing to their tunable photoluminescence properties, carbon-based luminescent nanomaterials have shown great potential in bioimaging, photocatalysis, and biosensing among other applications. RESULTS: Marine environments provide excellent resources for the fabrication of these nanomaterials, because many marine organisms contain interesting trigger organic compounds that can be used as precursors. Herein, we synthesize multi-color emissive carbon dots (CDs) with an intrinsic photoluminescence quantum yield of 20.46%. These nanostructures were achieved through the one-step hydrothermal treatment of marine polysaccharide chondroitin sulfate, obtained from shark cartilage, in aqueous solution. CONCLUSIONS: We successfully demonstrate the low toxicity of our marine resource-derived CDs in zebrafish, and provide an initial assessment of their possible use as a bioimaging agent. Notably, the newly synthesized CDs localize in the intestines of zebrafish larvae, thereby indicating their biocompatibility and potential use as in vivo dyes.

Animals , Polysaccharides/chemistry , Sharks , Carbon/chemistry , Quantum Dots/chemistry , Zebrafish , Carbon/toxicity , Cartilage , Quantum Dots/toxicity , Luminescence , Nanostructures , Coloring Agents/toxicity , Coloring Agents/chemistry
Electron. j. biotechnol ; 46: 22-29, jul. 2020. tab, graf
Article in English | LILACS | ID: biblio-1223226


BACKGROUND: Removal of dyes from wastewater by microorganisms through adsorption, degradation, or accumulation has been investigated. Biological methods used for dye treatment are generally always effective and environmentally friendly. In this study, biosorption of the Fast Black K salt azo dye by the bacterium Rhodopseudomonas palustris 51ATA was studied spectrophotometrically, at various pH (2­10), temperatures (25°C, 35°C, and 45°C) and dye concentrations (25­400 mg L-1). RESULTS: The bacterial strain showed extremely good dye-removing potential at various dye concentrations. IR studies at different temperatures showed that the dye was adsorbed on the bacterial surface at lower temperatures. Characteristics of the adsorption process were investigated by Scatchard analysis at 25°C and 35°C. Scatchard analysis of the equilibrium binding data for the dye on this bacterium gave rise to linear plots, indicating that the Langmuir model could be applied. The regression coefficients obtained for the dye from the Freundlich and Langmuir models were significant and divergence from the Scatchard plot was observed. CONCLUSION: The adsorption behavior of the dye on this bacterium was expressed by the Langmuir, Freundlich, and Temkin isotherms. The adsorption data with respect to various temperatures provided an excellent fit to the Freundlich isotherm. However, when the Langmuir and Temkin isotherm models were applied to these data, a good fit was only obtained for the dye at lower temperatures, thus indicating that the biosorption ability of R. palustris 51ATA is dependent on temperature, pH, and dye concentration.

Rhodopseudomonas/metabolism , Diazonium Compounds/metabolism , Coloring Agents/metabolism , Temperature , Azo Compounds/analysis , Azo Compounds/metabolism , Contaminant Removal , Adsorption , Coloring Agents/analysis , Waste Water , Hydrogen-Ion Concentration
Acta bioquím. clín. latinoam ; 54(4): 461-466, jul. 2020. tab, graf
Article in Spanish | LILACS | ID: biblio-1149035


Resumen Los residuos de ácido siálico de las glicoproteínas de superficie son los principales responsables de la carga negativa eritrocitaria. El objetivo de este trabajo fue estudiar alteraciones de carga globular producidas por Trichinella spiralis y Trichinella patagoniensis. Se trabajó con concentrados de larvas musculares de ambas especies y con eritrocitos frescos. Se incubó el sedimento globular con igual volumen de concentrado larval (1 y 2 horas). Los controles fueron incubados con solución salina. Se aplicó el método de Azul Alcian y se determinó el coeficiente experimental de carga aniónica eritrocitaria (CexpCAE). Los resultados mostraron que la carga disminuyó con el aumento del tiempo de tratamiento para ambas especies. Los valores de CexpCAE de las suspensiones incubadas con T. spiralis fueron menores que con T. patagoniensis, indicando que T. spiralis produjo mayor disminución de carga que T. patagoniensis. Se concluye que la desialización producida por ambas especies no es la misma, lo que sugiere que la relación hospedador-parásito que se establecería in vivo sería distinta.

Abstract The sialic acid residues of the surface glycoproteins are mainly responsible for the erythrocyte negative charge. The objective of this work was to study alterations of globular charge produced by Trichinella spiralis and Trichinella patagoniensis. Work was carried out on muscle larvae concentrates of both species and fresh erythrocytes. The treatment was performed by incubating the globular pellet with equal volume of larval concentrate (1 and 2 hours). Controls were incubated with saline solution. The Alcian Blue method was applied and the experimental coefficient of erythrocyte anion charge (expCEAC) was determined. The results showed that the globular charge decreased with increasing treatment time for both species. The expCEAC values of the suspensions incubated with T. spiralis were lower than with T. patagoniensis, indicating that T. spiralis produced a greater decrease in charge than T. patagoniensis. It is concluded that the desialization produced by both species is not the same, suggesting that the host-parasite relationship that would be established in vivo would be different.

Resumo Os resíduos de ácido siálico das glicoproteínas de superfície são os principais responsáveis pela carga negativa dos eritrócitos. O objetivo desse trabalho foi estudar as alterações da carga globular produzidas por Trichinella spiralis e Trichinella patagoniensis. Trabalhamos com concentrados de larvas musculares de ambas as espécies e com eritrócitos frescos. O tratamento foi realizado incubando o sedimento globular com igual volume de concentrado larval (1 e 2 horas), Os controles foram incubados com solução salina. Foi aplicado o método de Azul de Alcian e se determinou o coeficiente experimental de carga aniônica de eritrócitos (CexpCAE). Os resultados mostraram que a carga diminuiu com o aumento do tempo de tratamento para ambas as espécies. Os valores de CexpCAE das suspensões incubadas com T. spiralis foram menores que com T. patagoniensis, indicando que T. spiralis produziu uma diminuição maior na carga que T. patagoniensis. Conclui-se que a dessalinização produzida por ambas as espécies não é a mesma, sugerindo que a relação hospedeiro parasita que seria estabelecida in vivo é diferente.

Animals , Trichinella/physiology , Alcian Blue , Coloring Agents , Erythrocytes/parasitology , Larva/physiology , Spectrophotometry , Trichinella spiralis/physiology , Erythrocytes/chemistry , Host-Parasite Interactions
Rev. bras. oftalmol ; 79(2): 138-140, Mar.-Apr. 2020. graf
Article in English | LILACS | ID: biblio-1137948


Abstract The purpose is to report the management of multiple retinal epithelial detachments (PEDs) in a 50-year-old male with bilateral PEDs not associated with chorioretinal or systemic pathologies after a complete study. Idiopathic multiple PEDs could be a variation of central serous chorioretinopathy, but other causes as well as other pathological conditions which could produce similar images, are required to be ruled out.

Resumo O objetivo é relatar o manejo de múltiplos descolamentos epiteliais da retina (DEPs) em um homem de 50 anos de idade com DEPs bilaterais não associado a patologias coriorretinianas ou sistêmicas após um estudo completo. PEDs idiopáticos múltiplos podem ser uma variação da coriorretinopatia serosa central, mas precisam excluir outras causas, bem como outras condições patológicas que podem produzir imagens semelhantes.

Humans , Male , Middle Aged , Retinal Detachment/diagnostic imaging , Fluorescein Angiography/methods , Tomography, Optical Coherence/methods , Coloring Agents , Central Serous Chorioretinopathy/diagnostic imaging , Indocyanine Green
Electron. j. biotechnol ; 43: 1-7, Jan. 2020. tab, graf, ilus
Article in English | LILACS | ID: biblio-1087520


Background: Textile industry not only plays a vital role in our daily life but also a prominent factor in improving global economy. One of the environmental concern is it releases huge quantities of toxic dyes in the water leading to severe environmental pollution. Bacterial laccase and azoreductase successfully oxidize complex chemical structure of nitrogen group-containing azo dyes. Additionally, the presence of textile dye infuriates bacterial peroxidase to act as a dye degrading enzyme. Our present study deals with three textile dye degrading enzymes laccase, azoreductase, and peroxidase through analyzing their structural and functional properties using standard computational tools. Result: According to the comparative analysis of physicochemical characteristics, it was clear that laccase was mostly made up of basic amino acids whereas azoreductase and peroxidase both comprised of acidic amino acids. Higher aliphatic index ascertained the thermostability of all these three enzymes. Negative GRAVY value of the enzymes confirmed better water interaction of the enzymes. Instability index depicted that compared to laccase and preoxidase, azoreductase was more stable in nature. It was also observed that the three model proteins had more than 90% of total amino acids in the favored region of Ramachandran plot. Functional analysis revealed laccase as multicopper oxidase type enzyme and azoreductase as FMN dependent enzyme, while peroxidase consisted of α-ß barrel with additional haem group. Conclusion: Present study aims to provide knowledge on industrial dye degrading enzymes, choosing the suitable enzyme for industrial set up and to help in understanding the experimental laboratory requirements as well.

Azo Compounds/metabolism , Peroxidase/chemistry , Laccase/chemistry , NADH, NADPH Oxidoreductases/chemistry , Temperature , Azo Compounds/chemistry , Textile Industry , Biodegradation, Environmental , Computer Simulation , Enzyme Stability , Peroxidase/metabolism , Lactase/metabolism , Coloring Agents/metabolism , NADH, NADPH Oxidoreductases/metabolism
Braz. arch. biol. technol ; 63: e20180573, 2020. tab, graf
Article in English | LILACS | ID: biblio-1132185


Abstract This work reports the study of the potential application of Zn/TiO2 catalysts, obtained by the sol-gel method, in processes of environmental decontamination through the reactions of photodegradation of textile dye, followed by electrospray mass spectrometry. The catalysts synthesis was performed according to a 2² factorial design with repetition at the central point. The characterization techniques used were: N2 adsorption measurements (BET method), scanning electron microscopy with energy dispersive X-ray (MEV/EDS), X-ray diffraction and point of zero charge (PZC). The photocatalytic tests were performed in batch in the presence of sunlight, and to evaluate the degradation kinetics study, a rapid direct injection electrospray mass spectrometry (DI-ESI-MS) method has been developed. By the photocatalytic tests, the calcination temperature of 400 °C has shown the best results of discoloration for the reactive Orange-122 dye (99.76%) in a reaction time of 2h. The discoloration kinetics were a pseudo-first order, and a statistical analysis was performed to investigate the effects of the variables and to optimize the conditions of discoloration to the dye. After the reactional time of 2 h, an ion of m/z 441.5 was detected by ESI-MS, indicating that the photocatalytic process was effective for the degradation of the dye to secondary compounds.

Azo Compounds/toxicity , Biodegradation, Environmental , Decontamination/methods , Tandem Mass Spectrometry/methods , Environmental Restoration and Remediation/methods , Waste Water , Photochemistry , Textiles/toxicity , Microscopy, Electron, Scanning , Catalysis , Catalytic Domain , Spectrometry, Mass, Electrospray Ionization , Coloring Agents , Photobioreactors , Models, Theoretical
Int. j. odontostomatol. (Print) ; 13(4): 446-451, dic. 2019. tab, graf
Article in Spanish | LILACS | ID: biblio-1056483


RESUMEN: Las papilas fungiformes pigmentadas de la lengua, cuyas siglas son PFPT, del inglés Pigmented fungiform papillae of the tongue, es una condición asintomática, no progresiva que se presenta en personas de piel oscura, en las cuales las papilas fungiformes cambian de su color rosado natural, a una gama de café a negro. El objetivo de nuestro estudio es reportar y describir las caractetísticas clínicas, dermatoscópicas e histológicas de la PFPT por primera vez en una serie de pacientes ecuatorianos. Estudio prospectivo simple en el Centro de Especialidades Dermatológicas Garzón, período de dos años. El criterio de inclusión fue cambio de coloración a nivel lingual, se recolectaron datos demográficos, clínicos; fotografías, dermatoscopía, y biopsia, para tinción con hematoxilina-eosina y Fontana-Mason. Examinamos 8.640 pacientres, 15 (12 mujeres, 3 varones) fueron diagnosticados de PFPT. La edad promedio fue 31 años, todos fueron mestizos, con fototipo de piel predominante III y IV. El tiempo de evolución promedio en años fue 5,8. Ninguno tuvo antescedentes familiares o personales relacionados a la patología. La evaluación clínica demostró que el patrón de distribución de acuerdo a la clasificación de Holzwanger en la gran mayoría fue tipo II (13/15). En todos los casos la dermatoscopía y la histología fueron específicas demostrando hallazgos típicos y comprobatorios de PFPT.

ABSTRACT: The pigmented fungiform papillae of the tongue, whose acronyms are PFPT, of the English Pigmented fungiform papillae of the tongue, is an asymptomatic, nonprogressive condition that occurs in dark-skinned people, in which the fungiform papillae change their color natural pink, to a range of brown to black. The aim of our study is to report and describe the clinical, dermatoscopic and histological characteristics of the PFPT for the first time in a series of Ecuadorian patients. A simple prospective study at the Garzón Dermatological Specialty Center, a two-year period. The inclusion criteria was lingual change of color, demographic, clinical data were collected; photographs, dermatoscopy, and biopsy, for staining with hematoxylin-eosin and FontanaMason. We examined 8,640 patients, 15 (12 women, 3 men) were diagnosed with PFTP. The range of age was 31 years, all were mestizos, with skin phototype predominant III and IV. The range of evolution time in years was 5.8. None had family or personal precedents related to the pathology. The clinical evaluation showed that the pattern of distribution according to the Holzwanger classification in the great majority was type II (13/15). In all cases, the dermatoscopy and histology were specific, demonstrating typical and evidential findings of PFPT.

Humans , Male , Female , Child , Adolescent , Adult , Middle Aged , Skin Neoplasms , Taste Buds/pathology , Tongue Diseases/pathology , Hyperpigmentation/pathology , Melanins/analysis , Tongue Diseases/etiology , Biopsy , Prospective Studies , Demographic Data , Mycosis Fungoides/complications , Hyperpigmentation/etiology , Dermoscopy/methods , Coloring Agents , Ecuador
Rev. chil. obstet. ginecol. (En línea) ; 84(6): 425-434, dic. 2019. tab
Article in Spanish | LILACS | ID: biblio-1092758


Resumen Objetivo Evaluar el rendimiento diagnóstico de la técnica de azul patente (disponible en todo el territorio nacional) en el ganglio centinela para la estadificación del cáncer cérvico uterino y en-dometrial. Método Estudio prospectivo realizado entre enero de 2014 y diciembre de 2018. Se evaluó la técnica de azul patente para la detección de ganglio centinela en la estadificación del cáncer cérvico uterino y endometrial, antes de la linfadenectomía pélvica estándar. La inyección del azul patente se aplicó en el cuello uterino (1 cc 1 cm de profundidad y 1 cc superficial) a las 3 y 9 horas, 20 minutos antes del inicio de la cirugía (laparotomía o laparoscópica). La identifica-ción y extracción del ganglio centinela fue realizado por un ginecólogo oncólogo certificado y evaluado mediante histología tradicional con hematoxilina y eosina (H&E). Resultado Se realiza-ron un total de 80 cirugías. El ganglio centinela se identificó en 75 (94%) pacientes, 60 (75%) bilateralmente; Con una detección media de 1,9 nodos por paciente. El sitio de identificación más frecuente fue la fosa obturatriz (43,9%), seguida de los vasos ilíacos externos. Otro 2,6% de los nodos fueron encontrados en sitios poco comunes. Entre los ganglios linfáticos seleccio-nados, 10 casos fueron positivos para el cáncer. No hubo ganglio centinela falso negativo. La tasa de detección fue del 83%, con una especificidad del 95%. Conclusiones Los datos aquí expuestos nos permiten estandarizar e implementar el uso de gan-glio centinela con azul patente. El uso de GC adecua la cirugía a la necesidad de la paciente, con una clara disminución en la incidencia de complicaciones asociadas a la linfadenectomía. Este trabajo forma parte de un estudio inicial el cual se debe complementar con el uso de la tin-ción de verde de indocianina y el estudio anatomo patológico con ultraestadiaje para obtener una validación e implementación adecuada del GC en la etapificación en cáncer de cérvix y endo-metrio.

SUMMARY Objective To assess the diagnostic performance of patent blue dye technique (available in the whole country) in sentinel lymph node for cervical and endometrial cancer staging. Methods A prospective cohort study was conducted between January 2014 to December 2018. Patent blue dye technique was assessed for the detection of sentinel lymph node in cervical and endometrial cancer staging, before standard pelvic lymphadenectomy. Blue dye injection was applied in the cervix (1cc 1cm deep and 1cc superficial) at 3 and 9 hour, 20 minutes prior start-ing a surgery (laparotomy or laparoscopic). The sentinel lymph node was collected by a certified surgeon and assessed by traditional histologic hematoxylin and eosin stain. Results A total of 80 surgeries were performed. The sentinel lymph node was identified in 75 (94%) patients, 60 (75%) bilaterally; with an average detection of 1,9 nodes per patient. The most common site of identifi-cation was the obturator fossa, followed by the external iliac vessels (43,9%). 2,6% of the nodes were found in uncommon sites. 10 lymph nodes were cancer-positive. There were no false neg-ative sentinel node.Overall in our cohort the detection rate was 83% for specificity 95%. Conclusions Our data presented in this publication allow us to safely standardize and implement a sentinel lymph node technique with patent blue. This technique will allow us to adapt the sur-gery for the patient's needs, diminishing the incidence of complications associated with lym-phadenectomy. This is the first stage of our work which we must complement with indocyanine green and pathological study with ultrastaging to obtain an adequate validation and implementa-tion of sentinel node in cervical and endometrial cancer staging.

Humans , Female , Adult , Middle Aged , Aged , Uterine Cervical Neoplasms/surgery , Endometrial Neoplasms/surgery , Coloring Agents , Sentinel Lymph Node/surgery , Uterine Cervical Neoplasms/diagnosis , Endometrial Neoplasms/diagnosis , Laparoscopy , Sentinel Lymph Node/anatomy & histology , Indocyanine Green
Arq. bras. med. vet. zootec. (Online) ; 71(4): 1158-1164, jul.-ago. 2019. graf, ilus
Article in English | ID: biblio-1038609


The aim of this study was to evaluate the immediate effects of 0.05% brilliant blue on corneal endothelium of horses. Thirty-eight corneas of 19 horses, male or female, of different ages were studied. Corneas were randomly divided into two groups. Group 1: Corneal endothelium was covered with 0.3mL of brilliant blue 0.05% for 60 seconds followed by rinsing with a balanced salt solution. Group 2: Corneal endothelium was covered with BSS for 60 seconds. The corneas were excised with an 8mm trephine and prepared to analyze posterior endothelial surface using a light microscope (24 corneas) and a scanning electron microscope (14 corneas). The equine posterior corneal endothelium surface observed by optical microscopy and scanning electron microscopy revealed a continuous layer of polygonal cells of uniform size and shape in both the control and treatment groups. Due to non-normal residuals at ANOVA mean comparison, a generalized linear model was utilized at 5% level of significance. The chi-square test stated that treatment and control group were not different statistically. The 0.05% brilliant blue did not cause damage to equine corneal endothelium.(AU)

Objetivou-se avaliar os efeitos imediatos de uma solução de 0,05% de azul brilhante sobre o endotélio da córnea de equinos. Trinta e oito córneas de 19 cavalos, machos ou fêmeas, de diferentes idades foram estudadas. As córneas foram divididas aleatoriamente em dois grupos. Grupo 1: O endotélio corneano foi perfundido com 0,3mL de azul brilhante 0,05% durante 60 segundos seguido por irrigação com uma solução salina balanceada. Grupo 2: O endotélio corneano foi perfundido com BSS durante 60 segundos. As córneas foram posteriormente excisadas com trépano de 8mm e preparadas para análise endotelial utilizando um microscópio óptico (24 córneas) e um microscópio eletrônico de varredura (14 córneas). A análise da superfície posterior do endotélio da córnea equina observada por microscopia óptica e microscopia eletrônica de varredura revelou uma camada contínua de células poligonais de tamanho e forma uniformes tanto no grupo controle quanto no grupo tratamento. Devido aos resíduos não normais na comparação da média de ANOVA, utilizou-se um modelo linear generalizado com nível de significância de 5%. Evidenciou-se com o teste qui-quadrado que não houve diferença estatística entre o grupo controle e o grupo tratamento. O azul brilhante de 0,05% não causou dano ao endotélio corneano de equinos.(AU)

Animals , Reagent Kits, Diagnostic/veterinary , Endothelium, Corneal , Coloring Agents/analysis , Horses
Odontol. vital ; (30): 59-64, ene.-jun. 2019. tab
Article in Spanish | LILACS, SaludCR | ID: biblio-1091414


Resumen Objetivo: Evaluar la estabilidad de color de tres resinas compuestas tipo flow, mediante un colorímetro digital tras contacto durante 30 días con bebidas gaseosas. Materiales y métodos: 21 discos de 8 mm de diámetro y 2 mm de espesor fueron construidos con resina flowAlpha, Brilliant, Wave y Opallis, la evaluación de color se realizó mediante colorímetro digital y el peso con balanza de precisión, posterior al contacto en agua destilada durante 24 horas. Los discos fueron subdivididos en cuatro subgrupos (n=7) y sumergidos por 30 días en 10 ml de Coca-Cola, Fanta o saliva artificial, tras lo cual una nueva evaluación de color y peso fue ejecutada. Los datos analizados mediante las pruebas estadísticas Kruskal Wallis, Wilcoxon, Anova y Tukey. Resultados: La resina AlphaFlow presentó mayor resistencia a la variación del color después de 30 días al contacto con las bebidas gaseosas evaluadas, la Coca-Cola desencadenó mayor modificación de color en los dos materiales, sin diferencia significativa entre peso inicial y el final entre los materiales. Conclusiones: La resina ALPHA FLOW presentó mayor estabilidad al cambio de color, Coca-Cola fue la bebida gaseosa con mayor influencia en el cambio de color; sin modificación en cuanto al peso.

Abstract Objective: Evaluatethe color stability of three flow composite resins, by a digital colorimeter after contactfor 30 days with softdrinks. Materials and methods: 21 discs of 8 mm diameter and 2 mm thickNess were constructed with flowAlpha, Brilliant, Wave and Opallis resin, the color evaluation was performed by digital colorimeter and theweight with precision balance, after contact in distilled waterfor 24 hours. The discs were subdivided into four subgroups (n = 7) and submerged for 30 days in 10 ml of Coca-Cola, Fantaor artificial saliva, aftera new evaluation of color and weight was performed. The data was analyzed by the Kruskal Wallis, Wilcoxon, Anova and Tukey statistical tests. Results: Alpha Flow resin showed greater resistanceto color variation after 30 days in contact with the gaseous beverages evaluated, Coca-Cola showed greater color modification in materials, without significant difference between initial weight and the final weight between the materials. Conclusions: Alpha Flow resin showed greater stability to the color change, Coca-Cola was the gaseous drink with greater influence in the color change; No changes in weight.

Tooth Discoloration , Carbonated Beverages/adverse effects , Composite Resins/analysis , Coloring Agents
Int. j. odontostomatol. (Print) ; 13(1): 19-22, mar. 2019. tab, graf
Article in English | LILACS | ID: biblio-990059


ABSTRACT: The objective of this study was to evaluate the color alteration of four brands of artificial teeth (Art Plus, Trilux, Bionote and Biolux), after immersion in color solutions of coffee, red wine and urucum. We used 80 artificial teeth, which were standardized with 2 mm thickness. Then, they were subjected to finishing and polishing, and divided into 4 groups (n = 05), which were immersed in one of the 3 types of dye, plus distilled water (control). The samples were immersed daily for 4 hours, then they were removed, washed in tap water, dried with absorbent paper and immersed in distilled water for the subsequent hours in a biological glasshouse at 37 ºC, for 21 days. The evaluation of the color change was made in the periods of 0, 7, 14 and 21 days, by means of the tristimulus colorimeter. The data were subjected to the ANOVA and Tukey test with a 5 % significance. The results showed that the urucum was the substance that caused the greatest staining while the coffee and the wine did not show statistical difference. Regarding trademarks, Trilux presented a statistical difference compared to the other commercial brands, revealing colorimetric alteration only in the 14-day period. It was concluded that the composition of the artificial teeth, the type of pigmenting agent and the immersion time determine the color change.

RESUMEN: El objetivo de este estudio fue evaluar la alteración de color de cuatro marcas de dientes artificiales (Art Plus, Trilux, Bionote y Biolux), después de inmersión en soluciones colorantes de café, vino tinto y urucum. Se utilizaron 80 dientes artificiales, los cuales fueron estandarizados con 2 mm de espesor. En seguida, los mismos fueron sometidos al acabado y pulido, y divididos en 4 grupos (n = 5), los cuales fueron inmersos en uno de los 3 tipos de colorante, más agua destilada (control). Las muestras permanecieron inmersas diariamente durante 4 horas, luego fueron retiradas, lavadas en agua corriente, secas con papel absorbente e inmersas en agua destilada por las horas subsiguientes en invernadero biológico a 37 ºC, por 21 días. La evaluación del cambio de color se realizó en los períodos de 0, 7, 14 y 21 días, por medio del colorímetro tristimulo. Los datos fueron sometidos a la prueba ANOVA y Tukey con un 5 % de significancia. Los resultados demostraron que el urucum fue la sustancia que provocó mayor manchado mientras que el café y el vino no presentaron diferencia estadística. En cuanto a las marcas comerciales, el Trilux presentó una diferencia estadística en comparación con las otras marcas comerciales, revelando alteración colorimétrica sólo en el período de 14 días. Se concluyó que la composición de los dientes artificiales, el tipo de agente pigmentante y el tiempo de inmersión determinan el cambio de color.

Humans , Tooth, Artificial , Tooth Discoloration , Acrylic Resins , Wine , Materials Testing , Analysis of Variance , Coffee , Colorimetry , Coloring Agents , Immersion
Arq. gastroenterol ; 56(1): 41-44, Jan.-Mar. 2019. tab, graf
Article in English | LILACS | ID: biblio-1001321


ABSTRACT BACKGROUND: Esophageal cancer is the eighth most common cancer. The prognosis is bleak in patients with advanced stages. Patients with early disease have a better prognosis than those with advanced stage. There are several techniques for the screening of premalignant and superficial lesions including chromoendoscopy. OBJECTIVE: This article aimed to determine the effectiveness of chromoendoscopy with toluidine blue combined with Lugol's solution for diagnosis of esophageal premalignant and superficial neoplastic lesions in high risk patients. METHODS: Routine white light upper endoscopy was performed. Toluidine blue was sprayed from the gastroesophageal junction to 20 cm of the dental arch. Then the uptake dye areas were characterized. Later Lugol's solution was sprayed. Areas with less-intense staining were characterized. Biopsy of the toluidine blue capturing areas and areas with less-intense staining of Lugol's solution were taken. In the cases where lesions were not evidenced after application of dyes, biopsies four quadrants of the esophageal mucosa were taken. The samples were evaluated by a digestive pathologist. RESULTS: Barrett's esophagus was the most common premalignant lesion and the early neoplastic lesion was adenocarcinoma with a sensitivity of 100%, specificity 85.7%, positive predictive value 30%, negative predictive value 100%, positive likelihood ratio 7 negative likelihood ratio 0. CONCLUSION: Chromoendoscopy with toluidine blue combined with Lugol's solution is a useful tool in the screening of esophageal premalignant lesions and superficial neoplasms.

RESUMO CONTEXTO: O câncer de esôfago é o oitavo câncer mais comum. O prognóstico é sombrio em pacientes com estágios avançados. Pacientes com doença precoce têm um melhor prognóstico do que aqueles com estágio avançado. Existem várias técnicas para a triagem de lesões pré-malignas e superficiais, incluindo cromoendoscopia. OBJETIVO: Este artigo objetivou determinar a efetividade da cromoendoscopia com azul de toluidina combinada com a solução de Lugol para o diagnóstico de lesões neoplásicas pré-malignas e superficiais esofágicas em pacientes de alto risco. MÉTODOS - A endoscopia de luz branca de rotina foi realizada de forma rotineira. O azul do toluidina foi pulverizado desde a junção gastroesofágica até 20 cm da arcada dentária. As áreas impregnadas pela tintura da tomada foram então caracterizadas. Mais adiante a solução de Lugol foi pulverizada. Áreas com coloração menos intensa foram caracterizadas. Foram realizadas biópsias das áreas de captura de azul de toluidina e áreas com coloração menos intensa da solução de Lugol. Nos casos onde as lesões não foram evidenciadas após a aplicação das tinturas, foram feitas biópsias em quatro quadrantes da mucosa esofágica. As amostras foram avaliadas por um patologista especializado. RESULTADOS: O esôfago de Barrett foi a lesão pré-maligna mais frequente e a lesão neoplásica precoce foi adenocarcinoma com sensibilidade de 100%, especificidade de 85,7%, valor preditivo positivo de 30%, valor preditivo negativo 100%, razão de verossimilhança positiva 7 e razão de verossimilhança negativa 0. CONCLUSÃO: A cromoendoscopia com azul de toluidina combinada com a solução de Lugol é uma ferramenta útil na triagem de lesões pré-malignas esofágicas e neoplasias superficiais.

Humans , Male , Female , Adult , Precancerous Conditions/diagnostic imaging , Esophageal Neoplasms/diagnostic imaging , Esophagoscopy/methods , Early Detection of Cancer/methods , Precancerous Conditions/pathology , Tolonium Chloride/administration & dosage , Barrett Esophagus/pathology , Barrett Esophagus/diagnostic imaging , Esophagitis, Peptic/diagnostic imaging , Cross-Sectional Studies , Predictive Value of Tests , Prospective Studies , Sensitivity and Specificity , Coloring Agents/administration & dosage , Esophageal Mucosa/pathology , Esophageal Mucosa/diagnostic imaging , Iodides/administration & dosage , Middle Aged
Article in English | WPRIM | ID: wpr-764061


BACKGROUND AND OBJECTIVE: The characteristics of human hematopoietic stem cells are conditioned by the microenvironment of the bone marrow, where they interact with other cell populations, such as mesenchymal stem cells and endothelial cells; however, the study of this microenvironment is complex. The objective of this work was to develop a 3D culture system by magnetic levitation that imitates the microenvironment of human HSC. METHODS AND RESULTS: Human bone marrow-mesenchymal stem cells, umbilical cord blood-hematopoietic stem cells and a non-tumoral endothelial cell line (CC2811, Lonza®) were used to develop organotypic multicellular spheres by the magnetic levitation method. We obtained viable structures with an average sphericity index greater than 0.6, an average volume of 0.5 mm3 and a percentage of aggregation greater than 70%. Histological studies of the organotypic multicellular spheres used hematoxylin and eosin stains, and an evaluation of vimentin expression by means of immunohistochemistry demonstrated an organized internal structure without picnotic cells and a high expression of vimentin. The functional capacity of human hematopoietic stem cells after organotypic multicellular spheres culture was evaluated by multipotency tests, and it was demonstrated that 3D structures without exogenous Flt3L are autonomous in the maintenance of multipotency of human hematopoietic stem cells. CONCLUSIONS: We developed organotypic multicellular spheres from normal human cells that mimic the microenvironment of the human hematopoietic stem cells. These structures are the prototype for the development of complex organoids that allow the further study of the biology of normal human stem cells and their potential in regenerative medicine.

Biology , Bone Marrow , Coloring Agents , Endothelial Cells , Eosine Yellowish-(YS) , Hematopoietic Stem Cells , Hematoxylin , Humans , Immunohistochemistry , Mesenchymal Stem Cells , Methods , Organoids , Regenerative Medicine , Stem Cells , Umbilical Cord , Vimentin
Article in English | WPRIM | ID: wpr-761902


BACKGROUND: This study aimed to observe the cartilaginous matrix production in SRY (sex determining region Y)-box 9 (SOX9)- and/or telomerase reverse transcriptase (TERT)-transfected chondrocytes from monolayer to three-dimensional (3D) culture.

Alcian Blue , Cartilage , Chondrocytes , Clothing , Coloring Agents , Eosine Yellowish-(YS) , In Vitro Techniques , Proteoglycans , Real-Time Polymerase Chain Reaction , Regeneration , Telomerase , Tissue Engineering , Transfection
Article in English | WPRIM | ID: wpr-776710


Anthraquinone dyes, which contain anthraquinone chromophore groups, are the second largest class of dyes after azo dyes and are used extensively in textile industries. The majority of these dyes are resistant to degradation because of their complex and stable structures; consequently, a large number of anthraquinone dyes find their way into the environment causing serious pollution. At present, the microbiological approach to treating printing and dyeing wastewater is considered to be an economical and feasible method, and reports regarding the bacterial degradation of anthraquinone dyes are increasing. This paper reviews the classification and structures of anthraquinone dyes, summarizes the types of degradative bacteria, and explores the possible mechanisms and influencing factors of bacterial anthraquinone dye degradation. Present research progress and existing problems are further discussed. Finally, future research directions and key points are presented.

Adsorption , Anthraquinones , Chemistry , Classification , Metabolism , Bacteria , Metabolism , Biodegradation, Environmental , Coloring Agents , Chemistry , Classification , Metabolism , Hydrogen-Ion Concentration , Temperature
Article in Chinese | WPRIM | ID: wpr-774524


Because the red and bright color of corolla is the main indicator for the quality assessment of good safflower,the dyed safflower is sometimes found at the herbal market,what is influence on this herb quality and efficacy. A total of 127 safflower samples was therefore collected from different cultivating areas and herbal markets in China to develop a rapid method to identify the dyed safflower. Near-infrared spectroscopy(NIRS) combined with characteristic identification,high performance liquid chromatography(HPLC),principal component analysis(PCA) and partial least squares regression analysis(PLS) were employed to differentiate safflower from dyed safflower samples,and further quantify the levels of the 6 dyes,i.e. tartrazine,carmine,sunset yellow,azorubine,acid red 73 and orange Ⅱ in the dyed safflower. The results indicated that the 50 safflower samples and 77 dyed safflower samples were located at different regions in PCA cluster diagram by NIR spectra. Tartrazine,carmineand and sunset yellow were found in the 77 dyed safflower samples with the amounts of 0. 60-3. 66,0. 11-1. 37,0. 10-0. 71 mg·g-1,respectively. It indicated that the three dyes were the common and main dyes in the dyed safflower. However,azorubine,acid red 73 and orange Ⅱ were not detected in all herb samples. A total of 62 dyed safflower samples were chosen as calibration samples to develop the model for estimating the amount of dyes in dyed safflower. The estimating accuracy was verified by another 15 dyed safflower samples. The values of tartrazine,carmine and sunset yellow in dyed safflower samples were compared between the NIRS and HPLC methods. Each value of mean absolute difference(MAD) was less than 5%. The correlation coefficients of tartrazine,carmineand and sunset yellow were 0. 970,0. 975,0. 971,respectively. It indicated the data quantified by NIRS and HPLC were consistence. It is concluded that NIRS can not only differentiate safflower from dyed safflower,but also quantify the amount of the dyes. NIRS is suitable for rapidly identify the quality of safflower.

Azo Compounds , Benzenesulfonates , Carmine , Carthamus tinctorius , Chemistry , China , Coloring Agents , Naphthalenesulfonates , Spectroscopy, Near-Infrared , Tartrazine