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1.
Rev. cienc. salud (Bogotá) ; 19(1): 74-87, ene.-abr. 2021. tab, graf
Article in English | LILACS | ID: biblio-1289167

ABSTRACT

Abstract Introduction: Multipurpose solutions (MPS) for soft contact lenses (SCL) play an essential role in inhibiting potentially pathogenic agents. Their antimicrobial effectiveness is assessed in vitro and their safety in vivo, with clinical trials that include a combination of different solutions and lens materials. The objective is to assess the biocompatibility of a new SCL MPS produced in Colombia that contains polyhexamethylene biguanide (PHMB) and to determine its antimicrobial activity. Materials and Methods: This was a crossover study with 25 subjects who did not wear lens and who were fitted with different combinations of five SCL materials with either MPS or control physiological saline solution (CS). Corneal thickness, conjunctival hyperemia, corneal staining, and comfort were assessed after two hours of wearing SCL. Antimicrobial effectiveness was measured using ISO 14729 standard assays. Results: When considering SCL material, there was a statistically significant difference between the new MPS and the CS for Comfilcon A (p < 0.05). There was no statistical or clinically significant difference for corneal thickness or corneal staining between the combination of lens material and new MPS with the CS (p > 0.05). After two hours of lens insertion, comfort scores were higher than 7.8. The MPS reduced bacteria colony forming units (CFU) in over 3 log, and fungal CFU in over 1.0 log. Conclusions: The new MPS met the antimicrobial standards of ISO 14729, is considered safe and biocompatible with the ocular surface and retains high comfort levels.


Resumen Introducción: las soluciones multipropósito (SMP) para lentes de contacto blandos (LCB) desempeñan un papel esencial en la inhibición de agentes potencialmente patógenos. Su efectividad antimicrobiana se evalúa in vitro, y su seguridad, in vivo, con ensayos clínicos que incluyen una combinación de diferentes soluciones y materiales para lentes. El objetivo es evaluar la biocompatibilidad de una nueva SMP producida en Colombia que contiene polihexametileno biguanida (PHMB) y determinar su actividad antimicrobiana. Materiales y métodos: estudio cruzado con 25 sujetos no usuarios de lentes, que fueron adaptados con cinco combinaciones diferentes de materiales de LCB con una nueva SMP o solución salina fisiológica de control (CS). El grosor corneal, la hiperemia conjuntival, la tinción corneal y la comodidad se evaluaron después de dos horas de uso del LC. La efectividad antimicrobiana se midió utilizando ensayos estándar ISO 14729. Resultados: considerando el material del LCB, solo hubo una diferencia estadísticamente significativa entre la nueva SMP y el CS para el Comfilcon A (p < 0.05). Tampoco hubo diferencias estadísticamente o clínicamente significativas para el grosor corneal o la tinción corneal, entre la combinación del material del lente y la nueva SMP con el CS (p > 0.05). Después de dos horas de uso del lente, las puntuaciones de confort fueron superiores a 7.8. La SMP redujo las unidades formadoras de colonias (UFC) de bacterias en más de 3 log, y las UFC fúngicas en más de 1.0 log. Conclusiones: la nueva SMP cumplió con los estándares antimicrobianos de ISO 14729, y se considera segura y biocompatible con la superficie ocular, con altos niveles de confort.


Resumo Introdução: as soluções multipropósito (SMP) para lentes de contato macias (LCM) apresentam um papel essencial na inibição de agentes potencialmente patógenos. Sua eficácia como agente antimicrobiano se valia in vitro, e sua segurança, in vivo, como ensaios clínicos que incluem uma combinação de diferentes soluções e materiais para lentes. O objetivo é avaliar a biocompatibilidade de uma nova SMP produzida na Colômbia a base de polihexametileno biguanida (PHMB) e determinar seu potencial antimicrobiano. Materiais e métodos: estudo cruzado com 25 indivíduos não usuários de lentes, que foram adaptados com cinco combinações diferentes de LCM como uma nova SMP ou solução salina fisiológica como controle (CS). A espessura da córnea, a hiperemia conjuntival, a coloração da córnea e a comodidade, foram avaliadas após duas horas de uso da LCB. A eficácia antimicrobiana foi medida com ensaios padrão ISO 14729. Resultados: considerando o material da LCB, houve apenas uma diferença estatisticamente significativa entre a nova SMP e o CS, paro o Comfilcon A (p <0.05). Não houve diferença estatisticamente ou clinicamente significativa para a espessura da córnea ou a coloração da córnea, entre a combinação do material da lente e a nova SMP com o controle CS (p > 0.05). Após duas horas de uso, as pontuações de conforto foram superiores a 7,8. A SMP reduziu as unidades formadoras de colônias (UFC) de bactérias em mais de 3 log, e as UFC fúngicas em mais de 1.0 log. Conclusões: a nova SMP cumpriu com os padrões antimicrobianos ISO 14729, é considerada segura e biocompatível com a superfície ocular, com altos níveis de conforto.


Subject(s)
Humans , Contact Lenses, Hydrophilic , Hyperemia , Stem Cells
2.
Gac. méd. Méx ; 157(1): 30-36, ene.-feb. 2021. tab, graf
Article in Spanish | LILACS | ID: biblio-1279070

ABSTRACT

Resumen Introducción: Se requiere analizar diversos parámetros para el control de calidad adecuado de las unidades de sangre de cordón umbilical (USCU) cuando se utilizan con fines terapéuticos. Objetivo: Optimizar las unidades formadoras de colonias (UFC) de cultivos clonogénicos y detectar el genoma del virus del papiloma humano (VPH) en USCU. Métodos: Se incluyeron 141 muestras de sangre de cordón umbilical (SCU), de segmento y de UFC de cultivos clonogénicos de USCU. Se realizó extracción de ADN, cuantificación y amplificación por PCR del gen endógeno GAPDH. Se detectó el gen L1 del VPH con los oligonucleótidos MY09/MY11 y GP5/GP6+; los productos de PCR se migraron en electroforesis de agarosa. El ADN purificado de las UFC se analizó mediante electroforesis de agarosa y algunos ADN, con la técnica sequence specific priming. Resultados: La concentración de ADN extraído de UFC fue superior comparada con la de SCU (p = 0.0041) y la de segmento (p < 0.0001); así como la de SCU comparada con la de segmento (p < 0.0001). Todas las muestras fueron positivas para la amplificación de GAPDH y negativas para MY09/MY11 y GP5/GP6+. Conclusiones: Las USCU criopreservadas fueron VPH netativas; además, es factible obtener ADN en altas concentraciones y con alta pureza a partir de UFC de los cultivos clonogénicos.


Abstract Introduction: Analysis of several markers is required for adequate quality control in umbilical cord blood units (UCBU) when are used for therapeutic purposes. Objective: To optimize colony-forming units (CFU) from clonogenic cultures and to detect the human papillomavirus (HPV) genome in UCBU. Methods: One hundred and forty-one umbilical cord blood (UCB), segment or CFU samples from UCBU clonogenic cultures were included. DNA extraction, quantification and endogenous GAPDH gene PCR amplification were carried out. Subsequently, HPV L1 gene was detected using the MY09/MY11 and GP5/GP6+ oligonucleotides. PCR products were analyzed with electrophoresis in agarose gel. CFU-extracted purified DNA was analyzed by electrophoresis in agarose gel, as well as some DNAs, using the SSP technique. Results: CFU-extracted DNA concentration was higher in comparison with that of UCB (p = 0.0041) and that of the segment (p < 0.0001), as well as that of UCB in comparison with that of the segment (p < 0.0001). All samples were positive for GAPDH amplification and negative for MY09/MY11 and GP5/GP6+. Conclusions: Cryopreserved UCBUs were HPV-negative. Obtaining CFU DNA from clonogenic cultures with high concentrations and purity is feasible.


Subject(s)
Humans , Female , Adult , Young Adult , Papillomaviridae/isolation & purification , DNA, Viral/isolation & purification , Hematopoietic Stem Cells/virology , Genome, Viral , Fetal Blood/virology , Papillomaviridae/genetics , Histocompatibility Testing , HeLa Cells , Cryopreservation , Cell Line , Polymerase Chain Reaction/methods , Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating) , Electrophoresis, Agar Gel , Fetal Blood/cytology
3.
Invest. clín ; 57(4): 321-329, dic. 2016. tab
Article in Spanish | LILACS | ID: biblio-841123

ABSTRACT

Se evaluó la eficacia antimicrobiana de las nanopartículas de plata (NPsAg) incorporadas al adhesivo (primer) colocado en el esmalte dental adyacente a la aparatología ortodóncica fija (brackets). Se realizó un estudio experimental in vitro en 40 premolares, los cuales se dividieron en dos grupos con brackets, uno cementado con primer convencional y otro adicionado con NPsAg; se colocaron en medios de cultivo, previamente inoculados con Streptococcus mutans, y se tomaron muestras para hacer cultivos y conteo de unidades formadoras de colonias (UFC) al día 1, 15 y 30. Se observó una disminución de la presencia de Streptococcus mutans en las muestras a los 15 días de colocado el primer con la agregación de nanopartículas, aunque tal efecto se redujo a los 30 días. Esta reducción del efecto de las nanopartículas puede deberse a la inexistencia de limpieza mecánica, lo cual favoreció la agregación bacteriana sobre el biofilm, afectando su efecto antimicrobiano. Esto sugiere la necesidad de realizar estudios in vivo que permitan observar el comportamiento de los biomateriales en el medio bucal. Las NPsAg agregadas al primer resultan una herramienta eficaz para prevenir la desmineralización del esmalte alrededor de la aparatología ortodóncica fija.


The antimicrobial efficacy of the silver nanoparticles (NPsAg), incorporated into the adhesive (primer) placed in the enamel adjacent to fixed orthodontic appliances (brackets), was evaluated. An experimental study was performed on 40 premolars in vitro, which were divided into two groups with brackets, one cemented with conventional primer and another added with NPsAg, placed in culture media previously inoculated with Streptococcus mutans, and sampled for culturing and counting colony forming units (UFC) on days 1, 15 and 30. A decrease in the presence of Streptococcus mutans in the samples after 15 days with nanoparticle aggregation was observed, and a reduction in the effect of said nanoparticles after 30 days. This reduction of the nanoparticles effects can be due to the absence of mechanical cleaning, which favored the bacterial aggregation on the biofilm, affecting its antimicrobial effect. This suggest the need for realizing studies in “vivo” which will allow the observation of the behavior of the biometals on the buccal medium. The NPsAg added to the primer are an effective tool to prevent the demineralization of the enamel around the fixed orthodontic appliances.


Subject(s)
Orthodontic Appliances/microbiology , Silver , Dental Cements , Metal Nanoparticles , Anti-Bacterial Agents/pharmacology , In Vitro Techniques , Cross-Sectional Studies
4.
Odontol. vital ; jun. 2016.
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1506845

ABSTRACT

Se realizó un estudio acerca del análisis de la carga microbiana en las lámparas de fotocurado en cuanto al uso y desuso de barreras adhesivas de protección, con el fin de que los resultados sirvan para hacer conciencia sobre el uso de las barreras adhesivas de protección, para resguardar tanto al profesional como a su ambiente de trabajo, y a los pacientes, evitando además la contaminación cruzada entre ellos, como con el medio oral y los demás instrumentos. Para la investigación se tomó una muestra de 47 lámparas, 24 con barrera y 23 sin barrera, para así determinar la cantidad de unidades formadoras de colonias por superficie, y además la presencia o ausencia de Escherichia Coli como indicador de microorganismo patógeno.


It has been made a study of the analysis of the microbial load in dental curing lights in the use and disuse of adhesive protective barriers, with the goal that the results serve to raise awareness on use of adhesive protective barriers to protect the professional, their work environment and patients, while avoiding cross-contamination between them, as with the oral environment and other instruments. For this research the sample were 47 lamps, 24 with barrier and 23 without barrier, to determine the number of colony forming units per surface, and also the presence or absence of Escherichia coli as pathogen indicator.

5.
Rev. odontol. mex ; 20(2): 77-81, abr.-jun. 2016. tab
Article in Spanish | LILACS | ID: biblio-961554

ABSTRACT

Se estudiaron 380 alumnos del primer año en la Facultad de Odontología (n = 380) (periodo 2012-2013) a fin de determinar el índice CPOD y relacionar si la caries está asociada con los microorganismos Streptococcus y Lactobacillus. El índice CPOD (cariado, perdido y obturado) se registró usando los parámetros de la Organización Mundial de la Salud. Se tomaron muestras de saliva de cada alumno y se determinaron las unidades formadoras de colonias de Streptococcus y Lactobacillus. La media de los índices CPOD fue de 7.25 ± 4.59. Las mujeres (n = 278) y hombres (n = 102) presentaron una media de índices CPOD de 7.11 ± 4.66 y 7.29 ± 4.57, respectivamente. Encontramos que los alumnos de 19 años presentaron menos caries que los estudiantes de otras edades. Tanto Streptococcus y Lactobacillus se correlacionaron significativamente entre sí, así como en la incidencia de caries. Un incremento en el número de estos microorganismos, especialmente de Streptococcus mutans, se asociaron con el incremento en CPOD.


Three hundred and eighty first year students of the National School of Dentistry (UNAM) (n = 380) (academic year 2012-2013), were assessed targeting determination of DMFT (decayed, missing, lost teeth) index as well as to establish a relationship of whether caries is associated to Lactobacillus and Streptococcus microorganisms. DMFT index was recorded using World Health Organization (WHO) parameters. Samples of all students were taken and colony-forming units of Streptococcus and Lactobacillus were determined. DMFT indexes mean was established at 7.25 ± 4.59. Females (n = 278) and males (n = 102) exhibited mean DMFT indexes of 7.11 ± 4.66 and 7.29 ± 4.57 respectively. Results revealed that 19 year old students exhibited lesser amounts of caries than students of other ages. Both Streptococcus and Lactobacillus were significantly correlated to each other as well as to caries incidence. Increase in the number of the aforementioned micro-organisms, especially Streptococcus mutans, were associated to DMFT increase.

6.
Pesqui. vet. bras ; 35(6): 518-524, June 2015. tab
Article in Portuguese | LILACS | ID: lil-766189

ABSTRACT

A mastite é a principal afecção do gado destinado à produção leiteira, que impacta significativamente a cadeia produtiva do leite, com reflexos ainda para a saúde pública. Estudou-se aspectos relacionados à etiologia, celularidade e de contagem bacteriana em 10 propriedades leiteiras, localizadas no Estado de São Paulo. Foram examinadas 1148 vacas em lactação, totalizando 4584 glândulas mamárias. Foram considerados os casos, em que houve isolamento de estafilococos coagulase positiva (SCP) e estafilococos coagulase negativa (SCN). Os resultados revelaram microbiota com vários patógenos e diferentes espécies de SCN (128 casos) e SCP (45), Staphylococcus aureus(90), Streptococcus agalactiae(70), Streptococcus dysgalactiae (69), Streptococcus uberis(29), Corynebacteriumspp. (230), Klebsiella pneumoniae(28), Klebsiella oxytoca(2), Escherichia coli(15), Enterobactersp. (3). Os resultados de contagem de células somáticas (CCS) relacionados aos SCP e SCN não mostraram diferenças entre as propriedades avaliadas, entretanto com diferenças significantes ao se avaliar a CCS entre os dois grupos de estafilococos, como pode ser evidenciado ao comparar SCN Discreto e SCP exuberante (P<0,01), SCP Discreto e SCP exuberante (P<0,001) e SCN moderado e SCP exuberante (P<0,01). A avaliação da CCS relacionada à intensidade da infecção, considerando-se como crescimento discreto o isolamento de até nove colônias, moderado de dez a 29 colônias e exuberante, com 30 ou mais colônias, revelou para ambos os grupos de estafilococos que quanto maior o número de unidades formadoras de colônias (UFC), a CCS é mais elevada, sendo sempre maior nos casos de SCP. Conclui-se que quando há maior número de UFC, há concomitantemente maior CCS/mL de leite, no caso dos SCP e SCN...


Mastitis is the main affection of cattle intended for dairy production, which significantly impacts the milk production chain, with consequences yet to public health. It was studied aspects related to etiology, cellularity and bacterial count in 10 dairy farms, in the State of São Paulo. There were examined 1148 milking cows, totaling 4584 mammary glands. Cases in which there was isolation coagulase positive staphylococci (CPS) and coagulase-negative staphylococci (CNS) were considered. The results showed microbiota with various different pathogens and CNS (128 cases) and CPS (45), Staphylococcus aureus (90), Streptococcus agalactiae (70), Streptococcus dysgalactiae (69), Streptococcus uberis (29), Corynebacterium spp . (230), Klebsiella pneumoniae (28), Klebsiella oxytoca (2), Escherichia coli (15), Enterobacter spp. (3). The somatic cell count (SCC) related to CPS and CNS showed no differences among the evaluated properties, although with significant differences when evaluating the SCC between both groups of staphylococci, as evidenced by comparing discreet CNS and exuberant CPS (P <0.01), discreet CPS and exuberant CPS (P <0.001) and moderate SCN and exuberant SCP (P <0.01). The evaluation of SCC was related to the intensity of infection, considering how slight growth isolation of up to nine colonies, moderate ten to 29 colonies and lush, with 30 or more colonies, revealed for both groups of staphylococci that the higher the number of colony forming units (CFU), SCC is higher being larger in cases of CPS. The results indicate that the importance of both CPS and CNS when considering the high occurrence of the evaluated properties and the fact that it raises the SCC, which compromises the quality of milk. We conclude that when there is a larger number of CFU, is concomitantly higher SCC/ml of milk, in the case of CPS and CNS...


Subject(s)
Animals , Female , Cattle , Breast-Milk Substitutes , Mastitis, Bovine/epidemiology , Mastitis, Bovine/prevention & control , Quality Control , Staphylococcus , Animal Husbandry/methods , Disease Prevention , Proteolysis , Stem Cells
7.
Rev. bras. hematol. hemoter ; 31(supl.1): 19-24, maio 2009. tab
Article in Portuguese | LILACS | ID: lil-519669

ABSTRACT

O sangue periférico tem sido utilizado como fonte de células progenitoras hematopoéticas para o transplante de medula óssea, única aplicação clínica bem estabelecida até o momento para as células-tronco. Mais recentemente, além das células progenitoras hematopoéticas, estudos têm identificado também no sangue periférico a presença de células-tronco mesenquimais. Estas células apresentam as mesmas características e marcadores de superfície que as células-tronco mesenquimais da medula óssea e são capazes de diferenciação em células do tecido conjuntivo como osteócitos, condrócitos, adipócitos e miócitos. Embora sua origem e destino ainda sejam desconhecidos, a presença destas células no sangue periférico de indivíduos adultos representa um importante instrumento na área de medicina regenerativa e terapia celular. O conhecimento de marcadores imunofenotípicos que possam caracterizar as CTM de forma mais prática e objetiva e de possíveis estratégias capazes de aumentar o número destas células na circulação são fundamentais para o avanço de pesquisas clínicas baseadas na sua utilização.


Peripheral blood has been routinely used as a source of hematopoietic progenitor cells for allogeneic and autologous bone marrow transplantation. Recent studies have demonstrated that a low number of mesenchymal stem cells are also present in the peripheral blood. They share the same surface markers as bone marrow-derived mesenchymal stem cells and are capable of differentiating into mesenchymal lineage cells including osteocytes, adipocytes and chondrocytes. Although their origin and destination are unclear, their presence in the peripheral blood of adults seems to represent an important and powerful tool for regenerative medicine and cell therapy.


Subject(s)
Humans , Cell- and Tissue-Based Therapy , Fibroblast Growth Factors , Hematopoietic Stem Cells , Mesenchymal Stem Cells , Nerve Regeneration
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