RESUMO
El objetivo de este trabajo fue evaluar el efecto de soluciones de irrigación endodónticas solas y combinadas sobre iones calcio y fosfato de la dentina radicular ex vivo. Se emplearon 56 discos de dentina obtenidos del tercio medio radicular de premolares inferiores unirradiculares extraídos por razones ortodóncicas. Los discos se dividieron al azar en 8 grupos (n=7). Grupo I: agua destilada (AD), Grupo II: hipoclorito de sodio (NaClO) 1 %, Grupo III: EDTA 17 %, Grupo IV: ácido maleico (AM) 5 %, Grupo V: ácido acético (AA) 5 %, Grupo VI: EDTA 17 % + NaClO 1 %, Grupo VII: AM 5 % + NaClO 1 %, Grupo VIII: AA 5 % + NaClO 1 %. Los segmentos de dentina permanecieron en contacto a 37° C durante 5 min y 2,5 minutos en cada solución cuando se usaron en forma sucesiva. Se determinó la concentración de iones calcio de las soluciones mediante espectrometría de absorción atómica y la concentración de iones fosfatos mediante colorimetría (Wienner Lab.). Los resultados se expresaron en mg/ml/gr de tejido. Para el análisis estadístico se utilizó ANOVA y Test de Tukey. AA 5 % y EDTA 17 % se comportaron de manera similar utilizados solos durante 5 minutos, NaClO 1 % no mostró diferencias con el AD. AM 5 % eliminó significativamente más calcio y fosfato que todos los grupos. Todas las soluciones desmineralizaron la dentina, pero AM 5 % durante 5 min fue la solución que más afectó el componente inorgánico de la dentina.
The aim of the present study was to evaluate ex vivo irrigating solutions effect under calcium and phosphates dentin ions, using them alone and combined. In this study 56 dentin discs where used. They were obtained from middle third of mandibular single-root premolars extracted for orthodontics reasons. Discs were randomly divided into 8 groups (n:7). Group I: Distilled water (DW), Group II: 1 % sodium hypochlorite (NaOCl), Group III: 17 % EDTA, Group IV: 5 % maleic acid (MA), Group V: 5 % acetic acid (AA), Group VI: 17 % EDTA + 1 % NaOCl, Group VII: 5 % MA + 1 % NaOCl, Group VIII: 5 % AA + 1 % NaOCl. Dentin segments were kept in contact with irrigating solutions at 37°C for 5 minutes, when used alone, or for 2.5 minutes when used combined. After that, calcium ions (using absorption atomic spectrometry) and phosphorus ions (by colorimetry Wienner Lab.) were determined. Results were expressed in mg/ml/g tissue. Statistical analysis was performed by ANOVA and Tukey test. 5 % AA and 17 % EDTA eliminated similar concentrations of calcium and phosphates ions from dentin at 5 minutes exposure time, while 1 % NaOCl did not present statistical differences with control. 5 % MA eliminated significantly more calcium and phosphates ions than the rest of analyzed groups. Every tested solutions demineralized human dentin, but 5 % MA used for 5 minutes did it the most.
Assuntos
Blefarite , Pestanas , Infestações por Ácaros , Chile , Humanos , Infestações por Ácaros/epidemiologia , Prevalência , UniversidadesRESUMO
OBJECTIVE: To determine the presence of Demodex spp. in the eyelashes' pilosebaceous unit in volunteers of one campus of a private university. MATERIALS AND METHODS: The volunteers underwent anamnesis, biomicroscopic study and samples were taken of 8 eyelashes, 2 of each eyelid of both eyes. The eyelashes were mounted on a slide and observed under a light microscope to determine the presence and quantity of mites. RESULTS: 200 volunteers were recruited, determining the prevalence of Demodex spp. in 54 (27%) of them. Of the positive cases, 40 (74.1%) presented signs and/or symptoms of blepharitis, 43 (79.7%) presented the mite in one eye and an average infestation rate of 0.65 Demodex spp. per eyelash was obtained. CONCLUSIONS: Approximately one in four of the volunteers studied without a diagnosis of blepharitis was a carrier of the parasite, of which a significant percentage presented some type of sign and/or symptom of this pathology which was related to a higher rate of infestation (p<0.05).
Assuntos
Infecções Oculares Parasitárias/epidemiologia , Pestanas/parasitologia , Infestações por Ácaros/epidemiologia , Universidades/estatística & dados numéricos , Adolescente , Adulto , Idoso , Animais , Chile/epidemiologia , Infecções Oculares Parasitárias/diagnóstico , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Infestações por Ácaros/diagnóstico , Prevalência , Adulto JovemRESUMO
The ability to manipulate the structure and function of promising systems via external stimuli is emerging with the development of reconfigurable and programmable multifunctional materials. Increasing antifungal and antitumor activity requires novel, effective treatments to be diligently sought. In this work, the synthesis, characterization, and in vitro biological screening of pure α-Ag2WO4, irradiated with electrons and with non-focused and focused femtosecond laser beams are reported. We demonstrate, for the first time, that Ag nanoparticles/α-Ag2WO4 composite displays potent antifungal and antitumor activity. This composite had an extreme low inhibition concentration against Candida albicans, cause the modulation of α-Ag2WO4 perform the fungicidal activity more efficient. For tumor activity, it was found that the composite showed a high selectivity against the cancer cells (MB49), thus depleting the populations of cancer cells by necrosis and apoptosis, without the healthy cells (BALB/3T3) being affected.
Assuntos
Antifúngicos/farmacologia , Antineoplásicos/farmacologia , Candida albicans/efeitos dos fármacos , Elétrons , Nanopartículas Metálicas/química , Óxidos/química , Prata/química , Tungstênio/química , Neoplasias da Bexiga Urinária/tratamento farmacológico , Animais , Apoptose , Células 3T3 BALB , Proliferação de Células , Humanos , Nanopartículas Metálicas/administração & dosagem , Nanopartículas Metálicas/efeitos da radiação , Camundongos , Óxidos/efeitos da radiação , Prata/efeitos da radiação , Células Tumorais Cultivadas , Tungstênio/efeitos da radiação , Neoplasias da Bexiga Urinária/patologia , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Two recombinant protease inhibitors from Bauhinia bauhinioides, rBbKI (kallikrein inhibitor) and rBbCI (cruzipain inhibitor) were evaluated for insecticidal activity against workers and soldiers of Nasutitermes corniger (order: Isoptera; family: Termitidae) through the inhibitors' effect on the insect's gut enzymes. The inhibitor rBbKI was more effective than rBbCI in inhibiting the termite's gut enzymes. The kallikrein inhibitor showed termiticidal activity in workers with an LC50 of 0.9â¯mgâ¯mL-1 after 4 days. Conversely, rBbKI did not affect the survival of soldiers and rBbCI did not show termiticidal activity against N. corniger. The two inhibitors showed different specificity towards the termite's gut enzymes, representing interesting tools to characterize N. corniger enzymes. The different effects of rBbKI and rBbCI on the termite's enzymes and survival may be linked to slight structural differences between these inhibitors.
Assuntos
Bauhinia/química , Inseticidas/farmacologia , Isópteros/enzimologia , Inibidores de Proteases/farmacologia , Animais , Cisteína Endopeptidases , Humanos , Calicreínas/antagonistas & inibidores , Proteínas de Protozoários/antagonistas & inibidores , Especificidade por SubstratoRESUMO
PURPOSE: To assess the impact of bloodstream infection (BSI) in patients with head and neck cancer (HNC) in the cetuximab era. METHODS: We prospectively analysed the epidemiology, microbiology and outcomes of 51 BSI episodes occurring in 48 patients with HNC (2006-2017). We performed a retrospective matched-cohort study (1:2) to determine the risk factors for BSI. Finally, we compared patients who died with those who survived to identify risk factors for mortality. RESULTS: The most frequent HNC localization was the oropharynx (43%), and pneumonia was the most frequent source (25%). Gram-positive BSI occurred in 55% cases, mainly due to Streptococcus pneumoniae (21%), and among Gram-negatives, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae were the most frequent. Hypoalbuminemia (OR 8.4; 95% CI, 3.5-19.9), previous chemotherapy (OR, 3.2; 95% CI, 1.3-7.4) and cetuximab therapy (OR, 2.8; 95% CI, 1.6-6.7) were significant risk factors for BSI. Patients with BSI had a higher overall case-fatality rate than patients without BSI (OR, 4.4; 95% CI, 1.7-11.8). Hypoalbuminemia was an independent risk factor for the early (7 day) and overall (30 day) case-fatalities, with ORs of 0.8 (95% CI, 0.6-0.9) and 0.8 (95% CI, 0.7-0.97), respectively. The presence of comorbidities (OR, 7; 95% CI, 1.4-34) was also an independent risk factor for overall case-fatality. CONCLUSIONS: BSI causes high mortality in patients with HNC and is most often secondary to pneumonia. It occurs mainly among patients with hypoalbuminemia who receive treatment with cetuximab or chemotherapy. The development of BSI in patients with HNC impairs their outcome, especially in the presence of hypoalbuminemia and comorbidities.
Assuntos
Antineoplásicos Imunológicos/uso terapêutico , Cetuximab/uso terapêutico , Neoplasias de Cabeça e Pescoço/tratamento farmacológico , Hospedeiro Imunocomprometido , Sepse/imunologia , Adulto , Idoso , Feminino , Neoplasias de Cabeça e Pescoço/complicações , Neoplasias de Cabeça e Pescoço/imunologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Fatores de Risco , Sepse/epidemiologia , Sepse/microbiologia , Adulto JovemRESUMO
Little is known about the diversity of parasites of the deep-sea fish of the world's oceans. Here, a new species of monogenean parasite of the deep-sea skate Gurgesiella furvescens is described. Specimens of parasites were obtained from the skin of two specimens of the dusky finless skate, G. furvescens (Rajidae), in the vicinity of Valparaiso (33°S, 72°W), central Chile, from midwater trawl fishing at depths of 350-450 m. Both morphological and molecular analyses were conducted to provide a full description of the new species, named Acanthocotyle gurgesiella. For the molecular analyses, nuclear large subunit (LSU) rDNA and the mitochondrial gene cytochrome c oxidase 1 (COI) were used. From the morphological analysis and a comparison with the known species of the genus, A. gurgesiella can be identified by a combination of morphological characteristics, including the number of testes, number of radial rows of sclerites in the pseudohaptor, aperture of the genital pore and shape of the vitelline follicles. The results from the DNA analysis indicated that A. gurgesiella has a genetic divergence of 3.2-3.7% (LSU rDNA gene) from A. urolophi, the only congener species for which molecular data are available.
Assuntos
Doenças dos Peixes/parasitologia , Rajidae/parasitologia , Trematódeos/genética , Trematódeos/isolamento & purificação , Animais , Chile/epidemiologia , DNA Mitocondrial , DNA Ribossômico , Doenças dos Peixes/epidemiologia , Oceanos e Mares , Filogenia , Trematódeos/anatomia & histologia , Trematódeos/classificaçãoRESUMO
Resumen Objetivo: Determinar y comparar el rendimiento diagnóstico de las Reglas Ecográficas Simples (RES), Índice Morfológico Ecográfico (IME) e Índice de Riesgo de Malignidad de Jacobs (IRM) en el diagnóstico de benignidad o malignidad de un tumor anexial. Material y método: Estudio retrospectivo, transversal y analítico efectuado en el Hospital Militar de Especialidades de la Mujer y Neonatología de la Ciudad de México. Se incluyeron pacientes con diagnóstico ecográfico de tumor anexial intervenidas quirúrgicamente. Se estudió el rendimiento diagnóstico de los índices comparado con el diagnóstico histopatológico mediante tablas de contingencia. Resultados: Se analizaron 141 pacientes y 166 tumores; 22 casos fueron bilaterales. De la muestra analizada, 79 eran pacientes premenopáusicas y 62 posmenopáusicas. Los casos de neoplasia maligna fueron 43 (26%) y benigna 123 (74%). El Índice Morfológico Ecográfico tuvo sensibilidad de 98.8%, especificidad de 33.3%, valor predictivo positivo de 33.9% y valor predictivo negativo de 97.6%. Las Reglas Ecográficas Simples reportaron una sensibilidad de 97.2%, especificidad de 71.1%, valor predictivo positivo de 55.6% y valor predictivo positivo de 98.6%; y el Índice de Riesgo de Malignidad de Jacobs una sensibilidad de 72.7%, especificidad de 79.3%, valor predictivo positivo de 55.8% y valor predictivo positivo de 89.4%. Conclusiones: Las Reglas Ecográficas Simples son un modelo prequirúrgico que en 82% de los casos permitieron clasificar los tumores anexiales en benignos o malignos. Los casos indeterminados deben ser reevaluados por un ecografista experto. El método es reproducible por evaluadores de mediana experiencia y susceptible de aplicarse en instituciones hospitalarias de segundo y tercer nivel de atención.
Abstract Objective: To determine and compare the diagnostic performance of the Simple Ultrasound-Based Rules (SUR), Sonographic Morphology Index (SMI) and the Jacob´s Risk Malignancy Index (RMI) in the diagnosis of benignity or malignancy to an adnexal tumor. Materials and methods: Retrospective, cross-sectional and analytical study at the at the Hospital Militar de Especialidades de la Mujer y Neonatología of Mexico City. Patients with ultrasound diagnosis of adnexal tumor who underwent surgery were included. The diagnostic performance of the indices compared to histopathological diagnosis was studied using contingency tables. Results: 141 women and 166 tumors were included for analysis, 22 cases were bilateral. Of the sample analyzed, 79 were premenopausal and 62 postmenopausal. Cases of malignant neoplasm were 43 (25.9%) and benign 123 (74.1%). The SMI had a sensitivity of 98.8%, specificity of 33.3%, positive predictive value (PPV) of 33.9%, and negative predictive value (NPV) of 97.6%. SUR showed a sensitivity of 97.2%, specificity of 71.1%, PPV of 55.6% and NPV of 98.6%; And RMI had a sensitivity of 72.7%, specificity of 79.3%, PPV of 55.8% and NPV of 89.4%. Conclusions: The simple ultrasonographic rules are a presurgical model that in 82% of the cases allowed to classify the adnexal tumors in benign or malignant. Indeterminate cases should be reevaluated by an expert sonographer. The method is reproducible by evaluators of medium experience and susceptible of being applied in hospital institutions of the second and third level of care.
RESUMO
Pseudomonas syringae is a phytopathogenic bacterium that causes lesions in leaves during the colonisation process. The damage is associated with production of many virulence factors, such as biofilm and phytotoxins. The essential oils of Thymus vulgaris (thyme) and Origanum vulgare (oregano) have been demonstrated to inhibit P. syringae. The aim of this study was to investigate the effects of T. vulgaris and O. vulgare essential oils on production of virulence factors of phytopathogenic P. syringae strains, including anti-biofilm and anti-toxins activities. The broth microdilution method was used for determination of MIC and biofilm inhibition assays. Coronatine, syringomycin and tabtoxin were pheno- and genotypically evaluated. Both oils showed good inhibitory activity against P. syringae, with MIC values from 1.43 to 11.5 mg·ml-1 for thyme and 5.8 to 11.6 mg·ml-1 for oregano. Biofilm formation, production of coronatine, syringomycin and tabtoxin were inhibited by thyme and oregano essential oil in most strains. The results presented here are promising, demonstrating the bactericidal activity and reduction of virulence factor production after treatment with thyme and oregano oil, providing insight into how they exert their antibacterial activity. These natural products could be considered in the future for the control of diseases caused by P. syringae.
Assuntos
Óleos Voláteis/química , Óleos Voláteis/farmacologia , Origanum/química , Extratos Vegetais/farmacologia , Pseudomonas syringae/efeitos dos fármacos , Pseudomonas syringae/metabolismo , Thymus (Planta)/química , Fatores de Virulência/metabolismo , Aminoácidos/metabolismo , Proteínas de Bactérias/metabolismo , Dipeptídeos/metabolismo , Indenos/metabolismo , Testes de Sensibilidade MicrobianaRESUMO
The present work analyzes the effects of dietary chia seeds during postnatal life in offspring exposed to a sucrose-rich diet (SRD) from utero to adulthood. At weaning, chia seed (rich in α-linolenic acid) replaced corn oil (rich in linoleic acid) in the SRD. At 150 days of offspring life, anthropometrical parameters, blood pressure, plasma metabolites, hepatic lipid metabolism and glucose homeostasis were analyzed. Results showed that chia was able to prevent the development of hypertension, liver steatosis, hypertriglyceridemia and hypercholesterolemia. Normal triacylglycerol secretion and triacylglycerol clearance were accompanied by an improvement of de novo hepatic lipogenic and carnitine-palmitoyl transferase-1 enzymatic activities, associated with an accretion of n-3 polyunsaturated fatty acids in the total composition of liver homogenate. Glucose homeostasis and plasma free fatty acid levels were improved while visceral adiposity was slightly decreased. These results confirm that the incorporation of chia seed in the diet in postnatal life may provide a viable therapeutic option for preventing/mitigating adverse outcomes induced by an SRD from utero to adulthood.