Objetivo: comparar efectividad del polietilenglicol y manitol en la preparación intestinal mediante escala de Boston, pacientes de la consulta externa de gastroenterología, tercer trimestre, 2012. Pacientes y métodos: estudio prospectivo, transversal, experimental. Muestra de 100 pacientes aleatorizados en dos grupos: polietilenglicol y manitol, 50 en cada uno. A todos se les instauró dieta líquida el día previo al estudio e indicación para la ingesta de la solución a evaluar. Se realizó colonoscopia con evaluación endoscópica según escala de Boston. Resultados: la tolerancia a la preparación fue considerada fácil por 88% en el grupo polietilenglicol vs 100% del grupo manitol (p=0,041). El 98% del grupo manitol consideró que este medicamento tenía sabor agradable en comparación con polietilenglicol (78%) (p=0,002). El efecto adverso más frecuente en ambos grupos fue la náusea. El polietilenglicol alcanzó exploraciones completas con restos en un 82% colon derecho, 56% colon transverso y 72% colon izquierdo, mientras que con manitol prevaleció la exploración completa sin restos en 66%, 90% y 68% respectivamente (p<0,05). La puntuación global de la escala de Boston con polietilenglicol y manitol fue 6 vs 8 (p<0,05). Conclusiones: manitol resultó ser más efectivo que polietilenglicol para la preparación del colon en su totalidad y por segmentos.

Objective: To compare the effectiveness of polyethyleneglycol and mannitol bowel preparation by Boston scale, in patients from the outpatient gastroenterology in the third quarter of 2012. Method: Prospective, cross, experimental with a sample of 100 patients randomized to group polyethyleneglycol and mannitol group, 50 in each. All were introduced liquid diet the day before the test with the appropriate indication for the intake of the solution to evaluate and colonoscopy was performed endoscopic evaluation scale as Boston. Result: tolerance was considered easy preparation by 88% in polyethyleneglycol group vs 100% mannitol group (p=0.041). 98% mannitol group had considered that this medicine palatable compared with polyethyleneglycol (78%) (p=0.002). The most common adverse event in both groups was nausea. Polyethyleneglycol reached full scans with remains at 82% right colon, transverse colon 56% and 72% left colon, whereas mannitol prevailed without full exploration remains at 66%, 90% and 68% respectively (p<0,05). The overall rating scale was polyethyleneglycol Boston 6 vs 8 in the mannitol group (p<0,05). Conclusions: mannitol was more effective for the preparation of polyethyleneglycol entire colon and segments.

El hepatocarcinoma es la neoplasia primaria hepática más frecuente con una incidencia creciente en todo el mundo cuyo pronóstico está ligado con el diagnóstico temprano. Objetivos: Determinar la frecuencia del hepatocarcinoma en pacientes del Servicio de Gastroenterología del Hospital Militar "Dr. Carlos Arvelo" durante el período 2006-2011. Métodos: Trabajo retrospectivo y descriptivo. Se recolectaron historias médicas de 39 pacientes con ese diagnóstico. Resultados: Los rasgos demográficos fueron similares a los descritos en Occidente: predominio hombres (71,79%), edad promedio entre 60 y 69 años (35,8%). La primera causa fue por hepatitis C (35,89%), seguida por el alcohol (25,64%) y hepatitis B (15,38%). Para estadificación se usaron los criterios Barcelona Clinic Liver Cancer, siendo al momento del diagnóstico el estadio D el más frecuente (68,57%). El 28,20% recibió tratamiento. Sorafenib fue lo más utilizado, (7 pacientes) dado que ingresaban al Hospital en estadio terminal limitando las opciones terapéuticas. El 12,8% de los pacientes estaban vivos al momento de realizar el estudio. Conclusiones: El hepatocarcinoma es un tumor raro en nuestro medio. Frecuentemente produce pocos síntomas, manifestándose como descompensación de la función hepática en pacientes con cirrosis por lo que debe intensificarse la pesquisa, para lograr diagnóstico temprano y mejorar el pronóstico.

Hepatocellular carcinoma is the most common primary neoplasm liver with an increasing incidence worldwide whose prognosis is linked to early diagnosis. Objetives: To determine the frequency of hepatocellular carcinoma in patients from the Gastroenterology Service of the Military Hospital "Dr. Carlos Arvelo" during the period 2006-2011. Methods: Retrospective and descriptive. Were collected from medical records of 39 patients with that diagnosis. Results: The demographic features were similar to those described in the West: predominantly men (71.79%), average age between 60 and 69 (35.8%). The first cause was hepatitis C (35.89%), followed by alcohol (25.64%) and hepatitis B (15.38%). For staging criteria were used Barcelona Clinic Liver Cancer, being at the time of diagnosis, stage D the most common (68.57%). The 28.20% received treatment. Sorafenib was the most used, (7 patients) admitted to the hospital since end-stage limiting therapeutic options. 12.8% of patients were alive at the time of the study. Conclusions: Hepatocellular carcinoma is a rare tumor in our environment. Often produces few symptoms, manifesting as decompensation of liver function in patients with cirrhosis and should be intensified screening to achieve early diagnosis and improve prognosis.

A study from cows with mastitis was performed and Staphylococcus aureus was the predominant pathogen in 46.4 % among 153 studied strains from 276 milk samples of infected cows. Antibiotic resistance of 71 S. aureus isolates was determined in order to search resistant strains to antibiotics of clinical interest, as well as to determine their degree of multi-resistance. It was found that 60% of the S. aureus strains presented resistance to β-lactams, but none to oxacillin, teicoplamin or vancomycin. On the other hand, with the aim of reducing the use of current antibiotics and their associated resistance, a new formulation was introduced. The antimicrobial compounds (P22-P32), demonstrated to be effective in 55% of the 76 mastitis cases studied. The use of P22-P32 reduced the number of somatic cell to less than 300,000 SCC/mL-1 in 75.2 % of milk samples analyzed, normalizing the milk quality, fat and lactose levels and increasing the volume of production in 10.1 %.

A extração de fitases produzidas por fermentação em estado sólido de polpa cítrica foi estudada utilizando um processo de extração sólido-líquido em varias etapas. A adição de EDTA permite manter durante 24 horas a temperatura ambiente 90% da atividade inicial do caldo com a enzima extraída. Um planejamento fatorial 2², com 4 replicas no ponto central, foi desenvolvido para testar os valores de ph e agitação convenientes para a extração das enzimas. A interação entre ambos os fatores foi estadisticamente significativa. A atividade da enzima foi otimizada nos valores onde o pH (5.0) e a agitação (350 rpm) resultaram ser as melhores condições para extrair a enzima da matriz sólida. O ajuste do modelo matemático obtido mostra que é possível considerar a difusividade como o mecanismo que controla o processo de transferência de massa. A constante cinética que descreve este processo e a concentração de saturação foram 0.039 min-1 e 4.01 IU/mL respectivamente. A extração em varias etapas mostrou que nas duas primeiras etapas é possível recuperar 85% da fitase produzida.

The extraction of phytase produced by solid-state fermentation of citrus peel was studied employing a multistage leaching process. It was observed that the extracts containing EDTA retained over 90% of phytase activity at room temperature after 24 h after the leaching. A fractional design 2² (with 4 replicates at the central point) was carried out for testing the pH and agitation as process independent factors. Only the interaction between the pH and agitation showed a significant influence. These factors were optimized with a central composite design. Agitation at 300 rpm and pH at 5.0 were the best conditions to extract the enzyme from solid matrix. The modeling of the process indicated that diffusivity of the enzyme in the solvent was the controlling mechanism. The corresponding kinetic constant and saturation concentration in this process were 0.89 min-1 and 4.0 IU/mL, respectively. The multistage process indicated that after two steps, it was possible to recover 85% of total enzyme produced.

Biopreservation systems in foods are of increasing interest for industry and consumers. Bacteriocinogenic lactic acid bacteria and/or their isolated bacteriocins are considered safe additives (GRAS), useful to control the frequent development of pathogens and spoiling microorganisms in foods and feed. The spreading of bacterial antibiotic resistance and the demand for products with fewer chemicals create the necessity of exploring new alternatives, in order to reduce the abusive use of therapeutic antibiotics. In this context, bacteriocins are indicated to prevent the growth of undesirable bacteria in a food-grade and more natural way, which is convenient for health and accepted by the community. According to their properties, structure, molecular weight (MW), and antimicrobial spectrum, bacteriocins are classified in three different groups: lantibiotics and non-lantibiotics of low MW, and those of higher MW. Several strategies for isolation and purification of bacteriocins from complex cultivation broths to final products were described. Biotechnological procedures including salting-out, solvent extraction, ultrafiltration, adsorption-desortion, ion-exchange, and size exclusion chromatography are among the most usual methods. Peptide structure-function studies of bacteriocins and bacterial genetic advances will help to understand the molecular basis of their specificity and mode of action. Nisin is a good example of commercial success, and a good perspective is open to continue the study and development of new bacteriocins and their biotechnological applications. These substances in appropriate concentrations may be used in veterinary medicine and as animal growth promoter instead usual antibiotics, as well as an additional hurdle factor for increasing the shelf life of minimal processed foods.