Search results for "Digest"
showing 10 items of 3038 documents
Fissurectomy and anoplasty in posterior normotensive chronic anal fissure.
2021
Purpose: Anal Fissure (AF) is the second most frequent proctological disease in Italy. Chronic AF (CAF) most common located at the posterior anal commissure (CAPF). CAPF are thought to be associated with hypertonic internal anal sphincter (IAS) but manometric findings showed that a normotonic IAS is present in the 20-40%. Sphincterotomy is often recommended as treatment of choice for CAF independently from IAS tone; nevertheless, this approach appears less logical for CAF with normotonic IAS, as in those cases there’s a higher risk of post-operative anal incontinence. The aim of this study is to evaluate the results of fissurectomy and anoplasty with V-Y cutaneous advancement flap, as treat…
Anal Fistula in Crohn’s Disease
2015
Transmural bowel inflammation in Crohn’s disease (CD) is associated with the development of fistulas, which are tracts or communications that connect two epithelial-lined organs. Common sites for fistulas connect the intestine to bladder (enterovesical), to skin (enterocutaneous), to bowel (enteroenteric), and to the vagina (enterovaginal).
Oval fiber posts do not improve adaptation to oval-shaped canal walls.
2011
Abstract Introduction Oval fiber posts attempt to provide better adaptation to root canals. The hypothesis of this study was that there are no differences in adaptation of oval and circular fiber posts to canal walls. Methods Posts were inserted in 20 canals; 10 were oval, and 10 were circular. The posts were cemented with composite cement. Coronal, middle, and apical sections were observed through a microscope. The space occupied by the post and the maximum distance between it and the canal wall were calculated. The 2 groups were compared with analysis of variance. In all the analyses the level of significance was set at P Results The proportion of space occupied by the post showed no sign…
The determination of trace element concentrations in fly ash samples using ultrasound-assisted digestion followed with inductively coupled plasma opt…
2009
Abstract A method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of trace element (chromium, copper, lead, nickel, vanadium and zinc) concentrations in fly ash samples was developed. All the measurements were performed in robust plasma conditions. Ultrasound-assisted digestion procedures using digestion solutions of aqua regia and hydrofluoric acid (HF) resulted in recovery rates of over 80% for all the analyte elements. Ultrasound-assisted two-step digestion with digestion solutions of 6 mL of HNO3 (Step 1) and 3 mL of HNO3 + 3 mL of HF (Step 2) resulted in recovery rates of over 92% for all the ana…
Flow-injection spectrofluorimetric determination of paracetamol
1990
Abstract A flow-injection spectrofluorimetric determination of paracetamol is reported, based on the oxidation of the analyte with potassium hexacyanoferrate(III) immobilized on an anion-exchange resin, the fluorescence being enhanced with N,N′-dimethylformamide. Concentrations of paracetamol in the range 0.04–17.60 mg l−1 are determined with a relative standard deviation of 1.5%. The injection rate is 25 samples h−1. The influence of foreign species and the determination of paracetamol in several pharamaceutical formulations are also reported.
Optimization of selenium determination in human milk and whole blood by flow injection hydride atomic absorption spectrometry.
1998
abstract A flow injection hydride atomic absorption spectrometry (FI-HAAS) method was developed for determining selenium in human milk and whole blood after microwave digestion of the sample. The sample (2 mL human milk or 0.25 mL blood) was introduced into the microwave vessel with 1.5 mL HN03 and 0.25 mL H202 and 300 W (4 min) and 600 W (4 min) were applied. The digestion was completed by heating to 140 C (2-3 h). Se (VI) was reduced to Se (IV) with hydrochloric acid. The instrumental conditions for FI-HAAS (concentrations of reducing agent and carrier acid, flow rate of argon carrier gas, and sample volume injected) were optimized. The detection limit of the proposed method was 0.23 ng/m…
Towards a microbial thermoelectric cell.
2013
Microbial growth is an exothermic process. Biotechnological industries produce large amounts of heat, usually considered an undesirable by-product. In this work, we report the construction and characterization of the first microbial thermoelectric cell (MTC), in which the metabolic heat produced by a thermally insulated microbial culture is partially converted into electricity through a thermoelectric device optimized for low ΔT values. A temperature of 41°C and net electric voltage of around 250–600 mV was achieved with 1.7 L baker’s yeast culture. This is the first time microbial metabolic energy has been converted into electricity with an ad hoc thermoelectric device. These results might…
In Vitro Bioavailability of Phenolic Compounds from Five Cultivars of Frozen Sweet Cherries (Prunus aviumL.)
2008
The bioavailability of phenolic compounds from five cultivars of frozen sweet cherries was assessed by a digestion process involving pepsin-HCl digestion (to simulate gastric digestion) and pancreatin digestion with bile salts (to simulate small intestine conditions) and dialyzed to assess serum- and colon-available fractions. After pepsin digestion, the % recovery of total phenolics, relative to the original starting material, increased, whereas the % anthocyanins did not change. Following pancreatic digestion and dialysis, the total phenolics in the IN (serum-available) fraction was about 26–30% and the OUT (colon-available) fraction was about 77–101%. The anthocyanin content in the IN fr…
Evaluación de la digestión in vitro de compuestos bioactivos de arándanos
2018
Estudios in vivo e in vitro han demostrado que las antocianinas provenientes de los arándanos ejercen efectos biológicos beneficiosos sobre la salud de los consumidores. Existen métodos de análisis in vitro que permiten evaluar la estabilidad de las antocianinas en relación con la interacción de los distintos componentes de las matrices alimentarias, el pH, la temperatura, presencia de inhibidores o potenciadores de absorción y presencia de enzimas. El objetivo del trabajo fue poner a punto la metodología de digestión in vitro y evaluar la biodisponibilidad in vitro de antocianinas presentes en jugo de arándanos y un snack formulado con jugo de arándanos y manzana. Los resultados indican qu…
p Natural polyphenols as anti-inflammatory agents p
2009
Celiac Disease is a worldwide spread condition affecting 1:100-1:200 individuals. It is a permanent food intolerance to ingested gluten in genetically predisposed subjects. In this review we analyze the biochemical markers of the disease going from laboratory findings to histology passing through genetics. Gluten intolerance is a unique model of autoimmune disease in which we can recognize the main environmental factor (gluten) and the more complex genetic background. In additional way, serological markers for monitoring the disease and a safe and effective therapy (gluten free diet) are also available. In deed the environmental factor such as gluten intake is necessary to trigger the disea…