Adsorption of Pb (II) ions on variable charge oxidic calcined substrates with chemically modified surface.

Background: The paper describes lead ion adsorption on variable charge oxidic calcined substrates with chemically modified surfaces. Amphoteric oxides of iron, aluminum, titanium, and manganese, change their surface electric charge after acid or alkaline treatment, letting cationic or anionic adsorption reactions from aqueous solutions. This property allows using them as adsorbing substrate for heavy metals retention in water treatment systems.

EUS-guided drainage: Summary of therapeutic EUS consortium meeting.

EUS-guided drainage is a safe and efficacious endoscopic technique for biliary, pancreatic, and gallbladder decompression. Recent literature has described many successful procedural techniques and devices to achieve EUS-guided drainage. This consortium gathering advanced endoscopists with expertise in both ultrasonography and therapeutic endoscopy, discuss the introduction to learning several EUS-guided drainage approaches, devices, and technology involved, possible obstacles to certain procedural and all potential complications.

Endoscopic ultrasonography guided drainage: summary of consortium meeting, May 21, 2012, San Diego, California.

Endoscopic retrograde cholangiopancreatography (ERCP) is the preferred procedure for biliary and pancreatic drainage. While ERCP is successful in about 95% of cases, a small subset of cases are unsuccessful due to altered anatomy, peri-ampullary pathology, or malignant obstruction. Endoscopic ultrasound-guided drainage is a promising technique for biliary, pancreatic and recently gallbladder decompression, which provides multiple advantages over percutaneous or surgical biliary drainage.

Evaluation of the effect of nimodipine o.d. (extended release) vs nimodipine t.i.d. in the treatment of peripheral vertigo.

Summary: Vertigo has a negative impact on quality of life; therefore, it is important to find an effective and convenient therapy that allows patients to continue their everyday tasks as soon as possible and to have a better quality of life.

Methods: There were two formulations used to assess the effectiveness in vertigo treatment from peripheral origin: nimodipine administrated three times daily (Nimotop®) 30 mg versus nimodipine AP administrated once daily (Tropocer®) 90 mg; both of them in a administrated in a prospective, randomized, double-blind, double dummy, multicenter and parallel-group study, where patients with peripheral vertigo defined as a score ≥7 on the Vertigo-Dizziness Differential Diagnosis Score were included. The patients were evaluated by vertigo severity index and vestibular disability index.

Pancreatic necrosectomy using covered esophageal stents: a novel approach.

Background: Endoscopic necrosectomy for necrotizing pancreatitis has been increasingly used as an alternative to surgical or percutaneous interventions. The use of fully covered esophageal self-expandable metallic stents may provide a safer and more efficient route for internal drainage. The aim of this study was to evaluate the safety and efficacy of endoscopic treatment of pancreatic necrosis with these stents.

Liver transplantation for autoimmune hepatitis in Peru: outcomes and recurrence.

Background: Liver transplantation is the only therapy for end-stage liver disease. Cirrhosis secondary to autoimmune hepatitis (AIH) is an indication in 4-6% of adult transplants.

Aims: To describe the outcomes and recurrence of AIH in liver transplant patients.

Bioactive indicators related to bioelements of eight unifloral honeys.

Honey is the most popular bee product used by man, with nutritional and medicinal purposes. Its great diversity is attributed to numerous factors (bee type, visited flora, environment, and management). The quality of honey is controlled with routine parameters (free acidity, diastase activity, reducing sugars, ash, water, hydroxymethyfurfural, and sucrose contents).

On-line generation and hydrolysis of methyl borate for the spectrophotometric determination of boron in soil and plants with azomethine-H.

A continuous-flow system for boron determination in soils and plants with spectrophotometric detection using the azometihine-H-boron complex method was developed. In order to avoid the interferences of concomitants present in samples and to increase the sensitivity, the element was separated on-line from the matrix by methyl borate generation. For this purpose, a concentrated sulfuric acid sample solution was combined with methanol in 1:3 ratio which produce enough heating for the esterification reaction without external source.

On-line electrochemical preconcentration and flame atomic absorption spectrometric determination of manganese in urine samples.

A sensitive and selective method was developed for the determination of traces of manganese in urine using on-line electrochemical preconcentration followed by flame atomic absorption spectrometry detection. A home made flow-through polypropylene cell (4.5cm longx0.

Determination of aluminum by electrothermal atomic absorption spectroscopy in lubricating oils emulsified in a sequential injection analysis system.

The sequential injection (SIA) technique was applied for the on-line preparation of an "oil in water" microemulsion and for the determination of aluminum in new and used lubricating oils by electrothermal atomic absorption spectrometry (ET AAS) with Zeeman-effect background correction. Respectively, 1.0, 0.

Continuous flow system for lead determination by faas in spirituous beverages with solid phase extraction and on-line copper removal.

A continuous flow system for the determination of lead in home made spirituous beverages was developed. The determination was based on the formation of a neutral chelate of the element with ammonium pyrrolidine dithiocarbamate, its adsorption onto a minicolumn packed with sodium faujasite type Y synthetic zeolite, followed by elution with methyl isobutyl ketone and determination by flame atomic absorption spectrometry. Ethanol and copper interfere strongly in the determination and therefore, must be separated prior to the analysis.

Flow injection determination of bismuth in urine by successive retention of Bi(III) and tetrahydroborate(III) on an anion-exchange resin and hydride generation atomic absorption spectrometry.

Bismuth as BiCl(4)(-) and BH(4)(-) ware successively retained in a column (150mm x 4mm, length x i.d.) packed with Amberlite IRA-410 (strong anion-exchange resin).

Flow injection on-line dilution for zinc determination in human saliva with electrothermal atomic absorption spectrometry detection.

An automated method is described for the determination of zinc in human saliva by electrothermal atomic absorption spectrometry (ET AAS) after on-line dilution of samples with a significant reduction of sample consumption per analysis (<0.4 mL including the dead volume of the system). In order to fulfill this aim without changing the sample transport conduits during the experiments, a flow injection (FI) dilution system was constructed.

Determination of some cationic species in temporary teeth.

Some cationic species (Ca, Mg, Sr, Cu, Zn and Pb) have been determined in temporary teeth (n = 67) sampled from a children population living in Mérida, Venezuela, with a mean age of 87.76 +/- 34.50 months within a range from 29 to 151 months.