CuO Elaboration and Studies of the Influence of Heat Treatment on the Structural Properties

In the present work we synthesize nano powders of CuO by precipitation method, using CuCl2 as precursor. The obtained powder has undergone a heat treatment annealing 100°C, and 450°C. Structural analysis by X-Ray diffraction, Fourier transform infrared (FTIR) microscopy and scanning electron microscopy (SEM) reveal that CuO nano particles are in nano graphs forms and with improved crystallization at 450°C, annealing temperature as monoclinic crystal lattice structure. The radius of NCs calculated by the Scherrer formula is 12.31 nm

Effect of stripe clearing on 4 grasses species and 2 broadleaves of caldenal

En la Región del Espinal, Distrito del Caldén, en la provincia de San Luis existe un fuerte proceso de agriculturización con la consecuente pérdida de remanentes de bosque nativo, peligro de conservación de especies nativas e invasión de especies exóticas. El objetivo del presente trabajo fue evaluar el efecto del desmonte en franjas sobre 6 especies del caldenal (4 gramíneas y 2 latifoliadas). El estudio se realizó en un campo a 15 km. al norte de la ciudad de Villa Mercedes (San Luis), sometido a un desmonte en franjas para uso agrícola en el año 2003. En 5 sitios ubicados en franjas remanentes de bosque nativo y 5 en bosque nativo sin desmonte, se trazaron transectas de 39 m de longitud, dirección NS y a lo largo de la misma se registraron las especies presentes en 14 unidades de muestreo de 1 m2. Los datos se analizaron utilizando IBM SPSS Statistics 19, mediante Métodos No Paramétricos, U de Mann-Whitney. El análisis estadístico mostró diferencias significativas (p<0.05) en Digitaria californica, Pappophorum pappiferum, Salsola kali y Cestrum parqui. El estudio demostró que el cultivo entre franjas de bosque nativo produjo un cambio en la frecuencia de poáceas nativas y de latifoliadas.In the region of “Espinal”, Calden Distrct in the province of San Luis there is a strong agriculturization process with the consequent loss of native forest remnants, conserving endangered native species and invasion of exotic species. The aim of this study was to evaluate the effect of the stripe clearing on 6 species of caldenal (4 grasses and 2 broa- dleaves). The study was conducted in a field 15 km to the north of the city of Villa Mercedes (San Luis), subjected to a strip-clearing for agricultural use, in the year 2003. On 5 sites into native forest remnants stripes and 5 into without clearing native forest, 39 m long tran- sects were laid, N-S direction, and along the same were recorded the presente species in 14 sampling units of 1 m2. Data were analyzed by IBM SPSS Statistics 19, through non- parametric methods, Mann-Whitney U. Statistical analysis showed significant differences (p <0.05) in Digitaria californica, Pappophorum pappiferum, Salsola kali and Cestrum par- qui. The study showed that the cultivation of native forest between stripes was a change in the frequency of native grasses and broadleaves.Fil: Ruiz, O. M.. Universidad Nacional de San Luis; Argentina;Fil: Luna, H. R.. Universidad Nacional de San Luis; Argentina;Fil: Bacha, Emmanuel Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - San Luis; Argentina; Universidad Nacional de San Luis; Argentina;Fil: Pedranzani, H.. Universidad Nacional de San Luis; Argentina;Fil: Gabutti, E.G.. Universidad Nacional de San Luis; Argentina

Perventricular device closure of muscular ventricular septal defects on the beating heart: technique and results

AbstractObjectiveBoth surgical management and percutaneous device closure of muscular ventricular septal defects have drawbacks and limitations. This report describes our initial experience with intraoperative device closure of muscular ventricular septal defects without cardiopulmonary bypass in 6 consecutive patients.MethodsA median sternotomy or a subxiphoid minimally invasive incision was performed. Under continuous transesophageal echocardiographic guidance, the right ventricle free wall was punctured, and a wire was introduced across the largest defect. The Amplatzer (AGA Medical Corporation, Golden Valley, Minn) muscular ventricular septal defect occluding device (a self-expandable double-disk device) was used. An introducer sheath was fed over the wire, with the sheath tip positioned in the left ventricle cavity. The device was then advanced inside the sheath and deployed by retracting the sheath. Associated cardiac lesions, if any, can then be repaired during cardiopulmonary bypass. A similar technique can also be applied for periatrial closure of complex atrial septal defects.ResultsThe initial 6 patients are presented. Cardiopulmonary bypass was not needed in any patient for placement of the device and needed in 4 patients for repair of concomitant malformations only (double-outlet right ventricle, aortic arch hypoplasia, pulmonary artery band removal). No complications from using this technique occurred. Discharge echocardiograms showed no significant shunting across the ventricular septum.ConclusionsPerventricular closure of multiple muscular ventricular septal defects is safe and effective. We believe that this could become the treatment of choice for any infant with muscular ventricular septal defects or any child with muscular ventricular septal defect and associated cardiac defects

The Efficiency of Trading Halts; Evidence from Bursa Malaysia

This paper undertakes a comprehensive evaluation of the efficacy of firm-specific trading halts in the Malaysian context. The paper examines a total of 291 trading halts that occurred over the five year period 2000 to 2004. In addition to examining the three variables commonly impacted by trading halts, stock price reaction, volatility of returns and trading volume, we also examine four additional parameters that could have material impact. These are (i) the type of halt whether voluntary or mandatory, (ii) type of news released, (iii) duration of halt and (iv) frequency. Based on our overall sample, trading halts result in a positive price reaction, increased volume and volatility. We find evidence of information leakage, significant difference between voluntary and mandatory halts and the type of news released during halt to have a huge impact. The duration of halt has isolated impact and is largely inconsequential. The frequency of halts does not seem to matter. While these results broadly conform with previous studies of trading halts in other markets, our refined analysis by subcategory showed some interesting differences. The two key differences were the significantly positive price reaction for the sample of mandatory halts and the lower volatility for voluntary halts. We attribute the positive price reaction of mandatory halts to the peculiarity of regulation and the resulting survivor bias. We argue that the lower volatility for voluntary halts particularly for those in the good news category, imply that these stocks are being repriced. With the exception of some subsets, our overall results appear to be strongly supportive of The Price Efficiency hypothesis of trading halts which argues that trading halts help disseminate information and enhance the price discovery process

SCSBRS 113 - Tio Taka: cultivar de arroz irrigado obtida através de seleção recorrente.

O objetivo deste trabalho é mostrar e discutir os principais resultados que levaram ao lançamento da SCSBRS 113 ? TioTaka para plantio em Santa Catarina e apresentar a metodologia utilizada no desenvolvimento da referida cultivar

Primary left ventricular rehabilitation is effective in maintaining two-ventricle physiology in the borderline left heart

ObjectiveBorderline left heart disease is characterized by left heart obstructive lesions (coarctation, aortic and mitral stenoses, left ventricular hypoplasia) and endocardial fibroelastosis. The multilevel obstruction and impaired left ventricular systolic and diastolic function contribute to failure of biventricular circulation. We studied the effects of left ventricular rehabilitation—endocardial fibroelastosis resection with mitral or aortic valvuloplasty—on left ventricular function and clinical outcomes.MethodsAll patients with borderline left heart structures and endocardial fibroelastosis who underwent a primary left ventricular rehabilitation procedure were retrospectively analyzed to determine operative mortality, reintervention rates, and hemodynamic status. Left heart dimensions and hemodynamics were recorded from preoperative and postoperative echocardiogram and cardiac catheterization. Postoperative left atrial pressure was obtained from the intracardiac line early after left ventricular rehabilitation. Preoperative and postoperative values were compared by paired t test.ResultsBetween 1999 and 2008, 9 patients with endocardial fibroelastosis and borderline left heart disease underwent left ventricular rehabilitation at a median age of 5.6 months (range, 1–38 months). There was no operative mortality, and at a median follow-up of 25 months (6 months to 10 years) there was 1 death from noncardiac causes and 2 patients required reoperations. Significant increases in ejection fraction and left ventricular end-diastolic volume were observed, whereas left atrial pressure and right ventricular/left ventricular pressure ratios decreased postoperatively.ConclusionIn patients with borderline left hearts, primary left ventricular rehabilitation with endocardial fibroelastosis resection and mitral and aortic valvuloplasty results in improved left ventricular systolic and diastolic performance and decreased right ventricular pressures. This approach may provide an alternative to single-ventricle management in this difficult patient group

CuO Elaboration and Studies of the Influence of Heat Treatment on the Structural Properties

In the present work we synthesize nano powders of CuO by precipitation method, using CuCl2 as precursor. The obtained powder has undergone a heat treatment annealing 100°C, and 450°C. Structural analysis by X-Ray diffraction, Fourier transform infrared (FTIR) microscopy and scanning electron microscopy (SEM) reveal that CuO nano particles are in nano graphs forms and with improved crystallization at 450°C, annealing temperature as monoclinic crystal lattice structure. The radius of NCs calculated by the Scherrer formula is 12.31 nm

A multidimensional program including standing exercises, health education, and telephone support to reduce sedentary behavior in frail older adults:Randomized clinical trial

Objectives: The primary aim of this study was to evaluate the effect of a multidimensional program including home-based standing exercises, health education, and telephone support for the reduction of sedentary behavior in community-dwelling frail older adults. The secondary aim of this study was to evaluate the safety and adherence of the program. Study design: A single-blind, randomized controlled trial. Methods: A total of 43 frail older adults were randomly assigned to the intervention and control groups. The intervention consisted of combined strategies including home-based standing exercises, health education, and telephone support for 16 weeks for frail older adults. The control group received orientation regarding the harmful effects of a sedentary lifestyle. Sedentary behavior was evaluated by total sedentary time, accumulated sedentary time in bouts of at least 10 min, and by the break in sedentary time, measured by an accelerometer used for at least 600 min/day for 4 days. Safety was assessed by self-reporting of possible adverse events. Adherence was assessed based on the number of days in which standing exercises were performed by the participants. Repeated measures ANOVA and Tukeys post hoc test were used to analyze the collected data. Results: The intervention group reduced the sedentary time by 30 min/day (p= 0.048), but without significant maintenance after 30 days of the program. Of the total number of participants, 82% (n = 14) of the intervention group participants showed more than 70% adherence to the program. The main adverse effects faced by the intervention group participants were tiredness (53%; n = 9) and lower limb pain (47%; n = 8). Conclusions: The multidimensional program reduced sedentary behavior, was safe, and showed satisfactory adherence in frail older adults