Search results for "SAMPLE"

A New Sampling Method for Spleen Stiffness Measurement Based on Quantitative Acoustic Radiation Force Impulse Elastography for Noninvasive Assessment…

2014

In our study, we evaluated the feasibility of a new sampling method for splenic stiffness (SS) measurement by Quantitative Acoustic Radiation Force Impulse Elastography (Virtual Touch Tissue Quantification (VTTQ)).We measured SS in 54 patients with HCV-related cirrhosis of whom 28 with esophageal varices (EV), 27 with Chronic Hepatitis C (CHC) F1–F3, and 63 healthy controls. VTTQ-SS was significantly higher among cirrhotic patients with EV (3.37 m/s) in comparison with controls (2.19 m/s,P<0.001), CHC patients (2.37 m/s,P<0.001), and cirrhotic patients without EV (2.7 m/s,P<0.001). Moreover, VTTQ-SS was significantly higher among cirrhotic patients without EV in comparison with bot…

The application of molecular imprinting technology to solid phase extraction

2001

In parallel to a long lasting search for universal multi-purpose sorbents, the area of solid phase extraction (SPE) is recently experiencing a rapid development of new types of tailor-made class specific or compound-specific sorbents which are designed to respond to the increasing demand for selectivity and efficiency in sample clean-up prior to quantification. An important issue here is the enrichment and clean-up of complex samples, such as environmental waters, sediments, biofluids and foodstuffs prior to detection. This because the analyte is often present in low concentration in a complex mixture of similar compounds and therefore needs to be isolated and enriched in order to be detect…

Teacher–child relationships and social competence: A two-year longitudinal study of Chinese preschoolers

2012

Abstract Based on a two-year and three-wave longitudinal sample of 118 Chinese preschoolers, the present study examined the cross-lagged associations between teacher–child relationships and social competence, and the cross-system generalization of social competence between home and school. At each of the three waves, teachers rated the children's teacher–child relationships and social competence in school, and mothers rated the children's social competence at home. The results showed that high closeness and low conflict in teacher–child relationships at three months after preschool entry (T1) predicted children's social competence in school at the end of the first preschool year (T2). T1 te…

How does job insecurity relate to self-reported job performance? Analysing curvilinear associations in a longitudinal sample

2013

The study focuses on the relationship between job insecurity and self-reported job performance. Based on theoretical, empirical, and statistical arguments, we propose that this relationship is U-shaped and mediated by vigour at work. This assumption was tested cross-sectionally and across two measurement points, and against two alternative explanations, namely that the U-shaped relationship might be due to the influence of the moderators optimism and supervisory support. The findings of a study among a large group of job-insecure employees of two Finish universities ( n = 2,095) confirm the U-shaped effect of job insecurity on self-reported job performance. This effect was shown to be robus…

Effects of work–family culture on employee well-being: Exploring moderator effects in a longitudinal sample

2010

This present panel study had three aims: (1) to shed new light on the work–family culture (WFC)–well-being (work–family conflict, work engagement, job exhaustion) linkage by investigating lagged associations between the phenomena; (2) to consider the multidimensional nature of WFC by specifying whether its lagged effects on well-being would vary by its dimensions; and (3) to explore whether the positive aspects of WFC would prevent its negative ones from spilling over into employee well-being. The study was based on a 2-year longitudinal sample (N = 409) gathered among Finnish health care workers. The results showed that WFC was a bidimensional construct containing both negative (work–famil…

Funcionamiento ejecutivo y rendimiento matemático: un estudio longitudinal

2016

El objetivo del presente estudio longitudinal consistió en examinar el poder predictivo de las funciones ejecutivas de inhibición y memoria de trabajo (MT) evaluadas en Educación Infantil (T1) sobre los aspectos formales e informales del rendimiento matemático en 2º de Educación Primaria (T2). La muestra inicial estuvo conformada por 209 preescolares de 5 a 6 años, de los que un 86.12 % de los sujetos volvieron a ser evaluados en el T2 (7-8 años). En el T1, se administraron seis tareas neuropsicológicas relacionadas con las funciones ejecutivas de inhibición y MT verbal y visoespacial. En el T2, se aplicó la batería TEMA-3 (Gingsburg y Baroody, 2003) para evaluar diferentes aspectos relacio…

Contributions of Motivation, Early Numeracy Skills, and Executive Functioning to Mathematical Performance. A Longitudinal Study

2018

The main goal of this longitudinal study is to examine the power of different variables and its dynamic interactions in predicting mathematical performance. The model proposed in this study includes indicators of motivational constructs (learning motivation and attributions), executive functioning (inhibition and working memory), and early numeracy skills (logical operations, counting, and magnitude comparison abilities), assessed during kindergarten, and mathematical performance in the second year of Primary Education. The sample consisted of 180 subjects assessed in two moments (5–6 and 7–8 years old). The results showed an indirect effect of initial motivation on later mathematical perfo…

The power of empowering team leadership over time: A multi-wave longitudinal study in nuclear power plants

2021

Abstract Team attitudes in critical infrastructures are essential to achieving reliable operations despite internal and external challenges, and empowering team leadership (ETL) may be an important precursor of these attitudes. The present study aimed to test whether ETL was related to teams’ satisfaction trajectories, measured as changes in job satisfaction and safety satisfaction at three time points. Hypotheses were tested in a sample of 48 teams from two Spanish nuclear facilities in three different waves (2008, 2011, and 2014). Growth Modeling using hierarchical linear models with SPSS 20.0 revealed that ETL was positively related to initial levels of teams’ job and safety satisfaction…

School grades as predictors of self-esteem and changes in internalizing problems: A longitudinal study from fourth through seventh grade

2020

This longitudinal study of 562 students (from ages 10 to 13) investigated whether developmental changes in internalizing problems (emotional and peer problems) can be predicted by school grades in mathematics and language arts and whether these predictive relations are mediated by students' self-esteem. The data comprised of teacher-rated internalizing problems, grades in math and language arts, and student self-ratings of self-esteem. The latent change score modeling indicated that math grades positively predicted self-esteem. Furthermore, lower self-esteem was related to an increase in internalizing and emotional problems in the total sample, and to an increase in peer problems in boys. T…

2020

Nasal continuous positive airway pressure (NCPAP) devices using variable (vf-) and continuous (cf-) flow or synchronized nasal intermittent positive pressure ventilation (s-NIPPV) are used to prevent or treat intermittent hypoxia (IH) in preterm infants. Results concerning which is most effective vary. We aimed to investigate the effect of s-NIPPV and vf-NCPAP compared to cf-NCPAP on the rate of IH episodes. Preterm infants with a gestational age of 24.9–29.7 weeks presenting with IH while being treated with cf-NCPAP were monitored for eight hours, then randomized to eight hours of treatment with vf-NCPAP or s-NIPPV. Data from 16 infants were analyzed. Due to an unexpectedly low sample size…