Interpersonal violence among youth: A challenge for school personnel

Although interpersonal violence in the school setting is not a new phenomenon, the problem has escalated considerably in this last decade. Both urban and rural school systems are being affected. This paper seeks to explore the extent of interpersonal violence and its impact on students and school personnel. The multiple factors that lead to school violence are examined. Select curricula used in school systems to reduce or prevent violence are highlighted. The article emphasizes that student violence is not a problem limited to the school environment, but one that should and must find a solution through cooperation of all the institutions present in the community, family included. Finally, suggestions are presented for developing preventive strategies.     

Overweight and obesity versus concentrations of VEGF-A,sVEGFR-1, and sVEGFR-2 in plasma of patients with lower limb chronic ischemia

Objective

Being overweight or obese comprises a significant risk factor for atherosclerosis. Fat tissue also generates factors stimulating angiogenesis, the process by which new blood vessels form. The purpose of this paper is to assess concentrations of the vascular endothelial growth factor A (VEGF-A) and its soluble type-1 and type-2 receptors (sVEGFR-1 and sVEGFR-2) in plasma of patients with peripheral arterial disease (PAD) depending on the level of nutrition according to body mass index (BMI).

Methods

The study group included patients suffering from symptomatic PAD (n=46) in Fontaine classes IIa–IV without any history of neoplastic disease and who have a normal BMI (n=15), are overweight (n=21) or are obese (n=10). The control group (n=30) consisted of healthy non-smoking volunteers who were neither overweight nor obese. Venous blood plasma samples were collected from both groups at rest in the morning to determine plasma concentrations of VEGF-A, sVEGFR-1, and sVEGFR-2 using the enzymelinked immunosorbent assay (ELISA) method.

Results

The group of patients with PAD co-existent with being overweight or obese tended to have higher mean concentration levels of VEGF-A and sVEGFR-2 when compared with patients suffering from PAD with normal BMI. A statistically significant positive correlation was obtained between BMI and average plasma concentrations of sVEGFR-2 (R=0.37, P=0.0103). However, no significant correlation was noticed between BMI and VEGF-A or sVEGFR-1 concentrations.

Conclusions

A positive correlation determined between the level of antiangiogenic factor and BMI value may be indicative of the linearly growing prevalence of some antiangiogenic factors in patients with metabolic disorders, which may be one of numerous factors contributing to incomplete efficiency of collateral circulation development in patients with PAD.

     

The role of word recognition,oral reading fluency and listening comprehension in the simple view of reading: a study in an intermediate depth orthography

Empirical research has provided evidence for the simple view of reading across a variety of orthographies, but the role of oral reading fluency in the model is unclear. Moreover, the relative weight of listening comprehension, oral reading fluency and word recognition in reading comprehension seems to vary across orthographies and schooling years. This study aims to examine the direct effects of these three variables on reading comprehension and to test for the existence of indirect effects of word recognition and listening comprehension on reading comprehension via oral reading fluency in European Portuguese, an orthography of intermediate depth. A sample of 264 students was assessed at the end of grades 2 and 4. Structural equation modeling analyses indicated that listening comprehension, word recognition and oral reading fluency predicted reading comprehension in both grade 2 and grade 4. Moreover, the three variables measured in grade 2 predicted later reading comprehension in grade 4. Listening comprehension was always the strongest predictor. Oral reading fluency mediated the relationship between word recognition and reading comprehension, but it was not a mediator variable in the relationship between listening comprehension and reading comprehension. These findings indicate that, similarly to what has been found for other orthographies, the simple view of reading is a valid framework to account for reading comprehension variability in European Portuguese and that interventions to increase reading comprehension levels should focus on word recognition, fluency, and, especially, listening comprehension.     

The moral choices children attribute to adults and to peers: Implications for moral acquisition

Thirty-six children (half 6–8 years old and half 10–12) in Northeast Brazil heard three hypothetical dilemmas featuring a choice between telling the truth and keeping a promise. Each dilemma was initiated by a different kind of lie: an exculpable pro-social lie (teasing), a lie in the personal domain (hiding) and a lie in the service of an anti-social act (cheating). They were asked to choose between truth and promise, and to attribute choices to adults and to peers. More younger than older children chose truth on all three dilemmas. Both regression and SSA analysis showed that “peer-judgments” predicted own judgments on all three dilemmas, but “adult-judgments” did so only on the dilemma, which featured an exculpable lie and involved no adults. The findings may be interpreted as supporting either (a) a constructivist account of development or (b) a learning account that features implicit processes.     

Reconstructing teacher education for disadvantaged communities

Can teacher education be reconstructed to help teachers acquire the knowledge and skills they need to teach disadvantaged populations as proposed by new theories of learning? What shape should this type of teacher education take? After making a case for a transformative teacher education, responsive to current thinking in teaching and learning, I present two instances of school-based approaches to educating teachers that incorporate elements of constructivist, cognitive, and developmental theory when teaching poor rural children. I discuss these cases vis-à-vis their reach and potential for the future of teacher education.     

From planning to mature: On the success of open source projects

Open source is an example of user-centric innovation initiated by an individual or group of users to satisfy their specific needs; the more a software evolves towards a stable release able to address the requirements of its developers, the more successful the project. In this paper we use a large data-set obtained from SourceForge.net to estimate the relationship between a series of different characteristics of OS projects and the probability of evolution of the source code from a preliminary release to a mature version. We show that while projects distributed under highly restrictive licensing terms (GPL) have a significantly smaller probability of reaching a stable release, applications towards sophisticated users have a larger probability of evolving in the development status. Interestingly, we find that the size of the “community of developers” increases the chances of progress but this effect decreases as the community gets larger, a signal of possible coordination problems.     

Vocational training choices of women: public and private colleges

This paper contrasts the profiles of women who choose to pursue vocational training in either public institutions (community colleges) or private institutions (career colleges) in Canada with particular attention given to respondents’ life‐course positions. The study employs 1998 Adult Education and Training Survey data. Correspondence analysis shows the relation between training choices of women, their individual characteristics and selected situational, dispositional, and institutional factors. The space topography determined by the correspondence between training choices and women profiles indicates that duration of training constitutes the primary institutional feature distinguishing choice. Older women who need to balance both work and family obligations tend to enroll in single courses and are attracted to the modular programming of the private colleges. In contrast, the traditional program‐based vocational training offered by community colleges is the preferred option for younger women.     

The Ghost in the Touchscreen: Social Scaffolds Promote Learning by Toddlers

This study examined the effect of a “ghost” demonstration on toddlers’ imitation. In the ghost condition, virtual pieces moved to make a fish or boat puzzle. Fifty‐two 2.5‐ and 3‐year‐olds were tested on a touchscreen (no transfer) or with 3D pieces (transfer); children tested with 3D pieces scored above a no demonstration baseline, but children tested on the touchscreen did not. Practice on the touchscreen (n = 23) by 2.5‐ and 3‐year‐olds prior to the ghost demonstration did not improve performance. Finally, children who learned the puzzle task via a social demonstration and were tested on the touchscreen (n = 26) performed better than the ghost conditions. Taken together, these studies demonstrate that social demonstrations enhance learning from novel touchscreen tools during early childhood.