scholarly journals The Dark Side of Detracking: Mixed-Ability Classrooms Hurt Low-Achievers’ Math Motivation

2021 ◽  
Author(s):  
Moritz Fleischmann ◽  
Nicolas Hübner ◽  
Benjamin Nagengast ◽  
Ulrich Trautwein

We tested how detracking school reforms, which abolish ability grouping and introduce mixed-ability classrooms, affect students’ math motivation. To do so, we made use of data from two unique natural experiments (N Study 1 = 78,376, N Study 2 = 2,257) and compared student cohorts before and after detracking. In both studies, we found low achievers’ math motivation to be substantially lower after the reform, whereas this was not the case for high achievers. Our study reminds researchers and policymakers that detracking school reforms can have unintended side effects on student motivation. Only when such negative side effects are reduced or eliminated, detracking school reforms can unfold their full potential in establishing educational equality.

2020 ◽  
Vol 27 (4) ◽  
pp. 495-510
Author(s):  
Frederik Rosén

AbstractThis article introduces the concept of the dark side of cultural heritage protection. It points out how the many and mostly honorable efforts to protect cultural heritage against the harms of war and conflict sometimes contribute to make cultural heritage vulnerable or even to cause its destruction. The more we talk about cultural heritage and its value and the importance of protecting it, the more interesting it becomes for some groups to target it. This article argues that states, international organizations, and the heritage community need to recognize these negative side effects and make sure to consider them in future action.


2021 ◽  
Vol 22 (4) ◽  
pp. 1710
Author(s):  
Sylwia Cyboran-Mikołajczyk ◽  
Przemysław Sareło ◽  
Robert Pasławski ◽  
Urszula Pasławska ◽  
Magdalena Przybyło ◽  
...  

Liposomal technologies are used in order to improve the effectiveness of current therapies or to reduce their negative side effects. However, the liposome–erythrocyte interaction during the intravenous administration of liposomal drug formulations may result in changes within the red blood cells (RBCs). In this study, it was shown that phosphatidylcholine-composed liposomal formulations of Photolon, used as a drug model, significantly influences the transmembrane potential, stiffness, as well as the shape of RBCs. These changes caused decreasing the number of stomatocytes and irregular shapes proportion within the cells exposed to liposomes. Thus, the reduction of anisocytosis was observed. Therefore, some nanodrugs in phosphatidylcholine liposomal formulation may have a beneficial effect on the survival time of erythrocytes.


2021 ◽  
Vol 10 (7) ◽  
pp. 1388
Author(s):  
Marta Malesza ◽  
Erich Wittmann

The main aim of this study was to investigate the various factors influencing COVID-19 vaccination acceptance and actual intake among older Germans aged over 75 years old (n = 1037). We found that the intention to get vaccinated or intake of the COVID-19 vaccine were positively related to the perceptions of becoming infected, perceptions of the severity of the potential long-term effects, the vaccine’s efficacy, and the benefits of vaccination. Meanwhile, the intention to get the vaccine or vaccine intake were decreased by perceptions of the negative side-effects and the general impediments to vaccination.


2021 ◽  
pp. 2046147X2110140
Author(s):  
Roumen Dimitrov

In this paper I analyse a series of Australian MMR (measles-mumpsrubella) vaccination campaigns and policies from the last decade. Using the Bruno Latour’s Actor Network Theory (ATN), I locate human and non-human mediators – including the virus and vaccine – in the complex pro-vaccination alliance led by government campaigners. I identify the vaccine hesitant parents – a large group that ‘sits on the fence’ between the ‘vaccine confident’ and ‘vaccine refusing’ parents – as the main target of pro-vaccination campaigns. PR literature on pro-vaccination campaigns has applied ATN to the independence of the media as network agents. This paper contributes with the problematisation of several more actors such as the health workers, medical experts and the vaccine hesitant parents themselves. Even when they are keen members of a pro-vaccination network, they cannot be taken for granted. This is where understanding of stigma, silence and voice helps. To align their group interests and discourses, government should know how to communicate strategically – including how to communicate indirectly, avoiding stigma and keeping certain internal affinities and communicative distances intact. In conclusion, I make suggestions about strategic communication in pro-vaccination campaigns. Communication of statistical risks and side effects should be central. It is a winning strategy because it establishes a more credible balance between individual rights and collective obligations in achieving herd immunity. And mandating vaccination cannot replace communication. Research shows that legislating compulsory vaccination may have short-term and relatively small effects. They are almost negligible in the long run. Mandate may trigger compliance, but it also causes anger and mistrust. Mandating vaccine has negative side effects. It punishes with economic and cultural sanctions the socially disadvantaged, who are not active refusers. It also has the opposite effect on vaccine hesitant parents. It does not weaken but rather strengthens their resistance to the vaccine and pushes them to the lager of antivaxxers.


1974 ◽  
Vol 38 (3) ◽  
pp. 987-999
Author(s):  
Vernon R. Putz

Four training conditions were investigated with human Ss differentiated according to high achievement and low achievement academic histories. Trainer's presence or absence was paired with conditions of trial and error and prompting in a complete factorial. It was hypothesized based on a Hull-Spence interpretation of social facilitation that trainer's presence with prompting during training would lead to superior transfer over conditions of trainer's absence and prompting, while the lowest transfer was expected with the combined condition of trainer's presence and trial and error. It was further assumed that high achievers would learn the task readily and be relatively unaffected by the four training conditions. On the transfer task for both fault-misses and response time trial and error for the low achievers was superior to prompting. Trainer's presence was insignificant, while achievement level was influential. The results suggested that active learning involving the task-activity of trial and error was more arousing than the social factor of the trainer's presence, particularly in view of the fact that the trainer lacked significant evaluative ability for the trainee- Ss in the laboratory setting.


2022 ◽  
Author(s):  
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2021 ◽  
Author(s):  
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Author(s):  
Jasmina Cilerdzic ◽  
Mirjana Stajic ◽  
Jelena Vukojevic

Even though numerous lichen species possess significant medical potentials they are still unexplored, and particularly species and strains originating from Serbia. Therefore, the aim of this study was to evaluate the antioxidative and antimicrobial potential of ethanol extracts of Parmelia saxatilis and Pseudoevernia furfuracea collected in Serbia. The tested extracts were good scavengers of DPPH radicals, with capacities ranging from 14.76% to 79.76% in P. saxatilis and from 21.39% to 90.04% in P. furfuracea. In P. saxatilis level of DPPH? neutralisation was highly correlated with phenol content (r2 = 0.9981) and in P. furfuracea with amount of total flavonoides (r2 = 0.9641). The extract of P. furfuracea inhibited the growth of all tested microorganisms with exception of Aspergillus flavus, while P. saxatilis extract affected only growth of bacterial species. Among tested microorganisms, Staphylococcus aureus and Klebsiella pneumoniae were the most sensitive, while Enterococcus faecalis, Pseudomonas aeruginosa as well as micromycetes were the least sensitive to tested extracts. Because of these potentials and the fact that their long term usage does not have any negative side effects on organism and development of microbial resistance, the extracts could be included in conventional therapy.


2021 ◽  
Vol 22 (17) ◽  
pp. 9396
Author(s):  
Chloë Maes ◽  
Jeroen Meersmans ◽  
Laurence Lins ◽  
Sandrine Bouquillon ◽  
Marie-Laure Fauconnier

In recent years, the development of new bio-based products for biocontrol has been gaining importance as it contributes to reducing the use of synthetic herbicides in agriculture. Conventional herbicides (i.e., the ones with synthetic molecules) can lead to adverse effects such as human diseases (cancers, neurodegenerative diseases, reproductive perturbations, etc.) but also to disturbing the environment because of their drift in the air, transport throughout aquatic systems and persistence across different environments. The use of natural molecules seems to be a very good alternative for maintaining productive agriculture but without the negative side effects of synthetic herbicides. In this context, essential oils and their components are increasingly studied in order to produce several categories of biopesticides thanks to their well-known biocidal activities. However, these molecules can also be potentially hazardous to humans and the environment. This article reviews the state of the literature and regulations with regard to the potential risks related to the use of essential oils as bioherbicides in agricultural and horticultural applications.


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