scholarly journals Ionic Species Affect the Self-Propulsion of Urease-Powered Micromotors

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xavier Arqué ◽  
Xavier Andrés ◽  
Rafael Mestre ◽  
Bernard Ciraulo ◽  
Jaime Ortega Arroyo ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Ionic Species ◽  
The Self ◽  
Digital Holographic Microscopy ◽  
Future Application ◽  
Methoxypolyethylene Glycol ◽  
Negative Effect ◽  
The Media ◽  
Holographic Microscopy

Enzyme-powered motors self-propel through the catalysis of in situ bioavailable fuels, which makes them excellent candidates for biomedical applications. However, fundamental issues like their motion in biological fluids and the understanding of the propulsion mechanism are critical aspects to be tackled before a future application in biomedicine. Herein, we investigated the physicochemical effects of ionic species on the self-propulsion of urease-powered micromotors. Results showed that the presence of PBS, NaOH, NaCl, and HEPES reduced self-propulsion of urease-powered micromotors pointing towards ion-dependent mechanisms of motion. We studied the 3D motion of urease micromotors using digital holographic microscopy to rule out any motor-surface interaction as the cause of motion decay when salts are present in the media. In order to protect and minimize the negative effect of ionic species on micromotors’ performance, we coated the motors with methoxypolyethylene glycol amine (mPEG) showing higher speed compared to noncoated motors at intermediate ionic concentrations. These results provide new insights into the mechanism of urease-powered micromotors, study the effect of ionic media, and contribute with potential solutions to mitigate the reduction of mobility of enzyme-powered micromotors.

Effect of Advertising on Youth

2016 ◽  
Vol 10 (2) ◽  
Author(s):  
Shruti Sarin ◽  
Aastha Sharma ◽  
Dhruv Pant
Keyword(s):  
Young Adults ◽  
21St Century ◽  
Food Habits ◽  
Vital Role ◽  
The Self ◽  
Self Concept ◽  
Growing Up ◽  
Way Of Life ◽  
Negative Effect ◽  
The Media

Television has the potential to generate both positive and negative effect on youth. Due to the powerful impact as mostly the advertisements is done with celebrities this is the main reason youth easily believe. Today’s youth are more sensitive and far more sophisticated than were 20 years ago. Youth is treated as the special audience. The effect of advertising on youth can be seen through their changes in their personality, food habits, and attitudes. In 21st century the youth is getting much more conscious regarding their style, fashion and looks. Advertisements play a vital role in persuading them and encouraging them to buy more fashion oriented products. Throughout history, the media has used stereotypes to convey a false perception to society of a certain group, race or religion. By displaying such negative and confining images in advertisements, adverts are limiting the self-concept of young impressionable adults. By growing up around such images, young adults are taught that the ideas are presented are the “set” way of life, and are swayed to believe that these false perceptions are reality. Teens are given impractible, unattainable goal to love up to which is presented to them. For e.g. Actors wearing Lacoste clothing in advertisements, teenagers act in different ways and try to copy the actor or actresses. This research tries to understand the perception of youth, their changing habits and their frame of mind in regard to the advertisements.

scholarly journals In situ nanoscale observations of gypsum dissolution by digital holographic microscopy

2017 ◽  
Vol 460 ◽  
pp. 25-36 ◽  
Author(s):  
Pan Feng ◽  
Alexander S. Brand ◽  
Lei Chen ◽  
Jeffrey W. Bullard
Keyword(s):  
Digital Holographic Microscopy ◽  
Gypsum Dissolution ◽  
Holographic Microscopy

Cartesian Fingerprints in Beckett's Imagination Dead Imagine

2012 ◽  
Vol 21 (2) ◽  
pp. 223-243
Author(s):  
Irit Degani-Raz
Keyword(s):  
The Self ◽  
Levels Of Abstraction ◽  
The Media ◽  
The Mind ◽  
Limiting Case

The idea that Beckett investigates in his works the limits of the media he uses has been widely discussed. In this article I examine the fiction Imagination Dead Imagine as a limiting case in Beckett's exploration of limits at large and the limits of the media he uses in particular. Imagination Dead Imagine is shown to be the self-reflexive act of an artist who imaginatively explores the limits of that ultimate medium – the artist's imagination itself. My central aim is to show that various types of structural homologies (at several levels of abstraction) can be discerned between this poetic exploration of the limits of imagination and Cartesian thought. The homologies indicated here transcend what might be termed as ‘Cartesian typical topics’ (such as the mind-body dualism, the cogito, rationalism versus empiricism, etc.). The most important homologies that are indicated here are those existing between the role of imagination in Descartes' thought - an issue that until only a few decades ago was quite neglected, even by Cartesian scholars - and Beckett's perception of imagination. I suggest the use of these homologies as a tool for tracing possible sources of inspiration for Beckett's Imagination Dead Imagine.

scholarly journals Furloughs, Teleworking and Other Work Situations during the COVID-19 Lockdown: Impact on Mental Well-Being

2021 ◽  
Vol 18 (6) ◽  
pp. 2898
Author(s):  
Israel Escudero-Castillo ◽  
Fco. Javier Mato-Díaz ◽  
Ana Rodriguez-Alvarez
Keyword(s):  
Mental Health ◽  
Ad Hoc ◽  
Well Being ◽  
The Self ◽  
Exogenous Shock ◽  
Work Location ◽  
Negative Effect ◽  
Market Status ◽  
Mental Well Being ◽  
Labour Market Status

As a consequence of the Spring 2020 lockdown that occurred in Spain due to the COVID-19 pandemic, many people lost their jobs or had to be furloughed. The objective of this study is to analyse the influence of the latter changes in labour market status on psychological well-being. For this purpose, an ad-hoc questionnaire featuring socio-demographic and mental health criteria was created. Granted that the pandemic can be viewed as an exogenous shock, the bias caused by the bidirectional problems between the work situation and mental well-being can be tackled. Results indicate that the lockdown exerted a greater negative effect on the self-perceived well-being of unemployed and furloughed persons than on those in employment. Moreover, among those in continuous employment, teleworkers experienced a lesser degree of self-perceived well-being post lockdown as compared to those people remaining in the same work location throughout the COVID-19 crisis. Finally, the lockdown provoked worse effects on the self-perceived well-being of women as compared to men, a result that appears to be related to gender differences in household production. In conclusion, these results could be especially relevant given that the evolution of the pandemic is having ongoing effects on employment and, therefore, on the mental health of workers.

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