Search results for "Light"
showing 10 items of 3575 documents
Ocular Clocks: Adapting Mechanisms for Eye Functions and Health
2018
Vision is a highly rhythmic function adapted to the extensive changes in light intensity occurring over the 24-hour day. This adaptation relies on rhythms in cellular and molecular processes, which are orchestrated by a network of circadian clocks located within the retina and in the eye, synchronized to the day/night cycle and which, together, fine-tune detection and processing of light information over the 24-hour period and ensure retinal homeostasis. Systematic or high throughput studies revealed a series of genes rhythmically expressed in the retina, pointing at specific functions or pathways under circadian control. Conversely, knockout studies demonstrated that the circadian clock re…
Oxidation-Induced Increase In Photoreactivity of Bovine Retinal Lipid Extract
2017
Open access original paper Source : 10th EPR Workshop on Applications of EPR in Biology and Medicine, 2016 in Krakow, POLAND.; International audience; The mammalian retina contains a high level of polyunsaturated fatty acids, including docosahexaenoic acid (22:6) (DHA), which are highly susceptible to oxidation. It has been shown that one of the products of DHA oxidation-carboxyethylpyrrole (CEP), generated in situ, causes modifications of retinal proteins and induces inflammation response in the outer retina. These contributing factors may play a role in the development of age-related macular degeneration (AMD). It is also possible that some of the lipid oxidation products are photoreactiv…
Assessment of Muscular Fitness as a Predictor of Flight Duty Limitation.
2018
Introduction The high acceleration (Gz) exposure among military pilots flying fighter aircraft has been associated with an increased risk for cervical and lumbar disorders. It has been suggested that an adequate level of physical performance could reduce the risk of experiencing these disorders. The Finnish Air Force has for several years used aerobic (bicycle ergometer) and muscular fitness tests (battery of five tests) in the selection process of military pilot candidates in order to evaluate their physical fitness level. The aim of the study was to determine if these selection phase tests and anthropometry measures can predispose those individuals who might be at risk of developing sever…
Investigation on the Possibility of Designing an Educational Dynamic Light Scattering Device for Sizing Particles Suspended in Air
2019
Abstract If a light beam meets a fluid that contains scattering centers randomly distributed in suspension, light is scattered by each of them. If the light source is coherent, the scattered waves will be also coherent, therefore they will interfere. The fluctuations of the far-field interference signal, once recorded and digitized, become a time series that can be later on analyzed to produce the average size of the suspended particles or the size distribution. The technique wears the name of Dynamic Light Scattering. We present the results of our investigation on the possibility of using an educational model, made of low-cost, conventional electronics, for recording the time signal of lig…
Swift light sheet volumetric charting of large human brain portions
2020
Using a custom light sheet fluorescence microscope, we image large stained human brain portions, labelled for NeuN and GAD67 neuronal markers, discerning the inhibitory population via neural-network based image analysis and exposing the brain connectivity.
Galerías de «mujeres ilustres» o el sinuoso camino de la excepción a la norma cotidiana (ss. XV-XVIII).
2000
Between the fifteenth and the eighteenth centuries, collections of «illustrious women» were a very widely spread genre all over Europe. Humanistic and courtly in their origins, they were linked to the discourse of women´s «excellence» and they transmitted the values of privilege and aristocratic ethics. At the same time, they showed ambivalent, disturbing and powerful images of «women on top». The fact that its popularity seems to have increased during the eighteenth century and that they took more widespread forms such as articles in the periodicals raises interesting questions about the meanings those images, opposed in many ways to Enlightenment values and attitudes, could have for eight…
Personality correlates of gaslighting behaviours in young adults
2021
This study focused on gaslighting, a specific type of psychological violence occurring in intimate relationships, where one partner displays controlling behaviours towards the other. The aim of the research was to analyse the association between gaslighting behaviours and dysfunctional personality domains of both abusers and survivors, respectively assessed through the PID-5-IRF and the PID-5-BF. A group of 250 young adults (males=124), aged 18–30 years (M=22.99, SD= 3.02), took part in this study. Our results showed that (a) for abusers, detachment, disinhibition and psychoticism were positively associated with gaslighting behaviours, and (b) for survivors, antagonism, disinhibition and ps…
‘Each flight is different’ : Carbon emissions of selected flights in three geographical markets
2017
Abstract Air travel is considered the biggest individual climate sin. Avoiding flying, however, seems impossible. In this paper we argue that the flight a passenger chooses can be significant. For this purpose we compared the carbon emissions of selected flights in three geographical markets. We found tremendous differences in the environmental performance of individual flights. Furthermore, we also found that flying with the most modern aircraft or flying non-stop represents, in many cases, the least polluting option. Nevertheless, we were able to show that there are exceptions to this rule. Based on our results, we provide recommendations to the industry and for further research.
Competition for long-haul connecting traffic among airports in Europe and the Middle East
2017
Abstract This paper analyzes the competitive position of major hub airports in Europe and the Middle East for long-haul connecting traffic. We apply a connection builder to construct competitive flight connections. A stand out feature of the proposed connection builder is the calibration of the model parameters using booking data, composed of actual passenger demand between a given origin and destination (O&D) market. The methodology is applied to measure competition between hubs using flight schedule data to calculate connectivity measures like the number of city-pairs connected via a hub airport. Our results show that the Middle Eastern hubs have improved their competitive position, while…
How the Better Reason Wins
2020
Abstract This paper considers Mendelssohn’s attempt at a definition of Enlightenment in terms of Bildung, comprising the theoretical element of the enlightenment of reason with the practical requirements of culture. To avoid a possible dialectics of enlightenment, where the very methods one uses to enlighten harbour the seeds of new blindness, Mendelssohn advocates considering the lively connections between people, the role of traditions and personal relations in the formation of an individual self, and the connections we should have to our past, present, and future. Thus, his essay from 1784 can be read as an apt defence of a dialogical notion of freedom within the Enlightenment era.