2021, Biology, Sweden / 20.07.2021

This study investigates the antibacterial effect of silver ions on Escherichia Coli and Bacillus Subtilis. It aims to clarify the correlation between the silver ion concentration and the antibacterial effect. The well diffusion method was used in the experiment, where five different concentrations of silver ions were examined (0, 1, 5, 20 and 50 mM). Every concentration was tested 12...

2021, Physics, Sweden / 20.07.2021

How airplanes fly is one of the most important questions within the field of air- and spacecraft development. By studying how paper airplanes behave, one can develop knowledge on flight principles. The purpose of this scientific report was to gain a better understanding of how the design of a paper airplane affected the longest possible flight distance. The studies show...

2021, Biology, Israel / 20.07.2021

Although categorizing stimuli is a basic cognitive ability, the neural mechanisms of categorization and category learning are poorly understood. Here, we conducted a proof of concept experiment and were able to show that mice can learn categorization of auditory stimuli. This allows us to use mice as an animal model for future categorization studies. We further investigated connections in the...

2021, Mathematics, Ukraine / 20.07.2021

Seymour’s Second Neighborhood Conjecture states that every simple digraph without loops or two-cycles contains a vertex whose second neighborhood is at least as large as its first. In this project we show that from existence of a counterexample to Second Neighborhood Conjecture it follows that there exist strongly-connected counterexamples with both low and high density (dense and sparse graph). We...

2021, Physics, Ukraine / 20.07.2021

Optical inhomogeneity plays an essential role in the observation of various objects. For example, it underlies phenomena such as astronomical refraction and mirages occurrence. It is also used in optical devices: for instance, in the Luneburg lens, which is used in the radar reflector and microwave antenna. The research aim is to construct and examine the trajectory of light in...

2021, Computing, Turkey / 20.07.2021

To improve the life expectancy and quality of a patient, early diagnosis, medical attention and accurate analysis are required. In this work, we propose a highly scalable system, with a focus on generalizability to other domains, that is capable of end-to-end cranial surgery planning, being the first study to define the surgery planning operation as an optimization problem and solving...

2021, Mathematics, Turkey / 20.07.2021

This project is analyzed in three parts. In the first part, Covid-19 and winter diseases that show similar symptoms are distinguished by using fuzzy soft set matrices. In the second part, while calculating the Covid-19 follow-up treatment priority, a risk score algorithm is created with the help of six criteria: age, hypertension, cardiovascular disease, cancer, chronic kidney failure and diabetes....

2021, Chemistry, Turkey / 20.07.2021

Environmental pollutants carried by water and air are one of the most important problems that destroy resources today. Herein, a proof-of-concept of a new colorimetric-fluorescent environmental-medical sensor is demonstrated by testing two hypotheses: (1) by combining artificial receptors with microfluidics, sensors based on color changes for acrolein and formaldehyde molecules can be developed, and (2) using microfluidics designed with carbon...

2021, Chemistry, Tunisia / 20.07.2021

The wastewater containing Methylene Blue (MB), released by textile factories after dying Jean clothes, is significant pollution in the environment. We propose a photocatalytic protocol for MB treatment, as semiconductor photocatalysis uses sunlight to decompose organic pollutants (MB). We have used, for this, CZTS nanoparticles synthesized by the solvothermal method. The protocol shows that about 88% of MB was decreased...

2021, Materials, Tunisia / 20.07.2021

World consumption of paper has grown 400% in the last 40 years. Now nearly 35% of the total trees cut around the world are used in paper industries, which is a disaster for nature. As wood contains 40-50% of cellulose, and sunflower seeds' shell contain 48% of this material as well, which is the main component of paper making, we...