This study presents a system to electro-neutralize agrochemicals in food and water samples based on the properties of a controlled electron trap, the related apparatus is protected under patent application (WD/2018/090110; ONPO: BR 10 2016 0268486) / (PCT / BR 2017/050115). The efficacy of the system was verified as to the type, quantity, surface tension charge, temperature, pH and static energy loading of the electrolyte for both solid and liquid samples. Ot also took into consideration the retention and accumulation measurement of electric charges, verification of electrical potential differences and also accumulation by applying pulsed high voltage in according to the Daniell Cell method. The proposed technology is able to provide the electron-neutralization of acidic and alkaline chemicals and their toxic byproducts by modifying the pH of the liquid or solid medium. This is justified by the action of the electron trap using different polarities and electrodes in the range of 8 to 100 kV.
The main objective of this work was to study the synthesis and characteristics of two-dimensional heterostructures (2D/2D) using pure molybdenum disulfide (MoS[Formula: see text] and doped with phosphorus at 5% and 15% combined with graphene oxide (GO) and graphene monolayer. These were deposited on silicon and copper substrates using two different deposition methods: Microdrop casting and chemical vapor deposition. Chemical and structural information of the samples were characterized by Raman spectroscopy, Energy Dispersion X-ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM) and Kelvin Probe Force Microscopy (KPFM). The results prove the synergy between the materials resulting in electronic coupling, making this system potential for applications in electronic devices such as sensors, resistors and capacitors.
A discussão sobre agrotóxicos afeta fortemente a sociedade, já que seu uso apresenta importantes argumentos a favor e contra seu uso. Além de sua importância social e sanitária, essa discussão toca diretamente o campo do direito, uma vez que os argumentos científicos sobre o uso de agrotóxicos devem servir de lastro para que se elaborem leis que regulamentem seu uso ou não uso. Para discutir essas questões, optamos por utilizar a metodologia de um ensaio teórico, que tem por objetivo dialogar com o leitor, sem a pretensão de chegar a conclusões, mas sim de fomentar a reflexão crítica sobre o tema.
A COVID-19 pandemic has erupted around the world. World Health Organization (WHO) and allies are racing to create and deploy safe and effective vaccines as they work together to monitor the pandemic, advise on crucial measures, and distribute essential medical resources to those in need. Vaccines save millions of lives, by training the body's natural defenses, the immune system, to identify and combat the viruses and bacteria they are intended to combat. This review article presents the status of COVID-19 vaccines evaluated by the WHO Emergency Use Listing (EUL) assessment process and those liberated as well. Data was obtained from the WHO, Gavi – The Vaccine Alliance from Bill & Melinda Gates Foundation, Oxford Vaccine Group, Serum Institute of India, AstraZeneca, European Medicines Agency EMA among others. As can be seen, there is still no totally effective vaccine, and many clinical trials are still needed, and even immunized citizens are still at risk of recontagion. Virus mutation is a recurring problem and different vaccine production methodologies are still being studied.
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