This work presents the results of the continuity of the research process carried out in the Energy Studies Center belonging to the Faculty of Technical Sciences of the University of Matanzas, which involves the establishment of a dimensionless model to determine the average condensation heat transfer coefficient of Air Coleed Condenser (ACC) systems in straight and inclined tubes. The research consists in obtaining in an analytical way the solution of the differential equation of the velocity profile, considering that condensation is of pellicular type, finally the empirical condition of Roshenow is combined with the theoretical solution to generate a numerical expression that allows obtaining with a 15.2% of deviation in 2,192 tests, a value of the average coefficient of heat transfer by condensation very similar to the one obtained with the use of the most referenced model in the consulted literature, the empirical model of Chato.

According to the World Health Organization (WHO), breast cancer is among the most common cancers worldwide. Most of the anticancer agents have been showing a variety of side effects. Recently, bacterial proteins have been investigated as promising anticancer agents. Azurin is a bacterial cupredoxin protein secreted from Pseudomonas aeruginosa and has been reported as a potent multi-targeting anticancer agent, which makes it an appropriate candidate for drug delivery. Azurin may be delivered to cancer cells using different carriers like polymeric micro and nanoparticles. In the present study, azurin was extracted from the bacterial host and loaded into chitosan particles. Then its effect on MCF-7 cell line was investigated. Chitosan-azurin particles were made using the ion gelation method. Results showed that chitosan-azurin particles are about 200 nm, and the loading of the protein in particles did not affect its integrity. The MTT assay showed a significant reduction in cell viability in azurin and chitosan-azurin-treated cells. The toxicity level after 5 days was 63.78% and 82.53% for free azurin and chitosan-azurin-treated cells, respectively. It seems using an appropriate carrier system for anticancer proteins like azurin is a promising tool for developing low side effect anticancer agents.

This work shows the results of the biosynthesis of silver nanoparticles using the microalga Chlorella sp, using growth media with different concentrations of glycerol, between 5%–20%, and different light and temperature conditions. The synthesis of nanoparticles was studied using supernatants and pellets from autotrophic, heterotrophic and mixotrophic cultures of the microalga. The presence of nanoparticles was verified by ultraviolet-visible spectroscopy and the samples showing the highest concentration of nanoparticles were characterized by scanning electron microscopy. The mixotrophic growth conditions favored the excretion of exopolymers that enhanced the reduction of silver and thus the formation of nanoparticles. The nanoparticles obtained presented predominantly ellipsoidal shape with dimensions of 108 nm × 156 nm and 87 nm × 123 nm for the reductions carried out with the supernatants of the mixotrophic cultures with 5% and 10% glycerol, respectively.

Since an outbreak of COVID-19 in the late 2019 in Wuhan in China, the pandemic and contagious nature of coronavirus did not spare Nigeria as the most populous Africa nation from being affected. Statistical records have shown that a large number of citizens were affected and overwhelming literature has explored different dimensions of the impacts of COVID-19 in the country. However, there is a less attention in exploring legal, economic, health and ethical impacts of the pandemic on Nigerian children. The paper primarily aims at filling this gap in the existing body of knowledge. Systematic literature review (SLR) and content analysis of secondary data of online peer-reviewed, scholarly articles among others were used as methodology. The findings revealed that, the general economic impact of COVID-19 that affects trade and small & medium scale business activities of parents also directly or indirectly affected their children. The health consequence of COVID-19 affects provision of nutritious foods that would help their balanced diet and growth. It is further noted that the ethical impact of COVID-19 affects their right to education as a result of lockdown during the first phase of the out-break. It is however reiterated that, there has not been adequate legal framework to address the multifarious im-pacts of COVID-19 on the Nigerian children. In conclusion, this paper has novel contribution specifically showing concern for children during the period of COVID-19 pandemic in the country. It is therefore suggested that efforts should be galvanized by the stakeholders in addressing multifarious challenges of the impact of COVID-19 on the Nigerian children as explored in this study.