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The Covid-19 pandemic, which is happening all over the world, needs serious attention. Covid-19 initiated by an RNA type virus can cause more severe problems later on due to its ability to mutate. Integrated molecular research is required to determine the characteristics and potential of various variants of Covid-19 in mutations. This study was conducted by directing phylogenetic analysis on 17 samples of Covid-19 sequences from several countries taken from the NCBI database and followed by ORF analysis of each Covid-19 sample for further characterization. Based on the study, it is known that from 17 samples of Covid-19 sequences, Covid-19 sequences from Taiwan have the lowest similarity compared to 16 other Covid-19 sequences. These results are confirmed by the ORF analysis of each sample, which shows that the longest ORF in the Covid-19 sequence from Taiwan is an ORF 20 with lengthened by 4405 amino acids, and the shortest ORF is an ORF 38 with lengthened by 50 amino acids. However, 16 other sequence samples have the longest ORF 6, ORF 6, with lengthened by 4405 amino acids and the shortest ORF 44 with lengthened by 50 amino acids. The difference in ORF variation affects the similarity level of Covid-19 sequences from several countries. It is due to variations in ORF that produce amino acid variations that determine the Covid-19 phenotype. [ABSTRACT FROM AUTHOR]

Gout and COVID-19 have been of global concerns. One of the drugs for gout is allopurinol that acts as a xanthin oxidase inhibitor (XOI). However, this drug has side effects, so we need safer drugs from herbal sources such as sugar apple. Sugar apple ethanol extract can act as XOI, but the activity of steeping with hot water is not known. Besides, several sugar apple compounds are also reported to be active as anti-viruses, but their activity has not been categorized against the COVID-19. This study aimed at making powder from sugar apple, which was brew using hot water, determined the phytochemical content, including TPC and TFC, tested its activity as XOI and the profile bond of the active compounds to the S protein of COVID-19. The results showed that the extract of sugar apple powder contained alkaloids, flavonoids, polyphenols, with TPC and TFC levels of 0.048% and 0.099%, active as XOI. Furthermore, the in silico analysis has shown three compounds in sugar apple, namely quercetin-3-glucoside, rutin, and kaempferol-3-rutinoside that can bound to the RBD of S protein of COVID-19, so it is predicted that the three compounds have anti-COVID-19 activity. [ABSTRACT FROM AUTHOR]

In this paper, we considered a mathematical model of the spread of the Coronavirus disease 2019 (COVID-19). The model was based on the COVID-19 outbreak in Wuhan, China. The model was of the type of the SEIR (Susceptible, Exposed, Infected, Removed) system involving the effects of individual reaction and governmental action. We used Euler's and Heun's numerical methods for solving the model. We took parameters of the Wuhan case for simulations of the COVID- 19 spread. Both Euler's and Heun's methods produced solutions having the same behavior. These solutions provided a prediction of the spread of COVID-19 in a particular region. [ABSTRACT FROM AUTHOR]

Diabetes Mellitus (DM) and COVID-19 diseases are still global problems. One of the causes of DM, mainly type 2 is unhealthy eating habits, including white sugar, which contains almost no active compounds except sucrose. The active compounds in sugarcane juice such as ferulic acid, gallic acid, 4-Hydroxy benzoate acid, and vanillic acid, which are suspected besides alpha-amylase inhibitors, also have potential as anti COVID-19. The purpose of this research is to extract secondary metabolites from sugarcane juice, determine TPC and TFC, and to know in silico activity of the active compounds in sugarcane juice as an alpha-amylase inhibitor and binding position to the active site of the spike protein. The results have shown that TPC and TFC in sugarcane juice are 0.5501% and 0.4480%. The in silico analysis has proven that the ferulic acid compound is bonded to the alpha-amylase binding site as acarbose did. Gallic acid, 4-hydroxy benzoic acid, and vanillic acid compounds are bonded to RBD of S protein COVID-19 as chloroquine did, with various binding affinity. These results indicate that phenolic and flavonoids in sugarcane juice have the potential as an alpha-amylase inhibitor and anti COVID-19. [ABSTRACT FROM AUTHOR]