Mushrooms play an essential role in the ecosystem and have provided humans with numerous benefits in terms of food and medicinal sources. The study was conducted to determine the phytochemical constituents, cytotoxic activity, and proximate analysis of a widespread mushroom in the region, Schizophyllum commune. Qualitative phytochemical analysis and cytotoxic activity of the ethanolic extract were conducted using the test tube method and brine shrimp lethality assay (BSLA). Proximate analysis was carried out using the standards the Association of Analytical Chemists set. Results revealed the presence of saponin, tannins, alkaloids, flavonoids, terpenoids, proteins, and carbohydrates. The linear regression analysis showed that the extracts exhibited a highly cytotoxic activity on brine shrimp with an LC50 value of 55.64 ppm. The cytotoxicity of the extract is mainly attributed to its phytochemical content. Proximate analysis revealed that the sample was composed primarily of moisture with high protein and low-fat content levels. Results support that S. commune is a good protein source and a healthy diet choice. The study may serve for further ethnobotanical, nutritional, and pharmacological studies.

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As a productive ecosystem component, mangroves provide critical services to humankind. Mangroves may be a source of antibacterial compounds that could be used as a natural treatment for managing bacterial infections. This study determined the phytochemical constituents of leaf extracts of three selected mangrove species Avicennia marina (Bungalon), Rhizophora apiculata (Bakhaw), and Sonneratia alba (Pagatpat), using the Test-tube Method and antibacterial sensitivity using an Agar Well-Diffusion Method found in the coastal areas of Talisay City, Negros Occidental, Philippines. The results showed that the three species of mangroves leaf methanolic extracts exhibit susceptibility to antibacterial properties against S. aureus; it was observed that S. alba has the highest inhibitory effect on S. aureus among the three selected mangrove species. There was a significant difference between the positive control (Linezolid 30 mcg) and the methanolic crude extract of R. apiculata (MD = 27.97, p < 0.01), A. marina (MD = 24.37, p < 0.01), and S. alba (MD = 23.09, p < 0.01). On the contrary, A. marina and S. alba did not differ significantly with p= 0.172; this means that the antibacterial activity of methanolic crude extracts of A. marina and S. alba are comparable but significantly differ with the positive control (Linezolid 30 mcg). The qualitative phytochemical analyses of the three species of mangroves' leaf methanolic extracts showed flavonoids, phenols, saponins, and tannins. Terpenoids were present only on R. apiculata.

DNA sequencing is crucial in molecular biology techniques to identify Staphylococcus aureus isolates' genotype to advance diagnoses, prevent, and control infections. DNA isolation can be influenced by several factors which can affect the quality of the output. The experiment was conducted to assess the quality and quantity of genomic DNA isolated from S. aureus. The gDNA's purity and concentration were determined using the spectrophotometric assay, and the quality was analyzed using PCR and agarose gel electrophoresis. The purity of DNA and RNA was determined using the absorbance ratio at A260 and A280, and the percent coefficient of variation was used for the three replicates. The result showed that the extracted gDNA from S. aureus was obtained in large quantities, with good quality, R1=93.67 µg/ml, R2=59.85 µg/ml, and R3=67.50 µg/ml. The concentration was within a 1.8 – 2.0 absorbance ratio and was considered high quantity output. The extracted and amplified pure gDNA fragment from the sample can now be used for other molecular techniques.