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Antioxidants are thought to help the body fight Reactive Oxygen Species (ROS). Antioxidants are defined as “any substance that significantly slows or inhibits oxidation when present in trace amounts relative to an oxidizable substrate.” Antimicrobials generated from plants have been used to treat infectious diseases for millennia. Many investigations have been done on the antibacterial effects of herbal plant extracts., including roots, stems, leaves, and flowers. Artocarpus altilis is a versatile tree plant that is a rich source of calcium, phosphorus, carbohydrates, minerals, and vitamins. Various parts of breadfruit are used as food, cosmetic medicine, clothing, treating diarrhea, high blood pressure, and asthma. This study obtained about determine biological activities of Artocarpus altilis Leaves. The extract was prepared using water with the soxhletation method. The antibacterial activity was determined with minimun inhibitor concentration method with concentration 300-25 mg/mL can inhibit the growth of Pseudomonas aeruginosa, The MIC is the lowest concentration that may stop bacterial growth, and the number of bacteria is 10 colonies. 60.13 0.54 ppm antioxidant activity, fenol (224.67 mg GAE/g) and flavonoids (27.63 mg QE/g). The results show that Artocarpus altilis leaf ethanol extract is antibacterial and antioxidant.

Free radicals also play a role in the pathology of various degenerative diseases such as cancer, rheumatism, coronary heart disease, cataracts, and others. Free radicals can come from within the body (endogenous) and outside the body (exogenous). Litsea cubeba (Lour,) is a Lauraceae family plant which have contents volatile oils which used as antimicrobial, anticancer on breast cancer, pesticide, antideppressants, antiinflammation, antioxidant, and neuro pharmacology. The extract was prepared using water with the soxhletation method. The antioxidant activity was determined with the 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2’-Azinobis [3-ethylbenzothiazoline-6)-sulfonic acid] -diammonium salt (ABTS) and Ferric Reducing Antioxidant Power (FRAP) methods. Total flavonoid and total phenolic content were determined with colorimetric methods. Antioxidant activity measured as IC50 was 23.37 ± 0.42 µg/mL; 111.21 ± 0.42 and 109.01 ± 0.28 respectively. The extract was found to contain high levels of total phenolic (282.93 ± 0.33 mg GAE/g) and total flavonoid 7.49 ± 0.51 mg QE/g). The results reveal that ethanol extract of Litsea cubeba Lour. Bark has antioxidant potential. The further analysis is to isolation antioxidant compound.

The Remotely Operated Vehicle (ROV) underwater observation equipment has previously been developed, but it had restriction for not being hydrodynamic still due to the unique conditions of the Sunda Strait waters. This study aims to further develop the previously developed ROV by improving the design structure of the ROV body. The method of design concept selection used was concept screening and concept scoring. In concept screening, the initial concept was evaluated relatively to the same preferences using screening matrices. On the other hand the Concept Scoring was conducted by determining the relative performance value which was the assessment used to evaluate how the comparison between concepts and number as the comparison. The result of the study obtained the selected design concept, which was small ROV with streamlined / half-streamlined body geometry which had rear-middle rotor configuration as motion component of hydrodynamic 3 DOF (surge, heave, and yaw).