Tea tree oil (TTO) merupakan minyak esensial yang berasal dari Melaleuca alternifolia mengandung terpinen-4-ol. TTO memiliki aktivitas sebagai antimikroba. gel bersifat hidrofobik sehingga membutuhkan sistem penghantaran untuk bisa berpenetrasi melewati stratum korneum. Tujuan penelitian ini adalah membuat nanoemulgel TTO, menggunakan Carbopol 940 dan Tween 80 digunakan surfaktan. Optimasi form...

Agro-residues were used as the substrate for the production of fibrinolytic enzyme in solid state fermentation. In this study, two-level full factorial design (25) and response surface methodology were applied to optimize a fermentation medium for the production of fibrinolytic enzyme from the marine isolate Shewanella sp. IND20. The 25 factorial design demonstrated that the physical factors (p...

The present study is focussed on chromium removal by indigenous chromium-resistant microorganisms isolated from soil and sludge samples of an industrial site. optimal bioremediation conditions, namely temperature, hexavalent (Cr(VI)) initial concentration, pH time were determined using a full factorial design at two levels. results showed that the 54 bacterial strains, S10C1 identified as Bacil...

Qualitative analyses were carried out on solid medium with insoluble collagen 0.25% (w/v) to detect proteases with collagenolytic activity produced by Bacillus sp. In cultures incubated for 24 h, a 23 full factorial design with four repetitions at the center point was developed to analyze the effects and interactions between initial pH, temperature and the concentration of gelatin. Based on the...

Wire electro-discharge machining (WEDM) is a fully extended and competitive machining process widely used for hard and difficult to machine materials. In the present research, experimental investigation have been conducted to find out the wire wear rate at different machining parameter Such as peak current, pulse on time, pulse off time, based on full factorial design of experiment. Molybdenum ...

Composite stone is made of crushed materials bound by a polymer resin. A design of experimental techniques was used to evaluate the influence of factors (resin type, use of adhesion promoter, compaction pressure, vibration duration, use of a vacuum, and cure program) on the manufacturing of composite stone. The response variable was flexural strength. A 2IV 6-2 fractional factorial design with ...

In order to improve biosurfactant production by Yarrowia lipolytica IMUFRJ 50682, a factorial design was carried out. A 2(4) full factorial design was used to investigate the effects of nitrogen sources (urea, ammonium sulfate, yeast extract, and peptone) on maximum variation of surface tension (Delta ST) and emulsification index (EI). The best results (67.7% of EI and 20.9 mN m(-1) of Delta ST...