The Effect of the Type of Planting Media and The Addition of O2 Nanobubbles on the Growth of Dendrobium burana Green × Ong Ang Ai Boon Orchid Plantlets in Vitro

Dendrobium orchids come in a variety of colors, shapes, and beauty that are in great demand. The process of growing orchids requires special handling of an appropriate growing environment, such as proper planting media and nutrients that can stimulate orchid growth. This type of thin liquid film media is the use of liquid media with an immersion system while vermiculite and perlite media have almost the same properties. However, vermiculite has a higher water absorption capacity than perlite. Nanobubbles are bubbles with 1-100 nm that can live more stably in water. This study aims to influence the type of media and the addition of Nanobubbles O2 on the growth of Dendrobium burana Green × Ong Ang Ai Boon orchid plantlets. This research was carried out from November to December 2022 at the PT. Java Indo Arjuna Singosari, Malang. This study used a completely randomized design (CRD) with 10 treatments, namely solid MS, gaviota solid, thin liquid film, thin liquid film + NBs O2, vermiculite, vermiculite + NBs O2, perlite, perlite + NBs O2, vermiculite + Perlite, vermiculite + perlite + NBs O2 with 4 replications. The data were analyzed descriptively and the Manova test. The results showed that the vermiculite + NBs O2 treatment had the potential to increase the length of plantlets by 13.80 mm, the wet weight of plantlets by 0.30 g, the percentage of live plantlets by 100% whereas in the vermiculite + perlite treatment has the potential for the first root growth to appear, namely 5 HST. The vermiculite treatment had the potential to increase the highest number of leaves by 5 leaves, whereas in the leaf color treatment the solid MS treatment had a more intense green color

The Application of Cows Rumen for Electricity Generation Through The Implementation of A Ceramic-Based Microbial Fuel Cell System

The growth in population is not adequately matched by the corresponding increase in energy demand. The imperative for prioritizing the exploration of alternative energy sources that possess attributes of safety, affordability, and ample access to raw materials cannot be overstated. An energy source with significant potential is a microbial fuel cell (MFC)-based energy source. This study aims to investigate the utilization of cow rumen as a substrate and source of nutrition in the bioenergy system of microbial fuel cells (MFCs). The present study aims to investigate the impact of substrate concentration and bacterial incubation duration derived from bovine rumen bacteria on the attainment of optimal power density. The research employed a Dual Chamber Microbial Fuel Cell (MFC) device using a Proton Exchange Membrane (PEM) constructed from ceramic materials. Daily observations were conducted over a period of 30 days. The performance of MFC was assessed utilizing the polarization technique. The findings indicated that altering the proportion of bovine rumen bacterial substrates and the duration of bacterial incubation had an impact on the power density seen in the Microbial Fuel Cell (MFC) system. The optimal conditions were attained when the substrate concentration reached 3640 ppm and after 7 days, resulting in a maximum power density of 864 mW/m2

Conversion of LDPE Plastic Oil to Gasoline by Supercritical Water Liquefaction

LDPE (Low Density Polyethylene) is one of the plastic waste that is often found in the surrounding environment. Based on data from the National Waste Management Information System (SIPSN) in 2022, waste in Indonesia reached 17.834.071 tons/year with 18.5% being plastic waste. Plastic waste management generally uses recycling. However, recycling plastic waste is not efficient enough in tackling plastic waste in Indonesia. Recently, a promising alternative recycling method for the future is pyrolysis, a process to convert plastic into fuel oil. However, the pyrolyzed oil still contains impurities that reduce the quality of the oil. As an effort to improve the quality of pyrolysis oil, the author proposes the addition of zeolite catalyst in the pyrolysis process followed by the Supercritical Water Liquefaction (SWL) method. The zeolite catalyst aids the degradation process thereby accelerating the reaction rate. The SWL method is able to convert plastic waste into low molecular weight chemicals. The results obtained will be analyzed by gas chromatography mass spectroscopy (GC-MS) to determine the length of the carbon chain in the sample. Based on the chromatography data, it is found that the number of peaks and retention times show carbon chains ranging from C8-C12, from these results it can be identified that the sample is included in kerosene or kerosene compounds. After the SWL process, the percentage of kerosene and diesel is reduced to 11% gasoline. So the Supercritical Water Liquefaction process is proven to break down long hydrocarbon chains into lighter ones

Antibacterial Test of Kedondong Hutan Leaf (Spondias pinnata) Against Salmonella typhi

Kedondong hutan (Spondias pinnata) is a plant belonging to the Anacardiaceae family, plant that grows a lot in the Sulawesi area, one of which is in the Poso area, Central Sulawesi. The surrounding community uses this plant as a traditional food preparation which is often called the "Arogo Onco" by the community. Kedondong hutan contains active compounds that have the potential as antibacterial, namely flavonoids, saponins and tannins. The purpose of this study was to determine the potential of forest kedondong leaves in inhibiting the growth of Salmonella typhi bacteria. The extraction process was done the decoctation method using aquadest and while the antibacterial test was done using the diffusion method against three bacterial strains namely Salmonella typhi BPE 127.1 MC, BPE 122.4 CCA and NCTC 786. The results showed that the leaf extract of kedondong hutan (Spondias pinnata) contained flavonoids, saponins and tannins with the results of the analysis of total flavonoids 1514,9 mgQE/g, saponins 0.613% and tannins 8,94 mgTA/g. The results of the antibacterial test showed the greatest inhibitory power at a concentration of 100%. Salmonella typhi BPE 127.1 MC, BPE 122.4 CCA, NCTC 786, was the inhibition zone 17.67±0.58 mm, 15.67±0.58 mm and 20.33±0.58 mm were included in the category of strong inhibition zone

Utilization of Tofu Liquid Waste with Ceramic-Based Microbial Fuel Cell (MFC) Technology

The application of ceramic-based Microbial Fuel Cells (MFCs) for the treatment of tofu liquid waste presents a promising and environmentally sustainable approach. The purpose of this study was to determine the effect of adding variations in substrate concentration and to determine the effect of variations in the surface area of the electrode (anode and cathode), resulting in a maximum power density value for a period of 13 days of measurement. The initial step is measuring the voltage and current with the substrate concentration without a dilution process, then the concentration variations are carried out by dilution 10 times, 8 times, 5 times, 4 times, and 2 times on ceramics with a diameter of 8 cm. The second step is measuring the voltage and current by varying the surface area of the electrodes (cathode and anode). The results of the measurements obtained that the maximum power density value obtained was 188.23 mW/m2 without a dilution process, namely with a concentration of 3640 ppm for the third day. Meanwhile, the results of the measurement of the variation of the electrode surface area obtained a maximum power density value of 205.88 mW/m2 on the electrode surface area of 3.57 m2 for the third day. The more surface area of the electrode given at the time of measurement, the more bacteria contact the electrode, causing the resulting power density value to be even greater

Variations of Coconut Shell, Rice Husk, and Bagasse as an Alternative of Briquettes Materials

The current energy condition is getting thinner meanwhile people's daily lives still use a lot of energy derived from fossil fuels so that its use is increasing with limited availability. An alternative to reduce the use of fossil energy is by utilizing waste biomass as an energy source one of them is briquetts. This study aims to analyze the characteristics of briquettes from a variety of briquette mixtures made from coconut shells, rice husks, and bagasse. The method used is survey and experimental. The survey of sampling coconut shells was carried out in the Seberang Ulu I area, rice husks in the Pegayut area, and bagasse was obtained at the ice cane traders in the Seberang Ulu I area. The data obtained were presented in graphical form and analyzed descriptively. The results obtained are the water content in the variation of the combination of briquette-making materials ranging from 4.23 - 5.13%, ash content of 7.6 - 7.86%, the density value obtained is 0.55 - 0.59 g/cm3, the compressive strength value is 25.67 - 37.33 kg/cm2, and the calorific value is 4756 - 4865 cal/gr. The results showed there is not significant differences in moisture content, ash content, and compressive strength, while the density and calorific value showed significant differences

Potential of Ecoenzymes and N2 Nanobubbles on the Growth of Phalaenopsis sp. Orchid at the Acclimatization Stage

Growth is a quantitative change during one plant’s life cycle and is irreversible.withaddition An in crease the volume or dry weight of plants or other organs is due to the adding, of new structural elements. Phalaenopsis (moth orchid) is a genus of orchids appeal. The diversity of colors, shapes, and textures, as well as its aroma, make Phalaenopsis orchids one of the charming flowers of Indonesia. Ecoenzyme is a solution of complex organic substances produced from the fermentation of organic residues, sugar, and water. Nanobubbles (NBs) are an example of nanotechnology. NBs have a diameter of 1-100 nm and are nanoscopic gas bubbles in a solution or water that can change the characteristics of water and are stable. This study aims to determine the potential of giving Ecoenzyme and NBs N2 on the growth of Phalaenopsis orchids during the acclimatization stage. This research was conducted from October to December 2022 at the Orchidology and Nursery Laboratory, Islamic University of Malang. This study used an experimental method with a completely randomized design (CRD) with 10 treatments, namely 0 mL/L (control), 1 mL/L Ecoenzyme, 2 mL/L Ecoenzyme, 3 mL/L Ecoenzyme, 4 mL/L Ecoenzyme, 4 combination NBs N2 and Ecoenzymes, and 5 mL NBs N2 with 3 replications, making a total of 30 treatment units. The research parameters included the number of leaves, leaf length, number of roots, root length, plant height, fresh weight, and plant dry weight. The results of this study showed that the treatment of 3 mL/L Ecoenzyme showed potential in increasing the number of leaves by 4 pieces: at the same time the optimal concentration of the combination of Ecoenzyme and NBs was 2 mL/L plus 5 mL NBs N2 in increasing the number of roots by 10 pieces, and the optimal concentration of NBs was 5 mL in increasing the root length by 7.07 cm, plant height by 17.10 cm leaf. length, plant weight by 4.16 g and dry weight by 0.85 g in Phalaenopsis orchids

In Silico Analysis of Active Compounds from Allium tuberosum as Drug Candidate for Inhibitor DENV-3 Envelope Protein

Dengue fever has become a global health issue, the development of dengue vaccine has not yet been established. Medicinal plants are an ideal alternative for DENV infection drugs. The purpose of this study was to determine in silico the potential of active compounds from Allium tuberosum as envelope protein inhibitors of DENV-3. The method of this research is to do docking analysis of compounds with DENV-3 envelope protein and analysis of amino acid residues using MVD, pharmacokinetic analysis using SwissADME, toxicity analysis using ProTox-II. The best docking value for the potential activity to inhibit the receptor DENV-3 is the thymidine compound (RS: -81.1245 kcal/mol). The highest activity of thymidine is the most promising as a drug candidate, as evidenced by the toxicity analysis which is predicted to have non-carcinogenic, non-mutagenic, inactive properties against hepatotoxicity, cytotoxicity and immunotoxicity parameters, as well as pharmacokinetic analysis that fulfills 6 parameters of lipopolicity, molecular weight, polarity. , insolubility, insaturation, and flexibility which indicate the drug candidate of thymidine is safe for its bioavailability. The conclusion from the results of this study is that one compound has the ability as an antiviral, binding score with DENV-3 is good, and is safe in terms of pharmacokinetics and toxicity, namely thymidine compound

Analysis of Propeller Selection for Unmanned Aircraft

Unmanned aircraft are usually used to perform missions, for example surveillance missions. This mission is not always carried out in a suitable location. Researchers must ensure that the aircraft can take off properly. For this reason, runway distance greatly affects the performance of the aircraft. The aircraft can fail to take off due to the lack of thrust generated by the propeller. The propeller diameter size of each unmanned aircraft can differ from one another and this difference in propeller diameter causes a difference in thrust force. Therefore, it is very important to determine the right propeller diameter to be used on an unmanned aircraft that is adjusted to the runway distance. This propeller selection analysis is carried out using experimental methods, which is tool testing and simulation with Propeller Power Calculator software. The results of this study can be seen that a propeller with a larger diameter will produce a greater thrust force. The size of the diameter and pitch and the number of blades of a propeller can also affect the amount of thrust generated. This will be a consideration for choosing a propeller to be used on an unmanned aircraft. So that the selected propeller can be used optimally by reviewing the amount of thrust that is influenced by the amount of diameter