Biofilm-Forming Heavy Metal Resistance Bacteria From Bungus Ocean Fisheries Port (PPS) West Sumatra as a Waters Bioremediation Agent.

<b>Background and Objective:</b> Heavy metals are one of the most worrisome pollutants due to their toxicity. Prolonged exposure to heavy metals and their accumulation and biomagnification properties adversely affect aquatic biota and human health. The ability of microorganisms to bioremediate heavy metals into non-toxic forms is one solution. The research aims of the study were to find biofilm-forming heavy metal-resistant bacteria isolated from the waters of the Bungus Samudra Fishery Port (PPS), Padang City. <b>Materials and Methods:</b> This study used a marine agar medium modified with the addition of K₂Cr₂O₇, Pb(NO₃)₂ and CdSO₄•H₂O, Marine Broth medium and Congo Red Agar medium. The research methods include, the isolation of bacteria, isolate resistance test to heavy metals, testing the ability of isolates to form biofilms and determine the ability of isolates to reduce heavy metals. Furthermore, molecular identification of bacterial isolates was carried out to determine the type of species. <b>Results:</b> Five heavy metal-resistant bacterial isolates were found that were able to form biofilms, namely isolates B3Cd, B5Cr, B7Pb, B6Pb and B3Pb. The five isolates were able to reduce heavy metal content by 38.67-61.191%. Identification of the best bacterial isolates on each heavy metal tested, namely B3Cd, B5Cr and B7Pb, respectively, showed the type of <i>Acinetobacter schindleri</i>, <i>Acinetobacter</i> sp. and <i>Bacillus</i> sp. <b>Conclusion:</b> These three selected potential isolates can be used as bioremediation agents in metal-polluted waters in the future.

VTE1 and VTE3 Gene Expression During Vitamin E Production in Sunflower (Helianthus annuus L.) Treated with Different Fertilization.

<b>Background and Objective:</b> Sunflower is one of the important commodities in agriculture. The oil content in sunflower seeds has been widely used as cooking oil, but in Indonesia, the utilization of this oil is still relatively low. In addition, sunflowers also contain vitamin E which is useful as an antioxidant, so it can be used to reduce the risk of cardiovascular disease. This study aims to determine gene expression at the RNA level towards vitamin E biosynthesis using different fertilization treatments. <b>Materials and Methods:</b> Sunflowers that had been given different fertilizers were taken in three flowering phases, R3, R5 and R8. Flower samples were isolated until RNA was obtained. The isolation results were tested using real-time PCR to determine the relative gene expression of the <i>VTE1</i> and <i>VTE3</i> genes. After the sunflower seeds were fully ripe, vitamin E content was tested in each treatment and the results were compared with the relative gene expression obtained. <b>Results:</b> The results obtained were fluctuating, but in general, the relative gene expression obtained in the <i>VTE1</i> gene increased in the R3 phase and then decreased in the R5 and R8 phases. Whereas, in the <i>VTE3</i> gene, the relative gene expression obtained experienced an increase in the R3 and R5 phases and then decreased in the R8 phase. The highest vitamin E content was obtained by sample P3 (4218 µg mL¹) and the lowest was obtained by sample P2 (1798 µg mL¹). <b>Conclusion:</b> A balanced ratio of 92:46:30 kg ha¹ of major nutrient fertilizer involving N, P and K could increase vitamin E content in sunflowers. Such a combination exhibited stable expression of the <i>VTE1</i> and <i>VTE3</i> genes in all phases of flowering.

Physicochemical and Morphological Characteristics of Starch and Flour Obtained from Green Banana cv. Raja (Musa paradisiaca cv. Raja) in West Sumatra, Indonesia.

<b>Background and Objective:</b> Banana cv. <i>Raja</i> is widely cultivated in West Sumatra, Indonesia. The physicochemical properties of starch and flour were investigated to determine their functional food prospects in industrial food. <b>Materials and Methods:</b> Starch and flour of banana cv. <i>Raja</i> was characterized using proximate analysis, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Fourier-Transform Infrared (FT-IR), X-Ray Fluorescence (XRF) and Rapid Visco-Analyzer (RVA). <b>Results:</b> Banana cv. <i>Raja</i> starch contains 40.73% starch, 17.49% amylose, 55.5% water, 0.66% ash, 0.83% protein and 0.18% fat. The size of the granules is ranging from 20-30 µm in irregular and ellipsoidal-truncated shapes. The structure of crystallinity belongs to the type B while the gelatinization temperature is 74.9°C. Furthermore, the starch composed of 41.06% potassium, 12.85% phosphorus, 12.74% iron, 9.4% calcium and 7.5% magnesium. <b>Conclusion:</b> The morphological and physicochemical starch characteristics of Banana cv. <i>Raja</i> and has similar characteristics with its flour. Meanwhile the swelling power and the solubility value of the flour were higher than the starch. The gelatinization temperatures of starch and flour were 74.9 and 73.4°C, respectively.

Development of Rapid and Less Hazardous Plant DNA Extraction Protocol using Potassium Phosphate Buffer.

<b>Background and Objective:</b> Protocols commonly used in plant DNA extraction were known to be highly time-consuming and harmful due to the application of some hazardous reagents. Therefore, it was not applicable for such laboratories with limited resources as well as for high-throughput analysis. This study was aimed to develop a rapid yet less hazardous DNA extraction protocol for a plant using potassium phosphate buffer. <b>Materials and Methods:</b> Genomic DNA of chili pepper (<i>Capsicum annuum</i>) was extracted using potassium phosphate buffer and its efficacy was compared to three widely known protocols (CTAB-based, mini preparation and commercial kit). The extracted DNA from those four methods was evaluated based on its quality, quantity, practicality and cost per reaction. <b>Results:</b> Genomic DNA resulted from potassium phosphate buffer-based protocol exhibited comparable quality with adequate concentration for further downstream analysis. Results of PCR and sequencing were also emphasized the amplifiable DNA quality from this developed protocol. Compared to those commonly used protocols, potassium phosphate buffer consisted of 5 main working steps only, thus providing a simple yet rapid plant DNA extraction protocol. Since this protocol used ethanol only, it also offered a less hazardous and low-cost protocol that applicable for those resource-limited laboratories. <b>Conclusion:</b> This developed protocol provided a promising alternative of plant DNA extraction that might be applicable for both large scale analysis and any laboratory type. Further investigation was needed to evaluate its efficacy in extracting genomic DNA from various plants with different morphological characteristic.