Judul: Kajian Aktivitas Hambat Pertumbuhan Bakteri  Patogen Oleh Serbuk Bakteriosin Yang  Dihasilkan Bakteri Asam Laktat Galur Scg 1223
Abstrak: The preservative agent is usually add into a product to improve its characteristic. The research on natural preservatives also has been using to reduce the contamination of pathogenic bacteria. The important of preservatives agent is its stability. The stability of inhibition activity of bacteriocins would maintain the ability in reducing the growth of pathogenic bacteria. In the production of food additive is use full to control the water content of bacteriocins and maintained its viability. Bacteriocins produced by Lactic Acid Bacteria strain SCG 1223 was stable at low pH (2-4), 100oC and storage condition of 4oC for 120 days. The best encapsulation formula for bacteriocins was by using 83,33% maltodextrine, 16,67% skim milk, and 20% of liquid bacteriocins SCG 1223. The condition for encapsulation was good if using lower temperature inlet of 150oC and temperature outlet of 75-80 oC. The yield obtained was 69,3% having 2,73% moisture content and 66,81% soluble solids. The low moisture content and high soluble solids showed to increase the inhibition activity.
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Judul: Produksi Bakteriosin dari Bakteri Asam Laktat Galur SCG 1223 dalam Media Molasses
Abstrak: Bacteriocins are proteinaceous (generally peptide) which can inhibit the growth bactery pathogen that similar or closely related bacterial strain with the cell producer of bacteriocins. Efficiency and effectivitiy of bacteriocins production can be obtained by optimizing production factors. Bacteriocins given much benefit for industrial food, because bacteriocins can reduced the contaminant microorganism causing food spoiled and food borne illness diseas. Usually media for bacteriocins production is MRS Broth (de Mann Rogosa Sharpe). But MRS broth is expensive for industrial scale production. Because of that, we need to find alternative media which is cheaper but effective for growth medium. Molasses is one of ingredient that usually to use as medium growth of microorganism. To optimized the growth of lactic acid bacteria (LAB), molasses media can be added by yeast extract, peptone, and tween 80. This research obtain to know ability bacteriocins from LAB SCG 1223 which growth in molasses medium and get formula medium based on melasses media that is efficient to produce bacteriocins and effective to inhibit the bacterial pathogen. Indicator bacterial was needed to know the ability of bacteriocins to inhibit the growth bactery pathogen. The more bactery pathogen species which can inhibit by bactericins more wide the spectrum inhibit activity. The inhibit activity of bacteriocins was known by the transparent zone around the colony. According to the result of this research, formula media M4K1P2 which consist of molasses 4%, yeast extract 1%, peptone 2%, and tween 80 1% is effective to inhibit pathogen bacterial. The formula M4K1P2 has inhibit activity 1004.80 AU.ml against E. Coli, 2047.59 AU/ml against L. Monocytogenes, and 529.80 AU/ml against S. Thypimurium. Inhibit activity is an ability for one molecul bacteiocin to inhibit single cell pathogen microorganism which we can assume from the wide of the clear zone.
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology