Judul: Degradasi in vitro asam fitat rumput dan legum oleh konsorsium bakteri rumen pencerna serat asal kerbau
Abstrak: Phytic acid is the major storage of phosphorus in the seeds of legume and cereal. It is degraded by ruminal bacteria. However the ability of bacteria isolates in degrading nutrients and phytic acid is not clear. The objective of this study was to evaluate the ability of sellulolytic bacteria consortium isolated from rumen buffalo to degrade phytic acid and digest dry matter, as well as organic matter. The first trial evaluated the ability of sellulolytic bacteria consortiom in degrading phytic acid. The consortium of 6 rumen bacteria isolates was incubated anaerobically in media containing pollard, legume and grass for 3, 6 and 12 hours. Phytic acid content contained in the media was determined before and after fermentation. Data were analyzed according to simple statistic. The second trial was designed to evaluate the in vitro fermentability of legumes and grasses. The results suggested that phytic acid was partly degraded by the consortium of rumen bacteria. Degradation of phytic acid was influenced by type of plant and fermentation period. There was no correlation between phytic acid degradation and concentration of VFA, NH3, dry matter and organic matter digestibility. It was concluded that consortium of rumen bacteria was capable in degrading phytic acid contained in grasses and concentrates, but its degradation was not affected by the protein degradation and fermentation of carbohyd
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Judul: Degradasi Asam Fitat pada Kambing Peranakan Etawah Laktasi yang Mendapat Ransum Bersuplemen Kedelai Sangrai, Vitamin dan Mineral
Abstrak: Phytic acid is a chelating agent which has been known as an anti nutrition that binds minerals and reduces their biological availability. The purpose of the research was to observe phytic acid degradation and its relation with mineral absorption and dry matter digestibility, and to evaluate the relation of dry matter digestibility determining by total collection method with that of AIA (acid insoluble ash) method. Eight Etawah Grade lactating goats were allocated to two groups and to dietary treatments of suplemented ration. Lactating goats in treatment 1 and treatment 2 groups were offered a complete feed without or with additional roasted soybean, vitamin A, D, E, and mineral cromium (Cr) organic, and selenium (Se). Phytic acid degradation in treatment 1 goats did not differ from that of treatment 2 goats. Roasted soybean, vitamin and mineral supplementation had no effect on phytic acid degradation. Relationship between phytic acid degradation and nutrient digestibility indicated that degradation of phytic acid had positive corelation with dry matter and crude fiber digestibility, but had not significant corelation with neither crude protein nor crude fat digestibility. Phytic acid was highly degraded in ruminant digestive tract (86,32±3,49%). The degradation phytic acid and mineral absorption indicated that phytic acid degradation had no effect on mineral absorption. Total collection methode had no effect corelation with AIA methode.
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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