Judul: Kualitas mikrobiologi keju: keberadaan staphylococcus aureus pada tahap pembuatan keju gouda
Abstrak: Milk and its derivative products could potentially transmit pathogenic microorganisms from animals to human. Staphylococcus aureus is one of the microorganisms that commonly presents in milk and dairy products. This bacteria is often associated with foodborne disease outbreaks due to the ability of some strains to produce thermostable enterotoxins. The aim of this study was to analyze the presence of S. aureus during the Gouda cheese manufacturing process. Samples were obtained from every stages of Gouda cheese production. Staphylococcus aureus analysis was performed using pour plate method in Vogel Johnson agar. The number of S. aureus in raw milk was 2.4 x 103 CFU/ml (exceeding the maximum level for contaminant specified by BSN in SNI No. 3141.1-2011). The number of this bacteria increased in the following stages. The highest level was reached in young Gouda cheese (3.6 x 106 CFU/g). This level significantly increased from ripened cheese to become young Gouda cheese and remained stable during the ripening process. The high level of S. aureus in Gouda cheese (exceeding the maximum level for contaminant specified by BSN in SNI No. 7388-2009) indicates it could be potentially cause foodborne disease.
Keyword: foodborne disease, Gouda cheese, milk, Staphylococcus aureus

Judul: Kualitas Mikrobiologik pada Keju Gouda
Abstrak: The aim of this study was to observe the total number of microorganism and coliforms in Gouda cheese. Samples were taken every week for three consecutive weeks. As many as 10 samples of each Gouda cheese (Gouda young, middle, and old) were examinated using plate count method (pour plate method). The data was analyzed with t-student and Duncan test to compare the total number of microorganism and coliforms. The result showed that Gouda old cheese has the highest average number of total microorganism (1.4x108 cfu/gram). There was not any significant difference in the total number of microorganism between Gouda young cheese and Gouda middle cheese. The significant (p<0.05) difference in the total number of microorganism was showed with Gouda young cheese and Gouda old cheese; Gouda middle cheese and Gouda old cheese. The highest average number of coliform was found in Gouda young cheese (4.3x105 cfu/gram). There was not any significant difference in the total number of coliforms among all the three types of Gouda cheese (p>0.05). The presence of coliforms in Gouda cheese indicated any contamination during the process and reduced the quality.
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Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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