Judul: Karakteristik Beras Tiruan dengan Penambahan Rumput Laut dan Agar-Agar
Abstrak: Rumput laut jenis Gracilaria sp. penghasil agar-agar yang kaya akan serat dan tanin dapat dijadikan suatu alternatif diversifikasi pangan seperti beras tiruan. Tujuan penelitian ini yaitu mengetahui pengaruh penambahan tepung rumput laut dan agar-agar dari Gracilaria sp. terhadap karakteristik komposisi kimia dan sensori beras tiruan. Penelitian ini menggunakan rancangan acak lengkap (RAL) faktorial dua faktor dengan uji lanjut Duncan, dan Kruskal Wallis. Hasil penelitian menunjukkan bahwa penambahan tepung rumput laut dan agar-agar memberikan pengaruh terhadap komposisi kimia dan kesukaan panelis pada parameter warna, bau, dan tekstur beras tiruan yang dihasilkan. Beras tiruan yang dihasilkan memiliki kadar air berkisar 9,9-13,7%, kadar abu 1,1-4,3%, lemak 0,3-3,7%, protein 2,7-5,9%, karbohidrat 77,7-80,3%, dan serat 0,11-0,95%. Beras tiruan dengan penambahan tepung rumput laut 10% merupakan beras terbaik dan paling disukai berdasarkan nilai sensori dengan kandungan tanin sebesar 0,11-0,2%
Keyword: beras tiruan, rumput laut, serat pangan, tanin

Judul: Characteristics of Artificial Rice with the Addition of Seaweed Gracilaria sp.
Abstrak: Rumput laut Gracilaria sp. mengandung serat pangan dan senyawa polifenol yang dapat dimanfaatkan dalam produk diversifikasi pangan beras tiruan. Beras tiruan adalah produk olahan sumber karbohidrat non padi yang memiliki kandungan karbohidrat mendekati beras yang terbuat dari tepung lokal atau tepung beras. Beras tiruan dengan penambahan rumput laut memiliki potensi sebagai bahan pangan pengganti beras untuk sumber karbohidrat yang tinggi serat. Penelitian ini bertujuan menentukan formulasi dan karakteristik beras tiruan dengan penambahan rumput laut Gracilaria sp. dengan metode ekstrusi serta menentukan formulasi terbaik beras tiruan. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan faktor konsentrasi rumput laut Gracilaria sp. 0%, 5%, 10% dan 15%. Beras tiruan formula terpilih berdasarkan metode Bayes adalah beras tiruan dengan penambahan rumput laut Gracilaria sp. 10%. Kriteria penilaian penting beras tiruan meliputi parameter sensori dan komposisi kimia. Beras tiruan yang dihasilkan memiliki nilai sensori yang disukai panelis dengan nilai kadar air 7,29% sesuai batas yang ditentukan SNI 6128:2008, senyawa total fenol 253,94 mg/kg, komponen tanin 0,27% serta kandungan serat pangan sebesar 13,85% yang termasuk beras tiruan dengan tinggi serat sehingga telah mencukupi asupan serat pangan harian., Gracilaria sp. contains dietary fiber and polyphenolic compounds that can be used in artificial rice diversification products. Artificial rice is a non-rice carbohydrate source processed product that has a carbohydrate content close to that of rice made from local flour or rice flour. Artificial rice with the addition of seaweed has the potential as a food substitute for rice for a high-fiber carbohydrate source. This study aims to determine the formulation and characteristics of artificial rice with the addition of seaweed Gracilaria sp. with the extrusion method and determined the best formulation of artificial rice. This study used a Completely Randomized Design (CRD) with the concentration factor of seaweed Gracilaria sp. 0%, 5%, 10%, and 15%. Artificial rice selected formula based on Bayes method was artificial rice with the addition of seaweed Gracilaria sp. 10%. Important assessment criteria for artificial rice include sensory parameters and chemical composition. The artificial rice produced had a sensory value that preferred by the panelists, the water content of 7,29% according to the limits set by SNI 6128:2008, total phenol compound 253,94 mg/kg, 0,27% tannin component, and has a food fiber content of artificial rice of 13,85 % food fiber content which includes artificial rice with high fiber so that it has enough daily dietary fiber intake.
Keyword: artificial rice, dietary fiber, Gracilaria sp., polyphenol

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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