Judul: Characterization of Antibacterial Properties in Peptide  Filtrate from Commercial Dadih Collected at Varied bamboo
Abstrak: Dadih adalah produk fermentasi susu tradisional yang berasal dari Sumatera Barat, dibuat dari susu kerbau melalui fermentasi alami dalam bambu. Dadih ber potensi menghasilkan peptida bioaktif, salah satunya peptida antibakteri. Penelitian ini bertujuan untuk karakterisasi sifat antibakteri dari filtrat peptida yang didapat dari dadih komersial dengan ukuran bambu berbeda. Metode yang dilakukan yaitu, filtrasi peptida dengan cutoff 3 kDa, pengukuran pH, total asam teritrasi, kadar protein (Lowry), dan pengujian antibakteri dengan Staphylococcus aureus, Bacillus cereus, Escherichia coli, dan Salmonella typii. Hasil penelitian menunjukkan ukuran bambu berbeda tidak memiliki pengaruh yata (P>0,05) terhadap kadar protein, pH, dan total asam pada dadih. Ukuran bambu berbeda tidak berpengaruh nyata (P>0,05) terhadap daya hambat antibakteri dadih pada bakteri Gram positif. Namun, memiliki pengaruh nyata (P<0,05) terhadap daya hambat antibakteri dadih pada bakteri Gram negatif yaitu E. coli dan S. typii. Hal ini menunjukkan aktivitas antibakteri dadih lebih berpengaruh terhadap bakteri Gram negatif karena produksi senyawa-senyawa antibakteri yang berbeda pada setiap bambu.
Keyword: dadih, antibakteri, bambu, filtrat peptida

Judul: Physical Properties and Protein Profiling of Commercial Traditional Dadih Produced from Different Bamboos.
Abstrak: Susu kerbau digunakan sebagai bahan baku dan difermentasi secara tradisional dalam bambu. Penelitian ini meneliti karakteristik fisik dan profil protein dadih komersial yang diproduksi dengan bambu berukuran berbeda di Sumatera Barat. Data yang diamati meliputi pH, viskositas, kadar protein, dan SDSPAGE, yang dianalisis dengan One-Way ANOVA. Hasil penelitian menunjukkan bahwa pH dan viskositas dadih tidak berbeda signifikan (P>0,05) antara bambu kecil dan bambu besar. Namun, kadar protein menunjukkan perbedaan signifikan (P<0,05). Profil protein dadih dari tabung besar menunjukkan berat molekul antara 8,14 kDa - 22,30 kDa, sedangkan dari tabung kecil berkisar antara 9,29 kDa - 57,22 kDa. SDS-PAGE mengungkapkan lima pita protein dalam dadih tabung kecil, termasuk BSA, a-kasein, ß-laktoglobulin, dan a-laktalbumin, dengan satu pita tidak teridentifikasi. BSA dan ß-laktoglobulin tidak ditemukan dalam dadih tabung besar, menunjukkan laju proteolitik yang lebih ekstrim dalam tabung besar dibandingkan tabung kecil., Buffalo milk is used as the raw material and is traditionally fermented in bamboo. This study examines the physical characteristics and protein profiles of commercial dadih produced using different sizes of bamboo in West Sumatra. The observed data include pH, viscosity, protein content, and SDS-PAGE, analyzed using One-Way ANOVA. The results of the study show that the pH and viscosity of the dadih did not differ significantly (P>0.05) between small and large bamboo. However, the protein content showed a significant difference (P<0.05). The protein profile of dadih from large bamboo tubes showed molecular weights ranging from 8.14 kDa to 22.30 kDa, while in small bamboo tubes, the molecular weights ranged from 9.29 kDa to 57.22 kDa. SDS-PAGE revealed five protein bands in dadih from small bamboo tubes, including BSA, a-casein, ß-lactoglobulin, and a-lactalbumin, with one band unidentified. BSA and ß-lactoglobulin were not found in dadih from large bamboo tubes, indicating a more extreme proteolytic rate in large tubes compared to small tubes.
Keyword: olahan susu, dadih, protein

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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