Judul: Mikroenkapsulasi Pepton Ikan Hasil Tangkapan Sampingan (HTS) Multispesies Busuk dengan Kombinasi Bahan Penyalut
Abstrak: Penelitian ini bertujuan membuat mikroenkapsulat pepton ikan hasil tangkapan sampingan (HTS) multispesies busuk yang dibalut dengan kombinasi bahan penyalut maltodekstrin dan natrium kaseinat. Mikroenkapsulat pepton ikan HTS multispesies busuk memiliki komposisi kimia yaitu kadar air 6,61%, kadar abu 1,67%, kadar protein 32,40%, dan kadar lemak 0,38%. Karakteristik kimia produk yang dihasilkan antara lain rendemen 52,57%, kelarutan 45,28%, total nitrogen 4,20%, α-amino nitrogen bebas 0,21 g/100 g, AN/TN 5%, kadar garam 0,40%, pH 5,66, dan gula pereduksi 16,22%. Karakteristik fisik yang diukur adalah derajat putih dengan nilai 95,37%. Nilai aktivitas air (aw) produk dapat dikatakan rendah karena pada jam pertama memiliki nilai aw sebesar 0,416 dengan kemungkinan daya simpan yang baik. Hasil pengukuran optical density (OD) menunjukkan adanya pola pertumbuhan pada bakteri Staphylococcus aureus dan Escherichia coli.
Keyword: Ikan hasil tangkapan sampingan, mikroenkapsulasi, pepton

Judul: Karakteristik Mikroenkapsulat Pepton Berbahan Dasar Ikan HasilTangkapan Sampingan (HTS) Multispesies Busuk dengan MetodeSpray Drying dan Bahan Penyalut Maltodekstrin
Abstrak: This research aim is to produce peptone with spoiled by cath fish as a raw materials using microencapsulation technique and maltodeskstin as a coating inngridients.. Microencapsulate of peptone has chemical composition with moisture content 8.95%, ash content 5.26%, protein content 62.79%, fat content 0.44% and carbohydrate content 21.48%. The chemical characteristic peptone by-catch spoiled fish indicate that product has solubility 98.87%, nitrogen total 10.05%, α amino nitrogen 1.22%, AN/TN 12.14%, salt content 8.04% and pH 6.69. Microencapsulate peptone has physical characteristic with dominatic colour yellow to redness. Water activity of microencapsulate spoiled by cath fish peptone at room temperature of storage during 5 hours was lower than peptone spoiled by cath fish without microencapsulation and comercial product of peptone. The amino acid content of microencapusalate spoiled by cath fish peptone consist of 15 amino acid that consist of 9 esensial amino acid and 6 non esensial amino acid. Microorganism growth kurve with optical density (OD). That indicate microencapsulate spoiled by cath fish peptone has bacterial growth kurve more good than comercial product of peptone and peptone spoiled by cath fish without microencapsulation.
Keyword: peptone, microencapsulation, characteristic, by-catch fish

Judul: Tree berdiameter lima adalah graceful
Abstrak: This manuscript presents some proofs that every tree of diameter five is graceful. A graceful tree is a graph which has a graceful labelling. This labelling assigns absolute difference of connected vertices, such that the resulting edge labels are mutually distinct. There are three theorems to be considered. First theorem proves that every tree of diameter four is graceful. Second theorem proves that every tree of diameter five is graceful or nearly graceful. The third theorem improves the second theorem and shows that every tree of diameter five is nearly graceful, which can be transformed into graceful using some certain patterns.
Keyword: Graf, Pelabelan graceful, Bogor Agricultural University, Institut Pertanian Bogor, IPB