Judul: Produksi Pepton dari Ikan Kembung Tidak Layak Konsumsi Sebagai Media Alternatif Pertumbuhan Yeast Penghasil Selenium Organik
Abstrak: Ikan kembung tidak layak konsumsi adalah salah satu jenis ikan pelagis kecil yang berkadar protein tinggi dan kadar lemak rendah. Ikan kembung dan limbah cair sari kurma termasuk ke dalam kelompok limbah perikanan dan pertanian yang belum dimanfaatkan secara optimal dan menjadi permasalahan lingkungan. Penelitian ini bertujuan memproduksi pepton dari ikan kembung tidak layak konsumsi dan dextrose asal limbah cair sari kurma dan membandingkan karakteristik pepton tersebut dengan pepton komersial. Pepton ikan dihidrolisis menggunakan enzim papain pada kondisi optimum, yaitu konsentrasi 0,3% dan waktu hidrolisis selama 5 jam. Pepton ikan kembung tidak layak konsumsi memiliki kelarutan 99,95%, total nitrogen 12,08%, a-amino nitrogen bebas 1,96%, rasio AN/TN 16,22%, kadar garam 7,85%, dan pH 7,00. Pepton ikan kembung tidak layak konsumsi dan dextrose asal limbah cair sari kurma yang ditumbuhkan pada media pertumbuhan Wickerhamomyces anomalus sebagai Se-Yeast memiliki kecepatan pertumbuhan lebih tinggi dibandingkan pepton dan dextrose komersial., Spoiled mackerel fish is a type of small pelagic fish that has a high protein content and low fat content. Mackerel fish and extract date palm by- product are included in the group fisheries and agricultural wastes that have not been used optimally and are still an environmental problem. This study aimed to produce peptone form spoiled mackerel fish and dextrose from extract date palm by-product compared the characteristics of these peptones with commercial peptones. fish peptone was produced by hydrolysis process using papain enzyme at optimum conditions, 0.3% papain enzyme 5 hours hydrolysed process. The results showed that peptone form spoiled mackerel fish had protein of 75.54%, solubility of 99.95% , nitrogen of 12.08%, a-Amino fee nitrogen of 1.96%, AN/TN ratio of 16.22%, salt of 7.85% , and pH of 7.00. The results of the analysis of the average growth rate indicated that the media containing spoiled mackerel fish peptone and dextrose from extract date palm by-product has higher growth speed on W.anomalus as selenium yeast than commercial peptone and dextrose.
Keyword: extract date palm by-product, mackerel fish, papain, peptone, Wickerhamomyces anomalus

Judul: Aplikasi Pepton Berbahan Baku Ikan Hasil Tangkap Sampingan (HTS) Busuk Sebagai Komponen Media Pertumbuhan Bakteri dan Khamir
Abstrak: Fish of by-catch has a high protein content, which is potential to be used as peptone. This research aimed to produce peptone from spoiled by-catch fish and applicate it as component of bacteria and yeast growth media. Peptone from by-catch fish has protein content of 77,93%. Growth of bacteria Escherichia coli, Staphylococcus aureus and yeast Saccharomyces cereviciae analyzes by OD and TPC. Growth rate of E.coli in media with peptone from by-catch fish is 0.062 per hour, meanwhile control is 0.071 per hour and commercial peptone is 0.072 per hour. Growth rate of S.aureus in media with peptone from by-catch fish is 0.047 per hour, meanwhile control is 0.042 per hour and commercial peptone is 0.039 per hour. Growth rate of yeast S. cerevisiae in media with peptone from by-catch fish is 0.167 per hour, meanwhile control is 0.160 per hour and commercial peptone is 0.166 per hour
Keyword: growth media, fishery by-product, fish peptone

Judul: Tinjauan Matematis pada Model Makroskopik dan Mikroskopik Arus Lalu-lintas
Abstrak: Traffic flow phenomenon can be described through mathematical model such as continuous dynamic model with an ordinary differential equation so that it can be solved with integral factors. In this paper three simple models of traffic flow are discussed, i.e, two macroscopic and one microscopic models. Macroscopic model formulates dynamics of the traffic flow that occurs on a large number of vehicles on a road. While the microscopic model explains drivers’ behavior in their interaction with other vehicles ahead, i.e, car-following model. This paper shows the existence of ordinary differential equation found in the traffic flow model and indicates some different representations in the context of the same model. It also reviews a simple model of traffic flow along a single link, which leads to some unexpected results, i.e, it can express the solution model in term of link outflows as well as trip time. In the microscopic model, simulation is done to illustrate the behavior of the drivers with a sensitivity coefficient as a benchmark parameter.
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