Judul: Pengaruh Pemberian Probiotik Komersial Terhadap  Penurunan Populasi Sel Escherichia coli dalam Air
Abstrak: Perkembangan bakteri patogen Escherichia coli dapat menyebabkan penurunan kualitas perairan apabila memiliki populasi yang melebihi baku mutu. Jumlah bakteri E. coli dapat dikendalikan dengan menggunakan probiotik komersial yang mengandung bakteri Streptomyces. Penelitian ini bertujuan untuk menentukan dosis probiotik yang efisien untuk mengendalikan jumlah populasi bakteri E. coli di dalam air tawar. Probiotik didapat dari produk komersial yang beredar di pasar dan air uji diperoleh dari Situ Gede, Kabupaten Bogor. Probiotik dimasukkan kedalam air dengan dosis 0,1 ppm, 0,5 ppm dan 1,0 ppm dan kontrol, dengan desain penelitian menggunakan rancangan acak lengkap yang masing masing diulang sebanyak tiga kali. Pengamatan pertumbuhan bakteri berupa Total Plate Count (TPC), diamati sebelum perlakuan dan setiap 12 jam setelah perlakuan. Parameter kualitas air sebagai penunjang meliputi parameter suhu, oksigen terlarut dan pH. Hasil pengamatan yang dilakukan selama 36 jam menunjukkan bahwa dosis 0,5 ppm merupakan dosis yang paling signifikan dalam menekan pertumbuhan populasi E. coli., The growth of E. coli pathogenic bacteria can lead to decrease the quality of the waters if it has a population that exceeds the quality standard. The amount of E. coli bacteria can be controlled by using commercial probiotics contained Streptomyces bacteria. The study aims to determine efficient doses of probiotics to control the number of populations of E. coli bacteria in freshwater. Probiotics are obtained from commercial products circulated on the market and test water is obtained from Situ Gede, Bogor Regency. In one liter of test water was inserted probiotics with doses of 0.1 ppm, 0.5 ppm and 1.0 ppm and control, with the research design using RAL which was repeated three times each. Observation of bacterial growth in the form of Total Plate Count (TPC), observed before treatment and every 12 hours after treatment. Water quality parameters as supporting which include temperature parameters, dissolved oxygen and pH. Observations made over 36 hours showed that a dose of 0.5 ppm was the most significant dose of suppressing E. coli population growth
Keyword: commercial probiotics, dose, Escherichia coli, water quality

Judul: The Effects of Thiobacillus sp. Probiotics Application to  Water Quality of Shrimp Pond Wastewater
Abstrak: Senyawa beracun seperti H2S, amonia, nitrit, dan nitrat di tambak dapat berasal dari perombakan bahan organik yang tertimbun di sedimen. Usaha yang dilakukan untuk menciptakan kualitas air yang baik, salah satunya adalah dengan aplikasi bakteri probiotik. Penelitian ini bertujuan untuk menganalisis pengaruh penerapan bakteri probiotik Thiobacillus sp. terhadap kualitas air pada limbah tambak. Penelitian ini menggunakan rancangan RAL in time dengan empat perlakuan. Perlakuan yang diberikan yaitu penambahan konsorsium Thiobacillus sp. dengan dosis 0 ppm (kontrol), 0,1 ppm, 0,2 ppm, dan 0,4 ppm. Parameter yang diamati yaitu suhu, pH, DO, amonia, nitrit, nitrat, H2S, serta penghitungan kelimpahan total bakteri. Hasil menunjukkan bahwa penambahan probiotik yang mengandung Thiobacillus dapat meningkatkan kelimpahan total bakteri pada air limbah. Penambahan probiotik memberi pengaruh terhadap penurunan konsentrasi nitrit dan nitrat pada beberapa perlakuan. Namun, penambahan probiotik tidak berpengaruh pada penurunan konsentrasi H2S dan TAN., Toxic compounds such as H2S, ammonia, nitrite, and nitrate in ponds can come from the breakdown of organic matter in ponds sediments. Good ponds water quality could be created by the application of probiotic bacteria. This study aims to analyze the effect of Thiobacillus sp. probiotic application on water quality of pond wastewater. This study used the RAL design in time with four treatments. The treatment given was the addition of a consortium of Thiobacillus sp. with doses of 0 ppm (control), 0.1 ppm, 0.2 ppm, and 0.4 ppm. The parameters observed were temperature, pH, DO, ammonia, nitrite, nitrate, H2S, and the abundance of total bacteria. The results showed that the addition of probiotics containing Thiobacillus could increase the total bacteria in wastewater. The addition of probiotics had an effect on decreasing of nitrite and nitrate concentration in several treatments. However, the addition of probiotics had no effect on decreasing of H2S and TAN concentration.
Keyword: probiotic, Thiobacillus, wastewater, water quality

Judul: Klasifikasi Sidik Jari Menggunakan Support Vector Machine Dengan Feature Berbasis Minutiae Menggunakan Metode Region
Abstrak: Manual fingerprint classification proceeds by carefully inspecting the geometric characteristics of major ridge curves in a fingerprint image. This research proposed an automatic approach of identifying the geometric characteristics of ridges based on minutiae position and angle. Position and angle of minutiae are analyzed using region method. Region was used to discretize the number of minutiae. Positions of minutiae in a region give information about its relation to another region. Angles of minutiae indicate the ridge flow direction. Support vector machine, a binary classifier, is used to classify the fingerprint based on those characteristics. In this research, the classes are left loop, right loop, whorl, arch and tented arch. This research used 2695 fingerprint images from NIST. Classification performance is measured using 3-fold cross validation method. This research achieved 79.7 % accuracy. As we only used local features in this research, further research needs to be conducted especially to investigate global features.
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