Judul: Cultivation of Microalgae Arthrospira  platensis in palm oil mill effluent Media with Different Concentrations
Abstrak: Tingginya kebutuhan nutrien bagi pertumbuhan A. platensis berakibat pada pemenuhan kebutuhan pupuk yang tinggi. Salah satu cara mengatasi hal tersebut adalah dengan pemanfaatan limbah tinggi nitrogen hasil olahan minyak kelapa sawit berupa limbah cair yang dikenal dengan nama palm oil mill effluent (POME) sebagai media pertumbuhan A. platensis. Penelitian ini bertujuan mengevaluasi konsentrasi POME yang efektif sebagai media pertumbuhan A. platensis. Inokulan A. platensis diinokulasi ke dalam 15 unit wadah berukuran 15 L dan ditambahkan POME dengan konsentrasi berbeda, yaitu 10% v/v (P10), 20% v/v (P20), dan 30% v/v (P30) dan tanpa penambahan POME sebagai kontrol (K). Kepadatan A. platensis diukur menggunakan spektrofotometer pada panjang gelombang 680 nm. Kepadatan awal yang digunakan pada awal pemeliharaan memiliki nilai absorbansi optical density (OD) berkisar 0,50–0,55. Parameter yang diukur adalah laju pertumbuhan spesifik (LPS), biomassa panen A. platensis, efisiensi penurunan chemical oxygen demand (COD) dan efisiensi penurunan biological oxygen demand (BOD). Hasil penelitian menunjukkan bahwa POME dapat digunakan sebagai media pertumbuhan A. platensis. Pada perlakuan konsentrasi POME 10% (v/v), mampu meningkatkan laju pertumbuhan spesifik sel, biomassa serta mampu memanfaatkan karbon organik untuk tumbuh dalam POME yang ditunjukan pada penurunan COD dan BOD., The high need for nutrients for the growth of A. platensis results in meeting the high need for fertilizer. One way to overcome this is by utilizing high- nitrogen waste resulting from processed palm oil in the form of liquid waste known as palm oil mill effluent (POME) as a growth medium for A. platensis. This study aims to evaluate the effective concentration of POME as a growth medium for A. platensis. The A. platensis inoculant was inoculated into 15 units of 15 L containers and POME was added with different concentrations, namely 10% v/v (P10), 20% v/v (P20), and 30% v/v (P30) and without the addition of POME as a control (K). The density of A. platensis was measured using a spectrophotometer at a wavelength of 680 nm. The initial density used at the beginning of maintenance has an optical density (OD) absorbance value ranging from 0.50–0.55. Parameters measured were specific growth rate (LPS), A. platensis harvested biomass, chemical oxygen demand (COD) reduction efficiency and biological oxygen demand (BOD) reduction efficiency. The results showed that POME could be used as a growth medium for A. platensis. In the treatment of 10% POME concentration, it was able to increase the specific growth rate of cells, biomass and was able to utilize organic carbon to grow in POME which was shown in the reduction of COD and BOD.
Keyword: Arthrospira platensis, biomass, BOD, COD, POME

Judul: Potensi Pemanfaatan Limbah Palm Oil Mill Effluent (POME) sebagai Media Kultivasi Mikroalga Chlorococcum dan Dictyosphaerium
Abstrak: Limbah Plam Oil Mill Effluent (POME) memiliki kandungan nutrisi cukup besar yang dapat menunjang pertumbuhan mikroalga. Penelitian ini bertujuan untuk membandingkan pengaruh limbah POME sebagai media kultivasi terhadap pertumbuhan Chlorococcum dan Dictyosphaerium. Ada 2 mikroalga dan ada 3 media yaitu kontrol, POME 20% dan 50% selama periode kultivasi 11 hari. Analisis yang dilakukan adalah perhitungan kepadatan sel, kadar protein, karbohidrat. Hasil menunjukkan bahwa kepadatan sel Chlorococcum dan Dictyosphaerium tertinggi pada POME konsentrasi 50%. Kadar protein tertinggi Chlorococcum dan Dictyosphaerium raw POME berturut – turut sebesar 62943 ± 0.03 ppm dan 59276 ± 0.01 ppm. Kadar protein tertinggi pada Chlorococcum dan Dictyosphaerium treated POME berturut – turut sebesar 37310 ± 0.33 ppm dan 40010 ± 0.06 ppm. Kadar karbohidrat tertinggi pada Chlorococcum dan Dictyosphaerium raw POME berturut – turut sebesar 2143 ± 0.03 ppm dan 1996 ± 0.09 ppm. Kadar karbohidrat tertinggi pada Chlorococcum dan Dictyosphaerium treated POME berturut – turut 1343 ± 0.01 ppm dan 1046 ± 0.03 ppm. Perlakuan POME 50% memiliki pengaruh yang berbeda nyata terhadap kontrol.
Keyword: Chlorococcum, Dictyosphaerium, Kultivasi, POME

Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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