Judul: Penggunaan daya hantar listrik (DHL) sebagai indikator isoosmotik untuk kinerja produksi benih ikan nila Oreochromis niloticus
Abstrak: Penelitian ini bertujuan untuk mengevaluasi penggunaan parameter daya hantar listrik tubuh dan media dalam menentukan media mendekati isoosmotik bagi tubuh benih ikan nila, serta melihat pengaruhnya terhadap kinerja produksi benih ikan nila. Penelitian ini terdiri atas dua tahap. Pertama adalah penentuan media yang mendekati isoosmotik, melalui pengukuran daya hantar listrik media dan tubuh ikan. Pada tahap pengukuran daya hantar listrik diperoleh media yang mendekati isoosmotik pada berbagai ukuran ikan sebesar 5,09-4,29 ppt. Pada tahap berikutnya dilakukan pemeliharaan benih ikan nila berukuran 7-8 cm selama 10 hari pada salinitas 0 ppt, 4 ppt, dan 6 ppt, sebagai pembuktian. Masing-masing perlakuan diberi dua ulangan dengan menggunakan rancangan acak lengkap. Pakan diberikan dengan frekuensi pemberian 3 kali sehari. Pada tahap ini diperoleh perlakuan 4 ppt yang menunjukkan kinerja pertumbuhan (pertumbuhan panjang mutlak, pertumbuhan bobot harian, dan laju pertumbuhan bobot harian) yang terbaik dengan sintasan diatas 95%. Kondisi kualitas air selama pemeliharaan masih berada pada kisaran yang dapat ditoleransi oleh ikan.
Keyword: Conductivity, Salinity, Isoosmotic, Growth, Survival rate

Judul: Penentuan Kondisi Isoosmotik Benih Ikan Nila Oreochromis Niloticus dan Patin Pangasius sp. Berdasarkan Gradien Daya Hantar Listrik (DHL) Media dan Tubuh Ikan.
Abstrak: The production of Nile Tilapia and Channel Catfish increase every year. The purpose of this study was to quantify the value of DHL in media and fish body’s, getting isoosmotic medium to juvenils life and to know it’s effect on growth and survival rate juvenils. This research consist of two phases, the major study was to measure the electrical conductivity of media and the fish body’s, and the second experiment was to cultivated Nile Tilapia and Channel Catfish for 20 days. The results showed that there was a positive correlation between DHL with salinity. Based on preliminary research, retrieved value approached isoosmotic for Nile Tilapia ranged from 5,30 mS/cm to 5,95 mS/cm, while for Channel Catfish ranged from 6,20 mS/cm to 6,35 mS cm or on 4 ppt salinity. Based on major research found that DHL can affect the growth and survival rate for juvenils significantly (P<0,05), for Nile Tilapia survival rate reached 97,5% and the Channel Catfish had a high growth rate is 5,30%/day.
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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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