Judul: Maskulinisasi Ikan Cupang Betta splendens dengan Ekstrak Tanaman Purwoceng Pimpinella alpina Melalui Perendaman Artemia
Abstrak: Ikan cupang Betta splendens jantan memiliki keindahan warna serta sifat yang agresif sehingga banyak diminati dan memiliki harga jual yang lebih tinggi. Penelitian ini dilakukan untuk menguji penggunaan ekstrak tanaman purwoceng dengan teknik perendaman artemia pada maskulinisasi ikan cupang. Penelitian ini menggunakan rancangan acak lengkap dengan tiga perlakuan dosis ekstrak tanaman purwoceng (20, 40, dan 60 mg/L), perlakuan 17α-methyltestosterone (MT) 500 μg/L dan kontrol dengan masing-masing tiga ulangan setiap perlakuan. Artemia bervolume 100 mL diperkaya selama 24 jam melalui perendaman dan diberikan pada larva sejak berumur 4 hari setelah penetasan hingga 40 hari. Jenis kelamin ikan yang telah berumur 2 bulan diidentifikasi. Hasil penelitian menunjukkan bahwa perlakuan ekstrak tanaman purwoceng 20 mg/L memberikan nisbah kelamin jantan (75,00%) dan kelangsungan hidup (86,67%) tertinggi bila dibandingkan dengan kontrol (40,00 % dan 77,78%) dan perlakuan dengan 17-α methyltestosterone (MT) 500 μg/L (62,50% dan 46,67%). Dengan demikian, ekstrak tanaman purwoceng dapat digunakan untuk maskulinisasi ikan cupang melalui perendaman artemia dengan dosis terbaik adalah 20 mg/L yang membuat nisbah kelamin jantan ikan cupang lebih tinggi dari kontrol.
Keyword: artemia, Betta splendens, ekstrak tanaman purwoceng P. alpina, maskulinisasi, perendaman

Judul: Maskulinisasi Ikan Cupang (Betta splendens) Melalui Perendaman Embrio dalam Ekstrak Purwoceng (Pimpinella alpina)
Abstrak: This study aimed to know the effect of extract of P. alpina for masculinization of Betta splendens. This research used the Completely Randomized Design with 3 treatments that were distinguished by doses of extract of P. alpina, those are 10, 20, and 30 μL/L, and 0 μL/L as control. The treatments are given to 35 embryos by immersion in extract of Pimpinella alpina when eye spots phase or about 28th hour after fertilization. The immersion process was done for 8 hours. The result showed that 20 μL/L dose of P. alpina’s extract produced male fish percentage 62,66%, it’s higher than control (45,91%), and hatching rate was 85,71%. At the higher dose (30 μL/L), male fish population and hatching rate went down with each value 39,72% and 68,57%.
Keyword: 

Judul: Implementation of Spatio-Temporal Change Query in Relational Database.
Abstrak: Geographic object changes in various views. Object changes are recorded using a model of static storage. No historical connection between old version data and new version data has been built. For that, a storage model of spatio-temporal queries that can analyze spatio-temporal changes has been developed. The object changes the geometry are grouped according to the taxonomy of Spatio-Temporal Pattern Change. This research has been able to apply the query patterns change including born, expand, merge, contract, split, normal and die. This query based on geometric (area) changes. The implementation of spatio-temporal change queries represents an object changes continuously with easy, change detection is done by comparing two versions of data. Keyword: spatio-temporal change query, spatio-temporal change pattern.
Keyword: