Judul: Rendezvous Search Pada Garis Dengan Tiga Pemain
Abstrak: Pada suatu lapangan luas dengan lintasan kereta api melintasi seluruh daerah tersebut, tiga orang penerjun ditetjunkan. Mereka telah menyepakati sebelumnya untuk bertemu di I[ntasan kereta api tersebut, tetapi belum tahu letak yang sebenarnya untuk bertemu. PenCanan dilaknkan di sepanjang lintasan kereta api dan untuk memecahkan masalah ini digunakan rendezvous search pada garis.
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Judul: Rendezvous Search Pada Garis Dengan Lebih Dari Dua Pemain
Abstrak: Pada suatu jalan raya, lebih dari dua orang yang bersahabat, telab sepakat akan bertemu di jalan tersebut, tetapi mereka tidak tahu di mana letak sebenarnya mereka akan bertemu. Pencarian dilakukan sepanjang jalan raya tersebut dan untuk memecahkan masalah ini digunakan rendezvous search pada garis. Penelitian ini dilakukan untuk membanlu para pemain agar mereka dapal bertemu datam waktu yang minimum. Pada awal penempatan di jalan raya, setiap pemain mengetahui posisi masing-masing tetapi tidak mengetahui posisi pemain lain. Mereka bergerak dengan kecepatan paling besar 1 untuk bertemu.
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Judul: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology