Judul: Aplikasi Pencari SPBU Terdekat di Area Bogor dengan Location Based Service Berbasis GPS pada Android
Abstrak: Nowadays mobile phones are not only used as a means of communication, but also by taking advantage of some features such as the global positioning system (GPS), a mobile phone can be used as a navigational tool from user position to object around the user. Gas station is one of the point of interest (POI), because its location is very useful especially for motorists. This study aimed to build an application of location based services (LBS) in the Bogor area, to display the gas station on the map, to determine the nearest gas station that is located around the user and to display the route to the gas station. The application is built for the Android smartphone, with Java programming language, SQLite as the database storage, GPS to obtain the user's position and Google Maps as the map viewer. From the test conducted, this system has been able to work well and produce correct output.
Keyword: Android, location, LBS, GPS, gas station

Judul: Aplikasi Mobile GIS Pencarian Tempat Olahraga di Bogor.
Abstrak: The location of sport facilities that are difficult to find has made location search system such as location based services (LBS) more important. Global positioning system (GPS) feature on the smartphone makes it possible to use smartphone as a navigation tool. The purpose of this research is to develop a LBS application that is used as mobile GIS search location in Bogor. The application is developed by using the Android-based smartphones, GPS to obtain the position of users, and Google Maps as map viewer. This research was carried out by using the prototype method that consists of several stages, namely: problem identification, prototype development, operational system coding by using App Inventor, and testing. Evaluation was conducted until the system is acceptable and can perform the desired functionality. The result of this research is an application system that can show the locations of sport facilities in Bogor.
Keyword: location based service, Google Maps, global positioning system, App Inventor, Android

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