Judul: Kajian Komposisi Hidroksiapatit yang Disintesis dengan Metode Hidrotermal
Abstrak: Accidents are the biggest factors causing injuries all over the world, and generally resulted is the form of stress fracture. The increase in the study on the handling procedures of this issue, the healing processes of bone injury are getting better one of the procedures used by many people’s by using biomaterials. Bone biomaterials commonly used are bioceramics. One of the types of bioceramics is hydroxyapatite. In this research, the synthesis of hydroxyapatite is reported. Synthesis of hydroxyapatite was done by hydrothermal method at a temperature of 150, 200, 250, and 300 oC for 3 hours and sintered at a temperature of 900 oC. At 200 oC synthesized hydroxyapatite was given a further treatment. At a temperature of 200 oC synthesizing procedure was back to the time variation, i.e. 1 hour and 5 hours. The results of the characterization of Fourier Transform Infrared Spectroscopy (FTIR) for all the samples showed hydroxyapatite phase at a temperature of 200 oC. The results of the characterization of Atomic Absorption Spectroscopy (AAS) for all samples showed hydroxyapatite formed is not pure because there are also some other phases.
Keyword: Hydrothermal, Hydroxyapatite, Fourier Transform Infrared Spectroscopy, Atomic Absorption Spectroscopy

Judul: Kajian Struktur dan Morfologi Hidroksiapatit yang Disintesis Menggunakan Metode Hidrotermal
Abstrak: Hydroxyapatite is a material that can be bonded to the building blocks of bone. In this study has been carried out the synthesis of hydroxyapatite using hydrothermal method. Precursor calcium is derived from leghorn chicken eggshell as well as to the source of phosphate using (NH4)2HPO4. In the hydrothermal method to various temperatures of 150 oC, 200 oC, 250 oC, and 300 oC at 3 hours and variations in time of 1 hour and 5 hours at a temperature of 150 oC. Phase and crystal structure of hydroxyapatite were analyzed using X-ray diffractometer (XRD). While the morphology of hydroxyapatite imaged using scanning electron microscopy (SEM). The samples were synthesized using hydrothermal method has formed hydroxyapatite phase. Hydroxyapatite synthesized by hydrothermal method have a value close to the lattice parameter of data JCPDS. XRD characterization results on the various temperatures and hydrothermal time of the 6 samples such as 150 oC, 200 oC, 250 oC, 300 oC for 3 hours and 150 oC at 1 hour, 3 hours, and 5 hours showed that the optimum phase HAp formed it a sample temperature of 150 oC time 3 hours is equal to 98.6% which an efficiency is 45.6%, 78.028 nm crystal size, and degree of crystallinity of 83.4%. Test result by SEM showed that formation of space between microsized HAp particles were clearly visible on the sample. Space of this size is about 2.1 μm.
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Judul: Performa kecoa madagaskar (Gromphadorhina portentosa) pada tipe tempat sembunyi yang berbeda
Abstrak: Madagascar cockroaches come from Madagascar Island in the southest of Africa Beach. This cockroaches is a giant cockroaches in the world and as big as a giant beetle that called as "giant cockroaches". Madagascar cockroaches is a giant cockroaches and have a different character with another cockroaches, that is big size and types that it make it looks like beetle, fizz, doesn't bite, doesn't have wings and outdorless so that these cockroaches harmless for human and can be keep as pets that quite popular all over the world because of it's unique.
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