Judul: Aplikasi Multibeam dan Side Scan Sonar untuk Mendeteksi Target Runtuhnya Jembatan Kartanegara di Kutai Kalimantan Timur
Abstrak: Kutai Kartanegara bridge is a suspension bridge crossing over Mahakam River in East Kalimantan. This bridge is to facilitate between Tenggarong and Samarinda city. However, on 26 November 2011 Kutai Kartanegara bridge damaged. Thus, pushing many people took to the field for the evacuation and search for the cause of the accident. The objectives of this research are to find out bottom information such as water depth and position of the target from the collapsed bridge to assist in the evacuation process. Multibeam and side scan sonar (sss) is a hydroacoustic instrument capable of detecting bathymetry and determine the condition of the sea bottom. In this survey, the data acquisitions are conducted by using a Multibeam Reson Hydrobat and SSS EdgeTech 4200. Bathymetric data were processed using PDS 2000 and a Caris HIPS & SIPS 6.1 software, side scan sonar data were processed with SonarWeb and a Caris HIPS & SIPS 6.1 software, and analism of the amplitude value from the target with the help of SeiSee and a Xtf2segy software. The results of the research are bathymetry map with depths ranging from 4.07 meters to 58.15 meters and found the targets of sea bottom that have the shape of frame of the bridge, target-shaped box / square, strap-shaped targets, target-shaped small bumps, and target objects straped. The mosaics of acoustic wave reflection intensity were resulted from the sea bottom and have been obtained the estimation value of the highest amplitude from the target shape of frame bridge is 7200 – 7974 mV and the lowest of the substrate around the strap-shaped target is 258-454 mV.
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Judul: Aplikasi Instrumen Multibeam Sonar dan Side Scan Sonar untuk Deteksi Kapal Karam (Contoh Studi Kapal Bahuga Jaya di Perairan Selat Sunda)
Abstrak: Multibeam Sonar and Side Scan Sonar are acoustic technologies that are used to detect underwater objects by using sound waves. This study aim to detect shipwreck Bahuga Jaya in waters bottom that crashed and sank on 26 September 2012. The instruments that used were Multibeam Sonar ELAC SEA BEAM 1050D and Side Scan Sonar EdgeTech 4200. Data processing using softwares CARIS HIPS & SIPS 6.1, MBSystem, Surfer and Sonar Web. Tidal type in the study area was mixed dual skew tide. Sound speed value ranges was between 1543.64 m/s - 1544.99 m/s. Bahuga Jaya wreck coordinate was at 05o52’44.53’’ S and 105o51’11.60’’ E. Water depths ranging is between 40 m to 150 m. From the point of collision, the vessel Bahuga Jaya moved 537 m far to the east away. Wreck dimension detected 90 m long and 14.8 m wide. Backscatter amplitude value of the wreck is is 717.25 mV showed the greatest value in comparison with the surrounding objects.
Keyword: amplitude backscatter, depth, Bahuga Jaya, Side Scan Sonar, Multibeam Sonar

Judul: Respon Sel Leydig Dari Mencit Neonatal Terhadap Hcg Selama Kultur In Vitro.
Abstrak: Sel Leydig merupakan sel penghasil hormon testosteron pada hewan jantan. Berdasarkan tingkat kematangan, populasinya terbagi menjadi sel Leydig fetal dan sel Leydig dewasa. Hormon human chorionic gonadotropin (hCG) adalah salah satu faktor yang memengaruhi proliferasi dan diferensiasi pada sel Leydig dewasa, tetapi belum diketahui pengaruhnya pada sel Leydig fetal. Penelitian ini bertujuan untuk menjajaki respon sel Leydig fetal terhadap penambahan hCG pada kultur in vitro dengan menggunakan sel Leydig yang diisolasi dari mencit neonatal. Sel Leydig diisolasi dari mencit neonatal umur tiga hari, dikultur in vitro selama enam hari, dan diberi perlakuan dengan dan tanpa penambahan hCG. Data yang dievaluasi berupa tingkat proliferasi (population doubling time, PDT) dan jumlah sel yang mengekspresikan keberadaan enzim 3β-HSD. Hasil penelitian menunjukkan bahwa penambahan hCG pada kultur in vitro sel Leydig dewasa meningkatkan proliferasi sel, sebaliknya pada sel Leydig fetal menurunkan proliferasi sel. Penambahan hCG tidak memengaruhi persentase jumlah sel Leydig dari mencit neonatal yang mengekspresikan enzim 3β-HSD. Dapat disimpulkan bahwa sel Leydig fetal dari mencit neonatal memiliki respon yang berbeda dengan sel Leydig dewasa terhadap penambahan hCG secara in vitro.
Keyword: hCG, kultur in vitro, mencit neonatal, proliferasi, sel Leydig