Judul: Identifikasi Kesehatan Karang Famili Fungiidae di Perairan Indonesia
Abstrak: Kondisi ekosistem terumbu karang saat ini mengalami tingkat kerusakan yang cukup tinggi. Hal ini disebabkan oleh beberapa faktor yaitu, faktor alam dan aktivitas manusia. Karang jamur (Fungiidae) merupakan salah satu karang yang dapat hidup soliter (free-living) dan hidup di berbagai macam substrat. Karang jamur (Fungiidae) dipilih karena memiliki kemampuan untuk menghindar dari organisme kompetitor yang berbahaya bagi dirinya. Penelitian ini bertujuan untuk mengetahui jenis-jenis gangguan kesehatan karang, kelimpahan gangguan kesehatan karang dan prevalensi karang sehat dan karang yang kesehatannya terganggu yang terdapat di perairan Indonesia. Penelitian dilaksanakan pada tahun 2011-2013 (diluar Pulau Pramuka) dan 2020 (Pulau Pramuka) dengan mengambil 67 titik pengamatan yang tersebar di 20 provinsi di perairan Indonesia. Metode yang digunakan adalah Belt Transect dengan ukuran 2 x 50 meter. Berdasarkan penelitian yang dilakukan ditemukan 8 genus dari Famili Fungiidae dengan genus Fungia yang mendominasi. Gangguan kesehatan karang yang ditemukan berjumlah 12 jenis. Gangguan Kesehatan karang yang paling banyak ditemukan adalah Yellow band disease dengan kelimpahan sebesar 3,064 ind/m2 dan prevalensi sebesar 26,377%., The condition of the coral reef ecosystem is currently experiencing a high level of damage. This is caused by several factors, namely, natural factors and human activities. Mushroom coral is one of the corals that can live solitary (free- living) and live in various kinds of substrates. Mushroom coral was chosen because it can avoid harmful competing organisms for itself. This study aims to determine the types of compromised coral health, the abundance of coral with compromised health, and the prevalence of healthy coral and coral with compromised health found in the Indonesian sea. The research was conducted in 2011-2013 (outside Pramuka Island) and 2020 (Pramuka Island) by taking 67 observation points spread across 20 provinces in Indonesian waters. The method used was Belt Transect with a size of 2 x 50 meters. Based on the research conducted, 8 genera of the Fungiidae family were found with the predominant genus Fungia. There were 12 coral with compromised health. The most common disease found was Yellow band disease with an abundance of 3.064 ind / m2 and a prevalence of 26.377%.
Keyword: terumbu karang, karang jamur, fungiidae, kesehatan karang

Judul: Kesehatan Karang Fungiidae di Pulau Pari, Kepulauan Seribu
Abstrak: Coral disease is one of the main causes of the decline of coral reef ecosystems. Fungiidae had been chosen because if compared to other corals, Fungiidae had an advantage in the ecological quantitative survey. The study aims to measure the level of coral health based on abundance and prevalence of coral health category. The study was conducted on 24 to 25 November 2013 in Pari Island, Thousand Islands on 4 stations spread. The method used in this study is Belt Transect method with 2 x 100 meters and Line Intercept Transect ( LIT ) along 30 meters with three replications. Based on the research conducted, 5 Fungiidae was found with Fungia genus dominated. The health condition of corals Fungiidae in Pari Island is divided into fourcategories that are 35% healty and 65% sick consisting of tissue discoloration-white (coral bleaching), tissue discoloration-non white (yellow band disease), and compromised health (sedimentation damage).
Keyword: coral disease., coral bleaching, coral health, Fungiidae

Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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