Judul: Hubungan Panjang-Berat Stichopus Ocellatus (Holothuroidea) Di Kepulauan Seribu, Jakarta
Abstrak: Stichopus ocellatus merupakan teripang ekonomis penting yang ada di Indonesia maupun dunia. Data mengenai spesies ini belum banyak dieksplorasi. Tujuan dari penelitian ini adalah untuk menganalisis hubungan panjang-berat dan keragaman genetik dari Stichopus ocellatus. Metode yang digunakan adalah DNA Barcoding dengan marka mitokondria lokus CO1. Pohon filogenetik dan jarak genetik menunjukkan adanya sedikit perbedaan urutan basa antar individu. Komposisi basa nukleotida Adenin (A) dan Timin (T) lebih banyak dibandingkan Sianin (C) dan Guanin (G). Hal ini berkaitan dengan ikatan hidrogen yang mengikat basa tersebut. Kemungkinan terjadinya transisi lebih besar dari transversi karena berkaitan dengan karakteristik dari purin dan pirimidin. Hubungan panjang-berat menunjukkan pola pertumbuhan allometrik negatif yaitu pertumbuhan panjang lebih dominan dibandingkan pertumbuhan berat. Keragaman genetik termasuk dalam kategori tinggi berdasarkan nilai keragaman haplotipe (0.8498 ± 0.0521) dan keragaman nukleotida (0.0074 ± 0.0042).
Keyword: teripang, DNA Barcoding, hubungan panjang-berat, keragaman genetik, coral triangle

Judul: Pendugaan Keragaman Genetik Ikan Baronang (Siganus canaliculatus) Dilihat Dari Perbedaan Lingkungan Dari Teluk Jakarta Ke Kepulauan Seribu
Abstrak: Terumbu karang sangat dipengaruhi oleh pengaruh aktivitas manusia contohnya polusi dan berkurangnya luasan habitat , dan menignkatnya permukaan air laut atau kenaikan suhu temperatur suhu air laut itu disebabkan karena perubhana global. Di Indinesia, komunitas organisme laut telah dipengaruhi oleh peningkatan eutrifikasi dan sedimintasi yang terlihat di Perairan Teluk Jakarta. Sebagai hasil dari peningkatan sedimentasi, masukan nutrien dan kontaminasi bahan kimia, terumbu karang akan mengalami penurunan kondisi dan dapat mempengaruhi biota organisasi seperti ikan baronang. Analisis AMOVA menunjukkan nilai Fst yang tinggi 0.37959, hal ini membuktikan bahwa populasi Siganus canaliculatus pada zona utara (taman nasional) dan zona selatan Kepulauan Seribu signifikan berbeda dan kedua populasi tersebut sangat dekat. Hasil jarak genetik yang didapatkan 0.007 – 0.062 termasuk dalam kategori rendah. Nilai keragaman genetik (Hd) dari Siganus canaliculatus terbesar terdapat pada Pulau Semak Daun dan Pulau Damar yaitu sebesar 0.50 dan keragaman nukleotida ( ) yang tertinggi sebesar 0.104. Keragaman genetik dari Siganus canaliculatus termasuk kategori rendah 0.076 sampai sedang 0.500. Lingkungan dan manusia dapat mempengaruhi nilai keragaman genetik.
Keyword: Analisis AMOVA, jarak genetik, Kepulauan Seribu, keragaman genetik, Siganus canaliculatus, tingkat signifikan

Judul: Exergy Analysis of Membrane Utilization for Solution Separation in LiBr-H2O Absorbtion Refrigeration System
Abstrak: Absorbtion refrigeration system provides prominent advantages in tems of environmental impact and energy consumption. Absorbtion refrigeration system uses natural refrigerant, such as water, which gives no harm to the environment. In terms of energy consumption, it requires heat to regenerate refrigerant from its absorber and provide the refrigeration effect. This form of energy is preferred since heat can be supplied from various sources, including waste heat and renewable energy, and thermodynamically categorized as low quality energy. However, effectiveness of refrigerant regeneration could only be obtained if the temperature is high enough. In this study, the heat utilization in the regeneration process will be eliminated by introducing membranes for separating the refrigerant from the absorber. Specifically, the objectives of this research are to :1) to study the absorbtion mechanism of water vapor by LiBr-H2O solution in a controlled condition, 2) to study the regeneration process of LiBr-H2O using reverse osmosis (RO) membrane and vacuum membrane distillation (VMD) when applied in LiBr-H2O absorbtion refrigeration system, 3) to perform the energy and exergy analysis in LiBr-H2O absorbtion refrigeration system using RO membrane. The membrane was used as a tool to separate the refrigerant from absorbent which performs as regeneration process in conventional absorbtion system. As separation component, RO membrane employs pressure to oppose the osmotic pressure and pass certain component through the pores. While, VMD employs vacuum pressure and thermal, so that the substance to be transported through the membrane is in form of vapor. The result shows that absorbtion rate of water vapor by LiBr-H2O solution was influenced by solution concentration, temperature, humidity and pressure. The highest absorbtion rate was 0.031 g/minute which was occurred at temperature 40°C, RH 70% and solution concentration 60%. Prediction model was developed to calculate the absorbtion parameter inspite of P-T-X diagram.The highest water vapor absorbtion in absorber using spiral wound module-based RO membrane occurred at initial concentration of 30%, wich is the highest concentration used in the experiment. Increasing of operation pressure during separation process will increase permeation flux but decrease rejection factor.Unexpectedly, permeate of the RO membrane still contain LiBr at concentration 7w/w %-9w/w%, which affect the achievable cooling temperature and cooling capacity. Optimization of regeneration using VMD was conducted with response surface methodology (RSM) and the result show that highest permeate flux (0.93 kg.m-2.s-1) can be achived at initial concentration of 47.5%, temperature of 80°C and flow rate of 1.9 L.min-1.COP obtained in absorbtion refrigeration system using RO membran with initial concentration 20% was in the range of 1.147-1.171. Exergy analysis shows that increasing pressure of RO membrane at concentration 20% increased the irreversibity.On the other hand, exergy analysis on VMD shows that higher concentration and temperature will increased irreversibility.
Keyword: refrigeration, absorbtion, reverse osmosis, vacuum membrane distillation, energy, exergy