Judul: Sejarah Hidup Karang Skleraktinia di Perairan Pulau Lancang, DKI Jakarta dan Pulau Mandangin, Jawa Timur
Abstrak: Terumbu karang memiliki kemampuan untuk mempertahankan hidupnya dari stresor. Pendekatan menggunakan sejarah hidup pada karang keras dapat menduga respons yang ditunjukkan oleh karang tersebut. Respons yang diberikan oleh karang dapat berbeda setiap lokasi. Penelitian ini bertujuan untuk mengetahui perbedaan life history karang keras di Pulau Lancang dan Pulau Mandangin. Penelitian dilakukan di Pulau Mandangin, Jawa Timur pada bulan November 2020 dan Pulau Lancang, DKI Jakarta pada bulan April 2021 menggunakan metode Line Intercept Transect dengan panjang transek 20 meter dengan tiga kali ulangan sejajar garis pantai. Aktivitas antropogenik pada kedua pulau cukup tinggi sehingga komposisi komunitas bentik kedua pulau didominasi oleh abiotik. Persentase life history tertinggi di Pulau Lancang adalah stress-tolerant (33,36 ± 3,39%) dan weedy (30,54 ± 3,84%) sedangkan untuk Pulau Mandangin adalah competitive (46,59 ± 12,28%) dilanjutkan dengan weedy (31,50 ± 3,54%). Kategori life history karang keras dari kedua pulau menunjukkan bahwa tidak ada perbedaan signifikan antara karang keras di Pulau Lancang dan Pulau Mandangin karena hasil uji sampel independen menunjukkan nilai sig. 2 tailed >0.05., Coral reefs have an ability to adapt from stressors. Life history of hard coral approaching can predict the response shown by these corals. The response given by corals can vary for each location. This study aims to determine the differences of life history of hard corals on Lancang Island and Mandangin Island. This study was conducted on Mandangin Island, East Java in November 2020 and Lancang Island, DKI Jakarta in April 2021 using the Line Intercept Transect method with a transect length of 20 meters with three replications parallel to the coastline. Anthropogenic activity on the two islands is quite high as of composition of the benthic community of the two islands is dominated by abiotic. The highest percentage of life history in Lancang Island is stress-tolerant (33.36 ± 3.39%) and weedy (30.54 ± 3.84%), while Mandangin Island is competitive (46.59 ± 12.28%), continued with weedy (31.50 ± 3.54%). The hard coral life history category from the two islands shows that there is no significant difference between hard corals on Lancang Island and Mandangin Island because the results of the independent sample t-test test shows sig values. 2 tailed >0.05.
Keyword: Coral reef, Fisheries, Lancang Island, Life history, Mandangin Island

Judul: Sebaran Karang Keras Berdasarkan Kedalaman di Perairan Selat Lombok, Provinsi NTB
Abstrak: Laut yang dimiliki Indonesia sangat luas dengan potensi sumberdaya yang besar harus dikelola dan dieksplorasi demi kepentingan rakyat Indonesia. Salah satu diantaranya adalah kekayaan dan keindahan terumbu karang. Terumbu karang merupakan ekosistem yang rentan dan dapat mengalami kerusakan akibat perubahan faktor lingkungan baik secara alami maupun ulah manusia. Salah satu penyusun ekosistem terumbu karang adalah karang keras. Pertumbuhan karang keras dipengaruhi oleh faktor lingkungan yang menentukan bentuk adaptasi karang keras. Penelitian ini bertujuan mengetahui jumlah dan sebaran genera karang keras berdasarkan kedalaman. Penelitian dilaksanakan pada bulan Maret - April 2021 dengan mengambil lokasi Selat Lombok yang tersebar di 5 kedalaman. Metode yang digunakan adalah Underwater Photo Transect dengan ukuran 1 x 1 meter. Berdasarkan penelitian yang dilakukan. Ditemukan total sebanyak 36 genera karang yang terdiri 21 genera di kedalaman 10 meter, 28 genera di kedalaman 20 meter 26 genera di kedalaman 30 meter,22 genera di kedalaman 40 meter, dan 16 genera di kedalaman 40 meter. Kedalaman mempengaruhi jumlah dan sebaran genera karang keras. Semakin dalam suatu perairan jumlah dan sebaran genus yang ditemukan semakin sedikit., For the people's prosperity, Indonesia has a wide ocean with many great potential resources that must be managed and explored. The diversity of species and the beauty of coral reefs are two of them. Coral reefs are delicate ecosystems that can be harmed by natural and human-caused changes in the environment. Hard coral is an important component of coral reef ecosystems. The form of hard coral adaptation is determined by environmental conditions that influence the growth of hard corals. The goal of this research is to determine the quantity and distribution of hard coral genera depending on their depth of water occurrences. The research took place in the Lombok Straits from March to April 2021 at five different depths. A 1 x 1 metre Underwater Photo Transect was employed as the method. The findings revealed a total of 35 coral genera, with 21 genera found at a depth of ten meters and 28 genera found at a depth of twenty meters. At a depth of 30 meters, there are 26 genera, 22 genera at 40 meters, and 16 genera at 40 meters. The number and distribution of hard coral genera appeared to be influenced by water depth. The number and distribution of genera found decreases as you go deeper into the ocean.
Keyword: genera, karang keras, kedalaman, sebaran, Selat Lombok, depth, distribution, hard coral, Lombok Strait

Judul: Sintesis α-Fe2O3 menggunakan metode sol gel
Abstrak: In this reseach was succeeded make powder α-Fe2O3 with particle size 202.64 nm. Synthesis using Sol-Gel method with SiO2 coating derived from Si(OC2H5)4 at temperature of 750 oC for 5 hours. Characterization XRD prove that sample form is α-Fe2O3 (11 peaks) and β-Fe2O3 (2 peaks) with crystal size 20.69125 nm and crystallization 44 %. The cystal structure of α-Fe2O3 is rhombohedral and β-Fe2O3 is hexsagonal. Optic characterization show that the sample absorbing light at wavelength less than 480 nm. Bandgap energy of the optical characterization measurments is 2.74 eV.
Keyword: α-Fe2O3, annealing, bandgap energy, sol-gel, crystal structure.