Judul: Sebaran karang keras (Hard coral) dan karang lunak (Soft coral) di Kepulauan Wakatobi Sulawesai Tenggara
Abstrak: Penelitian ini bertujuan untuk melihat melihat persentase penutupan karang keras (hard coral) dan karang lunak (soft coral) di daerah Taman Nasional Kepulauan Wakatobi pada tahun 2007. Penelitian dilaksanakan pada tanggal 25 November – 10 Desember 2007 dan bersamaan dengan kegiatan Ekspedisi Zooxanthellae IX yang diselenggarakan oleh Fisheries Diving Club – IPB (FDC-IPB). Data penelitian diambil menggunakan metode LIT (Line Intercept Transect). Data yang diperoleh di olah persentase penutupannya, terutama persentase penutupan karang keras (hard coral) dan karang lunak (soft coral). Persentase penutupan tertinggi karang keras di Wakatobi sebesar 73,8% di kedalaman 3 - 6 meter dan terendah sebesar 3,15%. Sedangkan persentase penutupan karang keras tertinggi di kedalaman 7 – 15 meter sebesar 75,17% dan terendah sebesar 3,87%. Penutupan karang keras di Wakatobi termasuk dalam kategori buruk sampai dengan sangat baik. Kondisi buruk terumbu karang di Wakatobi dipengaruhi oleh wabah COT (Crown of Thorn) dan nelayan-nelayan yang tidak mematuhi peraturan baik nelayan lokal maupun dari luar Wakatobi. Penggunaan alat tangkap yang merusak masih banyak digunakan oleh nelayan melakukan kegiatan perikanan di wilayah Kepulauan Wakatobi…
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Spatial Distribution of Benthic Communities in The Kepulauan Seribu Marine National Park, DKI Jakarta
Abstrak: Dalam beberapa dekade terakhir, diketahui bahwa tutupan terumbu karang di Kepulauan Seribu mengalami degradasi akibat dari pengaruh non-antropogenik (perubahan ekologis, faktor alam) dan pengaruh antropogenik (kegiatan manusia) seperti pariwisata dan perikanan tangkap. Taman Nasional Kepulauan Seribu memiliki sistem zona pengelolaan perairan yang berfungsi melindungi ekosistem bahari yang ada di dalamnya seperti ekosistem terumbu karang. Terdapat empat zona perairan yaitu ada zona inti, zona perlindungan, zona pemanfaatan wisata, dan zona pemukiman. Penelitian ini bertujuan mengetahui sebaran komunitas bentik, sebaran lifeform karang keras, dan sebaran genus karang lunak serta persentase tutupannya berdasarkan zonasi di Perairan Taman Nasional Kepulauan Seribu, DKI Jakarta. Metode yang digunakan adalah Underwater Photo Transect dengan ukuran 58 cm x 44 cm. Berdasarkan pengamatan di empat zona perairan tersebut, diketahui bahwa kategori abiotic merupakan yang tertinggi dibandingkan dengan enam kategori lainnya dengan total nilai tutupan berada pada rentang 40 - 50%. Kondisi tutupan karang keras hidup di perairan zona inti, zona pemanfaatan, dan zona pemukiman masuk ke dalam kategori cukup (25 - 49,9%). Adapun tutupan karang keras hidup di perairan zona perlindungan masuk ke dalam kategori buruk (0 - 24,9%). Sebaran genus karang lunak pada zona inti didominasi oleh genus Sarcophyton (0,28%), zona pemanfaatan oleh genus Gorgonian (0,13%), zona pemukiman oleh genus Gorgonian (1,04%), dan zona perlindungan oleh genus Nephthea (0,15%)., In the last few decades, it has been known that coral reef cover in the Kepulauan Seribu has been degraded as a result of non-anthropogenic influences (ecological changes, natural factors) and anthropogenic influences (human activities) such as tourism and capture fisheries. The Kepulauan Seribu Marine National Park has a water management zone system that functions to protect the marine ecosystems in it such as coral reef ecosystems. There are four water zones, namely the core zone, protection zone, tourism utilization zone, and residential zone. This study aims to determine the distribution of benthic communities, distribution of hard coral lifeforms, and distribution of soft coral genera and their percentage of cover based on zoning in the waters of the Kepulauan Seribu Marine National Park, DKI Jakarta. The method used is Underwater Photo Transect with a size of 58 cm x 44 cm. Based on observations in the four water zones, it is known that the abiotic category is the highest compared to the other six categories with a total cover value in the range of 40 - 50%. The condition of living hard coral cover in the waters of the core zone, utilization zone, and settlement zone was in the sufficient category (25 – 49,9%). As for the live hard coral cover in the waters of the protection zone, it is in the bad category (0 – 24,9%). The distribution of soft coral genera in the core zone is dominated by Sarcophyton (0,28%), the utilization zone by Gorgonian (0,13%), the settlement zone by Gorgonian (1,04%), and the protection zone by Nephthea (0,15%) .
Keyword: category, coral, cover, Kepulauan Seribu Marine National Park, zone

Judul: Mathematical model of Hematopoietic Stem Cell in Chronic Myelogenous Leukemia with and without Therapy
Abstrak: Leukemia or blood cancer is a diverse group of neoplastic disease, characterized by the multiplication of abnormal leukocytes or malignant transformation of blood-forming cells in bone marrow and lymphoid tissues. One of the most common types of leukemia is Chronic Myelogenous Leukemia (CML), which is usually diagnosed by the presence of certain chromosomal abnormalities, the so-called Philadelphia chromosome (Ph). One of the treatments of CML is Granulocyte Colony-Stimulating Factor (G-CSF). In this paper, we discuss two Hematopoietic Stem Cell (HSC) models, i.e. HSC without treatment and HSC with G-CSF treatment. The model of HSC without treatment included three equations representing the dynamics of HSC, leukocyte and platelet. Whereas, the model of HSC with G-CSF treatment includes the previous three equations and adds two more equations representing G-CSF injection and G-CSF circulation. The stability behavior of the system approaching the equilibrium points in the simulation study is carried out using Mathematica 7.0. The simulation results show that the G-CSF treatment can successfully decrease the number of HSC, which means reducing the CML.
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