Judul: Keanekaragaman Oxydothis Penz. & Sacc. (Fungi, Xylariales) pada Palem-paleman (Arecaceae) di Kebun Raya Bogor
Abstrak: Palm (Arecaceae) is monocotyledonous plant and widely distributed worldwide. Oxydothis Penz. & Sacc. is a fungal genus belonging to phylum Ascomycota. Bogor Botanical Garden (KRB) is well-known as one of important ex-situ conservation of tropical plants, especially in Indonesia. This study was aimed at examining the diversity of Oxydothis associated with palms in KRB. Decaying fronds from Arecaceae sites with black, gray, or brown spot on the surface were collected. Asci, ascal ring, and ascospores were observed in shears medium, and Melzer reagent was used to see the amyloid reaction of ascal ring. A total 16 species were identified as follow: O. angustispora J. Fröhl. & K.D. Hyde, O. asymmetrica J. Fröhl. & K.D. Hyde, O. batuapoiensis J. Fröhl. & K.D. Hyde, O. belalongensis J. Fröhl. & K.D. Hyde, O. daemonoropsicola J. Fröhl. & K.D. Hyde, O. dispariapicis J. Fröhl. & K.D. Hyde, O. elaeicola Petr., O. extensa J. Fröhl. & K.D. Hyde, O. grisea Penz. & Sacc., O. hoehnelii (Rehm.) Sacc., O. hongkongensis J. Fröhl. & K.D. Hyde, O. licualicola J. Fröhl. & K.D. Hyde, O. nonspecifica J. Fröhl. & K.D. Hyde, O. rattanica J. Fröhl. & K.D. Hyde., O. rattanicola J. Fröhl. & K.D. Hyde, and O. rimicolla J. Fröhl. & K.D. Hyde.
Keyword: Arecaceae, Ascomycota, diversity, Bogor Botanical Garden, Xylariales

Judul: Keragaman dan Jumlah Kelompok Acari Tanah pada Kebun Kelapa Sawit di PTPN VIII Cikasungka Kabupaten Bogor
Abstrak: Oilpalm is one of the plantation commodities which have an important role in generating foreign exchange through the production of palm oil and palm kernel oil. Development of oil palm plantation in Indonesia is supported by the large areal potency, tropical climate and suitable soil. Oilpalm can grow at pH 4,0-6,0, but the optimum pH is between 5,0-5,6. Suitable pH associated with the decomposition process in ecosystems where these plants live. Soil mesofauna is one of components of the soil ecosystem. Its existence and activity in the soil can affect soil fertility. One of soil mesofauna that can be found abundantly is soil acari. Most members of the acari live in soil as well as on the soil surface. Acari has a body length between 0,1 mm to 2,0 mm. Acari body color ranging from light brown to black with varies body shapes. Acari body size will become smaller following to the depth of the soil where they lived. The objective of this study was to determine the soil acari diversity and abundance at area of palm oil productive plants (TM) and immature palm oil plants (TBM). Method of research was extraction of animal from the soil samples using Kempson Extractor, then the soil fauna especially acari was identified using a stereo microscope. Generally, three sub-orders were obtained in each area, namely suborder Oribatida, Gamazina and Uropodina. Results showed the average population of acari from TM area was 2880±1089 individuals m-2, the average population of soil acari from TBM area was 1218±392 individuals m-2. Sub order Oribatida most often found in TBM and TM, as well. From the result, it could be concluded that the older age of the plant, acari population was found to be higher, because the older plant was producing more litter than the younger plants, so it could increase population of soil microbes. Correspondence analysis showed that Gamazina affected by soil properties, pH, Cu, C-organic, N, K, KA, Zn, and Ca.
Keyword: Bogor Agricultural University (IPB), immature palm oil plants, palm oil producing plants, soil mesofauna

Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa