Judul: Fenologi Pembungaan Pinanga (Palmae) di Kebun Raya Bogor
Abstrak: Pinanga (Palmae) memiliki keragaman jenis yang besar dan tersebar dari Himalaya dan China Selatan hingga Papua New Guinea. Pinanga memiliki beberapa kegunaan yaitu sebagai tanaman hias, obat, dan lain-lain. Penelitian ini bertujuan untuk mendeskripsikan fenologi pembungaan dan serangga pengunjung pada P. coronata, P. celebica, dan P. insignis. Penelitian menggunakan metode deskriptif yang meliputi waktu, tahapan perbungaan, ciri morfologi, faktor lingkungan yang mempengaruhi dan serangga pengunjung. Tahapan perbungaan Pinanga meliputi inisiasi, kuncup menuju antesis, antesis dan penyerbukan. Pada Fase inisiasi terjadi pertambahan ukuran pelepah, daun berwarna kuning dan layu. Fase kuncup menuju antesis ditandai dengan seludang sudah terlihat dan terjadi perubahan kemiringan sudut antara seludang terhadap batang. Fase antesis ditandai dengan terjadinya pemekaran sempurna dari kuncup bunga saat petal membuka sempurna. Fase penyerbukan ditandai dengan bunga jantan sudah mulai rontok dan adanya serangga pengunjung. Pinanga coronata memiliki fase perbungaan paling lama diikuti oleh P. celebica kemudian P. insignis. Lama fase perbungaan dipengaruhi oleh kelembapan, intensitas cahaya, angin dan temperatur lingkungan. Serangga pengunjung yang dominan adalah Trigona sp. Serangga ini paling banyak berkunjung pada jam 09.00-10.00 WIB. Pinanga coronata memiliki rata-rata keberhasilan penyerbukan 91.4%, P. celebica memiliki ratarata keberhasilan penyerbukan 52.5%, P. insignis memiliki keberhasilan penyerbukan 88.95%
Keyword: P. coronata, P. celebica, P. insignis, Bogor Botanic Gardens, P. insiguit

Judul: Fenologi Pembungaan Pinang Yaki (Areca vestiaria Giseke) di Kebun Raya Bogor
Abstrak: One of the palm genus that available widely in Indonesia is Areca. Areca vestiaria is a palm species endemic in Sulawesi which has an unique characteristics and important components in a tropical rainforest. A. vestiaria has many functions, such as, materials for handicrafts, medicinal herb of diabetes, and for male tonic. Based on the benefits, people will continue to use it. Uncontrolled utilization will lead it to extinction. Hence, need of conservation to preserve it. For this reason, it is necessary assess aspects of flowering phenology of A. vestiaria. Samples consist of lowland and upland Sulawesi accessions. Parameter of flower phenology consist of period of development flowering time, at each development phase, and the micro-climate factors. Flowering of A. vestiaria includes of initiation, bud towards anthesis, anthesis, and young fruit until maturity. The result showed that in each phase has a different time. Overall, the flowering development was not directly affected by a particular micro-climate factors. The insects visitors dominant were Trigona sp. and windspeed was caused high persentage of pollination.
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Judul: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
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