Judul: Serangan Rayap Tanah pada Areal Demplot Uji Keturunan Eucalyptus pellita di Parung Panjang, Bogor, Jawa Barat
Abstrak: Sejak penanaman yaitu bulan Maret 2021 sampai umur delapan bulan, beberapa tanaman Eucalyptus pellita di areal demplot uji keturunan mengalami kematian akibat serangan rayap tanah. Akan tetapi jenis rayap tanah yang menyerang dan berpotensi menyerang belum diketahui secara komprehensif. Penelitian ini bertujuan untuk mengevaluasi frekuensi serangan rayap tanah dan potensi serangannya pada areal demplot uji keturunan E. pellita Kawasan Hutan dengan Tujuan Khusus, Parung Panjang, Bogor, Jawa Barat serta mengidentifikasi spesies rayap tanah yang menyerang kayu umpan. Penelitian dilakukan dengan cara pengumpanan menggunakan kayu pinus (Pinus merkusii) berdasarkan American Society for Testing and Material D 1758-06. Hasil penelitian menunjukkan bahwa, frekuensi kematian tanaman E. pellita di areal demplot mencapai 16,29%, frekuensi serangan rayap terhadap kayu umpan pada areal demplot sebesar 85,45%, dan ratarata kehilangan berat kayu umpan sebesar 32,20%. Rayap yang ditemukan setidaknya ada tiga jenis yaitu Macrotermes gilvus, Microtermes insperatus, dan Shedorhinotermes javanicus.
Keyword: damage intensity, Eucalyptus pellita, Pinus merkusii, termite bait, weight loss

Judul: Serangan Rayap Tanah terhadap Tegakan Pohon di Kebun Raya Bogor
Abstrak: Pelestarian dan perlindungan terhadap pohon-pohon yang tersimpan di Kebun Raya Bogor (KRB) perlu dilakukan untuk menghindari kerusakan oleh berbagai macam penyakit maupun serangga perusak termasuk rayap. Penelitian bertujuan menganalisis frekuensi serangan rayap dan mengidentifikasi jenis rayapnya, menganalisis preferensi rayap terhadap jenis pohon, serta tingkat kerusakan pohon akibat serangan rayap di KRB. Penelitian dilakukan dengan menggunakan metode jalur sampling dengan Intensitas Sampling 20%. Hasil penelitian menunjukkan bahwa sebanyak 213 (100%) pohon contoh di KRB terserang rayap. Spesies rayap tanah yang ditemukan sekurang-kurangnya terdapat empat spesies yaitu Coptotermes curvignathus Holmgren, Macrotermes gilvus Hagen, Odontotermes javanicus Holmgren dan Nasutitermes matangensis Haviland. Rayap M. gilvus banyak ditemukan pada pohon Pterocarpus indicus, Dysoxylum spp., Shorea spp., dan Dimocarpus spp.. Rayap O. javanicus banyak ditemukan pada pohon Vitex cofassus, Dehaasia incrassata, Heritiera spp., dan Cordia spp.. Rayap N. matangensis banyak ditemukan pada pohon Canarium indicum, Dysoyylum spp., dan Sindora spp.. Rayap C. curvignathus banyak ditemukan pada pohon Araucaria columnaris, Agathis sp., dan Pinus spp. Tingkat kerusakan pohon contoh akibat serangan rayap sebesar 10-90%., Preservation and protection of trees stored in the Bogor Botanical Gardens (KRB) need to be done to prevent damage by various kinds of diseases and destructive insects including termites. This study aimed to analyze the frequency of termite attacks and to identify the type of termites, to analyze termite preferences for tree species, as well as the degree of tree damage due to termite attacks in KRB. The research was conducted using the path sampling method with a sampling intensity 20%. The results showed that as many as 213 (100%) sample trees in KRB were attacked by termites. There are at least four subterranean termite species found, namely Coptotermes curvignathus Holmgren, Macrotermes gilvus Hagen, Odontotermes javanicus Holmgren, and Nasutitermes matangensis Haviland. Termites M. gilvus are found in Pterocarpus indicus, Dysoxylum spp., Shorea spp., and Dimocarpus spp. Termites O. javanicus are found in Vitex colossus, Dehaasia incrassata, Heritiera spp., and Cordia spp. Termites N. matangensis is found in Canarium indicum, Dysoxylum spp., and Sindora spp. Termites C. curvignathus can be found in Araucaria columnaris, Agathis sp., and Pinus spp. The level of damage to sample trees due to termite attacks is 10-90%.
Keyword: Attack frequency, subterranean termites, termite preferences, tree health

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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