Judul: Populasi Nematoda Parasit Pada Kumbang Elaedobius kamerunicus Faust.
Abstrak: Parasitism is a close interaction between two organisms that are detrimental to either party. Weevil Elaedobius kamerunicus is a pollinator of oil palm (Elaeis guineensis Jacq.). One of the parasite of the weevil is nematode. The aims of the research was to study population of parasitic nematode in E. kamerunicus at Cikidang, Sukabumi, and Cimulang, Bogor plantations of PTPN VIII. The research was conducted in June 2010-January 2011. Weevils were collected from male flower of oil palms. Samples of nematode were identified and counted. Parasitic nematode species found in the E. kamerunicus was Elaeonchus partenonema. Populations of E. partenonema were highest in wet season, that were in October (Cikidang, Sukabumi) and November (Cimulang, Bogor). Rainfall has a highest impact on nematode parasite population among parameters measured.
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Judul: Populasi kumbang Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) sebagai penyerbuk tanaman kelapa sawit (Elaeis guineensis Jacq.) di Kumai, Kalimantan Tengah
Abstrak: Elaeidobius kamerunicus is the effective pollinators of oil palm plants. The weevil is monophagous and complete their life cycle in male inflorescences of oil palm. Pollinating by the weevils increase oil palm productivity. This research aimed to observe weevil population and the relationship between environment factors and the weevil population. This research consist of observing morphological of weevil, estimating the population with counting the weevil on male inflorescences, and measuring the environment factors in the field. Relationship between environment factors and the weevil population were analyzed by CANOCO 4.0. High population of the weevil occurred in July and low in October. Population size of the weevil was above the minimum population for effective pollination. Weevil population on the field related to the number of spikelet of male inflorescences. Rainfall and temperature were negatively affect to the weevil population.
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Judul: Struktur Kristal dan Sifat Optik Lapisan Tipis Ba0.55Sr0.45TiO3 didadah Litium Oksida dengan Metode Chemical Solution Deposition
Abstrak: Telah dilakukan penumbuhan film tipis Barium Strontium Titanat (Ba0.55Sr0.45TiO3) murni dan BST yang didadah Litium Oksida Li2O (BSLT) dengan variasi pendadah 0%, 1%, 3% dan 5% di atas substrat Si(111) tipe-p dengan menggunakan metode Chemical Solution Deposition (CSD) dengan teknik spin coating pada kecepatan putar 3000 rpm selama 30 detik. Film Tipis BST dibuat dengan konsentrasi 1M dan annealing pada suhu 850°C untuk substrat Si(111). Hasil karakterisasi menggunakan XRD diuraikan dalam bentuk grafik hubungan antara intensitas terhadap sudut 2 theta. Pola difraksi XRD Ba0.55Sr0.45TiO3 diketahui memiliki beberapa puncak. Material Ba0.55Sr0.45TiO3 berbentuk kristalin dengan struktur kubus, dengan besar parameter kisi 4.061 Å. Hasil uji sifat optik menunjukkan bahwa pendadahan mempengaruhi nilai energy gap BST dan semakin besar komposisi litium (Li) yang digunakan maka semakin besar indeks bias yang dihasilkan. Pendadahan Li2O menaikkan konstanta dielektrik film.
Keyword: BST, Li2O, energy gap, sifat optik, struktur kristal