Judul: Identifikasi dan karakterisasi struktur sarang lebah Trigona (Hymenoptera: Apidae) di Bogor
Abstrak: Trigona is one genus in the social insect group. This stingless bees belong to the family of Apidae and has cavity nest. Trigona build the complex structure nest in different shapes cavities. The aims of this research were to identify the species of Trigona in Bogor and to characterize the nest structure, and the storage pots and brood combs shape, colour, size and their connections. Identification of Trigona were based on characters in hind tibia and body colour. Nest observations were carried out for the nest structure, and the storage pots and brood comb size, shape, the connections, arrangement, and colour. The identified bees were T. laeviceps. Trigona laeviceps has hind tibia length less than 2 mm, body predominantly black, forewing rather uniformly transparent, mandibula with two weak teeth, scutellum large with mesoscutellum projecting backward exceeding posterior slope of propodeum. The arrangement of nest structure from entrance to inner nest was entrance tube, batumen, involucrum, storage pot, brood comb, storage pot again. Structure and components of the nest were depend on the cavities shape. Storage pots, brood combs, and their connections have diverse shape and colour. Brood combs have relatively the same length compare to the storage pots.
Keyword: Bogor Agricultural University (IPB), social insects, brood combs colour, storage pots shape, nest structure, Trigona laeviceps

Judul: Morphological Characteristics Of "Teuweul Omas" (Trigona Sp.: Hymenoptera) From West Java
Abstrak: Stingless bees (Meliponini: Apidae) are eusocial insect with a highly organized system. Stingless bees are characterized by complex communication, permanent colonies, and has division of caste (queen, males, and workers). Trigona belong to stingless bees. In this research, we described morphological characteristics of "teuweul omas" (Trigona sp.) collected from Ciomas, Serang, Banten Province. Identification of specimen based on morphological characters and morphometric study, such as body length, characteristics of the head, thorax, wings, and legs. Morphological characteristics of worker “teuweul omas” are 4.445±0.072 mm body length, 1.911±0.019 mm head width, mesoscutum with distinct hair bands (well banded) separated by glabrous interspaces area, with plumose frontal hairs, and black metasoma, legs, and hairs on the frontal. Based on morphological characteristics of the body, "teuweul omas" was grouped in the genus Trigona, subgenus Tetragonula, and iridipennis group.
Keyword: Morphological character, morphometric, stingless bee, Tetragonula

Judul: Epoksida Minyak Jarak Pagar Sebagai Pemlastis Film Polivinil Klorida
Abstrak: Komponen penyusun plastik terdiri atas dua jenis, yaitu komponen utama berupa polimer (resin) yang merupakan komponen terbesar dari bahan plastik dan aditif. Aditif adalah komponen yang sangat penting pada plastik, walaupun hanya dalam jumlah sedikit tidak lebih dari 5%. Aditif digunakan pada plastik untuk meningkatkan sifat fungsionalnya seperti ketahanan terhadap api, kekuatan, dan fleksibilitas. Salah satu zat aditif paling penting adalah pemlastis (plasticizer). Pemlastis menguasai 65% dari 7.5 juta ton pasar zat aditif di dunia yang setara dengan US$7,6 miliar. Kegunaan utama, yaitu sekitar 90%, digunakan untuk polivinil klorida (PVC). Bahan pemlastis ditambahkan pada PVC agar tidak bersifat kaku dan rapuh dan pemlastis terbesar yang digunakan sekarang ini diambil dari kelompok senyawa ftalat (ester turunan dari asam ftalat). Pemlastis jenis ftalat seperti dietilheksil adipat (DEHA), dietilheksil ftalat (DEHP), dan dioktil ftalat (DOP) merupakan pemlastis berbahan dasar minyak bumi (petrokimia) yang dikategorikan berbahaya dan toksik.
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