Judul: Diversity and Ecology of Hoya spp. in Dramaga IPB Campus Area
Abstrak: Hoya merupakan tumbuhan epifit anggota famili Apocynaceae. Hoya memiliki potensi pemanfaatan yang luas. Namun saat ini habitatnya semakin berkurang, sehingga memerlukan program konservasi untuk menjaga kelestariannya di alam. Kawasan kampus IPB Dramaga memiliki keanekaragaman tumbuhan pohon yang bervariasi serta kondisi lingkungan yang ideal untuk pertumbuhan Hoya memungkinkan untuk mengoleksi data dasar yang diperlukan dalam usaha konservasi Hoya. Penelitian ini bertujuan mengidentifikasi keanekaragaman spesies Hoya yang tumbuh di kawasan kampus IPB Dramaga dan menganalisis faktor lingkungan yang mempengaruhi keberadaan Hoya. Lokasi pengambilan data keanekaragaman dan ekologi ditentukan dengan metode jelajah dan purposive sampling. Hoya yang ditemukan diidentifikasi dan dikelompokkan serta dianalisis menggunakan Indeks diversitas Shannon-Wiener dan Indeks Nilai Penting. Faktor-faktor lingkungan yang mempengaruhi keberadaan Hoya dianalisis menggunakan Principal Component Analysis. Sebanyak lima spesies Hoya tumbuh pada 13 spesies pohon inang yang ditemukan di kawasan kampus IPB Dramaga. Spesies Hoya yang mendominasi adalah Hoya purpureofusca (66,20%) dan Hoya carnosa (63,85%). Hoya paling banyak ditemukan tumbuh pada pohon Averrhoa carambola. Hoya di kawasan kampus IPB Dramaga termasuk keanekaragaman rendah. Faktor lingkungan yang diukur tidak mempengaruhi keberadaan dari spesies Hoya yag ditemukan, Hoya is an epiphytic plant belonging to the Apocynaceae family. Hoya has the wide potential use. Still, its habitat is currently decreasing, so it requires a conservation program to maintain its sustainability in nature. The Dramaga IPB campus area has a high diversity of trees and ideal environmental conditions for Hoya growth, making it possible to collect primary data for Hoya conservation efforts. This study aimed to identify the diversity of Hoya species in the Dramaga IPB campus area and analyze the environmental factors that influence the presence of Hoya. The location for collecting data on diversity and ecology was determined by an exploration and purposive sampling method. The Hoya found were identified, grouped, and analyzed using the Shannon-Wiener diversity index and importance value index. Environmental factors that influence the existence of Hoya are analyzed using Principal Component Analysis. Five Hoya species grow on 13 host tree species found in the Dramaga IPB campus area. The dominant Hoya species are Hoya purpureofusca (66,20%) and Hoya carnosa (63,85%). Hoya is commonly found growing on Averrhoa carambola tree. Hoya in the Dramaga IPB campus area is included in low diversity. The environmental factors The environmental factors measured did not influence the existence of the Hoya species.
Keyword: consevation, diversity, environment, epiphyte, phorophyte

Judul: Keanekaragaman Spesies Tumbuhan Langka dan Sebarannya di Kampus IPB Darmaga
Abstrak: Various vegetation cover in IPB Darmaga Campus makes this place has plenty kinds of plants including naturally and wildly grown plants. Some of the plants are included as rare plants species. The rare plants species are potential to be utilized as media for conservation education. However, there’s no research yet about those rare plants and its distribution in IPB Darmaga Campus. The purpose of this research was to identify, determine the distribution, and document the history of rare plants species in IPB Darmaga Campus. Based on this research, there were 30 rare plants species from 18 families. Dipterocarpaceae was recorded as the dominating family. These rare plants species were dominated by tree habitus and were distributed in the whole area of IPB Darmaga, but mostly found in Faculty of Forestry area. These species were mostly planted by lecturers and alumni of Faculty of Forestry, Bogor Agricultural University (IPB). The purpose is for collection and student learning media.
Keyword: Bogor Agricultural University (IPB), rare plants species, IPB Darmaga Campus, conservation education

Judul: Aplikasi Puffing Gun dan Metode Ayakan Getar (Vibrating Mesh) Dalam Proses Pembuatan Berondong Beras dan Berondong Ketan Butiran Berlapis Gula
Abstrak: Puffing rice and puffed glutinous rice are the traditional snack commonly available in the market. The objectives of this research are, first, to determine the puffing time when using a puffing gun to puff the rice/glutinous rice grains. Second, to know the effect of moisture content of the grains to the physical properties of puffed rice and puffed glutinous rice. The next objective is to design a product of sugar coated puffed rice and puffed glutinous rice granules. The materials used were rice and glutinous rice and were conditioned to the moisture content of 14, 16, 18, and 20% wb. The quality parameters used were water losses, hardness, specific volume, and an organoleptic test for the preference. Puffed rice which has been puffed using the puffing gun then were coated with melted of sugar granules in a ratio of 1:1 (w/w), and then were vibrated using a vibrating mesh with 80 mm, 90 mm, and 100 mm amplitude. This process is carried out for 5 minutes, 10 minutes, and 15 minutes. Results show that the moisture content the rice/glutinous rice grains significantly affect the puffing time, water losses, hardness, specific volume, and even the organoleptic preferences of the puffed rice/glutinous rice. Glutinous rice grain with 14% moisture content is the most preferred in terms of flavor, crispy, color, specific volume, texture, and taste. Vibration using amplitude 90 mm in 15 minutes is successfully can be used to produce sugar coated puffed rice granules.
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