Judul: Anatomi Daun Beberapa Spesies Anggota Araceae di Kampus IPB Dramaga, Bogor
Abstrak: Araceae merupakan salah satu famili terbesar dari kelompok Monokot sehingga mudah ditemui di berbagai belahan dunia, khususnya di negara beriklim tropis. Indonesia merupakan habitat bagi 36 genus Araceae. Penelitian ini bertujuan mempelajari karakteristik anatomi daun beberapa spesies Araceae yang ditemukan di sekitar Kampus IPB Dramaga, Bogor. Dua helai daun diambil dari tiap individu pada tiga ulangan tanaman Aglaonema commutatum, Philodendron burle-marxii, Spathiphyllum wallisii, Syngonium auritum, dan Xanthosoma sagittifolium. Daun tersebut dibuat sediaan mikroskopis berupa sayatan paradermal. Karakter anatomi yang diamati ialah bentuk sel epidermis, tipe, ukuran, kerapatan, dan indeks stomata. Hasil pengamatan menunjukkan bahwa A. commutatum dan S. wallisii memiliki epidermis berbentuk poligonal dengan dinding antiklinal berlekuk, sedangkan P. burle-marxii, S. auritum, dan X. sagittifolium memiliki epidermis berbentuk poligonal dengan dinding antiklinal lurus. Daun bertipe hipostomatik hanya dimiliki oleh P. burle-marxii. Stomata brachyparacytic dijumpai di kedua sisi daun A. commutatum, S. wallisii, S. auritum, dan X. sagittifolium, sementara stomata brachyparahexacytic monopolar dijumpai di sisi abaksial P. burle-marxii dan S. auritum. Aglaonema commutatum merupakan spesies dengan stomata terbesar dan kerapatan stomata terendah. Syngonium auritum merupakan spesies dengan stomata terkecil dan kerapatan stomata tertinggi serta indeks stomata terendah. Spathiphyllum wallisii merupakan spesies dengan indeks stomata tertinggi.
Keyword: Araceae, brachyparacytic, brachyparahexacytic monopolar, epidermis, stomata

Judul: Keanekaragaman Famili Asteraceae di Kawasan Kampus IPB Darmaga, Bogar
Abstrak: Asteraceae is the second larger family after Leguminosae. The diversity of species in this family could be assessed by morphological and anatomical characters. This research aims to study the diversity of family Asteraceae in Campus Area of IPB Darmaga, Bogor by describing their morphological character and anatomical character of stomata and trichome. Sampling was conducted in 12 locations in the area of green space by using the methode of exploration. Type of stomata and trichome were observed using whole mount method. The family of Asteraceae were found as many as 26 species, belonging to 24 genera and 8 tribe. Tricomes of family Asteraceae are unicellular glandular trichome, multicellular glandular trichome, and multicellular non glandular trichome. The most often found trichome was multicellular non glandular trichome. The type of stomata of observed species are anomocytic
Keyword: Bogor Agricultural University (IPB), type of trichome., type of stomata, whole mount, exploration, Asteraceae

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model