Judul: Respon pertumbuhan Calliandra calothyrsus Meissn. dan Calliandra tetragona Benth. terhadap pemberian Fungi Mikoriza Arbuskula dan arang tempurung kelapa
Abstrak: Penelitian ini menggunakan rancangan petak terbagi (split plot design) dengan pola rancangan acak lengkap yang terdiri dari dua faktor. Faktor FMA sebagai petak utama terdiri dari tiga taraf, arang sebagai anak petak terdiri dari tiga taraf dengan lima kali ulangan pada masing-masing perlakuan. Parameter pertumbuhan semai yang diamati selama duabelas minggu setelah tanam yaitu tinggi, diameter, berat kering akar dan pucuk, nisbah pucuk akar, indeks mutu bibit dan kolonisasi akar. Penelitian ini dilaksanakan di Laboratorium Mikrobiologi Hutan dan rumah kaca Pusat Litbang Konservasi dan Rehabilitasi Gunung Batu Bogor. Hasil penelitian menunjukkan interaksi FMA dan arang terbaik pada semai C. calothyrsus dan C. tetragona terdapat pada perlakuan A2M2 (Gigaspora sp. + arang 20%). Semai C. calothyrsus memiliki peningkatan tinggi, diameter dan berat kering pucuk sebesar 397,07%; 107,03% dan 303,82% terhadap kontrol. Semai C. tetragona memiliki peningkatan berat kering akar dan berat kering pucuk sebesar 258,51% dan 340,17% terhadap kontrol dan memiliki IMB sebesar 0,08. Inokulasi Gigaspora sp. memberikan respon lebih baik dibandingkan dengan Glomus sp. pada kedua jenis semai. Semai C. calothyrsus memiliki peningkatan berat kering akar sebesar 156,35% terhadap kontrol dan memiliki IMB sebesar 0,06. Semai C. tetragona memiliki peningkatan tinggi, diameter dan NPA sebesar 93,48%; 44,19% dan 38,20% terhadap kontrol. Pemberian arang terbaik pada kedua semai terdapat pada taraf arang 10%. Semai C. calothyrsus memiliki IMB sebesar 0,06. Semai C. tetragona memiliki peningkatan tinggi dan diameter sebesar 59,67% dan 68,66% terhadap kontrol. Pemberian arang memberikan efek yang positif pada perkembangan FMA tetapi tidak berbeda nyata dengan tanpa pemberian arang. Kata kunci: arang tempurung kelapa, Calliandra callothyrsus, Calliandra tetragona, fungi mikoriza arbuskula (FMA), pertumbuhan
Keyword: Coconut shells charcoal, Calliandra calothyrsus, Calliandra tetragona, Arbuscular mycorrhizae fungi (AMF), Growth

Judul: Pengaruh penambahan bioaktivator, asam humik dan mikoriza (CMA) terhadap pertumbuhan kaliandra merah (Calliandra calohyrsus)
Abstrak: The aim of study are to determined the effect of application by combined bioactivator and humic acid at different level with or without mycorrhiza on growth and production of Caliiandra calothyrsus. A factorial completely randomized design was applied in this study, which consisted of 2 factors (2x5) and replications, many kind of bioactivator that used in this research are bioenzim and bioc-α. The first factor was mycorrhiza additions (0 and 20 g/polibag) and the second factor was humic acid addition (D0=0 g, D1=5g, D3=7.5 g, D4=10 g). The data were analyzed with analysis of Variance (ANOVA). Duncan Range Test were used if there is any significant effect. The experimental result showed that combination by bioc-α, humic acid and mychorrizae effected significantly vertical length gain, number of branch, stem diameter, total production root dry matter and root infection percentage. Interaction between of bioc-α and 10 gram humic acid with mycorrhiza give the best result to increase growth factor Calliandra calothyrsus.
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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