Judul: Dinamika Sporulasi Genus Fungi Mikoriza Arbuskula Hasil Penangkaran Dari Bawah Tegakan Hutan Tanaman Jabon (Anthocephalus cadamba Roxb Miq.)
Abstrak: The degraded land generally is not productive so land reparation is needed, one of them is establishing forest plant. Developed many forest plants are planted forests jabon (Anthocephalus cadamba Roxb Miq.). Arbuscular myccorhizal fungi (AMF) could increase jabon growth besides fertilizing. Information about AMF diversity and sporulation genus in jabon is still limited. Therefore, the study of AMF sporulation genus dynamics of jabon forest plants needs to be done. The method of this research is picking by sampling the soil from jabon rizosfer and culture pot media. The results showed that the spores density in November until Desember were increased and Desember until January were decreased on Sorgum bicolor and Pueraria javanica. AMF genus that found was Glomus, Acaulospora, and Scutellospora with main genus was Glomus. Effective types of host plants for trapping AMF is Sorgum bicolor.
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Judul: Keanekaragaman Fungi Mikoriza Arbuskula di bawah Tegakan Tanaman Agroforestri Jabon (Anthocephalus cadamba Miq.) di Purwakarta, Jawa Barat
Abstrak: Anthocephalus cadamba is a one of tree species from Rubiaceae family that may symbiotic with arbuscular mycorrhizal fungi (AMF). The presence of AMF is very important for the soil nutrient existence, such as P, K, Mg, Fe, and also Mn to increase the growth of plants. The purpose of this research is to identify the diversity of AMF spores under stand of jabon agroforestry plants and to analyze the AMF status on various jabon planting patterns. Spores isolation was taken from soil sample using wet sieving method and decanthing method. Spores from the isolation morfologically identified by observing spores reaction through Melzer’s liquid. The result of this research indicated that soil chemical characteristic on three planting patterns of jabon do not give any concrete effects to the percentage of AMF’s root colonization. There are three genus of AMF found on the research location consist of Glomus sp., Acalauspora sp., and Scutellospora sp. Based on statistical analysis result, the jabon intercropping planting patterns which combining cucumber plants resulting the highest value of both diameter and height growth on various jabon planting patterns.
Keyword: root colonization, planting pattern, arbuscular mycorrhizal fungi

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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