Judul: Respon Pohon Gaharu dan Reaksi Hipersensitif Tembakau Terhadap Elisitor Acremonium spp. dan Fusarium spp. Asal Gaharu
Abstrak: This research was carried out to investigate the effectiveness of Acremonium spp. and Fusarium spp. biomass in inducing agarwood formation and the effectiveness of the cell wall elicitor (CWE), conidia elicitor (CE), and crude filtrate elicitor (CFE) of Acremonium spp. (IPBCC 07.525, 07.526, 07.566) and Fusarium spp. (IPBCC 09.568, 09.569, 09.570, 09.571) in inducing the hypersensitivity response of tobacco leaves. Biomass of Acremonium spp. and Fusarium spp. were grown on PDA medium for 14 days and used as inoculant on Gyrinops verstegii branch. All Elicitors were derived from the 12 days Acremonium spp. and Fusarium spp. culture in PDB medium. Agarwood formation was determined by score system (0-10) and classified into three categories based on the average score of each three respondents observation. Acremonium sp. IPBCC 07.526, 07.566, and Fusarium sp. IPBCC 09.571 induced agarwood formation with scores 2,67, 2,89, and 2,78, respectively at 14 days after inoculation (dai). These agarwood were in category 2. Hypersensitive reaction of tobacco leaves (Nicotiana tabacum cv. Gewol) caused by elicitors of all isolates were shown in the necrosis spot with score range of 0,33-1,33 from score system 0-3. All elicitors had the different pathogenicity. The ability of fungi to induce agarwood formation were comparable to hypersensitivity reaction caused by those elicitors. The correlation of agarwood formation by Acremonium sp. IPBCC 07.526, 07.566, Fusarium sp. 09.571 with hypersensitive reaction of their EDS, EK, EFK was positive, high, and significant with correlation coefficient (r) values respectively were 0,831, 0,884, 0,884.
Keyword: 

Judul: Studi interaksi Fusarium sp. dengan pohon gaharu (Aquilaria sp.) menggunakan pendekatan sitologi
Abstrak: The research is aiming to study the pathogenesis mechanism of Fusarium sp. IPBCC. 08.569 on Aquilaria sp. seedling in respect to the respons of the host towards Fusarium sp. IPBCC. 08.569 infection. Penetration mechanism was determined by observing the appresorium formation on the bark surface in vitro, the potency to produce lignocellulase and toxin. While colonization was studied by histopathological methods using both staining process and SEM. The respons of the tree towards infection was observed at either cellular by histochemestry or organ level using scoring system. Fusarium sp. IPBCC. 08.569 showed no appresorium formation but had lignocellulolytic activity. Hypersensitivity reaction of tobacco leaf towards crude extract of extracellular substance indicated that Fusarium sp. IPBCC. 08.569 produce toxin. Direct penetration into the bark was not found, therefore penetration had to be through wounded area. While modification of hyphae was observed in the living cells of the wood tissue (parenchyma rays, included phloem, and pith) these cells might contain terpenoid as conversion of starch. These cellular changes might be observed as discolored wood and the wood became scented. Discolored wood was extended outside the colonization area, indicated that the dark substance might be part of hypersensitive respons to delimit the infection. Using scoring system, after inoculation Fusarium sp. IPBCC. 08.569 can be stated as wound infection fungi with limited colonization in living tissue and induce terpenoid formation in certain tissue.
Keyword: 

Judul: Penyelesaian Masalah Rotasi Aliran Fluida Kental Von Karman Menggunakan Metode Homotopi
Abstrak: Von Karman equation is an equation that describes fluid viscous flow induced by infinite disk rotation. By assuming steady flow and laminar, viscous incompressible fluid flow is represented in Von Karman equation by an angular velocity and the vertical direction velocity as the independent variables. Von Karman equation is a nonlinear problem that is solved using the homotopy method. The use of homotopy method is done by defining an homotopy function that requires auxiliary parameters to control the convergent region of the solution. The solution is a recursive formula with given initial conditions. Using software based-functional shows that velocity components converge to a value.
Keyword: