Judul: Sifat anatomi the least known wood species suku Magnoliaceae: Talauma gigantifolia Miq., T. liliifera O. K., T. rubra Miq., dan T. singapurensis Ridl.
Abstrak: INTRODUCTION: Indonesia has 4000 species of trees, but only 400 species of them have been known as commercial timbers. Magnoliaceae is a family which its member has not been much studied yet, except of Aromadendron elegans. Therefore, the objective of this study was to asses the wood properties of Talauma gigantifolia, T. liliifera, T. rubra and T. singapurensis, macroscopicand microscopically, and then compared them to the property of A. elegans’ wood. These four species of Talauma spp. were expected to be a better substitution of A. elegans which has been commonly used for construction and furniture manufacturing. In this study, the authentic wood samples collection of Xylarium Bogoriensis 1915 of Research and Development Center of Forest Engineering and Forest Products Processing, Bogor were used as the sample. Each species was represented by small portion of their heartwood. METHODS: Macroscopic characteristic namely wood color, figure, texture and grain orientation were observed following the method of Martawijaya et al. (1981) stated in Atlas Kayu Indonesia, while its microscopic namely vessel elements, axial and ray parenchyma as well as their fibers were observed by maceration and microtome specimens. Maceration was made following Forest Products Laboratory method, while microtome specimens were produced following Sass’ method (1961)
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Judul: Kajian Struktur Anatomi dan Sifat Fisis Kayu Balik Angin (Alphitonia excelsa): A Lesser Known Species from Kalimantan
Abstrak: Scarcity of wood supply for wood industries in Indonesian could be solved by searching several potential of wood species from natural forest. Among them, balik angin (Alphitonia excelsa) is one of the promising species since it belongs to faster grown lesser known wood species and abundant. To promote this species effectively, its anatomical structure and physical properties have to be studied. From the research it was showed that heartwood and sapwood are almost similar in colour (light gray), decorative (“V”-type), medium and even textured, straight grain, smooth, lustrous, medium hardness and odourless. Microscopic characteristics are 1, 4, 7, 9, 10, 13, 22, 30, 44, 47, 53, 56, 61, 65, 66, 69, 78, 79, 93, 97, 106, 109, 138, 153 and has resin material within the ray parenchyma cells. Average values of fiber length, moisture content, wood density, specific gravity, and MFA were 1042.84 μm, 13.03%, 0.49 g/cm3, 0.43 and 17.1˚, respectively. Fiber quality of this wood belonged to class of II-III with strength class of III.
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Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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