Judul: Analisis Hubungan Kadar Karbon dengan Berat Jenis Kayu Jati (Tectona grandis L. f.)
Abstrak: One of the environmental issues associated with forest is climate changing due to global warming caused by rising of greenhouse gases, such as carbon dioxide (CO2). Forests absorb carbon dioxide during the process of photosynthesis. The less number of forest caused less carbon dioxide absorbed and more carbon dioxide can thicken the blanket of greenhouse gases in atmosphere. Reforestation and afforestation were done in order to reduce the green house effect. Teak (Tectona grandis L. f.) belonged the kind of hardwood. Teak also has ability to hold the top soil, prevent the erosion, absorb CO2 from the air and it has a high economic value. The research was conducted at the KPH Balapulang Perhutani Unit I Central Java. The purpose of this study was to determine the relationship between levels of carbon with density found in teak (Tectona grandis L. f.). The sample of trees is selected based on class of age, namely (1) the diameter distribution it’s age classes, (2) the sample of tree must be healthy and the form are normal, and (3) sample of trees should represent average conditions of Teak trees in age classes concerned. Laboratory test was conducted to determine the specific weight and carbon content on any part of the tree. The equation which is obtained based on the regression results are used to determine the closeness relationship between the carbon content and the density of the wood teak (Tectona grandis L. f.). The results showed that there was a significant difference in the value of the carbon content and density in each part of the tree. The greatest density has found in the roots and the largest carbon content has presented in the trunk. The closeness equation between carbon content and wood density formulated in 𝑌=112,20𝑋10,41𝑋2−0,09.
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Judul: Persamaan Alometrik Biomassa dan Massa Karbon Akar Pohon Jati (Tectona grandis Linn f.) di KPH Balapulang, Kabupaten Tegal, Jawa Tengah
Abstrak: Global warming isa phenomenon where the global temperature is increasing due to the green house effect (GHE) resulted from the increase in GHE emission in the atmosphere. Forests play an important role in climate change issues, especially for absorbing CO2 gas from the atmosphere. Tectona grandis Linn. f, known as jati (teak) in Indonesia, is the kind of wood which economically has a high value and is in high demand. Teak is mostly grown on Java Island; therefore, it is necessary to find out the biomass and carbon mass. The carbon is stored in the stem, branch, twig, leaf, and root. Out of the five parts, the hardest is to estimate biomass and carbon mass in root because it is located in the ground and has unreachable root branches, so that it takes a longer time and much money to count biomass and carbon mass in root. After learning the relation model of alometric equation of biomass and carbon mass in root, it is expected that the model can be used to estimate biomass and carbon mass in a tree without having to dig the root. The equation models of alometric biomass in teak root in this study showed that: the relation between root biomass and total tree biomass above ground was BA= 0,221BT0,936, the relation between root biomass and stem biomass was BA= 0,489BU0,842, and the relation between root biomass and the biomass of branch and twig was BA=1,448BC1,21, therelation between root biomass and leaf biomass was BA= 5,977BD1,25. The equation models of alometric carbon mass in teak root in relation with the carbon mass in the tree parts were as follows: root carbon mass and total tree carbon mass above ground was MA= 0,2033MT0,947, root carbon mass and stem carbon mass was MA= 0,430MB0,853, root carbon mass and the carbon mass of branch and twig was MA= 1,448MC1,22, and root carbon mass and leaf carbon mass was MA= 5,977MD1,28. Based on the models, the best model for estimating teak root biomass was BA= 0,221BT0,936 and the best model for estimating the carbon mass of teak root was MA= 0,2033MT0,947.
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Judul: Infeksin virus rota pada anak babi
Abstrak: Virus Rota sudah lama diduga sebagai salah satu penyebab diare pada anak babi yang baru dilahirkan. Hal ini diperkuat dengan berhasilnya Mebus dan kawan-kawan mengidentifikasi virus Rota pada kejadian diare yang ter jadi pada anak sapi yang baru dilahirkan. Infeksi virus Rota merupakan hal yang serius, kejadian yang mewabah pernah dilaporkan di Amerika Serikat, Inggris, Kanada dan Australia. Sedangkan kejadian di Indonesia yang dihubungkan dengan infeksi virus Rota belum dilaporkan. Virus Rota termasuk keluarga Reo viridea. Sesuai dengan namanya, virus Rota menyerupai roda (Rota = Wheel), mengandung asam nukleat (nucleid acid) yang berupa asam nukleat ribo (ribo nucleid acid, RNA) dan berserabut ganda (double stranded), tidak mempunyai selubung (envelop atau peplos). Hewan rentan adalah hewan yang berumur sangat muda. Selain menyerang babi, dapat pula menyerang sapi, domba, rusa, anjing, kucing, tikus, kelinci, unggas dan manusia. ...
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