Judul: Struktur Tegakan dan Sebaran Jenis Ramin dan Meranti di Hutan Rawa Gambut (Studi Kasus PT. Diamond Raya Timber dan PT. Riau Andalan Pulp And Paper, Provinsi Riau)
Abstrak: Ramin and meranti are recognized as main tree species in peat swamp forest. This study was aimed to determine stand structure and distribution of ramin and meranti, and to determine the existence and growth indicators of ramin and meranti in their natural habitat. The research was conducted in June 2010 at IUPHHK PT Diamond Raya Timber and PT Riau Andalan Pulp and Paper, Riau Province. Stem diameter of trees 10 cm up was recorded using vegetation analysis method in sampling plots size of 100 m x 100 m which was divided into sub plot of 25 m x 25 m. The result shows that the total number of tree species is 26 species at IUPHHK PT Diamond Raya Timber and 45 species at PT Riau Andalan Pulp and Paper. However, the abundance of ramin and meranti species is less than 12% from the tree total number growing in the peat swamp forest either at PT Diamond Raya Timber or PT Riau Andalan Pulp and Paper. Both ramin and meranti grow in the uniform pattern in which the distribution patterns of their stand structure did not follow usual form.
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Judul: Penentuan biomassa di atas tanah jenis ramin (Gonystylus bancanus (Miq) Kurz.) di HPH PT. Diamond Raya Timber Propinsi Dati I Riau
Abstrak: Jenis ramin secara dominan tersebar di hutan rawa gambut, seperti di Kalimantan dan Sumatera. Luas kawasan hutan ramin 9% dari luas kawasan hutan di Indonesia (Direktorat Bina Program Kehutanan, 1983). Dilihat besar- nya potensi ramin di Indonesia, maka diperlukan perenca- naan yang cermat dalam mengelola hutan, sehingga dapat diperoleh hasil yang optimal, serta tetap dapat menjamin kelestarian baik kelestarian hasil maupun kelestarian lingkungan dan usaha. Studi biomassa ini merupakan langkah awal dari studi produktivitas dan sangat penting dipelajari untuk mengeta- hui siklus hara dan aliran energi. Studi biomassa secara global dapat dibagi menjadi dua bagian, yaitu biomassa diatas tanah (Above Ground Biomass) dan biomassa di bawah. permukaan tanah (Below Ground Biomass). Dari segi manajemen hutan, biomassa hutan sangat penting dalam tahap perencanaan pengusahaan hutan, karena keseluruhan kegiatan operasional pengelolaan hutan sangat dipengaruhi oleh besarnya biomassa atau potensi hutan (Kusmana, 1993). Tujuan penelitian ini adalah menentukan biomassa tiap bagian pohon ramin, biomassa di atas tanah seluruh pohon ramin yang berdiameter ≥ 10 cm dan rata-rata biomassa di atas tanah pohon ramin per hektar. Dari data biomassa tersebut dapat diketahui biomassa yang dimanfaatkan (kayu) dan biomassa yang ditinggalkan (limbah) dan biomassa keseluruhan pohon (kecuali akar). Penelitian ini dilaksanakan di HPH PT. Diamond Raya Timber propinsi Riau....
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Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity