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: Kajian komposisi dan struktur tegakan serta pertumbuhan jenis-jenis komersial, khususnya jenis ramin (Gonystylus bancanus (Miq.) Kurz.) di hutan rawa gambut IUPHHK PT Diamond Raya Timber, Propinsi Riau
Abstrak: Raya Timber, Propinsi Riau. Di bawah bimbingan Dr. Ir. Istomo, MS. Dewasa ini, berbagai kegiatan pengelolaan hutan rawa gambut telah dilakukan untuk meningkatkan pemanfaatan hasil hutan dan ekosistemnya. Namun, karena intensitas pemanfaatan hasil hutan yang semakin meningkat, menyebabkan produktivitas hutan dan ekosistemnya semakin menurun, khususnya untuk jenis-jenis komersial yang diusahakan. Salah satu jenis spesifik hutan rawa gambut yang populasinya terus menurun adalah jenis ramin (Gonystylus bancanus (Miq.) Kurz.) yang sejak tahun 2004 telah masuk dalam Appendix II CITES. Oleh karena itu perlu dilakukan penelitian mengenai aspek pertumbuhan untuk memperoleh informasi dasar sehingga dapat meminimalisasi penurunan produktivitas hutan yang mungkin terjadi pada masa yang akan datang, khususnya pada areal IUPHHK PT. Diamond Raya Timber, Propinsi Riau. Salah satu aspek pertumbuhan yang dapat diteliti adalah kajian mengenai komposisi dan pertumbuhan riap dalam suatu habitat tertentu. Penelitian ini bertujuan untuk mengkaji komposisi dan struktur hutan rawa gambut serta pertumbuhan dari jenis komersial, khususnya jenis ramin (Gonystylus bancanus (Miq.) Kurz) hutan rawa gambut 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