Judul: The Local Volume Table Construction at IUPHHK-HA PT. Mamberamo Alasmandiri Work Area, Papua Province.
Abstrak: Untuk menyusun rencana pengelolaan hutan diperlukan data hasil inventarisasi hutan yang akurat. Keakuratan hasil inventarisasi hutan tergantung kepada beberapa hal, salah satunya adalah tersedianya tabel volume pohon untuk menduga volume pohon berdiri. Tabel volume pohon dibuat berdasarkan persamaan atau model matematis. Penelitian ini bertujuan untuk menyusun tabel volume pohon jenis Pometia pinnata di areal kerja IUPHHK-HA PT. Mamberamo Alasmandiri, Provinsi Papua. Adapun jenis tabel volume pohon yang dibuat adalah tabel volume pohon lokal dengan diameter pohon sebagai peubah bebasnya. Model penduga volume pohon disusun dalam 3 bentuk persamaan regresi dengan diameter sebagai peubah bebas. Model terbaik diperoleh berdasarkan kriteria uji statistik untuk keterandalan dan keabsahan model, yaitu koefisien determinasi (R²), simpangan baku (s), analisa keragaman, akar rata-rata kuadrat simpangan (RMSE), bias, simpangan rata-rata (SR), simpangan agregat (SA), dan uji beda rata-rata khi-kuadrat (χ²). Berdasarkan kriteria tersebut, model penduga volume matoa terbaik adalah V= dengan nilai R² = 97,8%, s = 0,082, Fhitung = 4753,55, RMSE = 30%, bias = 12%, SR = 21%, SA = 13,5%, dan χ²=6,115.
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Judul: Penyusunan Tabel Volume Lokal Jenis Merbau (Intsia spp.) di Areal Kerja IUPHHK-HA PT. Arfak Indra Kabupaten Fakfak Provinsi Papua Barat
Abstrak: Development of forest management plans required an accurate data and can be obtained quickly in the process of forest inventory. One of tool in forest inventory such as tree volume table made by equation and a mathematical model that describe relation between tree volume and pridictor variables. The purpose of this research is to develop tree volume table of Merbau (Intsia spp.). The local volume table can be applied in working area of IUPHHK-HA PT Arfak Indra, West Papua and only as well as other location that have some habitat conditions. This research tried three alternatives of mathematical models, such as Berkhout, Kopezky and Gehrhardt Horenald-Krenn model. The criterias of model selection is Standard Deviation (s), Coefficient of Determination (R2), Standard Deviation Aggregate (SA), Average Standard Deviation (SR), Root Mean Square Error (RMSE), and Predicted Residual of Sum Square (PRESS). The best estimate equation model is Berkhout equation. The Berkhout equation model is V = 0.00025 dbh2.33 with the values of s = 0.071, R2 = 97.5%, SA = -0.0240, SR = 13%, RMSE = 18%, PRESS = 0.514402.
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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