Judul: Penyusunan Tabel Volume Lokal Jenis Nyatoh (Palaquium spp.) di IUPHHK-HA PT. Mamberamo Alasmandiri, Provinsi Papua.
Abstrak: Forest inventory is activities to know and obtain data along information about resources, potential values, and full of environments . The main objective of forest inventory activities is getting data about the condition of timber standing stock. To help forest inventory activities is needed supporting tools to facilitated this measurement and as well as to reduce human error that include tree’s volume table. PT. Mamberamo Alasmandiri have a heterogeneous diversity of tree’s species, one of them is nyatoh (Palaquium spp.). The main objective of this research is to establish local volume table nyatoh (Palaquium spp.). The volume table model using 150 trees that have been felled, selected by purpossive sampling. The regression equation that used including Berkhout equation, Kopezky- Gehrhardt, and Horenald-Krenn. Some of test that used for selecting the best model are analysis of variance, residual analysis, and outlier analysis. Validation model using Jacknife Procedures base on predicted residual sum of square (PRESS) value. The criteria used for selecting the best model is coefficient of determination (R²), adjusted coefficient of determination (Ra²), standard deviation (s), aggregate deviation (SA), average deviation (SR) and RMSE. The best model of nyatoh (Palaquium spp.) in IUPHHK-HA PT. Mamberamo Alasmandiri is V = 0,000158 Dbh2,48.
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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: 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