Judul: Tabel volume lokal pohon sengon (Paraserianthes falcataria) di Kebun Glantangan Jember, PTPN XII Jawa Timur
Abstrak: Paraserianthes falcataria known as sengon is one of fast growing spesies for industrial forest plantation in Indonesia. The objective of this research was to estimate volume of certain trees in a forest stand. The tree dimension that used was diameter at breast high (dbh) on 120 sample trees that were selected using purposive sampling technique. The estimation of trees volume was based on measurement of fallen trees. The result of the research showed that the best model fit to criteria of model determination: cofficient of determination (R2), standard error, and Ftest, was V = - 0,193 + 0,0170D + 0,00032D2 with R2 values of 98,4% and standard error was 0,023. The accuracy of the regression model was qualified due to RMSE value of 11,25%.
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Judul: Penyusunan Tabel Volume Pohon di Areal IUPHHK PT. Suka Jaya Makmur Kabupaten Ketapang, Kalimatan Barat.
Abstrak: Volume table is a tool of forest inventory to estimate the volume of trees. The objectives of this research are to obtain the volume tables and tested five different types of tree species to be grouped through analysis of covariance. The five types are: meranti merah (S. parvifolia), keruing (Dipterocarpus elongatus), ubar (Euginia Spp.), medang (Litsea firma Hook.f), and jabon (Anthocephalus cadamba). Equation for each spesies are meranti merah (S. parvifolia) logVa=-3.86+2.53logX1, keruing (Dipterocarpus elongatus) logVa=-3.75+2.46logX1, Ubar (Euginia Spp.) logVa=-3.91+2.53logX1, medang (Litsea firma Hook.f) logVa=-3.78+2.44logX1, and jabon (Anthocephalus cadamba) logVa=- 2.99+2.03logX1. The five species produce 26 possible groupings species compositions. The results obtained there are four compositions which have value of F ≤ F table. From the value of R²(%), and F-hits from each of the compositions, the groupings species compositions is not necessary
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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