Judul: Persamaan Penduga Volume Pohon Meranti Merah (Shorea stenoptera Burck.) di KHDTK Haurbentes, Kabupaten Bogor, Provinsi Jawa Barat
Abstrak: Informasi mengenai tegakan hutan akan digunakan dalam menentukan tindakan pengelolaan hutan yang cermat dan terarah. Informasi tersebut bisa diperoleh dari kegiatan inventarisasi, yaitu kegiatan pengumpulan data dan informasi tentang potensi sumberdaya hutan. Tabel volume merupakan alat bantu inventarisasi yang digunakan dalam menduga volume pohon. Ketersediaan tabel volume pohon dalam menduga volume pohon berdiri akan lebih memudahkan kegiatan inventarisasi hutan. Tujuan penelitian ini adalah untuk mendapatkan tabel volume lokal jenis Meranti merah (Shorea stenoptera Burck.) pada areal KHDTK Haurbentes, Provinsi Jawa Barat. Adapun tabel volume yang dibuat adalah tabel volume lokal dengan diameter setinggi dada (dbh) sebagai peubah bebasnya. Terdapat tiga model yang akan digunakan dalam penyusunan tabel volume. Dari ketiga model tersebut akan dipilih satu model terbaik berdasarkan kriteria uji statistik yaitu simpangan baku (s), koefisien determinasi (R²), analisa keragaman, bias, simpangan agregat (SA), simpangan rata-rata (SR), akar rata-rata kuadrat simpangan (RMSE), dan uji beda rata-rata khi-kuadrat (x2). Dari kriteria tersebut, persamaan Berkhout V = 0,000234423 Dbh237 merupakan persamaan terbaik dalam menduga volume pohon Meranti merah (Shorea stenoptera Burck.) dengan nilai s = 0,053, R2 = 99,1%, Fhitung = 7572,42, bias 0,098, SA 0,082, SR = 12,29%, RMSE = 18,22%, dan x² = 0,968. Kata kunci: tabel volume, persamaan berkhout, Meranti merah, Haurbentes
Keyword: Tabel volume, Ppersamaan berkhout, Meranti merah, Haurbentes

Judul: Tabel Volume Meranti Merah (Shorea leprosula Miq) dan Meranti Kuning (Shorea multiflora Miq) di Areal IUPHHK Provinsi Kalimantan Tengah
Abstrak: Red meranti (Shorea leprosula Miq) and yellow meranti (Shore multiflora Miq) volume table is made for increased the volume estimation of each species. There are 87 trees in site as sample. The regression model is made by consists of six equation, three equation using diameter as only one independent variable and three other equation is using two independent variable that is diameter and trees height. Best model is chosen based on coefficient of determination (R2), standard deviation of error (SDE), root mean square of error (RMSE), and bias value. The result showed that equation of model used is V = -5.96 + 0.167 D - 0.000031D^2 with the value of determination coefficient (R2) is 0.81.
Keyword: yellow meranti, volume table, red meranti, Bogor Agricultural University (IPB)

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