Judul: Tabel Volume Pohon Jenis Jati (Tectona grandis L.f) Menggunakan Pohon Rebah pada Tegakan Hutan Rakyat (Studi Kasus Hutan Rakyat di Kabupaten Kulon Progo Daerah Istimewa Yogyakarta).
Abstrak: Volume table is an information in table form that consist volume estimate type of tree from parameters itself. Arranging volume tables in private’s forest not only for inventory activities but olso for information for farmers of transaction activity. The abjective of this research are to provide information about how to arrange volume table for readers and provide estimate information of tree volume of Jati (Tectona grandis L.f) accurately for farmers especially for farmers in Regency Kulon Progo’s private forest. Sample that used in this research was 30 of falled Jati (Tectona grandis L.f) trees. This sample was divided into two, they are data for volume arrangement and data for model validation. Best model choosen considered value indicator such as R2, R2adj, F test, and value of s in model arrangenment step and the value of chi-square (x2), bias, standard error (SE), and RMSE in model validation step bassed on available equation models. The compared and analysis result to value of R2adj and chi-square (x2), showed that equation model accurately in estimating volume in Regency Kulon Progo private forest are equation of Berkhout (V=0.000442D2.229), Stoate (V=1.116+0.00000913D+ 0.00000584D2T-0.0723T), and Hohenadl-Krenn (V=0.137-0.014D+0.0013D2).
Keyword: private forest, Jati (Tectona grandis L.f), volume table

Judul: Studi penyusunan tabel volume lokal jati ( Tectona grandis L. f. ) untuk kesatuan hutan Purwakarta
Abstrak: Dalam kegiatan pengelolaan hutan diperlukan suatu rencana pengelolaan yang baik, cermat dan terarah. Untuk keperluan tersebut, inventarisasi hutan merupakan bagian kegiatan perencanaan yang penting karena data yang dihasilkan akan menjadi dasar utama bagi usaha pemanfaatan hutan. Mengingat kondisi tanaman Jati (Tectona grandis L.f) meliputi wilayah yang luas, serta adanya faktor pembatas alam (kesuburan tanah, jenis tanah, ketinggian tempat, dan lain-lain), biaya dan waktu pelaksanaan inventarisasi, maka pengukuran tinggi pohon merupakan pekerjaan yang menyulitkan. Oleh sebab itu perlu disusun suatu kunci pedoman (tabel tegakan. volume lokal) dalam pendugaan potensi Penelitian ini dilaksanakan dengan tujuan untuk mencoba menyusun suatu tabel volume lokal bagi tegakan Jati (Tectona grandis L.f), sehingga kegiatan inventarisasi hutan dapat dilaksanakan secara sederhana, efisien dan praktis tanpa mengurangi ketelitian yang diinginkan.
Keyword: 

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