Judul: Penyusunan tabel volume lokal pohon dan sortimen jati (Tectona grandis L.f ) di KPH Bojonegoro Perum Perhutani Unit II Jawa Timur
Abstrak: Kegiatan inventarisasi hutan bertujuan untuk memperoleh data dan informasi mengenai kondisi sumberdaya hutan yang nantinya digunanakan untuk kegiatan pengelolaan hutan. Salah satu data kondisi sumberdaya hutan adalah potensi tegakan hutan. Potensi tegakan hutan diantaranya dicirikan oleh volume tegakan, yaitu jumlah volume pohon yang ada di dalam suatu tegakan. Penentuan volume pohon dapat dilakukan dengan menggunakan tabel volume lokal (TVL), yang disusun berdasarkan hubungan antara volume pohon dengan peubah penduganya yaitu keliling pohon. KPH Bojonegoro adalah salah satu KPH yang menggunakan TVL untuk menduga volume pohon di lapangan. TVL yang sudah ada di KPH Bojonegoro saat ini adalah TVL yang dibuat pada tahun 2002 dengan menggunakan sebanyak 900 pohon contoh. TVL ini perlu ditinjau secara periodik agar keakurasiannya dapat dipertanggungjawabkan. Untuk itu KPH Bojonegoro mengumpulkan data volume 4561 pohon rebah untuk kemudian diseleksi dan dibuat model penduga volumenya. Data yang dikumpulkan berupa keliling pohon setinggi dada, keliling sortimen, panjang sortimen, volume sortimen, dan volume total pohon. Dari 4561 data yang dikumpulkan, kemudian diseleksi menjadi 1000 pohon berdasarkan kesehatan, kelas keliling, dan tempat tumbuhnya. Data-data yang terpilih tersebut kemudian dibuat model penduga volumenya.
Keyword: 

Judul: Penyusunan tabel volume sortimen jati (Tectona grandis, L.f.) di kph Pemalang perum perhutani unit I Jawa Tengah
Abstrak: Forest inventory is an activity related to tree stand potency prediction, including timber potency. As it is in Jati forest, the purpose of inventory is estimating the quality and quantity of timber potency. Table volume classification is needed to make tree volume prediction less complicated. There are one or more variables that usually used in tree table volume prediction. Because timber values are different in each sorts, Jati timber value is depend on its’ sorts type. Therefore, volume information of each sort type is absolutely required. Spread diagram from the sample tree were conducted to determine the models that will be used to predict the tree volume, whether it is linear (single and multiple) or non-linear. Based on the diagram, tree table volume prediction model can be determined. Tree volume prediction models, according to Spurr (1952), i.e: 1. Berkhout Model : V = a Db 2. Shumacher Hall Model : V = b0 Db1 Tb2 3. Stoate Model : V = b0 + b1 D2 + b3 D2 T + b4 T The Spurr models above can be transformed into linier regression models through the use of logarithmic transformation. Berkhout model type, which is often used in tree volume prediction, needed to be transformed into logarithmic equation. Conversely, Schumacher Hall and Stoate equation are already in linear type that logarithmic transformation is unneeded. Jati volume prediction at KPH Pemalang by using Berkhout model without transformation delivered better accuracy compare to another models with transformation. Best Jati volume prediction model determined at KPH Pemalang is Modified Geometric model : V = 13.432379 D (-29.5999/D). D in the equation determined as diameter breast height, within range 18-70 cm. Jati volume prediction per sort at KPH Pemalang can be determined based on the proportion of sort volume to total tree volume. The tree volume can be attained from model V = 13.432379 D^(-29.5999/D).
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