Judul: Model Alometrik Biomassa Pinus (Pinus merkusii Jungh et De Vriese) Berdiameter Kecil di Hutan Pendidikan Gunung Walat, Sukabumi
Abstrak: Forest is an important natural resource for human life either directly or indirectly. One of the indirect benefits of forests is carbon sequestration as a result of photosynthetic processof plants that absorb CO2 from the atmosphere. This study was aimed at determining the biomass expansion factor (BEF), biomass conversion and expansion factor (BCEF), and developing allometric biomass models of small diameter (<10cm) pine (Pinus merkusii Jungh. et De Vriese) at Gunung Walat University Forest. Selection of 35 sample trees on each diameter class was carried out by using purposive sampling method. The biomass of each part of sample trees (steams, branches, and leaves) was estimated using destructive sampling. The largest portion of tree biomass contained in the steam (4.76 kg/tree).
Keyword: small diameter, pine, biomass, allometric

Judul: Model Alometrik Biomassa Pohon Pinus di Areal Rehabilitasi Hutan Pendidikan Gunung Walat (HPGW) Sukabumi, Jawa Barat
Abstrak: Pendugaan biomassa tegakan pinus (Pinus merkusii) di areal rehabilitasi Hutan Pendidikan Gunung Walat (HPGW) memerlukan model alometrik biomassa. Penelitian ini bertujuan untuk menyusun model alometrik biomassa pohon pinus (Pinus merkusii) dengan rentang diameter 0.1–27 cm di areal rehabilitasi HPGW, Sukabumi, Jawa Barat. Penelitian ini menggunakan metode destructive sampling terhadap 11 pohon contoh untuk menghitung biomassa pohon pinus. Model alometrik biomassa disusun dengan menggunakan analisis regresi berdasarkan parameter diameter pangkal batang, diameter setinggi dada, kombinasi diameter pangkal batang dengan tinggi total pohon, dan kombinasi diameter setinggi dada dan tinggi total pohon. Hasil penelitian menunjukkan bahwa model alometrik biomassa terbaik adalah W = 0.0844Dbh2.448 (R2 = 99.16%, R2-adj = 99.06%, S = 1.24 kg). Model alometrik ini dapat menjelaskan sebagian besar keragaman (99%) biomassa pohon pinus dengan mengukur diameter setinggi dada pohon pinus.
Keyword: biomassa, model alometrik, Pinus merkusii, rehabilitasi hutan

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