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: Model Penduga Peubah Tegakan Pinus merkusii pada Areal Rehabilitasi ConocoPhillips di Hutan Pendidikan Gunung Walat.
Abstrak: Hutan Pendidikan Gunung Walat (HPGW) bekerjasama dengan PT ConocoPhillips (COPHI) melakukan penanaman pohon di areal terdegradasi dengan tujuan meningkatkan cadangan karbon. Penelitian mengenai model penduga peubah tegakan pada areal rehabilitasi COPHI di HPGW belum pernah dilakukan sebelumnya. Penelitian ini bertujuan untuk memperoleh model penduga peubah tegakan Pinus merkusii, yaitu diameter, tinggi, bidang dasar, dan biomassa pada areal rehabilitasi COPHI. Data peubah tegakan diperoleh dari pengukuran 32 plot contoh yang tersebar secara sistematik pada empat tahun tanam. Data peubah tegakan dianalisis menggunakan model-model regresi linier dan non-linier. Model terbaik dipilih berdasarkan nilai koefisien determinasi (R2) dan nilai RMSE. Model terpilih untuk menduga diameter (D, cm), tinggi (H, m), luas bidang dasar (G, m2/ha), dan biomassa (W, ton/ha) tegakan berturut-turut adalah D= - 2.00987+4.56934*ln(A), H= 0.07+0.536A+0.539D, G= -0.0809+0.00628A +0.0269D , dan W= H/(1.05324 – 0.0540116 * H).
Keyword: model penduga, pinus, rehabilitasi

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