Judul: Dimensi dan Sistem Perakaran Sengon (Paraserianthes falcataria (L.) Nielsen) di Desa Cikarawang, Kecamatan Dramaga, Kabupaten Bogor
Abstrak: Sengon (Paraserianthes falcataria (L) Nielsen) is one of tree species which is currently developed on a wide scale in community forests and highly demanded as raw industrial material. However, most of sengon plantation has not been followed by agroforestry system land use, so that the land becomes less productive. This study aims to identify the dimensions of sengon plants, percent canopy closure, and the root system at different spacing. Spacing used in this study are 2 x 2 m, 3 x 3 m, and 3 x 4 m. The results showed that the plant parameters; diameter at breast height, total height, crown length and crown width best found at 3 x 3 m spacing. However, the largest percentage of canopy closure was found at a spacing of 2 x 2 m. Variable of horizontal root length have different results with other root system variables. The length of the longest horizontal roots were found at a spacing of 3 x 4 m, whereas for horizontal root depth, horizontal root fraction, and shoot-root ratio were found at greatest spacing of 3 x 3 m.
Keyword: rooting system, plant dimension, Paraserianthes falcataria (L) Nielsen, Agroforestry

Judul: Pertumbuhan Tanaman Sengon (Paraserianthes falcataria (L.) Nielsen) pada Kebun Campuran di Desa Karacak, Kecamatan Leuwiliang, Kabupaten Bogor
Abstrak: Salah satu tanaman penghasil kayu yang ditanam pada kebun campuran di Desa Karacak ialah sengon. Pemilihan kombinasi dan jarak tanam tanaman yang dibudidayakan pada kebun belum direncanakan sebelumnya, sehingga memungkinkan terjadinya perbedaan respon bagi pertumbuhan tanaman sengon. Penelitian ini bertujuan untuk melakukan pengkajian pertumbuhan tanaman sengon yang berkaitan dengan komposisi, jarak tanam, dan manajemen pengelolaan, dan juga mengkaji persentase penutupan tajuk tanaman pada kebun campuran di Desa Karacak, Kecamatan Leuwiliang, Kabupaten Bogor. Hasil penelitian menunjukkan kebun campuran KC 4a dengan tanaman sengon umur 1-1,5 tahun dan KC 3b dengan tanaman sengon umur 3 tahun, memiliki pertumbuhan tinggi yang cukup baik dan pertumbuhan diameter yang kurang baik. Sedangkan persentase penutupan tajuk pada kebun campuran tanaman sengon umur 1-1,5 tahun relatif kecil dibandingkan dengan tanaman sengon umur 3 tahun. Pengaruh jarak tanam, komposisi, dan kegiatan pengelolaan diduga menjadi faktor rendahnya pertumbuhan dimensi tanaman dan nilai persentase penutupan tajuk. Petani kebun campuran menganggap sengon merupakan tanaman tidak memerlukan pemeliharaan intensif dan kegiatan pengelolaan lahan yang hanya difokuskan pada tanaman buah-buahan dan tanaman semusim, menyebabkan pertumbuhan dimensi tanaman sengon rendah.
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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