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: Perbaikan Pertumbuhan Tanaman Sengon (Paraserianthes falcataria (L.) Neilsen) dengan Teknik Lateral Root Manipulation (LRM) di Bojong Jengkol, Kabupaten Bogor
Abstrak: Sengon is a fast growing tree species that has good adaptation. But when the land have been compacted and densited, sengon shows dwarfed growth. A lateral root manipulation (LRM) is one of cultivating plants that can fix the growth of plants. The study is aimed to know the effect of LRM technique on the sengon improvment growth. The methodology applied the factorial randomized design method which have three factors. The first factor is to cut the lateral root, the second is to apply stimulantion on root and microbe, and the third is to fertilize periodic. The results show that combination cutting root and fertilize periodic without applying stimulantion on root and microbe increase height improved 10,45 cm per week and number of bud 10 peices per week. All treatments did not effect on the stem diameter. The variables of the treatment visualy dont changes significally color of leaf and new root growing. However, the treatment of cutting root can stimulate to grow a new root.
Keyword: Bogor Agricultural University (IPB), root and microbe stimulant, Paraserianthes falcataria, lateral root manipulation, fertilize

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