Judul: Komposisi Jenis dan Struktur Hutan di Taman Hutan Raya Dr. Moh. Hatta, Padang, Sumatera Barat
Abstrak: According to Law of Republic of Indonesia No. 5 of 1990, the Forest Park is a nature conservation area which collects natural and unnatural plants and animals. The composition and structure of stands can be used to estimate the density of trees in various diameter classes. This study aims to determine the composition and structure of the vegetation contained in the block protection, utilization, and collection. The research was conducted from January to February 2021 at Bung Hatta Forest Park Conservation Area Padang. The research result show that dominant type found in the protection block for the tree’s level was Glochidion obscurum. In the utilization block, the dominant type called Pinus merkusii, then in the collection block dominated by Swietenia macrophylla. The diversity index value (H') on the three blocks is classified as the moderate with H' value between 1-2. Meanwhile, the wealth index is classified as the low with a value of R1 <3.5. The result also found that the pattern of species distribution is clumped. The stratification of Bung Hatta Forest Park Conservation Area’s crown is in the B and C stratum.
Keyword: H', dominant type, composition, R1, vegetation structure

Judul: Komposisi Jenis dan Struktur Tegakan di Hutan Penelitian Haurbentes Jasinga, Kabupaten Bogor
Abstrak: The Haurbentes Special Purpose Forest Area which functioned as a reaserch forest has various types of stands. This study was purposed to obtain informations on the species composition and stand structure in Harbuentes Research Forest. Unit samples taken by using purposing sampling method on 20 ha Haurbentes forest area. Observed variables in this study are number of vegetation individuals for seedlings and saplings, also diameter and number of individuals vegetation level from trees which diameter greater than 10 cm in 10 m x 50 m pots with seedlings, saplings and tree measuring on each type. Estimation of forest stands potential calculated with Dipterocarpaceae volume estimation and Berkhout linier transformation equation. Based on the observation, biodiversity index forest (H') in Haurbentes Research Forest for all levels of growth were categorized as moderate classification since it had biodiversity index forest values between 1,5 to 3,5. The species richness for seedling and trees growth rate were categorized as low classification and the sapling growth rate were categorized as high classification. The highest number of plants was founded in sapling growth rate and the lowest number of plants was founded in seedling and trees growth rate, with the value of 20 species of seedling, 51 species of saplings and 15 species of trees. Species of Shorea mecistopteryx was the dominant species at every stages of growth because these species are found in large numbers and spread almost evenly throughout the area. The stand structure of Haurbentes Forest was characterized as the larger the size of the diameter of the rod the more reduced the number of individuals of the species (the inverted "J" letter curve graphic). Based on 2012 tree treatise at the Haurbentes research forest in the area of 20 ha were found 2987 trees. Total of Dipterocarpaceae wood volume potential obtained in Haurbentes research forest is 592,77 m3 or 29,64 m3/ha.
Keyword: stand structure, species composition

Judul: Peran Imunoglobulin Y (IgY) sebagai Anti Adhesi dan opsonin untuk Pencegahan serangan Salmonella Enteritidis
Abstrak: Ayam petelur memiliki peranan penting sebagai penghasil antibodi poliklonal. Antibodi ayam atau dikenal dengan IgY dapat dipurifikasi dari kuning telur. Biaya untuk memproduksi IgY relatif lebih murah daripada antibodi mamalia karena biaya pemeliharaan ayam tidak mahal, relatif lebih murah dan cepat menghasilkan telur. Penelitian ini bertujuan untuk mempelajari cara memproduksi IgY anti S. Enteritidis dari telur dan mengetahui peran IgY S. Enteritidis sebagai anti adhesi dan opsonin untuk pencegahan serangan S. Enteritidis. IgY spesifik dikoleksi dari telur ayam Single Comb Brown Leghorn yang telah diimunisasi dengaan antigen untuk S. Enteritidis. Imunisasi diaplikasikan secara intravena dengan dosis antigen untuk S. Enteritidis 0.5 ml (109 sel/ml) selama tiga hari berturut-turut pada minggu pertama. Selanjutnya dilakukan pengulangan imunisasi sebanyak 3 kali dengan interval waktu seminggu secara intramuscular dengan dosis untuk antigen 1 ml (109 sel/ml) S. Enteritidis dalam Freund’s adjuvant complete di minggu kedua dan Freund’s adjuvant incomplete di minggu ketiga dan keempat. Uji agar gel prepitasi (AGP) dilakukan untuk mengetahui terbentuknya IgY anti S. Enteritidis. Ekstraksi IgY dari kuning telur menggunakan metode PEG-amonium sulfat, kemudian dipurifikasi dengan fast protein liquid chromatography. Konsentrasi IgY yang telah dimurnikan dihitung dengan spektrofotometer UV dan untuk mengetahui berat molekul dari IgY dilakukan dengan SDS-PAGE.
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