Judul: Effectiveness of Chicken Egg White Lysozyme (EWL) as Antibacterial Alabio Duck Eggs
Abstrak: Telur tetas terkadang sering disimpan sebelum ditetaskan dan akan menjadi sasaran infeksi bakteri yang dipertanyakan. Telur biasanya dicuci dengan air hangat sebelum proses penetasan dan efektivitasnya masih diragukan. Oleh karena itu, dibutuhkan suatu penambahan senyawa antibakteri setelah telur dicuci, yaitu lisozim putih telur (LPT). Penelitian ini bertujuan menganalisis efektivitas LPT sebagai agen antibakterial telur tetas itik alabio selama penyimpanan. Sebanyak 60 butir telur diberi 4 perlakuan yaitu tanpa perlakuan, dicuci dengan air hangat, dan perendaman lisozim pada larutan 1 g mL-1 dan 2,5 g mL-1. Perubahan mikrobiologi dan fisik pada telur diamati pada hari ke-0, 4, dan 7. Hasil pengujian seluruh sampel telur bebas dari Salmonella spp. Menariknya, hasil total plate count (TPC), penyusutan bobot, dan kualitas kantung udara menunjukkan bahwa perlakuan pada LPT dapat mencegah penetrasi bakteri dari permukaan kerabang telur. Pengaruh perendaman LPT bergantung pada konsentrasinya dimana konsenstrasi yang lebih tinggi dari LPT dapat menghasilkan nilai TPC lebih rendah, mengurangi persentase penyusutan bobot, dan mempertahankan kualitas kantung udara pada telur tetas, Practically, hatching eggs are often to be stored prior to hatch and will be the target of a definitive questionable bacterial infection. Eggs are usually washed with warm water prior to the hatching process and their effectiveness is questionable. Therefore, it is necessary to add an antibacterial compound after the eggs are washed, namely egg white lysozyme (EWL). This research is aimed to analyze the effectiveness of EWL as an antibacterial agent for alabio hatching eggs during storage. The total of 60 eggs were given 4 treatments, namely untreated, washed with warm water, and soaking lysozyme in a solution of 1 g mL-1 and 2,5 g mL-1. Microbiological and physical changes in eggs were observed on days 0, 4, and 7. The results showed that all eggs were free from Salmonella spp. Interestingly, the results of the total plate count (TPC), weight loss, and air sacs quality indicated that the EWL treatment could prevent bacterial penetration from the surface of the eggshell. The effect of immersion in EWL depends on its concentration where a higher concentration of EWL can yield in a lower TPC values, reduce weight loss, and maintain air sacs quality in hatching eggs.
Keyword: alabio duck hatching eggs, antibacterial, chicken egg white lysozyme

Judul: Daya Tetas Telur Itik Alabio dan Persilangan Cihateup-Alabio dengan Bahan Sanitasi Alami
Abstrak: Hatchability of duck lower than the chicken and quail. Dirty egg shell can cause low hatchability. The use of disinfectants is aimed to suppress the growth of bacteria on the eggshell. Lemon is a natural disinfectants. This research was aimed to determine hatchability of Alabio (A) and Cihateup-Alabio (CA) crossbreed duck eggs by using natural sanitary materials of lemon juice for soaking eggs. Egg weight, egg shape index, fertility, hatchability, hatching weight, and the death of the embryo were analyzed descriptively. The correlation between egg weight and hatching weight was subjected to regression analyses. Egg weight and egg fertility of CA duck was higher than Alabio duck. Alabio duck egg shape index was greater than that of CA duck. Hatchability of CA eggs was higher than that of Alabio duck. The most high embryo mortality occurred in the period of hatcher (> 25 days). Regression analyses revealed strong correlation between egg weight and hatching weight. The high egg weight produces a high hatching weight.
Keyword: Bogor Agricultural University (IPB), hatchability, fertility, cihateup-alabio crossbreeds, alabio duck

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.