Judul: Perilaku Cacing Tanah (Perionyx excavatus) pada Media Kotoran Sapi: Langkah Awal Domestikasi
Abstrak: The most common found earth worm in Indonesia is Perionyx excavatus. This worm has weight and body length larger than other types of earthworms. This study aimed to observe the behavior of P. excavatus on cow dung media as a first step to facilitate the process of domestication of cultivation. The experimental design used in this research was Completely Randomized Design. Observations were conducted by observing the daily behavior of P. excavatus for 24 hours, by observing the daily behavior P. excavatus were maintained in four media, 100% cow dung, 50% banana midrib : 50% cow dung, 90% banana midrib : 10% cow dung, and 100% soil. Each media were consisted of 3 replication. Data were analyzed using ANOVA. Based on observations, P. excavatus performed 4 main activities, which were movement, resting, eating and mating. The best media to supports the activities of P.excavatus based on the percentage of movement activity and eating was 50% banana midrib : 50% cow dung. To support the production of cocoon, the best media 90% banana midrib : 10% cow dung, and the best media to support the juvenile production was 100% cow dung based on the value of the coefficient of variance were 71.18%, and 10, 23%.
Keyword: Bogor Agricultural University (IPB), Perionyx excavatus, daily behavior, local earthworms

Judul: Performa Cacing Tanah (Lumbricus rubellus) pada Media Kotoran Sapi dengan Penambahan Tepung Kulit Kakao
Abstrak: Earthworms are one of the decomposer organisms, decomposition by hworms can be 3-5 times faster than microbes. Earthworm media from cow ng can be added to other wastes that have been fermented or decomposed. Cow ng and cocoa shell waste can be used as a medium for growing earthworms. s study aims to analyze the performance of worms (Lumbricus rubellus) on le manure with the addition of cocoa shell as a living medium with different els. The design used in this study was a completely randomized design (CRD) h 4 (four) treatments and 1 (one) control, each of which was repeated 3 (three) es and analyzed by Tukey's follow-up test. The rearing medium with the ition of cocoa shell flour had an effect (P<0.05) on improving the performance earthworms (Lumbricus rubellus). The addition of cocoa shell powder to cow ng media is up to 15% better than other treatments because it can improve the formance of earthworms (Lumbricus rubellus) including the total worm weight 111.67 grams, cocoon production of 134.00 grains and an average reduced dia of 569.33 grams.
Keyword: cattle manure, cocoa shell, earthworm, performance

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. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular