Judul: Combination effect of Atonic Growth Regulator with PES (Provasoli Enrich Seawater) on Eucheuma cottonii Seaweed Growth
Abstrak: Eucheuma cottonii is a type of seaweed that has been widely cultivated in Indonesia. The purpose of this study was to measure the effect of the combination of Atonic ZPT (Growth Regulator) and PES (Provasoli Enrich Seawater) media on the growth of Eucheuma cottonii explants. The research was carried out in April—May 2020, at the Seaweed Tissue Culture Laboratory at the Brackish Water Cultivation Fishery Center (BPBAP) Takalar, South Sulawesi. The study was designed using a completely randomized design (CRD) method with four treatments consisting of K (ZPT 0 ppm and PES 0%), A (ZPT 15 ppm and PES 1%), B (ZPT 15 ppm and PES 2%) and C (ZPT 15 ppm and PES 3%). The seaweed were Eucheuma cottonii from Laikang Village, Manggara Bombang District, Takalar Regency, South Sulawesi with an initial weight of 0.093 ± 0.008 grams and an initial length of 2.08 ± 0.01 cm. Study was carried out for 35 days and sampling was done once every 7 days. The results showed that the addition of a combination of 15 ppm atonic growth stimulant with 3% provasoli enriched seawater media on the culture medium could produce the highest survival rate and growth of Eucheuma cottonii seaweed explants that were better than the control or with the addition of 15 ppm Atonic ZPT and PES 1 %.
Keyword: Eucheuma cottonii, kultur jaringan, laju pertumbuhan, sintasan

Judul: Pengaruh Umur Panen dan Metode Penjemuran terhadap Mutu Fisik Rumput Laut Eucheuma collonii sp
Abstrak: The purpose of this study was to the characteristics of drying and analyze the effects of harvesting age, rack drying and standing drying methods on physical quality of dried seaweed Eucheuma cottonii sp. The research was conducted in four stages consist of seaweed cultivation of Eucheuma cottonii sp, harvest time, drying and organoleptic tests with split-split-plot design (SSPD) 2 x 3 x 2 with 2 replications as block. Drying method (A) is the whole plot factor which consisted of 2 levels i.e. rack drying (a1) and standing drying (a2). Harvesting age (B) is sub-plot factor which consisted of 3 levels i.e. 35 days of harvest time (b1), 45 days (b2) and 55 days (b3). Thickness/distance (C) was sub – subplot which consisted of 2 levels i.e. 10 cm/15 cm (c1) and 20 cm/30 cm (c2). Sun radiation intensity ranged between 50 W m-2 – 700 W m-2, air temperature ranged between 23.3 0C – 31.7 0C, relative humidity (RH) 56% to 95% while the wind speed ranged between 2 m s-1 – 9 m s-1. Sun intensity was the most significant factor in increasing drying rate compared to temperature and wind speed during drying process. Initial moisture content of Euchema cottonii sp seaweed ranged between 82.57% – 83.90%. The highest moisture content was found at seaweed which harvested at 35 days i.e. 83.90%. The lowest moisture content occurred at seaweed which harvested at 45 days i.e. 82.57%. The fastest drying rate generated seaweed Eucheuma cottonii sp that is harvested at 35 days and then dried using a hanging method with a distance of 15 cm. The range of impurities from 0.42% – 2.25% with average 1.10%. The average of organoleptic test for visibly of dried seewead was 3.26 with range 2.70 to 4.40, dried seaweed texture was 3.18 with range 2.40 to 4.17 and smell was 3.94 with 2.60 to 4.30 of range. Rack drying method generating the physical qualities of dried seaweed such as the foreign material, visibility and flavor was better. Harvesting age at 45 days produced less foreign material and best visibility, texture and flavor compared with harvest time at 35 days and 55 days. Drying with 20 cm thickness and 30 cm distance was significantly produced better dried seaweed quality compared to 10/15 cm of thickness or distance. The best physical quality of dried seaweed Eucheuma cottonii sp was produced by harvesting the seaweed at 45 days and followed by rack drying method.
Keyword: harvesting age, drying methods, physical quality, seaweed, eucheuma cottonii sp

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