Judul: Aktivitas Anti-Colletotrichum dan Aplikasi Edible Coating Kitosan berbasis Black Soldier Fly pada Buah Pepaya Potong (Carica papaya L.)
Abstrak: Buah pepaya (Carica papaya L.) merupakan tanaman klimakterik yang mengandung banyak manfaat namun memiliki umur simpan yang singkat, yaitu sekitar 7 hingga 14 hari. Kitosan, salah satu bahan alami yang dapat diaplikasikan sebagai edible coating yang mampu memperpanjang masa simpan buah, salah satu sumber bahan bakunya berasal dari selongsong pupa maggot (Hermetia illucens). Penelitian ini bertujuan menguji aktivitas antifungal kitosan Black Soldier Fly terhadap Colletotrichum sp. penyebab antraknosa pada tanaman pepaya serta aplikasinya sebagai edible coating pada buah pepaya potong. Kitosan dilarutkan dalam asetat 2% dengan konsentrasi 25, 50, 75, dan 100 ppm. Larutan kitosan digunakan dalam uji aktivitas antifungal, serta diaplikasikan sebagai edible coating pada buah pepaya potong secara spray dan celup. Hasil penelitian menunjukkan bahwa penghambatan penyusutan bobot buah serta aktivitas antifungal terbaik terdapat pada kitosan konsentrasi 100 ppm dengan aplikasi coating secara spray. Aplikasi coating kitosan pada buah pepaya mampu memperpanjang masa simpan buah hingga 20 hari lebih lama dibandingkan kontrol., Papaya fruit (Carica papaya L.) is a climacteric plant that has numerous benefits albeit with a short shelf-life, which is around 7 to 14 days. Chitosan, one of natural sources that can be applicated as an edible coating that can prolong the fruit’s shelf-life, can be sourced from maggot exuviae (Hermetia illucens). This study aimed to test chitosan’s antifungal activity against Colletotrichum sp. which causes antrachnose and its application as edible coating on cut papaya fruit. Chitosan was dissolved in 2% acetic acid. Chitosan solution are then used in antifungal test and also applied as edible coating on cut papaya fruit by spray and immersion method. Results showed that the best fruit weight-loss inhibition and antifungal activity was obtained on chitosan with concentration of 100 ppm with coating application by spray method. Chitosan coating application on cut papaya fruit can prolong its shelflife for up to 20 days longer than control group.
Keyword: Aktivitas antifungi, buah pepaya, edible coating, kitosan

Judul: Penggunaan Kitosan dan Lilin Lebah sebagai Bahan Pelapis untuk Meningkatkan Masa Simpan dan Mempertahankan Kualitas Buah Pepaya
Abstrak: Papaya is a climacteric fruit with increased respiration rate during ripening process. Respiration rate papaya can be inhibited by providing a coating on the surface of the fruit. Coating materials that can be used include chitosan and beeswax. The purpose of this research is to study the effect of chitosan and beeswax coating on the shelf life and quality of Callina papaya fruit during storage. Experiment was carried from November 2014 until March 2015 at the Experimental Field of PKHT, Tajur and Postharvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The experimental design used was completely randomized design with 3 treatments and 3 replications, there are chitosan 0.75%, beeswax 6%, and the control (without coating). Data were analyzed by F test and treatments that affect were analyzed by Duncan Multiple Range Test (DMRT). Parameters measured were shelf life, the index of fruit skin color scale, respiration rate, weight loss, skin firmness, pulp firmness, total soluble solids, total titratable acids, and the content of vitamin C. Results of the experiments showed that chitosan and beeswax treatments can extend the shelf life of papaya Callina 4–5 days compared to control because it inhibits respiration rate papaya during storage. The use of chitosan and beeswax can maintain the physical and chemical quality of papaya fruit Callina.
Keyword: Callina, chemical quality, physical quality, postharvest ripening, respiration rate

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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