Judul: Characterization of Chitin and Chitosan from Alam Crickets (Gryllus mitratus) from CV Alam Lestari Cibinong Animal Husbandry
Abstrak: Jangkrik memiliki eksoskeleton yang terdiri dari polisakarida struktural yang digunakan sebagai pelindung tubuhnya terutama bagian abdomen. Pemanfaatan jangkrik sebagai bahan pakan maupun pangan memiliki keterbatasan, hal ini disebabkan karena kandungan kitin yang cukup tinggi. Kitin merupakan komponen struktural yang membentuk eksoskeleton organisme insekta, fungi dan krustasea. Kitin tidak dapat larut dalam air, larutan basa pekat, larutan asam dan pelarut organik. Proses ekstraksi jangkrik menjadi kitin dibagi menjadi tiga tahap yaitu demineralisasi, deproteinisasi dan depigmentasi. Kitin dapat dimanfaatkan dengan cara mengubahnya menjadi kitosan. Kitosan merupakan polisakarida alami, tidak beracun, biokompatibel, ramah lingkungan dan bioadesif. Proses ekstraksi kitin menjadi kitosan diperlukan tahap deasetilasi. Penelitian ini bertujuan untuk mengkarakterisasi kitin dan kitosan sebagai hasil samping budidaya jangkrik alam (Gryllus mitratus). Variabel yang diamati adalah kitin dan kitosan yang dihasilkan dari jangkrik meliputi warna, bentuk partikel, kadar air, kadar abu, kadar nitrogen dan derajat deasetilasi. Hasil pengujian menunjukkan bahwa kitin yang dihasilkan memiliki bentuk partikel serpihan, berwarna putih, kadar air sebesar 9,74%, kadar abu sebesar 1,69%, kadar nitrogen sebesar 4,73% dan derajat deasetilasi sebesar 46,41%. Produk kitosan yang dihasilkan berbentuk serpihan, berwarna cokelat muda, kadar air sebesar 8,85%, kadar abu sebesar 1,35%, kadar nitrogen sebesar 4,25% dan derajat deasetilasi sebesar 94,69%. Hasil tersebut menunjukkan bahwa kitin dan kitosan yang dihasilkan dari jangkrik alam telah memenuhi SNI. Kata kunci: jangkrik alam, kitin, kitosan, Crickets have exoskeleton that consisting of polysaccharides of structural and used as a protective body especially the abdomen. The utilization of crickets as feed materials or food has its limitations, it is caused due to the content of chitin, which is quite high. Chitin is a structural component that forms the eksoskeleton organisms insects, fungi and crustaceans. Chitin can not be dissolved in water, the solution bases concentrated, acid solution and organic solvents. The process of extraction of crickets into chitin is divided into three stages: demineralization, deproteinisas and depigmentation. Chitin can be utilized by converting it into chitosan. Chitosan is a natural polysaccharide, non-toxic, biocompatible, environmentally friendly and bioadhesif. Extraction process of chitin into chitosan necessary stage deasetilasi. This study aims to characterize the chitin and chitosan as a result of the addition to the cultivation of crickets nature (Gryllus mitratus). The observed variable is the chitin and chitosan produced from crickets include color, particle shape, water content, ash content, nitrogen content and degree of deacetylation. The test results showed that the chitin produced has the form of flaky particles, white-colored, the moisture content amounted to 9,74%, ash content of 1,69%, the nitrogen content of of 4,73% and a degree of deacetylation of 46,41%. Products chitosan the resulting shaped flakes, coloured light brown, water content of 8,85%, ash content of 1,35%, the nitrogen content of 4,25% and a degree of deacetylation of 94,69%. These results indicate that the chitin and chitosan produced from crickets has fulfilled the SNI. Key words: alam crickets, chitin, chitosan
Keyword: alam crickets, chitin, chitosan

Judul: Performa Jangkrik Alam (Gryllus mitratus) dengan  Media dan Durasi Pengangkutan yang Berbeda
Abstrak: Jangkrik merupakan salah satu jenis serangga yang memiliki siklus hidup cepat, konversi pakan tinggi, penggunaan lahan rendah dan berprotein tinggi. Tingginya permintaan konsumen terhadap jangkrik mengharuskan produsen jangkrik untuk mendistribusikan jangkriknya, namun tidak memperhatikan pengangkutan jangkrik alam yang dapat mempengaruhi performanya. Penelitian ini bertujuan untuk menganalisis pengaruh media dan durasi pengangkutan yang berbeda terhadap performa jangkrik alam Gryllus mitratus. Penelitian ini menggunakan jangkrik alam Gryllus mitratus sebanyak 13,5 kg, klaras (daun pisang kering) dan egg tray yang diangkut selama 2 jam, 3 jam, dan 4 jam. Peubah yang diamati meliputi persentase susut bobot dan mortalitas. Penelitian ini menggunakan Rancangan Acak Lengkap pola faktorial dengan dua faktor yaitu durasi dan media pengangkutan. Data dianalisis ragam (ANOVA) dan hasil analisis yang berbeda nyata dilanjutkan dengan uji Duncan. Hasil penelitian menunjukan bahwa media tidak berpengaruh nyata terhadap susut bobot dan mortalitas, dan durasi perjalanan tidak berpengaruh nyata terhadap susut bobot jangkrik namun berpengaruh nyata terhadap mortalitas., Crickets are one type of insect that has a fast life cycle, high feed conversion, low land use and high protein. High consumer demand for crickets makes many cricket producers distribute the crickets, but do not pay attention to the transportation of cricket which can affect their performance. This study aims to determine the effect of different media and transport duration on the performance of Gryllus mitratus cricket. This study used 13.5 kg of Gryllus mitratus cricket, dried banana leaves, and egg tray transported for 2 hours, 3 hours, and 4 hours. The observed variables included percentage of weight loss and mortality. The data were analyzed for variance (ANOVA) and the results of the analysis were significantly different, followed by the Duncan test. The results showed that the media had no significant effect on weight loss and mortality, and transport duration had no significant effect on cricket weight loss but had a significant effect on mortality.
Keyword: durasi pengangkutan, egg tray, Gryllus mitratus, klaras

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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