Judul: Growth of Diameter Mycelium Colony of JakabaBHP01 (Sordariomycetes, Ascomycota) Mushroom on Various Media, pH, and Temperatures
Abstrak: Jakaba atau jamur keberuntungan abadi merupakan salah satu cendawan yang diduga memiliki manfaat berupa nutrisi bagi tanaman sehingga berpotensi untuk dibudidayakan lebih lanjut. Keberhasilan suatu biakan murni didasarkan pada keberhasilan pembuatan media dan kesesuaian lingkungan terhadap pertumbuhan miselium cendawan. Maka dari itu penting untuk dilakukan identifikasi karakteristik cendawan serta analisis jenis media, keasaman media (pH), dan suhu inkubasi yang sesuai untuk pertumbuhan isolat jakaba BHP01. Perlakuan terdiri atas tiga faktor dengan masing-masing faktor terdiri atas 3 taraf. Faktor macam media terdiri atas Potato Dextrose Agar, Malt Extract Agar, dan Malt Pepton Agar, faktor pH terdiri atas pH 4, pH 6, dan pH 8, serta faktor suhu inkubasi, yaitu 10 ℃, ± 28 ℃, dan 35 ℃. Sehingga terdapat 27 macam kombinasi perlakuan dengan tiga ulangan. Rata-rata diameter isolat jakaba tertinggi terdapat pada kombinasi perlakuan M2P1S2 yaitu media Malt Extract Agar, pH 4, dan suhu inkubasi ± 28 ℃. Hasil analisis statistik menunjukkan bahwa macam media dan pH tidak memberikan pengaruh yang nyata terhadap pertumbuhan diamater isolat jakaba, sedangkan suhu memberikan pengaruh yang nyata., Jakaba or perennial lucky mushroom is one of the fungi that is thought to have benefits in the form of nutrients for plants so that it has the potential for further cultivation. The success of a pure culture is based on the success of making media and the suitability of the environment for fungal mycelium growth. Therefore, it is urgent to identify the characteristics of the fungus and analyze the type of media, media acidity (pH), and incubation temperature suitable for the growth of Jakaba isolates. The treatment consisted of three factors with each factor consisting of 3 level. The media type factor consist Potato Dextrose Agar, Malt Extract Agar, and Malt Peptone Agar, the pH factor consists of pH 4, pH 6, pH 8, and the incubation temperature factor 10 ℃, ± 28 ℃, and 35 ℃. So there are 27 kinds of treatment combinations with three replications. The highest average diameter of Jakaba isolates was found in the M2P1S2 treatment combination, Malt Extract Agar media, pH 4, and incubation temperature ± 28 ℃. The results of statistical analysis showed that the type of media and pH did not have a significant effect on the growth of Jakaba isolate diameter, while temperature had a significant effect.
Keyword: media, pertumbuhan miselium, pH, suhu

Judul: Identification Wild Ear Mushroom and Its Cultivation Trial with the Addition Crystal Guava Leaf Litter
Abstrak: Keragaman jamur liar edible (JLE) dan kultivasinya belum banyak diketahui dan dimanfaatkan dengan baik di Indonesia. Salah satu JLE dengan informasi yang minim adalah jamur kuping liar Auricularia spp., padahal JLE tersebut berpotensi dikembangkan sebagai bahan konsumsi bergizi. Disisi lain, produksi jamur kuping komersial (JKK) di Indonesia tiap tahunnya meningkat, sehingga menyebabkan peningkatan permintaan bibit jamur dan serbuk kayu. Penelitian ini bertujuan untuk mengidentifikasi spesies jamur kuping liar dan membudidayakannya dengan substrat tambahan serasah daun jambu kristal. Pengambilan sampel dilakukan dengan metode oportunistik. Sampel diisolasi dan dianalisis secara morfologi serta molekuler untuk diketahui posisi taksonominya. Hasil identifikasi mengkonfirmasi beberapa spesies jamur kuping liar diantaranya Auricularia cf. auricula-judae, Auricularia cornea, Auricularia cf. fuscosuccinea, dan Auricularia cf. nigricans. Jamur kuping liar yang berhasil diisolasi dan dibuat bibit adalah A. cornea, namun belum mampu tumbuh pada baglog, sehingga serasah diujikan pada budidaya JKK. Penambahan substrat serasah daun jambu kristal pada konsentrasi 0, 5, 10 dan 100%. Keberhasilan budidaya jamur dilihat dari nilai efisiensi biologis setiap perlakuannya. Substrat dengan penambahan daun jambu kristal 10% memiliki efisiensi biologis tertinggi. Hasil budidaya JKK menunjukkan adanya potensi dari serasah daun jambu kristal sebagai campuran substrat baglog., The diversity and cultivation of edible wild mushroom in Indonesia hasn't been widely known in Indonesia. One of them is Auricularia spp. Edible wild mushrooms are potentially used as nutritious food. The production of mushroom in Indonesia developed each year causing increase in demand of mushroom seeds and wood powder. This research was carried out to identify and cultivate the wild mushroom with crystal guava leaf litter as substrate additive. The sampling was done by opportunistic method. The samples were isolated and analyzed morphologically and also at molecular level for their taxonomy identification. The identification resulted in four different species: Auricularia cf. auricula-judae, Auricularia cornea, Auricularia cf. fuscosuccinea, Auricularia cf. nigricans. Wild mushroom that successfully isolated and seeded was A. cornea, but it failed to grow in baglog. Based on that reason, crystal guava leaf litter was tested to cultivate commercial mushroom. The concentrations of crystal guava leaf litter used were 5, 10, and 10%. The success indicator of mushroom cultivation is their biological efficiency in every treatment. Substrate with 10% addition of crystal guava leaf litter demonstrated the highest biological efficiency rate. The cultivation result of mushroom indicated that crystal guava leaf litter is potential as a substrate mixture in baglog.
Keyword: Auricularia, commercial, substrate, wild mushroom

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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