Judul: Taxonomy and Ethnomycology of Wild Mushrooms Utilized by Goalpara Community in Sukabumi
Abstrak: Etnomikologi merupakan cabang ilmu yang mengkaji tentang pengetahuan masyarakat lokal di suatu wilayah mengenai pendayagunaan jamur dalam kehidupan sehari-hari. Salah satu tempat yang memiliki keragaman jamur liar dan informasi etnomikologi, tetapi belum diinventarisasi dengan baik adalah Goalpara, Sukabumi, Jawa Barat. Penelitian ini bertujuan menyediakan data taksonomi, mencatat informasi etnomikologi jamur liar yang dimanfaatkan oleh masyarakat Goalpara, dan menguji potensinya sebagai agen antibakteri Enteropathogenic Escherichia coli (EPEC) penyebab diare. Prosedur yang digunakan diantaranya pengumpulan data etnomikologi, pengambilan sampel tubuh buah jamur, identifikasi morfologi dan molekuler, serta uji potensi aktivitas antibakteri. Berdasarkan hasil penelitian, terdapat 11 spesies jamur yang dimanfaatkan dan 29 jamur yang tidak dimanfaatkan oleh masyarakat Goalpara. Sebagian besar jamur liar yang ditemukan merupakan catatan baru untuk Indonesia. Dari 11 jamur yang dimanfatkan, sebanyak 9 spesies dikonsumsi yakni Pleurotus giganteus, Hohenbuehelia sp., Caloboletus xiangtoushanensis, Boletus sp., Fomitopsis sp., Microporus sp., Russula sp., Marasmiellus sp., dan Auricularia sp. Sementara itu, Lycoperdon sp. dan Calvatia sp. dimanfaatkan sebagai obat tradisional. Pengetahuan pendayagunaan jamur sebagian besar dimiliki oleh para tetua di Goalpara dan sedikit dari generasi muda. Uji potensi aktivitas antibakteri terhadap EPEC menunjukkan bahwa baik jamur yang dimanfaatkan dan tidak dimanfaatkan secara tradisional oleh masyarakat Goalpara memiliki kemampuan menghambat pertumbuhan EPEC., Ethnomycology is a branch of science about the knowledge of local communities in an area regarding the utilization of mushrooms in daily life. One place with diverse wild mushrooms and ethnomycological information that has not been well inventoried is Goalpara, Sukabumi, West Java. This study aims to provide taxonomic data, record ethnomycological information on wild mushrooms utilized by the Goalpara community, and test their potential as antibacterial agents of Enteropathogenic Escherichia coli (EPEC) causing diarrhea. The procedures used include ethnomycological data collection, mushroom sampling, morphological and molecular identification, and potential antibacterial activity tests. Based on the results, 11 species of mushrooms are utilized by the Goalpara community and 29 mushrooms are not. Most of the wild mushrooms found are new records for Indonesia. About 9 mushrooms are consumed, namely Pleurotus giganteus, Hohenbuehelia sp., Caloboletus xiangtoushanensis, Boletus sp., Fomitopsis sp., Microporus sp., Russula sp., Marasmiellus sp., and Auricularia sp. Meanwhile, Lycoperdon sp. and Calvatia sp. are used as traditional medicines. The knowledge of mushroom utilization is mostly owned by the elders in Goalpara and a little from the younger generation. The potential antibacterial activity test against EPEC showed that both utilized and not utilized mushrooms could inhibit the growth of EPEC.
Keyword: antibacterial, Inventory, morphology, Local community, Molecular

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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