Judul: Phenophysilogy Studies flowering and Fruit Development of Matoa (Pometia pinnata)
Abstrak: Matoa (Pometia pinnata) merupakan salah satu tanaman buah yang belum dimanfaatkan secara luas di Indonesia. Matoa dapat tumbuh lebih dari 30 meter dan dapat ditemukan didaerah dataran rendah subtropis dan tropis wilayah Asia Pasifik. Penelitian telah menunjukkan manfaat matoa sebagai buah segar, bahan manufaktur serta mengandung bahan antioksidan, antimikroba dan antivirus. Penelitian dasar seperti studi fenologi dibutuhkan untuk memperoleh informasi pembungaan dan mutu buah yang dapat mendukung budidaya, perbanyakan dan keragaman pemanfaatan matoa. Pengamatan deskriptif dilaksanakan di Taman Buah Mekarsari Cileungsi Bogor. Inisiasi pembungaan terjadi pada akhir bulan Juni ketika intensitas curah hujan mengalami penurunan dan bunga matoa mekar pada bulan September. Malai bunga matoa dapat tumbuh 8 sampai 30 cm dengan 4 sampai 16 anak malai membentuk susunan bunga monopodial inflorescence. Waktu pembungaan tahap inisiasi sampai bunga mekar berlangsung sekitar 56 hari dan bakal buah terbentuk sekitar 9 sampai 12 hari setelah mekar. Perkembangan buah mulai bunga mekar sampai buah matang berlangsung sekitar 12 minggu dengan fruitset sekitar 2,5%. Kata kunci: pembungaan, perkembangan buah, fenofisiologi, Pometia pinnata, Matoa (Pometia pinnata) is one of the underutilized fruit in Indonesia which can growth up to 30 m and can be found naturally mainly in lowland subtropical and tropical areas in the Asia-Pacific region. Some research has been revealed that matoa plant usefull as fresh fruit, manufactur products and contains many functional compound as well as antioxidant, antimikroba and antivirus. Basic research as phenology studies is needed to obtain information on flowering and fruit quality to support the cultivation, breeding and diversification of matoa. Descriptive observation of flowering and fruit development of matoa was carried out at the Mekarsari Fruit Garden in Cileungsi Bogor. Generative initiation starts at the last June when the intensity of rainfall decreases and flowers bloom in September. Matoa panicle flower can growth 8 to 30 cm and 4 to 16 of flower branch and cluster of flowers arranged as a monopodial inflorescence. The periode from the emergence of generative buds to blooming lasts an average of 56 days after initiation and ovaries are formed for 9 to 12 days after anthesis. Fruit development from anthesis to maturity an averaged of 12 weeks after blooming, with an average fruitset of 2,51%.
Keyword: flowering, fruit development, phenofisiology, Pometia pinnata

Judul: Long-read Sequences Analysis With MinION Oxford Nanopore Technology on Matoa species (Pometia pinnata (J.R. Forst & G. Forst))
Abstrak: Matoa (Pometia pinnata (J.R & G.forst) merupakan tanaman hutan asli Indonesia yang menghasilkan buah dan juga kayu komersial bernilai ekonomi. Akan tetapi, ketersediaan data genetik dan genomik serta analisis kekerabatan tanaman masih terbatas. Penelitian ini bertujuan untuk menghasilkan data genomik dan kekerabatan terdekat Matoa (Pometia pinnata (J.R & G.forst)) dari Famili Sapindaceae. Penelitian terdiri dari beberapa tahapan yaitu i) ekstraksi DNA dengan metode CTAB, ii) uji kualitas dan kuantitas DNA dengan nanophotometer N80 dan qubit 1.0 fluorometer, iii) sekuensing DNA menggunakan alat MinION ONT serta iv) rekonstruksi kekerabatan dengan pohon filogenetik menggunakan barcode rbcL, matK dan kombinasi rbcL+matK. Hasil menunjukkan bahwa proses sekuensing pada jenis matoa (P. pinnata) menghasilkan sekuens dengan panjang urutan basa sebesar 149.661 bp. Penggunaan kombinasi kedua lokus mampu mengklasifikasikan intraspesies dan antarspesies dengan lebih baik., Matoa (Pometia pinnata (JR & G.forst) is a native Indonesian forest plant that produces fruit as well as economically valuable commercial timber. However, the availability of genetic and genomic data and analysis of this plant relationship is still limited. This study aimed to generate genomic data and the phylogenic relationship between Matoa (Pometia pinnata (JR & G.forst)) within the Sapindaceae family. The research consisted of several stages, namely i) DNA extraction using the CTAB method, ii) quality and quantity testing of DNA with nanophotometer N80 and qubit 1.0 fluorometer, iii) DNA sequencing using the MinION ONT tool and iv) reconstruction of phylogenetic trees using barcodes rbcL, matK and a combination of rbcL + matK. The results showed that the sequencing process of the matoa species (P. pinnata) generated sequence lengths of 149,661 bp. The use of a combination of the two loci can better classify intra- species and inter-species.
Keyword: genome, locus, MinION, phylogenetic, Pometia pinnata

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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