Judul: Analisis kandungan hara N dan P serta Klorofil tebu transgenik IPB 1 yang ditanam di Kebun Percobaan PG Djatiroto, Jawa Timur
Abstrak: Seiring dengan peningkatan jumlah penduduk Indonesia, kebutuhan akan pangan termasuk gula terus mengalami peningkatan permintaan. Namun, seiring berjalannya waktu peranan produksi gula tidak beranjak meningkat bahkan cenderung menurun baik secara kualitas maupun kuantitas (Rosadi et al., 1996). Sebagai ilustrasi, pada tahun 2009 kebutuhan akan konsumsi gula nasional mencapai 4.85 juta ton, namun kebutuhan ini hanya dapat dipenuhi sekitar setengahnya saja (55%) oleh industri gula nasional, sedangkan sisanya dipenuhi dengan mengimpor gula dari negara lain (Sudradjat, 2010). Peningkatkan produksi gula dan peningkatan efisiensi pemupukan dapat dilakukan dengan perbaikan terhadap genetik tebu melalui rekayasa genetika dengan cara mengintroduksikan gen fitase yang diharapkan berdampak positif bagi sistem metabolisme tanaman (Santosa, 2004). Penelitian ini bertujuan untuk mengetahui kandungan unsur N dan P serta klorofil yang terkandung dalam daun 23 klon tebu transgenik IPB 1 (yang telah diintroduksi gen fitase) dan isogenik PS 851 (non-transgenik) serta menyeleksi beberapa klon terbaik tebu transgenik IPB 1. Pengambilan sampel dilakukan pada saat tebu berumur 6 bulan di Kebun Percobaan Djatiroto, Jawa Timur. Perlakuan yang diberikan pada lahan adalah dua kali pemupukan ZA sebanyak 2.5 kui/ha pada awal penanaman dan 45 hari setelah penanaman awal. Analisis jaringan untuk N dilakukan dengan metode Kjeldahl, analisis P dilakukan dengan P-Bray, analisis kandungan klorofil dilakukan dengan metode Wintermans dan De Mots (1965). Pemilihan klon terbaik menggunakan sebaran frekuensi data dengan kriteria keragaan pertumbuhan tanaman yang meliputi tinggi batang, diameter batang, jumlah ruas per batang, panjang dan lebar daun atas dan panjang dan lebar daun bawah.
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Judul: Analisis kandungan klorofil dan laju fotosintesis tebu transgenik PS-IPB 1 yang di tanam di kebun percobaan PG Djatiroro, Jawa Timur
Abstrak: Sugar cane (Saccharum officinarum Linn.) is an important industrial plant for sugar production. The productivity of this plant could be increased by introducing phytase gen. Such transgenic sugarcane that had been produced by Santosa et al. (2004), is expected to increase the efficiency of P fertilization. The objectives of this research were (1) to select best growth performance of transgenic sugar cane clones treated with P fertilization, (2) to measure of chlorophyll content and Leaf Area Index (LAI) of the selected transgenic sugar cane. Plantation of the transgenic sugar cane was conducted at the experimental station of PG Djatiroto, PTPN XI, East Java. Plantation was treated with two levels of P fertilization , i.e. 25% and 50% of optimum P fertlization (P2O5 = 92,29 ppm). Growth performance parameters of the plant that were measured including leave sizes, number of space between joints, number or stalk, stalk height, and stalk diameter. Samples of leaves for analysis of chlorophyll and LAI were collected at 3 and 6 months after plantation. The result show that not all of sugar cane transgenic clones (PS-IPB 1) has chlorophyll higher than its isogenic (PS-851). At 3 months old the clones contained chlorophyll-a higher than the isogenic are 6 clones in the test field I, and 1 clone in the test field II; while that for chlorophyll-b are 9 clones in the test field I, and 3 clones in the test field II. At 6 months old the clones contained chlorophyll-a higher than the isogenic are 10 clones the test field I, and 5 clones in the test field II; while that for chlorophyll-b are 9 clones in the test field I, and 6 clones in the test field II. In average, chlorophyll-a, chlorophyll-b, and total chlorophyll of the plants grown in the field I are higher than that in the field II. In addition, chlorophyll-b of the transgenic plant in both fields is higher than chlorophyll-a. There is no differences of Leaf Area Index (LAI) of plants grown in the field I and II, but the LAI of plants at age 6 months is significantly higher than that at age 3 months.
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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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