Judul: Efek Damping pada Soliton DNA Kuintik Berdasarkan Prinsip Variasi
Abstrak: DNA is one of the macromolecules that has very important roles in biological system of organism. Some of the Activities of breather DNA are transcription and replication. DNA transcription that related to DNA denaturation bubble, is influenced by viscosity of medium. DNA breathing can be set by the QNLS equation with a finite set of parameters. The purpose of this research is to study the dynamics of parameters variation of damped QNLS equation that describes the influence of surrounding medium to DNA soliton. Variation parameters of the QNLS equation were obtained using the variational method, where damping is considered as a perturbation. Damping factor causes a significant reduction in amplitude and widening of DNA soliton’s wave. Damping factor has also shown the existence of the change in the number of nucleotides that are involved in the process of DNA denaturation.
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Judul: Dinamika Soliton DNA Kuintik dengan Koefisien Dispersi dan Nonlinearitas Bergantung Ruang Berdasarkan Prinsip Variasi
Abstrak: Deoxyribonucleic acid is one of the most important biomolecules in the cell and has an important function in transferring genetic information. The double helix structure in DNA is indeed very complex especially when it is related to the biological process such as DNA transcription. In the initial process of transcription, the bubbling denaturation, a process with small amplitude will keep continuing as far as the denaturation process keeps propagating along the DNA strain which then allows the denaturation of the hydrogen bond and the forming of the denaturation wave, occured. The aim of this research is to describe the mechanism of bubling denaturation in DNA with the great amplitude which is stated in the QNLS equation in which the dispersion and nonlinearity coefficient dependent spaces based on the principle of variation. The profiles examined, show the increasing of velocity of DNA strain if the dispersion effect is larger. If the nonlinearity increases, then the DNA denaturation comprises only a few of nucleotides, but does not affect the velocity of the DNA strain itself.
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Judul: Rencana Peremajaan Tanaman Karet (Hevea brasiliensis: muel, Agr) di Kebun Gunung Pamela PT Perkebunan IV Gunung Pamela Tebing Tinggi Deli Sumetera Utara Tahun 1982
Abstrak: Dalam rangka meningkatkan produksi tanaman pangan, tanaman ekspor, penghasilan petani dan untuk meningkatkan dukungan yang kuat terhadap pembangunan industri maka pemerintah masih tetap menitik beratkan program pembangunannya di sektor pertanian yang lebih terarah dan terpadu. Subsektor perkebunan merupakan salah satu bagian dari sektor pertanian yang mempunyai arti penting dalam perekonomian Indonesia, karena subsektor ini dapat menghasilkan produksi yang bernilai ekspor tinggi. Devisa yang didapat dari ekspor hasil-hasil subsektor perkebunan setiap tahun mengalami kenaikan yang cukup menggembirakan, baik secara keseluruhan maupun perkomoditi pada umumnya (Anonymous, 1978). Karet (Hevea brasiliensis Muel. Arg) sebagai salah satu komoditi ekspor masih memegang peranan teratas dalam urutan komoditi ekspor perkebunan Indonesia.
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