Judul: Kloning gen CYP71AV asal Artemisia annua di dalam Escherichia coli DH-5α
Abstrak: Infection of malaria caused 1.7-2.5 million people die each year. Artemisia annua contains artemisinin compounds effective to eradicate malaria types that are resistant to quinine and chloroquine. CYP71AV is a gene that has critical role in the biosynthesis of artemisinin by catalyzing the oxidation of intermediate products Amorpha-4,11-diene, which are highly produced in the biosynthesis of artemisinin. This study aimed to clone the CYP71AV gene through recombinant DNA technology. CYP71AV gene from total cDNA was amplified using specific primers. CYP71AV gene was inserted into pGEM-T Easy plasmid. The recombinant plasmid containing CYP71AV gene introduced into Escherichia coli strain DH5-α. CYP71AV gene sequencing produce approximately 1571 base pairs encoding 523 amino acids. Local alignment analysis of nucleotides with CYP71AV of several species listed in GeneBank showed that the cDNA CYP71AV have 98% similarity with complete cds A.annua (JQ254992.1). Domain analysis showed that the CYP71AV gene has three conserved domain
Keyword: Bogor Agricultural University (IPB), Artemisia annua., clone, cDNA CYP71AV

Judul: Isolasi dan Kloning pada Escherichia coli Gen AaWRKY1 Artemisia annua L
Abstrak: Artemisia annua WRKY1 (AaWRKY1) gene encodes a protein WRKY a transcriptional activator of Amorpha-4,11-diene synthase (ADS). The overexpression farnesil diphosphate AaWRKY1 genes can increase levels of artemisinin. This study was aimed to isolate an AaWRKY1 gene from Artemisia annua L. Amplification of AaWRKY1 gene was done by PCR (Polymerase Chain Reaction) technique using specific primer pairs and cDNA as a template. Subsequently, AaWRKY1 gene fragment was cloned into a cloning vector pJET 1.2 using T4-ligase and transformed into competent cell Escherichia coli DH5α through heat shock method, and grown on LB agar medium containing ampicillin. Result showed that amplification with specific primers of AaWRKY1 gene generated an amplicon fragment of ± 1500 bp. The gene fragment was succesfully cloned into pJET 1.2 and transformed into cells of E. coli DH5α. Confirmation of recombinant clone was carried out using colony PCR to obtain recombinant colonies.
Keyword: Bogor Agricultural University (IPB), pJET 1.2 Vector, colony PCR, cloning, AaWRKY1 gene, Artemisia annua L

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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