Judul: Pengembangan Kultur Primer Hepatosit Tupaia javanica Sebagai Media Isolasi dan Deteksi Virus Hepatitis B
Abstrak: Human hepatitis B virus is a major health problem worldwide which have a very narrow host range. The susceptibility of Tupaia belangeri hepatocytes primary culture has been used as an alternative in vitro model for studying hepatitis B virus infection. In this research, we proposed the usage of T. javanica hepatocytes primary culture as an in vitro model to isolate and detect hepatitis B virus from human and Hylobates moloch. Both in vitro infection of the hepatitis B virus in T. javanica hepatocytes primary culture show viral DNA replication in Real Time PCR. The result suggest that T. javanica may become a useful model for studying hepatitis B virus infecton
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Judul: Isolasi, Identifikasi dan Karakterisasi Molekular Virus Hepatitis B pada Owa Jawa (Hylobates moloch) di Indonesia
Abstrak: Hepatitis B virus (HBV) was reported not only able to infect human being, but also non-human primates, especially the great apes group such as orangutans, gorillas, chimpanzees, as well as the lesser apes from the family of Hylobatidae. Among other species within the genus, Hylobates moloch (owa jawa or silvery/ javan gibbons), which is considered as one of Indonesia’s endemic endangered species, has been reported to harbor HBV of their own strain. Analyses of HBV isolated from infected gibbons were done in this study to reveal their relatedness to the published data. Plasma samples from nine javan gibbons were obtained as part of diagnostic purpose. Those animals were previously tested positive for the presence of hepatisis B-surface antigen (HBsAg) by enzyme-linked immunosorbent assay (ELISA). DNA samples were extracted from these nine plasma samples to be used as templates for amplification of the Pre-S1 region by polymerase chain reactions (PCR) technique using semi degenerate primers that could amplify several strains of HBVs. The PCR products of 457 - 459 base pairs were then subject to restriction fragment length polymorphism (RFLP) analyses using Bst2UI enzyme to evaluate the pattern of cleaved fragments. The PCR products were sequenced for further homology analyses and to create phylogenetic tree of the sequenced data obtained from the study in comparison with published data. Two plasma samples were used as templates for whole region amplification using sets of 4 primer. The PCR products of 3192 base pairs were sequenced for further homology analyses and to create phylogenetic tree. Phylogenetic tree analyses for Pre-S1 nucleotide region and whole region showed that the javan gibbon isolates formed their own clusters, separate from the other nonhuman primate isolates.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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