Judul: Optimacy of Pseudomonas spp. Inoculant production and their viability in peat
Abstrak: This research used eight strains of Pseudomonas sp which were able to promote plant growth and induce plant health and resistance against phytophatogenic fungi. The aim of this research were to know optimation of inoculant production, encompassing pH and alternative medium optimation, and cell viability test in peat soil as a carrier. From eight strains of Pseudomonas sp. which were used, there were two groups of bacteria with different of optimum pH, which are pH 7.0 for CRB 17, CRB 12, CRB 24, CRB 46, CRB 47, CRB 5, and pH 6.5 for CRB 49 and CRB 56. Eight strains of Pseudomonas sp. which were used, could grow nicely in alternative media. Three bacteria which had high cell mass was CRB 17, 46, 49 and they were use either as single inoculants or mix inoculants with peat soil as carrier. Either as single inoculants or mix inoculants had a nice viability in peat soil as a carrier. High viability respon was CRB 46 on zero week, which was 2.01×109 CFU and low viability respon CRB 46+49 on fourth week, which were 6.7×108 CFU.
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Judul: Uji Efektivitas Bakteri Pemicu Tumbuh Tanaman Penyusun Pupuk Hayati Provibio.
Abstrak: The use of biofertilizers is expected to improve soil health, stimulate plant growth and increase crop production. In connection with the utilization of microbial biofertilizers, quality testing needs to be done periodically to maintain the quality of biofertilizers. This study aims to evaluate the effective of plant growth promoting bacteria at Provibio biofertilizer. The stages of this research are strains testing of plant growth promoting bacteria which includes purification, testing the potency of bacteria, pathogenicity test, antagonism test, characterization and identification, the calculation of the total population for each strain of bacteria in mixed cultures. The results show that plant growth promoting bacteria inoculan real in increase plant growth, but does not significant effect in increasing root length, wet weight and dry weight of plant compared to controls. ICBB 6099 isolate potentially pathogenic to humans or animals. ICBB 6088 shown antagonistic characteristic on ICBB 6099 isolate when combined in vitro. ICBB 6099 isolate has similar characteristics to the genus Listeria. Whereas ICBB 8767 isolate which has similar characteristics to the genus Phenylobacterium and Aeromicrobium. ICBB 8767 has highest density of populations in the mixed cultures.
Keyword: effectivity test, pathogenicity, identification, plant growth promoting bacteria, antagonism

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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