(12E,14E,17E)-11-Hydroxy-12,14,17-dodecatrienoic acid was isolated from the stems of Ilex integra and its structure was determined on the basis of the spectroscopic data of its methyl ester.

The present study focused on doing a survey about the current state of the art of applying the RBI (Risk Based Inspection) methodology on pressure safety valves (PSVs) in the process industry, as well as, analyzing the reliability of applying the Weibull distribution according to standard API RP 581 and determining an optimum inspection interval of PSVs. From the maintenance reports data of two...

Abstract The strength of the jacket substructure on a fixed offshore platform is dictated by tubular connecting leg and braces. accuracy static calculation joint very important to ensure integrity structure during its operation. Therefore, as Recommended Practice, API RP 2A WSD always regularly was updated based results latest research obtain more accurate in analysis joint. This paper discusse...

Leptolstatin, a product from Streptomyces sp. SAM1595, is a gap phase-specific inhibitor of the mammalian cell cycle. Physico-chemical properties and spectrometric analyses showed that the structure of leptolstatin is (2Z,6E,8Z,12E,14E,22E)-19,24-dihydro xy-8,10,14,16,18,20,22-heptamethyl-17-oxo-2 , 6,8,12,14,22-tetracosahexaen-5-olide.

The increasing significance of oligonucleotides as therapeutic agents necessitates a high level of quality control. In such protocols, chromatographic analysis of crude and final active pharmaceutical ingredients (API) is necessary to ensure the detection of contaminants at concentration levels down to trace amounts relative to the drug. A combination of chromatographic techniques, in particula...

Offshore jacket-type towers are steel structures designed and constructed in marine environments for various purposes such as oil exploration and exploitation units, oceanographic research, and undersea testing. In this paper a newly developed meta-heuristic algorithm, namely Cyclical Parthenogenesis Algorithm (CPA), is utilized for sizing optimization of a jacket-type offshore structure. The a...

Molybdenum complexes with the general formula Mo(NR)(CHR')(OR″)(Cl)(MeCN) (R = t-Bu or 1-adamantyl; OR″ = a 2,6-terphenoxide) recently have been found to be highly active catalysts for cross-metathesis reactions between Z-internal olefins and Z-1,2-dichloroethylene or Z-(CF3)CH═CH(CF3). In this paper we report methods of synthesizing new potential catalysts with the general formula M(NR)(CHR')(...

Tujuan dari penelitian ini adalah untuk mencapai pengurangan biaya dan peningkatan kualitas di Industri Manufaktur Kereta Api dengan menerapkan tahap define, measure, analyze, improve and control (DMAIC) Six Sigma. Penerapan metode DMAIC dilakukan sebuah perusahaan manufaktur komponen kereta api Indonesia yang memproduksi Single Part Side Frame sebagai objek penelitian. Penyebab tingginya cacat...