Notes on some plant components

Propolone A (72) was isolated in large quantities from an ethanol extract of Cuban propolis [11]. This finding and the isolation of nemorosone from C. rosea has permitted to suggest the role of this plant in the chemical composition of Cuban propolis. However, propolone A has not been reported as a component of Clusia rosea s floral resin, the main Clusia sp. distributed in Cuba. Thus, propolone A can be a derivative of nemorosone and the conversion would occur whereas the process of conservation and treatment of propolis samples and extracts are carried out. Some authors have reported that natural PBDs are unstable mainly in solutions and our experiences are in agreement with those observations. On the other hand, Porto et al. noted the structural similarities between the PBD isolated from floral resins of C. scrobiculata scrobiculatone A (63) [20] and propolone A. However, the first one has not been isolated from floral resins of C. rosea so far. 

The CPS automates error-prone tasks, such as basic step logic determination monitoring of continuously applied step and entry condition, that can minimize cognitive load on operators. The current step pane contains detailed information (e.g., variable value, component status, note and so forth) in order to accomplish each step. Basic structure for current step is flowchart and tree logic. Operator has to execute some actions to satisfy each instruction. Since the stmcture is very simple and intuitive, operators are able to understand it easily. It also provides additional information of plant system with Information Processing System (IPS) mimic CRT. 

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