The asymmetric unit of the title organic-inorganic molecular salt, C6H18N2 (2+)·SiF6 (2-), consists of one anion and one cation together with half of each of two cations and two anions located on inversion centres. The SiF6 (2-) octa-hedral anions are arranged to form sheets parallel to (011), which are linked into a three-dimensional network by the organic cations through N-H⋯F hydrogen bonds.

Egg parasitoids foraging for suitable hosts scattered in the environment rely mainly on chemical cues. Elucidating ecology of natural enemies is important development effective and successful strategies conservation biological control. In this context, host cuticular hydrocarbons, which are exploited by several species egg as contact kairomones, could be used to retain them providing informatio...

Methods are reported for the manual spectrophotometric or fluorometric estimation of tocopherol in human cerebrospinal fluid. The fluid is centrifuged, an equal volume of ethanol is added, and the tocopherol is extracted with hexane, which is then used for the direct estimation by fluorometry. The fluorescence of tocopherol is significantly affected by the proportion of ethanol in the hexane so...

Abstract: In this study, the liquid-liquid equilibria of the mixtures consisted of ethanol, water, and the main components of gasoline fuel: pentane, hexane, and cyclohexane were experimentally determined. This study is related to the phase behavior when water in atmosphere is absorbed into ethanol + gasoline fuel (gasohol) and then possibly separates into two liquid phases in an automobile fue...

Indonesian people had long used plants as traditional medicine. In addition to maintaining health, medicine was in great demand and prevents disease. We often encounter syzygium polyanthum leaves a complement tamarind pepes, which were believed act preservative. This study aimed determine qualitatively bay leaf extract an antimicrobial, Salmonella typhi. Methanol extraction of polyantum would b...

n-Hexane and methyl n-butyl ketone share a common metabolite, 2,5-hexanedione, a potent neurotoxin. Neurotoxic effects to both peripheral and central nervous systems may occur after occupational exposure or recreational abuse of n-hexane. Initial clinical manifestations include numbness and tingling sensation in the toes and fingers, followed by progressive weakness and areflexia, particularly ...

Because of their potential energy savings, dividing-wall columns (DWCs) have been viewed as an interesting alternative to the use of sequences based on conventional distillation columns. The energy savings, however, must be supported by suitable controllability properties for a proper operation. In this study we use a design methodology to optimize the gains of the Takagi−Sugeno fuzzy controlle...

The urinary excretion of the n-hexane metabolite 2,5-hexanedione (HD) was determined in four shoe factory workers during four workingdays that were preceded by four free days and followed by two free days. The correlation between excretion of HD and the n-hexane concentrations in the workroom air was evaluated. The air concentrations of n-hexane and those of acetone, toluene, and other organic ...

tomato fusarium wilt, caused by fusarium oxysporum f. sp. lycopersici (fol), is one of the most important diseases of tomato in iran and in the whole world. recently, in order to reduce hazardous effects of chemical pesticides, these days, attempts have been made to use safer methods for controlling plant pathogens. therefore, using antifungal plant materials has been highly regarded during pas...

backgrand: the genus ajuga , belongs to lamiaceae family, is one of the exclusive subspecies in the flora of iran. the plants of this genus are used traditionally for treatment of joints pain, gout, jaundice, and as insecticide. methods: larvicidal activity of methanol 80% extract and partition fractions of hexane, chloroform, and ethyl acetate obtained from aerial parts of ajuga chamaecistus s...