the essential oils of zataria multiflora (labiatae) from four regions of iran were investigated by glc and gc-ms methods. the main constituents were carvacrol, thymol, linalool and p-cymene. the percentage of the constituents (in dry and wet plant) of different regions have been compared. antibacterial and antifungal effects of these essential oils have been studied. the essential oil with high...

To determine the period of harvest that optimizes the antimicrobial activities of the essential oil of Ocimum gratissimum L. from Benin, aerial plant parts were collected at two vegetative stages (pre- and full-flowering) and three sampling times (7 am, 1 pm, and 7 pm). Extraction by hydrodistillation yielded between 0.65 and 0.78% of essential oils. Characterization of the oils by GC-FID and G...

All environments inhabited by humans contain microbes. The detection and elimination of harmful fungi and bacteria in closed system environments such as spacecraft is of vital importance. Biological waste products of microbes can cause “sick building syndrome,” structural damage, and pose a fire hazard. Traditional means of detecting and quantifying these microbes, GC/MS and HPLC, are too bulky...

The synthesis, oxidation reactions and transition metal complexes of a new ferrocenyl-bisphosphine, [Fe{C5H4P(C?CH)2}2] (1), are described. reaction bis(dichlorophosphino)ferrocene with four equivalents ethynylmagnesium bromide resulted in the formation 1 76% yield. between 1, aqueous H2O2 or elemental sulphur produced bis(oxide) bis(sulfide) derivatives, [Fe{C5H4P(E)(C?CH)2}2] (2 E = O, 3 S). ...

Metal catalysts based on Ni, Co, and Pd supported SiO2 were evaluated in the catalytic pyrolysis of waste tires using experiments coupled to gas chromatography/mass spectrometry (Py–GC/MS) thermogravimetric analysis with Fourier Transform Infrared spectrometer (TGA–FTIR) techniques. The effect temperature nature metals product distribution reaction pathways was determined. Catalytic promoted ar...

A fast and simple method based on ultrasound-assisted emulsification microextraction (USAEME) was developed for the analysis of volatile compounds in wines. full factorial 24 screening design built to investigate main factors affecting extraction components, namely volume solvent, sonication time, salt content, pH. Then, with significant effects were optimized using an I-optimal design. The opt...

In the title complex, [RuSn(2)(C(10)H(14))Cl(6)(C(6)H(15)O(3)P)], the Ru-Sn bond lengths [2.5619 (3) and 2.5669 (3) Å] are about 0.3 Å shorter than the sum of the covalent Ru and Sn radii (1.46 + 1.39 = 2.85 Å), in line with other structurally characterized arene ruthenium trichlorido-stannyl derivatives. The Ru(II) atom is surrounded by a para-cymene, a triethylphosphite and two trichloridosta...

Abstract Ruthenium(II)-catalyzed enantioselective C–H functionalization reactions of sulfoximines with sulfoxonium ylides are described. The combination [RuCl2(p-cymene)]2 and a pseudo-C 2-symmetric binaphthyl monocarboxylic acid furnished the S-chiral products in 76:24 to 92:8 er.