We present a simple model for the host mass dependence of galaxy nucleation fraction ($f_{nuc}$), galaxy's nuclear star cluster (NSC) and in its surviving globular clusters ($M_{GC,obs}$). Considering orbital evolution GC potential, we define critical limit ($M_{GC,lim}$) above which can simultaneously in-spiral to centre due dynamical friction survive tidal dissolution, build up NSC. The analy...

Gas chromatography-mass spectrometry (GC-MS) was used to detect 2-docosanol, a secondary alcohol characteristic of Mycobacterium xenopi, in 7 of 10 analyzed drinking water samples culture positive for that species. GC-MS was also used to detect tuberculostearic acid. Both of these chemical markers were analyzed as halogenated derivatives in the negative-ion-chemical-ionization mode. The numbers...

The most effective methods of analysis of organic compounds in biological fluids are coupled chromatographic techniques. Capillary gas chromatography/mass spectrometry (GC-MS) allows the most efficient separation, identification and quantification of volatile metabolites in biological fluids. Liquid chromatography-mass spectrometry (LC-MS) is especially suitable for the analysis of non-volatile...

The essential oils of two plants of the genus Bunium called the common name "Zireh" in Persian have been analyzed using GC, GC/MS and 13C NMR spectroscopy. The oils were subjected to antibacterial activity tests. The essential oils have been extracted using hydro-distillation method. The Oils were subjected to analytical GC and GC/MS. The components of the oils were identified using GC retentio...

Direct gas chromatographic (GC) analysis of thermally labile N-carbamates is studied by using fast GC with cold on-column injection. With the greatly reduced injection temperature, short column lengths, high flow rate, and fast temperature-programming rate, the exposure of carbamates to high temperature is reduced and degradation can be avoided. Nine N-carbamates in EPA Method 531 are eluted wi...

In this study, star anise (Illicium verum) essential oils (SAEOs) were extracted by hydrodistillation (HD), ethanol solvent extraction (ESE), supercritical CO2 (SCD) and subcritical (SE) via electronic nose (E-nose), gas chromatography-mass spectrometry (GC-MS), GC-ion mobility (GC-IMS). GC-MS GC-IMS used to identify the volatile compounds, was also determine their concentrations. Principal com...

Because of the growing number analysis scenarios involving complex samples, comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC×GC–TOF-MS) is now a prominent technique for characterization. However, limitations on time, expenses, and sample quantities, as well need specialized expertise in comparative analysis, can prevent discovery analytes that d...

The liquid product obtained via the biomass flash pyrolysis is commonly called bio-oil or pyrolysis oil. Bio-oils can be used as sources for chemicals or as fuels, primarily in mixtures or emulsions with fossil fuels. A detailed chemical characterization of bio-oil is necessary to determine its potential uses. Such characterization demands a powerful analytical technique such as comprehensive t...

We present a study of the globular cluster (GC) systems of nearby elliptical and S0 galaxies at a variety of wavelengths from the X-ray to the infrared. Our analysis shows that roughly half of the low mass X-ray binaries (LMXBs), that are the luminous tracers of accreting neutron star or black hole systems, are in clusters. There is a surprisingly strong correlation between the LMXB frequency a...

       The volatile constituents of aerial parts of Euphorbia aellenii Rech.f. and E. microsciadea Boiss. were analyzed by gas chromatography (GC) and GC-mass spectrometry (MS) methods. The main volatile constituents of E. aellenii were phytol isomer (47.3%), camphene (31.9%) and caryophyllene oxide (20.6%), while the major volatile components of <em...