نتایج جستجو برای: gc mass

تعداد نتایج: 504862  

2008
Arunav Kundu Thomas J. Maccarone Stephen E. Zepf I. Chun Shih Katherine L. Rhode

Studies of nearby galaxies reveal that roughly half of their low mass X-ray binary (LMXB) populations are associated with globular clusters (GCs). We have established that the LMXB hosting frequency is correlated to various GC properties such as mass and metallicity. While the X-ray luminosities of a few of the brightest LMXBs in GCs are consistent with the accreting object being a black hole (...

Journal: :iranian journal of pharmaceutical sciences 0
suleiman afsharypuor faculty of pharmacy and pharmaceutical sciences, isfahan university of medical sciences, isfahan, iran marzieh rahmany faculty of pharmacy and pharmaceutical sciences, isfahan university of medical sciences, isfahan, iran

the composition of the essential oils of two african (“white” and “yellow”) olibanums available in the commercial market of isfahan (iran) was analyzed by gas chromatography (gc) and gc-mass spectroscopy methods. the main constituents of the “white” olibanum oil were alpha-pinene (34.8%), limonene (15.9%), alphathujene (9.0%), para-cymene (7.0%), myrcene (6.2%) and sabinene (6.0%). major compon...

Journal: :Experimental oncology 2013
B I Gerashchenko N M Ryabchenko O A Glavin N K Rodionova L I Makovetska O B Ganzha M O Druzhyna V M Mikhailenko

AIM The purpose of this study is to test whether whole-body fractionated exposure of tumor-free animals to low doses of low-LET radiation (at the total delivered dose of 1.0 Gy of X-rays) is capable of potentiating growth of subsequently implanted tumor cells. MATERIALS AND METHODS Adult male rats were fractionally exposed to low doses of X-rays (10 acute exposures with 0.1 Gy each and with a...

Journal: :Talanta 2004
Gauthier Eppe Jean-François Focant Catherine Pirard Edwin De Pauw

Recent developments in trapping efficiency inside ion trap mass spectrometer permitted to lower instrument detection limit (IDL). An IDL of 200fgmul(-1) injected with a signal-to-noise ratio of 5:1 for tetrachlorodibenzo-p-dioxin (TCDD) was obtained by gas chromatography coupled to a quadrupole ion storage mass spectrometer in tandem mode (GC/MS/MS). Coupling large volume programmable temperatu...

2012
P. Abirami A. Rajendran

In this study, the bioactive compounds of Vernonia cinerea have been evaluvated using GC-MS. The chemical compositions of the whole plant methanol extract of Vernonia cinerea were investigated using Perkin-Elmer Gas Chromatography Mass Spectroscopy. GC-MS analysis of V. cinerea plant methanol extract revealed the existence of the GC-MS chromatogram of the seven peaks presented .The major compou...

Journal: :iranian journal of pharmaceutical sciences 0
mohammadreza shams-ardakani department of pharmacognosy, faculty of pharmacy, tehran university of medical sciences, tehran, iran alireza ghannadi department of pharmacognosy, faculty of pharmacy, isfahan university of medical sciences, isfahan, iran azadeh rahimzadeh department of pharmacognosy, faculty of pharmacy, isfahan university of medical sciences, isfahan, iran

the volatile oil obtained by hydrodistillation of the aerial parts of matricaria chamomilla l. (asteraceae) growing in botanical garden, isfahan university of medical sciences, iran, was investigated by gas chromatography (gc) and gc/ mass spectrometery (ms). sixty-three components were characterized, representing 86.21% of the total oil components detected. α-bisabolol oxide a (25.01%) and a-b...

Journal: :Clinical chemistry 1986
V A Soo R J Bergert D G Deutsch

We describe a quantitative screen for hypnotic-sedative drugs in which we use capillary gas chromatography with a nitrogen-phosphorus detector (GC/NPD) as the primary method and capillary gas chromatography-mass spectrometry (GC-MS) for confirmation. GC retention times of the acid-extracted underivatized drugs were stable (CVs less than 1%), and the detector response varied linearly over a 20-f...

2016
Michael A. Beasley Ignacio Trujillo

We present an analysis of archival HST/ACS imaging in the F475W (g475), F606W (V606), and F814W (I814) bands of the globular cluster (GC) system of a large (3.4 kpc effective radius) ultra-diffuse galaxy (DF17) believed to belocated in the Coma Cluster of galaxies. We detect 11 GCs down to the 5σ completeness limit of the imaging (I814=27 mag). Correcting for background and our detection lim...

Journal: :Journal of pharmacological and toxicological methods 1994
G B Baker R T Coutts A Holt

Acetylation with acetic anhydride, under both aqueous and anhydrous conditions, has been utilized to derivatize various biogenic amines and psychotropic drugs for subsequent analysis by gas chromatography (GC) or gas chromatography-mass spectrometry (GC-MS). Under basic aqueous conditions, acetic anhydride derivatizes phenols and amines but not alcohols; under anhydrous conditions, all three fu...

2005

A new product (Application 460B-00) from Agilent Technologies/WassonECE uses a 5973N GC/MSD (gas chromatograph/mass selective detector) for the determination of trace levels of impurities that are moderate-to-low carbon-content such as oxygenates, mercaptans, sulfides, arsine, and phosphine in ethylene and propylene. This work describes the performance of Application 460B-00 with respect to lin...

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