metabonomics and other “omics” fields are essential science in analytical chemistry. modern analytical instruments such as proton nuclear magnetic resonance ( 1 h nmr) can be provided the great quantity of analytical information. in order to assign unknown samples, chemometrics methods recognition build classification model based on experimental data.  firstly some current strategies for regard...

A series of transition metal complexes with two thiosemicarbazide Schiff bases, 1-(4-dimethylaminobenzyl- idene)thiosemicarbazide (ABTSC) and 1-(2-pyridincarboxyl-idene) thiosemicarbazide (TCTS) were synthesized with Co(II), Ni(II), Zn(II), Cd(II) and Ag(I) salts (chloride and acetate). These complexes were characterized by different methods including proton nuclear magnetic resonance (1HNMR),...

The measurement of proton gyromagnetic ratio }'p' has been the object of an intensive experimental program for several decades [l]-[3]. The gyromagnetic ratio of the proton is defined as a resonance frequency «p divided by a magnetic field Bo [4], when a spherical water sample at 25°C is applied by a magnetic field. The ?P' for a defined pure water sample is somewhat difficult to measure becaus...

Introduction Proton-Electron Double-Resonance Imaging (PEDRI) provides a method for in vivo or ex vivo imaging of free radicals in biological tissues and living animals [1]. This technique is based on the Overhauser effect with irradiation and saturation of the electron spin system during the acquisition of a proton magnetic resonance image. An enhancement of the NMR signal of up to two orders ...

background: early diagnosis of brain tumors has significant effect on the treatment process. brain metastatic tumors are usually diagnosed following the neurological symptoms in patients or incidentally after computerized tomography (ct) scan and magnetic resonance imaging (mri) requests of the brain. objectives: implementation of a new method for being informed about the origin of brain tumors...

A series of transition metal complexes with two thiosemicarbazide Schiff bases, 1-(4-dimethylaminobenzyl- idene)thiosemicarbazide (ABTSC) and 1-(2-pyridincarboxyl-idene) thiosemicarbazide (TCTS) were synthesized with Co(II), Ni(II), Zn(II), Cd(II) and Ag(I) salts (chloride and acetate). These complexes were characterized by different methods including proton nuclear magnetic resonance (1HNMR),...

Magnetic susceptibility and proton magnetic resonance spectra are reported for the oxidized and reduced forms of the iron-sulfur protein Bacillus polymyxa ferredoxin I. The magnetic susceptibility of the oxidized form indicates antiferromagnetic exchange coupling between component iron atoms that is quantitatively similar to that observed for the clostridial ferredoxins and for the [(C(2)H(5))(...