نتایج جستجو برای: proton shift

تعداد نتایج: 201000  

Journal: :The journal of physical chemistry. B 2016
Stephen K Davidowski Forrest Thompson Wei Huang Mohammad Hasani Samrat A Amin C Austen Angell Jeffery L Yarger

The ionicity and transport properties of a series of diethylmethylamine (DEMA) based protic ionic liquids (PILs) were characterized, principally utilizing nuclear magnetic resonance (NMR) spectroscopy. PILs were formed via the protonation of DEMA by an array of acids spanning a large range of acidities. A correlation between the (1)H chemical shift of the exchangeable proton and the acidity of ...

2018
Basant K Puri Mary Egan Fintan Wallis Philip Jakeman

AIM To investigate the repeatability of proton magnetic resonance spectroscopy in the in vivo measurement of human cerebral levels of choline-containing compounds (Cho). METHODS Two consecutive scans were carried out in six healthy resting subjects at a magnetic field strength of 1.5 T. On each occasion, neurospectroscopy data were collected from 64 voxels using the same 2D chemical shift ima...

Journal: :The journal of physical chemistry. B 2009
Yu Suzuki Rui Takahashi Tadashi Shimizu Masataka Tansho Kazuo Yamauchi Mike P Williamson Tetsuo Asakura

A combination of solid state 1H NMR chemical shift measurements and empirical chemical shift calculations has been used to interpret 1H solid state chemical shifts of a model peptide (Ala-Gly)15 for the crystalline domain of Bombyx mori silk fibroin in silk I and silk II structures, including a treatment of both intra- and intermolecular arrangements. Silk I and silk II are the structures of si...

F. Maroufkhani, S.M.M. Abtahi, T. Kakavand,

Background: The present study aimed to investigate the equivalent dose in vital organs, including heart and lung, due to secondary particles produced during breast proton therapy. Materials and Methods: The numerical ORNL female-phantom was improved and simulated using the Monte Carlo MCNPX code. The depth-dose profile of proton beams with different energies was simulated. The proper energy ran...

Journal: :iranian journal of radiation research 0
y.j. go college of veterinary medicine, kyungpook national university, korea j.h. shin college of veterinary medicine, kyungpook national university, korea k.s. jeong college of veterinary medicine, kyungpook national university, korea s.j. park college of veterinary medicine, kyungpook national university, korea s.h. kim college of veterinary medicine, chonnam national university, korea s.y. ryu college of veterinary medicine, chungnam national university, korea

background: the purpose of this paper is to establish an easy and reliable biodosimeter protocol to evaluate the biological effects of proton beams. materials and methods: human peripheral blood lymphocytes were irradiated using proton beams (let: 34.6 kev μm−1), and the chromosome aberrations induced were analyzed using cytokinesis-blocked (cb) micronucleus (mn) assay. to determine the efficie...

Journal: :International journal of advanced research 2022

We are paying a close attention to this question how decided the fate of all protons generated in mitochondria 50- 80 trillion cells (now by us named 1-7 stages proton conductance) needing another special structures, owing which have been subjected harmless consequences mecchanisms as maintaining serum and cell pH-7,4, packaging inside erythrocyte membrane surroundings. In connection with this,...

Alireza Karimian, Marzieh Tavakol Sayyed Mojtaba Mostajab Aldaavati

Introduction Proton therapy is used to treat malignant tumors such as melanoma inside the eye. Proton particles are adjusted according to various parameters such as tumor size and position and patient’s distance from the proton source. The purpose of this study was to assess absorbed doses in eyes and various tumors found in the area of sclera and choroid and the adjacent tissues in radiotherap...

An improved M.I.T. bag model with hyper central interaction is used to calculate the charge radius for proton containing u and d quarks. We present a theoretical approach to the internal structure of three-body hyper central interacting quarks in a proton, in which we take proton as a bag. We discuss a few of results obtained using a six-dimension potential, which is attractive for small separa...

Journal: :Magnetic resonance in medicine 1997
W I Jung A Staubert S Widmaier T Hoess M Bunse F van Erckelens G Dietze O Lutz

Proton decoupled 31P NMR spectroscopy of the occipital brain of healthy volunteers was performed with a 1.5 T whole-body imager. By use of two-dimensional chemical-shift imaging in combination with slice-selective excitation well resolved localized spectra (38 ml) were obtained within 34 min from which the homonuclear 31P-31P J-coupling constants of ATP could be determined: J(gammabeta) = 16.1 ...

Journal: :Angewandte Chemie 2014
Mark D Struble Courtney Kelly Maxime A Siegler Thomas Lectka

Reported herein is the synthesis of a molecule containing an unusually strong hydrogen bond between an OH donor and a covalent F acceptor, a heretofore somewhat ill-defined if not controversial interaction. This unique hydrogen bond is to a large extent a product of the tight framework of the rigid caged system. Remarkably, the interaction shows little to no perceptible shift in the OH stretch ...

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