Nuclear magnetic resonance

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  • Lecture Organic chemistry - Chapter 10: Nuclear magnetic resonance (NMR) spectroscopy. In this chapter, the following content will be discussed: What is spectroscopy? General spectrometer, the chemical shift δ, complex splitting patterns,...and other contents.

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  • NMR is an experiment in which the resonance frequencies of nuclear magnetic systems are investigated. NMR always employs some form of magnetic field (usually a strong externally applied field B0) NMR is a form of both absorption and emission spectroscopy, in which resonant radiation is absorbed by an ensemble of nuclei in a sample, a process causing detectable emissions via a magnetically induced electromotive force.

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  • Since its first implementation by Lauterbur [1], Magnetic Resonance Imaging (MRI) has become an important noninvasive imaging modality. MRI has found a number of applications in the fields of biology, engineering, and material science. Because it provides unique contrast between soft tissues (which is generally superior to that of CT) and high spatial resolution, MRI has revolutionized diagnostic imaging in medical science. An important advantage of diagnostic MRI as compared to CT is that the former does not use ionizing radiation....

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  •  NMR in solids, like solution-state, relies on the behavior of nuclear spin energy levels in a magnetic field. However, the interactions that affect NMR spectra act differently.  In liquids, molecules reorient and diffuse quickly, leading to narrow isotropic resonances.  In solids, the fixed orientation of individual crystallites leads to a range of resonance frequencies for anisotropic interactions.

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  • Acta Veterinaria Scandinavica Research Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: Proton nuclear magnetic resonance spectroscopy based investigation on propylene glycol toxicosis in a Holstein cow...

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  • Chapter 13 - Nuclear magnetic resonance spectroscopy. In this chapter, students will be able to understand: Use the chemical shifts, splitting patterns, and integrations shown in a proton NMR spectrum to propose structures for possible compounds; use the number of peaks and their chemical shifts in a 13C NMR spectrum to determine the number of types of carbon atoms in the compound and what functional groups they might represent;...

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  • The growth of magnetic resonance imaging (MRI) as a tool for studying brain function, as opposed to its more traditional role as a tool for studying brain anatomy and pathology, has been quite remarkable over the past decade. This has been driven in large measure by an appreciation of the considerable potential for functional magnetic resonance imaging (fMRI) to increase our understanding of how the human brain works, both in the normal and diseased states.

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  • Writing and rewriting a text such as Medical Imaging Physics over several editions presents two challenges. The first is to keep the information fresh and relevant. This is a particular challenge in medical imaging, because the field is evolving so rapidly. The third edition of this text was published in 1992, just 10 short years ago. Yet in that text no mention was made of topics such as photodiode or direct conversion digital x-ray imagers; digital mammography; digital fluoroscopy; power Doppler ultrasound; functional magnetic resonance imaging; elastography; or helical CT scanning.

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  • MRI - Hình cộng hưởng từ (MRI/ Magnetic reconance imaging): Hình cộng hưởng hạt nhân (NMRI/ Nuclear magnetic resonance imaging). Lịch sử MRI: 1940: Felix Block + Edward Furcell. 1971: Raymond Damadian. 1972: Hounsfield - CT.

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  • Giới thiệu về lịch sử phát triển của chụp cắt lớp cộng hưởng từ hạt nhân: Chụp cắt lớp cộng hưởng từ (Magnetic Resonance Imaging-MRI) là một kỹ thuật tạo ảnh thường được sử dụng chủ yếu trong y học chẩn đoán để tạo ra các ảnh có chất lượng cao về cấu trúc bên trong cơ thể của con người.MRI dựa trên cơ sở nguyên lý cộng hưởng từ hạt nhân (Nuclear Magnetic Resonance-NMR),một kỹ thuật phân tích phổ sử dụng trong nghiên cứu khoa học...

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  • saprophyte thực vật hoại sinh saprophytic (thuộc) thực vật hoại sinh saprotrophy (sự) hoại sinh, đời sống hoại sinh SAR viết tắt của Systemic Acquired Resistance SAR by NMR kỹ thuật SAR by NMR (tạo t−ơng tác hoạt tính cấu trúc Structure-Activity Relationship - bằng cộng h−ởng từ hạt nhân - Nuclear Magnetic Resonance) sarcodic (có) dạng nạc, (có) dạng thịt Sarcodina lớp Trùng chân rễ, lớp Trùng chân giả sarcodous (có) nạc, (có) thịt sarcoid (có) dạng nạc, (có) dạng thịt sarcolemma màng cơ sarc...

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  • Hình cộng hưởng từ (MRI/ Magnetic resonance imaging) • Hình cộng hưởng từ hạt nhân (NMRI/ Nuclear magnetic resonance imaging) .Lịch sử MRI 1940: Felix Block+ Edward Furcell 1971: Raymond Damadian 1972: Hounsfield- CT. 1973: Paul C Lauterbur thu hình ảnh NMR (của mẫu nước). 1977: Damadian thu được hình ảnh NMR cơ thể

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  • The most widely used analytical separation technique for the qualitative and quantitative determination of chemical mixtures in solution in the pharmaceutical industry is high-performance liquid chromatography (HPLC). However, conventional detectors used to monitor the separation, such as UV, refractive index, fluorescence, and radioactive detectors, provide limited information on the molecular structure of the components of the mixture. Mass spectrometry (MS) and nuclear magnetic resonance (NMR) are the primary analytical techniques that provide structural information on the analytes.

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  • In this study, structural features of Tricholoma matsutake polysaccharide (TMP-A) were investigated by a combination of infrared (IR) spectra, gas chromatography–mass spectrometry (GC–MS), nuclear magnetic resonance (NMR) spectroscopy. The results indicated that TMP-A had a backbone of 1,4-- d-glucopyranose residue which branches at O-6 based on the experimental results. The branches were mainly composed of an (1→3)--d-galactopyranose residue, and terminated with -d-xylopyranose residue.

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  • Since the subject of nuclear magnetic resonance (NMR) was awarded its first Nobel Prize in 1952 due to its successful detection by Bloch and Purcell in 1945, the technology and its applications have developed tremendously. The first two decades were focused on technical developments of instrumentation and methodologies to apply to the structure determination of compounds. During the late 1970s, several research groups developed modifications of NMR probes to convert them to an online mode for the analysis of sample mixtures....

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  • Both infrared and Raman spectroscopy are extremely powerful analytical techniques for both qualitative and quantitative analysis. However, neither technique should be used in isolation, since other analytical methods may yield important complementary and/or confirmatory information regarding the sample. Even simple chemical tests and elemental analysis should not be overlooked and techniques such as chromatography, thermal analysis, nuclear magnetic resonance, atomic absorption spectroscopy, mass spectroscopy, ultraviolet and visible spectroscopy, etc.

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  • Metabolomics (or metabonomics) is metabolite profil- ing, measuring the real outcome of the potential changes suggested by genomics and proteomics. Metabolomics investigates regulation and metabolic fluxes in individual cells or cell types. Metabonomics combines the power of high-resolution nuclear magnetic resonance with statistical data analysis of in vivo metabolite patterns. This technique enables rapid screening for xenobiotic toxicity, disease state, drug efficiency, nutritional status and even gene function in the “whole” organism. (Nicholson et al., 2002).

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  • The solution structure of a synthetic mutant type I antifreeze protein (AFP I) was determined in aqueous solution at pH 7.0 using nuclear magnetic resonance (NMR) spectroscopy. The mutations comprised the replacement of the four Thr residues by Val and the introduction of two additional Lys-Glu salt bridges. The antifreeze activity of this mutant peptide, VVVV2KE, has been previously shown to be similar to that of the wild type protein, HPLC6 (defined here as TTTT).

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  • Optimal use of genome sequences and gene-expression resources requires powerful phenotyping platforms, including those for systematic analysis of metabolite composition. The most used technologies for metabolite profiling, including mass spectral, nuclear magnetic resonance and enzyme-based approaches, have various advantages and disadvantages, and problems can arise with reliability and the interpretation of the huge datasets produced. These

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  • The lipopolysaccharide (LPS) ofChlamydia trachomatis serotype E was isolated from tissue culture-grown element-ary bodies and analyzed structurally by mass spectrometry and 1 H, 13 Cand31 P nuclear magnetic resonance. The LPS is composed of the same pentasaccharide bisphosphate aKdo-(2–8)-aKdo-(2–4)-aKdo-(2–6)-bGlcN-4P-(1–6)-aGlcN-1P (Kdo is 3-deoxy-a-D-manno-oct-2-ulosonic acid) as reported forC. trachomatisserotype L2[Rund,S.,Lind-ner,B.,Brade,H. and Holst,O. (1999)J. Biol. Chem.274, 16819–16824].

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