Summary

NMR has revolutionized structure determination and is a technique used in a very wide range of disciplines from biology, chemistry, material science, polymers and biopolymers, to drug design, food science, etc. Although the technique has been around for more than seventy years, it is still in development, both instrumentally with higher magnetic fields, better probes, improving pulse sequences and signal manipulation, and in solid state NMR with higher spinning speeds, and in relation to improving signal to noise ratios. It is the aim to collect a number of contributions covering recent progress both with respect to techniques and to new uses of NMR in its entire range of applications.

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Topic Review
Cerebrovascular Leak and Glymphatic Obstruction in Neurodegenerative Disease
New approaches are required to successfully intervene therapeutically in neurodegenerative diseases. Addressing the earliest phases of disease, blood brain barrier (BBB) leak before the accumulation of misfolded proteins has significant potential for success.
  • 631
  • 26 Oct 2021
Topic Review
HR-MAS NMR in Plant Metabolomics
Metabolomics is used to reduce the complexity of plants and to understand the underlying pathways of the plant phenotype. The metabolic profile of plants can be obtained by mass spectrometry or liquid-state NMR. Extraction of metabolites from the sample is necessary for both techniques to obtain the metabolic profile. This extraction step can be eliminated by making use of high-resolution magic angle spinning (HR-MAS) NMR which allows to get metabolic profile directly in intact plant tissues such as intact leaves. An HR-MAS NMR-based metabolomics workflow is thus established that provide a novel platform for obtaining important information of regular metabolic network non-invasively.
  • 738
  • 14 Jul 2021
Topic Review
Microbial Conjugation Studies of Licochalcones&Xanthohumol
Microbial conjugation studies of licochalcones (1–4) and xanthohumol (5) were performed by using the fungi Mucor hiemalis and Absidia coerulea. As a result, one new glucosylated metabolite was produced by M. hiemalis whereas four new and three known sulfated metabolites were obtained by transformation with A. coerulea. Chemical structures of all the metabolites were elucidated on the basis of 1D-, 2D-NMR and mass spectroscopic data analyses. These results could contribute to a better understanding of the metabolic fates of licochalcones and xanthohumol in mammalian systems. Although licochalcone A 4′-sulfate (7) showed less cytotoxic activity against human cancer cell lines compared to its substrate licochalcone A, its activity was fairly retained with the IC50 values in the range of 27.35–43.07 μM.
  • 504
  • 12 Jul 2021
Topic Review
Imaging of Colorectal Liver Metastases
Computed tomography (CT), magnetic resonance imaging (MRI), and 18-fluorideoxyglucose positron emission tomography (18FDG-PET) are historically the most accurate imaging techniques for diagnosing liver metastases. Recently, the combination of diffusion-weighted imaging and hepatospecific contrast media, such as gadoxetic acid in MRI, have been demonstrated to have the highest diagnostic accuracy, sensitivity, and specificity for detecting liver metastases. Various recent meta-analyses have confirmed the diagnostic superiority of this combination (diffusion-weighted imaging and gadoxetic acid-enhanced MRI), especially in terms of per lesion sensitivity, as compared with CT and 18FDG-PET, even for smaller lesions (≤1 cm). However, none of the oncological guidelines have suggested the use of MRI as a first-line technique for liver metastasis detection during the staging process of oncological patients.
  • 521
  • 08 Jul 2021
Topic Review
MR-Guided Radiotherapy for Prostate Cancer
The biological features of prostate cancer as a tumor with a low alpha beta ratio have led clinicians to consider the use of higher doses per fraction, thus gaining an advantage both in terms of clinical outcomes and of logistic opportunities. In this setting, the recent introduction of MR-Linac will provide clinicians an attractive tool for the treatment of prostate cancer, by exploiting the superior soft tissue visualization combined with the possibility to daily adapt the treatment plan with the real-time anatomy of the patient.
  • 446
  • 08 Jul 2021
Topic Review
Curaxins and G-Quadruplex DNA Oligomers
Curaxins and especially the second-generation derivative curaxin CBL0137 have important antitumor activities in multiple cancers such as glioblastoma, melanoma and others. Although most of the authors suggest that their mechanism of action comes from the activation of p53 and inactivation of NF-kB by targeting FACT, there is evidence supporting the involvement of DNA binding in their antitumor activity. In this work, the DNA binding properties of curaxin CBL0137 with model quadruplex DNA oligomers were studied by 1H NMR, CD, fluorescence and molecular modeling. We provided molecular details of the interaction of curaxin with two G-quadruplex structures, the single repeat of human telomere d(TTAGGGT)4 and the c-myc promoter Pu22 sequence.
  • 636
  • 17 Nov 2021
Topic Review
Actual Symmetry of Symmetric Adducts
This review discusses molecular adducts, whose composition allows a symmetric structure. Such adducts are popular model systems, as they are useful for analyzing the effect of structure on the property selected for study since they allow one to reduce the number of parameters. The main objectives of this discussion are to evaluate the influence of the surroundings on the symmetry of these adducts, steric hindrances within the adducts, competition between different noncovalent interactions responsible for stabilizing the adducts, and experimental methods that can be used to study the symmetry at different time scales. This review considers the following central binding units: hydrogen (proton), halogen (anion), metal (cation), water (hydrogen peroxide). 
  • 679
  • 10 Feb 2022
Topic Review
Solid State NMR Spectroscopy
Solid-state NMR relaxometry has established its position in food science, including the determination of moisture content, solid fat content and much more and shown to be complementary to traditional microscopic techniques in studying the phase morphology of blended materials used in semiconductive polymer-based devices .
  • 688
  • 02 Jul 2021
Topic Review
Degradation Path of Deltamethrin
One of the most frequently and widely used pyrethroids is deltamethrin, often employed for the control of household insect pests. The presence of three chiral centers translates into eight possible different stereoisomers, with only one of them having insecticidal activity. Active deltamethrin (a-DLM) has an S configuration at the α−benzyl carbon and a 1-R-cis configuration at the cyclopropane ring.
  • 539
  • 25 Jun 2021
Topic Review
MRI for Evaluating DKD Noninvasively
Renal magnetic resonance techniques provide noninvasive information on renal volume, function, metabolism, perfusion, oxygenation, and microstructural alterations, without the need for exogenous contrast media.
  • 556
  • 10 Jun 2021
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