Search results for "label"
showing 10 items of 797 documents
8-Azido-adenosine 5'-triphosphate as a Photoaffinity Label for Bacterial F1 ATPase
1978
1. 8-Azido-adenosine 5'-triphosphate (n83ATP) is a suitable photoaffinity label for F1 ATPase from Micrococcus luteus. The nucleotide is a substrate in the presence of bivalent cations and inhibits the enzyme irreversibly upon irradiation with ultraviolet light above 300 nm. 2. More than 80% of the label is covalently bound to the beta subunits in the presence of bivalent cations. Labeling and inactivation is decreased by protection with ADP, ATP or adenyl-5'-yl imidodiphosphate. To a much smaller degree the alpha subunits also become labeled. 3. n83AMP does not specifically bind to the beta subunits upon irradiation. Like n83ATP and n83ADP, it also labels the alpha subunits to a small exte…
Spin‐Labeled Heparins as Polarizing Agents for Dynamic Nuclear Polarization
2010
A potentially biocompatible class of spin-labeled macromolecules, spin-labeled (SL) heparins, and their use as nuclear magnetic resonance (NMR) signal enhancers are introduced. The signal enhancement is achieved through Overhauser-type dynamic nuclear polarization (DNP). All presented SL-heparins show high 1 H DNP enhancement factors up to E=-110, which validates that effectively more than one hyperfine line can be saturated even for spin-labeled polarizing agents. The parameters for the Overhauser-type DNP are determined and discussed. A striking result is that for spin-labeled heparins, the off-resonant electron paramagnetic resonance (EPR) hyperfine lines contribute a non-negligible part…
Quantification and classification of high-resolution magic angle spinning data for brain tumor diagnosis.
2007
The goal of this work is to propose a complete protocol (preprocessing, processing and classification) for classifying brain tumors with proton high-resolution magic-angle spinning ((1)H HR-MAS) data. The different steps of the procedure are detailed and discussed. Feature extraction techniques such as peak integration, including also the automated quantitation method AQSES, were combined with linear (LDA) and non-linear (least-squares support vector machine or LS-SVM) classifiers. Classification accuracy was assessed using a stratified random sampling scheme. The results suggest that LS-SVM performs better than LDA while AQSES performs better than the standard peak integration feature extr…
Synthesis and characterization of biotinylated and photoactivatable neuroleptics. Novel bifunctional probes for dopamine receptors
1992
Abstract We have synthesized and characterized a series of novel derivatives of established antagonists of the neurotransmitter dopamine, i.e. butyrophenones, hexahydrocarbolines and phenothiazenes. All derivatives were biotinylated, some of them carried an additional (photoactivatable) azido group. In the case of butyrophenones, the structural modifications were introduced at the aliphatic keto group and/or the heterocyclic ring system, both modifications resulting in significant decreases in binding affinity to dopamine D 2 and dopamine D 1 receptor subtypes. Biotinylation of hexahydrocarbolines significantly increased their binding affinity to D 1 receptors, with the affinity for D 2 rec…
Dynamics of the biosynthesis of methylursubin in plant cells employing in vivo 13CNMR without labelling.
1995
Abstract In vivo NMR experiments with a digital 600 MHz instrument, exploiting the natural abundance of 13C, allowed us for the first time to follow the biosynthesis of the newly detected glycoside, methylursubin ( 4- methoxyphenyl -O-β- d -primeveroside ), from 4-methoxyphenol through the intermediate methylarbutin in cell suspensions of the Indian medical plant, Rauwolfia serpentina. The metabolic dynamics indicate that, within 48 hr, 4-methoxyphenol is almost completely converted into the primeveroside, methylursubin. Because of the higher sensitivity at 150.9 MHz compared to that at 100.6 MHz, measuring times could be reduced to 1.5 hr. This allows detailed monitoring of the conversion …
EORTC-1203-GITCG - the “INNOVATION”-trial: Effect of chemotherapy alone versus chemotherapy plus trastuzumab, versus chemotherapy plus trastuzumab pl…
2019
10–20% of patients with gastric cancer (GC) have HER2+ tumors. Addition of trastuzumab (T) to cisplatin/fluoropyrimidine-based chemotherapy (CT) improved survival in metastatic, HER2+ GC. When pertuzumab (P) was added to neoadjuvant T and CT, a significant increase in histopathological complete response rate was observed in HER2+ breast cancer. This study aims to investigate the added benefit of using both HER2 targeting drugs (T alone or the combination of T + P), in combination with perioperative CT for localized HER2+ GC. This is a prospective, randomized, open-label, phase II trial. HER2 status from patients with resectable GC (UICC TNM7 tumor stage Ib-III) will be centrally determined.…
Designing a packaging to promote healthy and low-fat foods: Adolescents versus young-adults
2017
Packaging is a relevant tool when adolescents and young adults search for low-fat and healthy foods. However, the power of a packaging is not homogenous. In this framework, two main objectives guide our work: (i) to investigate to what extent visual cues (size, colors, images etc.) are more important than informational cues (label); (ii) to analyze if adolescents and young adults pay equal attention to both packaging cues. 590 adolescents between 12 and 18years of age were interviewed at the door of both public and private schools. Additionally, 300 young adults between 19 and 25years of age were contacted. Their opinions were analyzed twice using structural modelling techniques: (i) withou…
Melanocortin receptor agonists MCR1-5protect photoreceptors from high-glucose damage and restore antioxidant enzymes in primary retinal cell culture
2016
Retinal photoreceptors are particularly vulnerable to local high-glucose concentrations. Oxidative stress is a risk factor for diabetic retinopathy development. Melanocortin receptors represent a family of G-protein-coupled receptors classified in five subtypes and are expressed in retina. Our previous data indicate that subtypes 1 and 5 receptor agonists exert a protective role on experimental diabetic retinopathy. This study focuses on their role in primary retinal cell cultures in high-glucose concentrations. After eye enucleation from wild-type male C57BL/6 mice, retinal cells were isolated, plated in high-glucose concentration and treated with melanocortin receptors 1 and 5 agonists an…
Daily energy expenditure through the human life course
2021
Total daily energy expenditure (“total expenditure”, MJ/d) reflects daily energy needs and is a critical variable in human health and physiology, yet it is unclear how daily expenditure changes over the life course. Here, we analyze a large, globally diverse database of total expenditure measured by the doubly labeled water method for males and females aged 8 days to 95 yr. We show that total expenditure is strongly related to fat free mass in a power-law manner and identify four distinct metabolic life stages. Fat free mass-adjusted daily expenditure accelerates rapidly in neonates (0-1yr) to ~46% above adult values at ~1 yr, declines slowly throughout childhood and adolescence (1-20 yr) t…
''Assessment of the use of hypolipidemic agents (HAs), mainly statins, in elderly subjects aged 80 years and more in Burgundy: Analysis of 13,211 pat…
2012
Manckoundia, Patrick | Lorenzini, Mathieu | Disson-Dautriche, Anne | Petit, Jean-Michel | Lorcerie, Bernard | Debost, Emmanuel | Menu, Didier | Pfitzenmeyer, Pierre; International audience; ''Only few studies have investigated the use of HA in elderly subjects and there are no data in very elderly subjects. We assessed the prescription of HA and analyzed the relationship between such prescriptions and frailty markers among persons aged 80 and more in an observational study. We recorded the prescriptions for 13,211 patients aged 80-109 years and affiliated to the "Mutualite-Sociale-Agricole (MSA)'' of Burgundy over a 1-month period. The prescription of a HA among all included patients, and t…