nuclear magnetic resonance nmr Articles
-
Cellulose bearing Schiff base and carboxylic acid chelating groups: a low cost and green adsorbent for heavy metal ion removal from aqueous solution
Chemically modified cellulose bearing metal binding sites like Schiff base and carboxylic acid groups was synthesized and characterized through Fourier transform infrared and solid state 13C–nuclear magnetic resonance (NMR) analysis. The chemically modified cellulose (Cell-PA) adsorbent was examined for its metal ion uptake ability for Cu(II) and Pb(II) ions from aqueous solution. Kinetic and ...
-
FastTIMES article: Surface and Borehole NMR as a Characterization Tool for Managed Aquifer Recharge
Nuclear Magnetic Resonance (NMR) is a powerful technology for groundwater investigations, leveraging the same physics as medical MRI imaging to directly detect water and characterize subsurface hydrogeologic parameters. In geophysics, surface NMR methods can be used to non-invasively map groundwater aquifers and borehole logging NMR tools can be used to obtain high-resolution estimates of ...
-
Using Helios to test NMR response of iron ore chip samples
The application of Nuclear Magnetic Resonance (NMR) to investigate the distribution of moisture in materials has not normally been applied to iron ores due to the magnetic properties of iron. However recent test work on blast hole chip samples of iron ore using the very low field Helios system has shown that it is possible to obtain useful information on moisture content. The key to obtaining ...
-
The effect of magnetic susceptibility and magnetic field strength on porosity estimates determined from low-field nuclear magnetic resonance
The presence of materials with high magnetic susceptibility are known to have an impact on nuclear magnetic resonance (NMR) measurements and in laboratory data this often results in poor estimates of porosity from NMR data. To quantify and understand the cause of the poor NMR porosity estimations, in this laboratory study, we examine the effect of magnetic susceptibility, NMR measurement ...
-
Biosynthesis of biodegradable polyhydroxyalkanotes biopolymers in genetically modified yeasts
Abstract: In the recent decade, biosynthesis of the degradable biopolymers polyhydroxyalkanotes in transgenic yeasts became an important research task. Most research strategies depend on either metabolic engineering or molecular approaches. In the present work, research compared PHA biosynthesis in two types of yeasts; Saccharomyces cerevisiae and a non-convenient Kloeckera spp. Yeast strains ...
-
A biofilm microreactor system for simultaneous electrochemical and nuclear magnetic resonance techniques
Nuclear magnetic resonance (NMR) techniques are ideally suited for the study of biofilms and for probing their microenvironments because these techniques allow for noninvasive interrogation and in situ monitoring with high resolution. By combining NMR with simultaneous electrochemical techniques, it is possible to sustain and study live biofilms respiring on electrodes. Here, we describe a ...
-
Rapid estimation of nuclear magnetic resonance experiment time in low‐concentration environmental samples
Nuclear magnetic resonance (NMR) spectroscopy is an essential tool for studying environmental samples but is often hindered by low sensitivity, especially for the direct detection of nuclei such as 13C. In very heterogeneous samples with NMR nuclei at low abundance, such as soils, sediments, and air particulates, it can take days to acquire a conventional 13C spectrum. The present study ...
-
Aqueous and lipid NMR metabolomic profiles of the earthworm Aporrectodea caliginosa show potential as an indicator species for environmental metabolomics
The common pasture earthworm Aporrectodea caliginosa has often been neglected in environmental metabolomics in favour of easily laboratory‐bred species. The present study assigns aqueous metabolites in A. caliginosa using high resolution 1‐ and 2‐dimensional nuclear magnetic resonance (NMR) spectroscopy. In total 51 aqueous metabolites were identified, including typical amino acids (alanine, ...
-
High resolution accurate mass spectrometry as a technique for characterization of complex lysimeter leachate samples
Lysimeter studies can be used to identify and quantify soil degradates of agrochemicals (“metabolites”) which have the potential to leach to groundwater. However, the apparent metabolic profile of such lysimeter leachate samples will often be significantly more complex than would be expected in true groundwater samples. This is particularly true for S‐metolachlor, which has an extremely ...
-
Phosphorus-31 nuclear magnetic resonance spectroscopy transect study of poultry operations on the Delmarva peninsula
Nonpoint source phosphorus (P) pollution into the Chesapeake Bay watershed from poultry operations contributes to the algal blooms, hypoxia, anoxia, and fish kill events that occur there most years. A major source of soluble, bioavailable P species is poultry litter, which is used as a crop fertilizer on fields adjacent to the tributaries of the Bay. A potentially significant source of ...
-
Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska
Abstract Lakes and drained lake basins (DLBs) together cover up to ∼80% of the western Arctic Coastal Plain of Alaska. The formation and drainage of lakes in this continuous permafrost region drive spatial and temporal landscape dynamics. Postdrainage processes including vegetation succession and permafrost aggradation have implications for hydrology, carbon cycling, and landscape evolution. ...
-
Soil organic matter quality under different land uses in a mountain watershed of Nepal
Land use change is one of the anthropogenic interventions that may induce substantial modifications to both the quantity and quality of soil organic matter (SOM). Soils from three cultivated areas (two types of rainfed upland and one irrigated lowland) and two forests (subtropical managed and temperate unmanaged) in a midhill watershed of Nepal were studied to assess the effect of land use change ...
-
Advantages of NMR vs ERT for Characterizing Aquifers in Highly Saline Environments
One of the more challenging situations in geophysics is the need to identify and characterize aquifers in highly saline environments. Saline environments are inherently conductive, which means conventional Electrical Resistivity Tomography (ERT) techniques are less effective because the ERT signals don’t penetrate very far into highly conductive ground and the contrasts between water and ...
-
Decolourization performance in C. I. Vat Yellow 1 aqueous suspension using hydrophobically modified poly(acrylic acid)
A series of hydrophobically modified poly(acrylic acid) (PAA), poly(2-phenoxyethyl acrylate-co-acrylic acid) (poly(PHEA-co-AA)), have been synthesized and characterized by Ubbelohde type viscometry, Nuclear Magnetic Resonance (1H NMR) spectrometry and Differential Scanning Calorimetry (DSC). The shear thinning Non-Newtonian fluid behavior of their aqueous solution and the dependence on pH and ...
-
NMR Can Measure Groundwater Directly – Even in Permafrost Environments
In permafrost landscapes, the ground remains mostly frozen throughout the year and liquid groundwater only occurs in certain locations or during anomalously warm periods. Understanding the spatial and temporal distribution of groundwater in these environments is extremely important as it can affect processes ranging from geotechnical soil stability to the release of greenhouse gases. In a ...
-
The Centre for Hyperpolarisation in Magnetic Resonance - Case Study
Name: Victoria Annis Job Title: Research Technician Company: The Centre for Hyperpolarisation in Magnetic Resonance, The University of York, York, England, United Kingdom The Centre for Hyperpolarisation in Magnetic Resonance at the University of York Peak hydrogen generators assist researchers at The University of York The Centre for Hyperpolarisation in Magnetic Resonance (CHyM) is a ...
-
Polymer Characterization: A Practical Guide
What is polymer characterization? The study of the physical, chemical, and mechanical properties of polymers is known as polymer characterization. It is a broad field that includes a variety of techniques. The goal of polymer characterization is to comprehend polymer structure-property relationships. This knowledge can be applied to create new polymers with desired properties, improve the ...
By Matexcel
-
Insights into Colloidal Nanomaterials: Classification, Structure, Synthesis and Characterization
Colloidal nanomaterials represent a rapidly evolving and interdisciplinary field with a wide range of applications. The combination of diverse synthetic methods, cutting-edge characterization techniques, and a fundamental understanding of the structural properties of these materials is crucial for advancing the field and realizing the full potential of colloidal nanomaterials. Classification of ...
-
High throughput HPLC/MS purification in support of drug discovery
Abstract High throughput purification techniques are an important part of drug discovery and provide high-quality compounds for biological screening. In this paper, we describe the purification platform developed by ArQule that is based on reverse phase high performance liquid chromatography (RP-HPLC) separation and mass directed fractionation. By strictly enforcing collection of only one ...
-
Polymer Characterization -- BOC Sciences
Polymer testing and characterization is a key to solving the relationship between material composition, structure, and performance. Through a series of characterization techniques, the size, morphology, structure, chemical composition, thermal properties, mechanical properties, etc. of polymers can be studied qualitatively and quantitatively. This is a complex and multi-faceted process that ...
By BOC Sciences
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you