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5 results for “absorbance spectra”
Time series of in situ Uv-Vis absorbance spectra and high-frequency predictions of total and soluble Fe and Mn concentrations measured at multiple depths in Falling Creek Reservoir (Vinton, VA, USA) in 2020 and 2021
High-frequency measurements of light absorbance were collected at multiple depths in Falling Creek Reservoir (FCR; Vinton, VA, USA) using a s::can Spectrolyser UV-Visible spectrophotometer coupled with a multiplexor pumping system. The system pumps water samples from individual depths into a flow-through cuvette where the UV-vis absorbance spectra of the sample are measured by the spectrophotometer. The system used in our study collected measurements of light absorbance every 2.5 nm wavelengths from 200 nm to 732.5 nm (optical path length of 10 mm) approximately at an hourly time step for seven monitoring depths in the reservoir. Data was collected during two periods; the first deployment (16 October to 9 November 2020) was to observe changes in Fe and Mn concentrations before, during, and after reservoir fall turnover and the second deployment (26 May to 21 June 2021) was to observe the effects of engineered hypolimnetic oxygenation on Fe and Mn concentrations. Partial least squares regression models were developed to generate predictions of total and soluble Fe and Mn concentrations based on the correlation between absorbance spectra and sampling data.
UV-Vis absorbance data, molar extinction coefficients and circular dichroism spectra for the two cyanobacterial metabolites anabaenopeptin A and anabaenopeptin B
<p>Data for:</p> <p>"<span>The UV-Vis absorbance spectra, molar extinction coefficients and circular dichroism spectra as well as NMR and mass spectrometry spectra were determined for two prominent secondary metabolites from cyanobacteria, namely anabaenopeptin A and anabaenopeptin B. The compounds were extracted from the cyanobacterium </span><em><span>Planktothrix rubescens</span></em><span> CBT929 and purified by flash chromatography and HPLC. Exact amounts of isolated compounds were assessed by quantitative <sup>1</sup>H-NMR with internal calibrant ethyl 4-(dimethylamino)benzoate in DMSO-<em>d<sub>6</sub></em> at 298 K with a recycle delay (d1) of 120 s. UV-Vis absorbance spectra were recorded in methanol at room temperature. Molar extinction coefficients were determined at 278 nm as 4190 M<sup>-1</sup> cm<sup>-1</sup> and 2300 M<sup>-1</sup> cm<sup>-1</sup> in methanol for anabaenopeptin A and anabaenopeptin B, respectively. Circular dichroism spectra and secondary fragmentation mass spectra are also reported."</span></p>
OLIVINE LABORATORY INFRARED ABSORBANCE SPECTRA V1.0
Laboratory measurements quantifying the effect of Fe substituting for Mg in olivine are necessary to distinguish compositional from temperature, grain size and grain shape effects in observational data. This dataset presents room temperature (18-19 degrees Celsius) diamond anvil cell thin film absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions at infrared wavelengths. In each file, the left column is the frequency in wave numbers (units: cm**-1). The right column is the chemical absorbance (common logarithm based).
OLIVINE LABORATORY INFRARED ABSORBANCE SPECTRA
Laboratory measurements quantifying the effect of Fe substituting for Mg in olivine are necessary to distinguish compositional from temperature, grain size and grain shape effects in observational data. This bundle presents room temperature (18-19 degrees Celsius) diamond anvil cell thin film absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions at infrared wavelengths. In each file, the left column is the frequency in wave numbers (units: cm**-1). The right column is the chemical absorbance (common logarithm based).
OLIVINE LABORATORY INFRARED ABSORBANCE SPECTRA V1.0
Laboratory measurements quantifying the effect of Fe substituting for Mg in olivine are necessary to distinguish compositional from temperature, grain size and grain shape effects in observational data. This dataset presents room temperature (18-19 degrees Celsius) diamond anvil cell thin film absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions at infrared wavelengths. In each file, the left column is the frequency in wave numbers (units: cm**-1). The right column is the chemical absorbance (common logarithm based).
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