A mid-infrared spectroscopic method was developed for the simultaneous and quantitative determination of total protein, carbohydrate and lipid contents of microalgal cells. Based on a chemometric approach, measured FTIR (Fourier transform infrared) spectra from algal cells were reconstructed by a partial least square algorithm, using the spectra of the reference substances to determine their relative contribution to the overall cell spectrum. From this specific absorption, absolute macromolecular cell composition [pg cell-1] can be calculated using calibration curves, which have been validated by independent biochemical methods. The future potential of this method for photosynthesis research is shown by its application to follow time-resolved changes in the cellular composition of microalgae during an illumination period of several hours. We show how the macromolecular composition can be investigated by FTIR spectroscopy methods. This can substantially increase the efficiency of screening processes like bioreactor monitoring and may be beneficial in metabolic engineering of algal cells.
CL20 (HNIW=hexanitrohexaazaisowurtzitane), is an energetic molecule that presents four polymorphs (called alpha (α-), beta (β-), gamma (γ-), and epsilon (ε-)). The ε form is the one used in propellant formulations (the rocket combustive agent). On the one hand, a method developed to measure ...
In the CO2-richer world that awaits us, the impact of elevated pCO2 on the allocation of resources in phytoplankton may have profound repercussions on the physiology of the microalgae and on the ecology of the ecosystems of which they are part. We studied the overall physiology and cell compositi...
The content and composition of the lignin phenols in plants and soils of vertical natural zones were studied in the Northern Caucasus region and Northwestern Tien Shan. Three types of lignin transformation were revealed: steppe, forest, and meadow ones. It was shown that the degree of oxidation o...
Increasing evidence suggests that the physicochemical properties of inhaled nanoparticles influence the resulting toxicokinetics and toxicodynamics. This report presents a method using scanning transmission electron microscopy (STEM) to measure the Mn content throughout the primary particle size ...
A novel method, called Direct Inversion in the Spectral Subspace (DISS), has been developed for the quantitative (and partly qualitative) analysis of chemical mixtures. The method belongs to the broad group of "supervised classification" methods: its use necessitates the components' "pure" spectr...
submitted by incltroflooxac 2 years and 4 months ago
Mixed stones form a significant number of all urinary stones. Accurate analysis of individual areas of stones is fraught with uncertainties. Scanning electron microscopy with elemental distribution analysis (SEM-EDAX) is a very important tool in assessing stone composition. The objective of this ...
In the present experimental study, a number of analytical techniques were used to identify the composition of gel and thus elucidate to a certain extent the mechanisms involved during synthesis of inorganic polymers. The raw materials used, low calcium slag from a ferronickel plant and commercial...
An imbalance in the cellular C:N ratio may appreciably affect C allocation in algal cells. The consequences of these rearrangements of cellular pools on cell energetics, ecological fitness, and evolutionary trajectories are little known, although they are expected to be substantial. We investigat...
In the present work, Synchrotron Radiation Fourier Transform Infrared (SRFTIR) micro-spectroscopy and imaging were used for topographic and semi-quantitative biochemical analysis of rat brain tissue in cases of pilocarpine-induced epilepsy. The tissue samples were analyzed with a beam defined by ...
Clinical demands for stronger and faster bone bonding to implants have motivated the development of chemically and topographically modified surfaces capable of chemical bonding. This study presents a new one-step alkali heat treatment performed with a solution containing [Zn(OH)4]2- complex as an...
