Inelastic light scattering studies of biological \nmacromolecular solutions and virus crystals
Why this work is in the frame
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Bibliographic record
Abstract
In this study, Brillouin light scattering is used as a tool to explore the elastic and \nviscoelastic properties of different macromolecular systems. Specifically, we explore \ntwo common macromolecular systems: aqueous solutions and crystals. By performing \nexperiments on these different systems, we are able to explore the evolution of the \nproperties of interest in three distinct regimes. By performing experiments on aqueous \nsolutions, we are able to explore the dilute regime, wherein solute molecules may be \ntreated as non-interacting particles, and the semi-dilute regime, where intermolecular \ninteractions cannot be neglected. Finally, performing experiments on macromolecular \ncrystals allows us to observe the elastic properties of macromolecules in the solid state. \nThe effects of macromolecular crowding have been extensively studied by various \nexperimental techniques. Such works have demonstrated a significant amount of \nbinding of solvent to the hydration shells of such crowders, drastically reducing the \navailable free volume. In this work, Brillouin light scattering experiments were performed \non aqueous solutions of Ficoll 70 and Ficoll 400 with concentrations ranging \nfrom 1 wt% to 35 wt% and Bovine Serum Albumin with concentrations of 1 wt% \nto 27 wt%. By examining the evolution of longitudinal Brillouin peak parameters \nwith solute concentration, we calculated viscoelastic properties, including hypersound \nvelocity, adiabatic bulk modulus and compressibility, apparent viscosity, and hypersound \nattenuation. Existing theory could only capture trends in this evolution up \nto a threshold concentration due to the neglect of intermolecular interactions. As \nsuch, the addition of a quadratic term was incorporated to account for intermolecular \ninteractions between solute molecules. In Ficoll solutions, evidence of a central mode, \nwhich is due to relaxation of solvent in the polymer hydration shell, was observed. \nIn recent years, there has been a growing amount of interest in exploration of the \nelastic properties of crystalline macromolecular structures. Such properties of virus \ncrystals, however, are still hardly known. In the present work, crystals of satellite \ntobacco mosaic virus were grown using hang drop vapour diffusion techniques. Crystal \nclusters grown were subsequently used in Brillouin light scattering experiments. \nPeaks in Brillouin spectra were determined to be due to longitudinal bulk modes, \nand the parameters of these peaks were used to approximate hypersound velocity and \nattenuation within the crystals.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it