72 research outputs found
Manipulating Protein Conformations By Single-molecule Afm-fret Nanoscopy
Combining atomic force microscopy and fluorescence resonance energy transfer spectroscopy (AFM-FRET), we have developed a single-molecule AFM-FRET nanoscopy approach capable of effectively pinpointing and mechanically manipulating a targeted dye-labeled single protein in a large sampling area and simultaneously monitoring the conformational changes of the targeted protein by recording single-molecule FRET time trajectories. We have further demonstrated an application of using this nanoscopy on manipulation of single-molecule protein conformation and simultaneous single-molecule FRET measurement of a Cy3-Cy5-labeled kinase enzyme, HPPK (6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase). By analyzing time-resolved FRET trajectories and correlated AFM force pulling curves of the targeted single-molecule enzyme, we are able to observe the protein conformational changes of a specific coordination by AFM mechanic force pulling
Carrageenan-based hydrogels for the controlled delivery of PDGF-BB in bone tissue engineering applications
One of the major drawbacks found in most bone tissue engineering approaches developed so far consists in the
lack of strategies to promote vascularisation. Some studies have addressed different issues that may enhance
vascularisation in tissue engineered constructs, most of them involving the use of growth factors (GFs) that are
involved in the restitution of the vascularity in a damaged zone. The use of sustained delivery systems might also
play an important role in the re-establishment of angiogenesis. In this study, !-carrageenan, a naturally occurring
polymer, was used to develop hydrogel beads with the ability to incorporate GFs with the purpose of establishing
an effective angiogenesis mechanism. Some processing parameters were studied and their influence on the final
bead properties was evaluated. Platelet derived growth factor (PDGF-BB) was selected as the angiogenic factor
to incorporate in the developed beads, and the results demonstrate the achievement of an efficient encapsulation
and controlled release profile matching those usually required for the development of a fully functional vascular
network. In general, the obtained results demonstrate the potential of these systems for bone tissue engineering
applications.This work was supported by the European NoE EXPERTISSUES (NMP3-CT-2004-500283), the European STREP HIPPOCRATES (NMP3-CT-2003-505758), and by the Portuguese Foundation for Science and Technology (FCT) through the project PTDC/FIS/68517/2006 and through the V. Espirito Santo's Ph.D. grant (SFRH/BD/39486/2007)
A comparative study of the vibro-impact capsule systems with one-sided and two-sided constraints
Multi-objective optimization of a self-propelled capsule for small bowel endoscopy considering the influence of intestinal environment
This is the author accepted manuscript. The final version is available from Springer via the DOI in this recordData availability:
The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.This work studies the control optimization of a self-propelled capsule moving in the small intestinal environment for endoscopic diagnosis. For this purpose, we combine an existing capsule model with the intestinal peristalsis and its internal environment in order to gain a better understanding of dynamics of the self-propelled capsule. For the optimization study, a number of different realistic targets are considered, including the capsule’s average progression speed, the impact force acting on the small intestine and the capsule’s energy consumption. In addition, the uncertainty of the small intestine environment is taking into account by varying its internal radius. In this setting, we develop a multi-objective optimization strategy based on NSGA-II, Monte Carlo, and Six-Sigma algorithms considering both the control and structural model parameters, such as excitation frequency and impact stiffness. The effectiveness of the proposed optimization strategy is demonstrated via extensive numerical simulations with the consideration of a wide range of realistic scenarios
Automatic Selection of Structure Parameters of Silicon on Insulator Lateral Power Device Using Bayesian Optimization
Generation of atmospheric pressure diffuse dielectric barrier discharge based on multiple potentials in air
Interconnected State Control Method and Simulations of Four-corner Interconnected Air Suspension
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