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One-dimensional photonic crystals with slowly varying, i.e. "chirped", lattice period are responsible for broadband light reflectance in many diverse biological contexts, ranging from the shiny coatings of various beetles to the eyes of…

Optics · Physics 2017-11-07 Caleb Q. Cook , Ariel Amir

For long it has been known that specific patterns of folding are necessary for an optimally functioning brain. For instance, lissencephaly and polymicrogyria can lead to severe mental retardation, short life expectancy, epileptic seizures,…

Biological Physics · Physics 2020-04-03 Lucas da Costa Campos , Raphael Hornung , Gerhard Gompper , Jens Elgeti , Svenja Caspers

One of the main trend in to date research and development is the miniaturization of electronic devices. In this perspective, integrated nanodevices based on proteins or biomolecules are attracting a major interest. In fact, it has been…

Quantitative Methods · Quantitative Biology 2015-06-26 E. Alfinito , C. Pennetta , L. Reggiani

We load cold atoms into an optical lattice dramatically reshaped by radiofrequency (rf) coupling of state-dependent lattice potentials. This rf dressing changes the unit cell of the lattice at a subwavelength scale, such that its curvature…

Quantum Physics · Physics 2009-11-13 N. Lundblad , P. J. Lee , I. B. Spielman , B. L. Brown , W. D. Phillips , J. V. Porto

Electrical and optical properties of binary inhomogeneous media are currently modelled by a random network of metallic bonds (conductance $\sigma_0$, concentration $p$) and dielectric bonds (conductance $\sigma_1$, concentration $1-p$). The…

Condensed Matter · Physics 2009-10-28 J. P. Clerc , G. Giraud , J. M. Luck , Th. Robin

Bone structure is generally hierarchically organized into organic (collagen, proteins,...), inorganic (hydroxyapatite (HAP)) components. However, many fundamental mechanisms of the biomineralization processes such as HAP formation, the…

Microtubule asters - radial arrays of microtubules organized by centrosomes - play a fundamental role in the spatial coordination of animal cells. The standard model of aster growth assumes a fixed number of microtubules originating from…

Subcellular Processes · Quantitative Biology 2018-07-02 Keisuke Ishihara , Kirill S. Korolev , Timothy J. Mitchison

Atrial Fibrillation (AF) is characterized by rapid, irregular heartbeats, and can lead to fatal complications such as heart failure. The disease is divided into two sub-types based on severity, which can be automatically classified through…

Computer Vision and Pattern Recognition · Computer Science 2023-08-15 Weihang Dai , Xiaomeng Li , Taihui Yu , Di Zhao , Jun Shen , Kwang-Ting Cheng

Tissue tracking in echocardiography is challenging due to the complex cardiac motion and the inherent nature of ultrasound acquisitions. Although optical flow methods are considered state-of-the-art (SOTA), they struggle with long-range…

Computer Vision and Pattern Recognition · Computer Science 2024-05-15 Md Abulkalam Azad , Artem Chernyshov , John Nyberg , Ingrid Tveten , Lasse Lovstakken , Håvard Dalen , Bjørnar Grenne , Andreas Østvik

Atherosclerotic plaques are fatty growths in artery walls that cause heart attacks and strokes. Plaque formation is orchestrated by macrophages that are recruited to the artery wall to consume and remove blood-derived lipids, such as…

Cell Behavior · Quantitative Biology 2022-05-12 M. G. Watson , K. L. Chambers , M. R. Myerscough

Microtubules, major elements of the cell skeleton are, most of the time, well organized in vivo, but they can also show self-organizing behaviors in time and/or space in purified solutions in vitro. Theoretical studies and models based on…

Biological Physics · Physics 2012-09-03 Nicolas Glade

The cochlea or inner ear has a remarkable ability to amplify sound signals. This is understood to derive at least in part from some active process that magnifies vibrations of the basilar membrane (BM) and the cochlear partition in which it…

Biological Physics · Physics 2015-07-08 William Ko , John M. Stockie

The semicircular canals of the inner ear are involved in balance and velocity control. Being crucial to ensure efficient mobility, their morphology exhibits an evolutionary conservatism attributed to stabilizing selection. Release of…

Populations and Evolution · Quantitative Biology 2024-10-18 Sabrina Renaud , Léa Amar , Pascale Chevret , Caroline Romestaing , Jean-Pierre Quéré , Corinne Régis , Renaud Lebrun

An active dissipative process organizes auditory frequency analysis in the mammalian cochlea. A minimal active beam model reveals that a spatially varying viscous coupling operator, $\partial_{xx}\kappa\partial_{xx}$, generates dissipative…

Biological Physics · Physics 2026-02-06 Yasuki Murakami

The spatial responses of many of the cells recorded in all layers of rodent medial entorhinal cortex (mEC) show a triangular grid pattern, and once established might be based in part on path-integration mechanisms. Grid axes are tightly…

Neurons and Cognition · Quantitative Biology 2012-03-20 Bailu Si , Emilio Kropff , Alessandro Treves

Conventional linear optical activity effects are widely used for studying chiral materials. However, poor contrast and artifacts due to sample anisotropy limit the applicability of these methods. Here we demonstrate that nonlinear…

Biological Physics · Physics 2016-02-16 Mei-Yu Chen , Mikko J. Huttunen , Che-Wei Kan , Yen-Yin Lin , Cin-Wei Ye , Meng-Jer Wu , Hsiang-Lin Liu , Shi-Wei Chu

This document reports an unconventional and rapidly developing approach to magnetic resonance imaging (MRI) using intermolecular multiple-quantum coherences (iMQCs). Rat brain images are acquired using iMQCs. We detect iMQCs between spins…

Medical Physics · Physics 2014-01-17 Yi Han

In the framework of assessing the pathology severity in chronic cough diseases, medical literature underlines the lack of tools for allowing the automatic, objective and reliable detection of cough events. This paper describes a system…

Audio and Speech Processing · Electrical Eng. & Systems 2020-05-13 Thomas Drugman , Jerome Urbain , Nathalie Bauwens , Ricardo Chessini , Anne-Sophie Aubriot , Patrick Lebecque , Thierry Dutoit

Current understanding of arrhythmia mechanisms and design of anti-arrhythmic drug therapies hinges on the assumption that myocytes from the same region of a single heart have similar, if not identical, action potential waveforms and drug…

Continuous multi-channel monitoring of biopotential signals is vital in understanding the body as a whole, facilitating accurate models and predictions in neural research. The current state of the art in wireless technologies for untethered…

Signal Processing · Electrical Eng. & Systems 2020-05-13 Shreeya Sriram , Shitij Avlani , Matthew P Ward , Shreyas Sen