Results 41 to 50 of about 254,167 (296)

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

The Coupled Wing Morphing of Ornithopters Improves Attitude Control and Agile Flight

Machines
Bird wings are exquisite mechanisms integrated with multiple morphological deformation joints. The larger avian species are particularly adept at utilizing their wings’ flapping, folding, and twisting motions to control the wing angle and area.
Yu Cai, Guangfa Su, Jiannan Zhao, Shuang Feng   +3 more
doaj   +1 more source

Evolution of twist-shear and dip-shear during X-class flare of 13 December 2006: Hinode observations

, 2010
The non-potentiality (NP) of the solar magnetic fields is measured traditionally in terms of magnetic shear angle i.e., the angle between observed and potential field azimuth.
Gosain, Sanjay, Venkatakrishnan, P.
core   +1 more source

Genetic attenuation of ALDH1A1 increases metastatic potential and aggressiveness in colorectal cancer

Molecular Oncology, EarlyView.
Aldehyde dehydrogenase 1A1 (ALDH1A1) is a cancer stem cell marker in several malignancies. We established a novel epithelial cell line from rectal adenocarcinoma with unique overexpression of this enzyme. Genetic attenuation of ALDH1A1 led to increased invasive capacity and metastatic potential, the inhibition of proliferation activity, and ultimately ...
Martina Poturnajova, Zuzana Kozovska, Ondrej Pos, Kristina Pavlov, Sachin Gulati, Peter Makovicky, Kristina Jakic, Monika Burikova, Eva Sedlackova, Barbora Svitkova, Silvia Tyciakova, Vojtech Bystry, Nicolas Blavet, Boris Tichy, Matej Hrnciar, Jaroslav Budis, Miroslav Tomas, Peter Dubovan, Georgina Kolnikova, Veronika Repaska, Nikoleta Mojzesova, Eva Zomborska, Daniel Pindak, Michal Mego, Tomas Szemes, Miroslava Matuskova   +25 more
wiley   +1 more source

Constraining 3D Magnetic Field Extrapolations Using The Twin Perspectives of STEREO [PDF]

, 2010
The 3D magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of \emph{STEREO}.
Alissandrakis, Aschwanden, Aschwanden, Aschwanden, Brosius, Burnette, DeRosa, Lim, Long, Longcope, Longcope, Metcalf, Paul A. Conlon, Peter T. Gallagher, Phillips, Régnier, Schrijver, Vlahos   +17 more
core   +1 more source

ACTIVE-TWIST ROTOR CONTROL APPLICATIONS FOR UAVs [PDF]

Transformational Science and Technology for the Current and Future Force, 2006
The current state-of-the-art in active-twist rotor control is discussed using representative examples from analytical and experimental studies, and the application to rotary-wing UAVs is considered. Topics include vibration and noise reduction, rotor performance improvement, active blade tracking, stability augmentation, and rotor blade de-icing.
Matthew L. Wilbur, W. Keats Wilkie
openaire   +1 more source

Homologous expression and purification of human HAX‐1 for structural studies

FEBS Open Bio, EarlyView.
This research protocol provides detailed instructions for cloning, expressing, and purifying large quantities of the intrinsically disordered human HAX‐1 protein, N‐terminally fused to a cleavable superfolder GFP, from mammalian cells. HAX‐1 is predicted to undergo posttranslational modifications and to interact with membranes, various cellular ...
Mariana Grieben
wiley   +1 more source

New dynamo pattern revealed by solar helical magnetic fields [PDF]

, 2009
Previously unobservable mirror asymmetry of the solar magnetic field -- a key ingredient of the dynamo mechanism which is believed to drive the 11-year activity cycle -- has now been measured.
A. Pevtsov, Abramenko, Abramenko, Bao, Bao, Brandenburg, Choudhuri, D. D. Sokoloff, Gao, Hagino, Hagino, Haiqing Xu, Hale, Hongqi Zhang, K. Kuzanyan, Kleeorin, Kuzanyan, Otmianowska-Mazur, Parker, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Seehafer, Seehafer, Sokoloff, Sokoloff, Sokoloff, Su, T. Sakurai, Tanaka, Xu, Yeates, Yu Gao, Zhang, Zhang, Zhang, Zhang   +38 more
core   +1 more source

Active twisting for adaptive droplet collection

Nature Computational Science
Abstract Many xeric plant leaves exhibit bending and twisting morphology, which may contribute to their important biological and physical functions adapted to drought and desert conditions. Revealing the relationships between various morphologies and functionalities can inspire device designs for meeting increasingly stringent environmental ...
Yang, Yifan, Dai, Zhijun, Chen, Yuzhen, Xu, Fan   +3 more
openaire   +2 more sources

Strong optical activity from twisted-cross photonic metamaterials

Optics Letters, 2009
Following a recent theoretical suggestion and microwave experiments, we fabricate photonic metamaterials composed of pairs of twisted gold crosses using two successive electron-beam-lithography steps and intermediate planarization via a spin-on dielectric.
Decker, M., Ruther, M., Kriegler, C. E., Zhou, J., Soukoulis, C. M., Linden, Stefan, Wegener, M.   +6 more
openaire   +3 more sources