Results 51 to 60 of about 307,069 (348)

Epigenetic blind spots – the role of DNA methylation dynamics in stem cell‐based models of embryogenesis

FEBS Letters, EarlyView.
Embryo‐like structures (stembryos) are an innovative tool, but they are hindered by experimental variability and limited developmental potential. DNA methylation is crucial for mammalian development, but its status in stembryo models is poorly characterized.
Sara Canil, Anna Corrà, Annalisa Scapolatiello, Chengxiang Qiu, Gianluca Amadei   +4 more
wiley   +1 more source

Design and Analysis of Harmonic Reducer Combined Curve Cam Wave Generators

Jixie chuandong, 2023
The shape of wave generator directly affects the mechanical characteristics of the flexspline. Flexspline is the weakest part of harmonic drivers. In order to improve its life, the design of a cam wave generator based on a conical curve combination is ...
Mu Man, Tao Menglun, Liu Bin, Chen Dingfang, Wu Junfeng, Zhang Huiming, Hu Qunfei   +6 more
doaj  

Circuit operates as sine function generator [PDF]

, 1966
Electronic circuit drives sine function generator using square wave and sawtooth sweep generators.
Bogart, T., Jr.
core   +1 more source

Evolution of time-harmonic electromagnetic and acoustic waves along waveguides [PDF]

, 2017
We study time-harmonic electromagnetic and acoustic waveguides, modeled by an infinite cylinder with a non-smooth cross section. We introduce an infinitesimal generator for the wave evolution along the cylinder, and prove estimates of the functional ...
Nursultanov, Medet, Rosén, Andreas
core   +2 more sources

Hijacking emergency granulopoiesis: Neutrophil ontogeny and reprogramming in cancer

Molecular Oncology, EarlyView.
Neutrophils are highly plastic innate immune cells; their functions in cancer extend beyond the tumour microenvironment. This Review summarises current understanding of neutrophil maturation and heterogeneity and highlights tumour‐induced granulopoiesis as a systemic programme that expands immature, immunosuppressive neutrophils via tumour‐derived ...
Gabriela Marinescu, Yi Feng
wiley   +1 more source

Ultrasonic bone densitometer [PDF]

, 1974
A device, for measuring the density of a bone structure so as to monitor the calcium content, is described. A pair of opposed spaced ultrasonic transducers are held within a clamping apparatus closely adjacent the bone being analyzed.
Hoop, J. M.
core   +1 more source

Nonlinear propagation of Alfven waves driven by observed photospheric motions: Application to the coronal heating and spicule formation

, 2010
We have performed MHD simulations of Alfven wave propagation along an open flux tube in the solar atmosphere. In our numerical model, Alfven waves are generated by the photospheric granular motion.
Antolin, Berger, Carlsson, Carlsson, De Pontieu, Edlén, Gudiksen, Hansteen, Harvey, Hasan, Hasan, Heyvaerts, Hori, Isobe, Kazunari Shibata, Kudoh, Leenaarts, Leroy, Moriyasu, Moriyasu, Muller, Nagata, Rouppe van der Voort, Saito, Shibata, Shibata, Stein, Steiner, Stix, Suzuki, Takeuchi, Takeuchi, Takuma Matsumoto, Tarbell   +33 more
core   +1 more source

dUTPase is essential in zebrafish development and possesses several single‐nucleotide variants with pronounced structural and functional consequences

FEBS Open Bio, EarlyView.
dUTPases are involved in balancing the appropriate nucleotide pools. We showed that dUTPase is essential for normal development in zebrafish. The different zebrafish genomes contain several single‐nucleotide variations (SNPs) of the dut gene. One of the dUTPase variants displayed drastically lower protein stability and catalytic efficiency as compared ...
Viktória Perey‐Simon, Angéla Békesi, Latifa Kazzazy, Jázmin Mihály, Máté Varga, Beáta G. Vértessy, Kinga Nyíri   +6 more
wiley   +1 more source

Research on Optimization of Pressure Wave Waveform of Continuous Wave Drilling Fluid Pulse Generator

Shiyou jixie, 2020
To solve the problem of poor half periodicity of pressure wave shape of continuous wave drilling fluid pulse generator, the pressure difference calculation model and numerical simulation calculation model are established, and the pressure waveform of ...
Liu Xianbo, Xue Liang, Liu Min, Wang Zhiming, Zhang Zheng, Shao Tianyu   +5 more
doaj  

Linear sawtooth voltage-wave generator employing transistor timing circuit having capacitor-zener diode combination feedback Patent [PDF]

, 1967
Linear sawtooth voltage wave generator with transistor timing circuit having capacitor and zener diode feedback ...
Green, E. D., Woolfson, M. G.
core   +1 more source