Results 31 to 40 of about 4,109,239 (244)
Structural and biochemical analysis of a B12 superbinder
FEBS Letters, EarlyView.BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices +3 more
wiley +1 more source
Enhanced YOLOv8-based method for space debris detection using cross-scale feature fusion
Discover Applied SciencesOptical observations play a crucial role in monitoring space debris, and long exposure large field-of-view telescopes exhibit robust detection capabilities for identifying space debris.
Yang Guo +5 more
doaj +1 more source
Research on Actuator Control System Based on Improved MPC
ActuatorsTo improve the control accuracy and interference resistance of actuator control systems in complex environments, a complete actuator control system solution has been designed.
Qingjian Zhao +7 more
doaj +1 more source
Reference Scenario and Target Identification for Autonomous Active Space Debris Removal Methods [PDF]
, 2013 To alleviate the threat of space debris, a combination of debris mitigation measures and debris environment re- mediation techniques with regard to long-term environ- ment stability is required.
Förstner, Roger +3 more
core
FEBS Letters, EarlyView.Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav +2 more
wiley +1 more source
AerospaceAccurate prediction of the on-orbit positions of Low Earth Orbit (LEO) satellites is essential for mission success, operational efficiency, and safety.
Yang Guo, Boyang Wang, Zhengxu Zhao
doaj +1 more source
Evolution of space debris for spacecraft in the Sun-synchronous orbit
Open Astronomy, 2020 In this paper, the evolution of space debris for spacecraft in the Sun-Synchronous orbit has been investigated. The impact motion, the evolution of debris from the Sun-Synchronous orbit, as well as the evolution of debris clouds from the quasi-Sun ...
Jiang Yu, Li Hengnian, Yang Yue
doaj +1 more source
Design and Analysis of Preload Control for Space Debris Impact Adhesion Capture Method
IEEE Access, 2020 The growing space debris poses a serious threat to the safety of the space environment, and the necessity and urgency of active space debris removal have reached a consensus around the world.
Zhengyou Xie +3 more
doaj +1 more source
Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment
Molecular Oncology, EarlyView.This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley +1 more source
Bayesian Adaptive Extended Kalman-Based Orbit Determination for Optical Observation Satellites
SensorsAs the number of satellites and amount of space debris in Low-Earth orbit (LEO) increase, high-precision orbit determination is crucial for ensuring the safe operation of spacecraft and maintaining space situational awareness.
Yang Guo +6 more
doaj +1 more source