Results 51 to 60 of about 13,001,808 (334)
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source
3D MHD simulation of polarized emission in SN 1006 [PDF]
, 2015 We use three dimensional magnetohydrodynamic (MHD) simulations to model the supernova remnant SN 1006. From our numerical results, we have carried out a polarization study, obtaining synthetic maps of the polarized intensity, the Stokes parameter $Q ...
De Colle, F. +4 more
core +2 more sources
Dynamic modeling of spatial parallel mechanism with multi-spherical joint clearances
International Journal of Advanced Robotic Systems, 2019 The parallel mechanism has advantages of the high speed, high precision, strong carrying capacity, and high structural rigidity. Most of the previous studies concerning the dynamic modeling focused on planar mechanisms with revolute clearance joints or ...
Xiulong Chen, Chenghao Sun
semanticscholar +1 more source
Control of Parallel Mechanisms.
Journal of the Robotics Society of Japan, 1992 There is a great deal of research on control of parallel mechanisms that considers their characteristics or how they may be made best use of. In this review, a dynamic control method by Uecker is introduced. As to force control, it explains effectiveness of parallel mechanisms and a hybrid control scheme by Nguyen.
openaire +2 more sources
Lubrication Mechanisms Between Parallel Rough Surfaces [PDF]
Tribology Letters, 2019 This paper presents a numerical analysis of the hydrodynamic pressure build-up between parallel surfaces. According to the Reynolds theory, it is not possible to generate a pressure between flat parallel sliding surfaces. However, experimental results demonstrate that mechanical seal surfaces can be separated by a full fluid film if the sliding speed ...
Brunetière, Noël, Francisco, Arthur
openaire +2 more sources
Mapping the evolution of mitochondrial complex I through structural variation
FEBS Letters, EarlyView.Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin +2 more
wiley +1 more source
Analysis and Optimization on Workspace of 2-PrRS-PR(P)S Parallel Metamorphic Mechanism
Jixie chuandong, 2020 Based on the theory of metamorphic mechanism，a novel parallel metamorphic mechanism of 2-PrRS-PR(P)S is proposed. The revolute pair of two limbs in the proposed mechanism can change its rotation axis to achieve the metamorphic configuration.
Ma Kun, Ma Hongwei, Tian Haibo
doaj
Workspace and Orientation Analysis of a Parallel Structure for Robotic Fingers
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2011 This paper investigates the workspace and the orientation capability of robotic fingers with a five-bar linkage and its variance defined by the parameter of a base link.
Wei YAO, Jian S DAI
doaj +1 more source
Kinematic analysis of the 3-RPR parallel manipulator [PDF]
, 2006 The aim of this paper is the kinematic study of a 3-RPR planar parallel manipulator where the three fixed revolute joints are actuated. The direct and inverse kinematic problem as well as the singular configuration is characterized.
Bonev, Ilian +2 more
core +2 more sources
FEBS Letters, EarlyView.Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi +5 more
wiley +1 more source