Results 31 to 40 of about 764,086 (315)

2RPS/2SPS Parallel Mechanism and Kinematics Analysis

Jixie chuandong, 2020
Based on constraint spiral theory，the modified Grübler-Kutzbach formula is used to analyze the degree of freedom of 2RPS/2SPS parallel mechanism. The inverse positional solution equation is established by the space coordinate transformation equation and ...
Zhou Yijun, Chen Yefu, Su Ronghai
doaj  

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

Modeling and Verification of Kinematics Error of 3UPS-PU Parallel Mechanism

Jixie chuandong, 2020
Taking the 3UPS-PU parallel mechanism，the experiment platform of sample package special test in the lunar exploration project as the study object，the error analysis model of 3UPS-PU parallel mechanism is established by using matrix differential method ...
Wang Na, Zhang Tao, Wang Qiuhong
doaj  

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, Tingting Chen, James A. Letts   +2 more
wiley   +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

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

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, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 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

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source