scholarly journals Experimental Review of Hadron Spectroscopy

2018 ◽  
Vol 46 ◽  
pp. 1860005
Author(s):  
Chengping Shen ◽  
Suxian Li
Keyword(s):  
Quark Model ◽  
Complex Structures ◽  
Hadron Spectroscopy ◽  
The Past ◽  
H Dibaryon ◽  
Exotic Hadrons ◽  
Remarkable Progress

Since the invention of the quark model in 1964 hadrons are formed from a quark-antiquark pair called mesons or three quarks called baryons. However, QCD-motivated models for hadrons predict more complex structures on the hadrons components called generically exotics. These include tetraquark, pentaquark, the six-quark H-dibaryon, hybrid, and glueball mesons. Exotic hadrons have been systematically searched for in many experiments and studied in theories. In the past decade, lots of new hadrons that cannot fit into the normal mesons or baryons were discovered, the so-called [Formula: see text] states. Even so, no unambiguous candidates for any of those exotic configurations have been identified. This review presents an overview of the remarkable progress in the field of exotic hadrons over the past few years.

scholarly journals SIGNATURES OF EXOTIC HADRONS

2011 ◽  
Vol 26 (29) ◽  
pp. 4855-4879
Author(s):  
FRANCESCO RENGA
Keyword(s):  
Quantum Chromodynamics ◽  
Hadron Collider ◽  
Fundamental Symmetries ◽  
Hadron Spectroscopy ◽  
The Past ◽  
Standard Picture ◽  
Strong Forces ◽  
Exotic Hadrons

Hadron spectroscopy represented in the past a major tool for understanding the fundamental symmetries of strong forces. More recently, the interest on this topic has been revitalized by the discovery of new quarkonium-like resonances, that do not fit in the standard picture and whose understanding could improve our mastery of quantum chromodynamics. I review here the experimental signatures of these exotic hadrons, at present and future e+e- and hadron collider experiments.

scholarly journals Four-quark matter—a new era of spectroscopy

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Zhiqing Liu
Keyword(s):  
Quark Matter ◽  
Particle Physics ◽  
Hadronic Matter ◽  
Intensive Study ◽  
New Era ◽  
Hadron Spectroscopy ◽  
The Past ◽  
Past Half Century ◽  
Exotic Hadrons ◽  
Past Half

AbstractIn 1964, both Gell-Mann and Zweig proposed the famous Quark Model in particle physics, which tells us hadrons are built of three quarks (baryons) or quark anti-quark pair (mesons). However, the theory of strong interaction—QCD—allows the existing of hadrons beyond the conventional baryon and meson picture. These new hadron states are called exotic hadrons, and have been searched for over the past half century. In this review, I will introduce you the discovery of a new particle called Zc(3900), which is considered as the first convincing four-quark particle. The observation of four-quark matter gains great interest in particle physics, and triggered subsequent intensive study of exotic hadrons, which brings us to a new era of hadron spectroscopy and refreshes our knowledge about the hadronic matter in our universe.

scholarly journals Inflammation, epigenetics, and metabolism converge to cell senescence and ageing: the regulation and intervention

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Xudong Zhu ◽  
Zhiyang Chen ◽  
Weiyan Shen ◽  
Gang Huang ◽  
John M. Sedivy ◽  
...  
Keyword(s):  
Cell Fate ◽  
Cellular Response ◽  
State Of The Art ◽  
Cell Senescence ◽  
Therapeutic Interventions ◽  
Cell Fate Decision ◽  
The Past ◽  
Fate Decision ◽  
The Individual ◽  
Remarkable Progress

AbstractRemarkable progress in ageing research has been achieved over the past decades. General perceptions and experimental evidence pinpoint that the decline of physical function often initiates by cell senescence and organ ageing. Epigenetic dynamics and immunometabolic reprogramming link to the alterations of cellular response to intrinsic and extrinsic stimuli, representing current hotspots as they not only (re-)shape the individual cell identity, but also involve in cell fate decision. This review focuses on the present findings and emerging concepts in epigenetic, inflammatory, and metabolic regulations and the consequences of the ageing process. Potential therapeutic interventions targeting cell senescence and regulatory mechanisms, using state-of-the-art techniques are also discussed.

scholarly journals Will China Become a Global Technological Giant?

2018 ◽  
Vol 48 (3) ◽  
pp. 77-82
Author(s):  
Marcin Piatkowski
Keyword(s):  
Public Support ◽  
Managerial Practices ◽  
The Past ◽  
Support For Innovation ◽  
The Us ◽  
Lectual Property ◽  
Technology Absorption ◽  
China Today ◽  
Remarkable Progress

The article argues that China has achieved a remarkable progress in promoting technology absorption and innovation over the past decade. China today spends 2.1 percent of GDP on R&D, more than the OECD average. By 2020, China together with the US will be responsible for more than half of the world’s R&D spending. These two countries may thus largely de-cide about the speed and direction of mankind’s technological progress. Despite the pro-gress, however, China still faces several challenges to becoming a global technological giant. To face these challenges, China would be well advised to increase the quality of innovation outputs, strengthen efficiency of public support for innovation, further strengthen intel-lectual property rights, and help enhance managerial practices of Chinese firms.

New challenges in viral hepatitis

Gut ◽  
2012 ◽  
Vol 61 (Suppl 1) ◽  
pp. i1-i5 ◽  
Author(s):  
David Thomas ◽  
Fabien Zoulim
Keyword(s):  
Viral Hepatitis ◽  
Hepatitis Virus ◽  
Virus Infections ◽  
The Past ◽  
Treatment And Prevention ◽  
Introductory Article ◽  
Key Issues ◽  
New Challenges ◽  
Reliable Methods ◽  
Remarkable Progress

Over the past few decades there has been remarkable progress in viral hepatitis. Beginning with discovery of the viral agents, we now have reliable methods to diagnose and monitor all hepatitis virus infections, as well significant advances in treatment and prevention. Nonetheless, important challenges remain. This supplement to Gut looks forward to the next generation of challenges in the field of viral hepatitis, and this introductory article highlights several key issues.

scholarly journals An uracil-linked hydroxyflavone probe for the recognition of ATP

2018 ◽  
Vol 14 ◽  
pp. 747-755 ◽  
Author(s):  
Márton Bojtár ◽  
Péter Zoltán Janzsó-Berend ◽  
Dávid Mester ◽  
Dóra Hessz ◽  
Mihály Kállay ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Electrostatic Interactions ◽  
Theoretical Calculations ◽  
Structural Similarity ◽  
Living Systems ◽  
Selective Detection ◽  
Complex Structures ◽  
Fluorescent Chemosensors ◽  
The Past ◽  
Physiological Processes

Background: Nucleotides are essential molecules in living systems due to their paramount importance in various physiological processes. In the past years, numerous attempts were made to selectively recognize and detect these analytes, especially ATP using small-molecule fluorescent chemosensors. Despite the various solutions, the selective detection of ATP is still challenging due to the structural similarity of various nucleotides. In this paper, we report the conjugation of a uracil nucleobase to the known 4’-dimethylamino-hydroxyflavone fluorophore. Results: The complexation of this scaffold with ATP is already known. The complex is held together by stacking and electrostatic interactions. To achieve multi-point recognition, we designed the uracil-appended version of this probe to include complementary base-pairing interactions. The theoretical calculations revealed the availability of multiple complex structures. The synthesis was performed using click chemistry and the nucleotide recognition properties of the probe were evaluated using fluorescence spectroscopy. Conclusions: The first, uracil-containing fluorescent ATP probe based on a hydroxyflavone fluorophore was synthesized and evaluated. A selective complexation with ATP was observed and a ratiometric response in the excitation spectrum.

Stress Distribution in Joints in Panel Structures

2015 ◽  
Vol 1124 ◽  
pp. 209-218
Author(s):  
Pavel Svoboda ◽  
Karl Heinz Winter
Keyword(s):  
Practical Experience ◽  
Elastic Behavior ◽  
Complex Structures ◽  
Structural Elements ◽  
Structural Members ◽  
Long Term Effects ◽  
Linear Elastic ◽  
The Past ◽  
Current Design

Reinforced and pre-stressed concrete have been used increasingly for various kinds of complex structures in the past decades. The structures assembled from panels belong into this group. The current design methods rely on linear elastic analyses based on empirically derived material laws assuming homogeneous and isotropic material. Practical experience and various investigations however have indicated that majority of structures and structural elements are in fact stressed beyond the range of linear elastic behavior. In addition, long term effects may have a significant influence on the structural behavior of this category of structures and structural members.

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