1,454 research outputs found
Revisit assignments of the new excited states with QCD sum rules
In this article, we distinguish the contributions of the positive parity and
negative parity states, study the masses and pole residues of the
1S, 1P, 2S and 2P states with the spin and
using the QCD sum rules in a consistent way, and revisit the
assignments of the new narrow excited states. The predictions
support assigning the to be the 1P state with
, assigning the to be the 1P
state with or the 2S state with
, and assigning to be the 2S
state with .Comment: 19 pages, 22 figures. arXiv admin note: text overlap with
arXiv:1705.0774
A single chemosensor for multiple analytes: fluorogenic and ratiometric absorbance detection of ZnÂČâș, MgÂČâș and Fâ», and its cell imaging
A simple coumarin based sensor 1 has been synthesized from the condensation reaction of 7-hydroxycoumarin and ethylenediamine via the intermediate 7-hydroxy-8-aldehyde-coumarin. As a multiple analysis sensor, 1 can monitor ZnÂČâș with the fluorescence enhanced at 457 nm, and ratiometric detection at 290 nm, 350 nm and 420 nm in DMF/HâO (1/4, v/v) medium. Sensor 1 can also monitor MgÂČâș with the fluorescence enhanced at 430 nm, and ratiometric detection at 290 nm, 370 nm and 430 nm in DMF medium through the interaction of chelation enhance fluorescence (CHEF) with metal ions. Furthermore, 1 also can monitor Fâ» with the fluorescence enhanced at 460 nm, and ratiometric detection at 290 nm and 390 nm in DMF medium simultaneously via hydrogen bonding and deprotonation with Fâ anion. Spectral titration, isothermal titration calorimetry and mass spectrometry revealed that the sensor formed a 1:1 complex with MgÂČâș, ZnÂČâș or Fâ», with stability constants of 4.5 Ă 10â¶, 3.4 Ă 10â¶, 8.0 Ă 10⎠Mâ»1 respectively. The complexation of the ions by 1 was an exothermic reaction driven by entropy processes. Furthermore, the sensor exhibits good membrane-permeability and was capable of monitoring at the intracellular ZnÂČâș level in living cells
Dimensionality Reduction in Deep Learning for Chest X-Ray Analysis of Lung Cancer
Efficiency of some dimensionality reduction techniques, like lung
segmentation, bone shadow exclusion, and t-distributed stochastic neighbor
embedding (t-SNE) for exclusion of outliers, is estimated for analysis of chest
X-ray (CXR) 2D images by deep learning approach to help radiologists identify
marks of lung cancer in CXR. Training and validation of the simple
convolutional neural network (CNN) was performed on the open JSRT dataset
(dataset #01), the JSRT after bone shadow exclusion - BSE-JSRT (dataset #02),
JSRT after lung segmentation (dataset #03), BSE-JSRT after lung segmentation
(dataset #04), and segmented BSE-JSRT after exclusion of outliers by t-SNE
method (dataset #05). The results demonstrate that the pre-processed dataset
obtained after lung segmentation, bone shadow exclusion, and filtering out the
outliers by t-SNE (dataset #05) demonstrates the highest training rate and best
accuracy in comparison to the other pre-processed datasets.Comment: 6 pages, 14 figure
Study on key technologies of energy-saving and environment-protective pumps
To meet energy-saving and environment-protective purpose, a series of plastic
pumps are developed by composite molding. There are four key techniques
involved, firstly, plastic hydraulic components with light-weight; secondly,
steel barrel as a pump casing and a connection component as well; thirdly,
floating impeller strategy where impeller is drifting freely along shaft; and
lastly, a self balancing impeller technique which can totally keep axial
force balancing. The manufacturing process is energy-saving, and the
components can be recycled, which have great potentials for conservation of
environment
Current Reversals in a inhomogeneous system with asymmetric unbiased fluctuations
We present a study of transport of a Brownian particle moving in periodic
symmetric potential in the presence of asymmetric unbiased fluctuations. The
particle is considered to move in a medium with periodic space dependent
friction. By tuning the parameters of the system, the direction of current
exhibit reversals, both as a function of temperature as well as the amplitude
of rocking force. We found that the mutual interplay between the opposite
driving factors is the necessary term for current reversals.Comment: 9 pages, 7 figure
CircRNA PDE3B regulates tumorigenicity via the miR-136-5p/MAP3K2 axis of esophageal squamous cell carcinoma
Background. CircRNA has a covalently
closed circular conformation and a stable structure.
However, the exact role of circRNA in esophageal
squamous cell carcinoma (ESCC) remains uncertain.
The purpose of this study was to explore the role of
hsa_circ_0000277 (circ_PDE3B) in ESCC.
Methods. The expression levels of circ_PDE3B,
miR-136-5p and mitogen-activated protein kinase kinase
kinase 2 (MAP3K2) in ESCC tissues and cells were
detected by quantitative real-time polymerase chain
reaction (qRT-PCR) or western blot. The proliferation
ability of EC9706 and KYSE30 cells was detected by
clonal formation, 5-ethynyl-2â-deoxyuridine (EdU) and
3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-Htetrazolium bromide (MTT) assays. Flow cytometry was
used to detect the apoptosis rate of cells. Transwell assay
was used to detect the invasion ability of EC9706 and
KYSE3 cells. The relationship between miR-136-5p and
circ_PDE3B or MAP3K2 was verified by dual-luciferase
reporter assay and RNA pull-down, and the effect of
circ_PDE3B on tumor growth in vivo was explored
through tumor transplantation experiment. Immunohistochemistry (IHC) assay was used to detect MAP3K2 and
Ki67 expression in mice tumor tissues.
Results. The results showed that circ_PDE3B was
highly expressed in ESCC tissues and cells. Downregulated circ_PDE3B expression in ESCC cells
significantly reduced cell proliferation, migration and
invasion. Circ_PDE3B served as a sponge for miR-136-
5p, and miR-136-5p inhibition reversed the roles of
circ_PDE3B knockdown in ESCC cells. MAP3K2 was a
direct target of miR-136-5p, and miR-136-5p targeted
MAP3K2 to inhibit the malignant behaviors of ESCC
cells. Furthermore, circ_PDE3B regulated MAP3K2
expression by sponging miR-136-5p. Importantly,
circ_PDE3B knockdown inhibited tumor growth in vivo.
Conclusions. In conclusion, circ_PDE3B acted as
oncogenic circRNA in ESCC and accelerated ESCC
progression by adsorption of miR-136-5p and activation
of MAP3K2, supporting circ_PDE3B as a potential
therapeutic target for ESCC
A reversible and visible colorimetric/fluorescent chemosensor for AlÂłâș+ and Fâ» ions with a Large Stoke's shift
A quinoline-vinyl-dihydroxylphenyl linkage comprising a donor-Ï-bridge-acceptor structural motif, in which the quinoline serves as an electron-withdrawing core, has been synthesized and used as a fluorescent sensor (2) for the recognition of AlÂłâș+ and Fâ» by colorimetry/fluorescence. The sensor 2 exhibited little fluorescence due to excited-state intramolecular proton transfer from the hydroxyl oxygens to the nitrogen of the quinoline moiety. By contrast, on coordination of AlÂłâș+ or Fâ», sensor 2 afforded strong fluorescence. A reversible âoffâonâ optical switching mode has been constructed by sequential inputs from AlÂłâș+ and Fâ» ions to the sensor 2 via different excitation and emission wavelengths. ÂčH NMR and IR spectroscopic analysis revealed that the AlÂłâș+ is coordinated to the quinoline nitrogen and phenolic oxygen atoms, whereas the Fâ» center is only coordinated by two phenolic oxygen atoms
An easy-to-use evaluation framework for benchmarking entity recognition and disambiguation systems
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