91 research outputs found
Necessary and sufficient conditions for quasi-strongly regularity of Graph Product
A -regular graph () with vertices is called a quasi-strongly regular graph with parameter (\lambda\in\NN) if any two adjacent vertices have exactly neighbors in common.A graph product is a binary operation on graphs. In this paper we prove some necessary and sufficient conditions for Decartes Product, Tensor Product, Lexicographical product and Strong product to be quasi-strongly regular
High-Resolution, Mid-Infrared Color Temperature Mapping of the Central 10 Arcseconds of the Galaxy
The neighborhood of the Galactic black hole boasts a plethora of extended
interstellar gas and dust features as well as populations of compact
(unresolved, or marginally resolved) features such as the G objects. Most are
well manifested in the infrared. To disentangle and characterize the infrared
structure of extended features and identify compact sources, we used 3.8~m
(L' filter) data from the NIRC2 imager at the Keck Observatory and 8.6~m
(PAH1 filter) data from the VISIR imager at the Very Large Telescope (VLT) to
produce the highest-resolution mid-IR color-temperature map of the inner
half-parsec of the Galactic Center to date. From this map, we compile a catalog
of features that stand out from their background. In particular, we identify 33
compact sources that stand out against the local background temperature, 11 of
which are newly identified and are candidates for being members of the G
objects population. Additionally, we resolve and newly characterize the
morphology of several known extended features. These results prepare the way
for ongoing and future JWST studies that have access to a greater range of
mid-infrared wavelengths, and thus will allow for refined estimation of the
trends of dust temperatures.Comment: 22 pages, 14 figure
Bit-Interleaved Coded Modulation Systems with Iterative Decoding and Partial Reusing QAM Signal Points
A new method of reusing a subset of an M-QAM signal constellation is presented for Bit-Interleaved Coded Modulation systems with Iterative Decoding (BICM-ID). In addition to the remapping of high-energy signals to low-energy signals in order to save the average signal energy as a shaping technique known so far, a new scheme of remapping low-energy signals to high-energy signals is proposed in order to gain the equivalent distance when decoding bits, often called the Squared Euclidean Weights (SEW). Numerical analysis and simulation results show that the partial reuse of the signals in the BICM-ID system with 16-QAM can improve the system performance in terms of lowering the bit error rate in the error floor region
Organic - Inorganic Hybrid Luminescent Composite for Solid-state Lighting
White light emitting diodes (WLEDs) made by coating organic and inorganic hybrid composites on blue LED chips. Y3Al5O12:Ce (YAG:Ce) nano inorganic powder prepared by low-temperature Sol-Gel method exhibited broad green emission with the peak at 521 nm. Poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) polymer has high luminescence efficiency and red emission peak at 590 nm. The white light was obtained by mixing blue light from emission of the blue LED chip - Indium Gallium Nitride (InGaN) and green-red light from the fluorescence of nano- YAG:Ce and MEH-PPV polymer hybrid composite. The hybrid nanocomposite-based WLEDs exhibited broad band emission spectra from blue light to red wavelengths and provided the white light with a CIE-1931 coordinate of x = 0.2986, y = 0.2620 and a colour rendering index Ra = 84.36. The results suggest a potential application of nanocomposite based WLEDs in efficient solid-state lighting
Evaluation of Anterior Chamber Depth and Anterior Chamber Angle Changing After Phacoemulsification in the Primary Angle Close Suspect Eyes
BACKGROUND: Phacoemulsification surgery has the ability to deeply alter the segment anterior morphology, especially in eye with shallow anterior chamber (AC), narrow anterior chamber angle (ACA). However, the changes of anterior chamber depth (ACD) and ACA on the close angle suspect eyes after phacoemulsification have not been mentioned in many studies. So, we conduct this research.
AIM: To evaluate the alteration in the ACA and ACD after phacoemulsification in the close angle suspect eyes.
METHODS: Interventional study with no control group. Subjects were the primary angle closure suspect (PACS) eyes, that were operated by phacoemulsification with intraocular lens (IOL) at Glaucoma Department of VNIO from December 2017 to October 2018.
RESULTS: 29 PACS eyes with cataract were operated by phacoemulsification with intraocular lens. After 3 months of monitoring, the average ACD augmented from 2.082 ± 0.244 to 3.673 ± 0.222 mm. AOD500 increase from 0.183 ± 0.088 to 0.388 ± 0.132 μm, AOD750 increased from 0.278 ± 0.105 to 0.576 ± 0.149 μm. The TISA500 enlarged from 0.068 ± 0.033 to 0.140 ± 0.052 mm2, TISA750 enlarged from 0.125 ± 0.052 to 0.256 ± 0.089 mm2 at the third month (p < 0.01).
CONCLUSION: Phacoemulsification surgery increases the ACD and enlarged the angle in the PACS eyes
Polyphasic evaluation and cytotoxic investigation of isolated cyanobacteria with an emphasis on potent activities of a Scytonema strain
DATA AVAILABILITY STATEMENT : The datasets presented in this study can be found in
online repositories. The names of the repository/repositories
and accession number(s) can be found in the
article/supplementary material.Cyanobacteria are phototrophic organisms widely found in most types of
natural habitats in the tropical regions of the world. In this study, we isolated
and identified cyanobacterial strains from paddy soil in Hanoi (Vietnam)
and investigated their cytotoxic activities. Five isolated cyanobacterial strains
showed distinctive profiles of gene sequences (rRNA 16S and rbcL),
phylogenetic placements, and morphological characteristics. Based on the
polyphasic evaluation, they were classified as Scytonema bilaspurense NK13,
Hapalosiphon welwitschii MD2411, Aulosira sp. XN1103, Desikacharya sp.
NS2000, and Desmonostoc sp. NK1813. The cytotoxic screening revealed that
the extract of strain Scytonema bilaspurense NK13 exhibited potent cytotoxic
activities against four human cell lines of HeLa cells, OVCAR-8 cells, HaCaT
cells, and HEK-293T cells, with IC50 values of 3.8, 34.2, 21.6, and 0.6μg/mL,
respectively. This is the first time a well-classified Scytonema strain from
tropical habitat in Southeast Asia has been recognized as a potential producer
of cytotoxic compounds.The Vietnam National University, Hanoi (VNU).http://www.frontiersin.org/Microbiologyam2023BiochemistryGeneticsMicrobiology and Plant Patholog
Differential Cytotoxicity of Curcumin-Loaded Micelles on Human Tumor and Stromal Cells
peer reviewedAlthough curcumin in the form of nanoparticles has been demonstrated as a potential anti-tumor compound, the impact of curcumin and nanocurcumin in vitro on normal cells and in vivo in animal models is largely unknown. This study evaluated the toxicity of curcumin-loaded micelles in vitro and in vivo on several tumor cell lines, primary stromal cells, and zebrafish embryos. Breast tumor cell line (MCF7) and stromal cells (human umbilical cord vein endothelial cells, human fibroblasts, and human umbilical cord-derived mesenchymal stem cells) were used in this study. A zebrafish embryotoxicity (FET) assay was conducted following the Organisation for Economic Co-operation and Development (OECD) Test 236. Compared to free curcumin, curcumin PM showed higher cytotoxicity to MCF7 cells in both monolayer culture and multicellular tumor spheroids. The curcumin-loaded micelles efficiently penetrated the MCF7 spheroids and induced apoptosis. The nanocurcumin reduced the viability and disturbed the function of stromal cells by suppressing cell migration and tube formation. The micelles demonstrated toxicity to the development of zebrafish embryos. Curcumin-loaded micelles demonstrated toxicity to both tumor and normal primary stromal cells and zebrafish embryos, indicating that the use of nanocurcumin in cancer treatment should be carefully investigated and controlled.3. Good health and well-bein
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