2,146 research outputs found
Glossectomy in the severe maxillofacial vascular malformation with jaw deformity: a rare case report
Electromagnetic form factors of pion and rho in the three forms of relativistic kinematics
The electromagnetic form factors of the and the are obtained
using the three forms of relativistic kinematics, instant form, point form and
(light) front form. Simple representations of the mass operator together with
single quark currents are employed with all the forms. The Poincar\'e covariant
current operators are generated by the dynamics from single-quark currents that
are covariant under the kinematic subgroup. Front and instant forms allow to
reproduce the available data for the pion form factor. On the other hand point
form is not able to reproduce qualitatively the experimental data with
reasonable values for the wave function parameters. For the
electromagnetic form factors, instant and front forms provide a consistent
picture. The obtained results do not depend appreciably on the wave function
used.Comment: 10 pages, color figures. Revised references and discussion. Accepted
in Phys. Letts.
Electroweak properties of the , and in the three forms of relativistic kinematics
The electromagnetic form factors, charge radii and decay constants of pion, K
and K*(892) are calculated using the three forms of relativistic kinematics:
instant form, point form and (light) front form. Simple representations of the
mass operator together with single quark currents are employed with all the
forms. Making use of previously fixed parameters, together with the constituent
quark mass for the strange quark, a reasonable reproduction of the available
data for form factors, charge radii and decay constants of pion, rho, K and
K*(892) is obtained in front form. With instant form a similar description, but
with a systematic underestimation of the vector meson decay constants is
obtained using two different sets of parameters, one for pion and rho and
another one for K and K*(892). Point form produces a poor description of the
data.Comment: Accepted in Eur. Phys. Jour. A (2005
Development of an approximate construction duration prediction model during the project planning phase for general office buildings
Accurate prediction of the construction duration is imperative to the reliable cash flow analysis during the project planning phase when feasibility analysis is carried out. However, lack of information and frequent changes that occur as a result of a negotiation process between the owner and the designer in defining the project scope make it difficult to compute real-time construction duration. Domestic and foreign models for calculating the construction durations cannot be readily applied to computation of construction duration for general office buildings in Korea specifically during the project planning phase as there is a limit in its applicability due to numerous restrictions. Moreover, there are no preceding studies suggesting different computational approaches to predict the entire construction duration for office buildings with the approximate construction duration concept during planning phase. Therefore, based on the collected performance data, this study proposes a multiple linear regression model that facilitates reliable prediction of approximate construction duration for office buildings in the project planning phase. The model will allow the owner and other stakeholders to predict the real-time construction duration using the basic information on office buildings and to assess the construction durations incorporating frequent changes during the project planning phase
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Assessment of RELAP/MOD3 using BETHSY 6.2TC 6-inch cold leg side break comparative test
This report presents the results of the RELAP5/MOD3 Version 7j assessment on BETHSY 6.2TC. BETHSY 6.2TC test corresponding to a six inch cold leg break LOCA of the Pressurizer Water Reactor(PWR). The primary objective of the test was to provide reference data of two facilities of different scales (BETHSY and LSTF facility). On the other hand, the present calculation aims at analysis of RELAP5/N4OD3 capability on the small break LOCA simulation, The results of calculation have shown that the RELAP5/MOD3 reasonably predicts occurrences as well as trends of the major phenomena such as primary pressure, timing of loop seal clearing, liquid hold up, etc. However, some disagreements also have been found in the predictions of loop seal clearing, collapsed core water level after loop seal clearing, and accumulator injection behaviors. For better understanding of discrepancies in same predictions, several sensitivity calculations have been performed as well. These include the changes of two-phase discharge coefficient at the break junction and some corrections of the interphase drag term. As result, change of a single parameter has not improved the overall predictions and it has been found that the interphase drag model has still large uncertainties
Inducible Nucleosome Depletion at OREBP-Binding-Sites by Hypertonic Stress
Background: Osmotic Response Element-Binding Protein (OREBP), also known as TonEBP or NFAT5, is a unique transcription factor. It is hitherto the only known mammalian transcription factor that regulates hypertonic stress-induced gene transcription. In addition, unlike other monomeric members of the NFAT family, OREBP exists as a homodimer and it is the only transcription factor known to bind naked DNA targets by complete encirclement in vitro. Nevertheless, how OREBP interacts with target DNA, also known as ORE/TonE, and how it elicits gene transcription in vivo, remains unknown. Methodology: Using hypertonic induction of the aldose reductase (AR) gene activation as a model, we showed that OREs contained dynamic nucleosomes. Hypertonic stress induced a rapid and reversible loss of nucleosome(s) around the OREs. The loss of nucleosome(s) was found to be initiated by an OREBP-independent mechanism, but was significantly potentiated in the presence of OREBP. Furthermore, hypertonic induction of AR gene was associated with an OREBPdependent hyperacetylation of histones that spanned the 59 upstream sequences and at least some exons of the gene. Nevertheless, nucleosome loss was not regulated by the acetylation status of histone. Significance: Our findings offer novel insights into the mechanism of OREBP-dependent transcriptional regulation and provide a basis for understanding how histone eviction and transcription factor recruitment are coupled. © 2009 Tong et al.published_or_final_versio
Phylogeography of the endangered orchids Cypripedium japonicum and Cypripedium formosanum in East Asia: Deep divergence at infra- and interspecific levels
To date, little is known about the past evolutionary trajectories of rare and endangered orchids native to mainland China, Japan, and Korea (the CJK region). In this study, we focus on two endangered orchids, Cypripedium japonicum (present in the three countries) and C. formosanum (endemic to Taiwan), to understand the divergence/speciation models that would have been operating in this group, including genetic diversity, geographic structure, and colonization pathways across the region. Using a combination of five cpDNA regions, we reconstructed phylogenetic trees and investigated the genetic diversity/structure of 20 populations. Ecological niche modeling was used to gain insight into the paleodistribution and dispersal corridors at the Last Glacial Maximum and to survey climatic niche differences. Populations from mainland China + Korea, Japan, and Taiwan formed three distinct monophyletic lineages and were placed into separate genetic clusters, agreeing with geographic barriers and species boundaries. Populations of C. japonicum in mainland China harbored the highest diversity, suggesting the presence of multiple glacial refugia. The Korean populations would have originated from either western/central or eastern China, probably using a dispersal corridor across the East China Sea shelf. The divergence of C. formosanum is proposed under an allopatric speciation model, also highly influenced by a climate niche shift. In the context of previous studies, a deep divergence in cpDNA sequences between Chinese + Korean and Japanese populations of C. japonicum may be taken as an example of the speciation events of the CJK flora since the late Neogene that have led to its current species richness.This study was supported by the Biodiversity Survey, Observation and Assessment Program of the Ministry of Ecology and Environment of China to HZT and by Basic Science Program through the National Research Foundation of Korea (NRF-2017R1A2B4012215) to MGC, and funded by the Ministry of Science and ICT of the Republic of Korea (NRF-2020R1I1A3074635) to MYC.INTRODUCTION
MATERIALS AND METHODS
Study species
Population sampling
DNA extraction
cpDNA-PCR optimum primer selection
cpDNA sequence alignment and assembly
Haplotype distribution, phylogenetic analyses, and genetic diversity
Genetic differentiation and structure
Mismatch distribution analysis, neutrality detection, and demographic history
ENM and population connectivity
Niche comparisons in E-space
RESULTS
Haplotype distribution and phylogeny
Genetic diversity
Genetic differentiation and structure
Mismatch distribution analysis, neutrality detection, and demographic history
ENM and population connectivity
Niche comparisons in E-space
DISCUSSION
Deep genetic and climatic divergence of Cypripedium sect. Flabellinervia in the CJK region: taxonomic considerations
Haplotype and nucleotide diversity in Cypripedium sect. Flabellinervia: inference of glacial refugia and demographic history
Origin of Korean populations of Cypripedium japonicum
Origin of Cypripedium formosanum
CONCLUSIONS
AUTHOR CONTRIBUTIONS
ACKNOWLEDGEMENTS
Appendix 1: The cpDNA sequence information of Cypripedium sect. Flabellinervia deposited in the GenBank databas
Strongyloidiasis Presenting as Yellowish Nodules in Colonoscopy of an Immunocompetent Patient
Strongyloides stercoralis is endemic to tropical and subtropical regions, and infections are usually asymptomatic. However, immunocompromised patients, such as those receiving immunosuppressive therapy, high-dose steroids, or chemotherapy, can develop fatal hyperinfections. An 84-year-old man without any symptoms was diagnosed with strongyloidiasis during a regular screening colonoscopy. His medical history only involved a gastric endoscopic submucosal dissection for early gastric cancer 6 months previously. Few cases have been published about asymptomatic strongyloidiasis diagnosed in an immunocompetent host via endoscopic mucosal resection with characteristic colonoscopic findings. We report a case of colon-involved asymptomatic strongyloidiasis with specific colonic findings of yellowish-white nodules. This finding may be an important marker of S. stercoralis infection, which could prevent hyperinfections
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