1,408 research outputs found
Corrosion Resistance Studies of Austenitic Stainless Steel Grades in Molten Zinc-Aluminum Alloy Galvanizing Bath
The corrosion inhibition performance and
mechanical behavior of galvanized and heat-treated four
newly developed austenitic stainless steel grades and type
316L austenitic stainless steel for application as sink rolls
in galvanizing baths of 0.14–0.21 wt.% aluminum was
investigated and compared through immersion corrosion
test to determine the weight loss between 168 and 504 h,
tensile test, and Charpy impact test. The delta ferrite content
of the test samples was observed and estimated
through optical microscopy, feritscope, and ONRL diagram.
Scanning electron microscopy and energy dispersive
spectroscopy were used to characterize the surface
microstructure, morphology, and chemical composition of
the galvanized coating of the steel samples. Result showed
that only two of the newly developed stainless steel compositions
were selected for use in fabrication of galvanizing
hardware based on the comparisons of corrosion and
mechanical performances of tested alloy
DNA methylation-based age prediction and telomere length in white blood cells and cumulus cells of infertile women with normal or poor response to ovarian stimulation.
An algorithm assessing the methylation levels of 353 informative CpG sites in the human genome permits accurate prediction of the chronologic age of a subject. Interestingly, when there is discrepancy between the predicted age and chronologic age (age acceleration or AgeAccel ), patients are at risk for morbidity and mortality. Identification of infertile patients at risk for accelerated reproductive senescence may permit preventative action. This study aimed to assess the accuracy of the epigenetic clock concept in reproductive age women undergoing fertility treatment by applying the age prediction algorithm in peripheral (white blood cells [WBCs]) and follicular somatic cells (cumulus cells [CCs]), and to identify whether women with premature reproductive aging (diminished ovarian reserve) were at risk of AgeAccel in their age prediction. Results indicated that the epigenetic algorithm accurately predicts age when applied to WBCs but not to CCs. The age prediction of CCs was substantially younger than chronologic age regardless of the patient\u27s age or response to stimulation. In addition, telomeres of CCs were significantly longer than that of WBCs. Our findings suggest that CCs do not demonstrate changes in methylome-predicted age or telomere-length in association with increasing female age or ovarian response to stimulation
Temperature variation on root surface with three root-end cavity preparation techniques
Introduction. Thermal changes can occur on the external root surface when root-end cavity preparation is performed, which may damage periodontal ligament cells and alveolar bone. Objective. The purpose of this study was to evaluate the temperature changes during preparation of the root-end cavities at 1 and 3 mm to the sectioned apical root surfaces when either tungsten carbide round bur, diamond round bur or ultrasonic diamond tip was used. Methods. Root-end resection was performed at 90° to the long axis of the root, 3 mm from the apex. Specimens were randomly divided into three groups of 12 teeth each for three different root-end cavity preparation techniques to be used, i.e. tungsten carbide bur, diamond bur and ultrasonic diamond retro tip. Thermocouples were used to measure temperature changes at 1 mm (T1) and 3 mm (T2) to the cutting plane during the preparations. Results. For T1, the lowest and the highest mean temperature increases of 3.53°C and 4.34°C were recorded for the carbide and diamond burs, respectively. For T2, the lowest and the highest mean temperature increases of 2.62°C and 4.39°C where recorded for the carbide and diamond burs, respectively. The mean temperatures with the ultrasonic tip were 3.68 and 3.04 ºC at T1 and T2 region, respectively. For root-end preparation, the ultrasonic preparation technique took the shortest preparation time (10.25 sec) and the diamond bur took the longest time (28.17 sec). Conclusion. Ultrasonic retro tips and burs caused temperature to rise from 2.62° to 4.39°C, and these rises were within safety levels
Phylogenetic analysis of some fungi species in West Kazakhstan based on nuclear ribosomal DNA ITS sequences
In this study, phylogenetic analysis of some fungal species distributed in West Kazakhstan was performed based on ITS sequences. All of the mushroom samples were collected from different regions of West Kazakhstan and brought to the laboratory. Total genomic DNA was extracted using a GeneMark commercial kit. ITS1 and ITS4 primers were used for the amplification of the ITS region in PCR analyses. The resulting DNA sequences were then edited using BioEdit and FinchTV. For phylogenetic analysis used MEGA 6.0 program. As a result of the study, ITS sequences ranged from 532 to 715 nucleotides, while the divergence values of the sequences differed between 0.000 and 0.468. The maximum likelihood tree constructed using ITS sequences consists of two clades. According to the phylogenetic analysis results obtained using other fungal species, ITS results were found to be a good indicator for the differentiation of fungal genera
New monitoring confirms regular breeding of the Mediterranean monk seal in Northern Cyprus
The Endangered Mediterranean monk seal Monachus monachus is one of the most threatened marine mammals. Across Cyprus, suitable habitat and presence of monk seals is well documented and, recently, camera-trap surveys in Southern Cyprus found there to be pupping. We present results of the first camera-trap surveys in Northern Cyprus spanning the pupping period. Four adult/subadults and three pups were identified in three of eight caves monitored with camera traps. One site on the north-west of the island supported at least three adult/subadult seals and pupping occurred there in 3 consecutive years. The breeding and resting sites identified require urgent conservation to manage threats of disturbance, coastal development and fisheries bycatch. To determine the size of this population, a long-term survey with greater and more continuous coverage is required
Higgs Production and Decay from TeV Scale Black Holes at the LHC
We perform detailed study of the Higgs production and decay, when Higgs is
emitted from the black holes produced in proton-proton collisions at the Large
Hadron Collider. We show that black hole production can significantly enhance
the signal for the Higgs search at the LHC. We evaluate rapidity distribution
of diphotons and transverse momentum distribution of bottom quarks, photons,
tau leptons, top quarks and W bosons from Higgs decay, when Higgs is emitted
from the black hole and also in case when these particles are produced directly
from the black hole evaporation. We compare our results with the standard model
backgrounds. We find that Higgs production from black holes is dominant over
standard model production for GeV, when TeV. Diphotons
from Higgs, when Higgs is produced from evaporation of black holes, are
dominant over the standard model prediction, for diphoton rapidity , while bottom quarks are dominant over QCD background for
large bottom quark transverse momentum, GeV, when TeV. We
show that measurements of the photon and bottom quark transverse momentum
distribution can provide valuable information about the value of the
fundamental Planck scale. We also propose a new signal for black hole
production at the LHC, an onset of increasing transverse momentum distribution
of bottom quarks with large transverse momentum.Comment: 28 pages, 10 figures, 2 tables. Typo corrected; version accepted for
publication in Phys. Rev.
A Comparative Analysis of Treatment-Related Changes in the Diagnostic Biomarker Active Metalloproteinase-8 Levels in Patients with Periodontitis
Background: Previous studies have revealed the potential diagnostic utility of aMMP-8, an active form of MMP-8, in periodontal and peri-implant diseases. While non-invasive point-of-care (PoC) chairside aMMP-8 tests have shown promise in this regard, there is a dearth of literature on the evaluation of treatment response using these tests. The present study aimed to investigate treatment-related changes in aMMP-8 levels in individuals with Stage III/IV—Grade C periodontitis compared to a healthy control group, using a quantitative chairside PoC aMMP-8 test, and to determine its correlation with clinical parameters. Methods: The study included 27 adult patients (13 smoker, 14 non-smoker) with stage III/IV-grade C periodontitis and 25 healthy adult subjects. Clinical periodontal measurements, real-time PoC aMMP-8, IFMA aMMP-8, and Western immunoblot analyses were performed before and 1 month after anti-infective scaling and root planing periodontal treatment. Time 0 measurements were taken from the healthy control group to test the consistency of the diagnostic test. Results: Both PoC aMMP-8 and IFMA aMMP-8 tests showed a statistically significant decrease in aMMP-8 levels and improvement in periodontal clinical parameters following treatment (p 0.05). Treatment also reduced MMP-8 immunoreactivity and activation as demonstrated by Western immunoblot analysis. Conclusion: The PoC aMMP-8 test shows promise as a useful tool for the real-time diagnosis and monitoring of periodontal therapy
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