4,831 research outputs found
An extremely rare but considerably important device-related complication of percutaneous atrial septal defect closure
IMPACT ON PRESENTEEISM OF THE CONSCIENTIOUSNESS TRAIT: A HEALTH SECTOR CASE STUDY
Our purpose in this study was to examine the relationship between presenteeism and the conscientiousness
trait as an individual-level predictor of employee health and productivity. We
used convenience sampling to recruit 168 Turkish health employees, who completed measures
of conscientiousness and presenteeism. The findings revealed that in a work outcomes context,
the conscientiousness trait was positively related to the noncompletion of work dimension of
presenteeism, the focus of which is on work outcomes. However, the relationship between the
conscientiousness trait and the distraction dimension of presenteeism was nonsignificant. Our
findings have implications for managers and organizations, who should be proactive in taking
preventative precautions to mitigate the possible negative effects of presenteeism behaviors
The Sorption Behavior of Cs+ ion On Clay Minerals and Zeolite in Radioactive Waste Managemen: Sorption Kinetics and Themodynamics
Cataloged from PDF version of article.In this work, Cs+ ion sorption on some clays and zeolite were investigated. Cs-137 was used as a tracer. Activities were measured with a NaI crystal gamma counter. The particle size distribution was determined by a laser sizer. Surface area of the particles were determined by BET (Brunauer, Emmett and Teller method). Structure analysis was made by using X-ray diffraction. The chemical compositions of the solid samples were determined using a ICAP-OE spectrometer. Kinetic and thermodynamic parameters were determined. Due to very high uptake results; clay and zeolite can be proposed as a good sorbents in waste management considerations
Counterintuitive consequences of COVID-19 on healthcare workers: A meta-analysis of the relationship between work engagement and job satisfaction
Data availability statement: The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.Copyright © 2022 Yildiz, Yildiz, Ozbilgin and Yildiz. Background: Studies conducted in the health sector have determined a positive relationship between job satisfaction and work engagement. However, this paper reveals that this relationship turns into a negative or non-significant relationship during the COVID-19 pandemic. We explore the reasons for inconsistency in research findings in this critical period through a meta-analysis.
Methods: This study was conducted according to the PRISMA guidelines and PICO framework. Online databases including Web of Science, Scopus, PubMed, ProQuest, Google Scholar, and additional records from other databases were searched without any time limitation, and all studies published in English that reported the correlation between work engagement and job satisfaction were included in the analysis. In total, 36 individual correlation coefficients were synthesized. R statistical language was used to analyze the data.
Result: A total of 36 studies with a sample size of 16,087 were synthesized. The overall effect size was found as r = 0.57 (95% CI [0.50–0.64]). While the moderating effect of national culture was not statistically significant, presence of COVID-19 as the significant moderator explained 37.08% of effect size heterogeneity. Such that the presence of COVID-19 has transformed the positive relationship between work engagement and job satisfaction into a negative but statistically non-significant relationship.
Conclusion: This study empirically challenges the existing assumptions about the positive link between work engagement and job satisfaction. The results of the research can be a guide for managers and policymakers. Specifically, based on these results, different mechanisms can be put in place to support work engagement and, in turn, job satisfaction in the COVID-19 process.2219-International Postdoctoral Research Fellowship Program for Turkish Citizens of TUBITAK (The Scientific and Technological Research Council of Turkey)
Interaction Between Motor Domains Can Explain the Complex Dynamics of Heterodimeric Kinesins
Motor proteins are active enzyme molecules that play a crucial role in many
biological processes. They transform the chemical energy into the mechanical
work and move unidirectionally along rigid cytoskeleton filaments.
Single-molecule experiments suggest that motor proteins, consisting of two
motor domains, move in a hand-over-hand mechanism when each subunit changes
between trailing and leading positions in alternating steps, and these subunits
do not interact with each other. However, recent experiments on heterodimeric
kinesins suggest that the motion of motor domains is not independent, but
rather strongly coupled and coordinated, although the mechanism of these
interactions are not known. We propose a simple discrete stochastic model to
describe the dynamics of homodimeric and heterodimeric two-headed motor
proteins. It is argued that interactions between motor domains modify free
energy landscapes of each motor subunit, and motor proteins still move via the
hand-over-hand mechanism but with different transitions rates. Our calculations
of biophysical properties agree with experimental observations. Several ways to
test the theoretical model are proposed.Comment: To appear in New J. Phy
Fractional Super Lie Algebras and Groups
n^{th} root of a Lie algebra and its dual (that is fractional supergroup)
based on the permutation group invariant forms are formulated in the Hopf
algebra formalism. Detailed discussion of -graided algebras is
done.Comment: 13 pages, detailed discussion of -graided is adde
Understanding Mechanochemical Coupling in Kinesins Using First-Passage Time Processes
Kinesins are processive motor proteins that move along microtubules in a
stepwise manner, and their motion is powered by the hydrolysis of ATP. Recent
experiments have investigated the coupling between the individual steps of
single kinesin molecules and ATP hydrolysis, taking explicitly into account
forward steps, backward steps and detachments. A theoretical study of
mechanochemical coupling in kinesins, which extends the approach used
successfully to describe the dynamics of conventional motor proteins, is
presented. The possibility of irreversible detachments of kinesins from the
microtubules is also explicitly taken into account. Using the method of first-
passage times, experimental data on the mechanochemical coupling in kinesins
are fully described using the simplest two-state model. It is shown that the
dwell times for the kinesin to move one step forward or backward, or to
dissociate irreversibly are the same, although the probabilities of these
events are different. It is concluded that the current theoretical view, that
only the forward motion of the motor protein molecule is coupled to ATP
hydrolysis, is consistent with all available experimental observations for
kinesins.Comment: Submitted to Biophysical Journa
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