Michał Krzemiński - Publications - Bridge of Knowledge

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Year 2021
  • Measured and predicted freeze-thaw days frequencies in climate change conditions in central Poland
    Publication

    - PeerJ - Year 2021

    The rate of progression of geomorphological phenomena is greatly influenced by freeze-thaw processes. In the face of air temperature increasing over the past few decades, a question of the future impact of these processes arises, notably in the temperate and cold climate zones. Using the mean, maximum and minimum daily air temperature data in the period 1951–2018 obtained from three weather stations located in the vicinity of Jeziorsko...

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  • On asymptotic periodicity of kernel double Markovian operators
    Publication

    It is proved that a kernel, doubly Markovian operator T is asymptotically periodic if and only if its deterministic σ-field Σd(T)(equivalently Σd(T∗)) is finite. It follows that kernel doubly Markovian operator T is asymptotically periodic if and only if T∗ is asymptotically periodic.

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  • Polish Adaptation of the Pregnancy-Related Anxiety Questionnaire—Revised 2 for All Pregnant Women
    Publication
    • A. Michalik
    • L. Wójcicka
    • A. Zdun-Ryżewska
    • A. Czerwińska-Osipiak
    • M. Krzemiński
    • J. Olszewska
    • D. Klasa-Mazurkiewicz
    • A. C. Huizink

    - Healthcare - Year 2021

    Pregnancy-related anxiety (PrA) is a specific type of anxiety characteristic of the perinatal period. PrA can affect pregnancy and birth. However, no validated tool exists to measure PrA in Polish obstetric practice. The aim of this study was to translate the Pregnancy-Related Anxiety Questionnaire—Revised 2 (PRAQ-R2) into Polish and to evaluate its reliability and factorial and construct validity. This study was conducted in Poland...

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  • Simple SIR models with Markovian control

    We consider a random dynamical system, where the deterministic dynamics are driven by a finite-state space Markov chain. We provide a comprehensive introduction to the required mathematical apparatus and then turn to a special focus on the susceptible-infected-recovered epidemiological model with random steering. Through simulations we visualize the behaviour of the system and the effect of the high-frequency limit of the driving...

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  • The impact of freeze-thaw processes on a cliff recession rate in the face of temperate zone climate change
    Publication

    - CATENA - Year 2021

    Freeze-thaw action is a common type of geomorphological processes eroding cliff faces in the temperate climate zone. In our previous study, we assessed the geomorphological effects of freeze-thaw fluctuations occurring within the cliff of Jeziorsko Reservoir (central Poland). Based on those findings, we have now determined the number of freeze-thaw cycles to assess their historical impact on the studied cliff. We have also traced...

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  • The influence of atmospheric circulation on the occurrence of dry and wet periods in Central Poland in 1954–2018
    Publication

    - THEORETICAL AND APPLIED CLIMATOLOGY - Year 2021

    This work presents the influence of atmospheric circulation on the occurrence of dry and wet periods in the central Polish region of Kujawy. The material on which the authors relied encompassed monthly totals of precipitation obtained from 10 weather stations in the period 1954–2018. Both dry and wet periods have been identified on the basis of monthly values of the Standardised Precipitation Index (SPI). Additionally, the calendar...

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Year 2020
  • Association of Genes Related to Oxidative Stress with the Extent of Coronary Atherosclerosis
    Publication

    - Life - Year 2020

    Oxidative stress is believed to play a critical role in atherosclerosis initiation and progression. In line with this, in a group of 1099 subjects, we determined eight single nucleotide polymorphisms (SNPs) related to oxidative stress (PON1 c.575A>G, MPO c.463G>A, SOD2 c.47T>C, GCLM c.590C>T, NOS3 c.894G>T, NOS3 c.786T>C, CYBA c.214C>T, and CYBA c.932A>G) and assessed the extent of atherosclerosis in coronary arteries based on...

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Year 2019
  • Folate/homocysteine metabolism and lung cancer risk among smokers
    Publication

    - PLOS ONE - Year 2019

    Background: Folate and homocysteine are involved in DNA synthesis and methylation processes, which are deregulated during carcinogenesis. Objectives: The aim of this study was to assess the relationship between folate/homocysteine concentrations, the functional polymorphisms of folate/homocysteine genes and lung cancer risk among cigarette smokers. Study design: The study included 132 lung cancer patients and 396 controls from...

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Year 2016
  • Changes in gene methylation patterns in neonatal murine hearts: Implications for the regenerative potential
    Publication

    Background The neonatal murine heart is able to regenerate after severe injury; this capacity however, quickly diminishes and it is lost within the first week of life. DNA methylation is an epigenetic mechanism which plays a crucial role in development and gene expression regulation. Under investigation here are the changes in DNA methylation and gene expression patterns which accompany the loss of regenerative potential. Results The...

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  • Markov Model of Disease Development and Recovery
    Publication

    - Year 2016

    Markov models are commonly used to simulate diseases and allow modeling of multiple health states and outcomes. Starting with the well known Le Bras multistate model (cascading failure model) with time-independent transitions we will see how simple Markov mortality models may be pressed into the service of survival and event history analysis. We will focus on more complex models which will be able to take into account remission,...

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Year 2014
  • Critical Case Stochastic Phylogenetic Tree Model via the Laplace Transform
    Publication

    - Demonstratio Mathematica - Year 2014

    Birth–and–death models are now a common mathematical tool to describe branching patterns observed in real–world phylogenetic trees. Liggett and Schinazi (2009) is one such example. The authors propose a simple birth–and–death model that is compatible with phylogenetic trees of both influenza and HIV, depending on the birth rate parameter. An interesting special case of this model is the critical case where the birth rate equals the...

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Year 2010

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