The Influence of Temperature on C153 Steady-State Absorption and Fluorescence Kinetics in Hydrogen Bonding Solvents

In a recent paper (J Fluoresc (2011) 21:1547–1557) a temperature induced modulation of Coumarin 153 (C153) fluorescence lifetime and quantum yield for the probe dissolved in the polar, nonspecifically interacting 1-chloropropane was reported. This modulation was also observed in temperature dependencies of the radiative and nonradiative rates. Here, we show that the modulation is also observed in another 1-chloroalkane—1-chlorohexane, as well as in hydrogen bonding propionitrile, ethanol and trifluoroethanol. Change in the equilibrium distance between S(0) an S(1) potential energies surfaces was identified as the source of this modulation. This change is driven by temperature changes. It leads to a modulation of the fluorescence transition dipole moment and it is the primary source of the experimental effects observed. Additionally, we have found that proticity of the solvent induces a rise in the fluorescence transition dipole moment, which leads to a shortening of the fluorescence lifetime. Hydrogen bonds are formed by C153 also with hydrogen accepting solvents like propionitrile. We show that while such bonds do not affect the transition probability, they do change the S(0) an S(1) energy gap which in turn implies a change in non-radiative transition rate in a similar way as in protic solvents, as well as in the fluorescence spectrum position. Finally, the influence of temperature on the energies of hydrogen bonds formed by C153 when acting as hydrogen donor or acceptor is reported

The influence of atmospheric circulation on bioclimatic conditions in Lublin (Poland)

This study provides evaluation of the relationship between atmospheric circulation conditions and the frequency of heat/cold stress incidence in Lublin in the years 1951-2010 according to the Universal Thermal Climate Index (UTCI). The paper outlines the frequency and conditional probability of heat/cold stress occurrence during particular circulation types and the analysis of the circulation patterns that induce these incidents. The increased wind velocity had a significant effect on forming unfavorable bioclimatic conditions in the winter. Whereas, in summer, heat stress was observed nearly exclusively when high pressure system from the eastern part of Europe induces a slow inflow of very warm air masses from the eastern or southern directions

SOME REMARKS ON THE HIGHEST WIND SPEED VALUES IN LUBLIN

This paper presents and analysis of the highest wind speed values recorded at the Meteorological Observatory of the Maria Curie-Skłodowska University in Lublin. The study uses values recorded data (3 times a day) for the period 1981–2005. During the 25 years of the study period there were 19 occasions of wind speed ≥ 10 m·s-1 and 14 cases of winds gusting at or over 20 m·s-1. Both kinds of situation were noticed most often in January and did not occur in May, June, July or August.

Use of entropy in the analysis of nominal traits in sheep

In the analysis of dependencies between nominal traits entropy and its function, mutual information seems to be a proper descriptive statistic. This is shown by characterizing the relationships between the prolificacy of dams and selected genetic attributes: the genotype of transferrin, the genotype of hemoglobin, and the type of birth, as well as the environmental attribute, i.e., year of birth. The entropy method may improve the exactitude of investigations concerning the influence of different factors on production trait. The index of relative uniformity, introduced in this study, proved to be an adequate tool for the determination of similarity in the examined flocks. The application of mutual information in the determination of values of the dependence measures in the analyzed experiment was justified

Venous malformations in children - a literature review

Introduction: Venous malformations are congenital, the most occurring subtype of vascular malformations. They are characterized by slow flow, tortuosity and lack of macular layer within the vessel. Venous malformations can be highly problematic to diagnose and treat, thus differentiation the venous malformations with other diseases in pediatric population is important.   Aim of the study: The aim of the study is to summarize the available knowledge about venous malformation in pediatric population. The options in diagnosis, treatment and potential new methods were summarized and described. Materials and methods The literature available in the PubMed database was reviewed using the following keywords: “Vascular malformations”, “Venous Malformations”, “Venous malformations treatment, “Children”. Conclusions: Venous malformations are an important problem in pediatric population, as a seldom affliction they can be easily misdiagnosed as other diseases and treated inadequately. Widening of awareness of venous malformations and possible methods of diagnosing and treating them is very important to raise quality of health care in children

IQOS - new heat-not-burn tobacco products and its impact on health

Introduction: Iqos and other heat-not-burn products according to tobacco companies are a safer alternative to cigarettes. The aim of this article is to objectively review the potential impact of iQOS® on human health by searching for and integrating published research findings. This article provides a comprehensive review and analysis of the scientific research conducted on the effects of Iqos use on human health, distinguishing between specific medical fields. Materials and methods: This study is based on medical articles collected from the PubMed database spanning the years 2016-2023. The research was conducted through the analysis of keywords such as "Iqos", "Heat not burn", and "Iqos health impact".  Results: Tobacco heaters are seen as potentially less harmful. However, emerging research on their harmfulness clearly shows that despite reduced concentrations of compounds hazardous to health, the aerosol produced by heaters still contains the same harmful substances. Further studies show that the toxic impact of the aerosol is at a similar level to that of smoke from traditional cigarettes

New technologies in the surgical treatment of wounds

Introduction: Many wounds are treated surgically. For many years the method itself consisted mainly in cleaning the wounds and bringing its edges closer together, either by  strips for closing the wounds or by suturing the wound with classic sutures or staples. Recently, new methods have emerged to support wound healing, which are discussed in this article. Materials and methods: The basis of the work were medical articles collected in the PubMed database. The research was conducted by analyzing key words such as: "surgical treatment of wounds", "new technologies in wounds", "wound healing and new technologies", "dressings in wound treatment", "new methods of accelerating wound healing". Results: In the process of surgical wound treatment the basis is still the closure and connection of the edges of the wounds, which prevents infections, accelerates healing and improves the cosmetic effect. However this is not the final stage of wound healing. Equally important is the subsequent appropriate selection of the dressing - appropriate in terms of its composition of active substances and absorption properties. The choice of the right dressing has a large impact on the final effect and the avoidance of infections or the subsequent appearance of the scar. Now we also have many new technologies to help heal wounds. They help not only to reduce the risk of infection, but also accelerate the healing process and shorten the treatment time

Do emotions organize or disorganize action?

INTRODUCTION  Emotions companions us in our everyday life and are still difficult to define. Among many functions, such as inducing physiological changes, availability to specific behaviors, the organizing or disorganizing influence of emotions is also distinguished.  OBJECTIVE  The aim of the article is to show the theory of emotions and answer the question whether they organize our actions or, on the contrary, promote disorganization.  STATE OF THE ART. DESCRIPTION  Among the many functions attributed to emotions are that they can direct our actions towards a given goal and sustain it, or vice versa. Emotion is, among other things, an expression of the action of instincts, it mobilizes the body, organizes action and performs an energizing function. Nowadays, attention is paid to the mobilizing aspects of emotions - weak or moderate emotions organize our functioning. Only a strong emotional state ceases to motivate, makes our actions disoriented. On the other hand, it is necessary to distinguish between emotional states and motivation. Watson shows emotions as a disorder of homeostasis along with numerous disorders of mental regulation. Clore, Clark, and Watson argue that dysfunctional are persistent, troublesome states that may be manifestations of affective or temperamental disorders rather than transient emotions. Speaking of emotion and its impact on action, it is worth mentioning and stopping at the issue of inhibition and expressing emotional states.    CONCLUSION  It is not possible to unequivocally determine that emotions either organize or disorganize our behavior, because a lot depends on the intensity of the experienced emotion and its directio

The Influence of Temperature on Coumarin 153 Fluorescence Kinetics

The influence of temperature varied in the range 183 K–323 K on the fluorescence quantum yield, fluorescence lifetime, absorption and emission transition moments and non-radiative deactivation rate was determined for the well known and largely used dye Coumarin 153, dissolved in 1-chloropropane. The Kennard-Stepanov relation connecting the absorption and emission spectra was used to check for the presence of more than one absorbing/emitting species and to investigate whether intramolecular vibrational redistribution completes in the C153 excited S1 state before the emission takes place. The emission spectrum corresponding to S1→S0 transition, was fitted at each temperature to the model function including the information on the dye vibrational modes coupling. In this way the displacement in equilibrium distance for the most active vibrational mode was determined for C153 in S1 and in S0. Using the temperature dependence of the fluorescence decay time and quantum yield, the non-radiative deactivation rate was determined. Its temperature dependence was compared to that calculated using the theoretical model with the most active vibrational mode displacement values taken from steady-state spectra analysis. The somewhat surprising dependence of the fluorescence decay time and quantum yield on temperature was related to non-trivial coupling between low-frequency vibrational modes of C153 in the excited and ground states