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  1. Article: Discriminatory abilities of facultative slave-making ants and their slaves.

    Włodarczyk, T

    Insectes sociaux

    2016  Volume 63, Issue 4, Page(s) 507–517

    Abstract: Intra-colony odor variability can disturb ants' ability to discriminate against intruders. The evolutionary relevance of this phenomenon can be revealed by studies on colonies of slave-making ants in which the parasite, and not the host, is subject to ... ...

    Abstract Intra-colony odor variability can disturb ants' ability to discriminate against intruders. The evolutionary relevance of this phenomenon can be revealed by studies on colonies of slave-making ants in which the parasite, and not the host, is subject to selection pressures associated with living in a mixed colony. We examined how the European facultative slave-making species
    Language English
    Publishing date 2016-06-17
    Publishing country France
    Document type Journal Article
    ZDB-ID 218790-5
    ISSN 1420-9098 ; 0020-1812
    ISSN (online) 1420-9098
    ISSN 0020-1812
    DOI 10.1007/s00040-016-0493-z
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  2. Article: Functional spatial distribution and sociometric characteristics of Formica fusca ants during winter dormancy

    Włodarczyk, Tomasz

    Ecological entomology. 2021 Apr., v. 46, no. 2

    2021  

    Abstract: 1. Ant colonies passing through the period of winter dormancy are subject to the two conflicting selective pressures: (i) on escaping the coldest temperatures during the winter by hiding deep into the soil and (ii) on the reactivation after overwintering ...

    Abstract 1. Ant colonies passing through the period of winter dormancy are subject to the two conflicting selective pressures: (i) on escaping the coldest temperatures during the winter by hiding deep into the soil and (ii) on the reactivation after overwintering as soon as the weather conditions become favourable and the soil surface is warm enough. 2. If selective pressures associated with overwintering are affected differently by the spatial variation in the climate conditions then different overwintering strategies can be expected to occur across geographical gradients. 3. In this study, Formica fusca colonies were excavated in north‐eastern Poland to examine the spatial distribution of overwintering ants. It has been found that queens, accompanied by part of the workers, shelter themselves at a depth close to the colony's lower limit. However, workers were clustered at different depths along the soil profile, including a few centimetres from the soil surface. 4. Natural selection might promote to allocate individuals who are less valuable to the colony to more risky tasks (e.g. those performed outside the nest). Thus, playing the role of a forager should be associated with the occupation of more risky positions during overwintering. However, no statistically significant difference has been found between workers overwintering in the upper and lower soil strata in their propensity to explore the experimental arena. 5. The observed pattern of the spatial distribution of overwintering ants indicates the existence of a trade‐off between winter mortality, costs of physiological adaptations, and the time needed for a colony to reactivate in response to temperature increase.
    Keywords Formica fusca ; dormancy ; entomology ; mortality ; natural selection ; nests ; occupations ; overwintering ; soil profiles ; temperature ; weather ; winter ; Poland
    Language English
    Dates of publication 2021-04
    Size p. 419-427.
    Publishing place Blackwell Publishing Ltd
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 196048-9
    ISSN 0307-6946
    ISSN 0307-6946
    DOI 10.1111/een.12983
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  3. Article ; Online: Whole-body cryostimulation (cryotherapy) provides benefits for fatigue and functional status in multiple sclerosis patients. A case-control study.

    Miller, E / Kostka, J / Włodarczyk, T / Dugué, B

    Acta neurologica Scandinavica

    2016  Volume 134, Issue 6, Page(s) 420–426

    Abstract: Objectives: To study the effects of whole-body cryostimulation (WBC) on fatigue and functional status in multiple sclerosis (MS) patients with different levels of fatigue.: Subjects and methods: Two groups of 24 MS patients with fatigue were studied. ...

    Abstract Objectives: To study the effects of whole-body cryostimulation (WBC) on fatigue and functional status in multiple sclerosis (MS) patients with different levels of fatigue.
    Subjects and methods: Two groups of 24 MS patients with fatigue were studied. At the beginning of the study, the first group presented a Fatigue Severity Scale (FSS) score between 38 and 42 (low-fatigue (LF) group), and the second group had an FSS score between 48 and 52 (high-fatigue (HF) group). Both groups were matched for age and sex. All patients were exposed to 10.3-min session of WBC (one exposure per day at -110°C or lower). Functional status was assessed before and after the series of WBC exposures using the Rivermead Motor Assessment (RMA), the Multiple Sclerosis Impact Scale (MSIS-29), and the Expanded Disability Status Scale (EDSS). The RMA was estimated in three sections: gross function (RMA1), leg and trunk (RMA2), and arm (RMA3). MSIS-29 consists of two subscales assessing the physical (MSIS-29-PHYS) and psychological (MSIS-29-PSYCH) status.
    Results: In both groups, the WBC sessions induced a significant improvement in the functional status and in the feeling of fatigue. However, the changes observed in HF patients were significantly greater than those observed in LF patients, especially in the MSIS-29-PHYS, MSIS-29-PSYCH, RMA1, and RMA3. The changes observed in the EDSS, RMA2, and FSS were similar in both groups.
    Conclusions: WBC appears to be effective in improving functional status and the feeling of fatigue in patients with MS and especially in those who are the most fatigued.
    MeSH term(s) Arm/physiopathology ; Case-Control Studies ; Cryotherapy/methods ; Disability Evaluation ; Disease Progression ; Fatigue/etiology ; Fatigue/therapy ; Female ; Humans ; Leg/physiopathology ; Male ; Middle Aged ; Multiple Sclerosis/complications ; Multiple Sclerosis/rehabilitation ; Thorax ; Treatment Outcome
    Language English
    Publishing date 2016-12
    Publishing country Denmark
    Document type Journal Article
    ZDB-ID 90-5
    ISSN 1600-0404 ; 0001-6314
    ISSN (online) 1600-0404
    ISSN 0001-6314
    DOI 10.1111/ane.12557
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  4. Article ; Online: Facultative slave-making ants Formica sanguinea label their slaves with own recognition cues instead of employing the strategy of chemical mimicry.

    Włodarczyk, Tomasz / Szczepaniak, Lech

    Journal of insect physiology

    2017  Volume 96, Page(s) 98–107

    Abstract: Slave-making ant species use the host workforce to ensure normal colony functioning. Slaves are robbed as pupae from their natal nest and after eclosion, assume the parasite colony as their own. A possible factor promoting the successful integration of ... ...

    Abstract Slave-making ant species use the host workforce to ensure normal colony functioning. Slaves are robbed as pupae from their natal nest and after eclosion, assume the parasite colony as their own. A possible factor promoting the successful integration of slaves into a foreign colony is congruence with the slave-makers in terms of cuticular hydrocarbons, which are known to play the role of recognition cues in social insects. Such an adaptation is observed in the obligate slave-making ant species, which are chemically adjusted to their slaves. To date, however, no reports have been available on facultative slave-making species, which represent an earlier stage of the evolution of slavery. Such an example is Formica sanguinea, which exploit F. fusca colonies as their main source of a slave workforce. Our results show that F. sanguinea ants have a distinct cuticular hydrocarbon profile, which contains compounds not present in free-living F. fusca ants from potential target nests. Moreover, enslaved F. fusca ants acquire hydrocarbons from their slave-making nestmates to such an extent that they become chemically differentiated from free-living, conspecific ants. Our study shows that F. sanguinea ants promote their own recognition cues in their slaves, rather than employing the strategy of chemical mimicry. Possible reasons why F. sanguinea is not chemically well adjusted to its main host species are discussed in this paper.
    MeSH term(s) Animals ; Ants/physiology ; Behavior, Animal ; Cues ; Hydrocarbons/metabolism ; Odorants/analysis ; Social Behavior
    Chemical Substances Hydrocarbons
    Language English
    Publishing date 2017-01
    Publishing country England
    Document type Journal Article
    ISSN 1879-1611
    ISSN (online) 1879-1611
    DOI 10.1016/j.jinsphys.2016.10.016
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  5. Article: Recognition of Individuals from Mixed Colony by Formica sanguinea and Formica polyctena Ants

    Włodarczyk, Tomasz

    Journal of insect behavior. 2012 Mar., v. 25, no. 2

    2012  

    Abstract: It was examined whether Formica polyctena and F. sanguinea ants from a mixed colony elicit higher levels of aggression of conspecific ants in comparison to ants from homospecific colonies. Individuals were confronted in an experimental arena and their ... ...

    Abstract It was examined whether Formica polyctena and F. sanguinea ants from a mixed colony elicit higher levels of aggression of conspecific ants in comparison to ants from homospecific colonies. Individuals were confronted in an experimental arena and their behavior was recorded. It was found that F. polyctena workers behaved more aggressively toward ants from a mixed colony. This pattern, however, was not confirmed in F. sanguinea. Moreover, both species clearly discriminated between conspecific and allospecific ants from a mixed colony. It seems that as a result of social interactions both species exchanged cuticular hydrocarbons, which caused their recognition labels to adjust to some extent. Results of the present study support the idea that that F. sanguinea is able to form mixed colonies in which species-specific recognition cues are probably still retained.
    Keywords Formica polyctena ; aggression ; hydrocarbons
    Language English
    Dates of publication 2012-03
    Size p. 105-113.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 2016965-6
    ISSN 1572-8889 ; 0892-7553
    ISSN (online) 1572-8889
    ISSN 0892-7553
    DOI 10.1007/s10905-011-9280-x
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  6. Article: N<sub>2</sub>O emission from mineral soils – Reviews

    Włodarczyk, T. / Gliński, J. / Kotowska, U.

    Research in Agricultural Engineering. , v. 50, no. 3

    2012  

    Abstract: Increasing deposition of N-compounds cause environmental problems such as leaching of nitrate or enhanced emission of N ... 2 ... O. Most N ... 2 ... O is formed from dissimilatory reduction of nitrate in oxygen deficient environment, although it can ... ...

    Abstract Increasing deposition of N-compounds cause environmental problems such as leaching of nitrate or enhanced emission of N<sub>2</sub>O. Most N<sub>2</sub>O is formed from dissimilatory reduction of nitrate in oxygen deficient environment, although it can also be produced from chemolitotrophic and heterotrophic nitrification and assimilatory reduction of nitrate in aerobic conditions. N<sub>2</sub>O production is affected by many physical and biochemical factors, such as: the nature and amount of organic matter available as energy sources to the denitrifiers and heterotrophic nitrifiers, the aeration/moisture status of the soil, the soil nitrate concentration, soil pH, and the soil texture. These factors interact in a complicated manner with microorganisms on a microscale level in the soil, creating the large spatial and temporal variability in denitrification and and influenced on N<sub>2</sub>O/N ratio. The N<sub>2</sub>O emission increased linearly with NO<sub>3</sub><sup>–</sup> reduction and curvilinearly with organic matter content, dehydrogenase activity and pH value and decreased curvilinearly with oxygen content.
    Keywords aeration ; denitrification ; denitrifying microorganisms ; energy ; nitrates ; nitrification ; nitrous oxide production ; organic matter ; oxidoreductases ; oxygen ; research ; soil pH ; soil texture ; temporal variation
    Language English
    Dates of publication 2012-0208
    Size p. 117-122.
    Publishing place Czech Academy of Agricultural Sciences
    Document type Article
    ZDB-ID 2012829-0
    ISSN 1212-9151
    ISSN 1212-9151
    DOI 10.17221/4937-rae
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    Z 6864: Show issues

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  7. Article ; Online: Incomplete homogenization of chemical recognition labels between Formica sanguinea and Formica rufa ants (Hymenoptera: Formicidae) living in a mixed colony.

    Włodarczyk, Tomasz / Szczepaniak, Lech

    Journal of insect science (Online)

    2014  Volume 14

    Abstract: Formica sanguinea Latreille (Hymenoptera: Formicidae) is a slave-making species, i.e., it raids colonies of host species and pillages pupae, which are taken to develop into adult workers in a parasite colony. However, it has been unclear if the ... ...

    Abstract Formica sanguinea Latreille (Hymenoptera: Formicidae) is a slave-making species, i.e., it raids colonies of host species and pillages pupae, which are taken to develop into adult workers in a parasite colony. However, it has been unclear if the coexistence of F. sanguinea with slave workers requires uniformity of cuticular hydrocarbons (CHCs), among which those other than n-alkanes are believed to be the principal nestmate recognition cues utilized by ants. In this study, a mixed colony (MC) of F. sanguinea and Formica rufa L. as a slave species was used to test the hypothesis that CHCs are exchanged between the species. Chemical analysis of hexane extracts from ants' body surfaces provided evidence for interspecific exchange of alkenes and methyl-branched alkanes. This result was confirmed by behavioral tests during which ants exhibited hostility toward conspecific individuals from the MC but not toward ones from homospecific colonies of their own species. However, it seems that species-specific differences in chemical recognition labels were not eliminated completely because ants from the MC were treated differently depending on whether they were con- or allospecific to the individuals whose behavioral reactions were tested. These findings are discussed in the context of mechanisms of colony's odor formation and effective integration of slaves into parasite colony.
    MeSH term(s) Aggression ; Animal Communication ; Animals ; Ants/physiology ; Behavior, Animal ; Cues ; Hydrocarbons/analysis ; Odorants ; Species Specificity
    Chemical Substances Hydrocarbons
    Language English
    Publishing date 2014
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2049098-7
    ISSN 1536-2442 ; 1536-2442
    ISSN (online) 1536-2442
    ISSN 1536-2442
    DOI 10.1093/jisesa/ieu076
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  8. Article: Effect of silicon on barley growth and N2O emission under flooding

    Włodarczyk, Teresa / Balakhnina, Tamara / Brzezińska, Małgorzata / Fomina, Irina / Matichenkov, Vladimir / Nosalewicz, Magdalena / Szarlip, Paweł

    Science of the total environment. 2019 Oct. 01, v. 685

    2019  

    Abstract: The global climate change is related with greenhouse gas emission from cultivated soils – carbon dioxide, methane and nitrous oxide. The emissions of N2O also have negative influence on ozone layer of our planet. The major source of the nitrous oxide is ... ...

    Abstract The global climate change is related with greenhouse gas emission from cultivated soils – carbon dioxide, methane and nitrous oxide. The emissions of N2O also have negative influence on ozone layer of our planet. The major source of the nitrous oxide is denitrification process in soil, which controlled by specific soil microbe society. The pot experiment with flooding to accelerate the denitrification process and the application of the monosilicic acid as a source of soluble form of Si was carried out with barley. Several forms of nitrous oxide emission (unlimited carbon denitrification and potential denitrification with or without ethylene application) were measured. The obtained data showed that the application of monosilicic acid to brown soil when growing barley under conditions of soil flooding has a significant effect on nitrogen emission and can change the N2O:N2 ratio. The application of the monosilicic acid reduced the uC-D N2O emission, while increased the PD N emission. Generally the application of the water soluble Si decreased the N2O:N2 ratio. We suggested that the presence of monosilicic acid in the system provides a more complete denitrification process with the formation of N2 in the NO3− → NO2− → NO→N2O → N2 reaction sequence, while the deficiency of bioactive Si mainly provides the formation and emission of N2O. Considering that N2 is not a greenhouse gas, we can conclude that application of monosilicic acid to the soil can reduce greenhouse gas emissions and reduce the impact of global climate change on agricultural activity.
    Keywords barley ; carbon ; carbon dioxide ; climate change ; denitrification ; ethylene ; greenhouse gas emissions ; greenhouse gases ; methane ; nitrates ; nitrites ; nitrogen ; nitrous oxide ; nitrous oxide production ; ozonosphere ; silicon ; soil ; soil microorganisms ; water solubility
    Language English
    Dates of publication 2019-1001
    Size p. 1-9.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2019.05.410
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    Zs.A 949: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (1.OG)
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  9. Article: Wpływ wypowiedzi i komentarzy członków rady polityki pienie̜żnej na krzywa̜ dochodowości: badanie półsilnej efektywności informacyjnej rynku kontraktów FRA i swapów procentowych

    Włodarczyk, Tomasz

    Bank i kredyt Vol. 39, No. 2 , p. 43-59

    2008  Volume 39, Issue 2, Page(s) 43–59

    Title variant The influence of Polish Monetary Policy Council members' verbal comments on the yield curve: the analysis of the semi-strong form informational efficiency of FRA and IRS markets
    Author's details Tomasz Włodarczyk
    Keywords Zinspolitik ; Zentralbank ; Informationseffizienz ; Zinsderivat ; Polen
    Language Polish
    Size graph. Darst.
    Publishing place Warszawa
    Document type Article
    Note Zsfassung in engl. Sprache
    ZDB-ID 2374691-9
    Database ECONomics Information System

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  10. Article ; Online: Th17-Related Cytokines as Potential Discriminatory Markers between Neuromyelitis Optica (Devic's Disease) and Multiple Sclerosis-A Review.

    Maciak, Karina / Pietrasik, Sylwia / Dziedzic, Angela / Redlicka, Justyna / Saluk-Bijak, Joanna / Bijak, Michał / Włodarczyk, Tomasz / Miller, Elzbieta

    International journal of molecular sciences

    2021  Volume 22, Issue 16

    Abstract: Multiple sclerosis (MS) and Devic's disease (NMO; neuromyelitis optica) are autoimmune, inflammatory diseases of the central nervous system (CNS), the etiology of which remains unclear. It is a serious limitation in the treatment of these diseases. The ... ...

    Abstract Multiple sclerosis (MS) and Devic's disease (NMO; neuromyelitis optica) are autoimmune, inflammatory diseases of the central nervous system (CNS), the etiology of which remains unclear. It is a serious limitation in the treatment of these diseases. The resemblance of the clinical pictures of these two conditions generates a partial possibility of introducing similar treatment, but on the other hand, a high risk of misdiagnosis. Therefore, a better understanding and comparative characterization of the immunopathogenic mechanisms of each of these diseases are essential to improve their discriminatory diagnosis and more effective treatment. In this review, special attention is given to Th17 cells and Th17-related cytokines in the context of their potential usefulness as discriminatory markers for MS and NMO. The discussed results emphasize the role of Th17 immune response in both MS and NMO pathogenesis, which, however, cannot be considered without taking into account the broader perspective of immune response mechanisms.
    MeSH term(s) Adaptive Immunity/immunology ; Autoimmune Diseases/diagnosis ; Autoimmune Diseases/immunology ; Biomarkers ; Cytokines/immunology ; Cytokines/metabolism ; Diagnosis, Differential ; Humans ; Multiple Sclerosis/diagnosis ; Multiple Sclerosis/immunology ; Neuromyelitis Optica/diagnosis ; Neuromyelitis Optica/immunology ; Th17 Cells/immunology ; Th17 Cells/physiology
    Chemical Substances Biomarkers ; Cytokines
    Language English
    Publishing date 2021-08-20
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms22168946
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