Eugenia Tegowska

Eugenia Tegowska
Nicolaus Copernicus University | umk · Animal Physiology/ Animal Toxicology

About

69
Publications
3,841
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299
Citations
Citations since 2016
5 Research Items
147 Citations
20162017201820192020202120220510152025
20162017201820192020202120220510152025
20162017201820192020202120220510152025
20162017201820192020202120220510152025

Publications

Publications (69)
Article
Pesticide formulations contain solvents and compounds that improve dispersion and absorption. One of the solvents employed in pesticide concentrates is xylene, an aromatic hydrocarbon widely used in paints, lacquers, or glues. This study was undertaken to evaluate the possible toxic effect of xylene on the giant cave cockroach Blaberus giganteus L....
Article
The effectiveness of insecticides differs with changes in temperature, but insecticide toxicities are determined at constant temperatures. Constant thermal conditions do not occur in the field, where insects can change their behaviors to achieve a preferred temperature. The aim of this study was to assess whether the choice of ambient temperature a...
Article
Full-text available
Pesticides are known to affect insects metabolic rate and CO2 release patterns. In the presented paper metabolic rate and mortality of mealworms Tenebrio molitor L. exposed to four different insecticides was evaluated, to find out whether there is a relationship between mealworms sensitivity to pesticides and their metabolic rate. Tenebrio molitor...
Article
Capsazepine is a competitive antagonist of capsaicin, a TRPV1 agonist responsible for the spicy taste of pepper. TRPV1 agonists and antagonists are known to affect mammalian body temperature, but their action on thermoregulation in insects is poorly known. In this study we evaluated the effect of capsazepine on the thermal preference of the America...
Article
A comparison of the ratio of morningness/eveningness among students in the years 2005 and again 2011 in Poland revealed an increase in the number of people preferring evening activity (from 15.5% to 27.5%) and a decrease of morning type individuals. The only factor which undergone a change during this time is the number of personal computers with i...
Article
The aim of the presented study was to assess the applicability of capsaicin as a synergist for organophosphate insecticide against the Colorado potato beetle (Leptinotarsa decemlineata Say). We recorded the death rate, behavioral thermoregulation and meta-bolic rate of the examined insects after intoxication with capsaicin and organophosphate pesti...
Article
Transient receptor potential channels are implicated in thermosensation both in mammals and insects. The aim of our study was to assess the effect of mammalian vanilloid receptor subtype 1 (TRPV1) agonist (capsaicin) and antagonist (capsazepine) on insect behavioral thermoregulation. We tested behavioral thermoregulation of mealworms larvae intoxic...
Article
The paper contrasts the historical view on causal factors in Alzheimer's disease (AD) with the modern concept of the symptoms' origin. Biological sciences dealing with cell structure and physiology enabled comprehension of the role of mitochondrial defects in the processes of formation of neurofibrillary tangles and β-amyloid, which in turn gives h...
Article
The paper contrasts the historical view on causal factors in Alzheimer’s disease (AD) with the modern concept of the symptoms’ origin. Biological sciences dealing with cell structure and physiology enabled comprehension of the role of mitochondrial defects in the processes of formation of neurofibrillary tangles and β-amyloid, which in turn gives h...
Article
A new method is presented for the determination of five selected beta-receptor antagonists by HPLC, which emphasizes sample preparation via retention on a new type of silica gel sorbent used for solid-phase extraction (SPE). Sorbents of this type were obtained by the chemical modification of silica gels of various porosities by cholesterol ligands....
Article
Full-text available
We tested whether food availability, thermal environment and time of year affect torpor use and temperature selection in the large mouse-eared bat (Myotis myotis) in summer and winter. Food-deprived bats were torpid longer than bats offered food ad libitum. Bats placed in a gradient of low (0 degrees C-25 degrees C) ambient temperatures (T(a)) spen...
Article
Introduction. In 1939 Kleitman showed that people, who because of their time of sleep and wake are referred to as 'larks' (morning type of activity) or 'owls' (evening type), are characterised by different time of body temperature peak, and moreover, by different time of highest physical and mental activity. 60 years later Natale V., Cicogna P. pro...
Article
Introduction. For about 70 years it has been known, there are relations between circadian activity pattern and season of birth. However, the data from different studies were inconsistent. One of the reasons of this inconsistency may be analyzing data from heterogeneous groups, while there are differences in the pineal sensitivity for light between...
Article
We studied the influence of light-dark (L:D) cycle reversal on daily variations in the brown adipose tissue (BAT) capacity for nonshivering thermogenesis (NST) in Siberian hamsters (Phodopus sungorus). Continuous and simultaneous measurements of BAT temperature (T(BAT)) and preferred ambient temperature (PT(a)) were made after noradrenaline (NA) in...
Article
We investigated the effect of prolonged acclimation to 12 hr of light and photo-schedule reversal during the time of photosensitivity in golden hamsters (Mesocricetus auratus). Before the experiments, animals were housed under natural photoperiod and then transferred to 12L:12D (light 12 hr:dark 12 hr) in autumn for 12 weeks. After 4 weeks of accli...
Article
Differences in blood buffering capacity and in blood glucose level homeostasis were examined in hibernators (golden hamsters) and non-hibernators (house mice) acclimated to a cold environment and short photoperiod. First, the pH and glucose levels were investigated in experimental animals maintained at a temperature of 22°C and a 12:12 light-dark c...
Article
This study examines the effects of two pesticides on bioelectrical activity and thermal behavior in adult cockroaches Periplaneta americana L. We tested the pyrethroid insecticide β-cyflutrin and one of the new class of oxadiazine insecticides, indoxacarb. The results indicate that β-cyflutrin and indoxacarb differently affect the insect's excitabl...
Article
Proper adjustments of the thermoregulatory mechanisms ensure survival in the natural environment. In the present study, we tested the hypothesis that laboratory golden hamsters (Mesocricetus auratus) housed under seminatural outdoor conditions are able to acclimatize to daily and seasonal changes in the environment despite their long history of bre...
Article
Nonshivering thermogenesis (NST) is a main source of heat for many small mammals. It undergoes seasonal changes, being the highest in winter and the lowest in summer. Such acclimatization can ensure winter survival for species living in moderate or cold climates. Nevertheless, not only seasonal, but also daily changes in the capacity for NST seem t...
Article
Full-text available
Application of insecticides is heaviest in spring when breeding and crucial stages of larval development occur. In our laboratory investigations tadpoles exposed to acetamprid exhibited reduced survival and this effect showed dramatic differences at different stages (6 and 20) of metamorphosis of tadpoles. Small doses showed effect of hormese, high...
Article
Daily variations in sensitivity to noradrenaline (NA) and the activation of nonshivering thermogenesis (NST) are important for survival under a potentially wide range of environmental conditions. However, little is known regarding the ability of the Siberian hamster and other species to activate NST in the day and night when they may be subjected t...
Article
Natural neurotoxins are promising molecules in the actual search for the development of alternative pest management since chemical insecticides pose unacceptable risks to the environment and to health. The aim of the article is to describe the application of two electrophysiological methods (double-oil-gap technique used on cockroach isolated giant...
Article
In adult mammals fever is associated with the reduction of blood plasma iron level. Immature mammals, however, show either a decrease (precocial animals such as guinea pig neonates) or a lack of reduction (altricial animals such as human neonates) of plasma iron in response to endotoxin. In order to determine whether this difference is connected wi...
Article
The effects of ambient temperatures of 10 degrees C and 30 degrees C and of E. coli endotoxin on brain temperature and plasma iron level were investigated in unrestrained wild house mice, Mus musculus. In control animals (i.p. saline-injected) exposed to cold environment the brain temperature decreased and plasma iron levels were lower than those o...
Article
Iron, apart a for long time well-known function connected with: transportation (hemoglobin), storage (myoglobin), and utilize (cytochromes, cytochrome oxidase) oxygen for respiration, has a critical role in host-pathogen interactions. Iron is essential for microbial growth, but also for immune function. The role of iron in infection, thermoregulati...
Article
At ambient temperatures 10 degrees C, 20 degrees C, 30 degrees C, and 40 degrees C the influence of heat dissipation on the thermoregulatory mechanisms in rabbits with fever was investigated. Temperature of the brain (TBr-accuracy +/- 0.05 degree C) temperature of the nasal mucosa (TN) and temperature of the ear pinna (TAU-accuracy +/- 0.5 degree C...
Article
In 9 rabbits the effect of intravenous administration of E. coli pyrogen 0.5 microgram/kg on the reaction of selective brain cooling was studied at ambient temperatures of 20, 30 and 40 degrees C. In the freely moving animals the temperatures of the brain, carotid artery and nuchal muscles were measured with an accuracy down to 0.05 degree C and th...
Chapter
This chapter discusses the functional efficacy of the brown adipose tissue (BAT) in cold and after noradrenaline injection dependence on the size of the animal and on integumental isolation value. Spectacular experiments performed a few years ago on big animals exposed to thermal stress showed intensive protection of the brain against hyperthermia....
Article
Reversible brain hyperthermia during audiogenic seizures in rats. Acta Physiol. Pol., 1979, 30 (2): 273--277. Nine rats having inborn audiogenic susceptibility had chronically implanted Cu-constantan thermocouple and epidural EEG electrodes sewed into the skull. In freely moving animals audiogenic seizures were provoked by the use of common electri...
Article
U chomika zlocistego (Mesocricetus auratus Waterhouse, 1839) zmierzono tempo zuzycia tlenu, temperature ciala i ruchy oddechowe w zakresie temperatury środowiska od 15 do 40oC. Obserwowano takze rozne formy behawioru związane z przeciwstawianiem sie termicznemu dzialaniu otoczenia.

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