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1

The effect of pretreatment of Tetrahymena pyriformis with colistin on the incorporation of this antibiotic into the cell membrane

100%
Szablewski L.
Acta Protozoologica
|
1988
|
tom 27
|
nr 3-4
2
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Physiological adaptations to osmotic stress and characterization of a polyethylene glycol-responsive gene in Braya humilis

100%
Lirong W., Pengshan Z., Xin Z., Xiaopeng W., Xiaofei M., Yi L.
Acta Societatis Botanicorum Poloniae
|
2016
|
tom 85
|
nr 1
Braya humilis (Brassicaceae) is a widely distributed plant in arid and semi-arid regions of northern Asia. This plant is well adapted to extremely arid conditions and is a promising candidate species to discover novel drought tolerance strategies. However, not much information about the mechanism(s) mediating drought resistance in this species is currently available. Therefore, the present study aimed to characterize the physiological traits and expression patterns of a polyethylene glycol (PEG)-responsive gene in B. humilis responding to different levels of osmotic stress induced by PEG-6000. Several important physiological parameters were examined, including the levels of relative water content, soluble protein, malondialdehyde, and antioxidant enzyme activity. A tolerance threshold between 20 and 30% PEG-6000 was identified for B. humilis. The water status and oxidative damage below this threshold were maintained at a relatively constant level during the 12 h of treatment. However, once the threshold was exceeded, the water status and oxidative damage were obviously affected after treatment for 4 h. The soluble protein results suggest that B. humilis maintains a vigorous resistance to osmotic stress and that it may play a greater role in osmotic regulation at late stages of stress. Moreover, superoxide dismutase and catalase may be important at preventing oxidative damage in plants at early stages of stress, while peroxidase may be more involved in some biological processes that resist osmotic stress at the late stage, especially in severely damaged plants. Furthermore, a PEG-responsive gene, BhCIPK12, was identified by differential display reverse transcription-polymerase chain reaction (PCR), cloned, and characterized by quantitative real-time PCR. We hypothesized that this gene may play an important role in mediating osmotic stress or drought resistance in plants. Altogether, these results provide valuable insights into the mechanism(s) mediating drought tolerance in B. humilis.
3

Physiological adaptation of starved Tetrahymena pyriformis GL to colistin

100%
Szablewski L.
Acta Protozoologica
|
1988
|
tom 27
|
nr 1
4

Recovery of Tetrahymena pyriformis from the effects of colistin. II. A phagocytosis study

84%
Szablewski L.
Acta Protozoologica
|
1989
|
tom 28
|
nr 2
5

Analysis of Velvet Scoter Melanitta fusca heart structures in ecological aspect

67%
Bartyzel B. J., Szmidt M., Barszcz K., Dzierzecka M., Charuta A., Wasowicz M., Kobryn H.
Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine
|
2008
|
tom 11
|
nr 2
6

Response of tomato genotypes to salinity stress assessed at the seedlings stage

67%
Smolik M., Kram P., Krupa-Malkiewicz M., Smolik B., Malinowska K.
Electronic Journal of Polish Agricultural Universities. Series Biology
|
2011
|
tom 14
|
nr 4
7

Refuge microclimates of rodents: a surface nesting Otomys unisulcatus and burrowing Parotomys brantsii

67%
Du P. A., Kerley G. I. H., Winter P. E. D.
Acta Theriologica
|
1992
|
tom 37
|
nr 4
We investigated microclimates of the nest of Otomys unisulcatus Cuvier, 1829 and the warren of Parotomys brantsii (Smith, 1834) during two seasons and correlated these with the rodents' physiology. In both rodents' refuges, temperature varied less than ambient temperature (TA). In winter, temperatures in the O. unisulcatus nest at 40 cm below the nest apex, and in Lhe P. brantsii warren 15 cm below the soil surface, were higher than noclurnal TA. In summer, during the hours of highest TA, refuges wore cooler than TA. Vapour pressure (v.p.) in the refuges varied less and was higher than ambient v.p. In the humid refuges, heat loss by conduction rather than evaporative water loss is suggested. The nest of O. unisulcatus, with less tem­perature variation in winter and lower temperatures in summer, was less dependent ofTA than P. brantsii's warren. The use of these refuges therefore contributes to the survival of those mesic rodents in a semi-arid region.
8

Adaptations of pupae of Chironomidae [Insecta: Diptera] to oxygen-poor habitats

67%
Marziali L., Lencioni V., Rossaro B.
Polish Journal of Ecology
|
2006
|
tom 54
|
nr 4
Morphological, behavioural and physiological adaptations of chironomid pupae to oxygen-poor habitats, such as the profundal zone of lakes, are discussed. Lentic and oxy-regulator species possess developed respiratory organs (thoracic horns) and an extensive anal fringe to perform respiratory movements, whereas in rheophilic and oxy-conformer species these structures are reduced or absent. This led to the hypothesis that the number of thoracic horn branches, the number of anal macrosetae and the body size could consititute a measure of a species’ oxygen requirements. These characters were analyzed in 12 species groups collected in 39 Italian lakes. Numbers were correlated to the optimum value of oxygen level, total phosphorus concentration and transparency calculated for each taxon. Taxa with plumose thoracic horns, extensive anal fringe and large body size (Chironomus) inhabited habitats poorer in oxygen than those inhabited by taxa with less extensive respiratory surface and fringe and small body size (Paratendipes, Polypedilum, Microtendipes). Stictochironomus was less tolerant than expected. Further studies are needed into the physiological adaptations of chironomid pupae.
9

Zmiany aktywności dehydrogenazy kwasu mlekowego i jej izoenzymów w mięśniach szczurów adaptowanych do wysiłku w warunkach intoksykacji cynkiem i ołowiem

51%
Kielan-Bak Z.
Acta Biologica Silesiana
|
1988
|
tom 08
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