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Wyświetlanie 1-15 z 22
Tytuł:
Impact of copper substrate on survival, mobility and attachment strength of adult Dreissena polymorpha (Pall.)
Autorzy:
Kobak, J.
Klosowska-Mikulan, E.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/83923.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Zebra mussels were tested for their mobility and strength of attachment in six diferent experimental combinations. They were kept for 7 days on copper or plastic (phenoplast) plates in 4-L beakers put on the bottom, or on plastic (resocart) plates suspended 15 mm above copper ones; water used was pure or with addition of a metal ion chelator - disodium versenate (EDTA). Exposure to copper ions resulted in the highest mortality. When the ions were EDTA-removed, the animals tended to leave copper plates and stay on the glass bottom or walls of the beakers. Attachment strength was measured with a device based on pan scales, with one of the pans replaced by forceps grasping a mussel. It was significantly lower in the presence of copper ions or with metallic substrate. Both the release of ions and the surface properties of copper substrate were found to influence zebra mussels, the former factor increasing their mortality, the latter causing sublethal responses. The observations may be useful in designing fouling-resistant devices and systems.
Źródło:
Folia Malacologica; 2002, 10, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of light conditions on geotaxis behaviour of juvenile Dreissena polymorpha
Autorzy:
Kobak, J.
Powiązania:
https://bibliotekanauki.pl/articles/83081.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Zebra mussel (Dreissena polymorpha) strongly affects aquatic ecosystems and underwater hydrotechnical equipment. In this study, movement direction of juvenile mussels (< 10 mm) was studied on a glass plate inclined against an aquarium wall (at angle of 16.5° to the bottom), or on the flat bottom, in various light conditions. In the darkness, the mussels exhibited a negative geotaxis, while in uniform light the numbers of specimens moving up and down the plate were similar. On the flat bottom, the mussels displayed a negative phototaxis. When only the upper part of the inclined plate was illuminated, most of the individuals moved downwards, indicating that light was a stronger signal than gravity. On the inclined plate with its lower part illuminated, more mussels moved upwards (like in the darkness), but this tendency was not statistically significant. Due to the observed behaviour, mussels could counteract adverse effects of conspecific competition by selecting sites on the top of a colony (due to the negative geotaxis in the darkness), and avoid dangers associated with water surface, such as increased probability of air exposure or predator attacks (due to the negative phototaxis in the light).
Źródło:
Folia Malacologica; 2002, 10, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of effect of copper substratum on the adhesion, intensity of migration and mortality of the zebra mussels (Dreissena polymarpha (Pallas, 1771))
Autorzy:
Kobak, J.
Klosowska-Mikulan, E.
Wisniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/83377.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2002, 10, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of conspecifics on recruitment and behaviour of Dreissena polymorpha (Pallas, 1771)
Autorzy:
Kobak, J.
Powiązania:
https://bibliotekanauki.pl/articles/83806.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Behaviour of larvae, juveniles and adults of Dreissena polymorpha in the presence of the conspecifics was investigated in field and laboratory experiments. Mussel recruitment was studied in plastic chambers containing living conspecifics, their empty shells or calcareous, mussel-sized stones. The objects were glued to the chamber bottom and covered by nylon mesh. The experiment was carried out in the channel connecting the Port Zimowy harbour with the Vistula River (Toruń, Poland). Total mussel densities in the above treatments were the same as in the empty chambers. However, the distribution of the new settlers depended on the quality of the glued objects, with the vicinity of living mussels and empty shells being preferred to stones. This suggests that mussels responded to conspecifics after settling on substrate. Migration of juvenile and adult mussels in the presence of the same stimuli was then studied in a laboratory experiment. Both groups preferred the vicinity of living conspecifics, but any kind of the firmly attached objects decreased the number of individuals leaving the substrate, compared to the flat surfaces.
Źródło:
Folia Malacologica; 2003, 11, 3-4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of substratum type on attachment and survival of Dreissena polymorpha (Bivalvia)
Autorzy:
Kobak, J.
Januszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/83952.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
We studied the attachment strength of Dreissena polymorpha on nine artificial substrata in the laboratory. The highest attachment strength (0.46 N) was found on resocart (phenoplast plastic). It was lower on aluminium, acrylic, PVC, rubber and glass (listed in the order of decreasing strength), and the lowest on zinc, Penaten cream coating and copper. Apart from reducing adhesion, copper substratum caused also heavy mortality of the mussels. Further experiments, in which mussels were exposed on resocart surfaces in the presence of the examined materials (thus being influenced only by waterborne substances released by them), revealed that zinc and copper inhibited mussel attachment primarily by means of ions released to the water column. In the case of Penaten coating, the impact of its surface properties upon mussels seemed to be more important than waterborne cues.
Źródło:
Folia Malacologica; 2006, 14, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Malacofauna of two hydrologically different habitats in the near-shore zone of the Wloclawek dam reservoir (Vistula River, Poland)
Autorzy:
Zbikowski, J.
Kakareko, T.
Poznanska, M.
Kobak, J.
Powiązania:
https://bibliotekanauki.pl/articles/83518.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
We studied molluscan fauna at two sites in the W³oc³awek Dam Reservoir, differing with respect to the hydrological conditions: a rheolimnic site with a comparatively strong water flow (Soczewka) and a limnetic site, dominated by wave action (Dobiegniewo). Within each site, we sampled molluscs from three substratum types (sand, a thin layer of mud on sand and mud). Samples were collected monthly, from April to October. The taxonomic composition differed between the sites, with Sphaerium corneum (L. 1758), Pisidium sp. C. Pfeiffer, 1821, Bithynia tentaculata (L. 1758) and Viviparus viviparus (L. 1758) being more abundant in Soczewka, while Potamopyrgus antipodarum (Gray, 1843), Marstoniopsis scholtzi (Schmidt, 1856) and Dreissena polymorpha (Pallas 1771) occurred exclusively in Dobiegniewo. S. corneum was a strong dominant in most of the samples, and variation in its abundance was the only cause of the observed differences among the various substrata. Strong differences in the total density and biomass were also observed between the two sites, the molluscs from Soczewka being much more abundant. This phenomenon was particularly apparent on the muddy substratum, which was the most suitable in Soczewka and the poorest in Dobiegniewo. Our study revealed that moderate water flow in Soczewka affected molluscs by improving conditions for them, especially on the muddy substratum.
Źródło:
Folia Malacologica; 2007, 15, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Dynamics of a (Cd,Mn)Te Quantum Well in Pulsed Magnetic Field
Autorzy:
Kobak, J.
Goryca, M.
Kossacki, P.
Golnik, A.
Karczewski, G.
Wojtowicz, T.
Gaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/1791344.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
71.70.Gm
78.55.Et
75.75.-c
Opis:
In this paper we present studies of magnetization relaxation in a (Cd,Mn)Te quantum well containing 3.2% of Mn, after a pulse of magnetic field. The relaxation was found to be very fast, with dominant component faster than 10 ns. Upon application of static magnetic field the relaxation does not slow down, in contrast with the behavior of very diluted quantum wells or bulk material.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 907-908
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preferences of ponto-caspian and native amphipods to zebra mussel Dreissena polymorpha
Autorzy:
Kobak, J.
Poznanska, M.
Kakareko, T.
Powiązania:
https://bibliotekanauki.pl/articles/83921.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2010, 18, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of CdTe QDs Formed Using Zn Induced Reorganization
Autorzy:
Kobak, J.
Pacuski, W.
Jakubczyk, T.
Kazimierczuk, T.
Golnik, A.
Frank, K.
Rosenauer, A.
Kruse, C.
Hommel, D.
Gaj, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/2048054.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Ta
78.67.Hc
Opis:
In this paper we present optical studies of CdTe quantum dots formed using Zn-induced reorganization. The pattern of quantum dot photoluminescence lines is found to be similar to typical results reported for quantum dots grown with other techniques, although the positively charged exciton line is relatively more pronounced. Also the energy spacing between biexciton and exciton lines is found to be larger than in typical results. Zn-induced reorganization results in quantum dots density higher by an order of magnitude than in Te-induced quantum dots.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 627-629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colour morphs of Cepaea nemoralis (L.) differ in shell resistance to cracking
Autorzy:
Rosin, Z.M.
Kobak, J.
Lesicki, A.
Skorka, P.
Tryjanowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/84462.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
colour morph
morph
Cepaea nemoralis
shell resistance
cracking
shell colour
microclimate
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does predator-induced behaviour protect the zebra mussel from roach?
Autorzy:
Kobak, J.
Kakareko, T.
Powiązania:
https://bibliotekanauki.pl/articles/83691.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
predator
feeding
feeding behaviour
roach
Rutilus rutilus
zebra mussel
Dreissena polymorpha
mussel
animal behaviour
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MBE Growth and Characterization of a III-V Distributed Bragg Reflectors and InAs Quantum Dots
Autorzy:
Rousset, J.
Słupinski, T.
Jakubczyk, T.
Kobak, J.
Stawicki, P.
Gołasa, K.
Babinski, A.
Nawrocki, M.
Pacuski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1403611.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.67.Pt
68.37.Hk
Opis:
We describe the realization and characterization of a distributed Bragg reflectors and InAs quantum dots grown by molecular beam epitaxy. The distributed Bragg reflectors are based on a stack of eight or twenty pairs of GaAs and AlAs layers with a stopband centered at about E_0=1.24 eV (λ_0=1000 nm). The whole structures exhibit a reflectivity coefficient above 90%. The growth rate was monitored in situ by measurement of the oscillations of the thermal emission intensity. The investigations conducted on the InAs quantum dots grown on GaAs show photoluminescence around E=1.25 eV (λ=990 nm). The combination of these two elements results in the realization of a microcavity containing InAs quantum dots and surrounded by 20 pairs of distributed Bragg reflectors.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 984-987
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers
Autorzy:
Papaj, M.
Kobak, J.
Rousset, J.
Janik, E.
Golnik, A.
Kossacki, P.
Pacuski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1403629.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji
Opis:
We report on epitaxial growth of diluted magnetic semiconductor (Zn,Co)Te. Reflectivity spectra reveal excitonic transition which split under magnetic field due to giant Zeeman effect. Magnetooptical effects can be described using literature data.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1010-1011
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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