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1

Lysozyme-like activity in eggs and in some tissues of land snails Helix aspersa maxima and Achatina achatina

100%
Fiolka M. J., Witkowski A.
Folia Biologica
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2004
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vol. 52
|
issue 3-4
233-237
EN
Antibacterial lysozyme-like activity against Micrococcus luteus in eggs and some tissues of snails Helix aspers maxima and Achatina achatina was detected in a turbidimetric standard assay. The bacteriolytic activity in Helix aspersa maxima was higher than in Achatina achatina. After the application of the bioautography technique, several lytic zones of Micrococcus luteus were observed in both studied species. Electrophoresis in denaturing conditions followed by immunodetection of lysozyme using EWL antibodies indicated the presence of several lysozyme forms in the tested snails.
2

The bentic diatoms of the Bandar Tawahi (Gulf of Aden, Republic of Yemen)

100%
Bafana C. A., Witkowski A.
|
EN
Diatoma from the surface sediments of the coastal area of Bandar Tawahi, a small embayment of the Gulf of Aden (Khormaksar), were studied by means of light (LM) and electron microscopes (SEM and TEM).Species analysis revealed the presence of numerous taxa, some of which are rare and little known such as: Mastoneis biformis, Navicula giffeniana and N. platyventris.In the case of each species, the ecological requirements (salinity preferences, life form) and geographical distribution are given.
3

Occurence and significance of Chaetoceros (Bacillariophyceae) reasting spores in the Holocene sediments of the Baltic Sea

81%
Stachura-Suchoples K., Zgrundo A., Witkowski A.
Oceanological Studies
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1998
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vol. 27
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issue 2
87-92
EN
The material studied originated from the marine Holocene sediments of the Gulf of Gdansk and from Kiel Bay. During the diatom analysis, the interest was focused on the dominance of Chaetoceros resting spores. An abundant occurrence of such resting spores was interpreted in terms of changes of environmental conditions in the study areas. In the fossil sediments, it indicated the inflow of the oceanic waters which caused the salinity increase and the natural rise in the nutrient content, whereas in the subfossil sediments, it marked the increasing human impact.
4
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Infrared Spectra of Retarded Molecular Oscillator

81%
Witkowski A., Henri-Rousseau O., Blaise P.
Acta Physica Polonica A
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1997
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vol. 91
|
issue 3
495-504
EN
Theoretical interpretation is proposed for the inhomogeneous broadening of the infrared line shapes of high harmonics of hydrogen containing modes observed by the optoacoustic and thermal lensing spectroscopy in the liquid phase of benzene and other organic transparent liquids. Attention is focused on the experimental fact that both line width and asymmetry factors of the harmonic series increase linearly with the harmonic number for which fact no satisfactory theoretical understanding was still available. This interpretation is based on recently proposed new approach to separation of electronic and nuclear movements accounting for the finite velocity of the π electronic cloud of vicinal molecules and its retardation in following the protonic motion. This retardation leads to the time dependence of molecular oscillator which may be viewed as anharmonic. The experimental results concerning the linear increase in the line width and the asymmetry factor with increasing order of the harmonic are well represented.
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