Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
enabled [disable] Abstract
Number of results

Results found: 23

Number of results on page
first rewind previous Page / 2 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 2 next fast forward last
2
Publication available in full text mode
Content available

Hemoglobiny bakterii

100%
EN
The aim of this paper is to summarize the publications concerning the bacterial hemoglobin (Vitreoscilla). This is the first bacterial hemoglobin to be sequenced and physicochemical properties are determined. It showed the maximum sequence homology (24%) with lupin leghemoglobin (Lg) which properties also have been presented. Bacterial hemoglobin may function to enable the organism to survive in oxygen-limited environments by acting as an oxygen storage-trap or to facilitate oxygen diffusion.
EN
The paper contains editorial and stylistic requirements posed to diploma dissertations in the range of molecular biology. The instructions and remarks given should help students preparation of the first scientific account i.e. their Magister dissertation.
EN
Oxygen affinity of respiratory proteins is characterized by three parameters: P50, n, K (terms of the Hill plot). They are derived from oxygen dissociation curves determined usually by the spectrophotometric method. The allosteric properties of respiratory proteins are examined by comparing the experimental data to MWC model. A computer program was written and the program calculated the rood mean square deviation between the data points (Amstrad CPC 464). From the lower and upper asymptotes of the Hill plots the 1CK and K1 values could be obtained as a first approximation. The computer-fitting program allowed to determine the allosteric parameters.
6
100%
EN
This paper presents an outline of the activity of Laboratory of Biological Sciences of the University of Łódź during the first ten years of its existence (1974-1984).
EN
The following parameters were determined in the serum of three crayfish species occuring in Poland (Astacus astacus, Astacus leptodactylus Orconectes limosus): pH, cations content (Ca, Mg, Na, K) and per cent content of individual hemocyanin (He) components. In parallel, oxygen affinity of the serum (n, log P50) was measured. Correlation relationship were checked between the parameters studied.
9
Publication available in full text mode
Content available

Hemocyjaniny stawonogów

64%
EN
In this paper the news hypothesis of structure of arthropods hemocyanin were presented. One also particulary discussed the constitution of this proteins components. The heterogeneity Hc on the level of polypeptide chains was considerated. The function performed by respective subunits (chains) in the constitution of bigger hemocyanins aggregates was attempted.
10
64%
EN
In invertebrates various proteins play the role of oxygen transporter. They are dissolved in fluids of the respiratory system or present in its cells. These proteins occur also in other tissues, and therefore are called tissue hemoglobins. They play an important role evidenced by occurrence in tissues of animals possessing no other respiratory proteins in their blood or hemolymph. This paper presents the occurrence of hemoglobins in the animal kingdom and their physico-chemical properties, with special attention paid to the oxygen affinity.
EN
The destructive role of reactive oxygen species (ROS) in cell and tissue damage is well documented. However, so far a very little is known about their role as a regulating factor in the cellular metabolism. At present, we cannot judge out whether the superoxide radicals are beneficial or harmful to the organisms. Their positive or negative influence each time is determined by a numerous factors (e.g. site and time of radicals generation as well as their concentration). This may lay down a t the bottom of some conflicting observations in free radical biology. The controversial role of the superoxide radicals in the vital metabolic processes (inflammation, proliferation, malignant transformation, apoptosis and lipid peroxidation) is discussed.
14
64%
PL
Stwierdzono obecność dwóch frakcji hemocyjaninowych w hemolimfie raka amerykańsklego i błotnego oraz trzech w hemolimfie raka szlachetnego. Zawartość procentowa hemocyjaniny w hemolimfie trzech gatunków raków wynosi- ponad 90%. Hemocyjanina jest kompleksem glikolipoproteidowym, a punkty izoelektryczne jej podjednostek mieszczą się w granicach pH 5-8. Długi okres przechowywania hemolimfy w temperaturze -20°C powoduje degradacje hemocyjaniny na mniejsze podjednostki, które zachowują jednak najprawdopodobniej swoje własności funkcjonalne.
FR
On a mis en evidence la presence de deux fractions d'hemocyanine dans 1'hemolypmhe d'Orconectus limosus et Astacus leptodactylus mais trois fractions dans 1 ’hśraolymphe d'Astacus astacus. La teneur en hemocyanine dans l'hśmolymphe est plus que 90% ehez tous les trois especes des ecrevisses. l'Hemocyanine est le complexes glycclipoproteiąue et les points isoelectriąues de ses sous-unites se trouvent a pH 5-8. La conservation a -20°C cause la degradation de cette protśine mais les sous-unites gardent toujours ses proprietes fonctionelles.
15
64%
EN
There are a lot of contrary opinions concerning the riumber and structure of embryo hemoglobins. The aim of this paper is to gather the recent works on this subjects. On the base of numberous papers publJshed in the last years it has been assumed that in human onthogenesis there are different embryo hemoglobins: Hb Gower 1, Hb Gower 2, Hb Portland, two kinds of foetal hemoglobins and three kinds of adult hemoglobins. The number, chemical, structure and physicochemical properties have been demonstrated together with oxygea-affinity especially concerning human embryonic hemoglobins. The development of red cells has been presented together with relation beetwen the site of erythropoesies and different kinds of synthetised hemoglobins.
20
Publication available in full text mode
Content available

Adaptacja homeowiskotyczna ryb

52%
EN
Homeowiscous adaptation is a common phenomenon observed in poikilotherms which remain active at different temperatures. It is usually caused by changes in fatty acids pool in cellular membranes, what enable to maintain the physical structure of their membranes within tolerable limits. The increased unsaturaition of membrane lipids has as its basis some changes in activity of the appropriate enzymes. Fluctuations in fluidity of membrame lipids activate transcription of the genes for the suitable enzymes.
first rewind previous Page / 2 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.