The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The activities of intercellular antioxidative enzymes: Superoxide dismutase, catalase and
glutathione peroxidase were estimated in control and trisomic human fibroblasts in culture.
It was found that in trisomic cells the activity of SOD is approximately 50% higher than in
control cells. The activity of glutathione peroxidase is increased by 30% in trisomic fibroblasts,
whereas catalase activity...
The purpose of this paper is to briefly review the structure and biological activity of
bacterial endotoxin. Endotoxin or lipopolisaccharide (LPS) is the major component of the
ou ter membranes of the cell walls of Gramm-negative bacteria. LPS consists of two parts: the hydrophobic lipid A and hydrophylic polysaccharide with contrasting chemical and physical properties. The toxic activity is principally...
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...
This article describes the term of photodynamic therapy, a relatively new way of cancer treatment and gives the rewiev of the commonly used photosensitizers, expecially the phthalocyanines
and their way of action. The last part is devoted to the action of PDT on human
erythrocytes.
The dioxins can reach the environment, can be also accumulated in living organisms and
make changes in normal function of these organisms. The article is a briefly review concerns
the toxity effect of dioxins on living organisms particularly on their cell membrane. This
review surveys the current state of knowledge concerning the mechanism of action of
2,3,7,8-tetrachlorodibenzo-p-dioxin on the...
In der vorliegenen Arbeit verwendete man die fluorymetrischen Methoden
aus DABA x 2HCl zur Bezeichnung der DNS-Lokalisierung in den Fraktionen des
alkalischen Gradients der Dichtigkeit der Sacharose. Man gebrauchte die menschlichen
Lymphocyten, die zur blastlschen Transformation mit Hilfe von Fitohemaglutyninum
(PHA+) angeregt wurden, diś nicht angeregten menschlichen
Lymphozyten (PHA-) und das...
Apoptosis is one of the kinds of cell death. This paper presents the morphological and
biochemical changes which are connected with apoptotic cell death. The factors, which activate
this process, are described in this article. Moreover the groups of genes, proteins and enzymes
that participate in the „call suicide” are characterised. The advantages and disadvantages of
the chosen methods of investigations...
The effects of organ ophosphorus insecticides (IFO), on the activity of gluthathione
S-transferase (GST) of pig lymphocytes were investigated. Activity of microsomal GST with
both CDNB and DCNB as substrates was observed, activity of cytosolic GST only with
CDNB. After incubation of lymfocytes with IFO (malathion and methylparathion), activity
of GST was increased. The observed changes were dependend...
Exposition of cells to UV radiation causes the different biological effects. In this paper
the effects of low power UV radiation on photoreceptor system are presented.
Exposure of cells to hyperthermic temperatures (43° to 48°C) results in an increase of
the total protein mass which coisolates with the nuclei. Prominent physiological effect of heat-shock on nuclear structure is inhibition of DNA replication and repair, and also RNA
synthesis and processing. Heat-shock-induced p rotein mass increase has been shown to
correlate with ultrastructural changes and...
The blood platelet activation plays an important role in haemostasis. Mechanism of
platelet activation is accompanied by intracellular signal transduction pathways that are
responsible for different physiological responses of platelets: changes in platelet shape, release
of their granule contents and platelet aggregation. Platelets circulate in vivo together with huge
masses of erythrocytes and...
This review presents the contemporary knowledge on the epidermal growth factor receptor
(EGFR) structure and function, and participation in neoplastic transformation. The EGFR
has been implicated in the pathogenesis of multiple human cells and tissues. Altered levels of
the receptor have been found in, among others, breast, prostate, and colon carcinomas.
Usually, overexperssion of EGFR appears...
During the 14 days period of development of the corn root the decrease of
dry mass, ribosomal and Iow molecular RNA content was observed in the 10-mm
root tip. The changes are statistically significant and they are of higher
values during the first 4 days of germination. The continuous decrease of
the dry mass content and RNA suggests that during the tested period of time
the number of cells...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.