PubMed Health⌕ Search

Biomedical subjects

I Hajdu

Publications and source records attributed to I Hajdu.

At least 37 records · Page 2Linked to original sources
PubMed1982

[Ultrastructure of blood lymphocytes in dairy cows with chronic lymphocytic leukemia].

The morphology of blood lymphocytes was studied ultrastructurally in cows with chronical lymphocytic leucosis (CLL) and in healthy controls. A significantly higher occurrence of the so-called nuclear pockets in the leucaemic lymphocytes was found (13.8% v. 0.83% in healthy animals). The surfaces of lymphocytes were stained with ruthenium red; this showed the possibility of differentiating two distinct populations of lymphocytes in peripheral blood. In this way, a prevalence of B-lymphocytes, constituting 89.7% of all lymphocytes, was demonstrated in animals suffering from CLL.

Animals↗
PubMed1979

Morphology of the antibody response to pneumococcal polysaccharide in mice.

In the course of an antibody immune response to pneumococcal polysaccharide - type III (S III) in mice a slight increase was observed in the proportion of plasma cells among the antibody-producing cells, reaching its peak at the time of decline of this reaction. On the basis of ultrastructural resemblance of these plasma cells to primitive reticular cells and in view of other specificities of the immunological response to S III antigen, the author presumes direct reticular origin of anti-S III antibody-producing plasma cells.

Animals↗
PubMed1977

[Formation and release of antibodies in lymphocytes].

An immunohistochemical study proved that lymphocytes were the dominant cell type responsible for the production of antibodies during the local humoral immune response to human serum albumin in the mouse omentum. Ultrastructurally, specific antibodies were detected on ribosomes and polysomes linked to the perinuclear cisterna and placed in it, as well as on the free intracytoplasmic ribosomes and polysomes. In no case antibodies were found in other cell organelles involved in protein synthesis. Most probably the mechanismus of antibody release from lymphocytes are different from similar processes taking place in plasma cells.

Animals↗
PubMed1977

[Development of arrangement and degradation of the system of rough endoplasmic reticulum in antibody-producing plasma cells].

During the immune response of the cells of murine omentum to horseradish peroxidase which had been administered intraperitoneally together together with endotoxin or endotoxoid acting as an adjuvans the plasma cells showed several different patterns of the rough endoplasmic reticulum [RER] system. Irregular to bizarre RER structures occurred plasma cells during the initial phase of the immune reaction only, whereas the plasma cells found at later stages had characteristic highly organized RER systems. The irregular "atypical" RER patterns have been regarded by some authorities as fully functional structures developed under the influence of a rapid differentiation of immunocompetent cells following administration of mitogens as well as due to a variously pronounced toxic influence of mitogens upon cell organelles. The possibilities of RER system degradation and the fate of antibodies which had not been discharged by the plasma cells has been discussed.

Animals↗
PubMed1976

[The ultrastructure of bovine lymphocytes in chronic lymphocytic leucosis].

The morphology of blood lymphocytes as obtained from cows suffering from chronic lymphocytic leucosis (CLL) and from healthy control animals was studied with the electron microscope. In the leukemic lymphocytes there was a significantly higher occurrence of the so-called nuclear pockets (13.8 per cent in the healthy ones). Marking the surface of the lymphocytes with Rutherium Red permitted to discern between two distinct populations of lymphocytes in peripheral blood. By using this method, B-lymphocyte were shown to prevail in CLL, accounting for 89.7 per cent of the total lymphocyte count.

Animals↗
PubMed1975

Experimental immune complex glomerulopathy: immunomorphological aspects and correlations with human disease.

Thirteen rabbits received parenteral injections of human serum albumin (HSA) in regular doses and intervals during 6-32 seeks. The antigen load elicited immune responses of variable degree, giving a good correlation with the extent and quality of immune complex (IMC) deposition, as shown by immunological methods, electron and fluorescence microscopy and by histoautoradiography. Morphology of immune deposits (IMD) depended on the composition of the IMC and produced a continuous scale of glomerular involvement, ranging from minimal and focal to massive and diffuse deposition. Probable rudimentary traces of IMD were apparent in the ultrastructure even in animals with negative results of both immunological and immunfluorescence examinations. The relationships are discussed between experimental IMC-induced glomerulopathy on the one hand, and some problems of development and bioptic evaluation of human glomerulonephritis.

Animals↗
PubMed1975

The development of the tympanic sinus.

On the examination of 200 embryonal petrous bones the factors affecting the morphology of the tympanic sinus under physiological conditions are discussed. The development of the tympanic sinus begins during the fourth month of embryonic life. In an embryo of 5 months the floor of the tympanic sinus developing between the cochlea and the vestibulum consists of lamellae resembling a wicker basket. Caudally, its floor reaches at first the lower part of the tympanum, for at this stage the styloid prominence and the pavimentum pyramidis are not yet fully developed. In the eighth and ninth month of foetal life the tympanic sinus is narrowed by the styloid prominence, from the floor and from the cranial side it is bordered by the fully developed ponticulus medialis. In postnatal life the development of the membranous bony substance of the promontory, subiculum promontorii and styloid prominence, each narrows the tympanic sinus in some degree. Under the influence of vascular factors highly developed trabeculae and lamellae are formed in them. The cavity is deeper in the dolichocephalics and is more shallow in brachycephalics.

Age Factors↗
PubMed1975

Adherent and non-adherent mouse peritoneal exudate cells.

Administration of proteose peptone to donors of peritoneal exudate cells resulted not only in quantitative increase in the mono-histiocytic cells but also in their activation as judged by their rapid adherence to surfaces, strong acid phosphatase reaction and increased numbers of lysosomes and phagocytic vacuoles. The three-hour adherent fraction of peritoneal exudate cells (from normal as well as peptone-stimulated mice) contains a large number of activated lymphocytes and fibroblastoid cells and is not enriched in macrophages. Moreover, the adherent cells, when collected by scraping, are unsuitable for immediate biological use since they lose the enzymatic equipment. For purification of histiocytes and macrophages by adherence, the 2-day cultivation of peritoneal cells was found to be optimal, as judged by the number of acid phosphatase positive cells. Their decrease after 4-day cultivation may indicate over-growth of the fibroblast and epithelial cell lineages. The non-adherent fraction was found to be enriched in lymphocytes as well as in mast cells; numerous macrophages were observed, too.

Animals↗