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ESR of Gd(Al_{1-x}M_{x})_{2}; M = Ge, Sb Laves Phase Compounds

100%
Jarosz J.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 2
339-341
EN
ESR measurements for Gd(Al_{1 -x}Ge_{x}) and Gd(Al_{1-x}Sb_{x}) pseudobinary systems with x ≤ 0.15 are presented. In all investigated compounds a marked change in thermal broadening of the line width was observed in temperature lower than 300 K. Using obtained results the bottleneck parameter was calculated as a function of concentration x.
2

Polydnaviruses of hymenopteran endoparasitoids knock out the host insect immune response

63%
Glinski Z., Jarosz J.
|
|
vol. 44
87-94
EN
The insect immune system reacts against invading microorganisms and parasites with the recruitment of haemocytes and with humoral response. Cellular immune reactions involve phagocytosis, nodule formation and encapsulation by different types of haemocytes whereas insect cell-free antibacterial immunity depends on the production of a number of peptides and proteins, among which lysozyme, cecropins and attacins represent the major group of immune proteins. Polydnaviruses from certain hymenopterous parasitoids interfere with both host immunity and host development. These immunosuppressive viruses exhibit an intimate genetic relationship with the parasitoid since viral sequences are integrated within the parasitoid chromosomal DNA. The viral genes expression in parasitized host induces immunosuppression and alters development of the host insect. The parasitoids developing in the host body cavity knock out the insect immune system, inducing a decline in cellular and humoral components of the immune system so that parasitoid eggs are not recognized as foreign and thereby are not encapsulated. Polydnaviruses carrying parasitoids escape the host immune response and may develop within the insect host whereas other invaders are normally destroyed by defense factors of insect haemolymph.
3

Immune phenomena in echinoderms

63%
Glinski Z., Jarosz J.
Archivum Immunologiae et Therapiae Experimentalis
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2000
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vol. 48
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issue 3
189-193
EN
Advances in biochemistry and molecular biology have made it possible to identify a number of mechanisms active in the immune phenomena of echinoderms. It is obvious that echinoderms have the ability to distinguish between different foreign objects (pathologically changed tissues, microorganisms, parasites, grafts) and to express variable effector mechanisms which are elicited specifically and repeatably after a variety of non-self challenges. The molecular and biochemical basis for the expression of these variable defense mechanisms and the specific signals which elicit one type of effector mechanism are not, however, yet well known. The high capacity of coelomocytes to phagocytose, entrap and encapsulate invading microorganisms is a valid immune cell-mediated mechanism of echinoderms. The entrapped bacteria, discharged cellular materials and disintegrating granular cells are compacted and provoke the cellular encapsulation reaction. Moreover, humoral-based reactions form an integral part of the echinoderm defense system against microbial invaders. Factors such as lysozyme, perforins (hemolysins) vitellogenin and lectins are normal constituents of hemolymph, while cytokines are synthesized by echinoderms in response to infection.
4

Earthworm immune responses

63%
Jarosz J., Glinski Z.
Folia Biologica
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1997
|
vol. 45
1-9
EN
The knowledge of the immunity in annelids started with the use of earthworms as biomarkers indicating changes caused by environmental pollution. Defence strategies effectively protect earthworms against bacterial infections and parasitic invasion. A natural immunity formed by anatomical and chemical protective barriers prevents damage of the underlying tissues, body fluid losses, and microbial infections of the body cavity. The internal defence mechanisms of annelids involve phagocytosis, nodule formation and encapsulation, blood coagulation and wound repair, and antibacterial immune proteins. The antibacterial activity of coelomic fluid associated with lysozyme-like substances and inducible humoral molecules support haemocytic reactions in the annelid defence system.
5

Advanced glycation end-products prepared in solution under high pressure contain epitopes distinct from those formed in the dry reaction at high temperature

51%
Staniszewska M., Jarosz J., Jon M., Gamian A.
Archivum Immunologiae et Therapiae Experimentalis
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2005
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vol. 53
|
issue 1
71-78
EN
Advanced glycation end-products play an important role in diseases related to diabetes and aging processes. Model compounds are synthesized in order to prepare the diagnostic and experimental tools for studying the mechanisms of pathogenesis. The objective of the present study was to accelerate glycation and upgrade its efficiency under high-pressure conditions.Aqueous solutions of proteins were kept with carbohydrates under a pressure of up to 850 MPa for several hours. Then the high-pressure glycation (HPG) products were fractionated on a Sephadex G-200 column and characterized with SDS-PAGE and MALDI-TOF mass spectrometry. The low-molecular-mass fraction of glycated proteins was separated from the two fractions containing high- and intermediate-molecular-mass cross-linked products of glycation. The products were then compared with those obtained with the high-temperature glycation (HTG) procedure carried out in dry conditions with a lyophilized mixture of substrates. The fractionated products were used to prepare rabbit sera. The immunoblotting experiments showed that the epitopes on the cross-linked glycation products formed in solution under high pressure differed from those originating in dry conditions at high temperature. Sera against the HPG products were specific to homologous material and did not interact with the fractions obtained by HTG. The antibodies against HTG products recognized HTG but not HPG products.
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