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1

The uptake and accumulation of iron by the intestinal bacterium Desulfotomaculum acetoxidans DSM 771

100%
Pado R., Pawlowska-Cwiek L.
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|
issue 1-2
79-81
EN
Sulfate-reducing bacteria (e.g. Desulfotomaculum acetoxidans) exist in animal intestine. These bacteria are able to bind heavy metals (e.g. cadmium or lead). Comparative investigations on the composition of cellular walls of Desulfotomaculum acetoxidans - depending on the initial Fe2+ supplement in the medium (7.5, 57.5 and 507.5 M) were performed. Iron(II) was cumulated as FeS or as pyrite (FeS2). However, if the initial amount of iron was higher, its majority (46% 85%) was transported onto the membrane. It was determined that the siderophore found in Desulfotomaculum acetoxidans was deferroxamine as in animals.
2

Cell walls as a source of signals regulating the fate and development of plant cells

88%
Rodakowska E., Kasprowicz A., Lapa A., Luczak A., Derba M., Wojtaszek P.
Biotechnologia
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2006
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issue 4
18-35
EN
Cell walls are the outermost functional zone of plant cells. Although they surround individual cells, at the same time they form a part of supracellular structure ? the apoplast. On the other hand, they are also an indispensable component of the structural and functional continuum formed between cell wall, plasma membrane, and cytoskeleton (WMC continuum), and spanning the whole cell. Thus, cell walls are crucial for the communication of cells with their surrounding. This paper constitutes a short review of the importance of plant cell walls as a source of signalling molecules. Particular attention is paid to: 1) cell walls as a kind of mechanical system characteristic to plants; 2) generation and transport of extracellular signalling molecules, such as signalling peptides and oligosaccharins; 3) apoplastic source of reactive oxygen species and nitric oxide. The review is supplemented with the description of selected results coming from our research group.
3

Cellular aspects of regeneration in protoplast culture of yellow lupin (Lupinus luteus L.)

88%
Wiszniewska A., Pindel A.
Biotechnologia
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2010
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issue 2
18-22
EN
Yellow lupin (Lupinus luteus), like many other Fabaceae species, exhibits strong recalcitrance to in vitro conditions of protoplast culture, where regeneration capacity is extremely limited, and only incipient mitoses are observed. In case of the restricted morphogenetic potential of yellow lupin protoplasts, special attention should be paid to the cellular mechanisms that control gaining of totipotency in culture. These are especially: the structure and functioning of new cell wall, elements of cytoskeleton, as well as some cell components of signaling properties. Detailed investigation on these structures and their behaviour in culture conditions may contribute to the understanding and bypassing of the recalcitrance problem in yellow lupin.
4

Expansins unique plant proteins

75%
Luczak M., Wojtszek P.
Biotechnologia
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2002
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issue 4
176-189
EN
Expansins are extracellular proteins which are able to loosen cell walls thus making possible the extension and stress relaxation of plant walls. Expansins are classified on the basis of sequence similarities and substrate specificity into two subfamilies of a- and b-expansins. The expansins? mode of action is based on the weakening of hydrogen bonds between cellulose microfibrils and on interacting matrix polymers, especially hemicelluloses. However, they do not reveal any hydrolytic or proteolytic activity. The activity of expansins is decisive for the control of plant cells? shape, and thus these proteins are thought to be an important component of biochemical machineries controlling cell growth and differentiation, as well as plant morphogenesis and development. This article reviews the advances made since the discovery of expansins and describes their characteristic features, including protein structure and biochemical mode of action, molecular organisation of expansin-coding genes, and biological functions of these unusual proteins.
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