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Przyjaźń i współpraca jako zasada postępu naukowego w fykologii [Friendship and cooperation as the principle of scientific progress in phycology]
Jadwiga Siemińska
These are personal reminiscences upon the scientific contacts of Slovak, Czech and Polish phycologists, and their achievements in the hard times of socialist rule after World War II.
Słowa kluczowe: history of phycology
Strony: 7-9
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Toksyny syntetyzowane przez sinice [The toxins of Cyanobacteria]
Marta Rogalska-Kupiec, Tadeusz Bochnia
The toxins of cyanobacteria excreted into habitat may become a source of intoxication for the people and animals. Waterblooms of cyanobacteria and intoxication with their toxins were registered all over the world except the Antarctic. Occurrence of waterblooms of cyanobacteria is induced by many factors e.g. eutrophization of water, pH, temperature, insolation and concentration of O2 i C02. The toxins of cyanobacteria belong to the most poisonous substances generated by the organisms (lethal dose is 9-500 ug kg/-1 ) . The toxins are forming a very differentiated group of chemical compounds like proteins, alkaloids and heterocyclic compounds. The toxins are divided into neurotoxins, hepatotoxins, dermatotoxins considering mechanism of their action and a type of damaged tissue. Neurotoxins (anatoxin-a, anatoxin-a(s), saxitoxin, neosaxitoxin) are responsible for damaging both the central and the peripherial nervous system through the repression of the cholinergic system. On the other hand hepatotoxins (microcistin, nodularin) are causing cirrhosis or tumor of the liver. Dermatotoxins (debromoaplysiatoxin, langbyatoxin) are generating acute dermatits or skin cancer. At the present time the most often used method of identification belong to three groups: chemical, immunological and mouse bioassay.
Słowa kluczowe: cyanobacteria, dermatotoxins, hepatotoxins, neurotoxins, toxic bloom
Strony: 11-19
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Lektyny roślin wyższych i ich specyficzność węglowodanowa [Lectins of higher plants and their carbohydrate-binding specificity]
Irena Lorenc-Kubis
Lectins are sugar-binding proteins or glycoproteins of nonimmune origin which agglutinate cells and/or precipitate glycoconjugates. The sugar specificity of lectins is usually established by the hapten inhibition technique in which different carbohydrates are tested for their ability to inhibit either hemagglutination or polysaccharide or glycoprotein precipitation by lectin. The results from such studies allow to classify the lectins into a small number of groups. Lectins with a similar specificity towards monosaccharides may differ in their affinity for particular disaccharides, oligosaccharides or glycopeptides. For some iectins no efficient monosaccharide inhibitors have been found; they are inhibited only by oligosaccharides. Several factors determine the interaction between lectins and their corresponding specific carbohydrate residues. These include surface charge, the anomeric sugar linkage and the location of the specific sugar residue in the carbohydrate chain. Many lectins recognise terminal nonreducing saccharides, while others also recognise internal sugar sequences. A few lectins recognise carbohydrate sequences together with the amino acid to which they are linked. The ready availability of lectins with different carbohydrate specificities has led to their extensive utilisation as reagents for the study of simple and complex carbohydrates in solution and on cell surfaces.
Słowa kluczowe: lectins, carbohydrate-binding, sugar chain structure
Strony: 21-33
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Sto lat od odkrycia – czy wiemy więcej o zarodkach antypodalnych? [One hundred years passed – do we know more about antipodal embryos?]
Maria Katarzyna Wojciechowicz
The occurrance of antipodal embryos is a very rare phenomenon. So far antipodal embryos have been observed only in several species belonging to different families of Angiospermae. For researchers, the possibility of antipodal embryo formation has been the subject of much controversy. Therefore in embryological manuals this problem is described no more than fragmentary and authors don’t quote a comprehensive list of plant species in which the antipodal embryos formation have been noticed. The aim of this work is to review literature refering the antipodal embryo formation and create the list of species in which the antipodal embryo have been observed so far.
Słowa kluczowe: antipodal embryo, embryology
Strony: 35-40
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Struktura i funkcjonowanie brodawek korzeniowych roślin motylkowatych [Structure and functioning of legume root nodules]
Wojciech Borucki
Legume root nodule organogenesis and functioning are described. Nodule is viewed as a set of compartments. Nodule is composed of cortex and bacteroidal tissue both derived from meristem. Within cortex and bacteroidal tissue some subcompartments exist functioning of which is tightly connected with nitrogen fixation. There are some constrains in nodule structure as bacteroid nitrogenase is an oxygen sensitive enzyme and on the other hand nitrogen fixation is a highly energy-consuming process. Oxygen diffusion barrier (present in nodule cortex?) and fine control of oxygen concentration within infected cells form a niche for bacteroids. Bacteroids can metabolise microaerobically and consume large amount of oxygen. Bacteroidal tissue is composed of infected and uninfected cells or infected cells only. Infected cells contain numerous symbiosomes that can be regarded as new intracellular compartment. Uninfected cells can be specialised metabolically and probably are spatially distributed within bacteroidal tissue in such a way that produces large surface of contact with infected cells. Relationships between plant development, bacteroid differentiation and nitrogen fixation are also presented. Nodule functioning under stress conditions and energy cost of nitrogen fixation are of interest as well.
Słowa kluczowe: root nodule, bacteroidal tissue, cell differentiation, bacteroids, nitrogen fixation
Strony: 41-61
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Portrety botaników polskich [Portraits of Polish botanists]
Strony: 63-64
Tadeusz Tacik
Jan J. Wójcicki
Tadeusz Wojciech Wilczyński
Piotr Köhler
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Rozstania [Obituaries]
Strony: 65-67
Doc. dr bab. Stanisława Czaplińska z domu Piestrakiewicz (4 V 1917-17 V 1997) [Doc. dr hab. Stanisława Czaplińska, neé Piestrakiewicz (4 V 1917-17 V 1997)]
Wanda Truszkowska
Doc. dr hab. Maciej Czarnowski (5 II 1910-3 III 1997)
Jan Sarosiek
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Rocznice, jubileusze [Anniversaries, jubilees]
Strony: 68-74
Pro memoria (H. Czeczottowa, J. Lilpop. J. A. Helwing, T. Bocheński, H. Juraszek)
Alicja Zemanek
Prof. dr hab. Jadwiga Siemińska – w pięćdziesięciolecie pracy naukowej [Professor Jadwiga Siemińska – fifty years of scientific work]
Konrad Wołowski
Obchody 70-lecia rezerwatu leśno-stepowego “Bielinek” nad Odrą [70 years of existence of wood-steppe nature reserve “Bielinek” on Odra river]
Marian Ciaciura, Monika Radziszewicz
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Sprawozdania ze spotkań naukowych [Scientific meeting reports]
Strony: 74-93
V Międzynarodowe Sympozjum Arktycznej i Alpejskiej Mikologii (ISAM V) (Łabytnangi, Rosja, 15-27 sierpnia 1996) [5th International Symposium on Arcto-Alpine Mycology (ISAM V) (Łabytnangi, Russia, 15-27 August 1996)]
Andrzej Chlebicki
Międzynarodowa Konferencja – “Szczyt Ekologiczny’96” (Kopenhaga, Dania, 18-23 sierpnia 1996) [“Ecological Summit “96” – International Conference (Copenhagen, Denmark, 18-23 September 1996)]
Andrzej Nienartowicz
“Kontaminacje bakteryjne i bakteriopodobne w kulturach tkanek roślinnych” – II Mięzynarodowe sympozjum (Cork, Irlandia, 3-6 września 1996) [“Bacterial and bacteria-like contaminants of plant tissue cultures” – II International Symposium (Cork, Ireland, 3-6 September 1996)]
Elżbieta Zenkteler
Botanika na XX Międzynarodowym Kongresie Historii Nauki (Liege, Belgia, 20-26 lipca 1997) [Botany in the 20th International Congress of History of Science (Liege, Belgium, 20-26 July 1997)]
Piotr Köhler, Alicja Zemanek
VIII Spotkanie Komitetu do Spraw Kartowania Flory Europy pod hasłem: “Problemy chorologiczne flory europejskiej” (Helsinki, Finlandia, 8-10 sierpnia 1997) [8th Meeting of the Committee for Mapping the Flora of Europe “Chorological problems in the European Flora” (Helsinki, Finland, 8-10 August 1997)]
Maria Zając
Obóz naukowy Koła Przyrodników Wyższej Szkoły Pedagogicznej w Krakowie (Jaworze, Polska, 4-14 sierpnia 1997) [Scientific excursion of Naturalist Society of the Teachers Training School in Cracow (Jaworze, Poland, 4-14 August 1997)]
Beata Barabasz
40. Sympozjum Międzynarodowego Towarzystwa do Badań Roślinności (IAVS) (České Budějovice, Czechy, 18-22 sierpnia 1997) [40th Symposium of the International Association for Vegetation Science (IAVS) (České Budějovice, Czech Republic, 18-22 August 1997)]
Stefania Loster
V Warsztaty Archeobotaniczne (Igołomia, Polska, 2-4 września 1997) [5th Archaeobotanical Workshop (Igołomia, Poland, 2-4 September 1997)]
Maria Lityńska-Zając
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Z życia PTB [Polish Botanical Society News]
Strony: 93-94
Zebranie Sekcji Historii Botaniki PTB (Kraków, 30 października 1997) [Meeting of the Section of History of Botany of the Polish Botanical Society (Cracow, Poland, 30 October 1997)]
Piotr Köhler
“Czwartki botaniczne” w Oddziale Krakowskim PTB w IV kwartale 1997 [“Botanical Thursdays” at the Polish Botanical Society, Cracow Division, in 4th ąuarter of 1997]
Józef Mitka
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Varia
Strony: 94-99
Mistrz i uczeń [Master and pupil]
Ludwik Frey
XIV konkurs dendrologiczny w Łodzi – “Znam drzewa i krzewy” [14th Dendrological Competition in Łódź – “I know trees and shrubs”]
Jan T. Siciński
Konkurs dendrologiczny – “Drzewa obok mnie” [Dendrological Competition – “Trees next to me”]
Artur Obidziński
Leksykon botaników polskich: 20. Kazimierz Albin Roch Filipowicz [Dictionary of Polish botanists: 20. Kazimierz Albin Roch Filipowicz]
Cezary W. Domański
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Polemiki i dyskusje [Polemics and discussions]
Strony: 99-100
Minionych epok czar [Charm of passed epoch]
Wiesław Fałtynowicz
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Nowe periodyki i serie [New periodicals and series]
Strony: 100-102
Jan J. Wójcicki
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Recenzje [Book reviews]
Strony: 102-114
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Nadchodzące spotkania [Forthcoming meetings]
Strony: 114-116
Jan J. Wójcicki
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Literatura botaniczna [Botanical literaturę]
Strony: 117-119
Jan J. Wójcicki
