Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 10

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Datura stramonium
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
This paper reports a study of the alkaloid content of different parts of Datura stramonium L. (Solanaceae) in various stages of its growth and development, and the location, structure and ultrastructure of alkaloid-biosynthesizing cells (idioblasts) in different parts of naturally grown and cultured plant material. TLC, HPLC, and GC/MS methods were used for alkaloid assays. The results showed that alkaloid production starts from the end of the second week after seed germination, increases in different organs up to the tenth week of growth, and then decreases. Leaves and capsules showed the highest alkaloid content in the vegetative and generative stages, respectively. In leaves the alkaloids decreased rapidly in the generative stage. The highest alkaloid content was recorded in vegetative leaves, followed in descending order by vegetative petioles, generative and vegetative stems, generative petioles, generative roots, generative leaves, vegetative roots and mature seeds. The organs as well as calli derived from different leaf parts were examined for the presence of idioblasts by microscopic and cytochemical methods. Idioblasts were present only in semi-hyaline callus originated from leaf base; they were spherical or oval, with a thick cell wall and large central vacuole. These observations should prove helpful in attempts to produce specific alkaloids in naturally grown plants and cell cultures.
Expression of N-cadherin an adhesion molecule of the cadherin family, in tumor cells is associated with their increased invasive potential. Many studies suggested the role of N-linked oligosaccharides as important factors that contribute to metastasis by influencing tumor cell invasion and adhesion. N-cadherin is a heavily glycosylated protein. We have analysed the carbohydrate profile of this protein synthesized in hu­man melanoma cell lines: WM35 from the primary tumor site and WM239, WM9, and A375 from different metastatic sites. N-cadherin was immunoprecipitated with anti-human N-cadherin polyclonal antibodies. Characterisation of its carbohydrate moieties was carried out by SDS/PAGE electrophoresis and blotting, followed by im- munochemical identification of the N-cadherin polypeptides and analysis of their glycans using highly specific digoxigenin or biotin labelled lectins. The positive reac­tion of N-cadherin from the WM35 cell line with Galanthus nivalis agglutinin (GNA), Datura stramonium agglutinin (DSA) and Sambucus nigra agglutinin (SNA) indicated the presence of high-mannose type glycans and biantennary complex type oligosac- charides with a2-6 linked sialic acid. N-cadherin from WM239, WM9, and A375 cell lines gave a positive reaction with Phaseolus vulgaris leukoagglutinin (L-PHA) and lo­tus Tetragonolobus purpureas agglutinin (LTA). This indicated the presence of tri- or tetra-antennary complex type glycans with a-fucose. In addition, N-cadherin from WM9 (lymphomodus metastatic site) and A375 (solid tumor metastatic site) contained complex type chains with 2–3 sialic acid (positive reaction with Maackia amurensis agglutinin — MAA). The results demonstrated that N-glycans of N-cadherin are altered in metastatic melanomas in a way characteristic for invasive tumor cells.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.