202 research outputs found
Antropológia és neveléstörténet
Az elmĂşlt nĂ©hány Ă©vtizedben a pedagĂłgiai antropolĂłgia divatossá válásának lehetĂĽnk tanĂşi. A vizsgálĂłdások közĂ©ppontjában mindig a kĂĽlönfĂ©le kultĂşrák interakciĂłja, valamint az oktatás/nevelĂ©s összefĂĽggĂ©seinek vizsgálata áll. Az antropolĂłgiai megközelĂtĂ©s sajátja, hogy mind idĹ‘ben, mind vizsgálandĂł szempontok tekintetĂ©ben a lehetĹ‘ legszĂ©lesebbre nyitja a lehetĹ‘sĂ©geket. Erre jĂł pĂ©ldát szolgáltatott a 2007. november 30. Ă©s december 1. között a VeszprĂ©mi AkadĂ©miai Bizottság szervezĂ©sĂ©ben megrendezett TörtĂ©neti antropolĂłgia Ă©s nevelĂ©s – KultĂşrák találkozása cĂmű konferencia
Ăšj nemesĂtĂ©sű balkonnövĂ©nyek klĂmatűrĂ©se Ă©s peroxidáz aktivitása
A dĂsznövĂ©nytermesztĂ©sben Ă©s -kereskedelemben tavasszal Ă©s kora nyáron jelentĹ‘s szerepet töltenek be az egynyári dĂsznövĂ©nyek, ezen belĂĽl pedig a balkonnövĂ©nyek. A világszerte hagyományosan ĂĽltetett muskátlik mellett több faj kerĂĽlt termesztĂ©sbe.
KĂsĂ©rleteim során cĂ©lom volt, hogy ezen állandĂłan bĹ‘vĂĽlĹ‘ növĂ©nycsoportbĂłl olyan Ăşjdonságokat válasszak ki, melyek jĂłl tűrik a hazai szĂ©lsĹ‘sĂ©ges klĂmát Ă©s kielĂ©gĂtĹ‘en dĂszĂtenek. NĂ©hány, balkonnövĂ©nykĂ©nt mĂ©g kevĂ©sbĂ© vizsgált magyar nemesĂtĂ©sű fajta alkalmazhatĂłságát is vizsgáltam. A fajtaĂ©rtĂ©kelĂ©sek során Ă©s nĂ©hány vegetatĂvan szaporĂtott balkonnövĂ©ny gyökeresedĂ©se közben a peroxidáz (POD) stresszenzimek szintjĂ©nek változásait is nyomon követtem. (...
Antropológia és neveléstörténet
Az elmĂşlt nĂ©hány Ă©vtizedben a pedagĂłgiai antropolĂłgia divatossá válásának lehetĂĽnk tanĂşi. A vizsgálĂłdások közĂ©ppontjában mindig a kĂĽlönfĂ©le kultĂşrák interakciĂłja, valamint az oktatás/nevelĂ©s összefĂĽggĂ©seinek vizsgálata áll. Az antropolĂłgiai megközelĂtĂ©s sajátja, hogy mind idĹ‘ben, mind vizsgálandĂł szempontok tekintetĂ©ben a lehetĹ‘ legszĂ©lesebbre nyitja a lehetĹ‘sĂ©geket. Erre jĂł pĂ©ldát szolgáltatott a 2007. november 30. Ă©s december 1. között a VeszprĂ©mi AkadĂ©miai Bizottság szervezĂ©sĂ©ben megrendezett TörtĂ©neti antropolĂłgia Ă©s nevelĂ©s – KultĂşrák találkozása cĂmű konferencia
Synanthropic spread of some salt tolerant plant species along roadsides in the continental part of Croatia
Our research was carried out in northern Croatia from 2018 to 2022 and we investigated the distribution of salt-tolerant plant species along roads (mainly along motorways) in a total of 51 study sites. We were the first to detect Cochlearia danica, a halophyte characterized by an Atlantic distribution, in the Croatian flora. We demonstrated the distinct roadside spread of Desmazeria marina, Parapholis incurva and Sagina maritima in a northerly direction towards the interior of the mainland. We recorded the mass occurrence of several salt-tolerant species already well documented in Central Europe along the surveyed motorways (e.g. Plantago coronopus, Spergularia marina) and provide data on other weeds that have spread along major roads. Three species found (Desmazeria marina, Puccinellia distans subsp. distans, Parapholis incurva) are included in the Croatian Red List
EGF regulates tyrosine phosphorylation and membrane-translocation of the scaffold protein Tks5
Background: Tks5/FISH is a scaffold protein comprising of five SH3 domains and one PX domain. Tks5 is a substrate of the tyrosine kinase Src and is required for the organization of podosomes/invadopodia implicated in invasion of tumor cells. Recent data have suggested that a close homologue of Tks5, Tks4, is implicated in the EGF signaling.Results: Here, we report that Tks5 is a component of the EGF signaling pathway. In EGF-treated cells, Tks5 is tyrosine phosphorylated within minutes and the level of phosphorylation is sustained for at least 2 hours. Using specific kinase inhibitors, we demonstrate that tyrosine phosphorylation of Tks5 is catalyzed by Src tyrosine kinase. We show that treatment of cells with EGF results in plasma membrane translocation of Tks5. In addition, treatment of cells with LY294002, an inhibitor of PI 3-kinase, or mutation of the PX domain reduces tyrosine phosphorylation and membrane translocation of Tks5.Conclusions: Our results identify Tks5 as a novel component of the EGF signaling pathway. © 2013 Fekete et al.; licensee BioMed Central Ltd
Change of peroxidase enzyme activities in annual cuttings during rooting
The peroxidase enzyme (POD) activities (U/mg protein) were measured by spectrophotometric method in different organs of some annual ornamental plant cuttings during rooting period. The examined species were Lantana camara L. "Schneewittchen", Lantana camara L "Prof. Raoux", Heliotropium arborescens L. an d Helichrysum stoechas (L.) Moench. Rooting of cuttings was more than 90% at all species. The POD enzyme activities increased from the top towards the base of cuttings at all species and in all measuring dates. The highest POD activities were in the base measured one week after cutting, these values decreased in connection with the root formation in all cases. In the case of Helichrysum stoechas the rooting took much longer time while it was shown in the ten times lower POD enzyme activities in all measuring dates
Complex formation of EphB1/Nck/Caskin1 leads to tyrosine phosphorylation and structural changes of the Caskin1 SH3 domain.
Scaffold proteins have an important role in the regulation of signal propagation. These proteins do
not possess any enzymatic activity but can contribute to the formation of multiprotein complexes. Although
scaffold proteins are present in all cell types, the nervous system contains them in the largest amount. Caskin
proteins are typically present in neuronal cells, particularly, in the synapses. However, the signaling mechanisms by which Caskin proteins are regulated are largely unknown.
Here we demonstrate that EphB1 receptor tyrosine kinase can recruit Caskin1 through the adaptor protein
Nck. Upon activation of the receptor kinase, the SH2 domain of Nck binds to one of its tyrosine residues, while Nck
SH3 domains interact with the proline-rich domain of Caskin1. Complex formation of the receptor, adaptor and
scaffold proteins results in the tyrosine phosphorylation of Caskin1 on its SH3 domain. The phosphorylation sites
were identified by mass-spectrometry as tyrosines 296 and 336. To reveal the structural consequence of this
phosphorylation, CD spectroscopy was performed. This measurement suggests that upon tyrosine phosphorylation
the structure of the Caskin1 SH3 domain changes significantly.
Taken together, we propose that the scaffold protein Caskin1 can form a complex with the EphB1
tyrosine kinase via the Nck protein as a linker. Complex formation results in tyrosine phosphorylation of the Caskin1
SH3 domain. Although we were not able to identify any physiological partner of the SH3 domain so far, we could
demonstrate that phosphorylation on conserved tyrosine residues results in marked changes in the structure of the
SH3 domain
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