1,721,668 research outputs found
Hormonal control of the floral transition: can one catch them all?
Full text linkThe transition to flowering marks a key adaptive developmental switch in plants which impacts on their survival and fitness. Different signaling pathways control the floral transition, conveying both endogenous and environmental cues. These cues are often relayed and/or modulated by different hormones, which might confer additional developmental flexibility to the floral process in the face of varying conditions. Among the different hormonal pathways, the phytohormone gibberellic acid (GA) plays a dominant role. GA is connected with the other floral pathways through the GA-regulated DELLA proteins, acting as versatile interacting modules for different signaling proteins. In this review, I will highlight the role of DELLAs as spatial and temporal modulators of different consolidated floral pathways. Next, building on recent data, I will provide an update on some emerging themes connecting other hormone signaling cascades to flowering time control. I will finally provide examples for some established as well as potential cross-regulatory mechanisms between hormonal pathways mediated by the DELLA proteins
Impianti di terra nelle aziende agricole nelle zone di influenza della messa a terra di tralicci di linee aeree di alta tensione.
No full textNeural stem cell systems : physiological players or in vitro entities?
No full textNeural stem cells (NSCs) can be experimentally derived or induced from different sources, and the NSC systems generated so far are promising tools for basic research and biomedical applications. However, no direct and thorough comparison of their biological and molecular properties or of their physiological relevance and possible relationship to endogenous NSCs has yet been carried out. Here we review the available information on different NSC systems and compare their properties. A better understanding of these systems will be crucial to control NSC fate and functional integration following transplantation and to make NSCs suitable for regenerative efforts following injury or disease
Controlling neural stem cell division within the adult subventricular zone: an APPealing job
No full textFor years, scientists investigating amyloid precursor protein (APP) have focused on its pathogenetic role in the brains of Alzheimer's disease patients. Now, a study by Caille et al. adds new sites of action and new physiological functions for APP. They show that there are binding sites for secreted N-terminal nonamyloidogenic APP (sAPP) on epidermal growth factor (EGF)-responsive neural stem cells in the subventricular zone of the adult brain, where sAPP acts as an EGF cofactor to stimulate proliferation of these cells. This result opens the hypothesis that changes in the levels of sAPP could influence activity of the neurogenic regions of the adult brain in normal and pathological conditions
Il controllo della domanda e potenza elettrica nella utilizzazione e la programmazione del territorio
No full text
Le correnti di guasto a terra delle linee elettriche di trasmissione A.T. e loro interferenza possibile con i circuiti di messa a terra degli impianti elettrici utilizzatori alimentati in media e bassa tensione.
No full textExperience on the Magnetic and Electric detectors of the EGLE-LAZIO technology demonstrator
No full textConsiderazioni sul progetto dei forni a resistenza ad irraggiamento con resistori metallici
No full text- …
