89 research outputs found
Norway spruce (Picea abies): Bayesian analysis of the relationship between temperature and bud burst
Temperatureâsensitive biochemical Oâfractionation and humidityâdependent attenuation factor are needed to predict ÎŽ O of cellulose from leaf water in a grassland ecosystem
We explore here our mechanistic understanding of the environmental and physiological processes that determine the oxygen isotope composition of leaf cellulose (ÎŽO) in a droughtâprone, temperate grassland ecosystem.
A new allocationâandâgrowth model was designed and added to an Oâenabled soilâvegetationâatmosphere transfer model (MuSICA) to predict seasonal (AprilâOctober) and multiâannual (2007â2012) variation of ÎŽO and Oâenrichment of leaf cellulose (ÎO) based on the BarbourâFarquhar model.
Modelled ÎŽO agreed best with observations when integrated over c. 400 growingâdegreeâdays, similar to the average leaf lifespan observed at the site. Over the integration time, air temperature ranged from 7 to 22°C and midday relative humidity from 47 to 73%. Model agreement with observations of ÎŽO (R = 0.57) and ÎO (R = 0.74), and their negative relationship with canopy conductance, was improved significantly when both the biochemical Oâfractionation between water and substrate for cellulose synthesis (Δ, range 26â30â°) was temperatureâsensitive, as previously reported for aquatic plants and heterotrophically grown wheat seedlings, and the proportion of oxygen in cellulose reflecting leaf water Oâenrichment (1 â pp, range 0.23â0.63) was dependent on air relative humidity, as observed in independent controlled experiments with grasses.
Understanding physiological information in ΎO requires quantitative knowledge of climatic effects on pp and Δ
The 18O ecohydrology of a grassland ecosystem - predictions and observations
This research has been supported by the Deutsche Forschungsgemeinschaft (grant no. SCHN 557/9-1), the Agence Nationale de la Recherche (grant no. ANR-13-BS06-0005), and the European Commission (grant no. SOLCA 338264). This work was supported by the German Research Foundation (DFG) and the Technical University of Munich (TUM) in the framework of the Open Access Publishing Program.Peer reviewedPublisher PD
Integrating mental imagery and fascial tissue: A conceptualization for research into movement and cognition
Mental imagery (MI) research has mainly focused to date on mechanisms of effect and performance gains associated with muscle and neural tissues. MI's potential to affect fascia has rarely been considered. This paper conceptualizes ways in which MI might mutually interact with fascial tissue to support performance and cognitive functions. Such ways acknowledge, among others, MI's positive effect on proprioception, body schema, and pain. Drawing on cellular, physiological, and functional similarities and associations between muscle and fascial tissues, we propose that MI has the potential to affect and be affected by fascial tissue. We suggest that fascia-targeted MI (fascial mental imagery; FMI) can therefore be a useful approach for scientific as well as clinical purposes. We use the example of fascial dynamic neuro-cognitive imagery (FDNI) as a codified FMI method available for scientific and therapeutic explorations into rehabilitation and prevention of fascia-related disabling conditions
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