Search results for "Cyclin"
showing 10 items of 1021 documents
Legacy effects of contrasting water and N-availability patterns on plantmicrobial response to rewetting
2019
National audience; Introduction. Shifts in the frequency and magnitude of rain events (precipitation regime) associated with climate change may affect plant morphological and physiological strategies as well as soil microbial activity.Objectives. The objective of this study was to determine i) how precipitation history shapes the response dynamics of soil bacterial and fungal communities to rewetting, as well as plant-microbial competition for N, and ii) how the N status of the system may modulate the effect of precipitation regime.Materials & methods. The legacy effects of 12 weeks of contrasting precipitation (frequent or infrequent watering, equal total water input) and N inputs was asse…
Soil carbon dynamics and nutrient cycling
2015
Chapitre 7 Section 2 SPE EcolDur; The quantity of organic carbon in soil and the quantity and type of organic inputs have profound impacts on the dynamics of nutrients. Soil organic matter itself represents a large reservoir of nutrients that are released gradually through the action of soil fauna and microorganisms: this is especially important for the supply of N, P and S to plants, whether agricultural crops or natural vegetation. Organic matter also modifies the behaviour and availability of nutrients through a range of mechanisms including increasing the cation exchange capacity of soil, thus leading to greater retention of positively charged nutrient ions such as Ca, Mg, K, Fe, Zn and…
Nitrogen cycling microbial communities: from diversity to interactions and functions
2019
Soil microorganisms form one of the largest biodiversity reservoirs on earth. They also play essential roles in ecosystem functions such as biogeochemical cycling. However, the importance of microbial community diversity and composition for ecosystem functioning is still debated. A sound understanding of the ecological processes governing the assembly of these communities in the environment is also missing. In this talk, I will give examples of how we addressed these knowledge gaps using nitrogen cycling microorganisms as model functional guilds. Nitrogen is the most limiting nutrient for crop production in agriculture. The nitrogen cycle is also one which was pushed by human activities out…
Caractérisation phénotypique de souches de Bradyrhizobium isolées de sols contanimés ou non par des antibiotiques
2014
Rapport de Stage de Master 1 EA MERS CT3
Effets d’apports répétés d’antibiotiques au sol sur la biodiversité des populations de Bradyrhizobium japonicum, bactérie fixatrice d’azote nodulant …
2014
EA MERS CT3; DEUG
Effets d’apports répétés d’antibiotiques au sol sur la biodiversité des populations de Bradyrhizobium japonicum, bactérie fixatrice d’azote nodulant …
2013
Rapport de stage d'IUT EA MERS CT3; Licence
Effets d’apports répétés d’antibiotiques au sol sur la biodiversité des populations de Bradyrhizobium japonicum, bactérie fixatrice d’azote nodulant …
2013
Rapport de Stage de Master 1 EA MERS CT3
Showing the Invisible: The Economic Cycle of Stone Tools
2023
This contribution takes place in a broader theme, that of “the invisible economy of recyclable materials”. It aims to illustrate the phenomena of recovery of materials from lithic tools and their consequences. The classification of tools by material, although classic, is not relevant from a technical point of view. The material of a tool, in particular its mechanical properties, is to be taken into consideration in its technical analysis, but it cannot constitute a determining criterion in a classification system. Function should come first, as most functional categories use multiple materials. The most striking example, if one can say so, is that of the striking supports, where one finds, …
Pierres et carrières : réflexions autour de différentes stratégies d’approvisionnement sur les chantiers bourguignons médiévaux
2021
In this paper, we want to discuss the complexity of the mechanisms of medieval building stone supplying based on a diachronically and multidisciplinary inquiry on several Cistercian and ducal study cases. The first results enlighten the constraint caused by land property that limits the builders to a supplying network shaped by domain and law. Thanks to the growing vitality of trade and the arrival of independent stone providers, criteria of selection gradually focus on stone itself. Both global and individual strategies evolve then, reinventing the networks of stone providing and the markets.
Public employees in South-Western Norway using an e-bike or a regular bike for commuting – A cross-sectional comparison on sociodemographic factors, …
2019
Large-scale analyses on the travel behavior of e-bikes are scarce, and current knowledge regarding who the e-bike owners are is inconsistent. Also, commuters represent a relevant user group with an unexploited potential. Therefore, the purpose of the present study was to examine (i) associations between type of bike (e-bike vs. regular bike) with place of residence (county), sociodemographic variables (age, sex, educational level, income and ethnicity) and habitual physical activity level, and (ii) if public employees possessing an e-bike cycle more often and longer distances to work. A cross-sectional survey was conducted in 2017 among 1977 (5.2% of eligible subjects) public employees in S…