Dynamique des communautes bacteriennes d'une eau lagunaire enrichie en azote

In Arcachon lagoon water, bacterial populations were defined by direct counts, plate counts, structure and diversity of communities, and AMP. ADP and ATP were also measured in two opposite ecological situations: autumn (temperature still high), and winter (low temperature). We used batches of 6 and 50-l in which the sea water was enriched with ammonium chlorid or amino-acids to about 500 mu Atg N.1 super(-1). The experiment lasted 24 hrs. with a sampling interval of 3 hrs, during the first 12 hrs., and a final sample at 24 hrs. The fall commmunities reacted quickly (6 hrs) and responses to organic nitrogen were more pronounced. The community structure showed immature states (zymogenous bacteria responding easily to stress. On the contrary, no response was observed during winter which may mean that the lag phase lasted longer than 24 hrs. Community structure indicated a mature state (autochtonous bacteria)

Pharmacosynthetic Deconstruction of Sleep-Wake Circuits in the Brain.

Over the past decade, basic sleep research investigating the circuitry controlling sleep and wakefulness has been boosted by pharmacosynthetic approaches, including chemogenetic techniques using designed receptors exclusively activated by designer drugs (DREADD). DREADD offers a series of tools that selectively control neuronal activity as a way to probe causal relationship between neuronal sub-populations and the regulation of the sleep-wake cycle. Following the path opened by optogenetics, DREADD tools applied to discrete neuronal sub-populations in numerous brain areas quickly made their contribution to the discovery and the expansion of our understanding of critical brain structures involved in a wide variety of behaviors and in the control of vigilance state architecture.info:eu-repo/semantics/publishe