Phytoplanktonic species in the haloalkaline Lake Dziani Dzaha select their archaeal microbiome.

Microorganisms are key contributors of aquatic biogeochemical cycles but their microscale ecology remains largely unexplored, especially interactions occurring between phytoplankton and microorganisms in the phycosphere, that is the region immediately surrounding phytoplankton cells. The current study aimed to provide evidence of the phycosphere taking advantage of a unique hypersaline, hyperalkaline ecosystem, Lake Dziani Dzaha (Mayotte), where two phytoplanktonic species permanently co-dominate: a cyanobacterium, Arthrospira fusiformis, and a green microalga, Picocystis salinarum. To assay phycospheric microbial diversity from in situ sampling, we set up a flow cytometry cell-sorting methodology for both phytoplanktonic populations, coupled with metabarcoding and comparative microbiome diversity.

Arterial distensibility and circadian blood pressure variability.

OBJECTIVE: To analyse the relationships between arterial distensibility and blood pressure level and its circadian variability assessed by non-invasive ambulatory blood pressure monitoring. DESIGN: One hundred and six patients (69 men, 37 women; aged 20-72 years) without any cardiovascular complication or treatment underwent 24 h ambulatory blood pressure monitoring. Aortic distensibility was evaluated by carotid-femoral artery pulse-wave velocity measurements performed with a validated automatic device (Complior).

Fortuitous diagnosis of the association of hemoglobin J-Broussais with beta + thalassemia.

The authors report a case, not described so far in literature, of an association of HbJ-Broussais [alpha (90 (PG2) lys-->asn beta 2] with beta + thalassemia in a young girl born of Italian father and Breton mother. This association is clinically silent. Biochemistry revealed, besides HbA, the presence of HbJ-Broussais in the proportion of 19.