A novel open-source cultivation system helps establish the first full cycle chemosynthetic symbiosis model system involving the giant ciliate .

Symbiotic interactions drive species evolution, with nutritional symbioses playing vital roles across ecosystems. Chemosynthetic symbioses are globally distributed and ecologically significant, yet the lack of model systems has hindered research progress. The giant ciliate and its sulfur-oxidizing symbionts represent the only known chemosynthetic symbiosis with a short life span that has been transiently cultivated in the laboratory.

A case-control study of peripapillary microvascular structure by OCT-angiography in non-arteritic ischaemic optic neuropathy at early and resolutive stages.

Objectives: To analyse peripapillary and papillary superficial microvascularization using OCT-angiography (OCT-A) in patients with non-arteritic ischaemic optic neuropathy (NAION) at the acute and resolutive stages.

Methods: This retrospective case-control study conducted between October 2018 and November 2019 included 23 NAION subjects at the acute stage (onset <1 month) and 20 patients at the resolutive stage (onset >3 months). NAION and contralateral eyes were compared to control eyes of patients (n = 50) matched 1:1 for refractive error, sex, age, systemic hypertension, diabetes, and sleep apnoea syndrome.

Thiovulum sp. strain imperiosus: the largest free-living Epsilonproteobacteraeota strain lives in a marine mangrove environment.

A large (47.75 ± 3.56 µm in diameter) bacterial strain forming white veils is described from a marine mangrove ecosystem.

First description of a new uncultured purple sulfur bacterium colonizing marine mangrove sediment in the Caribbean: Halochromatium-like PSB from Guadeloupe.

Here, we report the first description of a marine purple sulfur bacterium (PSB) from sulfide-rich sediments of a marine mangrove in the Caribbean. TEM shows that this new isolate contains intracytoplasmic vesicular membrane systems (containing bacteriochlorophyll a) and larger internal sulfur granules, confirmed by EDXS analyses performed using ESEM. The sulfur distribution and mapping obtained for this PSB strain has allowed us to conclude that elemental sulfur is formed as an intermediate oxidation product and stored intracellularly.

Development of a protocol to measure iron-55 in solid matrices in the environment.

The development of metrology of iron-55 in low-level radioactivity in environmental solid matrices was realised for conducting radioecological studies. A protocol was developed based on the adaptation of existing methods for the purification of iron-55 with selective chromatographic resin, which was then measured with liquid scintillation. The loss attached treatment chemical steps were quantified with elemental iron by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES).

Comparative modifications in bacterial gill-endosymbiotic populations of the two bivalves Codakia orbiculata and Lucina pensylvanica during bacterial loss and reacquisition.

Until now, the culture of sulphur-oxidizing bacterial symbionts associated with marine invertebrates remains impossible. Therefore, few studies focused on symbiont's physiology under stress conditions. In this study, we carried out a comparative experiment based on two different species of lucinid bivalves (Codakia orbiculata and Lucina pensylvanica) under comparable stress factors.

Podocyturia as a diagnostic marker for preeclampsia amongst high-risk pregnant patients.

Urinary podocyte (podocyturia) has been studied as a diagnostic marker for preeclampsia. We sought to validate its use in preeclampsia and in differentiating it from other high risk pregnancy states. We studied an obstetric population at high risk to develop preeclampsia (study group) and uncomplicated pregnancies (control group) by analyzing their urine sediment for podocytes within 24 hours of delivery.

[Renal vein thrombosis and constitutional protein S deficiency].

Venous and arterial thrombosis due to a constitutional protein S deficiency is well-known. We report the case of a 36 year-old patient admitted to hospital in 1991 for primary renal vein thrombosis due to a constitutional protein S deficiency of type I. The diagnosis was made by CT scan and angiography.