LE STUDIUM Multidisciplinary Journal

Helminth infections represent a major health threat for both humans and animals. In the latter they occur at often very high prevalences and on a global scale. Due to a near complete lack of immuno-prophylactic measures the metaphylactic use of chemotherapeutics i.e. the anthelmintics is the corner stone of worm control since decades. This has resulted in widespread anthelmintic resistance in a range of helminth species. Particularly the gastrointestinal nematodes and amongst them also so called roundworms or ascarids have evolved resistance. This results in an increasing clinical issue as like in horses the Parascaris spp. as well as in pigs or humans the Ascarais spp. often cause considerable clinical symptoms. To improve the sustainable use and provide solutions for the resistance problem it is important to understand the molecular mechanisms of anthelmintic resistance. In the present project the P-glycoprotein (Pgp) based drug efflux as a non-drug target associated mechanism of resistance is being addressed in Parascaris. To this end, the model nematode Caenorhabditis elegans was employed and the specific role of the Pgp3 was  examined. The pharmacological profile of a Pgp3 knock out C. elegans line (VC 2338) was established using a panel of anthelmintic compounds and compared with the N2 wildtype strain. Furthermore, the Parascaris Pgp3 coding sequence was injected into the VC2338 to achieve recombinant expression under an intestinal promotor (ges1) as we have done it successfully with another Parascaris Pgp recently. Our results suggest that the Parascaris Pgp3 overexpression in C. elegans interferes with the development of the worm and ongoing investigations attempt to further elucidate the specific role of Pgp3 in the worms homoeostasis.

One of the Asteraceae family's most significant therapeutic herbs is Echinacea purpurea (L.) Moench. The plant is extremely rich in anti inflammatory and antioxidant chemicals, that can be produced effectively and sustainably by in vitro cultures, which are often enhanced by the inclusion of an elicitor in the culture media. In the present investigation, TDZ was effectively utilized to induce E. purpurea callus cultures. Additionally, different melatonin dosages were evaluated for their impact on biomass accumulation, antioxidant capability, and secondary metabolite synthesis. In callus treated with 25μM melatonin, the highest biomass accumulation, total phenolic output, and total flavonoid production were noted. At the same moderate concentration, the best DPPH radical scavenging activity and overall antioxidant capacity were also observed. A positive association was reflected between biomass and these factors. Notable inhibitory effects were seen against pancreatic lipase, alpha-glucosidase, and alpha-amylase after administration with exogenous melatonin, respectively, during the investigation of the potential of callus cultures. These results emphasized the need to look into the existing strategy in more detail in order to identify novel approaches to treating diabetes and obesity. In HPLC analysis, maximum amounts of metabolites resulted at concentrations of 25–50 μM, except amino acids that were associated with the lowest melatonin concentration. Our research showed that TDZ can be used for efficient callus induction of E. purpurea, and elicitation with melatonin may be a useful tactic for boosting biomass, phenolic compounds, flavonoids, and antioxidant capacity as well as numerous enzyme inhibitory effects.

Constitutive activation of ERK1/2 pathway drives the proliferation and survival of many cancer cell types. Therefore, the new approaches, i.e. small molecular weight compounds targeting directly hyperactivated ERK 1/2, are widely explored as anticancer compounds. Recently, new molecules based on a 1,1-dioxido-2,5-dihydrothiophen-3-yl 4-benzenesulfonate scaffold (targeting the FRS domain of ERK2) were synthesized. These new molecules, indicated as compounds 4 and 6, contain modifications of the arylamine substituent at the 4-position of the heterocyclic scaffold. To gain insight into molecular mechanisms of their activity, the study was focused on the exploration of potential interaction of these new compounds with ERK2 by means of in silico study, i.e. molecular docking. The docking procedure was carried out within both substrate docking sites, DRS and FRS, and ATP binding sites, and by means of Molecular Operating Environment (MOE) system. The 4gt3, 
high-resolution ERK2 structure available in the Protein Data Bank (RCSB PDB) was chosen for this purpose. The analysis indicated that both compounds 4 and 6 bound with similar efficiency within both substrate docking sites, DRS and FRS, but not in the ATP binding site.

The report presents the main issues, experimental details and first results of the project “Attitudes and language use of international students during their stay in Orléans: the example of discourse markers in L2” (ESLO-L2), realized at the host laboratory “Laboratoire Ligérien de Linguistique” (LLL) between March and July 2023. The aim of the project was to apply the methodology of the corpus of oral French “Enquête SocioLinguistique à Orléans” (ESLO), conceived as a “city’s sound portrait” to the group of foreign exchange students at the University of Orléans. The research interest of the project was aimed at the questions of how the students’ perception of the city, its inhabitants and the French language changes during the first 5-6 months of their stay in Orléans and how the students’ language use in oral interaction develops during this period. The latter will be examined through the example of discourse marker use.

Insects are successful largely because they are highly efficient at optimizing nutrients for reproduction. To understand this efficiency, we have used the stable isotope tracer-tracee-based technique mass isotopomer distribution analysis (MIDA) to follow metabolic allocation in insects in vivo. Based largely on application of these techniques, we had three aims during the fellowship:  
a)    To adapt MIDA to study allocation of carbohydrates acquired during host feeding by the parasitoid Eupelmus vuiletti to fat production.
b)    To study sex pheromone storage in a moth (Bombyx mori).
c)    To write a significant, high impact review on insect physiology.
We successfully adapted MIDA to study fat acquisition in E. vuiletti. Essentially, females allowed to feed on a glucose drop, turned over their hemolymph trehalose substantially (ca. 30-40%). However, very little of this acquired sugar was converted to fat. Moreover, isotopic enrichment of fat was substantially less than that of the trehalose, indicating that other (non-labeled) sources of precursor are used for this fat synthesis. This supports the finding that parasitoids can synthesize fat, but only in very small amounts in comparison to their carbohydrate acquisition. These techniques were transferred to staff and students at IRBI.
Problems with supply of insects meant that we could not fully study sex pheromone storag in B. mori. However, we were able to demonstrate that females, when synthesizing pheromone, stored most pheromone on the gland cuticular surface, rather than intracellularly, thereby facilitating emission of pheromone.  
Finally, we wrote and submitted a proposal for a review on insect exocrine glands for the highly prestigious Annual Review of Entomology (2022 IF = 23.8). We were notified of the success of our proposal in December 2022. Thereafter , a considerable portion of the visit was dedicated to researching, synthesizing, and writing this review. The manuscript will be submitted in January 2024 and, hopefully, published in January 2025.
 

The accelerated digital development characterizing today's society multiplies and blurs educational contexts. In this regard, it becomes necessary to create learning spaces supported by ICT (Information and Communication Technology) that integrate formal and informal contexts, where each person decides what, how, and when to learn. From this perspective, the proposal is to create learning ecologies with learning resources based on a content curation process that retrieves, develops, and shares educational digital content according to the interests and informational needs of the professors. This study aims to analyze the learning resources that make up the learning ecologies available to professors at the University of Orléans. The presentation includes the theoretical foundations underpinning the research and its main results from the qualitative perspective of educational research.

This paper presents a security architecture for the Internet of Medical Things (IoMT), striving to protect sensitive data stored, processed, and transferred in such a system. It is based on a 5-layer architecture for IoMT systems and defines security mechanisms and techniques that can be employed on the different layers in order to protect medical data in its whole lifecycle adequately. Additionally, we also discuss the most common security requirements and attacks from literature which served as the basis for the security architecture. The former can be implemented on various heterogenous IoMT devices and environments.

The Earth’s radiation environment couples to the upper atmosphere through precipitation of energetic electrons in high-latitude regions. This precipitation is driven by electromagnetic waves in the plasma environment around the Earth, including waves generated by lightning discharges. We use data from the DEMETER mission, built and operated by LPC2E between 2004-2010, to better understand the propagation characteristics of these lightning-generated signals and their effects on the radiation environment. Further, we use lessons and heritage from the DEMETER mission to inform design decisions and data analysis techniques for the upcoming CANVAS mission, a collaboration between the University of Colorado Boulder and LPC2E. CANVAS is expected to launch in mid-2024.

The use of residual biomass from forest harvesting for energy production is viewed as a means to reduce fossil-fuel consumption. However, the impact of wood energy harvesting on soil and future site productivity remains a major concern. During this fellowship, we analysed why forest biomass harvesting of whole trees in Quebec reduced soil organic carbon (C) and total nitrogen (N) reserves in certain sites. We also estimated soil C and N labile and stable fractions in the Centre-Val de Loire region in France, and its relationship with current soil sensitivity indices to residual biomass harvesting. This research shed new insights on soil properties that could explain their sensitivity or resilience to forest biomass harvesting. We believe that this fellowship made a significant contribution to scientific knowledge and address pressing societal challenges.

In this project, we investigated the pharmacological effects of steroid hormones on gonadotropin receptors, FSHR and LHR, transiently expressed in HEK293 cells. For this, we used BRET technology to assess receptor-G protein activation as well as -arrestin recruitment upon treatment of cells with gonadotropins, FSH or hCG, in the absence or presence of increasing doses of 3 different steroid hormones (SH), estradiol, testosterone, and progesterone. We observed that SH to different extent significantly modulate FSH/hCG-promoted BRET signals between receptor/G protein as well as receptor/-arrestin pairs. Tis indicate an allosteric mode of action of SH on FSHR and LHR. Moreover, we observed differential effects of SH on receptor/-arrestin pair when comparing FSHR and LHR by decreasing (for FSHR) or increasing (for LHR) the BRET responses. Interestingly, we also observed significant BRET increase with vasopressin (V2R) and angiotensin II (AT1R) receptors. This suggests a more general feature of SH allosterically targeting GPCRs with potential implications in physiology and pathophysiology.