754 results match your criteria: "centre de maternité et de néonatologie de Tunis[Affiliation]"

Background: Cutaneous Leishmaniases (CL), highly endemic in Africa and Mediterranean region, are caused by different Leishmania parasite species. Accurate species identification is crucial for effective diagnosis, treatment, and control of these diseases, but traditionally relies on DNA-based methods. High Resolution Melting analysis PCR (HRM PCR) provides rapid results and precise differentiation based on nucleotide variations.

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Nonischemic Cardiac Manifestations in VEXAS Syndrome.

JAMA Netw Open

December 2024

Department of Internal Medicine, CEREMAIA, Sorbonne Université, Hôpital Tenon, Assistance Publique-Hôpitaux Paris, Paris, France.

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Stable fluorimetric detection of histamine using o-phthaldialdehyde derivatizing agent and surfactants in water-acetonitrile mixed solvent.

Spectrochim Acta A Mol Biomol Spectrosc

November 2024

Laboratoire de Recherche: Caractérisations, Applications et Modélisation de Matériaux, Université de Tunis El Manar, Faculté des Sciences de Tunis, Campus universitaire El Manar, Tunisia. Electronic address:

A new analytical method for the rapid detection of histamine (HA) in beverages using fluorescence detection has been devised. It is primarily based on the use of o-phthalaldehyde (OPA) as a derivatizing agent. This unstable complex has been efficiently stabilized by addition of surfactants.

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Optimization of thermophysical properties (TPPs) of MXene-based nanofluids is essential to increase the performance of hybrid solar photovoltaic and thermal (PV/T) systems. This study proposes a hybrid approach to optimize the TPPs of MXene-based Ionanofluids. The input variables are the MXene mass fraction (MF) and temperature.

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Article Synopsis
  • - North Africa has both fat-tailed and thin-tailed sheep breeds; the fat-tailed ones are better suited to dry environments.
  • - A study analyzed genetic data from 462 sheep across 22 breeds to identify genomic regions under different selective pressures related to these traits.
  • - Seven candidate regions on chromosomes, particularly around the BMP2 gene, were found to be under strong selection, linked to adaptations like fat storage and tolerance to harsh conditions.
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  • - Type 2 diabetes mellitus (T2DM) is a widespread health problem linked to chronic inflammation, which worsens the disease and leads to complications like cardiovascular issues.
  • - A study involving 522 diabetes patients compared the effects of insulin and metformin on inflammatory markers and complications, revealing that insulin users had significantly higher rates of microvascular problems like retinopathy and neuropathy compared to those on metformin.
  • - Results showed that insulin treatment lowered certain inflammatory markers (TNF-α and IL-6) but increased adhesion molecules (sE-selectin and sP-selectin), while metformin showed different inflammatory profiles, suggesting that treatment choices could influence disease progression differently.
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Structure-Function Relationship of a Novel MTX-like Peptide (MTX1) Isolated and Characterized from the Venom of the Scorpion .

Int J Mol Sci

September 2024

Laboratory of Venoms and Therapeutic Biomolecules, Pasteur Institute of Tunis, University of Tunis El Manar, 13 Place Pasteur, BP74, Tunis 1002, Tunisia.

Maurotoxin (MTX) is a 34-residue peptide from venom. It is reticulated by four disulfide bridges with a unique arrangement compared to other scorpion toxins that target potassium (K) channels. Structure-activity relationship studies have not been well performed for this toxin family.

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Article Synopsis
  • The study explored the link between anti-prothrombin IgM and IgG antibodies and recurrent pregnancy loss (RPL) among 207 Lebanese women with RPL compared to 179 controls.
  • Results showed that women with RPL had significantly higher levels of these antibodies, indicating they are associated with an increased risk of RPL.
  • The findings support the need for screening for anti-prothrombin antibodies in women experiencing unexplained RPL to help improve treatment and management strategies.
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Venous thromboembolic disease (VTE) in burn patients is an under-diagnosed and potentially serious complication. Its incidence varies according to studies performed. This retrospective and descriptive study conducted in an intensive burn care department in Tunisia over a period of 22 months (January 1, 2021 to October 30, 2022) included 24 patients who presented a thromboembolic complication among a total of 785 admissions (incidence of 3%): pulmonary embolism in 15 cases and deep venous thrombosis (DVT) in 9 cases.

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Enhancement of the Piezocatalytic Response of La-Doped BiFeO Nanoparticles by Defects Synergy.

Small

December 2024

CentraleSupélec, Laboratoire Structures, Propriétés et Modélisation des Solides, Université Paris-Saclay, UMR CNRS 8580, Gif-sur-Yvette, 91190, France.

Because of their intrinsic polarization and related properties, ferroelectrics attract significant attention to address energy transformation and environmental protection. Here, by using trivalent-ion-lanthanum doping of BiFeO nanoparticles (NPs), it is shown that defects and piezoelectric potential are synergized to achieve a high piezocatalytic effect for decomposing the model Rhodamine B (RhB) pollutant, reaching a record-high piezocatalytic rate of 21 360 L mol min (i.e.

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Early bacteremia following allogeneic hematopoietic stem cell transplantation without antibiotic prophylaxis: epidemiology and antimicrobial resistance.

Hematol Transfus Cell Ther

December 2024

Centre National de Greffe de Moelle Osseuse de Tunis. Service d'Hématologie et de Greffe, Tunis, Tunisia; Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisia.

Article Synopsis
  • - The study analyzed data from 245 patients who underwent allogeneic hematopoietic stem cell transplantation between 2016 and 2021, focusing on early bacteremia, defined as blood infections occurring within the first 100 days post-transplant.
  • - Out of 40 cases of early bacteremia found, the majority were caused by gram-negative bacteria (62.5%), specifically Klebsiella and Pseudomonas species, with a high incidence (72.5%) occurring within the first 30 days post-transplant.
  • - Key risk factors for developing bacteremia included using bone marrow as the graft source and cytomegalovirus reactivation, with a notable increase in multidrug-resistant strains observed among the
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Interspecific introgression is a potentially important source of novel variation of adaptive significance. Although multiple cases of adaptive introgression are well documented, broader generalizations about its targets and mechanisms are lacking. Multiallelic balancing selection, particularly when acting through rare allele advantage, is an evolutionary mechanism expected to favor adaptive introgression.

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  • A study on European FMF patients found that 20% experienced a diagnostic delay of over 10 years, with affected individuals being significantly older.
  • Women were more likely to have this diagnostic delay compared to men, and specific symptoms like erysipelas-like erythema were more prevalent in delayed diagnosis cases.
  • Delayed-diagnosis patients also had higher occurrences of AA amyloidosis and were more frequently treated with biotherapy, indicating more severe disease consequences.
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Reversion of neurovirulent mutations, recombination and high intra-host diversity in vaccine-derived poliovirus excreted by patients with primary immune deficiency.

J Med Virol

September 2024

Laboratory of Clinical Virology, WHO Regional Reference Laboratory for Poliomyelitis and Measles for the EMR, Institut Pasteur de Tunis, University of Tunis El Manar, Tunis, Tunisia.

Article Synopsis
  • * A study examined the genetic evolution of PV genomes from MHC class II-deficient PID patients, using stool samples to detect the virus through several advanced techniques, including full genome sequencing.
  • * Results indicated that while one patient cleared the virus with few mutations, two others showed significant genetic diversity in the virus, leading to severe outcomes and potential paralysis, highlighting the need for further research on the implications of intra-host diversity in PV evolution.
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Antiviral responses induced by double-stranded RNA (dsRNA) include RNA interference (RNAi) and pattern-triggered immunity (PTI), but their relative contributions to antiviral defence are not well understood. We aimed at testing the impact of exogenous applied dsRNA on both layers of defence against potato virus X expressing GFP (PVX-GFP) in Nicotiana benthamiana. Co-inoculation of PVX-GFP with either sequence-specific (RNAi) or nonspecific dsRNA (PTI) showed that nonspecific dsRNA reduced virus accumulation in both inoculated and systemic leaves.

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Article Synopsis
  • Actinomycosis is a rare bacterial infection caused by Actinomyces species, particularly Actinomyces israeli, and can present as a solid mass in the colon, simulating cancer.
  • A 68-year-old man with multiple health issues was diagnosed with an obstructive mass in his sigmoid colon after presenting with abdominal pain; surgery confirmed the infection and involved a total colectomy.
  • Although abdominal actinomycosis can confuse doctors and lead to unnecessary surgeries, it's usually treatable with antibiotics, and complicated cases may require both surgery and continued antibiotic treatment for complete recovery.
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Article Synopsis
  • Bacterial exopolysaccharides (EPS) produced by a newly discovered strain (NEAU-3TGS) from an iron mine in Tunisia show potential in removing heavy metals from contaminated environments, particularly iron and lead.
  • Genomic analysis indicates NEAU-3TGS is likely a new bacterial species with a diverse genome structure and unique metabolic capabilities related to iron absorption.
  • Structural and chemical analyses of the EPS reveal key components, while heavy metal absorption experiments determine optimal conditions for maximum metal uptake, identifying specific binding interactions with siderophores in molecular modeling studies.
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A Comparative Genetic Analysis of in Cape Verde.

Plants (Basel)

August 2024

Instituto Universitario de Estudios Ambientales y Recursos Naturales (IUNAT), Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain.

The Cape Verde palm tree, , holds significant ecological and cultural importance within the Cape Verde archipelago. However, its genetic distinctiveness has been questioned due to its close relationship and morphological similarity to the date palm (). In this study, we used an expanded sample set, 18 simple sequence repeat (SSR) markers, and a plastid minisatellite to characterize in Cape Verde and investigate its relationship with other species.

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Effect of gamma irradiation on the proteogenome of cold-acclimated Kocuria rhizophila PT10.

Res Microbiol

November 2024

Laboratory "Energy and Matter for Development of Nuclear Sciences" (LR16CNSTN02), National Center for Nuclear Sciences and Technology (CNSTN), Sidi Thabet Technopark, 2020, Tunisia; Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia. Electronic address:

The effects of ionizing radiation (IR) on the protein dynamics of cold-stressed cells of a radioresistant actinobacterium, Kocuria rhizophila PT10, isolated from the rhizosphere of the desert plant Panicum turgidum were investigated using a shotgun methodology based on nanoflow liquid chromatography coupled to tandem mass spectrometry. Overall, 1487 proteins were certified, and their abundances were compared between the irradiated condition and control. IR of cold-acclimated PT10 triggered the over-abundance of proteins involved in (1) a strong transcriptional regulation, (2) amidation of peptidoglycan and preservation of cell envelope integrity, (3) detoxification of reactive electrophiles and regulation of the redox status of proteins, (4) base excision repair and prevention of mutagenesis and (5) the tricarboxylic acid (TCA) cycle and production of fatty acids.

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Article Synopsis
  • A series of 61 thiazolidine-2,4-dione compounds with a styryl group was synthesized, analyzed for structure, and tested for their effectiveness against the kinetoplastid parasite and HepG2 cells.
  • Some compounds, particularly those with a nitro group, showed promising antileishmanial activity, with one compound demonstrating a low EC of 7 µM and low toxicity in human cell lines.
  • Mechanistically, this effective compound is identified as a prodrug activated by nitroreductase 1, producing cytotoxic metabolites that damage the parasite, while maintaining favorable lipophilicity and water solubility.
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New Series of Hydrogen-Bonded Liquid Crystal with High Birefringence and Conductivity.

Molecules

July 2024

Unité Matériaux et Transformations (UMET), UMR 8207-CNRS, University Lille, CNRS, INRAE, Centrale Lille, F-59000 Lille, France.

Liquid crystals with high dielectric anisotropy, low operational thresholds, and significant birefringence (Δ) represent a key focus in soft matter research. This work introduces a novel series of hydrogen-bonded liquid crystals (HBLCs) derived from 4-n-alkoxybenzoic, 4-alkoxy-3-fluorobenzoic derivatives (nOBAF), 4-alkoxy-2,3-fluorobenzoic derivatives (nOBAFF), and 2-fluoro-4-nitrobenzoic acid. The HBLCs were characterized using Fourier transform infrared spectroscopy, and their thermal behavior was evaluated via differential scanning calorimetry.

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Twisted MoSe Homobilayer Behaving as a .

Nano Lett

August 2024

Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.

Heterostructures (HSs) formed by the transition-metal dichalcogenide materials have shown great promise in next-generation (opto)electronic applications. An artificially twisted HS allows us to manipulate the optical and electronic properties. In this work, we introduce the understanding of the energy transfer (ET) process governed by the dipolar interaction in a twisted molybdenum diselenide (MoSe) homobilayer any charge-blocking interlayer.

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Background: Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative treatment for acquired aplastic anemia (acquired AA) in young patients. The objective of the study was to compare patient outcomes after Cyclophosphamide and horse antithymocyte globulin (Cy-hATG) versus Fludarabine-cyclophosphamide and rabbit ATG (Flu-Cy-rATG) as part of conditioning regimen in allo-HSCT for acquired AA.

Research Design And Methods: Descriptive retrospective study conducted on patients with acquired AA who received allo-HSCT from HLA-matched sibling donors between January 2008 and August 2022 after conditioning regimen with Cy-hATG or Flu-Cy-rATG.

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