Publications by authors named "Kuhn F"

Background: The incidence of colorectal cancer (CRC) in patients who are less than 50 years old (early-onset colorectal cancer, EO-CRC) has risen markedly around the world in recent decades. Because of a lack of early detection programs for young patients, EO-CRC is often not detected until it has reached an advanced stage. In this study, we compared surgical patients with EO-CRC to those with so-called average-onset CRC (> 50 years; AO-CRC) using data from a large patient collective.

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Purpose: This study aimed to investigate sex differences in anal squamous cell carcinomas (ASCC), with a particular focus on the prognostic significance of the American Joint Committee on Cancer (AJCC) 9th edition staging system for oncological outcome.

Methods: A retrospective analysis was conducted in 188 patients with histologically confirmed ASCC who underwent definitive (chemo)radiotherapy between 2004 and 2020. Patient- and tumor-related data were collected.

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Well-defined single-atom catalysts (SACs) serve as ideal model systems for directly comparing experimental results with theoretical calculations, offering profound insights into heterogeneous catalytic processes. However, precisely designing and controllably synthesizing SACs remain challenging due to the unpredictable structure evolution of active sites and generation of embedded active sites, which may bring about steric hindrance during chemical reactions. Herein, we present the precious nonpyrolysis synthesis of Re SACs with a well-defined phenanthroline coordination supported by NiO (Re-phen/NiO).

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Background: The healthcare sector, while dedicated to improving health, paradoxically contributes significantly to global carbon emissions, accounting for approximately 4.9% of global emissions. Despite growing public concern about climate change, few studies have explored patients' awareness and attitudes toward the environmental impact of healthcare.

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Article Synopsis
  • This protocol outlines a Cochrane Review focused on the timing of vitrectomy following open-globe injuries.
  • The main goal is to compare the effects of performing the surgery early versus later on patients' visual outcomes.
  • The review aims to provide evidence that could guide clinical decisions regarding the optimal timing for vitrectomy in such cases.
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Article Synopsis
  • Intraocular foreign bodies (IOFBs) can lead to serious infections like endophthalmitis, and delays in treatment due to diagnostic testing can worsen outcomes.
  • A case involving a 16-year-old boy with an IOFB after a hammering incident showed that direct visualization of the injury led to timely surgery, preventing further infection and preserving vision.
  • The study suggests that using ultrasonography instead of CT scans for diagnosing IOFBs can facilitate faster treatment and improve patient outcomes by reducing the risk of endophthalmitis.
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Purpose: When severe retinal and corneal injury occur together, a temporary keratoprosthesis (TKP) is often a last resort to allow posterior segment visualization to enable vitreoretinal surgery, followed by a penetrating keratoplasty (PKP) which can restore corneal clarity in a single operation. We aimed to assess visual outcomes following combined PKP and vitreoretinal surgery with the use of a TKP for cases of ocular trauma.

Design: A systematic literature review was performed following PRISMA guidelines (PROSPERO registration number: CRD42023423518).

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The implementation of automation has already had a considerable impact on chemical and pharmaceutical industrial laboratories. However, academic laboratories have often been more reluctant to adopt such technology due to the high cost of commercial liquid handling systems, although, in many instances, there would be a huge potential to automate repetitive tasks, resulting in elevated productivity. We present here a detailed description of the setup, validation, and utilization of a multifunctional liquid automation (MULA) system that can be used to automate various chemical and biological tasks.

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An open-chain iron pyridine-NHC framework is expanded utilizing a benzimidazole moiety to deepen the understanding of the impact of electronic variations on iron NHC epoxidation catalysts, especially regarding the stability. The thereby newly obtained iron(II) NHC complex is characterized and employed in olefin epoxidation. It is remarkably temperature tolerant and achieves a TOF of ca.

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Article Synopsis
  • * Timely surgical intervention is crucial to reduce the risk of serious complications like endophthalmitis, which can affect visual outcomes.
  • * A review of 15 studies showed that repairs done within 24 hours significantly lowered the odds of endophthalmitis, but visual outcomes were similar regardless of repair timing.
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From previous studies, it is evident that metal-organic gold(I) complexes have antiproliferative activities. The aim of this study is not only to find new anticancer agents but also to overcome existing cytostatic resistance in cancer cells. The synthesis and medicinal evaluation of two cationic 1,3-disubstituted gold(I) bis-tetrazolylidene complexes and are reported.

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The activation of C-C bonds by transition-metal complexes is of continuing interest and acetonitrile (MeCN) has attracted attention as a cyanide source with comparatively low toxicity for organic cyanation reactions. A diiron end-on μ-η:η-CN-bridged complex was obtained from a crystallization experiment of an open-chain iron-NHC complex, namely, μ-cyanido-κC:N-bis{[(acetonitrile-κN)[3,3'-bis(pyridin-2-yl)-1,1'-(methylidene)bis(benzimidazol-2-ylidene)]iron(II)} tris(hexafluorophosphate), [Fe(CN)(CHN)(CHN)](PF). The cyanide appears to originate from the MeCN solvent by C-C bond cleavage or through carbon-hydrogen oxidation.

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Objectives: We aimed to quantify the individual risk of antimicrobial resistance among patients with community-acquired Escherichia coli urinary tract infection (UTI) according to their antibiotic exposure over the previous 18 months.

Patients And Methods: French patients were prospectively recruited in two centers in 2015-2017. Resistance of isolates to amoxicillin (AMX), amoxicillin-clavulanate (AMC), third-generation cephalosporins (3GC), trimethoprim-sulfamethoxazole (TMP-SMX), fluoroquinolones (FQ) and fosfomycin (FOS) was analysed according to previous intra-class and inter-class antibiotic exposure documented in health insurance files.

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Background And Objective: This study aimed to identify the prognostic factors regarding the visual and anatomic outcomes of eyes with posterior segment intraocular foreign body (PS-IOFB).

Patients And Methods: The medical records of 95 patients who underwent pars plana vitrectomy and PS-IOFB removal between 2004 and 2021 were retrospectively reviewed. Data on anatomical and visual outcomes, as well as preoperative, intraoperative, and postoperative variables were statistically analyzed.

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Synthesis and characterization of the first two cyclic ethylene-bridged tetradentate NHC ligands, with an unsaturated (imidazole) and saturated backbone (2-imidazoline), are described. Complexes of both ligands containing palladium(ii) have been obtained. For platinum(ii) and gold(iii), only the unsaturated tetracarbene complexes could be isolated.

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Article Synopsis
  • AIE materials are sensitive to external signals and can be used for anti-counterfeiting, but their response is limited by a lack of structural variation.
  • Researchers created several AIE-active regio-structural isomers by modifying a salicylaldehyde Schiff base with bromide and triphenylamine, enhancing their responsiveness.
  • The study demonstrates how these isomers can be used for multi-level decryption through mechanochromism and acidichromism, showcasing a method to control excited-state behavior for improved stimuli-responsive properties.
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Introduction: Crohn's disease (CD) is a chronic inflammatory bowel disease of a multifactorial pathogenesis. Recently numerous genetic variants linked to an aggressive phenotype were identified, leading to a progress in therapeutic options, resulting in a decreased necessity for surgery. Nevertheless, surgery is often inevitable.

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Single-component catalysts with integrated multiple reactive centers could work in concert to achieve enhanced activity tailored for specific catalytic reactions, but they remain underdeveloped. Herein, we report the construction of heterogeneous bimetallic porous coordination polymers (PCPs) containing both porphyrin and -heterocyclic carbene (NHC) metal sites via the coordinative assembly of the NHC functionalities. Three heterobimetallic PCPs (, and ) have been prepared to verify this facile synthetic strategy for the first time.

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Introduction: Liver (hepatic) fibrosis (LF) is characterized by impaired function and regenerative capacity of the liver and can lead to significantly increased morbidity and mortality in the context of surgical liver resection (LR). For this reason, it is crucial to identify the extent of LF preoperatively. Interleukin-6 (IL-6) is known to play a key role in the pathogenesis of LF, but its exact value as a preoperative marker is unknown.

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We have developed a visible light-induced intermolecular [2 + 2]-cycloaddition reaction between alkenes and alkynes using thioxanthone and Cu(OTf) as cocatalysts. Various quinolin-2(1)-ones, featuring diverse substituted groups, were successfully employed in this reaction, resulting in the synthesis of a series of 4,8b-dihydrocyclobuta[]quinolin-3(2a)-ones. Our methodology presents a novel synthetic approach for alkene-alkyne [2 + 2]-cycloaddition, delivering cyclobutene derivatives with exceptional regioselectivity.

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Objectives: To identify the clinical features and outcomes of early vitrectomy in patients with open globe injury (OGI) and the prognostic factors for visual outcome.

Methods: This retrospective observational case series included 390 eyes in 389 patients diagnosed with OGI receiving vitrectomy within four days after injury. Preoperative parameters included the injury types, wound locations, consequent tissue damages, initial visual acuity (VA), and ocular trauma score.

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An efficiently catalyzed synthesis of pharmaceutically relevant 1,2,3-trazoles from renewable resources is highly desirable. However, due to incompatible catalysis conditions, this endeavor remained challenging so far. Herein, a practical access protocol to 1,2,3-triazoles, starting from lignin phenolic β-O-4 with γ-OH group utilizing a vanadium-based catalyst is presented.

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