Publications by authors named "Pfeifer R"

Understanding how to tune the properties of electroactive materials is a key parameter for their applications in energy storage systems. This work presents a comprehensive study in tailoring polyaniline (PANI) suspensions by acid-assisted polymerization method and their subsequent deposition on boron-doped diamond (BDD) supports with low/high B concentrations. The porous or densely packed morphology of PANI is successfully controlled by varying the monomer-to-initiator ratio.

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Background: Hemodynamically unstable pelvic ring fractures from high-energy trauma are critical injuries in trauma care, requiring urgent intervention and precise diagnostics. With ongoing advancements in trauma management, treatment strategies have evolved, with some techniques becoming obsolete as new ones emerge. This study aimed to evaluate changes and trends in treatment algorithms for these injuries over approximately 40 years.

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Objective: This study uses data from the Physical Therapist Centralized Application Service (PTCAS) to compare influences on application to Doctor of Physical Therapy (DPT) programs between White applicants and people of color (POC) - applicants who identified as Black, American Indian, Asian, Hispanic, or Pacific Islander.

Methods: This is a retrospective study using holistic narrative analysis. PTCAS data for the 2020 to 2021 application cycle were obtained, including essays and demographic data.

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Purpose: Polytrauma presents a devastating event with great impact on the patient's life. While we are taking great care of improving our treatment algorithms, the rehabilitation often takes place outside of our direct field of vision. Yet, adequate rehabilitation is crucial for the patients to regain their former lives.

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Nanodiamonds (NDs) containing optically active centers have gained significant relevance as the material of choice for biological, optoelectronic, and quantum applications. However, current production methods lag behind their real needs. This study introduces two CVD-based approaches for fabricating NDs with optically active silicon-vacancy (SiV) color centers: bottom-up (BU) and top-down (TD) methods.

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Article Synopsis
  • A study was conducted to improve training for trauma surgeons on managing unstable pelvic ring injuries through a realistic simulation model that focused on external fixation and screw placement.
  • Participants, including residents and consultants, completed a confidence assessment on emergency procedures before and after the simulation.
  • Results showed a significant increase in confidence levels for emergency screw placement, external fixation, and pelvic imaging following the training sessions.
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  • Pompe disease is a rare genetic disorder caused by a deficiency in the enzyme acid alpha-glucosidase, resulting in muscle weakness due to glycogen accumulation in lysosomes.
  • Enzyme replacement therapy (ERT) is the current standard treatment but has limitations, like poor muscle penetration and immune reactions against the therapy.
  • This study explores a new treatment approach using lentiviral vector-mediated gene therapy in stem cells, showing promise in reversing the disease's effects in a mouse model, along with safety assessments and insights into the treatment's mechanisms.
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Purpose: Although "tension-band wiring" is still commonly used to stabilize patellar fractures, the technique has recently been scrutinized due to biomechanical insufficiency. Consequently, the AO Foundation renamed the principle to compression cerclage wiring (CCW). Several studies propose favorable outcomes when utilizing locked plating (LP).

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Purpose: The emergency treatment of unstable pelvic ring injuries is still a challenge and requires surgical and anesthesiological resuscitation. Emergency fixation of the unstable pelvic ring with percutaneous sacroiliac (SI) screws, also known as "Rescue Screws", is an established treatment method. The aim of our study was to compare the outcome and complication rates of "Rescue Screws" with elective SI-screw fixations.

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Background: The timing of major fracture care in polytrauma patients has a relevant impact on outcomes. Yet, standardized treatment strategies with respect to concomitant injuries are rare. This study aims to provide expert recommendations regarding the timing of major fracture care in the presence of concomitant injuries to the brain, thorax, abdomen, spine/spinal cord, and vasculature, as well as multiple fractures.

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  • Scientists found a special marker called SSEA-4 that shows up on immature cells during pregnancy and is also found in a type of cancer called Ewing sarcoma.
  • This marker was present on most cancer cell lines and many tumor samples, and higher levels of SSEA-4 were linked to more aggressive cancer behavior.
  • T cells, which are part of our immune system, can be specially trained to target cells with SSEA-4, making it a promising way to treat this type of cancer in the future.
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The strategies for the timing of fracture fixation in polytrauma patients have changed with improvements in resuscitation and patient assessment. Specifically, the criteria for damage control have been formulated, and more precise parameters have been found to determine those patients who can safely undergo primary definitive fixation of major fractures. Our current recommendations are supported by objective and data-based criteria and development groups.

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Background: The aim of the study was to determine the impact that PHTLS course participation had on self-confidence of emergency personnel, regarding the pre-hospital treatment of patients who had suffered severe trauma. Furthermore, the goal was to determine the impact of specific medical profession, work experience and prior course participation had on the benefits of PHTLS training.

Methods: A structured questionnaire study was performed.

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Purpose: Cytokine-engineering of chimeric antigen receptor-redirected T cells (CAR T cells) is a promising principle to overcome the limited activity of canonical CAR T cells against solid cancers.

Experimental Design: We developed an investigational medicinal product, GD2IL18CART, consisting of CAR T cells directed against ganglioside GD2 with CAR-inducible IL18 to enhance their activation response and cytolytic effector functions in the tumor microenvironment. To allow stratification of patients according to tumor GD2 expression, we established and validated immunofluorescence detection of GD2 on paraffin-embedded tumor tissues.

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The timely initiation of extracorporeal membrane oxygenation (ECMO) is crucial for providing life support. However, delays can occur when perfusionists are not readily available. The Jena Method aims to address this issue by offering a wet-primed ECMO system that can be rapidly established without the perfusionist's presence.

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We present a novel application of a nanocrystalline boron-doped diamond electrode (B-NCDE) for the construction of an electrochemical DNA biosensor based on double-stranded DNA (dsDNA) for various bioanalytical applications. Surface characterization of the transducer surface (prior and after the fabrication of negatively charged O-terminated surface - O-B-NCDE) was performed by scanning electron microscopy (SEM), Raman spectroscopy, and linear sweep voltammetry (LSV) that was further used for the voltammetric determination, scan rate dependence investigation, and repeatability examination of dsDNA electrochemical oxidation at the O-B-NCDE. The fabrication of a dsDNA/O-B-NCDE biosensor via electrostatic adsorption of dsDNA involved a thorough optimization process of deposition potential (E), deposition time (t), and optimal saturation concentration (c) with optimal values of 0.

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Introduction: Along with recent advances in analytical technologies, tricarboxylic acid-cycle intermediates are increasingly identified as promising makers for cellular ischemia and mitochondrial dysfunction during hemorrhagic shock. For traumatized patients, the knowledge of the role of lipid oxidation substrates is sparse. In this study, we aimed to analyze the dynamics of systemic acylcarnitine (AcCa) release in a standardized polytrauma model with hemorrhagic shock.

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The PI3K-AKT-mTOR pathway lies at the confluence of signaling pathways in which various components are subjected to activating genetic alterations in acute myeloid leukemia (AML), thus contributing to oncogenesis. Three AKT isoforms exist in humans. However, whether one isoform predominates in AML remains unknown.

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As chimeric antigen receptor (CAR) T cell therapy continues to gain attention as a valuable treatment option against different cancers, strategies to improve its potency and decrease the side effects associated with this therapy have become increasingly relevant. Herein, we report an alternative CAR design that incorporates transmembrane domains with the ability to recruit endogenous signaling molecules, eliminating the need for stimulatory signals within the CAR structure. These endogenous signaling molecule activating (ESMA) CARs triggered robust cytotoxic activity and proliferation of the T cells when directed against the triple-negative breast cancer (TNBC) cell line MDA-MB-231 while exhibiting reduced cytokine secretion and exhaustion marker expression compared to their cognate standard second generation CARs.

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Background: The timing of definitive surgery in multiple injured patients remains a topic of debate, and multiple concepts have been described. Although these included injury severity as a criterion to decide on the indications for surgery, none of them considered the influence of injury distributions. We analyzed whether injury distribution is associated with certain surgical strategies and related outcomes in a cohort of patients treated according to principles of early and safe fixation strategies.

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Article Synopsis
  • - The senescence-associated secretory phenotype (SASP) is when old or damaged cells release certain substances that can help with tissue repair but can also cause problems, especially in healing fractures.
  • - Some drugs called senolytics can get rid of these old cells, which might help improve healing from fractures and other aging issues.
  • - Researchers are studying how SASP affects fracture healing to find better treatments, and they are also testing these senolytics to see how well they work in real-life situations.
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The quality of recorded peripheral nerve signals is decisive for their application in therapies. The electroneurogram can be recorded via implantable circumeural electrodes that are wrapped around the peripheral nerve. The shape and amplitude of the signal recorded by the electrode are influenced by the design and contact configuration of the electrode.

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Background: 3D-navigation for percutaneous sacroiliac (SI) screw fixation is becoming increasingly common and several studies report great advantages of this technology. However, there is still limited clinical evidence on the efficacy regarding radiation exposure for patient and personnel.

Methods: This is a retrospective, single-center cohort study.

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Backround: The beneficial effects of unrestricted postoperative full weight bearing for elderly patients suffering hip fractures have been demonstrated. However, there is still existing disagreement regarding acetabular fractures.The aim of this biomechanical study was to evaluate the initial load bearing capabilities of different fixation constructs of anterior column fractures (ACFs) in osteoporotic bone.

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