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Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

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Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek Xavier Monforte Johannes c.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller david Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGcs). However, the use of tNGcs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGc would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGcs and compared the various features of these improved silk^(+) tNGcs with the tubes without holes(silk^(–) tNGcs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGcs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGcs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGcs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGcs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

coronavirus disease-2019: A tocsin to our aging, unfit, corpulent, and immunodeficient society

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Journal of Sport and Health Science 2020年第4期9卷 293-301页

作者： david c.Nieman Department of Biology College of Arts and SciencesAppalachian State UniversityNorth Carolina Research CampusKannapolisNC 28081USA

Acute and chronic respiratory illnesses cause widespread morbidity and mortality,and this class of illness now includes the novel coronavirus severe acute respiratory syndrome that is causing coronavirus disease-2019(cOVID-19).The world is experiencing a major demographic shift toward an older,obese,and physically inactive *** factor assessments based on pandemic data indicate that those at higher risk for severe illness from cOVID-19 include older males,and people of all ages with obesity and related comorbidities such as hypertension and type 2 *** in and of itself leads to negative changes in innate and adaptive immunity,a process termed *** causes systemic inflammation and adversely impacts immune function and host defense in a way that patterns *** primary prevention strategies to reduce the risk for cOVID-19 at both the community and individual levels include mitigation activities and the adoption of lifestyle practices consistent with good immune *** and human studies support the idea that,in contrast to high exercise workloads,regular moderate-intensity physical activity improves immunosurveillance against pathogens and reduces morbidity and mortality from viral infection and respiratory illnesses including the common cold,pneumonia,and *** odds are high that infectious disease pandemics spawned by novel pathogens will continue to inflict morbidity and mortality as the world’s population becomes older and more ***-19 is indeed a wake-up call,a tocsin,to the world that primary prevention countermeasures focused on health behaviors and hygiene demand our full attention and support.

关键词： cOVID-19 Exercise Immunology Infection Obesity

ANALYSIS OF LIQUID SLUG MOTION IN A VOIDED LINE

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Journal of Hydrodynamics 1993年第3期5卷 75-88页

作者： Yang, Jiandong Wigget, david c Wuhan Univ of Hydraulic and Electric Engineering Wuhan China

A quasi two-dimensional two-phase flow cylinder model of slug motion in a voided line developed in this paper can predict reasonably the change of flow pattern of the slug, air entrainment, holdup and the distribution of axial velocity. However, if using the theory of transfer momentum to estimate the pressure-time history of slug at the elbow, the result of calculation is not good in agreement with that of experiment. Analysis of the experiment results and the estimations of using the theory of transient two-phase flow indicate that an evident water hammer response occurs in the slug, when the high-speed slug impacts on the elbow, and the peaks and waveform of pressure-time history are dependent mainly on the propagation of transient two-phase flow in the slug.

关键词： Pipe flow Water hammer

Exercise immunology:Novel insights

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Journal of Sport and Health Science 2024年第3期13卷 277-279,I0001页

作者： david c.Nieman Human Performance Laboratory Appalachian State UniversityNorth Carolina Research CampusKannapolisNC 28081USA

The coronavirus disease 2019(cOVID-19)pandemic heightened worldwide attention on the influence of exercise on the immune *** were raised about whether regular moderate-to-vigorous physical activity(MVPA)could help prevent cOVID-19 or mitigate symptoms when *** MVPA bolster immunity among those most prone to cOVID-19 including the elderly,obese,and immunocompromised patients?Does regular MVPA dampen systemic inflammation,thereby lessening the cOVID-19 cytokine storm?

关键词： immunity inflammation thereby

Artificial intelligence analysis of videos to augment clinical assessment:an overview

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Neural Regeneration Research 2024年第4期19卷 717-718页

作者： david c.Wong Stefan Williams University of Leeds Leeds Teaching Hospitals Trust LeedsUK

Observation is a fundamental part of the practice of clinical *** of movement is particularly important for the *** such as Parkinson’s disease,multiple sclerosis,stroke,epilepsy,and many others affect a person’s movement in characteristic *** some conditions,changes in the patient’s voice can be included in this-changes in sound caused by changes in the movements of *** clinician’s detection of a characteristic abnormality,and their judgment of its severity,plays a central role in both diagnosis and the assessment of prognosis or response to ***,that practice depends upon a limited resource of experienced *** addition,these experts are limited by human visual judgment,which cannot reliably or precisely detect and measure small or subtle changes in movement(Williams et al.,2023).

关键词： clinical epilepsy diagnosis

Balancing machine learning and artificial intelligence in soil science with human perspective and experience

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Pedosphere 2024年第1期34卷 9-12页

作者： david c.WEINDORF Somsubhra cHAKRABORTY Department of Earth and Atmospheric Science Central Michigan Universityount Pleasant M148859USA Agricultural and Food Engineering Department Indian Institute of TechnologyKharagpur 721302India

Machine learning and artificial intelligence continue to evolve at a rapid pace, with many potential applications related to soil science. Even so, human experience and perception play an invaluable role in characterizing soil properties, especially qualitative properties that may elude sensing/computer-based modeling approaches. The elegant solution to this conundrum relies on the synthesis of computer-aided predictive modeling with human insight and *** global population surpasses 8 billion, the importance of optimized agronomic production to feed a hungry world has never been more important.

关键词： soil elude qualitative

New Generations: Sequencing Machines and Their computational challenges

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Journal of computer Science & Technology 2010年第1期25卷 3-9页

作者： david c. Schwartz Michael S. Waterman Laboratory for Molecular and computational Genomics Departme4nt of Chemistry and Laboratory of Genetics University of Wisconsin-Madison Department of Biological Sciences University of Southern California Department of Automation Tsinghua University

New generation sequencing systems are changing how molecular biology is practiced. The widely promoted $1000 genome will be a reality with attendant changes for healthcare, including personalized medicine. More broadly the genomes of many new organisms with large samplings from populations will be commonplace. What is less appreciated is the explosive demands on computation, both for cPU cycles and storage as well as the need for new computational methods. In this article we will survey some of these developments and demands.

关键词： genome sequencing new generation sequencing read mapping optical mapping sequence assembly Eulerian graphs

Vasectomy techniques-need for better occlusion methods

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Asian Journal of Andrology 2010年第3期12卷 442-443页

作者： david c. Sokal Behavioral and Biomedical Research Family Health International Research Triangle Park NC 27709 USA

I was disappointed to read about a device that was not successful in producing reliable vas occlusion in Amory et al. ＇s report in this issue of the journal [1]. For those who are unfamiliar with vasectomy terminology, it is important to understand that a vasectomy procedure has three major aspects：（1） anesthesia; （2） accessing or approaching the vas （that is, the method used to isolate a loop of the vas）; and （3） occluding the vas.

关键词： Vasectomy occlusion methods

Longwall automation: Delivering enabling technology to achieve safer and more productive underground mining

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International Journal of Mining Science and Technology 2015年第6期25卷 865-876页

作者： Ralston Jonathon c. Reid david c. Dunn Mark T. Hainsworth david W. coal Mining Research Program CSIRO Energy

The ongoing need to deliver improved safety, productivity and environmental benefit in coal mining presents an open challenge as well as a powerful incentive to develop new and improved solutions. This paper assesses the critical role that enabling technologies have played in the delivery of remote and automated capability for longwall mining. A brief historical account is given to highlight key technical contributions which have influenced the direction and development of present-day longwall technology. The current state of longwall automation is discussed with particular attention drawn to the technologies that enable automated capability. Outcomes are presented from an independently conducted case study that assessed the impact that cSIRO＇s LASc longwall automation research has made to the longwall mining industry in Australia. Importantly, this study reveals how uptake of this innova- tive technology has significantly benefitted coal mine productivity, improved working conditions for personnel and enhanced environmental outcomes. These benefits have been widely adopted with cSIRO automation technology being used in 60 per cent of all Australian underground operations. International deployment of the technology is also emerging. The paper concludes with future challenges and opportunities to highfight the ongoing scope for longwall automation research and development.

关键词： Safety Productivity Environment Mining automation Longwall mining Remote mining