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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

Emergency Logistics Management for hazardous Materials with Demand Uncertainty and Link Unavailability

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Journal of Systems Science and Systems Engineering 2023年第2期32卷 175-205页

作者： Ginger Y.Ke james h.Bookbinder Faculty of Business Administration Memorial University of NewfoundlandSt.John’sNewfoundland and LabradorA1B 3X5Canada Department of Management Sciences University of WaterlooWaterlooOntarioN2L 3G1Canada

Due to its harmful nature,any incident associated with hazardous material(hazmat)may cause tremendous impacts on the surrounding people and the *** on the incident involving this specific type of good,we develop a reliable and robust emergency logistics network that considers both demand uncertainty and possible unavailability of particular links.A time-based risk measure is carefully designed upon the traditional risk assessment to reflect the stakeholder’s sensitivity to risk over response *** disruption and uncertainty are modeled as two sets of scenarios which are integrated into a bi-objective robust model to evaluate the trade-offs between risk and *** effectiveness of the emergency response can be assured by expenditures that add extra capacities to certain links or establish additional facilities that aid recovery from *** apply our model and approach to a real-world network in Guangdong *** results reveal the necessity of embedding consideration of uncertainty and unreliability into emergency network design problems;outline the importance of hedging against unpredictability by system redundancies;and indicate the impact of stakeholder’s orientation towards cost and risk on the location,allocation,and routing decisions in hazmat emergency response.

关键词： Emergency response hazardous materials robust optimization link disruption emergency demand uncertainty

Imagery Enhancement and Interpretation for Remote Visual Inspection of Aging Civil Infrastructure

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Tsinghua Science and Technology 2008年第S1期13卷 375-380页

作者： Lucio Soibelman james h Garrett Department of Civil and Environmental Engineering Carnegie Mellon University

In this paper, we describe an image enhancement and interpretation methodology to enhance and recognize surface defects and critical patterns from remote imagery of sewer pipeline inspection. The objective is to provide inspectors and professionals with better tools to allow them to examine the imagery for condition assessment. We present initial results of a collaboration with a robotic company through a case study on computer-assisted processing and interpretation of sewer pipeline inspection imagery. In the mean time, the described enhancement and interpretation methodology can also be applied to sewer pipeline condition assessment in an offline mode, where this methodology can support professionals’ examination of acquired sewer condition imagery.

关键词： remote visual inspection infrastructure assessment image processing and analysis defects region of interest detection classification

Roles of Financial Innovation and Information Technology:Lessons from US Sub-prime Mortgage Crisis and Its Implications for China

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Chinese Geographical Science 2012年第3期22卷 343-355页

作者： james h LENZER JR Simon Xiaobin ZhAO International Center for China Development Studies & Department of Geography Faculty of Social Sciencesthe University of Hong KongHong KongChina

The mortgage loan has evolved from a local lending instrument into a major global security and its role is unparallel to other financial instruments in the process of financial globalization. This paper explains how technology and financial innovation transformed the mortgage loan from a local security into a premier global security traded worldwide. It examines the fundamental flaws of this process and why it does not work in regards to mortgage lending and the re-securitization products that were created through financial innovation. The findings show that regulation was unable to keep pace with financial innovation, which created an environment where actors in the financial service sector were able to behave geographically irresponsibly by using information asymmetries to their advantage by par- ticipating in moral hazard activities and engaging in other immoral and unethical business practices that were centered around localized geography, which ultimately contributed to the global financial crisis. It also examines the roll of financial innovation in regard to the Lehman Brothers Mini-Bond in hung and its role as a driving force behind China＇s newly emerging shadow banking sector. It concludes with a policy recommendation and its implication for China＇s continued economic development.

关键词： shadow banking US sub-prime mortgage crisis financial tsunami global financial crisis wealth man- agement vehicle China asset bubble

Kartogenin induces cartilage-like tissue formation in tendon–bone junction

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Bone Research 2014年第1期2卷 61-70页

作者： Jianying Zhang james h-C Wang MechanoBiology Laboratory Departments of Orthopaedic Surgery Bioengineering Mechanical Engineering and Materials Science and Physical Medicine and Rehabilitation University of Pittsburgh

Tendon-bone junctions （TBJs） are frequently injured, especially in athletic settings. healing of TBJ injuries is slow and is often repaired with scar tissue formation that compromises normal function. This study explored the feasibility of using kartogenin （KGN）, a biocompound, to enhance the healing of injured TBJs. We first determined the effects of KGN on the proliferation and chondrogenic differentiation of rabbit bone marrow stromal cells （BMSCs） and patellar tendon stern/progenitor cells （PTSCs） in vitro. KGN enhanced cell proliferation in both cell types in a concentration-dependent manner and induced chondrogenic differentiation of stem cells, as demonstrated by high expression levels of chondrogenic markers aggrecan, collagen II and Sox-9. Besides, KGN induced the formation of cartilage-like tissues in cell cultures, as observed through the staining of abundant proteoglycans, collagen II and osteocalcin. When injected into intact rat patellar tendons in vivo, KGN induced cartilage-like tissue formation in the injected area. Similarly, when KGN was injected into experimentally injured rat Achilles TBJs, wound healing in the TBJs was enhanced, as evidenced by the formation of extensive cartilage-like tissues. These results suggest that KGN may be used as an effective cell-free clinical therapy to enhance the healing of injured TBJs.

关键词： bone junction BMSCs

Porphyria cutanea tarda as a complication of therapy for chronic hepatitis C

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World Journal of Gastroenterology 2008年第38期14卷 5913-5915页

作者： james Azim heather McCurdy Richard h Moseley Division of Gastroenterology Department of Internal Medicine Department of Veterans Affairs Medical Center and University of Michigan School of Medicine Ann ArborMichigan United States

There is a strong association between porphyria cutanea tarda (PCT) and chronic viral hepatitis C. Therapy for chronic viral hepatitis C may improve PCT. however, there are only a few reports of the de novo development of PCT during therapy for chronic viral hepatitis C. We describe the development of PCT in a 56-year-old patient with chronic viral hepatitis C after 12 wk of peginterferon/ribavirin therapy. In addition, the patient was homozygous for the h63D hereditary hemochromatosis gene (hFE ) mutation. The association of PCT with chronic viral hepatitis C and the possible role of hepatic iron overload and ribavirin-induced hemolytic anemia in the development of PCT during therapy for chronic viral hepatitis C are discussed.

关键词： Porphyria hepatitis C virus Ribavirin Pegylated interferon hemochromatosis

Potential hydrodynamic origin of frictional transients in sliding mesothelial tissues

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Friction 2013年第2期1卷 163-177页

作者： Stephen h.LORING james P.BUTLER Department of Anesthesia Critical Care and Pain MedicineBeth Israel Deaconess Medical Center and Harvard Medical SchoolBoston MA 02215USA Department of Medicine Division of Sleep MedicineBrigham and Women’s Hospital and Harvard Medical SchoolBoston MA 02215USA

Steady-state and transient variations in frictional force observed in tribological experiments of mesothelial tissues sliding in lubricant were analyzed with a mathematical model to test the hypothesis that such phenomena are manifestations of elastohydrodynamic lubrication and,importantly,do not require physical contact between the sliding *** model incorporates three phenomena characteristic of elastohydrodynamic lubrication:thinning of the liquid layer between sliding surfaces under a normal load(“squeeze-out”),thickening of the liquid layer due to hydrodynamic pumping,and smoothing of the elastic surfaces caused by hydrodynamic pressure *** in soft mesothelial tissues sliding in lubricant showed variations in steady state friction with velocity,load,and lubricant *** non-steady sliding,the decay rate of frictional transients at the start of rotation varied with velocity,the amplitudes of these transients varied with the preceding periods without rotation,and frictional force varied during sinusoidal *** simulations were qualitatively similar to experimental results,supporting these *** lubricant viscosity increased lubricating layer thickness and lowered friction at low speeds and increased friction at high speeds,supporting hydrodynamic *** conclude that the frictional variations seen with sliding mesothelial tissues are consistent with elastohydrodynamic lubrication without contact between the sliding surfaces.

关键词： pleural space breathing pericardium lubrication model

Perceptual tolerance neighborhood-based similarity in content-based image retrieval and classification

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International Journal of Intelligent Computing and Cybernetics 2012年第2期5卷 164-185页

作者： Amir h.Meghdadi james F.Peters Electrical and Computer Engineering University of ManitobaWinnipegCanada School of Mathematics University of HyderabadHyderabadIndia

Purpose–The purpose of this paper is to demonstrate the effectiveness and advantages of using perceptual tolerance neighbourhoods in tolerance space-based image similarity measures and its application in content-based image classification and ***/methodology/approach–The proposed method in this paper is based on a set-theoretic approach,where an image is viewed as a set of local visual *** method also includes a tolerance relation that detects the similarity between pairs of elements,if the difference between corresponding feature vectors is less than a threshold 2(0,1).Findings–It is shown that tolerance space-based methods can be successfully used in a complete content-based image retrieval(CBIR)***,it is shown that perceptual tolerance neighbourhoods can replace tolerance classes in CBIR,resulting in more accuracy and less ***/value–The main contribution of this paper is the introduction of perceptual tolerance neighbourhoods instead of tolerance classes in a new form of the henry-Peters tolerance-based nearness measure(tNM)and a new neighbourhood-based tolerance-covering nearness measure(tcNM).Moreover,this paper presents a side–by–side comparison of the tolerance space based methods with other published methods on a test dataset of images.

关键词： Image similarity Nearness measure Distance measurement Content-based image retrieval(CBIR) Perceptual tolerance neighbourhoods Tolerance spaces Tolerances Measurement

Glucocorticoids and prostate cancer treatment： friend or foe？

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Asian Journal of Andrology 2014年第3期16卷 354-358页

作者： Bruce Montgomery heather h Cheng james Drechsler Elahe A Mostaghel Department of Medicine University of Washington Seattle Seattle Cancer Care Alliance Seattle Division of Clinical Research Fred Hutchinson Cancer Research Center Seattle Washington USA.

Glucocorticoids have been used in the treatment of prostate cancer to slow disease progression, improve pain control and offset side effects of chemo- and hormonal therapy. however, they may also have the potential to drive prostate cancer growth via mutated androgen receptors or glucocorticoid receptors （GRs）. In this review we examine historical and contemporary use of glucocorticoids in the treatment of prostate cancer, review potential mechanisms by which they may inhibit or drive prostate cancer growth, and describe potential means of defining their contribution to the biology of prostate cancer.

关键词： androgen receptor dihydrotestosterone glucocorticoid receptor glucocorticoids prostate cancer steroids testosterone