The Mina and Everard Goodman Faculty of Life Sciences and The Leslie and Susan Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel.
Published: February 2009
AI Article Synopsis
Article Abstract
Background: One of the major causes of transplanted organs' dysfunction is ischemia-reperfusion injury, where mitochondrial dysfunction is the primary contributor to cell damage. Mitochondrial NADH fluorescence reliably describes intracellular oxygen deficiency and mitochondrial function. Therefore, its monitoring at the tissue level, together with other physiological parameters, can serve to evaluate tissue vitality.
Methods: The multiprobe assembly (MPA) enabled the assessment of renal blood flow (RBF) using laser Doppler flowmetry, mitochondrial NADH redox state using the fluorometric technique, and ionic homeostasis using specific mini-electrodes (K(+) and H(+)). The MPA was utilized in two rat groups in which ischemia was induced for a period of 25-30 min (group 1) or for 60 min (group 2), and RBF and NADH were also monitored in a group of rats that underwent a complete kidney ischemia 24 h before the monitoring - a well-known model of acute renal failure.
Results: During ischemia, the RBF was completely abolished, NADH and extracellular potassium levels increased, and extracellular pH decreased. Immediately after the reperfusion, full recovery was observed; however, in the rats undergoing 60-min ischemia followed by 24-hour reperfusion, the tissue hemodynamic and mitochondrial functions were significantly impaired.
Conclusion: This study demonstrates the advantage of using the MPA for real-time evaluation of kidney physiological state, which may serve as a practical instrument for the evaluation of graft viability during transplantation procedures.
Molecular recognition, involving the binding of two or more molecules, is widely found in multiple disciplines. It plays a crucial role in driving specific molecular functionalization or biological activities such as antigen-antibody interactions. Recently, the molecular recognition of single peptides self-assembly at interfaces has been widely investigated since their broad applications in biosensors and bioelectronics.
A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
Two-dimensional (2D) titanium carbide MXene (TiCT) has attracted significant attention due to its combination of properties and great promise for various applications. The size of the 2D sheets is a critical parameter affecting multiple properties of assembled films, fibers and 3D structures. The increased lateral size of MXene flakes can benefit not only their assemblies by improving the interflake contacts and alignment but also fundamental studies at the individual flake level, allowing for facile patterning and investigation of intrinsic physical properties of MXenes.
Balanced chromosomal aberrations have been shown to affect fertility in most species studied, often leading to hypoprolificacy (reduced litter size) in domestic animals such as pigs. With an increasing emphasis in modern food production on the use of a small population of high quality males for artificial insemination, the potential economic and environmental costs of hypoprolific boars, bulls, rams etc. are considerable.
Rapid and reproducible assembly of aligned nanostructures on a wafer-scale is a crucial, yet one of the most challenging tasks in the incorporation of nanowires into integrated circuits. We present the synthesis of a periodic nanochannel template designed for electrochemical growth of perfectly aligned, rectangular nanowires over large areas. The nanowires can be electrically contacted and characterized in situ using a pre-patterned multi-point measurement platform.
Department of Chemistry and ‡Molecular Organisation and Assembly in Cells Doctoral Training Centre, University of Warwick, Coventry, CV4 7AL, United Kingdom.
We introduce a multiprobe platform for the investigation of single-walled carbon nanotubes (SWNTs) that allows the electrochemical response of an individual SWNT to be mapped at high spatial resolution and correlated directly with the intrinsic electronic and structural properties. With this approach, we develop a detailed picture of the factors controlling electrochemistry at SWNTs and propose a definitive model that has major implications for future architectures of SWNT electrode devices.
