Interference-Based Optimal Power-Efficient Access Scheme for Cognitive Radio Networks

In this paper, we propose a new optimization-based access strategy of multipacket reception (MPR) channel for multiple secondary users (SUs) accessing the primary user (PU) spectrum opportunistically. We devise an analytical model that realizes the multipacket access strategy of SUs that maximizes the throughput of individual backlogged SUs subject to queue stability of the PU. All the network receiving nodes have MPR capability. We aim at maximizing the throughput of the individual SUs such that the PU's queue is maintained stable. Moreover, we are interested in providing an energy-efficient cognitive scheme. Therefore, we include energy constraints on the PU and SU average transmitted energy to the optimization problem. Each SU accesses the medium with certain probability that depends on the PU's activity, i.e., active or inactive. The numerical results show the advantage in terms of SU throughput of the proposed scheme over the conventional access scheme, where the SUs access the channel randomly with fixed power when the PU is sensed to be idle

The kidneys as an emerging target for the treatment of diabetes mellitus: What we know, thought we knew and hope to gain

AbstractGlucose filtered by kidneys is reabsorbed into the proximal tubule through the sodium-coupled glucose co-transporter (SGLT2). This promotes urinary excretion of glucose and results in lowering of plasma glucose level. Administration of agents (e.g. dapagliflozin) that inhibits SGLT2 transporter have shown to be associated with improvement in hyperglycaemia without clinically persistent electrolytes disturbances or change in osmolarity. This may suggest that administration of dapagliflozin is effective and safe as treatment for hyperglycaemia. Ongoing clinical trials will reveal the potential benefit and safety of SGLT2 inhibitors as part of the therapy of type 2 diabetes

Editorial – A Glimpse into the Future of Medical Education in Sudan

This is an Editorial and does not have an abstract. Please download the PDF or view the article in HTML

A North African Judaeo-Arabic letter from the Prize Papers Collection

Este estudio ofrece una edición, traducción y análisis lingüístico de carta judeo-árabe de la colección Prize Papers. La carta presenta documentos judeoárabes argelinos previamente inexplorados de la colección Prize Papers y que constituyen una oportunidad única para estudiar la historia, la lengua y la cultura del comercio judío en el Mediterráneo y en el norte de África a fines del siglo XVIII.This paper presents an edition, translation and linguistic analysis of a Judaeo-Arabic letter from the Prize Papers Collection. The letter introduces previously unexplored Algerian Judaeo-Arabic documents from the Prize Papers Collection, which constitute a unique chance to study the history, language and culture of Jewish trading across the Mediterranean and North Africa during the late 18th century

Influence of Trichoderma reesei or Saccharomyces cerevisiae on performance, ruminal fermentation, carcass characteristics and blood biochemistry of lambs fed Atriplex nummularia and Acacia saligna mixture

The mixtureof A.nummularia and A.saligna (1:1 DM)was autoclaved(TuttnauerUSACo.Ltd.,NY,USA)at121 °C and1.5psi for 15mintodestroyanymicrobes.Thecontentwasallowedto cool andlaterinoculatedwiththesporesof T.reesei at arateof 40 mLofthesporesuspensioncontaining107 spores permL/kg DM ofautoclaved A.nummularia and A.saligna mixture. Thein- oculatedsubstrateswerethenincubatedatambienttemperature for 10days.Bytheendoftheincubationperiod,theforageswere fullycoveredwiththefungus.Theywerethenovendriedat70 °C in aforcedairdryingoven(CascadeTEK’s ModelTFO-10,OR,USA) for 24hsoastostopfungalgrowthandpreventfurtherdena- turationofproteins.The aim of this study was to evaluate whole substitution of Egyptian berseem hay (Trifolium alexandrinum) with a mixture of Atriplex nummularia and Acacia saligna (1:1 DM) in the diet of Barki lambs for 70 days. Thirty six lambs (27.0±0.89 kg initial BW) were divided into four treatment groups of nine lambs each and fed: (1) the Control group with no substitution (70% concentrate mixture and 30% berseem hay, DM basis), (2) A. nummularia and A. saligna mixture without fungal treatment (treatment group AU), or (3) Trichoderma reesei treated A. nummularia and A. saligna mixture (treatment group AF), or (4) A. nummularia and A. saligna mixture supplemented with Saccharomyces cerevisiae at 0.5 g/kg DM of feed (treatment group AS) replaced 100% of berseem hay in the diet. Live-weight change, rumen fermentation parameters, blood chemistry, carcass characteristics and intestinal histology were investigated. Significant (P0.05). Lambs fed AF and AU diets had lower (P<0.05) feed conversion efficiency than lambs fed the AS and Control diets. Lambs fed AF and AS had increased (P<0.05) volatile fatty acid production compared to Controls. Blood albumin and urea concentrations increased (P<0.05) with lambs in AS treatment compared to lambs in the other treatments, while lambs fed AF had lower (P<0.05) cholesterol and glucose concentrations compared to the Controls. The AS lambs had the highest (P<0.05) dressing percentage. Decreased intramuscular fat weights were obtained with lambs fed halophytes compared to Control lambs. Histology of the ileum, sub mucosa and Peyer's patches were normal in all lambs. In conclusion, untreated halophyte mixtures of A. nummularia and A. saligna (at 1:1 DM) can be substituted for berseem hay without negative effects on performance while treatment with S. cerevisiae may improve performance and, like T. reesei, change certain biochemical responses