The addition of whey protein to a carbohydrate–electrolyte drink does not influence post-exercise rehydration

The addition of whey protein to a carbohydrate-electrolyte drink has been shown to enhance post-exercise rehydration when a volume below that recommended for full fluid balance restoration is provided. We investigated if this held true when volumes sufficient to restore fluid balance were consumed, and if differences might be explained by changes in plasma albumin content. Sixteen participants lost ~1.9% of their pre- exercise body mass by cycling in the heat and rehydrated with 150% of body mass lost with either a 60 g·L-1 carbohydrate drink (CHO) or a 60 g·L-1 carbohydrate, 20 g·L-1 whey protein isolate drink (CHO-P). Urine and blood samples were collected pre-exercise, post-exercise, post- rehydration and every hour for 4 h post-rehydration. There was no difference between trials for total urine production (CHO 1057±319 mL; CHO-P 970±334 mL; P=0.209), drink retention (CHO 51±12%; CHO-P 55±15%; P=0.195) or net fluid balance (CHO -393±272 mL; CHO-P - 307±331 mL; P=0.284). Plasma albumin content relative to pre-exercise was increased from 2-4 h during CHO-P only. These results demonstrate that the addition of whey protein isolate to a carbohydrate-electrolyte drink neither enhances nor inhibits rehydration. Therefore, where post- exercise protein ingestion might benefit recovery, this can be consumed without effecting rehydration

Preemption of Local Regulation of Radio Antennas: A Post- Deerfield Policy for the FCC

The proliferation of novel radio delivery systems has resulted in the construction of new forms of radio antennas. Many localities have placed restrictions on the size and/or placement of these antennas, significantly hindering or blocking signal reception. Because the FCC has adopted rules that only partially preempt local regulations, municipalities have enacted laws restricting the use of home satellite dishes. A recent challenge to one such regulation resulted in a Second Circuit decision limiting the scope of FCC review of local regulations. The Authors suggest that the FCC need not take extreme measures such as total preemption or national zoning to enforce their policies. Alternatives that recognize the legitimate objectives of municipal zoning regulations and allow the FCC to correct misinterpretation of the Commission\u27s local zoning preemptive regulations are recommended

CCCXXVIII.?The reactivity of methyl groups in heterocyclic bases

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Expanding Space: the Root of all Evil?

While it remains the staple of virtually all cosmological teaching, the concept of expanding space in explaining the increasing separation of galaxies has recently come under fire as a dangerous idea whose application leads to the development of confusion and the establishment of misconceptions. In this paper, we develop a notion of expanding space that is completely valid as a framework for the description of the evolution of the universe and whose application allows an intuitive understanding of the influence of universal expansion. We also demonstrate how arguments against the concept in general have failed thus far, as they imbue expanding space with physical properties not consistent with the expectations of general relativity.Comment: 8 pages, accepted for publication in PAS

The Route of Sir John Franklin's Third Arctic Expedition: An Evaluation and Test of an Alternative Hypothesis

An archaeological survey to aid in the determination of the exact route of the last Sir John Franklin expedition following its overwintering at Beechey Island in 1845-46 was conducted in June 1982. The survey was designed to test the hypothesis that the expedition sailed from Beechey Island south to King William Island via McClintock Channel, rather than through Peel Sound and Franklin Strait, as is generally accepted. Surveyed areas included Kilian, Stefansson, and northeast Victoria Islands in northwest McClintock Channel, and Russell and northern Prince of Wales Islands to the northeast of McClintock Channel. Although three cairns associated with Austin's searching expedition of 1850-51 were located, as well as several prehistoric and historic Inuit sites, no structures or materials associated with the Franklin expedition were identified. While inconclusive, the survey essentially completes the examination of coastlines along which the Franklin expedition may have sailed.Key words: Sir John Franklin, route of third arctic expedition, McClintock ChannelEn juin 1982, on a effectué une étude archéologique destinée à permettre de retracer la route empruntée par la dernière expédition de sir John Franklin après le long hivernage de 1845-46 à l'île Beechey. L'étude avait pour but de vérifier l'hypothèse selon laquelle l'expédition avait navigué de l'île Beechey en direction du sud vers l'île du Roi-Guillaume via le chenal McClintock, plutôt qu'à travers le détroit de Peel et celui de Franklin, comme on le pense habituellement. Les régions de l'étude comprenaient les îles Kilian et Stefansson et le nord-est de l'île Victoria dans la partie nord-ouest du chenal McClintock, ainsi que l'île Russell et la partie septentrionale de l'île du Prince-de-Galles au nord-est du chenal McClintock. Bien qu'on ait localisé trois cairns datant de l'expédition de recherche menée par Austin en 1850-51, ainsi que divers sites inuit préhistoriques et historiques, on n'a pu identifier ni structure ni matériaux remontant à l'expédition Franklin. Si l'étude n'a pas abouti à une conclusion définitive, elle a du moins permis de compléter l'examen du rivage côtier le long duquel l'expédition Franklin a pu naviguer.Mots clés: sir John Franklin, route de la troisième expédition arctique, chenal McClintoc

Geochemistry of vanadium in hyperalkaline environments

Hyperalkaline environments associated with leaching of industrial wastes such as steel slags can have a number of deleterious effects on their local environment including rapid carbonate precipitation and mobilisation of potentially toxic trace metals. Steel slag is the primary byproduct of steelmaking and is enriched in trace elements such as Al, Cr and V. V is of particular concern due to its high concentration in steel slag, its potential toxicity and its mobility in high pH leachate as the vanadate oxyanion (VO43-). This study used aerated and air-excluded batch leaching tests, aerated leachate neutralisation tests, field observations, X-ray microanalysis and electron microscopy techniques to investigate the effects of environmental conditions on V mobility, leachate chemistry and secondary phase formation during weathering of steel slags. Scanning electron microscopy/energy- dispersive X-ray spectroscopy (SEM/EDX) identified four principal mineral phases in unweathered slag comprising dicalcium silicate (Ca2SiO4), dicalcium aluminoferrite (Ca2(Al,Fe)2O5), a CaO-rich phase, and a Wüstite-like solid solution ((Fe, Mn, Mg, Ca)O). V was primarily incorporated in the dicalcium aluminoferrite (~1.1 wt%) and dicalcium silicate phases (~0.4 wt%). During leaching, alkalinity was rapidly produced by dissolution of dicalcium silicate and free lime resulting in a high pH (11.5 – 12.5) leachate. Dicalcium silicate dissolution leads to oversaturation with respect to calcium silicate hydrate (Ca-Si-H) phases and their subsequent precipitation. Under aerated conditions, in-gassing of atmospheric CO2 resulted in CaCO3 precipitation which consumed OH- ions and subsequently lowered solution pH to ~8.0. Micro-focus X-ray absorption spectroscopy (µXAS) analysis showed that V was released as V5+ during dicalcium silicate dissolution. V release was significantly higher under aerated conditions than under air-excluded conditions (~850 ppb and 490 ppb respectively in block leaching tests). Aqueous V concentrations were influenced by Ca3(VO4)2 solubility limits which imposed an inverse relationship on Ca and V concentrations. In air-excluded systems, leachate reaches saturation with respect to Ca3(VO4)2 which precipitates thus limiting aqueous V concentrations. Under aerated conditions, precipitation of CaCO3 provided a sink for aqueous Ca. Leachate therefore remained undersaturated with respect to Ca3(VO4)2, allowing higher concentrations of V to accumulate in solution. Leachate neutralisation experiments showed that some V was incorporated into neo-formed CaCO3 at high pH. V removal was enhanced in the presence of goethite (α-FeOOH). Extended X-ray absorption fine structure (EXAFS) analysis showed that vanadate adsorbed to goethite by formation of inner-sphere complexes indicating that Fe (oxy)hydroxides provide an important environmental sink for V in steel slag leachates. This study highlights the importance of leaching environment for V mobility during weathering of steel slags and suggests that prospects for slag reuse and storage may be improved by the formation of a weathered region containing secondary phases including Ca-Si-H and CaCO3. Leachate neutralisation results demonstrate removal mechanisms for aqueous V which will assist with environmental risk assessment and remediation at legacy sites where leachate has been released to the local aquatic environment

Development and characterisation of antiretroviral drugs encapsulated in polymer stabilised oil-in-water nanoemulsions

HIV continues to be a global healthcare challenge, with estimates suggesting there are currently 35.5 million infected people globally. To date, there have been an estimated 36 million HIV/AIDS related deaths worldwide. The story is changing however, with the advent of Highly Active Antiretroviral Therapies (HAART), allowing patients to live to normal life expectancies and with increasingly better quality of life. This, coupled with the fact that there has been a 40-fold increase in the number of people with access to antiretroviral therapy, has led to a 29% reduction in AIDS related deaths since 2005. Despite this encouraging data, there are still numerous limitations of antiviral therapy, including poor bioavailability, poor patient adherence, and emerging resistance. It is hoped that nanomedicine may offer a route to alleviating some of these issues by achieving an equal therapeutic concentration of drug but with a lower dose. The aims of this thesis were to develop a novel nanoemulsion based formulation of EFV and LPV and to assess the suitability of this formulation as dosage form. Nanoemulsions can be stabilised by surfactants, but often this can have unwanted safety profiles. Stabilisation can also be achieved using amphiphillic polymers that can be synthesised using biocompatible monomers like ethylene glycol. Chapter 2 demonstrates the synthesis of Ethylene Glycol based polymers using both conventional free radical and Atom Transfer Radical Polymerisation techniques. Nanoemulsions have previously been shown in the literature to increase the bioavailability of poorly water-soluble drugs, Chapter 3 shows the development and optimisation of an Oil-in-Water nanoemulsions. The data showed that nanoemulsions synthesised with volatile cosolvents were able to achieve sub 300 nm diameters and have good long-term stability. Increasing the accumulation and permeation of a poorly water-soluble compound should lead to improvements in bioavailability. Chapter 4 shows that the optimal nanoemulsion had comparable accumulation to aqueous solutions and superior apparent permeability cross Caco-2 cell monolayers. The antiviral activity was equipotent to the aqueous solution, as shown in Chapter 5. This confirms that nanoemulsion did not prevent the API from reaching its sight of action. Finally, all new formulations have the potential for detrimental side effects and immunological responses. It is therefore necessary to conduct pre clinical studies to predict such occurrences. Chapter 6 details the lack of immunological response seen in nanoemulsions, but highlights potential interactions with coagulation. In conclusion, this study has found that polymer stabilised oil-in-water nanoemulsions based on Castor oil have promising safety and pharmacological profiles. Further in vivo and studies are now warranted in order to further predict the suitability of nanoemulsions in man

Effect of whey protein isolate on rehydration after exercise

Studies have examined adding protein to carbohydrate-electrolyte rehydration drinks, but the effects of protein in isolation remain unknown. Ten subjects completed two trials in which they were dehydrated (~2% of pre-exercise body mass) by intermittent cycling in the heat. Subjects then rehydrated (150% total mass loss) over 1 h with mineral water (W) or mineral water plus 20 g·L-1 whey protein isolate (WP) and remained in the laboratory for a further 4 h. Blood and urine samples were provided pre-exercise, post-exercise, post-rehydration and every hour thereafter. From blood samples, serum osmolality, change in plasma volume and plasma albumin content was determined, whilst the volume and osmolality of urine samples were determined. There was no difference between trials for total urine volume (W: 1234 (358) mL; WP: 1306 (268) mL; P=0.409), drink retention (W: 40 (14) %; WP: 37 (14) %; P=0.322) or net fluid balance (W: -605 (318) mL; WP: -660 (274) mL; P=0.792) 4 h post-rehdyration. Plasma volume was greater 3 and 4 h post-drinking during WP and plasma albumin content relative to pre-exercise was increased 1-4 h post-drinking in WP only. These results suggest addition of 20 g·L-1 whey protein isolate neither enhances nor inhibits post-exercise rehydration, when a volume equivalent to 150% of sweat losses is ingested in 1 h. As post-exercise nutritional requirements are multifactorial (rehydration, glycogen resynthesis, myofibrillar/ mitochondrial protein synthesis), these data demonstrate that when post-exercise protein intake might benefit recovery or adaptation, this can be achieved without compromising rehydration

Metal alkoxides as transesterification catalysts

EThOS - Electronic Theses Online ServiceGBUnited Kingdo