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Chemical forms and extractability of iron in sediments of three contrasting lakes of China and UK

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Journal of Environmental Sciences 2003年第6期15卷 728-733页

作者： Gibson C.E.,stewart b.M. Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Department of Agricultural and Environmental Science Queen's University belfast Shenyang 110016 China Newforge Lane belfast bT9 5PX UK

Iron is a limiting factor for the eutrophication of lakes, especially those lakes that are enriched with phosphorus. Extractability of iron in sediments of West Lake and Taihu Lake in China and Lower Lough Erne in Northern Ireland of UK was comparatively investigated on the basis of analysing chemical forms of iron using different extractants. It was shown that extractable iron in sediments of the lakes was greatly different using various extractants. Reactive iron or easily released iron such as “active" iron oxides, total free iron oxide and water-soluble iron was not high, only accounting for 0.01%—0.15% of total iron. The efficiency of the extractants for exchangeable iron was decreased in the sequence 0.1 mol/L HCl DTPA+TEA mixed solution > 1 mol/L NH 4OAc > 0.5 mol/L MgCl 2 = 0.5 mol/L CaCl 2. It seems that the complexion of iron by organic matter was not strong because the concentration of organically bound iron was significantly lower than the concentration it was forecasted. Extractable iron is not entirely consistent with or dependent on total iron in lake sediments. To a certain extent, phosphate can inhibit the release of iron in sediments of the lakes. The selection of extractants is thus the first key step to evaluate bioavailability of iron in lake sediments.

关键词： iron chemical form extractability lake sediment eutrophication

Validity of a noninvasive estimation of deep body temperature when wearing personal protective equipment during exercise and recovery

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Military Medical Research 2019年第4期6卷 328-339页

作者： Andrew P.Hunt Mark J.buller Matthew J.Maley Joseph T.Costello Ian b.stewart School of Exercise and Nutrition Sciences&Institute of Health and biomedical Innovation Queensland University of TechnologyBrisbaneQLDAustralia United States Army Research Institute of Environmental Medicine NatickMAUSA Extreme Environments Laboratory Department of Sport and Exercise ScienceUniversity of PortsmouthPortsmouthUK

background:Deep body temperature is a critical indicator of heat ***,direct measures are often invasive,costly,and difficult to implement in the *** study assessed the agreement between deep body temperature estimated from heart rate and that measured directly during repeated work bouts while wearing explosive ordnance disposal(EOD)protective clothing and during ***:Eight males completed three work and recovery periods across two separate *** consisted of treadmill walking on a 1%incline at 2.5,4.0,or 5.5 km/h,in a random order,wearing EOD protective *** temperature and relative humidity were maintained at 24℃and 50%[Wet bulb globe temperature(WbGT)(20.9±1.2)℃]or 32℃and 60%[WbGT(29.0±0.2)℃]on the separate days,*** rate and gastrointestinal temperature(TGI)were monitored continuously,and deep body temperature was also estimated from heart rate(ECTemp).Results:The overall systematic bias between TGI and ECTemp was 0.01℃with 95%limits of agreement(Lo A)of±0.64℃and a root mean square error of 0.32℃.The average error statistics among participants showed no significant differences in error between the exercise and recovery periods or the environmental *** TGI levels of(37.0–37.5)℃,(37.5–38.0)℃,(38.0–38.5)℃,and>38.5℃,the systematic bias and±95%Lo A were(0.08±0.58)℃,(–0.02±0.69)℃,(–0.07±0.63)℃,and(–0.32±0.56)℃,***:The findings demonstrate acceptable validity of the ECTemp up to 38.5℃.Conducting work within an ECTemp limit of 38.4℃,in conditions similar to the present study,would protect the majority of personnel from an excessive elevation in deep body temperature(>39.0℃).

关键词： Protective clothing body core temperature Heat strain Heat stress Kalman filter Explosive ordnance disposal

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Npy deletion in an alcohol non-preferring rat model elicits differential effects on alcohol consumption and body weight

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Journal of Genetics and Genomics 2016年第7期43卷 421-430页

作者： bin Qiu Richard L.bell Yong Cao Lingling Zhang Robert b.stewart Tamara Graves Lawrence Lumeng Weidong Yong Tiebing Liang Institute of Laboratory Animal Science Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100021 China Department of Psychiatry Indiana University School of Medicine Indianapolis IN 46202 USA Department of Gastroenterology Indiana University School of Medicine Indianapolis IN 46202 USA Department of Psychology Purdue School of Science Indiana University-Purdue University of Indianapolis Indianapolis IN 46202 USA Experimental Medicine Center The First Affiliated Hospital of Sichuan Medical University Luzhou 646000 China

Neuropeptide Y（NPY） is widely expressed in the central nervous system and influences many physiological *** is located within the rat quantitative trait locus（QTL） for alcohol preference on chromosome ***-nonpreferring（NP） rats consume very little alcohol,but have significantly higher NPY expression in the brain than alcohol-preferring（P） *** capitalized on this phenotypic difference by creating an Npy knockout（KO） rat using the inbred NP background to evaluate NPY effects on alcohol *** finger nuclease（ZNF） technology was applied,resulting in a 26-bp deletion in the Npy ***-PCR,Western blotting and immunohistochemistry confirmed the absence of Npy mRNA and protein in KO *** consumption was increased in Npy＋/- but not Npy-/- rats,while Npy-/- rats displayed significantly lower body weight when compared to Npy^（＋/＋） *** whole brain tissue,expression levels of Npy-related and other alcohol-associated genes,Npy1 r,Npy2r,Npy5 r,Agrp,Mc3 r,Mc4r,Crh and CrMr,were significantly greater in Npy-/- rats,whereas Pome and Crhr2 expressions were highest in Npy＋/- *** findings suggest that the NPY-system works in close coordination with the melanocortin（MC） and corticotropin-releasing hormone（CRH） systems to modulate alcohol intake and body weight.

关键词： Knockout rat Alcohol drinking behavior NPY and receptors CRH and receptors Melanocortin and receptors bDNF

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INTEGRATION OF DIGITAL GEOLOGIC,SEISMIC AND POTENTIALFIELD DATA TO DEDUCE GEOLOGIC PROCESSES CAUSING CONTINENTAL ACCRETION AND SEPARATION

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INTEGRATION OF DIGITAL GEOLOGIC,SEISMIC AND POTENTIALFIELD D...