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1.
D-Aminoacidsareusuallyviewedasunnaturalisomers.Theyoccuronlyoccasionallyinsizablequantities[1].InPhascolosomaarcuatum,freealanineaccumulatewhenexposedtoenvironmentalstress.Whentheconcentrationofthisaminoacidwastestedusingenzymaticmethods,[2]onlyapproximatelyhalfthetotalamountofalaninedeterminedusinghighpressureliquidchromatography['1wasaccoountedfor.WesuspectthatD-alaninemustbepresentinP.arcuatumataratherhighlevelasD-alaninecouldnotbedetectedbythestandardenzpoaticanalysis,whichisstereospecif… 相似文献
2.
Theeffectsofgonadalsteroidsonserumgonadotropin(GtH)andgrowthhormone(GH)responseto(D-Arg6,Pro9NEt)-salmongonadotropin-releasinghormone(sGnRHA)anddomperidone(DOM),adoparnine-receptorantagonistwereinvestigatedthroughouttheseasonalreproductivecycleofcommoncarp(Cyprinuscarpio).Gonad-intactfemalefishwereimplantedintraperitioneallythrougha2～3mmincisioninthebodywallwithsilasticpelletscontainingnosteroid(blank),testosterone(T,100μg/gbodyweight),orestradiol(E2,100μg/gbodyweight).Atvariousstage… 相似文献
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INTRODUCTION Chromium is a commonly identified soils andgroundwater contaminant. Cr(VI) is toxic, carcino-genic, and has great subsurface mobility. In contrast,Cr(III) is relatively non-toxic and immobile. Muchresearch focused on the remediation of Cr(VI) such asadsorption by zeolites (Bowman, 2003) or silicas(Hideaki et al., 2002), chemical reduction by ferrousiron (Buerge and Hug, 1999; Fendorf and Li, 1996) orzero-valent iron (Powell and Puls, 1997; Alowitz andScherer, 2002), b… 相似文献
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Wan-ling HE Ying FENG Xiao-li LI Yan-yan WEI Xiao-e YANG 《Journal of Zhejiang University. Science. B》2008,9(9)
The objective of the present study was to compare the toxicity and availability of Fe(Ⅱ) and Fe(Ⅲ) to Caco-2 cells.Cellular damage was studied by measuring cell proliferation and lactate dehydrogenase (LDH) release. The activities of two major antioxidative enzymes [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and differentiation marker (alkaline phosphatase) were determined after the cells were exposed to different levels of iron salts. The cellular iron concentration was investigated to evaluate iron bioavailability. The results show that iron uptake of the cells treated with Fe(Ⅱ) is significantly higher than that of the cells treated with Fe(Ⅲ) (P＜0.05). Fe(Ⅱ) at a concentration>1.5 mmol/L was found to be more effective in reducing cellular viability than Fe(Ⅲ). LDH release investigation suggests that Fe(Ⅱ) can reduce stability of the cell membrane. The activities of SOD and GPx of the cells treated with Fe(Ⅱ) were higher than those of the cells treated with Fe(Ⅲ), although both of them increased with raising iron supply levels. The results indicate that both Fe(Ⅱ) and Fe(Ⅲ) could reduce the cellular antioxidase gene expression at high levels. 相似文献
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INTRODUCTIONHarmonicimaging (HI)isoneofthemostimportantultrasoundimagingproceduresdevel opedrecently,differingfromfundamentalimag ing (FI)bytransmittingultrasoundatonefre quencyandreceivingitattwoormoretimesthetransmittedfrequency .Clinicalapplicationshad… 相似文献
6.
This contribution deals with the adoption and interpretation of the monitorial system of education in Colombia between 1821 and 1844, a period during which this pedagogical method was almost mandatory for all the country’s elementary schools. The analysis focuses on the differences between “local necessities” and “local semantic resources” in the interpretation and adoption of the method. The author shows that whereas its implementation in Colombia was closely related to the construction of a new, independent and republican political order, many practices and interpretations reveal astonishing similarities to the history of the method in Spain. These similar features are illustrated at the level of curriculum, teaching practices and educational knowledge. The author discusses how these continuities marked the reception of the method even though the cultural relations between Spain and Colombia were strongly weakened during this time. This fact is interpreted in terms of the persistence of a Hispanic American cultural semantics, which pervaded the circulation and appropriation of purportedly universal educational models. 相似文献
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This article examines how education unfolded as a science in Estonia in the period 1944–1991, i.e. from the second Soviet occupation to the fall of the USSR. Historical analysis of the way prominent scholars and institutions succeeded in overcoming the adverse conditions of that period is conducted by viewing their respective contributions through two theoretical lenses: cultural trauma theory to explore the adversities they had to contend with, and resilience theory to explain how those challenges were overcome. Through these means an account is constructed of how individuals and institutions succeeded in preserving the national Estonian and inter-war European legacy of educational philosophy, in the process confronting and countering adverse socio-cultural-political conditions. 相似文献
8.
Filiz Meşeci Giorgetti 《Paedagogica Historica: International Journal of the History of Education》2014,50(1-2):42-58
This study has two purposes: the first is to present the general condition of public education in the late nineteenth and early twentieth centuries by showing the reformation process in educational institutes and teacher training, and the relationship between this process and the New Education movement in the Ottoman Empire; the second is to determine to what extent Mustafa Sat? Bey, often referred to as the Pestalozzi of the Ottoman Empire, contributed to the New Education movement through the analysis of his opinions on education, and his attempts to open a New School. As a result of Mustafa Sat? Bey’s analysis, New Education practices in the Ottoman Empire were stated to be practising a unilateral receiving-and-adapting procedure and the Ottoman Empire was positioned at the periphery in terms of the circulation of the movement. In his New School and in the Teacher Training School, Sat? Bey was concerned with the New Education movement both on an administrative and operative level. However, his practices were not sufficient to create his own theory and examine any other theory. Thus, when evaluated in terms of his contributions to the New Education movement, Sat? Bey is positioned somewhere between practical reformer and practitioner. 相似文献
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1IntroductionSince a non-noble bulk metallic glassy alloy was dis-covered byInoue ,et al.[1]in 1988 , many stable amor-phous alloy systems with higher glass-forming abilityand lower critical cooling rates have been developed .Among them, Zr-based metallic glassy alloys are in-tenselyinvestigated because of their wider supercooledliquid region and other favorable thermodynamic andmechanical properties .In general ,surface morphologyof amorphous alloy parts is veryi mportant forindustri-al and … 相似文献
10.
许承德 《上海大学学报(英文版)》2005,(4)
1IntroductionIn general,we followthe notation and terminologyin Refs.[1-5,7].In this paper all graphs are si mple.LetGbe a graph,V(G)the vertex set ofG,andE(G)the edge set ofG.The distance between twoverticesx,y∈V(G)is denoted bydG(x,y).Thediameter ofGis denoted byd(G).A short(x,y)-pathis an(x,y)-path with length≤d(G).An edgee∈E(G)is called cyclic if there exists a cycle inGcontaininge.To each cyclic edgee,letg(e)be thelength of the shortest cycle containinge.Ifeis abridge theng(e)… 相似文献
11.
Some laboratory diffusion tests were conducted with diffusion device to determine the diffusion coefficient of Cr(Ⅵ) ion passing through Dalian red clay samples. The concentrations of Cr(Ⅵ) at different places of the samples were then measured spectrophotometrically after a standing time of 1 000 d. A one-dimensional solute transport equation was used to simulate the transport of Cr(Ⅵ) through clay samples. Back-calculation of diffusion coefficient of Cr(Ⅵ) was made with finite difference method. Parametric... 相似文献
12.
1949年10月1日,毛泽东在天安门广场上庄严地宣布中华人民共和国成立。毛泽东任国家主席,周恩来任政务院总理。 相似文献
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《英语大王(小学)》2003,(9)
作为伦敦市的标志以及英国的象征,大本钟巨大而华丽,重13.5吨, 四个钟面的面积有两平方米左右。大本钟从1859年就为伦敦城报时,至今将近一个半世纪,尽管这期间大本钟因两度裂开而重铸,但现在大本钟的钟声仍然清晰、动听。 相似文献
14.
Confucius reinvented the concept of Junzi （君子）, an idea of personhood which invites continual assessment whether the concerns people were once devoted to are worthy of ongoing devotion, and how they make a place in the world—a place where they hope they can exercise some governance in their lives. Junzi （君子）is a agent, and has the properties and powers to monitor their lives, and to contribute to societal transformation. Cultivating a person is centrally involved in the politics of subjectivity, in forming and constituting the self because self always reflects the bounds and conventions of its history. The term Junzi （君子）is harnessed to make the individual a significant element for the state through the exercise of a form of power. So this kind of self-mastery incorporates notions of governmentality, freedom and the historical–social context to understandings of the self. So if we understand that the essence of civil society consists in agency-building self-transformation, there is ample evidence that Confucius was committed to reconstructing moral agency and civil society in a way that would be characteristically Confucian. Junzi (君子) is the case in point. 相似文献
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Emmy M.Keko 《海外英语》2011,(9):391-392
The purpose of this paper is to identify and map trends in the Eastern Highlands bilum fashion industry(in a global context) and,through the application of traditional bilum art,establish strategies that could be employed by Eastern Highlands small and medium bilum fashion loopers in response to the move toward a wider awareness,growth and promotion of bilum fashion.It also seeks to contribute to address a deficiency in the literature concerning indigenous bilum wear,a fashion through the process of native looped art,especially what if anything is excluded in the interpretations of non-indigenous researchers with regard to bilum wear arts. 相似文献
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Visitor(参观者):Toenjoy good health(健康),you must try your best towipe out(消灭)mosquitoes.Farmer(农场主):You'reright,sir. 相似文献
19.
Monica McLean Andrea Abbas Paul Ashwin 《British Journal of Sociology of Education》2013,34(2):262-280
This paper illustrates how critical use of Basil Bernstein's theory illuminates the mechanisms by which university knowledge, curriculum and pedagogy both reproduce and interrupt social inequalities. To this end, empirical examples are selected from the findings of the ESRC-funded project ‘Pedagogic Quality and Inequality in University First Degrees' (RES-062-23-1438, November 2008–January 2012). The project investigated sociology-related social science degrees in four social science departments in universities in different positions in influential UK higher education league tables. A Bernsteinian lens throws fresh light on how university education might contribute to a more egalitarian society. 相似文献
20.
Listening to ‘the thick bunch’: (mis)understanding and (mis)representation of young people in jobs without training in the South West of England 总被引：1，自引：0，他引：1
Young people in jobs without training are ubiquitous but invisible, working in shops, cafes, and other low‐waged, low‐status occupations. Commonly elided with young people who are not in education, employment or training, they are positioned as the ‘thick bunch’ with empty and meaningless working lives. The main purpose of the research was to explore the experiences of this group of marginalised and socially disadvantaged young people through a deeper understanding of their interests and enthusiasms inside and outside work. These young people have been (mis)understood and (mis)represented. A more holistic and nuanced approach that is not uncritically founded upon a set of neo‐liberal stereotypes and assumptions, and instead recognises the complexity of their lives, would offer new opportunities for understanding and representation of their interests. Our findings challenge the conflation of identity with work and the notion that only certain forms of employment create meaning. 相似文献