Harvests of shame: enduring unfree labour in the twentieth-century United States, 1933–1964

This article reframes the discussion on vulnerable and exploited agricultural labour in twentieth-century United States using the overarching category of unfree labour. In order to do so, it bridges two usually distinct historiographies by linking the phenomenon of ‘peonage’ during the New Deal, with the one of immigrant contract labour in southern Florida, under the H2 visa. Archival research on the practices at the U.S. Sugar Corporation in southern Florida illustrates this link. The article draws on Federal archives, U.S. Government proceedings, papers of political activists and legal and labour scholarship to argue: firstly, that unfree labour has been an enduring feature of agricultural labour relations at regional level during the twentieth century, through both a transmission and a transformation of practices that had their origin in the control of black emancipated labour; secondly, that the introduction of `guest workers’ under the H2 and Bracero programme meant a modernisation in the practices of unfree labour, pivoting on the lack of citizenship rights, racial discrimination, debt at home and threat of deportation; and, finally, that the failure to recognise forms of legal and economic deprivation and coercion as unfree labour has hurt the ability of the United States to enforce protection of human rights at home.     

重组鸡白细胞介素6对不同种类疫苗的免疫增强作用

为评价重组鸡白细胞介素6(rChIL-6)在商品鸡体内对不同种类疫苗的免疫增强作用,采用不同接种方式,应用rChIL-6分别对不同种类新城疫病毒(NDV)单联疫苗和新城疫病毒-传染性支气管炎病毒-禽流感病毒H9亚型三联疫苗(NDV-IBV-H9)进行了免疫增强试验以及传染性法氏囊病病毒(IBDV)单联油乳剂灭活疫苗的免疫增强田间试验,并进行了将rChIL-6与NDV Ⅳ系预混合乳化制备成的灭活疫苗的免疫试验.结果表明,将rChIL-6与NDVⅣ系、Ⅰ系活疫苗预混合后分别采用滴鼻点眼、肌肉注射接种方式的免疫增强效果优于其他方式;rChIL-6与NDV抗原预混后制备成油乳剂灭活疫苗的免疫增强效果优于将相同抗原量的NDV油乳剂灭活疫苗和rChIL-6同时分点免疫接种.rChIL-6对NDV油乳剂灭活疫苗的免疫增强效果优于活疫苗,对NDV单联灭活疫苗的免疫增强效果优于NDV-IBV-H9三联灭活疫苗.田间试验表明,rChIL-6对IBDV油乳剂灭活疫苗首免和二免都具有显著的免疫增强作用,二免的免疫增强效果优于首免.这些研究结果为进一步开展新型鸡基因工程免疫增强剂研究奠定了基础.     

成人肾脏ABO组织血型1-4型糖链H物质的分布

目的观察1型H、2型H及3/4型H糖链在成人肾组织中的分布及其与分泌状态的关系。方法 应用抗ABO抗体及3种糖链特异的单克隆抗H抗体的免疫组织化学方法,检查分泌型与非分泌型个体肾组织中相应抗原物质的分布。结果 在分泌型和非分泌型人的肾远曲小管均表达2型H和3/4型H物质,1型H和3/4型H物质只在分泌型人肾集合管表达,在非分泌型人中不表达。另外集合管的2型H物质的表达与分泌状态无关。结论 人肾组织有ABH物质的表达,不同肾组织细胞表达的H物质结构差异与AB0型分泌状态有关。     

Get in line: Do part-time legislatures use sunset laws to keep executive agencies in check

Sunset provisions are clauses embedded in legislation that cause a piece of legislation or a regulatory board to expire on a certain date unless the legislature takes affirmative action to renew the legislation or board. Supporters and legislators offer several reasons why sunset laws are valuable and useful. An article by Baugus and Bose (2015), reported on the king-and-council model of Congleton (2001), suggests that sunset laws are a key tool legislatures use in asserting themselves against an executive branch that often dominates state government. We investigate this possibility using empirical analysis, which suggests that part-time legislatures, specifically, a form of part-time legislature referred to as hybrid legislatures, are more prone to use sunset legislation as a tool to keep the executive preferences in check.     

小反刍兽疫病毒H糖蛋白基因原核表达载体的构建及表达

参照GenBank中小反刍兽疫病毒(PPRV)H抗原基因序列,人工合成了PPRV H基因,将其克隆至pUC18-T质粒中,转化E.coliJM109感受态细胞,构建并选择PPRV H基因克隆重组质粒,经核苷酸序列分析正确,将其克隆至pBAD/Thio-TOPO载体中,转化E.coliTOP10感受态细胞,核苷酸序列分析证实,成功构建了PPRV H基因重组表达载体。经不同浓度L-阿拉伯糖诱导,可稳定、高效地表达PPRV H抗原。SDS-PAGE分析结果表明,用终浓度为0.2 g/L的L-阿拉伯糖诱导5 h的表达量最高,表达蛋白为分子质量约83 ku的融合蛋白;经薄层扫描分析,其表达产量约占菌体总蛋白的10%。Western-blotting检测表明,诱导的蛋白能与PPRV H蛋白单抗发生特异性反应,说明表达的融合蛋白中含有PPRV H糖蛋白抗原。     

过氧化氢诱导PC12细胞损伤的模型的建立

目的建立不同浓度的H2O2诱导PC12细胞凋亡的模型,研究组织缺血、自由基损伤的机制。方法分别以不同浓度的H2O2处理PC12细胞12h,用噻唑蓝(MTT)比色法和流式细胞术检测处理后细胞的生长活力和凋亡情况。结果以0浓度组作为对照,100、300nmol/L的H2O2处理的PC12细胞生存率分别为(76±7.69)%、(39±7.08)%(P<0.01);0、100、300nmol/L的H2O2处理的PC12细胞后凋亡率分别为2.47%、6.00%和55.54%。结论建立了以0、100、300nmol/L的H2O2诱导PC12细胞凋亡的模型。     

Dialectics and Transformation: Exploring the International Theory of E. H. Carr

This article examines the appeal of Carr's theory of international relations, which has enjoyed a longevity matched by few other bodies of work in a discipline characterised by faddism. I attribute Carr's success as an international theorist to his subtle use of philosophy, history, and political theory. Carr's holistic and interdisciplinary approach achieves its best expression in his employment of a critical dialectics of international theory in The Twenty Years' Crisis. The article does not confine itself to this element of Carr's writings as I also examine several works, such as The Future of Nations. Independence or Interdependence?, Conditions of Peace, and Nationalism and After,that consider the transformation of the international society. The latter works also employ a dialectic of power and morality in order to envision a world very different from the international system that Carr observed, an international order that approximates the emerging relations among states at the beginning of the twenty-first century. The article concludes with an examination of the role relativism played in Carr's theory scheme and the extent to which his dialectics of utopianism and realism is an important precursor of critical and postmodern theories of international relations.     

Do Industrial Tax Abatements Spur Property Value Growth?

Despite ongoing debate regarding the effectiveness of tax abatements, Michigan's Industrial Facilities Tax (IFT) abatement program has been widely and extensively used to boost local economic development. In this article, we estimate the effects of industrial property tax abatements on industrial, residential, and commercial property value growth in the context of regional competition for a panel of 152 communities in the five counties surrounding Detroit from 1983 through 2002. We find that: (1) offering tax abatements yields statistically significant positive impacts on industrial property value growth; (2) the impacts are larger in high tax than in low tax communities; (3) there are positive spillover effects of industrial tax abatements on residential and commercial property value growth; (4) tax abatements offered in competitor communities do not appear to influence own industrial property value growth; and (5) changes in the own as well as competitor property tax rates are important determinants of industrial property value growth. However, the fiscal benefits of tax abatements are quite small as compared with the costs of offering abatements even when spillover benefits to residential and commercial properties are considered.     

T.H. Marshall and his critics: reappraising ‘social citizenship’ in the twenty-first century

T.H. Marshall's concept of ‘social citizenship’, developed in the 1949 lecture ‘Citizenship and Social Policy’, remains a vital study of welfare in developed nations. However, Marshall's social citizenship has come under attack as undermining civil liberties, or falling short of offering real equality to marginalised groups. This article returns to Marshall's lecture to show that he was in fact aware of such problems, but nonetheless held the provision of social rights to be a valuable normative project. Furthermore, this article argues that a new social citizenship, incorporating collective rights claims, could present a strong challenge to neoliberalism in contemporary welfare debates.     

Quantified Explosives Transfer on Surfaces for the Evaluation of Trace Detection Equipment

Trace explosive test surfaces are often required for the evaluation of trace detection equipment to determine the equipment performance. Test surfaces of C‐4, Detasheet, Semtex‐H, TNT, and HMTD were prepared by transferring trace amount of explosive deposited on polytetrafluoroethylene (PTFE) transfer strips onto different surfaces (Kraft paper, hard plastic, woven fabric, and soft vinyl). The amount of explosive transferred was deduced from the amount of explosive remaining on the PTFE strips after transfer, as quantified by direct analysis using tandem mass spectrometry with thermal desorption. From the data set of over 2000 transfers, we experienced lower transfer efficiency for Semtex‐H and Detasheet, and for soft vinyl and hard plastic. However, the rapid quantification mass spectrometric method allowed the transfer efficiency to be determined for all test surfaces used in an evaluation of trace explosive detectors, thereby permitting only the test surfaces with desired transfer to be accepted for the assessment.