New markets,old struggles: Large and small farmers in the export agriculture of coastal Peru

Although the output of high-value crops in Peru has increased during the era of ‘globalization’, producers still tend to contextualize this development in relation to the 1969 agrarian reform. Considered here is how large and small farmers in the Cañete region perceive the changes that have occurred in agriculture since a generation ago, with particular reference to market competition and the implications of the new economic conditions for environmental sustainability. Despite the fact that farmers located at each end of the rural hierarchy experience the economic impact of globalization differently, small cultivators exporting their produce to the international market being particularly vulnerable to its laissez faire regime, they nevertheless share a common belief in the importance of agriculture for the well-being of the nation. The latter, it is suggested, is a discourse that reproduces much of the ideology associated historically with the agrarian and foundation myths.     

Physiologic Responses to Racial Rejection Images Among Young Adults from African-American Backgrounds

Physiologic reactivity to racially rejecting images was assessed in 35 young adults (10 males, 25 female) from African-American backgrounds using the startle probe paradigm. In a laboratory setting, participants viewed 16 images depicting racial rejection, racial acceptance, nonracial negative, and nonracial positive themes. While viewing these images, startling bursts of noise were presented and the magnitude of the eyeblink responses were measured. Results supported an attentional mechanism which suggests that, while viewing both racially rejecting and nonracial positive images, individuals may be so absorbed in processing the images that they appear less distracted by the startling noise. However, these patterns were only found for participants low in racial regard. Young adults who felt positively about their racial background did not exhibit differential processing of startle stimuli as a function of slide themes. Race-rejection sensitivity did not moderate startle reactivity. Developmental implications, particularly in light of coping with racial discrimination, are discussed.

Ebola vaccines,evidentiary charisma and the rise of global health emergency research

Abstract

The 2013–2016 West African Ebola outbreak was both a catastrophic public health disaster and a rare research opportunity. This paper analyses how the tensions between the humanitarian imperatives of disease control and the epistemic conventions of bioscientific inquiry played out in the accelerated development, testing and licensure of Ebola vaccines. Beginning with the epidemiological projections of the disease’s spread, the paper develops the notion of evidentiary charisma to capture the power of experimental designs and data packages to marshal public health salience, recruit moral legitimacy and short-circuit scientific contestation. Attention to the charismatic dimensions of Ebola vaccine R&D helps to unpick the simultaneous appeals to exception and convention in the unfolding of a global health crisis, and to trace the normative and technical contours of the emerging paradigm of emergency research.     

Facts,power and global evidence: a new empire of truth

Abstract

What are the epistemological and political contours of evidence today? This introduction to the special issue lays out key shifts in the contemporary politics of knowledge and describes the collective contribution of the six papers as an articulation of what we describe as a ‘new empiricism’, exploring how earlier historical appeals to evidence to defend political power and decision-making both chime with and differ from those of the contemporary era. We outline some emerging empirical frontiers in the study of instruments of calculation, from the evolution of the randomized controlled trial (RCT) to the growing importance of big data, and explore how these methodological transformations intersect with the alleged crisis of expertise in the ‘post-truth’ era. In so doing, we suggest that the ambiguity of evidence can be a powerful tool in itself, and we relate this ambiguity to the ideological commitment and moral fervour that is elicited through appeals to, and the performance of, evaluation.     

利用aroA基因建立鸡传染性鼻炎PCR诊断方法

利用aroA基因设计了1对引物,分别对10株标准副鸡嗜血杆菌(HPG)菌株、14株分离的HPG菌株进行PCR扩增,结果均得到了与预期大小一致的片段,而对10株非HPG菌株和3株病毒进行扩增则无相应片段产生;该PCR能检测出10个菌细胞.与常规PCR方法相比,aroA-PCR的敏感性更高.