Phase transitions of pea starch over a wide range of water content

The phase transitions of pea starch over a wide range of water content were investigated by differential scanning calorimetry (DSC). Swelling of starch granules increased progressively with increasing water content. The main endotherm G broadened progressively with increasing water content up to 94.5 wt % (water:starch ratio 15:1), above which it became too broad to define. The corresponding peak and conclusion temperatures and enthalpy change increased with increasing water content. Scanning electron microscopy (SEM) showed that, at a water:starch ratio of 2:1 (water content of 70.7 wt %), starch granules only swelled partially with discernible granular contours still clearly evident. The results of swelling power tests and SEM images revealed that the endotherm G obtained at a water:starch ratio of 2:1 represented only partial swelling of starch granules. The transition from a narrow to broad endotherm G was interpreted to reflect the thermal transition behavior progressing from limited swelling to maximum swelling and then partial dissolution and leaching of starch polymers from the granules.     

Barberry plays an active role as an alternate host of Puccinia graminis in Spain

Stem rust, caused by Puccinia graminis, is a destructive group of diseases. The pathogen uses Berberis species as alternate hosts to complete its life cycle. B. vulgaris and the endemic species B. hispanica and B. garciae are present in Spain. The objective of this study was to investigate the functionality of the indigenous barberry as alternate hosts. Field surveys were conducted in 2018 and 2019 in Huesca, Teruel and Albacete provinces of Spain. Aecial samples on barberry were analysed via infection assays and DNA analysis. B. garciae was predominant in Huesca and Teruel provinces, often found in the field margins of cereal crops. Aecial infections on B. garciae were observed in May and uredinial infections on cereal crops in June. Scattered B. hispanica bushes were occasionally found near cereal crops in Albacete, where aecial infections on B. hispanica were observed in June when most cereal crops were mature. Infection assays using aeciospores resulted in stem rust infections on susceptible genotypes of wheat, barley, rye and oat, indicating the presence of the sexual cycle for P. graminis f. sp. tritici, f. sp. secalis and f. sp. avenae. Sequence analyses from aecial samples supported this finding as well as the presence of Puccinia brachypodii. This study provides the first evidence that indigenous Berberis species play an active role in the sexual cycle of P. graminis under natural conditions in Spain.     

How biotechnology regulation sets a risk/ethics boundary

In public debate over agricultural biotechnology, at issue hasbeen its self-proclaimed aim of further industrializingagriculture. Using languages of risk, critics and proponentshave engaged in an implicit ethics debate on the direction oftechnoscientific development. Critics have challenged thebiotechnological R&D agenda for attributing socio-agronomicproblems to genetic deficiencies, while perpetuating the hazardsof intensive monoculture. They diagnosed ominous links betweentechnological dependency and tangible harm from biotechnologyproducts.In response to scientific and public concerns, theEuropean Community enacted precautionary legislation for theintentional release of genetically modified organisms (GMOs). Inits implementation, choices for managing and investigatingbiotechnological risk involve an implicit environmental ethics.Yet the official policy language downplays the inherent valuejudgments, by portraying risk regulation as a matter ofobjective science.In parallel with safety regulation, thestate has devised an official bioethics that judges where todraw the line in applying biotechnological knowledge, as ifthe science itself were value-free. Bioethics may also judge howto balance risks and benefits, as if their definition were notan issue. This form of ethics serves to compensate for theunacknowledged value-choices and institutional commitmentsalready embedded in R&D priorities.Thus the state separatesrisk and ethics, while assigning both realms to specialists.The risk/ethics boundary encourages public deference to theexpert assessments of both safety regulators and professionalethicists. Biotechnology embodies a contentious model of controlover nature and society, yet this issue becomes displaced andfragmented into various administrative controls. At stake arethe prospects for democratizing the problem-definitions thatguide R&D priorities.     

加拿大食品及消费安全行动计划

加拿大食品检验署成立于1997年,是国内最大的联邦科学管理机构,将所有联邦检验工作统一到一个机构负责,以保证加拿大的食品供给和动植物的安全和质量;实施多种方案,对整个食品生产环节进行管理.