794 research outputs found
Tropane alkaloids in food
A large number of wild and cultured plants produce secondary metabolites that are toxic to humans and animals. Through accidental or intentional mixing of these plants with normal food and feed the consumers of these products will be exposed to the toxins. In this report tropane alkaloids will be discussed
Mycotoxins: Risks, regulations and European co-operation
Mycotoxins and mycotoxicises have been problems of the past and the present,
but scientific attention for mycotoxins did not start until the early 1960’s.
Nowadays, many mycotoxins are known, and their occurrence in food and animal
feed may cause various adverse effects on human and animal health, including
carcinogenic, hepatotoxic, immunotoxic, nephrotoxic, neurotoxic, oestrogenic
and teratogenic effects. Some important mycotoxins include the aflatoxins,
ochratoxin A, the fumonisins and the trichothecenes, and their significance
is briefly described. To protect human and animal health, many countries have
enacted specific regulations for mycotoxins in food and animal feed. Risk
assessment is a major factor for scientific underpinning of regulations, but
other factors such as availability of adequate sampling and analysis
procedures also play an important a role in the establishment of mycotoxin
regulations. In addition, socio-economic factors such as cost-benefit
considerations, trade issues and sufficiency of food supply are equally
important in the decision-taking process to come to meaningful regulations.
Nowadays, more than 100 countries have formal mycotoxin regulations for food
and feed. The mycotoxin regulations are the most stringent in the EU, where
various organizations and pan-European networks contribute to combat the
mycotoxin problem. It is to be expected that mycotoxins will stay with us in
the future and climate change might have a negative influence in this
respect. Several possibilities exist to mitigate the problems caused by
mycotoxins. In particular prevention of mould growth and mycotoxin formation
is key to the control of mycotoxins
Some remarks on the spectral functions of the Abelian Higgs Model
We consider the unitary Abelian Higgs model and investigate its spectral
functions at one-loop order. This analysis allows to disentangle what is
physical and what is not at the level of the elementary particle propagators,
in conjunction with the Nielsen identities. We highlight the role of the
tadpole graphs and the gauge choices to get sensible results. We also introduce
an Abelian Curci-Ferrari action coupled to a scalar field to model a massive
photon which, like the non-Abelian Curci-Ferarri model, is left invariant by a
modified non-nilpotent BRST symmetry. We clearly illustrate its non-unitary
nature directly from the spectral function viewpoint. This provides a
functional analogue of the Ojima observation in the canonical formalism: there
are ghost states with nonzero norm in the BRST-invariant states of the
Curci-Ferrari model.Comment: 32 pages, 12 figure
Trendanalyse dierlijke eiwitten in diervoeder(grondstoffen)
In dit rapport worden, in opdracht van de VWA, historische gegevens gebruikt om inzicht te krijgen in het voorkomen van dierlijke eiwitten (bestanddelen) in diervoeders en diervoedergrondstoffen. Dierlijke eiwitten in diervoeders spelen een belangrijke rol in het verspreiden van BSE (gekke koeien ziekte). Daarom zijn er maatregelen genomen om blootstelling van runderen aan dierlijk eiwit via het diervoeder te voorkomen. Er zijn diverse verboden en regels door de Europese overheid opgelegd en door de Nederlandse overheid (VWA) wordt toezicht gehouden op de naleving van deze regelgevin
Информационное обеспечение в процессно-ориентированной модели управления предприятиями
Приведено описание информационного обеспечения как составной части менеджмента производственного предприятия в его современном, процессном представлении. Информационное обеспечение предприятий связано с качеством функционирования, которое с точки зрения процессно-ориентированных стандартов характеризуется результативностью и эффективностью.It has been accomplished the description of data-ware as a component of manufacturing enterprise management in its modern process presentation. The data-ware of enterprise is connected with quality of functioning, which is defined by effectiveness and efficiency of the according process-oriented standards
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