Chemical engineering viewed historically     

Beer JJ 《Science (New York, N.Y.)》1982,217(4561):723

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Analysis of archive samples of spring and winter barley support an increase in individual Fusarium species in Bavarian barley grain over the last decades     

Hofer  Katharina  Hückelhoven  Ralph  Hess  Michael 《植物病害和植物保护杂志》2019,126(3):247-254

Journal of Plant Diseases and Protection - A broad range of different Fusarium (F.) species is associated with Fusarium head blight (FHB) on barley and the corresponding negative effects in...  相似文献   

Impact of a treatment with phospholipase A2 on the physicochemical properties of hen egg yolk     

Daimer K  Kulozik U 《Journal of agricultural and food chemistry》2008,56(11):4172-4180

Changes in physicochemical properties of egg yolk were investigated after a treatment with phospholipase A 2 (PLA 2), where phospholipids are converted in lyso-phospholipids. Protein solubility and protein denaturation before and after modification by PLA 2 was monitored as well as the functionality of egg yolk by means of interfacial tension. Enzymatic treatment showed a significant impact on the properties of egg yolk with regard to protein solubility and denaturation behavior. To gain a closer insight, egg yolk was separated in its water-soluble fraction called plasma and the insoluble granules. Both fractions were separately modified by PLA 2. The granule fraction shows a higher protein solubility, and the plasma proteins show very high heat stability after modification by PLA 2. Hypotheses regarding related changes in the low-density lipoprotein (LDL) particles are discussed. Results suggest that significant differences in the functional properties of untreated and PLA 2-modified egg yolk do not primarily result from the existence of lyso-phospholipids but from structural changes in egg yolk granules and LDL particles.  相似文献   

Extinction and ecosystem function in the marine benthos     

Solan M  Cardinale BJ  Downing AL  Engelhardt KA  Ruesink JL  Srivastava DS 《Science (New York, N.Y.)》2004,306(5699):1177-1180

Rapid changes in biodiversity are occurring globally, yet the ecological impacts of diversity loss are poorly understood. Here we use data from marine invertebrate communities to parameterize models that predict how extinctions will affect sediment bioturbation, a process vital to the persistence of aquatic communities. We show that species extinction is generally expected to reduce bioturbation, but the magnitude of reduction depends on how the functional traits of individual species covary with their risk of extinction. As a result, the particular cause of extinction and the order in which species are lost ultimately govern the ecosystem-level consequences of biodiversity loss.  相似文献   

Contaminant and formulation analysis of MSMA using high-pressure liquid chromatography — graphite furnace atomic absorption spectrophotometry     

Frans E. Pick  Pieter R. De Beer  Susan M. Prinsloo  Louis P. Van Dyk 《Pest management science》1987,21(1):45-49

High-pressure liquid chromatography with an ion-exchange column combined with graphite furnace atomic absorption spectrometry was used to analyse commercial formulations of sodium hydrogen methylarsonate (MSMA). No arsenite or arsenate salts or dimethylarsinic acid were detected as contaminants in the formulations, and the MSMA concentrations were found to be in accordance with the concentrations given on the containers.  相似文献   

Clinical trichuriasis produced experimentally in growing pigs. I. Pathology of infection   总被引：1，自引：0，他引：1  

R J Beer  I J Lean 《The Veterinary record》1973,93(7):189-195

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Memorial to lehrman     

Beer CG 《Science (New York, N.Y.)》1976,192(4240):678

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Palaeoparasitological analysis of guinea pig mummies of the Chiribaya culture,Moquegua Valley,Peru     

Dittmar de la Cruz K  Ribbeck R  Daugschies A 《Berliner und Münchener tier?rztliche Wochenschrift》2003,116(1-2):45-49

During several excavations of archeological sites in the Moquegua Valley, Southern Peru, various guinea pig mummies (Cavia aperea f. porcellus) have been discovered. They belong to the Chiribaya Culture (900-1100 AD). The outstanding preservation of the mummified animals gave rise to the idea of a paleoparasitological analysis. In the fur, numerous well preserved ectoparasites (lice, fleas, mites) could be recovered. Generally, ectoparasite remains are rarely found among archeological material. This is the first account of an extensive ectoparasitological analysis of animal mummies in Peru. A modified technique for recovery and preservation of the ectoparasites has been developed.  相似文献   

Molecular characterization of Listeria monocytogenes and the significance for food hygiene     

Wagner M  Hein I  Grif K  Sumerkan AB  Esel D  Allerberger F 《Berliner und Münchener tier?rztliche Wochenschrift》2003,116(11-12):460-466

Research on the pathogen Listeria monocytogenes is a key issue both for the clinical and the food microbiologist owing to the unique pathway of infection and the exposure of humans via contaminated foods. Although, in Austria, the incidence of listeriosis is about 870-fold lower than the incidence for Salmonella infection, the food law manages both foodborne pathogens with a comparable stringency. The current risk management is based on the assumption that environmental L. monocytogenes isolates, from which the pool of "foodborne" isolates is recruited, are of similar pathogenicity compared to clinical and outbreak isolates. This verdict became doubted in the recent years. Characterization of L. monocytogenes by virulence gene sequencing, virulence studies in vivo and in vitro and by molecular typing was considerably stimulating the discussion on virulence variability in L. monocytogenes. This article provides insights in the value of epidemiological follow-up studies by presenting a typing study on 15 cases of listeriosis observed in a district hospital in Turkey. Furthermore results from typing L. monocytogenes either by virulence gene sequencing, mismatch amplification mutation assay or by pulsed field gel electrophoresis are discussed. The close interaction of molecular microbiology with food microbiology both in applied and basic science is currently creating a new discipline of molecular food microbiology. We are convinced that veterinary medicine will contribute to this exiting development in a fruitful way.  相似文献   

A review of approaches to quality assurance of veterinary systems for health-status certification     

Stärk KD  Salman M  Tempelman Y  Kihm U 《Preventive veterinary medicine》2002,56(2):129-140

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