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排序方式: 共有241条查询结果,搜索用时 15 毫秒
1.
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
2.
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
3.
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
4.
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
5.
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
6.
7.
Glanemann B Hoelzle LE Wittenbrink MM 《DTW. Deutsche tier?rztliche Wochenschrift》2002,109(12):528-529
In Switzerland clinical bovine paratuberculosis is registered sporadically with on average seven outbreaks per year. Our present studies are aimed to investigate the prevalence of Mycobacterium avium ssp. paratuberculosis (MAP)-infections in the Swiss cattle population and, therefore methods to culture MAP from bovine feces as well as a commercially available ELISA to detect MAP-specific antibodies are evaluated by using fecal samples and blood sera from herds with cases of clinical paratuberculosis. A series of molecular methods i.e. PCR-coupled RFLP analysis of the IS1311-insertion element of M. avium, PCR-coupled RFLP-analysis of the mycobacterial rpoB-gene, and DNA analysis of the mycobacterial 16S rRNA gene are used to identify mycobacterial isolates grown from bovine feces. Up to now, MAP was detected by culture in 12 of 155 (7.7%) animals from herds with paratuberculosis. A rather striking result is the finding of atypical mycobacteria in feces of 75 cattle (48.3%). Among these isolates, M. avium ssp. avium, M. thermoresistibile, and M. hassiacum/M. buckleii have been identified so far. 相似文献
8.
Sven Buchholz Peter Neumann Katharina Merkel H. Randall Hepburn 《Journal of pest science》2006,79(4):251-254
Small hive beetles, Aethina tumida Murray, are parasites and scavengers of honeybee colonies, Apis mellifera L., and have become an invasive species that can cause considerable damage in its new distribution areas. An effective subspecies of Bacillus thuringiensis Berliner (=Bt) would provide an alternative to chemical control of this pest. Therefore, we tested three different Bt strains [B. thuringiensis, var. aizawai (B401®), B. thuringiensis var. kurstaki (Novodor®) and B. thuringiensis var. San Diego tenebrionis (Jackpot®)] and Perizin® (3.2% coumaphos), each applied on combs with a pollen diet fed to pairs of adult beetles. This evaluates the products for the suppression of successful small hive beetle reproduction. While none of the tested Bt strains showed a significant effect on the number of produced wandering larvae, we could confirm the efficacy of coumaphos for the control of small hive beetles. We further show that it is also efficient when applied with a lower concentration as a liquid on the combs. We suggest the continued search for efficient Bt strains naturally infesting small hive beetles in its endemic and new ranges, which may become a part of the integrated management of this pest. 相似文献
9.
Surface Electromyography of the Vastus Lateralis,Biceps Femoris,and Gluteus Medius Muscle in Sound Dogs During Walking and Specific Physiotherapeutic Exercises 下载免费PDF全文
10.
Rebecca A. Gilday Chris Wojnarowicz Kimberly A. Tryon Katharina L. Lohmann 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(3):257-260
A Canadian warmblood foal treated for septic polyarthritis was diagnosed with bilateral congenital renal dysplasia, hydronephrosis, and hydroureter at 2 weeks of age based on abdominal ultrasound and postmortem examination. Intermittent abdominal pain throughout the course of treatment was attributed to hydronephrosis and hydroureter. 相似文献