Pre-Viking and Early Viking Age Ribe: Excavations at Nicolajgade 8, 1985–86

Pre-Viking and Early Viking Age Ribe: Excavations at Nicolajgade 8, 1985–8

The Dating of Ribe's earliest Culture Layers

The Dating of Ribe's earliest Culture Layer

Stable Isotope Enrichment (Δ¹⁵N) in the Predatory Flower Bug (<i>Orius majusculus</i>) Predicts Fitness-Related Differences between Diets

Mass rearing of insects, used both as biological control agents and for food and feed, is receiving increasing attention. Efforts are being made to improve diets that are currently in use, and to identify alternative diets, as is the case with the predatory flower bug (Orius majusculus) and other heteropteran predators, due to the high costs of their current diet, the eggs of the Mediterranean flour moth (E. kuehniella). The assessment of alternative diets may include measurements of the predator&rsquo;s fitness-related traits (development time, weight, etc.), and biochemical analyses such as lipid and protein content in the diet and the insects. However, assessing diet quality via the predator&rsquo;s fitness-related traits is laborious, and biochemical composition is often difficult to relate to the measured traits. Isotope analysis, previously used for diet reconstruction studies, can also serve as a tool for the assessment of diet quality. Here, the variation in discrimination factors or isotope enrichment (&Delta;15N and &Delta;13C) indicates the difference in isotopic ratio between the insect and its diet. In this study, we investigated the link between &Delta;15N and diet quality in the predatory bug Orius majusculus. Three groups of bugs were fed different diets: Ephestia kuehniella eggs, protein-rich Drosophila melanogaster and lipid-rich D. melanogaster. The isotopic enrichment and fitness-related measurements were assessed for each group. Results show a relation between &Delta;15N and fitness-related measurements, which conform to the idea that lower &Delta;15N indicates a higher diet quality

Strain restricted typing sera for the use in the genetic monitoring of inbred strains of mice and rats from two danish SPF breeders

Strain restricted typing sera (SRTS) were produced for some of the most used inbred mouse and rat strains in Denmark by injecting lymphocytes pooled from several different strains intraperitoneally into the recipients. The SRTS were combined with a complement dependent cytotoxieity assay. It was possible to distinguish animals from strains with different MHC haplotypes but not animals from strains with the same MHC haplotype. It was concluded that the SRTS eomhined with a&nbsp; complement dependent cytotoxicity assay could distinguish between some of the most commonly used inbred strains of rats and mice in Denmark