K e y w o r d s : graphs, algori thms, HHD-free graphs, t reewidth, min imum fill-in. MSC: 68R10. 1 I n t r o d u c t i o n A graph is HHD-free if it does not contain a house (i.e., the complement of Ps), a hole (Ck for k _> 5) or a domino (see Figure 1). Fig. 1. 'House' (left), 'hole' (middle) and 'domino' (right) * kloks@math, utwente, nl

Comparative Toxicity of Seventeen Pesticides to the Quelea, House Sparrow, and Red-Winged Blackbird. SCHAFER, E. W., JR., BRUNTON, R. B., LOCKYER, N. F. AND DE GRAZIO, J. W. (1973). Toxicol. Appl. Phurmacol. 26, 154-157. The acute po LD5,, values of 17 commercial or experimental pesticides were determined for quelea (Quelea quelea), house sparrows (Passer domesticus), and red-winged blackbirds ...

We study the structure of an optimal management for innovative activities. The top management of a buyer hires a supplier for production. The production e¢ ciency can be enhanced by investing in R&D before production. The buyer chooses between using its own subunit for the R&D, or outsourcing the task to the supplier (integration of R&D and production). Our analysis reveals that (i) when the R&...

This study was performed to evaluate the accuracy, validation and applicability of UV spectrophotometer (UV), Ion Chromatography (IC), and Detector tube (DT) methods for measuring ammonia (NH3) concentration in a swine confinement house and swine slurry storage tank. The mean values of NH3 emitted from the house and slurry were 5.333 ppm and 42.192 ppm for the IC method; 4.13 ppm and 36.29 ppm ...

A simple, non-isotopic in-house enzyme-linked immunoabsorbant assay (ELISA) for human growth hormone (GH) was developed. The assay involved using in-house polyclonal anti-GH adsorbed onto 96-well microtitre plates, commercially prepared mouse monoclonal anti-GH, and goat anti-mouse IgG horseradish peroxidase detection system. Results of recovery and parallelism studies ranged from 95%-106% and ...

Serum levels of total IgE, specific IgE, IgG and IgG4 against house dust mite were measured in mite-sensitive asthma patients receiving immunotherapy with house dust. Serum levels of total IgE, mite specific IgE and IgG did not significantly change during the course of hyposensitization. Increased levels of mite specific IgG4 were observed in patients during immunotherapy. The increase in speci...

PURPOSE The purpose of this study was to analyze the cutaneous sensitivity to a variety of allergens in patients with vernal keratoconjunctivitis (VKC) and to demonstrate the relation between skin response and clinical aspects of the disease. METHODS Twenty patients with vernal keratoconjunctivitis were randomly chosen from the External Disease and Cornea Sector. They were clinically evaluate...

Based on an industry-level data set for Chinese largeand medium-size manufacturing enterprises over the period of 1996–2006, the paper investigates the impacts of three technology acquisition channels, i.e. in-house R&D, foreign technology transfer and domestic technology transfer, on the productivity growth by using both the output elasticity and the rate of return methods. We find that in-hou...