Water-soluble glycopeptides isolated from cultures of Ceratocystis ulmi have been reported to be toxins involved in Dutch elm disease. The influence of the glycopeptides on the water relations of Ulmus americana seedlings was tested by placing cut stems in glycopeptide preparations. After 4 hours in 200 micrograms per milliliter toxin the stem conductance of the seedlings was reduced by 79% and...

Dutch elm disease fungus Ophiostoma novo-ulmi contains a hydrolase activity which catalyses the resolution of racemic ethyl naproxen to the corresponding acid. The recombinant enzyme has been crystallized by the vapour-diffusion method in two crystal forms. The crystals of the first form belong to space group P2(1)2(1)2, with unit-cell parameters a = 115.9, b = 174.4, c = 62.1 A. The enzyme als...

The Efficient Parasite: DR. N. H. SWELLENGREBEL 465 Reports: The National Defense Research Committee .................. 484 The Kinetics of Contact Catalysis and the Industrial Background: DR. HUGH STOTT TAYLOR ........................... 469 Special Articles: a~Scientific Events:*~ +The Logistic Curve and the Census Count of 1940: Scientific Events: THE LATE PROFESSOR RAYMOND PEARL, DR. LOWELL...

Ophiostomatoid fungi were isolated from Scolytus ratzeburgi infesting Betula pendula and B. pubescens in Norway. Fungi were identified based on morphology, DNA sequence comparison for two gene regions and phylogenetic analyses. The most abundant fungus was Ophiostoma karelicum, suggesting a specific relationship between the fungus, the vector insect and the host tree. Our results suggest that O...

BERBEE, M. L., AND TAYLOR, J. W. 1992. 18s ribosomal RNA gene sequence characters place the human pathogen Sporothrix schenckii in the genus Ophiostoma. Experimental Mycology 16, 87-91. Using the sequence of the gene for the 18s subunit of ribosomal RNA, we show that the asexual human pathogen Sporothrix schenckii lies phylogeneticaily within the sexual genus Ophiostoma. By distance or maximum ...

Hepatitis is a disease which is seen at all levels of age. Hepatitis disease solely does not have a lethal effect, but the early diagnosis and treatment of hepatitis is crucial as it triggers other diseases. In this study, a new hybrid medical decision support system based on rough set (RS) and extreme learning machine (ELM) has been proposed for the diagnosis of hepatitis disease. RS-ELM consi...

Biological invasions have had profound effects on human society from the earliest times. The spread of the black death in the Middle Ages, the devastations of potato blight, the effects on indigenous species by grey squirrels, dutch elm disease and flatworms have all been seen as detrimental to man or the environment. Others are seen as bringing benefits: most of our crops evolved elsewhere in ...

Exotic forest pests cost China and the United States billions of dollars each year. Current regulatory systems worldwide are overwhelmed with the increasing volume of international trade. Trade in nursery stock, wood products, pallets and dunnage have proven the most common means of transport for exotic forest pests. Despite our best efforts, pests such as chestnut blight, gypsy moth, Dutch elm...