ABSTRACT
Tithonia diversifolia (Mexican sunflower) is a shrub commonly used as a green manure crop in Central and South America, Asia and Africa as it accumulates high levels of phosphorus and other nutrients, even in depleted soils. In root samples collected from the global distribution of Tithonia, we examined the degree of mycorrhizal colonisation and estimated the families of associated arbuscular mycorrhizal (AM) fungi. No colonisation by ectomycorrhizas was found. The degree of colonisation by AM fungi was on average 40%, but ranged between 0 and 80%. No mycorrhizal colonisation was found in the samples collected from the Philippines or in one each of the Rwandan and Venezuelan samples. Throughout its global distribution (Costa Rica, Nicaragua, Indonesia, Honduras, Mexico, Kenya and Rwanda), Tithonia forms mainly associations with Glomaceae. Only in one location in Nicaragua were associations with another family ( Acaulosporaceae) found.
Subject(s)
Asteraceae/microbiology , Mycorrhizae/physiology , Fungi/genetics , Fungi/physiology , Mycorrhizae/genetics , Phylogeny , Plant Roots/microbiology , Polymerase Chain ReactionABSTRACT
Forty molar and premolar teeth had non-retentive cavities prepared and restored with amalgam using (1) copal varnish (control), (2) a pin, (3) Amalgambond or (4) Panavia-Ex. The forces and energy required to dislodge the restorations were recorded and compared, and the mode of failure noted for each group. Although the pinned restorations required significantly higher loads to dislodge them, the mode of failure and energy required to dislodge the restorations in the Amalgambond and Panavia-Ex groups indicated that these types of restorations had significant advantages over pinned restorations, particularly where the pulp might be compromised. The film thickness of the retentive systems in these two groups, however, indicated a substantial operator or technique sensitivity.
Subject(s)
Adhesives/chemistry , Dental Amalgam/chemistry , Dental Bonding , Dental Restoration, Permanent , Resin Cements , Dental Bonding/methods , Dental Cavity Lining , Dental Materials/chemistry , Dental Pins , Dental Stress Analysis , Double-Blind Method , Humans , Lacquer , Materials Testing , Methacrylates/chemistry , Phosphates/chemistry , Resins, Plant , Resins, Synthetic/chemistry , Stress, Mechanical , Surface PropertiesABSTRACT
In this paper we outline the rationale for applying British Standard BS5750 to a medical equipment management service and introduce some of the concepts of the standard as they apply to this field. We see this application as essential in today's legal and commercial environment and indicate the ways in which this work is being carried forward by the Medical Equipment Management Organisation into total quality management systems.
Subject(s)
Materials Management, Hospital/standards , Equipment Safety , Management Information Systems , Quality Assurance, Health Care , Software , United Kingdom , User-Computer InterfaceSubject(s)
Cross Infection/prevention & control , Dentistry, Operative/instrumentation , Europe , Humans , RubberABSTRACT
Three experiments are reported using the 'negative priming' paradigm to investigate cognitive differences in normal schizotypal subjects. Lists of Stroop colour words were presented at different display times in a number of priming and non-priming conditions, in one of which the ignored colour name predicted the colour of the next target item. The increased RT latencies to the target normally found in this condition were reduced, or even reversed, in high schizotypal subjects selected on the basis of a new schizotypy scale (STA). This effect was confined to a very short presentation time (100 ms), suggesting that schizotypy is associated with weakened inhibition operating in the early (automatic) stages of information processing. The familiar Stroop (interference) effect was related overall to negative priming, but was not responsible for the schizotypy differences.
