A graph is chordal if and only if it is the intersection graph of some family of subtrees of a tree. Applying “tolerance” allows larger families of graphs to be represented by subtrees. A graph G is in the family [∆, d, t] if there is a tree with maximum degree ∆ and subtrees corresponding to the vertices of G such that each subtree has maximum degree at most d and vertices of G are adjacent if...

In 1972 a total of 112 workers exposed to toluene diisocyanate (TDI) were examined for acute pulmonary function changes during a work shift on the first day of the working week. A dose-response relationship was demonstrated for the acute effects of TDI in this population. The cohort was restudied in 1974 to determine whether there was excessive loss of pulmonary function, and if so, whether the...

To the Editor: human serum. For statistical analysis, serum samples that showed no detectable FasL were attributed a level of 30 pg/mL, equivalent to half of the lowest detectable concentration. The subjects tested Several reports have established an impotant role for Fas/Fas liwere 20 HIV-seronegative healthy controls, 28 asymptomatic HIVgand (FasL) interaction in mediating programmed cell dea...

In 1972 a total of 112 workers exposed to toluene diisocyanate (TDI) were examined for acute pulmonary function changes during a work shift on the first day of the working week. A dose-response relationship was demonstrated for the acute effects of TDI in this population. The cohort was restudied in 1974 to determine whether there was excessive loss of pulmonary function, and if so, whether the...

Masashi Murakami Tomakomai Experimental Forest, Hokkaido University Forests, Tomakomai 053-0035, Japan. Food webs, describing the links among consumers and their prey in ecological communities, have a long history of study in ecology dating back to Charles Elton’s research in the 1920s [1,2]. Subsequently, however, experimental work on food webs has focused within habitats on the effects of spe...

BACKGROUND Questions have been raised concerning the safety of intra-articular anterior cruciate ligament (ACL) reconstruction in prepubescent children aged <7 years. However, normal values for the width of the lateral femoral condylar epiphysis and height of the tibial epiphysis have yet to be established through the use of magnetic resonance imaging (MRI). PURPOSE To determine normal values...

Future advanced applications will require new types of objects such as continuous media objects and distributed objects[3, 1]. Such requirements will stress operating systems ability to support various levels of timeliness, reliability and performance. A single computational model and resource management policy may not cover conflicting users requirements. Therefore, an extensible operating sys...

We assessed Ki-ras mutations by single-strand conformation polymorphism followed by DNA sequencing, p53 expression by immunohistochemistry, ploidy status, and S-phase fraction in 66 stage II and 163 stage III colon cancer patients enrolled on a randomized trial of surgery followed by observation or adjuvant levamisole or 5-fluorouracil (5FU) plus levamisole (Intergroup Trial 0035) to see whethe...

Activation of the fi brinolytic system is an integral part of vascular haemostatic mechanisms to maintain vascular patency. The basis of fi brinolysis is the conversion of the inactive substrate plasminogen to plasmin, an enzyme that cleaves fi brin but also has pleiotropic eff ects. Multiple mechanisms are responsible for generating plasmin, including endothelial activation and release of tiss...