A 4-year-old girl presented with 1-year history of fatigue, early satiety, intermittent vomiting, alopecia, pallor, and weight loss without changes in bowel habits or overt gastrointestinal bleeding. Examination revealed thin hair, pale conjunctivae, and mu-cous membranes. Tachycardia and a systolic flow murmur (grade II/VI) were present. Abdomen was nontender, distended, and tympanitic, with h...

Sperm storage in cloacal spermathecae was studied in females of Triturus v. vulgaris collected early in the breeding season in southern England. Females collected in terrestrial situations, presumably unmated, were mated in the laboratory, and the ultrastructure of the transferred sperm and the spermathecae was observed at various intervals after mating. Sperm from a spermatophore cap lodged in...

We suggest constructive definitions for the determination of untangled finite graphs and three-periodic nets, using barycentric embeddings in two and three dimensions. The possibility of deliberately constructing tangled graphs and nets is canvassed, and we conclude that tangled patterns offer a novel class of nanoand meso-structured materials with useful features, including high internal surfa...

The radial distribution of track density on a solid-state nuclear track detector inside a diffusion chamber is a function of the fraction f of Po decay before deposition. In the present work, procedures are proposed to determine f experimentally by determining the track density distribution on an LR115 detector in a diffusion chamber. First, a relatively tall diffusion chamber, with a height of...

In this paper we enumerate k-noncrossing tangled-diagrams. A tangled-diagram is a labeled graph whose vertices are 1, . . . , n have degree ≤ 2, and are arranged in increasing order in a horizontal line. Its arcs are drawn in the upper halfplane with a particular notion of crossings and nestings. Our main result is the asymptotic formula for the number of knoncrossing tangled-diagrams Tk(n) ∼ c...

The medical applications of carbon nanotubes (CNTs) have garnered much attention. However, evaluating the safety of CNTs remains difficult, and no consensus has been reached. Moreover, assessing the biosafety of multi-walled CNTs (MWCNTs), which can become tangled during manufacturing, is challenging because they do not readily disperse. We studied how the dispersion state of tangled MWCNTs aff...

A tangle is a graph drawn in the plane so that any pair of edges have precisely one point in common, and this point is either an endpoint or a point of tangency. If we allow a third option: the common point may be a proper crossing between the two edges, then the graph is called a tangled thrackle. We establish the following analogues of Conway’s thrackle conjecture: The number of edges of a ta...

the role of some ring structures in the distribution of porphyry copper deposits in south kerman porphyry copper belt is discussed. in the study area, ring structures are circular or elliptical shaped features which are partly recognized on satellite images. in this study, landsat multispectral images were used to identify ring structures in the area. the rudimentary identification stages of th...