Commensurations and Metric Properties of Houghton's Groups

We describe the automorphism groups and the abstract commensurators of Houghton's groups. Then we give sharp estimates for the word metric of these groups and deduce that the commensurators embed into the corresponding quasi-isometry groups. As a further consequence, we obtain that the Houghton group on two rays is at least quadratically distorted in those with three or more rays

The changes in chemical composition during development of the bovine nuchal ligament

Whole bovine nuchal ligaments, or portions thereof (in the case of commercially valuable animals), were obtained from 45 animals (28 fetal and 17 postnatal) ranging in age from 110 days of gestation to 10 yr. Insoluble elastin was quantitatively prepared from the fresh ligaments by extraction with hot alkali and by a combination of multiple extractions with alkaline buffer and then repeated autoclaving. When adult samples were examined, the yields of insoluble residue by these two methods were very similar, but with young fetal samples the second method gave significantly higher values, because of incomplete purification of the elastin residue. The changes in the concentration of collagen, alkali-insoluble elastin, and DNA have been examined. DNA concentration, and, thus, cell population density, fell progressively during the fetal period of development, to reach a steady value soon after birth. Collagen appeared in appreciable quantities before elastin, but its concentration was rapidly halved at about the time of birth. Insoluble elastin concentration was low until the end of the 7th fetal month, at which time it began to rise rapidly. The rate of increase in elastin concentration remained high throughout the next 10–12 wk, by which time the adult value had been reached. Quantitative studies, on the basis of the whole ligament, showed that the total cell content rises to a maximum at birth, but falls soon after to a level about half that at birth. Total collagen production and elastin deposition continue at a steady, maximal rate over the interval from 235 days of gestation to the end of the 1st postnatal month. It is concluded that the immediate postnatal period would be the most favorable phase in which to attempt the isolation of the soluble precursor elastin

School of Law_Maine Law Events & Announcements Email

Email from Kayleigh E. Cleary J.D. Candidate, Class of 2022, Student Bar Association Director of Communications, University of Maine School of Law regarding forthcoming events in the School

Benevolent Maleficence:How a Well-Intentioned Legislature and a Deferential Court Combined to Stunt the Development of Massachusetts Product Liability Law

Massachusetts product liability law is unusual. Unlike most states, Massachusetts does not recognize strict tort liability in the product area. Rather, strict product liability is limited to breaches of warranty under Article 2 of the Uniform Commercial Code. the Massachusetts Legislature amended Article 2 in several ways to provide a strict liability remedy that is, in the words of the Massachusetts Supreme Judicial Court, congruent in nearly all respects with the principles of strict tort liability. The court has construed the amendments to the UCC as precluding the adoption of strict tort liability in Massachusetts. In most ways, Massachusetts product liability law is in the mainstream of general American Law. There are, however, vestiges of sales law that make that law unusual because of the way it developed. There are also problems of statutory interpretation caused by the engrafting of the concepts of strict tort liability into the contract law of Article 2. This article explores some of these problems. It argues that, by either judicial or legislative action, strict product liability should not be restricted to warranties that arise from a sale or lease. The article also discusses one of the remaining encumbrances of sales law, the requirement that a buyer give notice of a claimed breach of warranty to the seller or be barred from any remedy, and argues that the requirement does not apply to warranty beneficiaries, who are not buyers in privity with the seller, and that, in any event, the legislature should abolish the notice requirement in all warranty cases in which there has been personal injury. The article also discusses some of the problems of statutory interpretation caused by having two statutes of limitation and two notice provisions applicable to warranty claims in Article 2 as a result of the product liability amendments

An Annotated Check-List of the Fishes of the Iowa-Cedar River Drainage Basin in Iowa

The Iowa-Cedar River drainage basin, which finds the larger of the two rivers, the Cedar, as a tributary to the smaller, is second in size of various inland river drainage basins in the state. The combined rivers drain 11,615 square miles or, roughly, one-fifth of the area of the state. The Iowa River, which has its source in Crystal Lake, in Hancock County, flows southeast for a distance of 329 miles and has a 685-foot fall from source to mouth. From its source the river has a gentle slope of 1.5 feet per mile till it reaches Franklin and Hardin Counties, where the gradient increases to 7.5 feet per mile. It levels off sharply below Iowa Falls and nearly returns to its original gradient. The valley of the Iowa is narrow and gives rise to only one important tributary, the English River, which enters the Iowa 30 miles above its junction with the Cedar

Properties of high emittance materials

High emittance coating materials for beryllium, niobium-zirconium compounds, and stainless steel used in spacecraft radiator