The mechanism of the enhancement of the fluorescence of ethidium bromide on binding to double helical RNA and DNA has been investigated. From an examination of the effect of different solvents on the fluorescence lifetime, quenching of fluorescence by proton acceptors, and the substantial lengthening of lifetime observed upon deuteration of the amino protons, regardless of the medium, we conclu...

Dans cet article, je considère le taux de pauvreté comme la proportion d’individus dont la consommation — plutôt que le revenu — est au-dessous du seuil de pauvreté absolue. Le seuil de pauvreté absolue utilisé est basé sur les dépenses nécessaires pour atteindre un niveau minimum de bien-être matériel. Ce seuil ne varie pas avec le passage du temps alors que varient les valeurs sociales ainsi ...

Brigham and Women’s Hospital, Harvard University, Boston MA, USA *Email: [email protected] Thank you so much, Professor Yacoub. It’s a great honor for me to participate in this conference. I thank you for your vision and your tremendous energy and for everything that you have and are and will accomplish in cardiovascular surgery and science. I’m going to talk about the first century of hy...

The United States-Mexico Border is 3,183 km long, running overland for 1,117 km and along rivers for 2,066 km (see Figure 1). Geographically, the border area is a desert plain broken by a mountainous zone in the region of the two Californias. The border’s highest altitude is 1,200 meters above sea level, which is reached where the border passes by Dtiuglas, Arizona (U.S.A.) and Agua Prieta, Son...

Discourse analysis of the technical document series that records the internet design history, the RFCs, shows that those involved during the first decade saw privacy as a multi-dimensional and interactive problem requiring use of a suite of solutions at the network, individual, and data levels that had to take into account the need to balance privacy against experimentation and innovation. Inte...

Young, W. F., and Pringle, E. M. (1971). Archives of Disease in Childhood, 46, 421. 110 children with coeliac disease, 1950-1969. 110 children with coeliac disease investigated over a period of 19 years are presented in 2 groups, 74 children presenting under 4 years and 36 over 4 years. Sixty per cent of the older children showed extreme stunting of growth, while 28% in the younger group at ref...

This paper reviews sports injuries in the Armed Services 1969-1980 to establish their incidence and to analyse trends over time. There were on average 2135 sports injuries per year showing a falling trend over time until 1979 and then rising. Playing soccer was the cause of 43% of the sports injuries over the years 1969-1980. By far the greatest proportion 85% the injuries occurred in the under...

to identify the horticultural of plant parasitic nematodes in northern khorasan province, 170 soil and plant root samples were collected during different seasons of years 2009 and 2010. nematodes were extracted through centrifugal-flotation method, specimens then being fixed according to modified seinhorst method and transferred to glycerin before making measurements (de grisse, 1969). througho...