usually invisible process behind all published research. Here I reconstruct my theorizing for an historical ethnography of the 1986 Space Shuttle Challenger disaster and the NASA (National Aeronautical and Space Administration) decisions that produced that accident. I show how analogical theorizing, a method that compares similar events or activities across different social settings, leads to m...

Development of the technique of video phlebo-graphy has enabled the anatomy and physiology of the venous pump in the human foot to be demonstrated.' This hitherto largely unrecog-nised organ consists of the abnormally large venae comites of the lateral plantar artery (fig 1). The plantar venous pump has a stroke volume of between 20 and 30 ml and is activated simply by weight bearing. There are...

from Pollen of Hippeastrum x hortorum Nikolay Youhnovski, Christa Werner* and Manfred Hesse Organisch-chemisches Institut der Universität Zürich. Winterthurerstrasse 190, CH-8057 Zürich. Fax: +41-1-6356812. E-mail: [email protected] * Author of correspondance and reprint requests Z. Naturforsch. 56c, 526-530 (2001); received March 27, 2001 Amaryllidaceae. Anthers, Hydroxycinnamoyl polyamines...

Background: Fetus-In-Fetu (FIF) is a rare congenital malformation, which consists of a fetus mixed with a distinct tissue that is from the other fetus of twin. FIF is defined as a mass containing a vertebral axis often associated with other organs or limbs around this central axis.Case report: The patient was a two day old girl infant who due to a mass in a sacrum area measuring 8.5 x 12.5 cm w...

Aromatic plants are rich in essential oils with considerable antimicrobial properties.The aim of this study was to investigate chemical composition, antimicrobial activity and antioxidant properties of Melissa officinalis and Deracocephalum moldavica essential oils (EOs). The identification of chemical constituents of the EOs was carried out using gas chromato-graphy-mass spec...

There has been little research on the neural correlates of writing in children and teenagers. The purpose of the present study was to describe brain activation in a group of teenagers with isolated dysorthography vs. teenagers with good spelling skills, during a task involving the assessment of spelling accuracy in words containing an orthographic difficulty. The results will allow for conclusi...

The history of the scientific development of the Chromatography as a chemical separation tool cannot be considered ancient, as the proper establishment of Chemistry as a science is considered modern when compared to the other sciences developed before it. The first literary description of the Chromatography separation technique development is attributed to the works or Mikhail Tswet in 1890 by ...

was being admitted for chemotherapy for stage IV ovarian cancer. After large−vol− ume resuscitation, upper gastrointestinal endoscopy was performed because of hematemesis. A large ulcer (2 ” 2 cm) in the posterior wall of the duodenal bulb with a large, actively bleeding visible ves− sel (estimated diameter 5 ± 6 mm) was seen. Despite repeated local epinephrine injections, heater probe coagulat...