BACKGROUND There is a need for reliable methods of glucose measurement in different environmental conditions. The objective of this in vitro study was to evaluate the performance of the Enlite® Sensor when connected to either the iPro™ Continuous Glucose Monitor recording device or the Guardian® REAL-Time transmitting device, in hypobaric and hyperbaric conditions. METHODS Sixteen sensors con...

Surface acoustic waves are used to actuate and process smallest possible amounts of fluids on the planar surface of a piezoelectric chip. Chemical modification of the chip surface is employed to create virtual wells and tubes to confine the liquids. Lithographically modulated wetting properties of the surface define a fluidic network, in analogy to the wiring of an electronic circuit. Acoustic ...

Visual recognition of material boundaries in transparent vessels is valuable for numerous applications. Such recognition is essential for estimation of fill-level, volume and phaseboundaries as well as for tracking of such chemical processes as precipitation, crystallization, condensation, evaporation and phase-separation. The problem of material boundary recognition in images is particularly c...

Watercress (Lepidium sativum) is consumed as a vegetable, especially by the indigenous community in New Zealand. An investigation was carried out on the accumulation of arsenic by watercress, following earlier reports of inordinate arsenic concentrations in some aquatic macrophytes collected from the Waikato River, North Island, New Zealand. The Waikato River and some other aquatic systems in T...

Context: Medicinal plants contains some pesticidal activities that may control stored product insects. Objectives: To elucidate the insecticidal activity from the stem bark extracts of nishinda (Vitex negundo L.) and their toxicity against red flour beetle, Tribolium castaneum (Herbst) (Tenebrionidae). Materials and Methods: The powdered stem bark (250 g) was extracted with methanol (MeOH), eth...

The use of the insecticide fipronil has dramatically increased in recent years, yet few studies have been performed compared to other popular pesticides. Although fipronil binds readily to organic carbon in soil, past studies have focused on fipronil toxicity in water but not the effects of fipronil toxicity in sediment. This study addresses the need for a broader range in fipronil toxicity res...

Chlamydomonas reinhardtii is a science superstar. This diminutive green alga with 1 cell and 2 lively flagella, and the nickname Chlamy, consistently punches above its weight in the arena of big research (Harris 2001). When not basking in freshwater ponds, it is found in laboratory beakers, helping researchers answer essential questions about the evolution and physiology of cells. In 2007, Chla...

■ Ultimately, consumers could have labs-on-chips in their home for fast diagnosis of common illnesses. —The Editors Imagine shrinking the beakers, eyedroppers, chemicals and heaters of a chemistry lab onto a little microchip that could dangle from a key chain. A growing number of companies and universities are claiming to have devised such marvels, ready to perform vital analyses from detecting...

M icroRNAs (miRNAs) are single-stranded RNA molecules of approximately 22 nucleotides. They regulate protein expression by binding to and suppressing translation of messenger RNAs. Less than 20 years ago, they were unheard of, but the number of identifi ed miRNAs is growing. This burgeoning fi eld captured Anto-nio Giraldez's attention while he was a PhD student studying Drosophila wing morpho-...

The isolation of increasing numbers of human cell strains has stirred up old problems and created new ones. For example, continuously maintained transferable cells lose their resemblance to those of the original explanted tissues, and there are many similarities among cultured cells derived from different sources. Furthermore, in vitro the cells may acquire features pathologists rely on for rec...