An Empirical Investigation On Search Engine Ad Disclosure

This representative study of German search engine users (N=1,000) focuses on the ability of users to distinguish between organic results and advertisements on Google results pages. We combine questions about Google's business with task-based studies in which users were asked to distinguish between ads and organic results in screenshots of results pages. We find that only a small percentage of users is able to reliably distinguish between ads and organic results, and that user knowledge of Google's business model is very limited. We conclude that ads are insufficiently labelled as such, and that many users may click on ads assuming that they are selecting organic results

Nano-chemistry and scanning probe nanolithographies

The development of nanometer-scale lithographies is the focus of an intense research activity because progress on nanotechnology depends on the capability to fabricate, position and interconnect nanometer-scale structures. The unique imaging and manipulation properties of atomic force microscopes have prompted the emergence of several scanning probe-based nanolithographies. In this tutorial review we present the most promising probe-based nanolithographies that are based on the spatial confinement of a chemical reaction within a nanometer-size region of the sample surface. The potential of local chemical nanolithography in nanometer-scale science and technology is illustrated by describing a range of applications such as the fabrication of conjugated molecular wires, optical microlenses, complex quantum devices or tailored chemical surfaces for controlling biorecognition processes.The authors would like to thank Fabio Biscarini for providing the much needed input to write the manuscript and Marta Tello for her valuable suggestions. This work was financially supported by the MCyT (Spain) (MAT2003-02655) and the European Commission (NAIMO, IP NMP4-CT-2004-500355).Peer reviewe

Long range transport and fate of a stratospheric volcanic cloud from Soufrière Hills volcano, Montserrat

International audienceVolcanic eruptions emit gases, ash particles and hydrometeors into the atmosphere, occasionally reaching heights of 20 km or more, to reside in the stratospheric overworld where they affect the radiative balance of the atmosphere and the Earth's climate. Here we use satellite measurements and a Lagrangian particle dispersion model to determine the mass loadings, vertical penetration, horizontal extent, dispersion and transport of volcanic gases and particles in the stratosphere from the volcanic cloud emitted during the 20 May 2006 eruption of Soufrière Hills volcano, Montserrat, West Indies. Infrared, ultraviolet and microwave radiation measurements from two polar orbiters are used to quantify the gases and particles, and track the movement of the cloud for 23 days, over a distance of ~18 000 km. Approximately, 0.1±0.01 Tg(S) was injected into the stratosphere in the form of SO2: the largest single sulphur input to the stratosphere in 2006. Microwave Limb Sounder measurements indicate an enhanced mass of HCl of ~0.003?0.01 Tg. Geosynchronous satellite data reveal the rapid nature of the stratospheric injection and indicate that the eruption cloud contained ~2 Tg of ice, with very little ash reaching the stratosphere. These new satellite measurements of volcanic gases and particles can be used to test the sensitivity of climate to volcanic forcing and assess the impact of stratospheric sulphates on climate cooling

Financial Management and Financial Problems As They Relate to Marital Satisfaction in Early Marriage

The financial management habits and perceptions of young married couples were examined, as well as their financial problems and perceptions of their problems\u27 magnitude in an attempt to assess the relationship of these financial factors to marital satisfaction. A survey was delivered to 604 residents of family student housing at Utah State University. The spouse who predominantly handled family finances was asked to complete the survey. By using an incentive for completing the survey, a response of 51.32% was obtained. It was hypothesized that both financial management practices and problems would be related to a couple\u27s reported satisfaction with their marriage. It was further hypothesized that there would be a difference in how husbands and wives would report the relationship between financial management, financial problems, and marital satisfaction. As hypothesized, financial management behaviors as well as perceptions of how well finances were managed were found to be significantly correlated with the respondents\u27 marital satisfaction. Likewise, financial problems and perceived magnitude of financial problems were found to be significantly related to marital satisfaction. According to a regression analysis, perceptions may be more predictive of marital satisfaction than actual financial management practices. Contrary to the hypothesis, there were no consistent, clear differences between husbands and wives in the effect of financial variables on marital satisfaction for this sample. In general, these findings support the widely accepted, but rarely studied, assumption that finances can affect a marital or committed couple relationship. These effects involve actual behaviors as well a s perceptions of behaviors

HCV Innate Immune Responses

Hepatitis C virus (HCV) establishes a persistent infection in more than 70% of infected individuals. This striking ability to evade the powerful innate immune system results from viral interference occurring at several levels of the interferon (IFN) system. There is strong evidence from cell culture experiments that HCV can inhibit the induction of IFNβ by cleaving important proteins in the virus sensory pathways of cells such as MAVS and TRIF. There is also evidence that HCV interferes with IFNα signaling through the Jak-STAT pathway, and that HCV proteins target IFN effector systems such as protein kinase R (PKR). These in vitro findings will have to be confirmed in clinical trials investigating the molecular mechanisms of HCV interference with the innate immune system in liver samples