651 research outputs found
Ghera: A Repository of Android App Vulnerability Benchmarks
Security of mobile apps affects the security of their users. This has fueled
the development of techniques to automatically detect vulnerabilities in mobile
apps and help developers secure their apps; specifically, in the context of
Android platform due to openness and ubiquitousness of the platform. Despite a
slew of research efforts in this space, there is no comprehensive repository of
up-to-date and lean benchmarks that contain most of the known Android app
vulnerabilities and, consequently, can be used to rigorously evaluate both
existing and new vulnerability detection techniques and help developers learn
about Android app vulnerabilities. In this paper, we describe Ghera, an open
source repository of benchmarks that capture 25 known vulnerabilities in
Android apps (as pairs of exploited/benign and exploiting/malicious apps). We
also present desirable characteristics of vulnerability benchmarks and
repositories that we uncovered while creating Ghera.Comment: 10 pages. Accepted at PROMISE'1
Oceanographic results from the VERTEX 3 Particle Interceptor Trap Experiment off central Mexico,October-December,1982
In this report, we present oceanographic results from
VERTEX 3 Particle Interceptor Trap (PIT) experiment
conducted off the western-coast of Mexico during October to
November 1982. The oceanographic data presented here were
obtained during three cruise legs by Moss Landing Marine
Laboratory scientists aboard R/V Cayuse while the detailed
chemical studies were done by other scientists aboard R/V
Wecoma. Only the oceanographic data will be presented in
this report. (PDF contains 82 pages
AS-506 ''G'' Manned Lunar Landing Mission post-launch operational trajectory for 16 July 1969
Apollo 11 post-launch trajectory dat
Teacher Perceptions of Climate, Motivation, and Self-Efficacy: Is There Really a Connection
This study investigated if correlations existed between teachers’ perceptions of elements of a safe and supportive school climate/working environment in regards to teachers’ intrinsic motivation and self-efficacy beliefs. Additionally, it examined the degree of significance when teachers feel safe and supported versus those that do not. Finally, it investigated which of the four elements has the greatest impact on intrinsic motivation and self-efficacy through the lens of educators to improve teaching, teacher retention, and job satisfaction. Survey data were collected from certified teachers in West Tennessee school districts. The responses to the Safe and Supportive School Questionnaire and Attitude Toward Teaching Survey provided quantitative data for analyses. A series of independent samples t-tests, liner regressions, and Spearman correlations revealed strong positive correlation existed between a number of the four elements and intrinsic motivation and self-efficacy. Additionally, it revealed teachers have significantly higher intrinsic motivation and self-efficacy in safe and supportive schools. Conclusions of this study and recommendations are outlined in this paper
Absence of arsenate in DNA from arsenate-grown GFAJ-1 cells
A strain of Halomonas bacteria, GFAJ-1, has been reported to be able to use
arsenate as a nutrient when phosphate is limiting, and to specifically
incorporate arsenic into its DNA in place of phosphorus. However, we have found
that arsenate does not contribute to growth of GFAJ-1 when phosphate is
limiting and that DNA purified from cells grown with limiting phosphate and
abundant arsenate does not exhibit the spontaneous hydrolysis expected of
arsenate ester bonds. Furthermore, mass spectrometry showed that this DNA
contains only trace amounts of free arsenate and no detectable covalently bound
arsenate.Comment: Originally submitted to Science January 30 2012. This is the revised
version, resubmitted on April 13 2012. It has not been officially accepte
The secretion inhibitor Exo2 perturbs trafficking of Shiga toxin between endosomes and the trans-Golgi network
The small-molecule inhibitor Exo2 {4-hydroxy-3-methoxy-(5,6,7,8-tetrahydrol[1]benzothieno[2,3-d]pyrimidin-4-yl)hydraz-one benzaldehyde} has been reported to disrupt the Golgi apparatus completely and to stimulate Golgi–ER (endoplasmic reticulum) fusion in mammalian cells, akin to the well-characterized fungal toxin BFA (brefeldin A). It has also been reported that Exo2 does not affect the integrity of the TGN (trans-Golgi network), or the direct retrograde trafficking of the glycolipid-binding cholera toxin from the TGN to the ER lumen. We have examined the effects of BFA and Exo2, and found that both compounds are indistinguishable in their inhibition of anterograde transport and that both reagents significantly disrupt the morphology of the TGN in HeLa and in BS-C-1 cells. However, Exo2, unlike BFA, does not induce tubulation and merging of the TGN and endosomal compartments. Furthermore, and in contrast with its effects on cholera toxin, Exo2 significantly perturbs the delivery of Shiga toxin to the ER. Together, these results suggest that the likely target(s) of Exo2 operate at the level of the TGN, the Golgi and a subset of early endosomes, and thus Exo2 provides a more selective tool than BFA for examining membrane trafficking in mammalian cells
Strain-induced quantum dots by self-organized stressors
Novel in situ method to produce quantum dots is reported. Three‐dimensional confinement of carriers to a GaInAs/GaAs quantum welldots is observed by photoluminescence. The confinement potential is induced by stressors, formed by self‐organizing growth of InP nanoscale islands on top barrier GaAssurface. Two transitions arising from the strain‐induced quantum dots produced by two types of InP islands are identified. The luminescence from higher electronic states of the quantum dots having a level splitting of 8 meV is also observed.Peer reviewe
Increasing the expression of calcium-permeable TRPC3 and TRPC7 channels enhances constitutive secretion
The hTRPC [human TRPC (canonical transient receptor potential)] family of non-selective cation channels is proposed to mediate calcium influx across the plasma membrane via PLC (phospholipase C)-coupled receptors. Heterologously expressed hTRPC3 and hTRPC7 have been localized at the cell surface; however, a large intracellular component has also been noted but not characterized. In the present study, we have investigated the intracellular pool in COS-7 cells and have shown co-localization with markers for both the TGN (trans-Golgi network) and the cis-Golgi cisternae by immunofluorescence microscopy. Addition of BFA (Brefeldin A) to cells expressing hTRPC3 or hTRPC7 resulted in the redistribution of the Golgi component to the endoplasmic reticulum, indicating that this pool is present in both the Golgi stack and the TGN. Expression of either TRPC3 or TRPC7, but not TRPC1 or the cell surface marker CD8, resulted in a 2–4-fold increase in secreted alkaline phosphatase in the extracellular medium. Based on these results, we propose that an additional function of these members of the hTRPC family may be to enhance secretion either by affecting transport through the Golgi stack or by increasing fusion at the plasma membrane
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