2,361 research outputs found
Guaranteeing the \~O(AGM/OUT) Runtime for Uniform Sampling and OUT Size Estimation over Joins
We propose a new method for estimating the number of answers OUT of a small
join query Q in a large database D, and for uniform sampling over joins. Our
method is the first to satisfy all the following statements. - Support
arbitrary Q, which can be either acyclic or cyclic, and contain binary and
non-binary relations. - Guarantee an arbitrary small error with a high
probability always in \~O(AGM/OUT) time, where AGM is the AGM bound OUT (an
upper bound of OUT), and \~O hides the polylogarithmic factor of input size. We
also explain previous join size estimators in a unified framework. All methods
including ours rely on certain indexes on relations in D, which take linear
time to build offline. Additionally, we extend our method using generalized
hypertree decompositions (GHDs) to achieve a lower complexity than \~O(AGM/OUT)
when OUT is small, and present optimization techniques for improving estimation
efficiency and accuracy.Comment: 19 page
Proteome-Level Responses of Escherichia coli to Long-Chain Fatty Acids and Use of Fatty Acid Inducible Promoter in Protein Production
In Escherichia coli, a
long-chain acyl-CoA is a regulatory
signal that modulates gene expression
through its binding to a transcription
factor FadR. In this study,
comparative proteomic analysis of
E. coli in the presence
of glucose and oleic acid was
performed to understand cell
physiology in response to oleic acid.
Among total of 52 proteins showing
altered expression levels with oleic
acid presence, 9 proteins including
AldA, Cdd, FadA, FadB, FadL, MalE,
RbsB, Udp, and YccU were newly
synthesized. Among the genes that were
induced by oleic acid, the promoter of
the aldA gene was used
for the production of a green
fluorescent protein (GFP). Analysis of
fluorescence intensities and confocal
microscopic images revealed that
soluble GFP was highly expressed under
the control of the aldA
promoter. These results suggest that
proteomics is playing an important
role not only in biological research
but also in various biotechnological
applications
Ca2+-Dependent Interaction between FKBP12 and Calcineurin Regulates Activity of the Ca2+ Release Channel in Skeletal Muscle
AbstractCalcineurin is a Ca2+ and calmodulin-dependent protein phosphatase with diverse cellular functions. Here we examined the physical and functional interactions between calcineurin and ryanodine receptor (RyR) in a C2C12 cell line derived from mouse skeletal muscle. Coimmunoprecipitation experiments revealed that the association between RyR and calcineurin exhibits a strong Ca2+ dependence. This association involves a Ca2+ dependent interaction between calcineurin and FK506-binding protein (FKBP12), an accessory subunit of RyR. Pretreatment with cyclosporin A, an inhibitor of calcineurin, enhanced the caffeine-induced Ca2+ release (CICR) in C2C12 cells. This effect was similar to those of FK506 and rapamycin, two drugs known to cause dissociation of FKBP12 from RyR. Overexpression of a constitutively active form of calcineurin in C2C12 cells, ΔCnA(391–521) (deletion of the last 131 amino acids from calcineurin), resulted in a decrease in CICR. This decrease in CICR activity was partially recovered by pretreatment with cyclosporin A. Furthermore, overexpression of an endogenous calcineurin inhibitor (cain) or an inactive form of calcineurin (ΔCnA(H101Q)) in C2C12 cells resulted in up-regulation of CICR. Taken together, our data suggest that a trimeric-interaction among calcineurin, FKBP12, and RyR is important for the regulation of the RyR channel activity and may play an important role in the Ca2+ signaling of muscle contraction and relaxation
Advanced Technologies for Large-Sized OLED Display
Five years have passed, since the first 55″ full high-definition (FHD) OLED TV fabricated on Gen 8.5 glass was successfully launched into the TV market. For the time being, the size of OLED TV became diverse from 55″ to 77″, and the resolution was doubled into ultrahigh definition (UHD). The brightness and color gamut were enhanced, while the lower power consumption was realized. Utmost picture quality and slim form factor of OLED TV as well as the improved performance have made OLED TV recognized as the best premium TV. In this chapter, we describe the recent progress in three key technologies, which enable such an enhancement of performance in OLED TV, i.e., oxide thin-film transistor (TFT) and white organic light-emitting diode (WOLED), compensation circuit, and method to compensate the nonuniformity of oxide TFTs, OLED devices, and luminance
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