77,946 research outputs found
Optimal estimates for the electric field in two dimensions
No full textAbstractWe establish both upper and lower bounds on the electric field in the case where two circular conductivity inclusions are very close but not touching. We also obtain such bounds when a circular inclusion is very close to the boundary of a circular domain which contains the inclusion. The novelty of these estimates, which improve and make complete our earlier results in [H. Ammari, H. Kang, M. Lim, Gradient estimates for solutions to the conductivity problem, Math. Ann. 332 (2005) 277–286], is that they give an optimal information about the blow-up of the electric field as the conductivities of the inclusions degenerate
Variation of in vivo efficiency of the bacteriophage T7 terminator depending on terminator-upstream sequences
No full textThe 40-kb linear genome of bacteriophage T7 contains only one terminator T phi, for the phage T7 RNA polymerase that is located between genes 10 and 11, Its in vitro termination efficiency has been previously found to vary upon any sequence within a transcription unit [Lee, J. T., Kim, H., Moon, K;., Kim, S., and Kang, C. (1991) Mel. Cells 1, 203-209]. In order to see if this variation takes place also in vivo, termination efficiencies within E. coli cells of the same terminator in the three different transcription units were measured in this study. The three recombinant plasmids, pNNTcat, pSNTcat, and pSSTcat, are different only in promoter-proximal, terminator distal sequence, and/or terminator-proximal upstream sequence. They have shown substantially different in vitro termination efficiencies. In vivo termination efficiencies were measured by two different methods. One method was to compare the expression product levels of a terminator-downstream caf gene (CAT activity) in the presence and absence of the terminator. The other was to compare the RNA levels of terminator-upstream and -downstream DNA. The in vivo termination efficiencies were different in three different plasmids when measured by RNA levels: levels: 97% in pNNTcat, 79% in pSNTcat, and 52% in pSSTcat (the latter tao plasmids showed significantly lower values when measured by protein levels). These in vivo efficiencies were substantially higher than the previously measured in vitro values (77%, 35%, and 17%, respectively). Nevertheless, the order of termination efficiency among the three plasmids was the same within E. call cells as in vitro: pNNTcat > pSNTcat > pSSTcat. Thus, termination efficiency of phage T7 RNA polymerase at the T7 terminator T phi varies upon both terminator-proximal and -distal upstream sequences not only in vitro, but also within E. coli cells
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Augmented reality window: Digital reconstruction of a historical and cultural site for smart phones
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The dynamics of trades and quote revisions across stock, futures, and option markets
No full textThis paper examines the dynamics of returns and order imbalances across the KOSPI 200 cash, futures and option markets. The information effect is more dominant than the liquidity effect in these markets. In addition, returns have more predictability power for the future movements of prices than order imbalances. Information seems to be transmitted more strongly from derivative markets to their underlying asset markets than from the underlying asset markets to their derivative markets. Finally, domestic institutional investors prefer futures, domestic individual investors prefer options, and foreign investors prefer stocks relative to other investor groups when they have new information. ?? 2008 World Scientific Publishing Co. and Center for Pacific Basin Business, Economics and Finance Research
Tests of alternate models for the pricing of Korean Treasury bond futures contracts
No full textIt is known that KTB futures contracts are significantly underpriced when the model price is calculated using the ad hoc cost-of-carry model employed in industry. This paper examines whether this underpricing phenomenon is caused by using the wrong model to price the futures contracts. This paper documents that the difference between the model price and the market price of KTB futures decreases substantially if the correct term-structure-based model is used to estimate the model price of KTB futures. In addition, even though the underpricing phenomenon can be exploited to generate some trading profits, the profits cannot be regarded as arbitrage profits. Thus, we believe that the underpricing phenomenon is illusory, and that much of it can be attributed to the wrong model being used in the industry. ？ 2006 Elsevier B.V. All rights reserved
sj-docx-1-jdr-10.1177_00220345221098910 – Supplemental material for Systemic Multimorbidity Clusters in People with Periodontitis
No full textSupplemental material, sj-docx-1-jdr-10.1177_00220345221098910 for Systemic Multimorbidity Clusters in People with Periodontitis by H. Larvin, J. Kang, V.R. Aggarwal, S. Pavitt and J. Wu in Journal of Dental Research</p
Survival and growth of tamarack seed sources in ten NC-99 tests
No full textMohn, C.A.; Hanover, J. W.; Kang, H.; Stine, R.A.. (1985). Survival and growth of tamarack seed sources in ten NC-99 tests. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/234223
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