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Dexter, Richard,Qualley, Anthony,Kish, Christine M.,Ma, Choong Je,Koeduka, Takao,Nagegowda, Dinesh A.,Dudareva, Natalia,Pichersky, Eran,Clark, David Blackwell Publishing Ltd 2007 The Plant journal Vol.49 No.2
<P><B>Summary</B></P><P>Petunia flower petals emit large amounts of isoeugenol, which has been shown to be synthesized by isoeugenol synthase (PhIGS1) from an ester of coniferyl alcohol, hypothesized to be coniferyl acetate. This paper describes the identification and characterization of a novel petunia gene encoding an enzyme belonging to the BAHD acyltransferase family whose expression correlates with isoeugenol biosynthesis. RNAi suppression of this gene results in inhibition of isoeugenol biosynthesis. Biochemical characterization of the protein encoded by this gene showed that it has acetyltransferase activity and is most efficient with coniferyl alcohol among the alcohol substrates tested. Overall, these data support the conclusion that coniferyl acetate is the substrate of isoeugenol synthase.</P>
Robert J. Dexter,Hussam N. Mahmoud,Paul Pilarski 한국강구조학회 2005 International Journal of Steel Structures Vol.5 No.3
As part of two comprehensive fatigue evaluations of replacement orthotropic bridge decks in New York City, NY, USA, in-place in 1999 and was posibly the largest field instrumentation study conducted on an in-service orthotropic deck in the USAuntil that time. The second field study was initiated in 202 on a diferent orthotropic deck and utilized more advanced remotedata acquisition and monitoring techniques. During both studies controlled load testing and uncontrolled remote monitoringwere completed. The remote monitoring systems utilized an innovative application of traditional data acquisition coupled withacquisition systems were controlled remotely using secure conections from the ATLS Engineering Research Center at LehighUniversity. This paper reports on the techniques used in the field and provides guidance on instrumentation and field monitoringof these unique structural systems.
Ryan M. Chadha,Franklin Dexter,Sorin J. Brull 대한마취통증의학회 2020 Korean Journal of Anesthesiology Vol.73 No.4
Background: We evaluated the validity of assessing patient satisfaction with the sedation regimen among patients being discharged 45 min after receiving midazolam. If most patients do not have recall, then the sedation cannot be considered complete at the time of evaluation. Methods: In this prospective cohort study, 20 patients underwent cataract surgery with nurse-administered midazolam and fentanyl. The 11-item Iowa Satisfaction with Anesthesia Scale was administered ≅ 30 min after sedation in the recovery room. Recalled items were evaluated the next morning. Results: Eleven patients recalled 0 themes, 4 recalled 1, 4 recalled 2, and 1 recalled 3 themes. Thus, 15/20 patients (75%) recalled 0 or 1 of the 11 themes (P = 0.021 versus half the patients). The 95% one-sided lower confidence limit for 0, 1, or 2 themes was 80% of patients (P < 0.001 versus half). Patients who received less midazolam recalled more themes (Kendall’s τb = 0.43, P = 0.039). Conclusions: Evaluating patient satisfaction with sedation shortly after admission to the post-anesthesia care unit is invalid because of a lack of recall; the sedation/amnesia is ongoing. Patient comfort may be assessed, but comfort is not synonymous with satisfaction; ‘satisfaction’ implies presence of recall. Because we studied sedation with low doses of midazolam and fentanyl, the same conclusion reliably would apply to larger doses of anxiolytics administered intraoperatively. The results match previous findings that when patients receive preoperative midazolam prior to meeting the anesthesiologist, even if the patient fully answers questions, they may have negligible recall of having met the anesthesiologist.
A PROPAGATION PATH LOSS MODEL OF GLOBE TELECOMMUNICATIONS’ CELLULAR MOBILE SYSTEM OVER CEBU CITY
Andrew Louis M. Canonigo,Dexter A. Hormillada,Krsytale C. Chan,Carl E. Markgraph II,Ronyard Olivere B. Penola,Alberto S. Banacia 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This research study is about a Propagation Path Loss Model for Cebu City. With a Propagation Path Loss model, transmission loss and strength of the signal received at a certain distance can be predicted. The Study is done to address the lack of a Propagation path loss model for Cebu City. A Propagation Model is empirical in nature. With this said, great amounts of data was gathered through a random route walk test using the Nokia Net Monitor installed on a Nokia 3310 cell phone to measure signal strength and using the Gramin GPS 12 personal navigator, distance form the base station was measured. The Lee microcell model was used and is fit for the microcell environment. As specified, building block densities were calculated using a topographical map which details building orientations over the subject area. From the data gathered a Propagation path Loss Model was formulated and validated over the said area in Cebu City. From the model generated, a close likeliness of the actual measured data to the predicted data was observed. It was also found out that the Lee microcell model was sensitive to terrain undulation.
Cabural, Aubrey M.,Catarig Dexter T.,Evangelista Marjory P.,Go Josie Lace Y.,Martillano Mary Hope T.,Banacia Alberto S. 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In this paper, we have presented a system which performs automatic face detection and tracking using Motion Detection and Principal Component Analysis. The system was implemented with the use of a network camera VB-C50i and MATLAB 7.0. We divided the study into three (3) major stages. The first stage was the motion detection. After motion had been detected, face detection happened and then finally the detected face was tracked down. The first stage is motion detection. This was performed by setting a threshold for the maximum difference and used this threshold as an indicator for motion. The second stage for this system is face detection. When the system detected the image, the camera automatically captured the image. The captured image was then zoomed in and the possible face region was taken as input data. This possible face region underwent principal component analysis for face detection. After the principal component analysis detected the face, the image was cropped and zoomed in. The final stage is the tracking down of the face as analyzed in the first two stages. Once the system was able to track down the location of the face, it automatically displayed the detected face area. The whole system functioned in such away that it continued to loop every time a motion was detected. The whole system shows the efficiency and accuracy of automatic face detection and tracking with the use of principal component analysis.
Solvent Isotope Effects on the Onset of Inhibiton of Porcine Pepsin by Pepstantin
Cho, Yong-Kweon,Karen I Rebholz,Dexter B Northrop 國立 昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
Pepstatin is a slow and right binding inhibitor of pepsin. Preincubating enzyme and inhibitor in H_(2)O and in D_(2)O in the absence of substrate generates an inverse solvent isotope effect of ^(D)k=0.69±0.06 on the apparent first-order rate constant for the decay in enzymatic activity. Proton inventory analysis of the inverse isotope effect suggests a single transition-state proton with a fractionation factor of 1.41 ±0.05. In contrast, combining enzyme with inhibitor and substrate (I.eu-Ser-p-nitro-Phe-Nle-Ala-l eu-OMe) simultaneously along with observing the decay in enzymatic activity during catalytic turnovers generates a normal solvent isotope effect of ^(D)k=1.25±0.09 Proton inventory analysis of the normal isotope effect suggests a single reactant state proton with a fractionation factor of 1.46±0.03. These two experimental designs are often considered equivalent. but the differences in isotopic data require that the pathway for onset of pepstatin inhibition in the absence of substrate must be different from the pathway in the presence of substrate. In the former, the inhibitor can only bind to free enzyme; in the latter, the inhibitor is hindered from binding to free enzyme because of competition with substrate but can bind to intermediate forms of enzyme generated during catalytic turnovers, downstream from enzyme product complexes.