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Temperature Effects on Germination of Birdsfoot Trefoil and Seombadi
Hur, S.N.,C.J.Nelson 전북대학교 농업과학기술연구소 1984 農大論文集 Vol.15 No.-
목초의 종류에 따라서는 發芽에 적합하지 않은 온도에서 파종되는 경우가 흔히 있다. 때문에 목초의 發芽率에 미치는 온도의 영향은 물른 발아가 가능한 온도의 범위를 목초 품종에 따라 알아두는 것이 중요하다. 'MO - 20' Birdsfoot trefoil (Lotus corniculatus L.) 과 섬바디(Dystaenia takesimana kitagawa) 의 種子를 3, 6, 9, 12, 15, 20, 25, 그리고 30℃로 고정시킨 發芽箱子들에 넣어서 각 온도와 시간이 발아에 미치는 영향을 연구하였다. 섬바디 종자들은 12 ~25℃ 범위에서만 발아되었고 培養溫度는 발아가 시작되는 시간과 거의 상관이 없었다. 섬바디와는 달러 Birdefoot frefoil의 경우 발아온도와 종자들이 50% 발아되는 시간의 逆數와는 線型적 상관관계가 있었다. 이는 종자의 발아가 온도 이외의 다른 요인이 작용함을 뜻한다 하겠다. Birdsfoot foil의 발아 기본온도는 4.7℃인 것으로 계산되었으며, 9~12℃에서의 發芽率이 급격히 증가하는 것으로 보아 여기에는 Arrhenius 反應, 즉 온도에 따라 급격한 영향을 받는 현상이 있는것 같다. Forage species are often planted in soils that are not at the optimum temperature for germination. Therefore, it is important to know the temperature range of germination, as well as the temperature effect on germination rate. Then appropriate management practices can be developed for that species. Temperature effects on the time course of seed germination of 'MO-20' birdsfoot trefoil (Lotus corniculatus L.) and seombadi (Dystaenia takesimana Kitagawa) were studied using germination chambers at constant temperatures of 3, 6, 9, 12, 15, 20, 25, and 30℃. Total germination percentages of both species were highest at 20℃. Time to start of germination of birdsfoot trefoil was much faster as temperatures increased. Seombadi seeds germinated only between 12 and 25℃ with little temperature influence on time to start of germination. There was a linear relationship for birdsfoot trefoil between germination temperature and the reciprocal of time to reach 50% of final germination, but there was no relationship for seombadi suggesting factors other than temperature were controlling the response. Base temperature for germination of birdsfoot trefoil was calculated to be 4.7℃. Germination rate of birdsfoot trefoil showed a marked increase between 9 and 12℃ suggesting an Arrhenius response, i.e. , and abrupt change in effect of temperature.
Development of a 60 Hz Power Standard Using SNS Programmable Josephson Voltage Standards
Burroughs, C.J.,Benz, S.P.,Dresselhaus, P.D.,Waltrip, B.C.,Nelson, T.L.,Yonuk Chong,Williams, J.M.,Henderson, D.,Patel, P.,Palafox, L.,Behr, R. Institute of Electrical and Electronics Engineers 2007 IEEE transactions on instrumentation and measureme Vol.56 No.2
<P>We are implementing a new standard for 60 Hz power measurements based on precision sinusoidal reference voltages from two independent programmable Josephson voltage standards (PJVS): one for voltage and one for current. The National Institute of Standards and Technology PJVS systems use series arrays of Josephson junctions to produce accurate quantum-based DC voltages. Using stepwise-approximation synthesis, the PJVS systems produce sinewaves with precisely calculable RMS voltage and spectral content. We present measurements and calculations that elucidate the sources of error in the RMS voltage that are intrinsic to the digital-synthesis technique and that are due to the finite rise times and transients that occur when switching between the discrete voltages. Our goal is to reduce all error sources and uncertainty contributions from the PJVS synthesized waveforms to a few parts in 10 <SUP>7</SUP> so that the overall uncertainty in the AC-power standard is a few parts in 10<SUP>6</SUP></P>
MOA-2013-BLG-220Lb: MASSIVE PLANETARY COMPANION TO GALACTIC-DISK HOST
Yee, J. C.,Han, C.,Gould, A.,Skowron, J.,Bond, I. A.,Udalski, A.,Hundertmark, M.,Monard, L. A. G.,Porritt, I.,Nelson, P.,Bozza, V.,Albrow, M. D.,Choi, J.-Y.,Christie, G. W.,DePoy, D. L.,Gaudi, B. S.,H IOP Publishing 2014 The Astrophysical journal Vol.790 No.1
<P>We report the discovery of MOA-2013-BLG-220Lb, which has a super-Jupiter mass ratio q = 3.01 +/- 0.02 x 10(-3) relative to its host. The proper motion, mu = 12.5 +/- 1 mas yr(-1), is one of the highest for microlensing planets yet discovered, implying that it will be possible to separately resolve the host within similar to 7 yr. Two separate lines of evidence imply that the planet and host are in the Galactic disk. The planet could have been detected and characterized purely with follow-up data, which has important implications for microlensing surveys, both current and into the Large Synoptic Survey Telescope (LSST) era.</P>
BINARY MICROLENSING EVENT OGLE-2009-BLG-020 GIVES VERIFIABLE MASS, DISTANCE, AND ORBIT PREDICTIONS
Skowron, J.,Udalski, A.,Gould, A.,Dong, Subo,Monard, L. A. G.,Han, C.,Nelson, C. R.,McCormick, J.,Moorhouse, D.,Thornley, G.,Maury, A.,Bramich, D. M.,Greenhill, J.,Kozłowski, S.,Bond, I.,Poleski, R.,W IOP Publishing 2011 The Astrophysical journal Vol.738 No.1
<P>We present the first example of binary microlensing for which the parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible by a confluence of two relatively unusual circumstances. First, the binary lens is bright enough (I = 15.6) to permit Doppler measurements. Second, we measure not only the usual seven binary-lens parameters, but also the 'microlens parallax' (which yields the binary mass) and two components of the instantaneous orbital velocity. Thus, we measure, effectively, six 'Kepler+1' parameters (two instantaneous positions, two instantaneous velocities, the binary total mass, and the mass ratio). Since Doppler observations of the brighter binary component determine five Kepler parameters (period, velocity amplitude, eccentricity, phase, and position of periapsis), while the same spectroscopy yields the mass of the primary, the combined Doppler + microlensing observations would be overconstrained by 6 + (5 + 1) - (7 + 1) = 4 degrees of freedom. This makes possible an extremely strong test of the microlensing solution. We also introduce a uniform microlensing notation for single and binary lenses, define conventions, summarize all known microlensing degeneracies, and extend a set of parameters to describe full Keplerian motion of the binary lenses.</P>
Algicidal effect of hybrid peptides as potential inhibitors of harmful algal blooms
Park, S. C.,Moon, J. C.,Kim, N. H.,Kim, E. J.,Jeong, J. E.,Nelson, A. D.,Jo, B. H.,Jang, M. K.,Lee, J. R. Springer Science + Business Media 2016 Biotechnology letters Vol.38 No.5
<P>Objectives To biochemically characterize synthetic peptides to control harmful algal blooms (HABs) that cause red tides in marine water ecosystems. Results We present an analysis of several short synthetic peptides and their efficacy as algicidal agents. By altering the amino acid composition of the peptides we addressed the mode of algicidal action and determine the optimal balance of cationic and hydrophobic content for killing. In a controlled setting, these synthetic peptides disrupted both plasma and chloroplast membranes of several species known to result in HABs. This disruption was a direct result of the hydrophobic and cationic content of the peptide. Furthermore, by using an anti-HAB bioassay in scallops, we determined that these peptides were algicidal without being cytotoxic to other marine organisms. Conclusions These synthetic peptides may prove promising for general marine ecosystem remediation where HABs have become widespread and resulted in serious economic loss.</P>
Mutations in SLC26A1 Cause Nephrolithiasis
Gee, H.Y.,Jun, I.,Braun, D.A.,Lawson, J.A.,Halbritter, J.,Shril, S.,Nelson, C.P.,Tan, W.,Stein, D.,Wassner, A.J.,Ferguson, M.A.,Gucev, Z.,Sayer, J.A.,Milosevic, D.,Baum, M.,Tasic, V.,Lee, M.G.,Hildebr University of Chicago Press [etc.] 2016 American journal of human genetics Vol.98 No.6
<P>Nephrolithiasis, a condition in which urinary supersaturation leads to stone formation in the urinary system, affects about 5%-10% of individuals worldwide at some point in their lifetime and results in significant medical costs and morbidity. To date, mutations in more than 30 genes have been described as being associated with nephrolithiasis, and these mutations explain about 15% of kidney stone cases, suggesting that additional nephrolithiasis-associated genes remain to be discovered. To identify additional genes whose mutations are linked to nephrolithiasis, we performed targeted next-generation sequencing of 18 hypothesized candidate genes in 348 unrelated individuals with kidney stones. We detected biallelic mutations in SLC26A1 (solute carrier family 26 member 1) in two unrelated individuals with calcium oxalate kidney stones. We show by immunofluorescence, immunoblotting, and glycosylation analysis that the variant protein mimicking p.Thr185Met has defects in protein folding or trafficking. In addition, by measuring anion exchange activity of SLC26A1, we demonstrate that all the identified mutations in SLC26A1 result in decreased transporter activity. Our data identify SLC26A1 mutations as causing a recessive Mendelian form of nephrolithiasis.</P>