The effects of prior task exposure on cardiovascular
reactivity to stress were examined in two experiments by
randomly assigning participants to repeated exposure groups
that performed mental ...arithmetic pretest and test tasks
versus delayed exposure groups that performed only the
test task after prolonged rest. Impedance cardiographic
and blood pressure measures were recorded continuously
from 60 undergraduate men in Experiment 1 and 112 undergraduate
men and women in Experiment 2. Task repetition attenuated
cardiovascular reactivity and improved task performance
in repeated exposure groups (p < .001), suggesting
an integrated process of behavioral adaptation. During
the test task, delayed exposure groups showed greater cardiac
reactivity (p < .01), but not vascular reactivity,
than repeated exposure groups. Thus, cardiac reactivity
varied as a specific function of prior task exposure, whereas
vascular reactivity varied as a general function of time.
Long-term photoexcitation experiments were performed on YBa{sub 2}Cu{sub 3}O{sub x} (x {approx} 6.6) thin films, prepared by pulsed-laser deposition on tilted SrTiO{sub 3} substrates. From the ...anisotropic resistance of the samples, the in-plane and the out-of-plane resistivities were calculated. Photoexcitation was carried out with a He-Ne laser at various temperatures from 70 K to 305 K. The authors observed that the electrical anisotropy {rho}{sub c}/{rho}{sub ab} increased at low temperatures, but decreased at high temperatures. This unusual behavior resembles that of the in-plane Hall mobility in a previous study. Possible interpretations according to the models for the photodoping effect in YBa{sub 2}Cu{sub 3}O{sub x} are discussed.
In this study, forty-six decay chains, assigned to the decay of 288115, were produced using the 243Am (48Ca, 3n) 288115 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The ...resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be 280Rg and 276Mt, respectively). Upon combining these data with those from 22 288115 decay chains observed in a similar experiment, updated level schemes in 276Mt and 272Bh (populated by the α decay of 280Rg and 276Mt, respectively) are proposed. Additionally, photons were observed in the energy range expected for K x rays coincident with the α decay of both 280Rg and 276Mt. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.
The prophenoloxidase activating system is a defense system, frequently reported both in protostomes and in deuterostomes. The final product of the phenoloxidase activity is melanin which is ...ubiquitously present throughout the metazoan kingdom. The melanin synthesis pathway starts with the amino acid aa phenylalanine which is converted to tyrosine by the phenylalanine hydroxylase PAH. We show that after allo-transplantation in the marine sponge
Geodiacydonium PAH is upregulated in the grafts. Enzyme determination studies revealed that PAH activity increases by three-fold two d after transplantation and reaches its maximum after 3 d (by 3.7-fold). This finding was supported by determining the steady-state level of the mRNA for PAH. Furthermore the cDNA, encoding this enzyme was isolated from
G. cydonium. Its deduced aa sequence encodes a protein of 51 kDa. Alignment studies indicate that the sponge PAH shares the consensus pattern as well as one characteristic pterin-binding site with the biopterin-dependent aromatic amino acid hydroxylases. Phylogenetic analysis of sponge PAH shows that all metazoan PAH fall in one group with the sponge PAH as the oldest member. The related classes of enzymes, the tyrosine hydroxylases and the tryptophan hydroxylases are statistically significantly separated from PAH; the tyrosine hydroxylase diverged as the first class from the common ancestor, a process which was calculated to have occurred ≈500 million years ago. It is concluded that in the sponge model system
G. cydonium allogeneic rejection involves an upregulation of PAH, an enzyme initiating the pathway to melanin synthesis.
Ferroelectrics for Tunable High-Power Applications Maune, H.; Kienemund, D.; Wiens, A. ...
2018 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP),
2018-July
Conference Proceeding
This paper presents recent development of ferroelectric varactors for tuning applications. While Barium-StrontiumTitanate (BST) based thick-film components have formerly been realized in planar ...interdigital (IDC) topology, low-sintering BST composites offer the possibility of metal-insulator-metal (MIM) structures. The possibilities and limits of this technology are discussed in respect to high-power applications, especially the power handling capability and linearity are considered. Thickfilm components with very high power rating of 1kW show acoustic effects, which have to be carefully considered in the design.
The Thrombolysis in Myocardial Infarction (TIMI) Phase II Trial randomized 3,339 patients to either an invasive (INV, n = 1,681) or a conservative (CON, n = 1,658) strategy after intravenous ...recombinant tissue-type plasminogen activator (rt-PA) for acute myocardial infarction.
The patients assigned to the INV strategy routinely underwent cardiac catheterization, and when anatomically appropriate, percutaneous transluminal coronary angioplasty (PTCA) or coronary artery bypass grafting 18-48 hours after infarction. CON patients had these procedures only in response to the occurrence of spontaneous or provoked ischemia. One-year follow-up data are available in 3,316 patients (99.3%). The primary trial end point, death and nonfatal reinfarction, occurred in 14.7% of INV patients and in 15.2% of CON patients (p = NS). When analyzed individually, there was no difference (p = NS) in death (INV, 6.9%; CON, 7.4%) or recurrent infarction (INV, 9.4%; CON, 9.8%) between the two groups. Anginal status at 1 year was also similar. Cardiac catheterization and PTCA were performed more often in INV (98.0% and 61.2%, respectively) compared with CON (45.2% and 20.5%, respectively) patients. At 1 year, the cumulative number of patients who underwent coronary bypass surgery (INV, 17.5%; CON, 17.3%) was similar in the two groups.
The INV and CON strategies resulted in similar favorable outcomes at 1 year of follow-up. In particular, the rates of mortality and reinfarction were not different and were impressively low in both groups. One possible advantage of the INV strategy was detected in subgroup analyses. In patients with a history of myocardial infarction, the data are suggestive that 1-year mortality was lower in INV patients (10.3%) than in CON patients (17.0%) (p = 0.03).
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