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David L. DENLINGER 한국곤충학회 2008 Entomological Research Vol.38 No.1
This review highlights a number of reasons why insect diapause merits attention. Knowledge of diapause is essential for understanding the seasonal biology of an insect species, and such information is also required for the development of effective pest management strategies; manipulating domesticated species used in pollination and silk production; developing accurate predictive models used to forecast periods of pest abundance; and increasing the shelf-life of parasitoids and predatory mites used in the biological control industry. Mechanisms used by diapausing insects to survive low temperature may provide tips for cryopreserving insect stocks, a vital need within the research community. Diapause also presents an interesting model for probing fundamental questions in development, and we are indebted to diapause studies for early insights into insect hormones. In addition, I argue that insect diapause may provide insights into questions on aging, obesity and disease transmission, and diapausing insects offer a potentially rich source of pharmaceutical agents that may contribute to improvement of human health.
Kim, Young-Soo,Denlinger, D.L.,Smith, B. Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
We have developed a new paradigm for examining classical conditioning in the flesh fly, Sarcophaga crassipalpis, and specifically apply it as a sensitive measurement for sublethal effects of cold shock. When water was applied as a conditioned stimulus to the right tarsus and reinforced with a brief opportunity to feed on a sucrose-water solution, flies quickly loam to discriminate stimulation of the right from the left tarsus. Further analyses revealed that the discrimination has a strong spatial component. Flies also retain this spatial discrimination over four days as indicated by the fact that the number of correct responses increases with continued training over that time. Cold shock ($-10^{\circ}C$ for 3 min) applied 30 and 60 min after first training interfered with learning. But, cold shock applied 120 min before or 90 min after conditioning did not significantly affect learning. The spatial memory we have identified therefore has a sensitive period during which it can be disrupted with cold shock. Furthermore, we demonstrate that the disruptive effect of cold shock on learning formation can be prevented by rapid cold hardening, a brief pre-exposure to a less severe low temperature.
Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet
Kim, Y. K.,Krupin, O.,Denlinger, J. D.,Bostwick, A.,Rotenberg, E.,Zhao, Q.,Mitchell, J. F.,Allen, J. W.,Kim, B. J. American Association for the Advancement of Scienc 2014 Science Vol.345 No.6193
<P><B>Identifying a cuprate look-alike</B></P><P>Superconductivity in cuprate compounds remains poorly understood. Recreating its features in an unrelated material may provide insight. Kim <I>et al.</I> used a spectroscopic technique to study the electronic states of the material Sr<SUB>2</SUB>IrO<SUB>4</SUB> at relatively high temperatures. They observed phenomenology similar to that of cuprates as they varied the surface carrier concentration. The study highlights the essential properties a material needs in order to exhibit cuprate-like features in the normal (nonsuperconducting) state.</P><P><I>Science</I>, this issue p. 187</P>
Young-Soo Kim,D. L. Denlinger,B. Smith 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.4
We have developed a new paradigm for examining classical conditioning in the flesh fly, Sarcophaga crassipalpis, and specifically apply it as a sensitive measurement for sublethal effects of cold shock. When water was applied as a conditioned stimulus to the right tarsus and reinforced with a brief opportunity to feed on a sucrose-water solution, flies quickly learn to discriminate stimulation of the right from the left tarsus. Further analyses revealed that the discrimination has a strong spatial component. Flies also retain this spatial discrimination over four days as indicated by the fact that the number of correct responses increases with continued training over that time. Cold shock (-10℃ for 3 min) applied 30 and 60 min after first training interfered with learning. But, cold shock applied 120 min before or 90 min after conditioning did not significantly affect learning. The spatial memory we have identified therefore has a sensitive period during which it can be disrupted with cold shock. Furthermore, we demonstrate that the disruptive effect of cold shock on learning formation can be prevented by rapid cold hardening, a brief pre-exposure to a less severe low temperature.
Nature and topology of the low-energy states inZrTe5
Moreschini, L.,Johannsen, J. C.,Berger, H.,Denlinger, J.,Jozwiack, C.,Rotenberg, E.,Kim, K. S.,Bostwick, A.,Grioni, M. American Physical Society 2016 Physical Review B Vol.94 No.8
<P>Long known for its peculiar resistivity, showing a thus far unexplained anomalous peak as a function of temperature, ZrTe5 has recently received rising attention in a somewhat different context. While both theoretical and experimental results seem to point to a nontrivial topology of the low-energy electronic states, there is no agreement on the nature of their topological character. Here, by an angle-resolved photoemission study of the evolution of the band structure with temperature and surface doping, we show that (i) the material presents a van Hove singularity close to the Fermi level, and (ii) no surface states exist at the (010) surface. These findings reconcile band structure measurements with transport results and establish the topology of this puzzling compound.</P>
Controlling spin-orbit coupling strength of bulk transition metal dichalcogenide semiconductors
이영훈,Eu Pilsun,임창영,차재훈,김성헌,Denlinger Jonathan D.,김영관 한국물리학회 2021 Current Applied Physics Vol.30 No.-
Transition metal dichalcogenide (TMD) semiconductors are attracting much attention in research regarding device physics based on their unique properties that can be utilized in spintronics and valleytronics. Although current studies concentrate on the monolayer form due to the explicitly broken inversion symmetry and the direct band gap, bulk materials also hold the capability of carrying spin and valley current. In this study, we report the methodology to continuously control the spin-orbit coupling (SOC) strength of bulk TMDs Mo1-xWxSe2 by changing the atomic ratio between Mo and W. The results show the size of band splitting at the K valley the measure of the coupling strength is linearly proportional to the atomic ratio of Mo and W. Our results thus demonstrate how to precisely tune the SOC coupling strength, and the collected information of which can serve as a reference for future applications of bulk TMDs.