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  • American Association for the Advancement of Science (AAAS)  (14)
  • 1
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    Tunneling Spectroscopy of M3C60 Superconductors: The Energy Gap, Strong Coupling, and Superconductivity (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-12-13
    Description: Tunneling spectroscopy has been used to characterize the magnitude and temperature dependence of the superconducting energy gap (triangle up) for K(3)C(60) and Rb(3)C(60). At low temperature the reduced energy gap, 2triangle upkappaT(c) (where T(c) is the transition temperature) has a value of 5.3 +/- 0.2 and 5.2 +/- 0.3 for K(3)C(60) and Rb(3)C(60), respectively. The magnitude of the reduced gap for these materials is significantly larger than the value of 3.53 predicted by Bardeen-Cooper-Schrieffer theory. Hence, these results show that the pair-coupling interaction is strong in the M(3)C(60) superconductors. In addition, measurements of triangle up(T) for both K(3)C(60) and Rb(3)C(60) exhibit a similar mean-field temperature dependence. The characterization of triangle up and triangle up(T) for K(3)C(60) and Rb(3)C(60) provides essential constraints for theories evolving to describe superconductivity in the M(3)C(60) materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Z -- Chen, C C -- Lieber, C M -- New York, N.Y. -- Science. 1991 Dec 13;254(5038):1619-21.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17782212" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    (RbxK1-x)3C60 Superconductors: Formation of a Continuous Series of Solid Solutions (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-08-23
    Description: By means of an approach that employs alkali-metal alloys, bulk single-phase (RbxK1-x)(3)C(6O) superconductors have been prepared for all x between 0 and 1. For x = 1 it is shown that the maximum superconducting fraction, which approaches 100% in sintered pellets, occurs at a Rb to C(60) ratio of 3:1. More importantly, single-phase superconductors are formed at all intermediate values of x, and it is shown that the transition temperature (T(c)) increases linearly with x in this series of materials. The formation of a continuous range of solid solutions demonstrates that the rubidium- and potassium-doped C(60) superconducting phases must be isostructural, and furthermore, suggests that the linear increase in T(c) with x results from a chemical pressure effect.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, C C -- Kelty, S P -- Lieber, C M -- New York, N.Y. -- Science. 1991 Aug 23;253(5022):886-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17751824" target="_blank"〉PubMed〈/a〉
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  • 3
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    Abnormal coronary function in mice deficient in alpha1H T-type Ca2+ channels (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-11-25
    Description: Calcium ion (Ca2+) influx through voltage-gated Ca2+ channels is important for the regulation of vascular tone. Activation of L-type Ca2+ channels initiates muscle contraction; however, the role of T-type Ca2+ channels (T-channels) is not clear. We show that mice deficient in the alpha1H T-type Ca2+ channel (alpha(1)3.2-null) have constitutively constricted coronary arterioles and focal myocardial fibrosis. Coronary arteries isolated from alpha(1)3.2-null arteries showed normal contractile responses, but reduced relaxation in response to acetylcholine and nitroprusside. Furthermore, acute blockade of T-channels with Ni2+ prevented relaxation of wild-type coronary arteries. Thus, Ca2+ influx through alpha1H T-type Ca2+ channels is essential for normal relaxation of coronary arteries.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Chien-Chang -- Lamping, Kathryn G -- Nuno, Daniel W -- Barresi, Rita -- Prouty, Sally J -- Lavoie, Julie L -- Cribbs, Leanne L -- England, Sarah K -- Sigmund, Curt D -- Weiss, Robert M -- Williamson, Roger A -- Hill, Joseph A -- Campbell, Kevin P -- New York, N.Y. -- Science. 2003 Nov 21;302(5649):1416-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Iowa, Iowa City, IA 52242, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14631046" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/pharmacology ; Animals ; Arteries/drug effects/*physiology ; Calcium/*metabolism ; Calcium Channels, T-Type/genetics/*physiology ; Coronary Vessels/drug effects/pathology/*physiology ; Echocardiography ; Electrocardiography ; Endothelium, Vascular/drug effects/physiology ; Female ; Fibrosis ; Ganglia, Spinal/cytology ; Gene Targeting ; Heart/physiology ; Heart Rate ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Muscle, Smooth, Vascular/physiology ; Myocardium/pathology ; Neurons/metabolism ; Nickel/pharmacology ; Nitric Oxide/physiology ; Nitric Oxide Donors/pharmacology ; Nitroprusside/pharmacology ; Patch-Clamp Techniques ; Vasoconstriction/drug effects ; *Vasodilation/drug effects
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Mast cells can enhance resistance to snake and honeybee venoms (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-07-29
    Description: Snake or honeybee envenomation can cause substantial morbidity and mortality, and it has been proposed that the activation of mast cells by snake or insect venoms can contribute to these effects. We show, in contrast, that mast cells can significantly reduce snake-venom-induced pathology in mice, at least in part by releasing carboxypeptidase A and possibly other proteases, which can degrade venom components. Mast cells also significantly reduced the morbidity and mortality induced by honeybee venom. These findings identify a new biological function for mast cells in enhancing resistance to the morbidity and mortality induced by animal venoms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Metz, Martin -- Piliponsky, Adrian M -- Chen, Ching-Cheng -- Lammel, Verena -- Abrink, Magnus -- Pejler, Gunnar -- Tsai, Mindy -- Galli, Stephen J -- P50 HL067674/HL/NHLBI NIH HHS/ -- P50 HL67674/HL/NHLBI NIH HHS/ -- R01 AI023990/AI/NIAID NIH HHS/ -- R01 CA072074/CA/NCI NIH HHS/ -- R01 CA72074/CA/NCI NIH HHS/ -- R37 AI23990/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2006 Jul 28;313(5786):526-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305-5324, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16873664" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bee Venoms/*antagonists & inhibitors/toxicity ; Carboxypeptidases A/antagonists & inhibitors/*metabolism ; Cell Degranulation ; Chymases ; Crotalid Venoms/*antagonists & inhibitors/metabolism/toxicity ; Hypothermia/etiology ; Immunity, Innate ; Mast Cells/enzymology/immunology/*physiology ; Mice ; Mice, Inbred C57BL ; Peptide Hydrolases/metabolism ; Peritoneal Cavity/cytology ; Plant Proteins/pharmacology ; Protease Inhibitors ; Serine Endopeptidases/metabolism ; Viper Venoms/*antagonists & inhibitors/metabolism/toxicity
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Size Dependence of Structural Metastability in Semiconductor Nanocrystals (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-04-18
    Description: The kinetics of a first-order, solid-solid phase transition were investigated in the prototypical nanocrystal system CdSe as a function of crystallite size. In contrast to extended solids, nanocrystals convert from one structure to another by single nucleation events, and the transformations obey simple unimolecular kinetics. Barrier heights were observed to increase with increasing nanocrystal size, although they also depend on the nature of the nanocrystal surface. These results are analogous to magnetic phase transitions in nanocrystals and suggest general rules that may be of use in the discovery of new metastable phases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen -- Herhold -- Johnson -- Alivisatos -- New York, N.Y. -- Science. 1997 Apr 18;276(5311):398-401.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9103194" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 6
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    Self-organizing and stochastic behaviors during the regeneration of hair stem cells (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-04-30
    Description: Stem cells cycle through active and quiescent states. Large populations of stem cells in an organ may cycle randomly or in a coordinated manner. Although stem cell cycling within single hair follicles has been studied, less is known about regenerative behavior in a hair follicle population. By combining predictive mathematical modeling with in vivo studies in mice and rabbits, we show that a follicle progresses through cycling stages by continuous integration of inputs from intrinsic follicular and extrinsic environmental signals based on universal patterning principles. Signaling from the WNT/bone morphogenetic protein activator/inhibitor pair is coopted to mediate interactions among follicles in the population. This regenerative strategy is robust and versatile because relative activator/inhibitor strengths can be modulated easily, adapting the organism to different physiological and evolutionary needs.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3321266/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3321266/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plikus, Maksim V -- Baker, Ruth E -- Chen, Chih-Chiang -- Fare, Clyde -- de la Cruz, Damon -- Andl, Thomas -- Maini, Philip K -- Millar, Sarah E -- Widelitz, Randall -- Chuong, Cheng-Ming -- AR47364/AR/NIAMS NIH HHS/ -- AR60306/AR/NIAMS NIH HHS/ -- R01 AR042177/AR/NIAMS NIH HHS/ -- R01 AR042177-17/AR/NIAMS NIH HHS/ -- R01 AR042177-18/AR/NIAMS NIH HHS/ -- R01 AR060306/AR/NIAMS NIH HHS/ -- R01 AR060306-02/AR/NIAMS NIH HHS/ -- R01 AR060306-03/AR/NIAMS NIH HHS/ -- R01-AR42177/AR/NIAMS NIH HHS/ -- R01-AR47709/AR/NIAMS NIH HHS/ -- New York, N.Y. -- Science. 2011 Apr 29;332(6029):586-9. doi: 10.1126/science.1201647.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of Southern California (USC), Los Angeles, CA 90033, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21527712" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Morphogenetic Proteins/*metabolism ; Computer Simulation ; Hair Follicle/*cytology/*growth & development/metabolism ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Models, Biological ; Rabbits ; *Regeneration ; *Signal Transduction ; Stem Cells/*physiology ; Stochastic Processes ; Wnt Proteins/*metabolism
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    Electronic ISSN: 1095-9203
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  • 7
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    Visualizing long-term memory formation in two neurons of the Drosophila brain (2012)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2012-02-11
    Description: Long-term memory (LTM) depends on the synthesis of new proteins. Using a temperature-sensitive ribosome-inactivating toxin to acutely inhibit protein synthesis, we screened individual neurons making new proteins after olfactory associative conditioning in Drosophila. Surprisingly, LTM was impaired after inhibiting protein synthesis in two dorsal-anterior-lateral (DAL) neurons but not in the mushroom body (MB), which is considered the adult learning and memory center. Using a photoconvertible fluorescent protein KAEDE to report de novo protein synthesis, we have directly visualized cyclic adenosine monophosphate (cAMP) response element-binding protein (CREB)-dependent transcriptional activation of calcium/calmodulin-dependent protein kinase II and period genes in the DAL neurons after spaced but not massed training. Memory retention was impaired by blocking neural output in DAL during retrieval but not during acquisition or consolidation. These findings suggest an extra-MB memory circuit in Drosophila: LTM consolidation (MB to DAL), storage (DAL), and retrieval (DAL to MB).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Chun-Chao -- Wu, Jie-Kai -- Lin, Hsuan-Wen -- Pai, Tsung-Pin -- Fu, Tsai-Feng -- Wu, Chia-Lin -- Tully, Tim -- Chiang, Ann-Shyn -- New York, N.Y. -- Science. 2012 Feb 10;335(6069):678-85. doi: 10.1126/science.1212735.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biotechnology and Department of Life Science, National Tsing Hua University, Hsinchu 30013, Taiwan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22323813" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Axons/ultrastructure ; Brain/cytology/physiology ; Calcium-Calmodulin-Dependent Protein Kinase Type 2/biosynthesis/genetics ; Conditioning (Psychology) ; Cryptochromes/biosynthesis/genetics ; Cyclic AMP Response Element-Binding Protein/genetics/metabolism ; Drosophila/cytology/genetics/*physiology ; Drosophila Proteins/*biosynthesis/genetics/metabolism ; Gene Expression Profiling ; Gene Expression Regulation ; Genes, Insect ; Luminescent Proteins/biosynthesis/genetics ; Memory, Long-Term/*physiology ; Mushroom Bodies/*physiology ; Neurons/*physiology/ultrastructure ; Odors ; Period Circadian Proteins/biosynthesis/genetics ; Ricin/pharmacology ; Sensory Receptor Cells/physiology ; Serine Endopeptidases/biosynthesis/genetics ; Trans-Activators/genetics/metabolism ; Transcriptional Activation
    Print ISSN: 0036-8075
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  • 8
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    Ebola virus. Two-pore channels control Ebola virus host cell entry and are drug targets for disease treatment (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-02-28
    Description: Ebola virus causes sporadic outbreaks of lethal hemorrhagic fever in humans, but there is no currently approved therapy. Cells take up Ebola virus by macropinocytosis, followed by trafficking through endosomal vesicles. However, few factors controlling endosomal virus movement are known. Here we find that Ebola virus entry into host cells requires the endosomal calcium channels called two-pore channels (TPCs). Disrupting TPC function by gene knockout, small interfering RNAs, or small-molecule inhibitors halted virus trafficking and prevented infection. Tetrandrine, the most potent small molecule that we tested, inhibited infection of human macrophages, the primary target of Ebola virus in vivo, and also showed therapeutic efficacy in mice. Therefore, TPC proteins play a key role in Ebola virus infection and may be effective targets for antiviral therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4550587/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4550587/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sakurai, Yasuteru -- Kolokoltsov, Andrey A -- Chen, Cheng-Chang -- Tidwell, Michael W -- Bauta, William E -- Klugbauer, Norbert -- Grimm, Christian -- Wahl-Schott, Christian -- Biel, Martin -- Davey, Robert A -- R01 AI063513/AI/NIAID NIH HHS/ -- R01AI063513/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2015 Feb 27;347(6225):995-8. doi: 10.1126/science.1258758.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Texas Biomedical Research Institute, San Antonio, TX, USA. ; The University of Texas Medical Branch, Galveston, TX, USA. ; Center for Integrated Protein Science Munich (CIPSM) at the Department of Pharmacy-Center for Drug Research, Ludwig-Maximilians-Universitat Munchen, Munich, Germany. ; Southwest Research Institute, San Antonio, TX, USA. ; Institute for Experimental and Clinical Pharmacology and Toxicology, Albert-Ludwigs-Universitat Freiburg, Freiburg, Germany. ; Texas Biomedical Research Institute, San Antonio, TX, USA. rdavey@txbiomed.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25722412" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antiviral Agents/*pharmacology/therapeutic use ; BALB 3T3 Cells ; Benzylisoquinolines/pharmacology/therapeutic use ; Calcium Channel Blockers/*pharmacology/therapeutic use ; Calcium Channels/genetics/*physiology ; Ebolavirus/drug effects/*physiology ; Female ; Gene Knockout Techniques ; HeLa Cells ; Hemorrhagic Fever, Ebola/drug therapy/*therapy/virology ; Humans ; Macrophages/drug effects/virology ; Mice ; *Molecular Targeted Therapy ; NADP/analogs & derivatives/metabolism ; RNA Interference ; Signal Transduction ; Verapamil/pharmacology/therapeutic use ; Virus Internalization/*drug effects
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Synthesis of todorokite (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-02-14
    Description: Todorokite of chemical composition (Mg(0.77)Na(0.03))(Mg(0.18)Mn(2+)(0.60)Mn(4+)(5.22)22) O(12).3.07 H(2)O was synthesized by a two-step procedure. First, sodium birnessite was synthesized and magnesium was exchanged for sodium to form magnesium birnessite, which was autoclaved under a saturated steam pressure at 155 degrees C for 8 hours to form well-crystallized todorokite. Synthesized todorokite particles consisted of fibers extending from a central plate. The plate itself was made of twinned fibers forming a trilling pattern. The infrared spectra and x-ray diffraction patterns were similar to those of natural todorokite samples. Calcium birnessite and nickel birnessite, when autoclaved under conditions similar to those for magnesium birnessite, yielded a todorokite structure. However, the formation of todorokite from calcium and nickel birnessite was less extensive.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Golden, D C -- Chen, C C -- Dixon, J B -- New York, N.Y. -- Science. 1986 Feb 14;231(4739):717-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17800797" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Evidence for a strain-tuned topological phase transition in ZrTe5 (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉A phase transition between topologically distinct insulating phases involves closing and reopening the bandgap. Near the topological phase transition, the bulk energy spectrum is characterized by a massive Dirac dispersion, where the bandgap plays the role of mass. We report measurements of strain dependence of electrical transport properties of ZrTe〈sub〉5〈/sub〉, which is known to host massive Dirac fermions in the bulk due to its proximity to a topological phase transition. We observe that the resistivity exhibits a pronounced minimum at a critical strain. We further find that the positive longitudinal magnetoconductance becomes maximal at the critical strain. This nonmonotonic strain dependence is consistent with the switching of sign of the Dirac mass and, hence, a strain-tuned topological phase transition in ZrTe〈sub〉5〈/sub〉.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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