GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Asymmetric excitation of surface plasmons by dark mode coupling (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-02-21
    Description: Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Out of Tibet: Pliocene woolly rhino suggests high-plateau origin of Ice Age megaherbivores (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-09-03
    Description: Ice Age megafauna have long been known to be associated with global cooling during the Pleistocene, and their adaptations to cold environments, such as large body size, long hair, and snow-sweeping structures, are best exemplified by the woolly mammoths and woolly rhinos. These traits were assumed to have evolved as a response to the ice sheet expansion. We report a new Pliocene mammal assemblage from a high-altitude basin in the western Himalayas, including a primitive woolly rhino. These new Tibetan fossils suggest that some megaherbivores first evolved in Tibet before the beginning of the Ice Age. The cold winters in high Tibet served as a habituation ground for the megaherbivores, which became preadapted for the Ice Age, successfully expanding to the Eurasian mammoth steppe.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Deng, Tao -- Wang, Xiaoming -- Fortelius, Mikael -- Li, Qiang -- Wang, Yang -- Tseng, Zhijie J -- Takeuchi, Gary T -- Saylor, Joel E -- Saila, Laura K -- Xie, Guangpu -- New York, N.Y. -- Science. 2011 Sep 2;333(6047):1285-8. doi: 10.1126/science.1206594.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21885780" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; *Altitude ; Animals ; *Biological Evolution ; *Cold Climate ; *Fossils ; *Ice Cover ; Mammals/*anatomy & histology/classification ; Mandible/anatomy & histology ; Perissodactyla/*anatomy & histology/classification ; Phylogeny ; Seasons ; Skull/anatomy & histology ; Tibet ; Tooth/anatomy & histology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Switchable counterion gradients around charged metallic nanoparticles enable reception of radio waves (2018)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2018-10-13
    Description: Mechanically flexible, easy-to-process, and environmentally benign materials capable of current rectification are interesting alternatives to "hard" silicon-based devices. Among these materials are metallic/charged-organic nanoparticles in which electronic currents though metal cores are modulated by the gradients of counterions surrounding the organic ligands. Although layers of oppositely charged particles can respond to both electronic and chemical signals and can function even under significant mechanical deformation, the rectification ratios of these "chemoelectronic" elements have been, so far, low. This work shows that significantly steeper counterion gradients and significantly higher rectification ratios can be achieved with nanoparticles of only one polarity but in contact with a porous electrode serving as a counterion "sink." These composite structures act as rectifiers even at radio frequencies, providing a new means of interfacing counterions’ dynamics with high-frequency electronic currents.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    H7N9 influenza viruses are transmissible in ferrets by respiratory droplet (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-07-23
    Description: A newly emerged H7N9 virus has caused 132 human infections with 37 deaths in China since 18 February 2013. Control measures in H7N9 virus-positive live poultry markets have reduced the number of infections; however, the character of the virus, including its pandemic potential, remains largely unknown. We systematically analyzed H7N9 viruses isolated from birds and humans. The viruses were genetically closely related and bound to human airway receptors; some also maintained the ability to bind to avian airway receptors. The viruses isolated from birds were nonpathogenic in chickens, ducks, and mice; however, the viruses isolated from humans caused up to 30% body weight loss in mice. Most importantly, one virus isolated from humans was highly transmissible in ferrets by respiratory droplet. Our findings indicate nothing to reduce the concern that these viruses can transmit between humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Qianyi -- Shi, Jianzhong -- Deng, Guohua -- Guo, Jing -- Zeng, Xianying -- He, Xijun -- Kong, Huihui -- Gu, Chunyang -- Li, Xuyong -- Liu, Jinxiong -- Wang, Guojun -- Chen, Yan -- Liu, Liling -- Liang, Libin -- Li, Yuanyuan -- Fan, Jun -- Wang, Jinliang -- Li, Wenhui -- Guan, Lizheng -- Li, Qimeng -- Yang, Huanliang -- Chen, Pucheng -- Jiang, Li -- Guan, Yuntao -- Xin, Xiaoguang -- Jiang, Yongping -- Tian, Guobin -- Wang, Xiurong -- Qiao, Chuanling -- Li, Chengjun -- Bu, Zhigao -- Chen, Hualan -- New York, N.Y. -- Science. 2013 Jul 26;341(6144):410-4. doi: 10.1126/science.1240532. Epub 2013 Jul 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, People's Republic of China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23868922" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chickens/virology ; Columbidae/virology ; Ducks/virology ; Ferrets/*virology ; Genes, Viral ; Hemagglutinin Glycoproteins, Influenza Virus/chemistry/genetics/metabolism ; Humans ; Influenza A virus/genetics/isolation & purification/*pathogenicity/physiology ; Influenza in Birds/virology ; Influenza, Human/*transmission/*virology ; Mice ; Mice, Inbred BALB C ; Molecular Sequence Data ; Mutation ; Orthomyxoviridae Infections/*transmission/*virology ; Receptors, Cell Surface/metabolism ; Receptors, Virus/metabolism ; Respiratory System/*virology ; Virus Replication
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    The antiproliferative action of progesterone in uterine epithelium is mediated by Hand2 (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-02-19
    Description: During pregnancy, progesterone inhibits the growth-promoting actions of estrogen in the uterus. However, the mechanism for this is not clear. The attenuation of estrogen-mediated proliferation of the uterine epithelium by progesterone is a prerequisite for successful implantation. Our study reveals that progesterone-induced expression of the basic helix-loop-helix transcription factor Hand2 in the uterine stroma suppresses the production of several fibroblast growth factors (FGFs) that act as paracrine mediators of mitogenic effects of estrogen on the epithelium. In mouse uteri lacking Hand2, continued induction of these FGFs in the stroma maintains epithelial proliferation and stimulates estrogen-induced pathways, resulting in impaired implantation. Thus, Hand2 is a critical regulator of the uterine stromal-epithelial communication that directs proper steroid regulation conducive for the establishment of pregnancy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3320855/" 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/PMC3320855/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Quanxi -- Kannan, Athilakshmi -- DeMayo, Francesco J -- Lydon, John P -- Cooke, Paul S -- Yamagishi, Hiroyuki -- Srivastava, Deepak -- Bagchi, Milan K -- Bagchi, Indrani C -- U54 HD055787-01A1/HD/NICHD NIH HHS/ -- U54HD055787/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 2011 Feb 18;331(6019):912-6. doi: 10.1126/science.1197454.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Comparative Biosciences, University of Illinois Urbana/Champaign, Urbana, IL 61820, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21330545" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Basic Helix-Loop-Helix Transcription Factors/*genetics/*metabolism ; Cell Proliferation ; Embryo Implantation/*physiology ; Endometrium/drug effects/*metabolism ; Epithelial Cells/cytology/drug effects/metabolism ; Epithelium/metabolism ; Estradiol/metabolism ; Estrogen Receptor alpha/metabolism ; Extracellular Signal-Regulated MAP Kinases/metabolism ; Female ; Fibroblast Growth Factors/genetics/*metabolism ; Gene Expression Profiling ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Mifepristone/pharmacology ; Mucin-1/metabolism ; Phosphorylation ; Pregnancy ; Progesterone/antagonists & inhibitors/*metabolism/pharmacology ; Receptors, Fibroblast Growth Factor/metabolism ; Receptors, Progesterone/metabolism ; *Signal Transduction ; Stromal Cells/cytology/metabolism ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    Satellite-based entanglement distribution over 1200 kilometers (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-06-16
    Description: Long-distance entanglement distribution is essential for both foundational tests of quantum physics and scalable quantum networks. Owing to channel loss, however, the previously achieved distance was limited to ~100 kilometers. Here we demonstrate satellite-based distribution of entangled photon pairs to two locations separated by 1203 kilometers on Earth, through two satellite-to-ground downlinks with a summed length varying from 1600 to 2400 kilometers. We observed a survival of two-photon entanglement and a violation of Bell inequality by 2.37 ± 0.09 under strict Einstein locality conditions. The obtained effective link efficiency is orders of magnitude higher than that of the direct bidirectional transmission of the two photons through telecommunication fibers.
    Keywords: Physics, Applied, Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Rapid and near-complete dissolution of wood lignin at (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-09-16
    Description: We report the discovery of the hydrotropic properties of a recyclable aromatic acid, p -toluenesulfonic acid ( p -TsOH), for potentially low-cost and efficient fractionation of wood through rapid and near-complete dissolution of lignin. Approximately 90% of poplar wood (NE222) lignin can be dissolved at 80°C in 20 min. Equivalent delignification using known hydrotropes, such as aromatic salts, can be achieved only at 150°C or higher for more than 10 hours or at 150°C for 2 hours with alkaline pulping. p -TsOH fractionated wood into two fractions: (i) a primarily cellulose-rich water-insoluble solid fraction that can be used for the production of high-value building blocks, such as dissolving pulp fibers, lignocellulosic nanomaterials, and/or sugars through subsequent enzymatic hydrolysis; and (ii) a spent acid liquor stream containing mainly dissolved lignin that can be easily precipitated as lignin nanoparticles by diluting the spent acid liquor to below the minimal hydrotrope concentration. Our nuclear magnetic resonance analyses of the dissolved lignin revealed that p -TsOH can depolymerize lignin via ether bond cleavage and can separate carbohydrate-free lignin from the wood. p -TsOH has a relatively low water solubility, which can facilitate efficient recovery using commercially proven crystallization technology by cooling the concentrated spent acid solution to ambient temperatures to achieve environmental sustainability through recycling of p -TsOH.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    High-density array of ferroelectric nanodots with robust and reversibly switchable topological domain states (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-08-19
    Description: The exotic topological domains in ferroelectrics and multiferroics have attracted extensive interest in recent years due to their novel functionalities and potential applications in nanoelectronic devices. One of the key challenges for these applications is a realization of robust yet reversibly switchable nanoscale topological domain states with high density, wherein spontaneous topological structures can be individually addressed and controlled. This has been accomplished in our work using high-density arrays of epitaxial BiFeO 3 (BFO) ferroelectric nanodots with a lateral size as small as ~60 nm. We demonstrate various types of spontaneous topological domain structures, including center-convergent domains, center-divergent domains, and double-center domains, which are stable over sufficiently long time but can be manipulated and reversibly switched by electric field. The formation mechanisms of these topological domain states, assisted by the accumulation of compensating charges on the surface, have also been revealed. These results demonstrated that these reversibly switchable topological domain arrays are promising for applications in high-density nanoferroelectric devices such as nonvolatile memories.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    CH3NH3PbI3 perovskites: Ferroelasticity revealed (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-04-15
    Description: Ferroelectricity has been proposed as a plausible mechanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support of this hypothesis is still missing. Identifying and distinguishing ferroelectricity from other properties, such as piezoelectricity, ferroelasticity, etc., is typically nontrivial because these phenomena can coexist in many materials. In this work, a combination of microscopic and nanoscale techniques provides solid evidence for the existence of ferroelastic domains in both CH 3 NH 3 PbI 3 polycrystalline films and single crystals in the pristine state and under applied stress. Experiments show that the configuration of CH 3 NH 3 PbI 3 ferroelastic domains in single crystals and polycrystalline films can be controlled with applied stress, suggesting that strain engineering may be used to tune the properties of this material. No evidence of concomitant ferroelectricity was observed. Because grain boundaries have an impact on the long-term stability of organic-inorganic perovskite devices, and because the ferroelastic domain boundaries may differ from regular grain boundaries, the discovery of ferroelasticity provides a new variable to consider in the quest for improving their stability and enabling their widespread adoption.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    GSK3-TIP60-ULK1 signaling pathway links growth factor deprivation to autophagy (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-04-28
    Description: In metazoans, cells depend on extracellular growth factors for energy homeostasis. We found that glycogen synthase kinase-3 (GSK3), when deinhibited by default in cells deprived of growth factors, activates acetyltransferase TIP60 through phosphorylating TIP60-Ser(86), which directly acetylates and stimulates the protein kinase ULK1, which is required for autophagy. Cells engineered to express TIP60(S86A) that cannot be phosphorylated by GSK3 could not undergo serum deprivation-induced autophagy. An acetylation-defective mutant of ULK1 failed to rescue autophagy in ULK1(-/-) mouse embryonic fibroblasts. Cells used signaling from GSK3 to TIP60 and ULK1 to regulate autophagy when deprived of serum but not glucose. These findings uncover an activating pathway that integrates protein phosphorylation and acetylation to connect growth factor deprivation to autophagy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Shu-Yong -- Li, Terytty Yang -- Liu, Qing -- Zhang, Cixiong -- Li, Xiaotong -- Chen, Yan -- Zhang, Shi-Meng -- Lian, Guili -- Liu, Qi -- Ruan, Ka -- Wang, Zhen -- Zhang, Chen-Song -- Chien, Kun-Yi -- Wu, Jiawei -- Li, Qinxi -- Han, Jiahuai -- Lin, Sheng-Cai -- New York, N.Y. -- Science. 2012 Apr 27;336(6080):477-81. doi: 10.1126/science.1217032.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Fujian, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22539723" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Autophagy ; Cell Line ; Cell Line, Tumor ; Culture Media ; Culture Media, Serum-Free ; Glucose/metabolism ; Glycogen Synthase Kinase 3/genetics/*metabolism ; HEK293 Cells ; Histone Acetyltransferases/genetics/*metabolism ; Humans ; Intercellular Signaling Peptides and Proteins/metabolism ; Intracellular Signaling Peptides and Proteins/genetics/*metabolism ; Mice ; Phosphorylation ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; Rats ; *Signal Transduction ; Trans-Activators/genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...