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https://www.readbyqxmd.com/read/28339253/distinct-evolutions-of-weyl-fermion-quasiparticles-and-fermi-arcs-with-bulk-band-topology-in-weyl-semimetals
#1
N Xu, G Autès, C E Matt, B Q Lv, M Y Yao, F Bisti, V N Strocov, D Gawryluk, E Pomjakushina, K Conder, N C Plumb, M Radovic, T Qian, O V Yazyev, J Mesot, H Ding, M Shi
The Weyl semimetal phase is a recently discovered topological quantum state of matter characterized by the presence of topologically protected degeneracies near the Fermi level. These degeneracies are the source of exotic phenomena, including the realization of chiral Weyl fermions as quasiparticles in the bulk and the formation of Fermi arc states on the surfaces. Here, we demonstrate that these two key signatures show distinct evolutions with the bulk band topology by performing angle-resolved photoemission spectroscopy, supported by first-principles calculations, on transition-metal monophosphides...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28337633/the-development-of-an-hiv-risk-environment-scale-of-exotic-dance-clubs
#2
Susan G Sherman, Meredith R Brantley, Carla Zelaya, Quyen Duong, Ralph B Taylor, Jon M Ellen
Exotic dancers have received little research attention despite evidence of high-risk behaviours within exotic dance clubs (EDCs). We developed and assessed the reliability and validity of a risk environment score, examining differences between dancers (n = 107) and other staff (n = 172). In the summer of 2013, anonymous surveys were administered via A-CASI in EDCs (N = 26) in Baltimore among exotic dancers and staff. Surveys consisted of a brief demographic section followed by 65 statements. The overall domain had an alpha = 0...
March 23, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28335286/enhanced-end-contacts-by-helium-ion-bombardment-to-improve-graphene-metal-contacts
#3
Kunpeng Jia, Yajuan Su, Jun Zhan, Kashif Shahzad, Huilong Zhu, Chao Zhao, Jun Luo
Low contact resistance between graphene and metals is of paramount importance to fabricate high performance graphene-based devices. In this paper, the impact of both defects induced by helium ion (He⁺) bombardment and annealing on the contact resistance between graphene and various metals (Ag, Pd, and Pt) were systematically explored. It is found that the contact resistances between all metals and graphene are remarkably reduced after annealing, indicating that not only chemically adsorbed metal (Pd) but also physically adsorbed metals (Ag and Pt) readily form end-contacts at intrinsic defect locations in graphene...
August 26, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334128/trap-height-affects-capture-of-lady-beetles-coleoptera-coccinellidae-in-pecan-orchards
#4
T E Cottrell
There is scarce information regarding the vertical stratification of predaceous Coccinellidae in tall trees. Although numerous studies have been done in orchards and forests, very few studies have assessed the occurrence of predaceous Coccinellidae high in tree canopies. The objective of this study was to examine the abundance of Coccinellidae at different heights in mature pecan, Carya illinoinensis (Wangenh.) K. Koch, orchards with tall trees. From spring through late fall during 2013 and 2014, yellow pyramidal Tedders traps were suspended in the pecan canopy at 6...
February 17, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28332652/the-impact-of-importation-of-live-ruminants-on-the-epizootiology-of-foot-and-mouth-disease-in-saudi-arabia
#5
I H A Abd El-Rahim, A H Asghar, A M Mohamed, S M Fat'hi
Approximately five million live ruminants are imported annually into Saudi Arabia. The majority of these animals are imported shortly before the pilgrimage season from Sudan and the Horn of Africa, where foot and mouth disease (FMD) is known to be enzootic. This study was designed to investigate the impact of the importation of these live ruminants on the epizootiology of FMD in Saudi Arabia. The authors carried out antibody testing on a total of 480 sheep and 233 cattle from the sacrificial livestock yards of the Saudi Project for Utilization of Hajj Meat, which performs ritual slaughter on behalf of pilgrims in the Holy City of Makkah...
December 2016: Revue Scientifique et Technique
https://www.readbyqxmd.com/read/28332651/serosurveillance-and-factors-associated-with-the-presence-of-antibodies-against-bluetongue-virus-in-dairy-cattle-in-two-eco-zones-of-nepal
#6
T N Gaire, S Karki, I P Dhakal, D R Khanal, R A Bowen
Cattle play an important role in the epidemiology of bluetongue (BT) by acting as reservoir hosts. However, the status of BT virus (BTV) in dairy cattle in Nepal is unknown. The objective of this study was to estimate the prevalence of BTV antibodies in dairy cattle in two eco-zones of Nepal, and to identify the factors associated with virus exposure. The authors conducted a cross-sectional serosurvey from March 2012 through February 2013 by sampling 131 dairy cattle from seven clusters (villages) in the Chitwan district in the Terai region (southern lowlands) and the Lamjung district in the Hills region (the middle part of Nepal)...
December 2016: Revue Scientifique et Technique
https://www.readbyqxmd.com/read/28332487/observation-of-the-reversed-cherenkov-radiation
#7
Zhaoyun Duan, Xianfeng Tang, Zhanliang Wang, Yabin Zhang, Xiaodong Chen, Min Chen, Yubin Gong
Reversed Cherenkov radiation is the exotic electromagnetic radiation that is emitted in the opposite direction of moving charged particles in a left-handed material. Reversed Cherenkov radiation has not previously been observed, mainly due to the absence of both suitable all-metal left-handed materials for beam transport and suitable couplers for extracting the reversed Cherenkov radiation signal. In this paper, we develop an all-metal metamaterial, consisting of a square waveguide loaded with complementary electric split ring resonators...
March 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28331590/when-perception-reflects-reality-non-native-grass-invasion-alters-small-mammal-risk-landscapes-and-survival
#8
Joseph P Ceradini, Anna D Chalfoun
Modification of habitat structure due to invasive plants can alter the risk landscape for wildlife by, for example, changing the quality or availability of refuge habitat. Whether perceived risk corresponds with actual fitness outcomes, however, remains an important open question. We simultaneously measured how habitat changes due to a common invasive grass (cheatgrass, Bromus tectorum) affected the perceived risk, habitat selection, and apparent survival of a small mammal, enabling us to assess how well perceived risk influenced important behaviors and reflected actual risk...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28330167/genetic-characterization-of-moroccan-and-the-exotic-bread-wheat-cultivars-using-functional-and-random-dna-markers-linked-to-the-agronomic-traits-for-genomics-assisted-improvement
#9
Fatima Henkrar, Jamal El-Haddoury, Hassan Ouabbou, Najib Bendaou, Sripada M Udupa
Genetic characterization, diversity analysis and estimate of the genetic relationship among varieties using functional and random DNA markers linked to agronomic traits can provide relevant guidelines in selecting parents and designing new breeding strategies for marker-assisted wheat cultivar improvement. Here, we characterize 20 Moroccan and 19 exotic bread wheat (Triticum aestivum L.) cultivars using 47 functional and 7 linked random DNA markers associated with 21 loci of the most important traits for wheat breeding...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28327996/genome-sequencing-of-the-sweetpotato-whitefly-bemsia-tabaci-med-q
#10
Wen Xie, Chunhai Chen, Zezhong Yang, Litao Guo, Xin Yang, Dan Wang, Ming Chen, Jinqun Huang, Yanan Wen, Yang Zeng, Yating Liu, Jixing Xia, Lixia Tian, Hongying Cui, Qingjun Wu, Shaoli Wang, Baoyun Xu, Xianchun Li, Xinqiu Tan, Murad Ghanim, Baoli Qiu, Huipeng Pan, Dong Chu, Helene Delatte, M N Maruthi, Feng Ge, Xueping Zhou, Xiaowei Wang, Fanghao Wan, Yuzhou Du, Chen Luo, Fengming Yan, Evan L Preisser, Xiaoguo Jiao, Brad S Coates, Jinyang Zhao, Qiang Gao, Jinquan Xia, Ye Yin, Yong Liu, Judith K Brown, Xuguo Joe Zhou, Youjun Zhang
Background: The sweetpotato whitefly Bemisia tabaci is a highly destructive agricultural and ornamental crop pest. It damages host plants through both phloem feeding and vectoring plant pathogens. Introductions of B. tabaci are difficult to quarantine and eradicate because of its high reproductive rates, broad host plant range, and insecticide resistance. Findings: A total of 791 Gb of raw DNA sequence from whole genome shotgun sequencing, and 13 BAC pooling libraries were generated by Illumina sequencing using different combinations of mate-pair and pair-end libraries...
March 15, 2017: GigaScience
https://www.readbyqxmd.com/read/28327477/the-mental-healthcare-bill-2016-exotic-in-nature-quixotic-in-scope-%C3%A2-but-let-s-take-the-plunge-shall-we
#11
EDITORIAL
Nitin Gupta, Debasish Basu
No abstract text is available yet for this article.
November 2016: National Medical Journal of India
https://www.readbyqxmd.com/read/28326011/the-virtual-trial
#12
Willem de Haan
Although brain network analysis in neurodegenerative disease is still a fairly young discipline, expectations are high. The robust theoretical basis, the straightforward detection and explanation of otherwise intangible complex system phenomena, and the correlations of network features with pathology and cognitive status are qualities that show the potential power of this new instrument. We expect "connectomics" to eventually better explain and predict that essential but still poorly understood aspect of dementia: the relation between pathology and cognitive symptoms...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28325976/arthropod-and-oligochaete-assemblages-from-grasslands-of-the-southern-kenai-peninsula-alaska
#13
Matthew L Bowser, John M Morton, John Delton Hanson, Dawn R Magness, Mallory Okuly
BACKGROUND: By the end of this century, the potential climate-biome of the southern Kenai Peninsula is forecasted to change from transitional boreal forest to prairie and grasslands, a scenario that may already be playing out in the Caribou Hills region. Here, spruce (Picea × lutzii Little [glauca × sitchensis]) forests were heavily thinned by an outbreak of the spruce bark beetle (Dendroctonus rufipennis (Kirby, 1837)) and replaced by the native but invasive grass species, Calamagrostis canadensis (Michx...
2017: Biodiversity Data Journal
https://www.readbyqxmd.com/read/28325829/effects-of-seed-density-and-proximity-to-refuge-habitat-on-seed-predation-rates-for-a-rare-and-a-common-lupinus-species
#14
Eleanor A Pardini, Melissa V Patten, Tiffany M Knight
PREMISE OF THE STUDY: Biotic interactions such as seed predation can play a role in explaining patterns of abundance among plant species. The effect of seed predation will depend on how the strength of predation differs across species and environments, and on the degree to which seed loss at one life-cycle phase increases fitness at another phase. Few studies have simultaneously quantified predispersal and postdispersal predation in co-occurring rare and common congeners, despite the value of estimating both for understanding causes of rarity...
March 21, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28323631/search-for-unconventional-superconductors-among-the-y-i-te-i-sub-2-sub-si-sub-2-sub-compounds-i-te-i-cr-co-ni-rh-pd-pt
#15
Adam P Pikul, Malgorzata Samsel-Czekala, Grzegorz Chajewski, Tetiana Romanova, Alicja Hackemer, Roman Gorzelniak, Piotr Wiśniewski, Dariusz Kaczorowski
Motivated by the recent discovery of exotic superconductivity in YFe<sub>2</sub>Ge<sub>2</sub> we undertook reinvestigation of formation and physical properties of yttrium-based 1:2:2 silicides. Here we report on syntheses and crystal structures of the Y<i>TE</i><sub>2</sub>Si<sub>2</sub> compounds with <i>TE</i> = Cr, Co, Ni, Rh, Pd, and Pt, and their low-temperature physical properties measurements, supplemented by results of fully relativistic FPLO band structure calculations...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28321883/higher-photosynthesis-nutrient-and-energy-use-efficiencies-contribute-to-invasiveness-of-exotic-plants-in-a-nutrient-poor-habitat-in-northeast-china
#16
Ming-Chao Liu, De-Liang Kong, Xiu-Rong Lu, Kai Huang, Shuo Wang, Wei-Bin Wang, Bo Qu, Yu-Long Feng
The roles of photosynthesis-related traits in invasiveness of introduced plant species are still not well elucidated, especially in nutrient-poor habitats. In addition, little effort has been made to determine the physiological causes and consequences of the difference in these traits between invasive and native plants. To address these problems, we compared the differences in 16 leaf functional traits related to light-saturated photosynthetic rate (Pmax ) between 22 invasive and native plants in a nutrient-poor habitat in northeast China...
March 20, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28321591/naked-in-the-old-and-the-new-world-differences-and-analogies-in-descriptions-of-european-and-american-herbae-nudae-in-the-sixteenth-century
#17
Lucie Čermáková, Jana Černá
The sixteenth century could be understand as a period of renaissance of interest in nature and as a period of development of natural history as a discipline. The spreading of the printing press was connected to the preparation of new editions of Classical texts and to the act of correcting and commenting on these texts. This forced scholars to confront texts with living nature and to subject it to more careful investigation. The discovery of America uncovered new horizons and brought new natural products, which were exotic and unknown to Classical tradition...
March 20, 2017: Journal of the History of Biology
https://www.readbyqxmd.com/read/28321362/from-eggs-to-bites-do-ovitrap-data-provide-reliable-estimates-of-aedes-albopictus-biting-females
#18
Mattia Manica, Roberto Rosà, Alessandra Della Torre, Beniamino Caputo
BACKGROUND: Aedes albopictus is an aggressive invasive mosquito species that represents a serious health concern not only in tropical areas, but also in temperate regions due to its role as vector of arboviruses. Estimates of mosquito biting rates are essential to account for vector-human contact in models aimed to predict the risk of arbovirus autochthonous transmission and outbreaks, as well as nuisance thresholds useful for correct planning of mosquito control interventions. Methods targeting daytime and outdoor biting Ae...
2017: PeerJ
https://www.readbyqxmd.com/read/28317278/species-traits-help-predict-small-mammal-responses-to-habitat-homogenization-by-an-invasive-grass
#19
Joseph P Ceradini, Anna D Chalfoun
Invasive plants can negatively affect native species, however, the strength, direction, and shape of responses may vary depending on the type of habitat alteration and the natural history of native species. To prioritize conservation of vulnerable species, it is therefore critical to effectively predict species' responses to invasive plants, which may be facilitated by a framework based on species' traits. We studied the population and community responses of small mammals and changes in habitat heterogeneity across a gradient of cheatgrass (Bromus tectorum) cover, a widespread invasive plant in North America...
March 20, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28317103/outside-the-envelope-rare-events-disrupt-the-relationship-between-climate-factors-and-species-interactions
#20
Katharine L Stuble, Emily Zefferman, Kristina Wolf, Kurt J Vaughn, Truman P Young
The order in which species arrive during community assembly can be an important driver of community composition and function. However, the strength of these priority effects can be variable, in part because of strong site and year effects. To understand how priority effects vary in importance with abiotic conditions, we initiated identical community assembly experiments in which we varied the timing of arrival of native and exotic grass species in each of four years across three grassland sites in northern California...
March 19, 2017: Ecology
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