Anomalous Defects and Their Quantized Transverse Conductivities

Using a description of defects in solids in terms of three-dimensional gravity, we study the propagation of electrons in the background of disclinations and screw dislocations. We study the situations where there are bound states that are effectively localized on the defect and hence can be described in terms of an effective 1+1 dimensional field theory for the low energy excitations. In the case of screw dislocations, we find that these excitations are chiral and can be described by an effective field theory of chiral fermions. Fermions of both chirality occur even for a given direction of the magnetic field. The ``net'' chirality of the system however is not always the same for a given direction of the magnetic field, but changes from one sign of the chirality through zero to the other sign as the Fermi momentum or the magnitude of the magnetic flux is varied. On coupling to an external electromagnetic field, the latter becomes anomalous, and predicts novel conduction properties for these materials.Comment: New material added. ReVTeX , 31 pgs., 4 figs.(uses epsf

Selective patterning of gold surfaces by core/shell, semisoft hybrid nanoparticles

The generation of patterned surfaces with well-defined nano- and microdomains is demonstrated by attaching core/shell, semisoft nanoparticles with narrow size distribution to microdomains of a gold-coated silicon wafer. Near monodisperse nanoparticles are prepared using reversible addition-fragmentation chain transfer (RAFT) polymerization, initiated from a silica surface, to prepare a polystyrene shell around a silica core. The particles are then used as-prepared, or after aminolysis of the terminal thiocarbonyl group of the polystyrene shell, to give thiol-terminated nanoparticles. When gold-coated silicon wafers are immersed into very dilute suspensions of these particles (as low as 0.004 wt%), both types of particles are shown to adhere to the gold domains. The thiolated particles adhere selectively to the gold microdomains, allowing for microdomain patterning, while particles that contain the trithiocarbonate functionality lead to a much more even coverage of the gold surface with fewer particle aggregations

Primulaceae

https://nsuworks.nova.edu/occ_facbooks/1095/thumbnail.jp

Measuring subhalo mass in redMaPPer clusters with CFHT Stripe 82 Survey

We use the shear catalog from the CFHT Stripe-82 Survey to measure the subhalo masses of satellite galaxies in redMaPPer clusters. Assuming a Chabrier Initial Mass Function (IMF) and a truncated NFW model for the subhalo mass distribution, we find that the sub-halo mass to galaxy stellar mass ratio increases as a function of projected halo-centric radius $r_p$, from $M_{\rm sub}/M_{\rm star}=4.43^{+ 6.63}_{- 2.23}$ at $r_p \in [0.1,0.3]$ $h^{-1}Mpc$ to $M_{\rm sub}/M_{\rm star}=75.40^{+ 19.73}_{- 19.09}$ at $r_p \in [0.6,0.9]$ $h^{-1}Mpc$. We also investigate the dependence of subhalo masses on stellar mass by splitting satellite galaxies into two stellar mass bins: $10<\log(M_{\rm star}/M_{\rm sun})<10.5$ and $11<\log(M_{\rm star}/M_{\rm sun})<12$. The best-fit subhalo mass of the more massive satellite galaxy bin is larger than that of the less massive satellites: $\log(M_{\rm sub}/M_{\rm sun})=11.14 ^{+ 0.66 }_{- 0.73}$ ($M_{\rm sub}/M_{\rm star}=19.5^{+19.8}_{-17.9}$) versus $\log(M_{\rm sub}/M_{\rm sun})=12.38 ^{+ 0.16 }_{- 0.16}$ ($M_{\rm sub}/M_{\rm star}=21.1^{+7.4}_{-7.7}$).Comment: 10 pages, 8 figures, accepted by MNRA

Sismologia de mundos em performance

This article presents the dossier “Worlds in Performance”, an outcome of the event “Seismology of Performance: 20 years Napedra”, which took place in 2021. Attention is directed to the “performative turn” and its seismic effects on anthropology and other fields of research. Horizons of knowledge expand, subverting notions of space, and imploding conceptions of time. The fragile and ephemeral, yet potentially powerful and explosive dimensions of bodily action spark the anthropological imagination. From bodily senses worlds of sense in friction are created. In performance, worlds are formed and disappear. Whirlpools of performance show traces of worlds yet to be. In Brazil, effects of this “performative turn” are revealed in the creation of Napedra – The Research Center in Anthropology, Performance, and Drama, and of other leading groups in anthropology and performance. They are also revealed in this dossier, which explores some of the whirlpools of worlds in performance.Este texto apresenta o dossiê “Mundos em Performance”, um dos desdobramentos do evento “Sismologia da performance: Napedra 20 anos”, realizado em 2021. Em foco, a “virada performativa” e seus efeitos sísmicos na antropologia e outros campos do saber. Horizontes se ampliam, subvertendo noções de campo e espaço e implodindo concepções de tempo. As atenções se voltam à ação surpreendente, frágil e efêmera, mas potencialmente poderosa e explosiva dos corpos. Dos sentidos dos corpos, criam-se e se friccionam os sentidos de mundos. Em performance, mundos se formam e desaparecem. Em remoinhos, encontram-se os que ainda não vieram a ser, mas que podem surgir. No Brasil, os efeitos de uma “virada performativa” se revelam na criação do Núcleo de Antropologia, Performance e Drama (Napedra), de outros grupos de referência no campo da antropologia e performance e neste dossiê, que procura explorar alguns dos remoinhos de mundos em performance

Effect of the isolation of Sterculia apetala trees on the emergence of seedlings in Pantanal

Árvores de Sterculia apetala não são derrubadas durante a conversão de florestas em pastagens devido à consciência dos proprietários rurais de que essas árvores abrigam 95% dos ninhos de arara-azul no Pantanal. Nosso objetivo foi comparar a porcentagem de emergência de plântulas em casa de vegetação de sementes de árvores em floresta conservada daquelas mantidas isoladas em pastagens cultivadas. As sementes foram coletadas diretamente sobre o solo, sob 10 árvores de S. apetala em cada área, no Pantanal, em Corumbá, Mato Grosso do Sul, Brasil. A emergência de plântulas de árvores isoladas foi 14% inferior ao obtido para árvores do interior da floresta. É necessário que estudos futuros sobre a ecologia dessa espécie no Pantanal enfoquem o sistema reprodutivo, a identificação do agente polinizador e a avaliação do efeito do isolamento sobre a viabilidade populacional da espécie, a qual pode impactar o sucesso reprodutivo da arara-azul. _________________________________________________________________________________ ABSTRACTEffect of the isolation of Sterculia apetala trees on the emergence of seedlings in Pantanal. Sterculia apetala trees aren’t removed during the conversion of forests into pastures due to rural landowners’ awareness that these trees are home to 95% of the nests of Hyacinth Macaw in Pantanal. Our aim was to compare the greenhouse emergence rate of seedlings from seeds of trees at conserved forest and those left isolated in a cultivated pastures. The seeds were collected directly from the ground, under 10 S. apetala trees in each area, at the Pantanal Wetland, Corumba, Mato Grosso do Sul, Brazil. The emergence of seedlings from isolated trees was 14% lower than that obtained from trees located in the inner part of the forest. There’s a need for further studies on the ecology of this species in Pantanal focused on the mating system, the identification of the pollination agent and the evaluation of the effects of isolation on the viability of species population, which may impact the Hyacinth Macaw reproduction success

Attractiveness of host plant volatile extracts to the Asian citrus psyllid, diaphorina citri, is reduced by terpenoids from the non-host cashew

Diaphorina citri is a vector of the bacterial causative agent of Huanglongbing (HLB = Citrus greening), a severe disease affecting citrus crops. As there is no known control for HLB, manipulating insect behaviour through deployment of semiochemicals offers a promising opportunity for protecting citrus crops. The behavioural responses of D. citri to plant volatiles, and the identity of these plant volatiles were investigated. Volatiles were collected from host plants Murraya paniculata, Citrus sinensis, C. reshni, C. limettioides, Poncirus trifoliata, and from non-host plants Psidium guajava, Mangifera indica, Anacardium occidentale. In behavioural assays, female D. citri spent more time in the arms containing volatiles from either M. paniculata or C. sinensis compared to the control arms. When D. citri was exposed to volatiles collected from A. occidentale, they preferred the control arm. Volatiles emitted from the other studied plants did not influence the foraging behaviour of D. citri. Chemical analyses of volatile extracts from C. sinensis, M. paniculata, and A. occidentale revealed the presence of the terpenoids (E)-4,8-dimethylnona-1,3,7–triene (DMNT) and (E,E)-4,8,12-trimethyltrideca-1,3,7,11-tetraene (TMTT) in higher amounts in A. occidentale. In further behavioural bioassays, female D. citri spent less time in arms containing a synthetic blend of DMNT and TMTT compared to the control arms. Female D. citri also spent less time in arms containing the synthetic blend in combination with volatile extracts from either M. paniculata or C. sinensis compared to the control arms. Results suggest that higher release of the two terpenoids by A. occidentale make this species unattractive to D. citri, and that the terpenoids could be used in reducing colonisation of citrus plants and therefore HLB infection

Prospectus, October 11, 2000

https://spark.parkland.edu/prospectus_2000/1026/thumbnail.jp

Influence of two acyclic homoterpenes (Tetranorterpenes) on the foraging behavior of anthonomus grandis Boh

Previous studies have shown that the boll weevil, Anthonomus grandis, is attracted to constitutive and conspecific herbivore-induced cotton volatiles, preferring the blend emitted by cotton at the reproductive over the vegetative stage. Moreover, this preference was paralleled by the release of the acyclic homoterpenes (tetranorterpenes) (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) and (E,E)-4,8,12-trimethyltrideca-1,3,7,11-tetraene (TMTT) in Delta Opal cotton being higher at the vegetative than at the reproductive stage. Here, we evaluated whether this difference in release of acyclic homoterpenes also occurred in other cotton varieties, and if boll weevils could recognize these compounds as indicators of a specific cotton phenological stage. Results showed that cotton genotypes CNPA TB-90, BRS-293 and Delta Opal all produced higher levels of DMNT and TMTT at the vegetative stage than at the reproductive stage and that these homoterpenes allowed for principal component analysis separation of volatiles produced by the two phenological stages. Electroantennograms confirmed boll weevil antennal responses to DMNT and TMTT. Behavioral assays, using Y-tube olfactometers, showed that adding synthetic homoterpenes to reproductive cotton volatiles (mimicking cotton at the vegetative stage in terms of homoterpene levels) resulted in reduced attraction to boll weevils compared to that to unmodified reproductive cotton. Weevils showed no preference when given a choice between plants at the vegetative stage and the vegetative stage-mimicked plant. Altogether, the results show that DMNT and TMTT are used by boll weevils to distinguish between cotton phenological stages

Prospectus, June 19, 2001

https://spark.parkland.edu/prospectus_2001/1017/thumbnail.jp