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https://www.readbyqxmd.com/read/28225002/topologically-protected-localised-states-in-spin-chains
#1
Marta P Estarellas, Irene D'Amico, Timothy P Spiller
We consider spin chain families inspired by the Su, Schrieffer and Hegger (SSH) model. We demonstrate explicitly the topologically induced spatial localisation of quantum states in our systems. We present detailed investigations of the effects of random noise, showing that these topologically protected states are very robust against this type of perturbation. Systems with such topological robustness are clearly good candidates for quantum information tasks and we discuss some potential applications. Thus, we present interesting spin chain models which show promising applications for quantum devices...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28219759/reevaluating-species-number-distribution-and-endemism-of-the-coral-genus-pocillopora-lamarck-1816-using-species-delimitation-methods-and-microsatellites
#2
P Gélin, B Postaire, C Fauvelot, H Magalon
Species delimitation methods based on genetic information, notably using single locus data, have been proposed as means of increasing the rate of biodiversity description, but can also be used to clarify complex taxonomies. In this study, we explore the species diversity within the cnidarian genus Pocillopora, widely distributed in the tropical belt of the Indo-Pacific Ocean. From 943 Pocillopora colonies sampled in the Western Indian Ocean, the Tropical Southwestern Pacific and Southeast Polynesia, representing a huge variety of morphotypes, we delineated Primary Species Hypotheses (PSH) applying the Automatic Barcode Gap Discovery method, the Poisson tree processes algorithm and the Generalized mixed Yule-coalescent model on two mitochondrial markers (Open Reading Frame and Dloop) and reconstructing a haploweb using one nuclear marker (Internal Transcribed Spacer 2)...
February 17, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28219010/dynamics-of-polarons-in-organic-conjugated-polymers-with-side-radicals
#3
Junjuan Liu, Zengjiang Wei, Yalin Zhang, Yan Meng, Bing Di
Based on the one-dimensional tight-binding Su-Schrieffer-Heeger (SSH) model, and us- ing the molecular dynamics method, we discuss the dynamics of electron and hole polarons propagating along a polymer chain, as a function of the distance between side radicals and the magnitude of the transfer integrals between the main chain and the side radicals. We first dis- cuss the average velocities of electron and hole polarons as a function of the distance between side radicals. It is found that the average velocities of the electron polarons remain almost un- changed, while the average velocities of hole polarons decrease significantly when the radical distance is comparable to the polaron width...
February 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28199921/pilot-scale-bioconversion-of-rice-and-sunflower-agro-residues-into-medicinal-mushrooms-and-laccase-enzymes-through-solid-state-fermentation-with-ganoderma-lucidum
#4
P D Postemsky, M A Bidegain, R González-Matute, N D Figlas, M A Cubitto
Solid-state fermentation was evaluated at the pilot-scale for the bioconversion and valorization of rice husks and straw (RSH), or sunflower seed hulls (SSH), into medicinal mushrooms and crude extracts, with laccase activity. The average mushroom yield was 56kg dry weight per ton of agro-residues. Laccase activity in crude aqueous extracts showed its maximum value of 10,927Ukg(-1) in RSH (day 10, Exudate phase) and 16,442Ukg(-1) in SSH (day 5, Full colonization phase), the activity at the Residual substrate phase being 511Ukg(-1) in RSH and 803Ukg(-1) in SSH, respectively...
May 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28188424/fine-tuning-of-the-flavonoid-and-monolignol-pathways-during-apple-early-fruit-development
#5
Paolo Baldi, Mirko Moser, Matteo Brilli, Urska Vrhovsek, Massimo Pindo, Azeddine Si-Ammour
A coordinated regulation of different branches of the flavonoid pathway was highlighted that may contribute to elucidate the role of this important class of compounds during the early stages of apple fruit development. Apple (Malus × domestica Borkh.) is an economically important fruit appreciated for its organoleptic characteristics and its benefits for human health. The first stages after fruit set represent a very important and still poorly characterized developmental process. To enable the profiling of genes involved in apple early fruit development, we combined the suppression subtractive hybridization (SSH) protocol to next-generation sequencing...
February 11, 2017: Planta
https://www.readbyqxmd.com/read/28168535/polaron-and-bipolaron-stability-on-paraphenylene-polymers
#6
Maurício Bellissimo Falleiros, Geraldo Magela E Silva
Polyparaphenylene is the prototypical conjugated polymer containing phenyl rings and its properties are good references for a family of derived polymers. We investigate the structure, stability, and dynamics of polarons and bipolarons in polyparaphenylene chains under an applied electric field. To do this, we use a bidimensional SSH Hamiltonian model with the Hubbard extension, i.e., with local and nearest-neighbor Coulomb interaction, which has been designed to work with general hexagonal lattices, from which polyparaphenylene can be seen as a prominent case...
February 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28154979/electron-phonon-coupling-effects-on-intrachain-polaron-recombination-in-conjugated-polymers
#7
Fábio Ferreira Monteiro, Luiz Antonio Ribeiro Junior, Antonio Luciano de Almeida Fonseca, Geraldo Magela E Silva, Wiliam Ferreira da Cunha
Based on a one-dimensional Su-Schrieffer-Heeger (SSH) model with electron correlation considered within the extended Hubbard model (EHM), we investigate the role played by electron-phonon coupling constant on intrachain polaron recombination in conjugated polymers. Our results suggest that a competition between external electric field and electron-phonon coupling on defining the behavior of the charge distribution of the system takes place. Whereas increasing electric field plays the role of destabilizing the charge carriers, an increase of the electron-phonon coupling has the opposite effect...
February 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28118311/acute-effects-of-static-stretching-of-hamstring-on-performance-and-acl-injury-risk-during-stop-jump-and-cutting-tasks-in-female-athletes
#8
Mianfang Ruan, Qiang Zhang, Xie Wu
There is limited research investigating antagonist stretch. The purpose of this study was to evaluate the influence of SSH on performance and ACL injury risk during stop-jump and 180° cutting tasks. Twelve female college athletes (age 20.8 ± 0.7 years; height 1.61 ± 0.05 m; mass 54.25 ± 4.22 kg) participated in this study. Subjects performed stop-jump and 180° cutting tasks under two conditions: after warm-up with 4×30 s SSH or after warm-up without SSH. Three-dimensional kinematic and kinetic data as well as EMG of biceps femoris (BF), rectus femoris (RF), vastus medialis (VM), and gastrocnemius medialis (GM) were collected during testing...
January 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28053575/faba-bean-drought-responsive-gene-identification-and-validation
#9
Megahed H Ammar, Altaf M Khan, Hussein M Migdadi, Samah M Abdelkhalek, Salem S Alghamdi
This study was carried out to identify drought-responsive genes in a drought tolerant faba bean variety (Hassawi 2) using a suppressive subtraction hybridization approach (SSH). A total of 913 differentially expressed clones were sequenced from a differential cDNA library that resulted in a total of 225 differentially expressed ESTs. The genes of mitochondrial and chloroplast origin were removed, and the remaining 137 EST sequences were submitted to the gene bank EST database (LIBEST_028448). A sequence analysis identified 35 potentially drought stress-related ESTs that regulate ion channels, kinases, and energy production and utilization and transcription factors...
January 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28008924/observation-of-the-topological-soliton-state-in-the-su-schrieffer-heeger-model
#10
Eric J Meier, Fangzhao Alex An, Bryce Gadway
The Su-Schrieffer-Heeger (SSH) model, which captures the most striking transport properties of the conductive organic polymer trans-polyacetylene, provides perhaps the most basic model system supporting topological excitations. The alternating bond pattern of polyacetylene chains is captured by the bipartite sublattice structure of the SSH model, emblematic of one-dimensional chiral symmetric topological insulators. This structure supports two distinct nontrivial topological phases, which, when interfaced with one another or with a topologically trivial phase, give rise to topologically protected, dispersionless boundary states...
December 23, 2016: Nature Communications
https://www.readbyqxmd.com/read/27964922/transcriptomic-information-from-pacific-white-shrimp-litopenaeus-vannamei-ovary-and-eyestalk-and-expression-patterns-for-genes-putatively-involved-in-the-reproductive-process
#11
Claudia Ventura-López, Pavel E Galindo-Torres, Fabiola G Arcos, Clara Galindo-Sánchez, Ilie S Racotta, Cristina Escobedo-Fregoso, Raúl Llera-Herrera, Ana M Ibarra
The increased use of massive sequencing technologies has enabled the identification of several genes known to be involved in different mechanisms associated with reproduction that so far have only been studied in vertebrates and other model invertebrate species. In order to further investigate the genes involved in Litopenaeus vannamei reproduction, cDNA and SSH libraries derived from female eyestalk and gonad were produced, allowing the identification of expressed sequences tags (ESTs) that potentially have a role in the regulation of gonadal maturation...
December 10, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27930533/association-of-vagus-nerve-severance-and-decreased-risk-of-subsequent-type-2-diabetes-in-peptic-ulcer-patients-an-asian-population-cohort-study
#12
Shih-Chi Wu, William Tzu-Liang Chen, Chu-Wen Fang, Chih-Hsin Muo, Fung-Chang Sung, Chung Y Hsu
Vagus nerve may play a role in serum glucose modulation. The complicated peptic ulcer patients (with perforation or/and bleeding) who received surgical procedures with or without vagotomy provided 2 patient populations for studying the impact of vagus nerve integrity. We assessed the risk of developing type 2 diabetes in peptic ulcer patients without and with complications by surgical treatment received in a retrospective population study using the National Health Insurance database in Taiwan.A cohort of 163,385 patients with peptic ulcer and without Helicobacter pylori infection in 2000 to 2003 was established...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27929131/silencing-of-the-slnap7-gene-influences-plastid-development-and-lycopene-accumulation-in-tomato
#13
Da-Qi Fu, Lan-Huan Meng, Ben-Zhong Zhu, Hong-Liang Zhu, Hua-Xue Yan, Yun-Bo Luo
Ripening is an important stage of fruit development. To screen the genes associated with pigment formation in tomato fruit, a suppression subtractive hybridization (SSH) cDNA library was constructed by using tomato fruit in the green ripe and break ripe stages, and 129 differential genes were obtained. Using redness as a screening marker, virus-induced gene silencing (VIGS) of the differential genes was performed with a sprout vacuum-infiltration system (SVI). The results showed that silencing the SlNAP7 gene affected the chloroplast development of tomato leaves, manifesting as a photo-bleaching phenotype, and silenced fruit significantly affected the accumulation of lycopene, manifested as a yellow phenotype...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896424/dynamic-expression-analysis-of-early-response-genes-induced-by-potato-virus-y-in-pvy-resistant-nicotiana-tabacum
#14
Shuai Chen, Fengxia Li, Dan Liu, Caihong Jiang, Lijie Cui, Lili Shen, Guanshan Liu, Aiguo Yang
Dynamic transcriptional changes of the host early responses genes were detected in PVY-resistant tobacco varieties infected with Potato virus Y; PVY resistance is a complex process that needs series of stress responses. Potato virus Y (PVY) causes a severe viral disease in cultivated crops, especially in Solanum plants. To understand the molecular basis of plant responses to the PVY stress, suppression subtractive hybridization (SSH) and microarray approaches were combined to identify the potentially important or novel genes that were involved in early stages (12 h, 1, 2, 3, 5, 8 days) of tobacco response to PVY infection...
November 28, 2016: Plant Cell Reports
https://www.readbyqxmd.com/read/27886491/interplay-of-site-and-bond-electron-phonon-coupling-in-one-dimension
#15
Martin Hohenadler
The interplay of bond and charge correlations is studied in a one-dimensional model with both Holstein and Su-Schrieffer-Heeger (SSH) couplings to quantum phonons. The problem is solved exactly by quantum Monte Carlo simulations. If one of the couplings dominates, the ground state is a Peierls insulator with long-range bond or charge order. At weak coupling, the results suggest a spin-gapped and repulsive metallic phase arising from the competing order parameters and lattice fluctuations. Such a phase is absent from the pure SSH model even for quantum phonons...
November 11, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27872628/proteomics-and-ssh-analyses-of-ala-promoted-fruit-coloration-and-evidence-for-the-involvement-of-a-mads-box-gene-mdmads1
#16
Xinxin Feng, Yuyan An, Jie Zheng, Miao Sun, Liangju Wang
Skin color is a key quality attribute of fruits and how to improve fruit coloration has long been a major concern. 5-Aminolevulinic acid (ALA), a natural plant growth regulator, can significantly increase anthocyanin accumulation in fruit skin and therefore effectively improve coloration of many fruits, including apple. However, the molecular mechanism how ALA stimulates anthocyanin accumulation in fruit skin remains unknown. Here, we investigated the impact of ALA on apple skin at the protein and mRNA levels...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27862175/epistemology-culture-justice-and-power-non-bioscientific-knowledge-for-medical-training
#17
Ayelet Kuper, Paula Veinot, Jennifer Leavitt, Sarah Levitt, Amanda Li, Jeannette Goguen, Martin Schreiber, Lisa Richardson, Cynthia R Whitehead
CONTEXT: While medical curricula were traditionally almost entirely comprised of bioscientific knowledge, widely accepted competency frameworks now make clear that physicians must be competent in far more than biomedical knowledge and technical skills. For example, of the influential CanMEDS roles, six are conceptually based in the social sciences and humanities (SSH). Educators frequently express uncertainty about what to teach in this area. This study concretely identifies the knowledge beyond bioscience needed to support the training of physicians competent in the six non-Medical Expert CanMEDS roles...
February 2017: Medical Education
https://www.readbyqxmd.com/read/27849566/effects-of-sacubitril-valsartan-lcz696-on-natriuresis-diuresis-blood-pressures-and-nt-probnp-in-salt-sensitive-hypertension
#18
Tzung-Dau Wang, Ru-San Tan, Hae-Young Lee, Sang-Hyun Ihm, Moo-Yong Rhee, Brian Tomlinson, Parasar Pal, Fan Yang, Elizabeth Hirschhorn, Margaret F Prescott, Markus Hinder, Thomas H Langenickel
: Salt-sensitive hypertension (SSH) is characterized by impaired sodium excretion and subnormal vasodilatory response to salt loading. Sacubitril/valsartan (LCZ696) was hypothesized to increase natriuresis and diuresis and result in superior blood pressure control compared with valsartan in Asian patients with SSH. In this randomized, double-blind, crossover study, 72 patients with SSH received sacubitril/valsartan 400 mg and valsartan 320 mg once daily for 4 weeks each. SSH was diagnosed if the mean arterial pressure increased by ≥10% when patients switched from low (50 mmol/d) to high (320 mmol/d) sodium diet...
January 2017: Hypertension
https://www.readbyqxmd.com/read/27813556/overexpression-of-a-glycine-rich-protein-gene-in-lablab-purpureus-improves-abiotic-stress-tolerance
#19
L M Yao, Y N Jiang, X X Lu, B Wang, P Zhou, T L Wu
Glycine-rich protein (GRP) is involved in the response to abiotic and biotic stresses in plants. A novel GRP gene in Lablab purpureus has been identified. The cDNA of LpGRP was obtained from an SSH library constructed with root tissues of L. purpureus MEIDOU 2012 by waterholding for 10 days. The function of LpGRP was also evaluated in Arabidopsis. The cDNA of LpGRP has 555 bp and encodes a 184-amino acid protein. LpGRP was induced by drought and improved tolerance to abiotic stress. In LpGRP overexpressing Arabidopsis, the tolerance of transgenic seedlings to drought and salt was improved, and transgenic seeds showed insensitivity to both ABA and NaCl...
October 24, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27786294/molecular-cloning-and-expression-of-an-encoding-galactinol-synthase-gene-angols1-in-seedling-of-ammopiptanthus-nanus
#20
YuDong Liu, Li Zhang, LiJing Chen, Hui Ma, YanYe Ruan, Tao Xu, ChuanQiang Xu, Yi He, MingFang Qi
Based on the galactinol synthase (AnGolS1) fragment sequence from a cold-induced Suppression Subtractive Hybridization (SSH) library derived from Ammopiptanthus nanus (A. nanus) seedlings, AnGolS1 mRNA (including the 5' UTR and 3' UTR) (GenBank accession number: GU942748) was isolated and characterized by rapid amplification of cDNA ends polymerase chain reaction (RACE-PCR). A substrate reaction test revealed that AnGolS1 possessed galactinol synthase activity in vitro and could potentially be an early-responsive gene...
October 27, 2016: Scientific Reports
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