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Tohid Farajollahpour, Seyed Akbar Jafari
We use ionic Hubbard model to study the effects of strong correlations on a two-dimensional semiconductor. The spectral gap in the limit where on-site interactions are zero is set by the staggered ionic potential, while in the strong interaction limit it is set by the Hubbard U. Combining mean field solutions of the slave spin and slave rotor methods we propose two interesting gapped phases in between: (i) The insulating phase before the Mott phase can be viewed as gapping a non-Fermi liquid state of spinons by the staggered ionic potential...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Romuald Laso-Jadart, Christine Harmant, Hélène Quach, Nora Zidane, Chris Tyler-Smith, Qasim Mehdi, Qasim Ayub, Lluis Quintana-Murci, Etienne Patin
From the eighth century onward, the Indian Ocean was the scene of extensive trade of sub-Saharan African slaves via sea routes controlled by Muslim Arab and Swahili traders. Several populations in present-day Pakistan and India are thought to be the descendants of such slaves, yet their history of admixture and natural selection remains largely undefined. Here, we studied the genome-wide diversity of the African-descent Makranis, who reside on the Arabian Sea coast of Pakistan, as well that of four neighboring Pakistani populations, to investigate the genetic legacy, population dynamics, and tempo of the Indian Ocean slave trade...
November 1, 2017: American Journal of Human Genetics
Sébastien Küry, Geeske M van Woerden, Thomas Besnard, Martina Proietti Onori, Xénia Latypova, Meghan C Towne, Megan T Cho, Trine E Prescott, Melissa A Ploeg, Stephan Sanders, Holly A F Stessman, Aurora Pujol, Ben Distel, Laurie A Robak, Jonathan A Bernstein, Anne-Sophie Denommé-Pichon, Gaëtan Lesca, Elizabeth A Sellars, Jonathan Berg, Wilfrid Carré, Øyvind Løvold Busk, Bregje W M van Bon, Jeff L Waugh, Matthew Deardorff, George E Hoganson, Katherine B Bosanko, Diana S Johnson, Tabib Dabir, Øystein Lunde Holla, Ajoy Sarkar, Kristian Tveten, Julitta de Bellescize, Geir J Braathen, Paulien A Terhal, Dorothy K Grange, Arie van Haeringen, Christina Lam, Ghayda Mirzaa, Jennifer Burton, Elizabeth J Bhoj, Jessica Douglas, Avni B Santani, Addie I Nesbitt, Katherine L Helbig, Marisa V Andrews, Amber Begtrup, Sha Tang, Koen L I van Gassen, Jane Juusola, Kimberly Foss, Gregory M Enns, Ute Moog, Katrin Hinderhofer, Nagarajan Paramasivam, Sharyn Lincoln, Brandon H Kusako, Pierre Lindenbaum, Eric Charpentier, Catherine B Nowak, Elouan Cherot, Thomas Simonet, Claudia A L Ruivenkamp, Sihoun Hahn, Catherine A Brownstein, Fan Xia, Sébastien Schmitt, Wallid Deb, Dominique Bonneau, Mathilde Nizon, Delphine Quinquis, Jamel Chelly, Gabrielle Rudolf, Damien Sanlaville, Philippe Parent, Brigitte Gilbert-Dussardier, Annick Toutain, Vernon R Sutton, Jenny Thies, Lisenka E L M Peart-Vissers, Pierre Boisseau, Marie Vincent, Andreas M Grabrucker, Christèle Dubourg, Wen-Hann Tan, Nienke E Verbeek, Martin Granzow, Gijs W E Santen, Jay Shendure, Bertrand Isidor, Laurent Pasquier, Richard Redon, Yaping Yang, Matthew W State, Tjitske Kleefstra, Benjamin Cogné, Slavé Petrovski, Kyle Retterer, Evan E Eichler, Jill A Rosenfeld, Pankaj B Agrawal, Stéphane Bézieau, Sylvie Odent, Ype Elgersma, Sandra Mercier
Calcium/calmodulin-dependent protein kinase II (CAMK2) is one of the first proteins shown to be essential for normal learning and synaptic plasticity in mice, but its requirement for human brain development has not yet been established. Through a multi-center collaborative study based on a whole-exome sequencing approach, we identified 19 exceedingly rare de novo CAMK2A or CAMK2B variants in 24 unrelated individuals with intellectual disability. Variants were assessed for their effect on CAMK2 function and on neuronal migration...
November 2, 2017: American Journal of Human Genetics
Cesar Fortes-Lima, Antoine Gessain, Andres Ruiz-Linares, Maria-Cátira Bortolini, Florence Migot-Nabias, Gil Bellis, J Víctor Moreno-Mayar, Berta Nelly Restrepo, Winston Rojas, Efren Avendaño-Tamayo, Gabriel Bedoya, Ludovic Orlando, Antonio Salas, Agnar Helgason, M Thomas P Gilbert, Martin Sikora, Hannes Schroeder, Jean-Michel Dugoujon
The transatlantic slave trade was the largest forced migration in world history. However, the origins of the enslaved Africans and their admixture dynamics remain unclear. To investigate the demographic history of African-descendant Marron populations, we generated genome-wide data (4.3 million markers) from 107 individuals from three African-descendant populations in South America, as well as 124 individuals from six west African populations. Throughout the Americas, thousands of enslaved Africans managed to escape captivity and establish lasting communities, such as the Noir Marron...
November 2, 2017: American Journal of Human Genetics
Jian Dai, Anni Liu, Jingliang Liu, Tian Zhang, Yue Zhou, Feifei Yin, Yitang Dai, Yuanan Liu, Kun Xu
The coupled optoelectronic oscillator (COEO) is typically used to generate high frequency spectrally pure microwave signal with serious sidemodes noise. We propose and experimentally demonstrate a simple scheme for supermode suppression with mutual injection locking between the COEO (master oscillator with multi-modes oscillation) and the embedded free-running oscillator (slave oscillator with single-mode oscillation). The master and slave oscillators share the same electrical feedback path, which means that the mutually injection-locked COEO brings no additional hardware complexity...
October 30, 2017: Optics Express
Vanessa Moraes Bezerra, Amanda Cristina de Souza Andrade, Danielle Souto de Medeiros, Waleska Teixeira Caiaffa
Arterial prehypertension is a precursor of arterial hypertension and a risk factor for cardiovascular diseases. Vulnerable populations are more prone to this condition due to difficulties in access to health services. A previous study in quilombola communities (descendants of African slaves) reported a high prevalence of arterial hypertension. The current study aimed to estimate the prevalence of arterial prehypertension in quilombolas and to assess associated factors. This was a cross-sectional population-based study in individuals 18 years and older...
October 26, 2017: Cadernos de Saúde Pública
Linford D Fisher
This paper is an investigation of the treatment of surrenderers in King Philip's War (1675-1676) in New England, particularly with regard to enslavement. Fear of slavery was a tangible, deep concern for most New England natives involved in the war. Threats of enslavement influenced the involvement of native individuals and groups, driving some into deeper "rebellion" and others to surrender. Each colony had differing policies for surrendering natives, but generally the thousands of surrenderers received far worse treatment than they expected, facing execution, overseas enslavement, local limited-term enslavement, and forced relocation...
2017: Ethnohistory: the Bulletin of the Ohio Valley Historic Indian Conference
Tao Wang, Bo Pan, Yili Fu, Shuguo Wang, Yue Ai
In this paper, we designed a 8 degrees of freedom (DOFs) haptic device for applications in minimally invasive surgical robot. The device can provide three translational, three rotational and a grasping motion and force feedback capability. It is composed of three parts, including an arm mechanism, a redundant wrist mechanism and a grasper mechanism. The kinematics and gravity compensation algorithms are also detailed in the paper. In addition, the haptic device and a slave surgical robot for minimally invasive surgery (MIS) developed by our lab are integrated as a master-slave surgical robotic system in this paper...
October 26, 2017: Computer Assisted Surgery (Abingdon, England)
Melody Li, Snezana Maljevic, A Marie Phillips, Slave Petrovski, Michael Hildebrand, Rosemary Burgess, Therese Mount, Federico Zara, Pasquale Striano, Julian Schubert, Holger Thiele, Peter Nürnberg, Michael Wong, Judith L Weisenberg, Liu Lin Thio, Holger Lerche, Ingrid E Scheffer, Samuel F Berkovic, Steven Petrou, Christopher A Reid
Genetic generalized epilepsy (GGE) is a common epilepsy syndrome that encompasses seizure disorders characterized by spike-and-wave discharges (SWDs). Pacemaker hyperpolarization-activated cyclic nucleotide-gated channels (HCN) are considered integral to SWD genesis, making them an ideal gene candidate for GGE. We identified HCN2 missense variants from a large cohort of 585 GGE patients, recruited by the Epilepsy Phenome-Genome Project (EPGP), and performed functional analysis using two-electrode voltage clamp recordings from Xenopus oocytes...
October 24, 2017: Human Mutation
Lingxue Ren, Olatunji Mumini Omisore, Shipeng Han, Lei Wang
Snake robots can be used to assist experts during surgical operations on internal organs via natural orifices. However, real-time control of such robot in Mater Slave (MS) teleoperation is a major challenge. Inverse kinematics solution of snake robots has being a key challenge towards real time control especially if the robot is hyper-redundant. This paper proposes a method that can achieve fast and precise inverse kinematics solution for real time control MS teleoperation. Monte Carlo method is applied to determine possible positions needed to reach a given target point, while best position is chosen based on the optimization algorithm...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Dongzhou Zhong, Geliang Xu, Wei Luo, Zhenzhen Xiao
According to the principle of complete chaos synchronization and the theory of Hilbert phase transformation, we propose a novel real-time multi-target ranging scheme by using chaotic polarization laser radar in the drive-response vertical-cavity surface-emitting lasers (VCSELs). In the scheme, to ensure each polarization component (PC) of the master VCSEL (MVCSEL) to be synchronized steadily with that of the slave VCSEL, the output x-PC and y-PC from the MVCSEL in the drive system and those in the response system are modulated by the linear electro-optic effect simultaneously...
September 4, 2017: Optics Express
José Carlos Barreiro
This article analyzes the English botanist George Gardner's trip to Brazil during the 1830s. After graduating from the University of Glasgow Gardner was influenced by his teacher and by readings of contemporary naturalists and set off for Brazil in March of 1836, arriving two months later in Rio de Janeiro. The article presents Gardner's impressions of slavery in Brazil, in an attempt to unveil the symbolic universe of a play he witnessed and described, which took place on a farm in Rio de Janeiro on Christmas night...
July 2017: História, Ciências, Saúde—Manguinhos
Jacopo Buzzi, Giancarlo Ferrigno, Joost M Jansma, Elena De Momi
Teleoperated robotic systems are widely spreading in multiple different fields, from hazardous environments exploration to surgery. In teleoperation, users directly manipulate a master device to achieve task execution at the slave robot side; this interaction is fundamental to guarantee both system stability and task execution performance. In this work, we propose a non-disruptive method to study the arm endpoint stiffness. We evaluate how users exploit the kinetic redundancy of the arm to achieve stability and precision during the execution of different tasks with different master devices...
2017: Frontiers in Neuroscience
Jeroen Van Oosterhout, Cock J M Heemskerk, Marco R de Baar, Frans C T van der Helm, David A Abbink
Certain tele-manipulation tasks require manipulation by two asymmetric slaves, for example a crane for hoisting and a dexterous robotic arm for fine manipulation. It is unclear how to best design human-in-the-loop control over two asymmetric slaves. The goal of this paper is to quantitatively compare the standard approach of two co-operating operators that each control a single subtask, to a single operator performing bimanual control over the two subtasks, and a uni-manual control approach.
October 4, 2017: IEEE Transactions on Haptics
Ok Sun Kim, Sohyune R Sok
OBJECTIVE: To understand the life experiences of elderly people who are living in long-term care hospitals and are afflicted with suicide ideation. METHODS: A phenomenological qualitative methodology based on Colaizzi's method was used for the study. Participants included 9 elderly people who are 65 years old or older with suicidal ideas and were admitted in any of the 3 long-term care hospitals in D City, Gyeonggi-do, South Korea. Data were collected from July to December 2014...
October 5, 2017: International Journal of Nursing Practice
Nianqiang Li, H Susanto, B Cemlyn, I D Henning, M J Adams
We report on a master and slave configuration consisting of two optically pumped spin-vertical-cavity surface-emitting lasers for chaos synchronization and secure communication. Under appropriate conditions, high-quality chaos synchronization is achieved. We propose two encryption schemes, where either the pump magnitude or polarization is modulated. The results show that these allow for Gb/s transmission of secure data, but exhibit different features: one indicates that the message can be recovered by the total intensity, but not the polarization components, whereas the other shows that the message can be better or exclusively retrieved from the polarization components at high bit rates...
September 1, 2017: Optics Letters
Anya Revah-Politi, Mythily Ganapathi, Louise Bier, Megan T Cho, David B Goldstein, Parisa Hemati, Alejandro Iglesias, Jane Juusola, John Pappas, Slavé Petrovski, Ashley L Wilson, Vimla S Aggarwal, Kwame Anyane-Yeboa
The association between 1p32-p31 contiguous gene deletions and a distinct phenotype that includes anomalies of the corpus callosum, ventriculomegaly, developmental delay, seizures, and dysmorphic features has been long recognized and described. Recently, the observation of overlapping phenotypes in patients with chromosome translocations that disrupt NFIA (Nuclear factor I/A), a gene within this deleted region, and NFIA intragenic deletions has led to the hypothesis that NFIA is a critical gene within this region...
December 2017: American Journal of Medical Genetics. Part A
Jaehyun Shin, Yongmin Zhong, Chengfan Gu
Bilateral control of a master-slave robotic system is a challenging issue in robotic-assisted minimally invasive surgery. It requires the knowledge on contact interaction between a surgical (slave) robot and soft tissues. This paper presents a master-slave robotic system for needle indentation and insertion. This master-slave robotic system is able to characterize the contact interaction between the robotic needle and soft tissues. A bilateral controller is implemented using a linear motor for robotic needle indentation and insertion...
September 22, 2017: Computer Assisted Surgery (Abingdon, England)
Andrés Julián Gutiérrez-Escobar, Esperanza Trujillo, Orlando Acevedo, María Mercedes Bravo
BACKGROUND: During the Spanish colonisation of South America, African slaves and Europeans arrived in the continent with their corresponding load of pathogens, including Helicobacter pylori. Colombian strains have been clustered with the hpEurope population and with the hspWestAfrica subpopulation in multilocus sequence typing (MLST) studies. However, ancestry studies have revealed the presence of population components specific to H. pylori in Colombia. The aim of this study was to perform a thorough phylogenomic analysis to describe the evolution of the Colombian urban H...
2017: Gut Pathogens
Areej Bukhari, Javier Rodriguez Luis, Miguel A Alfonso-Sanchez, Ralph Garcia-Bertrand, Rene J Herrera
Notwithstanding the general interest and the geopolitical importance of the island countries in the Greater Antilles, little is known about the specific ancestral Native American and African populations that settled them. In an effort to alleviate this lacuna of information on the genetic constituents of the Greater Antilles, we comprehensively compared the mtDNA compositions of Cuba, Dominican Republic, Haiti, Jamaica and Puerto Rico. To accomplish this, the mtDNA HVRI and HVRII regions, as well as coding diagnostic sites, were assessed in the Haitian general population and compared to data from reference populations...
December 30, 2017: Gene
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