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Emergence complexity theory

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https://www.readbyqxmd.com/read/28340346/the-upsides-and-downsides-of-organelle-interconnectivity
#1
REVIEW
Daniel E Gottschling, Thomas Nyström
Interconnectivity and feedback control are hallmarks of biological systems. This includes communication between organelles, which allows them to function and adapt to changing cellular environments. While the specific mechanisms for all communications remain opaque, unraveling the wiring of organelle networks is critical to understand how biological systems are built and why they might collapse, as occurs in aging. A comprehensive understanding of all the routes involved in inter-organelle communication is still lacking, but important themes are beginning to emerge, primarily in budding yeast...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28326538/integrating-lipid-storage-into-general-representations-of-fish-energetics
#2
Benjamin T Martin, Ron Heintz, Eric M Danner, Roger M Nisbet
1.Fish, even of the same species, can exhibit substantial variation in energy density (energy per unit wet weight). Most of this variation is due to differences in the amount of storage lipids. In addition to their importance as energy reserves for reproduction and for survival during unfavorable conditions, the accumulation of lipids represents a large energetic flux for many species, so figuring out how this energy flux is integrated with other major energy fluxes (growth, reproduction) is critical for any general theory of organismal energetics...
March 22, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28316578/attractor-states-in-teaching-and-learning-processes-a-study-of-out-of-school-science-education
#3
Carla H Geveke, Henderien W Steenbeek, Jeannette M Doornenbal, Paul L C Van Geert
In order for out-of-school science activities that take place during school hours but outside the school context to be successful, instructors must have sufficient pedagogical content knowledge (PCK) to guarantee high-quality teaching and learning. We argue that PCK is a quality of the instructor-pupil system that is constructed in real-time interaction. When PCK is evident in real-time interaction, we define it as Expressed Pedagogical Content Knowledge (EPCK). The aim of this study is to empirically explore whether EPCK shows a systematic pattern of variation, and if so whether the pattern occurs in recurrent and temporary stable attractor states as predicted in the complex dynamic systems theory...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28297917/free-energy-of-singular-sticky-sphere-clusters
#4
Yoav Kallus, Miranda Holmes-Cerfon
Networks of particles connected by springs model many condensed-matter systems, from colloids interacting with a short-range potential and complex fluids near jamming, to self-assembled lattices and various metamaterials. Under small thermal fluctuations the vibrational entropy of a ground state is given by the harmonic approximation if it has no zero-frequency vibrational modes, yet such singular modes are at the epicenter of many interesting behaviors in the systems above. We consider a system of N spherical particles, and directly account for the singularities that arise in the sticky limit where the pairwise interaction is strong and short ranged...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28296290/game-xp-action-games-as-experimental-paradigms-for-cognitive-science
#5
Wayne D Gray
Why games? How could anyone consider action games an experimental paradigm for Cognitive Science? In 1973, as one of three strategies he proposed for advancing Cognitive Science, Allen Newell exhorted us to "accept a single complex task and do all of it." More specifically, he told us that rather than taking an "experimental psychology as usual approach," we should "focus on a series of experimental and theoretical studies around a single complex task" so as to demonstrate that our theories of human cognition were powerful enough to explain "a genuine slab of human behavior" with the studies fitting into a detailed theoretical picture...
March 13, 2017: Topics in Cognitive Science
https://www.readbyqxmd.com/read/28282073/-reflections-of-a-geneticist-on-the-influence-of-genes-in-psychiatric-disorders
#6
Víctor B Penchaszadeh
The nature and causes of psychiatric disorders are controversial and subject to debate, with theories changing according to historical, scientific, political, social and cultural contexts. In the past, hereditarian hypotheses stumbled in front of the lack of knowledge of genetics, the complexity of genetic-environmental interactions and the controversies of phenotypic definitions, still unresolved. The burst of genomics gave hopes to those who believe that the causes of psychiatric disorders is in the genes and who, armed with DNA sequencers and bioinformatics, began comparing genomic sequences among patients and controls, looking for associations with diverse phenotypes which remain inadequately defined...
September 2016: Vertex: Revista Argentina de Psiquiatriá
https://www.readbyqxmd.com/read/28280990/parenting-strategies-in-modern-and-emerging-economies-introduction-to-the-special-issue
#7
Kermyt G Anderson, Kathrine E Starkweather
Independent of ecology, subsistence strategy, social complexity, or other aspects of socioecology, the altricial nature of young humans requires mothers to have help raising their offspring. What seems to be context-dependent, however, is who the helpers are, how they invest, and what the impacts of that investment are. In a series of papers that focus on parental and alloparental investment across five populations, this special issue of Human Nature uses evolutionary theory to examine how socioecological context influences modes of direct parental investment among the boat-dwelling Shodagor of Bangladesh (Starkweather), modes of indirect paternal investment in the modern United States (Anderson), and the biological outcome of paternal investment for men in Jamaica (Gray et al...
March 9, 2017: Human Nature: An Interdisciplinary Biosocial Perspective
https://www.readbyqxmd.com/read/28272114/medical-student-perceptions-of-feedback-and-feedback-behaviors-within-the-context-of-the-educational-alliance
#8
Lucy Bowen, Michelle Marshall, Deborah Murdoch-Eaton
PURPOSE: Using the "educational alliance" as a conceptual framework, the authors explored medical students' beliefs about feedback and how their feedback behaviors reflect their perceptions. METHOD: Five focus groups (four to six medical students each) at one UK medical school in 2015 were used to capture and elucidate learners' feedback perceptions and behaviors within the context of the learner-educator relationship. A map of key feedback opportunities across the program was used as a tool for exploring student engagement with the feedback process...
March 7, 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/28263079/%C3%AF-expansive-heteroleptic-ruthenium-ii-complexes-as-reverse-saturable-absorbers-and-photosensitizers-for-photodynamic-therapy
#9
Li Wang, Huimin Yin, Mohammed A Jabed, Marc Hetu, Chengzhe Wang, Susan Monro, Xiaolin Zhu, Svetlana Kilina, Sherri A McFarland, Wenfang Sun
Five heteroleptic tris-diimine ruthenium(II) complexes [RuL(N^N)2](PF6)2 (where L is 3,8-di(benzothiazolylfluorenyl)-1,10-phenanthroline and N^N is 2,2'-bipyridine (bpy) (1), 1,10-phenanthroline (phen) (2), 1,4,8,9-tetraazatriphenylene (tatp) (3), dipyrido[3,2-a:2',3'-c]phenazine (dppz) (4), or benzo[i]dipyrido[3,2-a:2',3'-c]phenazine (dppn) (5), respectively) were synthesized. The influence of π-conjugation of the ancillary ligands (N^N) on the photophysical properties of the complexes was investigated by spectroscopic methods and simulated by density functional theory (DFT) and time-dependent DFT...
March 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28257319/contextual-challenges-to-safe-surgery-in-a-resource-limited-setting-a-multicenter-multiprofessional-qualitative-study
#10
John W Scott, Yihan Lin, Georges Ntakiyiruta, Zeta A Mutabazi, William Austin Davis, Megan A Morris, Douglas S Smink, Robert Riviello, Steven Yule
OBJECTIVES: Safe surgery should be available to all patients, no matter the setting. The purpose of this study was to explore the contextual-specific challenges to safe surgical care encountered by surgeons and surgical teams in many in low- and middle-income countries (LMICs), and to understand the ways in which surgical teams overcome them. BACKGROUND: Optimal surgical performance is highly complex and requires providers to integrate and communicate information regarding the patient, task, team, and environment to coordinate team-based care that is timely, effective, and safe...
March 2, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28256866/cornering-gapless-quantum-states-via-their-torus-entanglement
#11
William Witczak-Krempa, Lauren E Hayward Sierens, Roger G Melko
The entanglement entropy (EE) has emerged as an important window into the structure of complex quantum states of matter. We analyze the universal part of the EE for gapless systems on tori in 2D and 3D, denoted by χ. Focusing on scale-invariant systems, we derive general nonperturbative properties for the shape dependence of χ and reveal surprising relations to the EE associated with corners in the entangling surface. We obtain closed-form expressions for χ in 2D and 3D within a model that arises in the study of conformal field theories (CFTs), and we use them to obtain Ansätze without fitting parameters for the 2D and 3D free boson CFTs...
February 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28249448/perspective-explicitly-correlated-electronic-structure-theory-for-complex-systems
#12
Andreas Grüneis, So Hirata, Yu-Ya Ohnishi, Seiichiro Ten-No
The explicitly correlated approach is one of the most important breakthroughs in ab initio electronic structure theory, providing arguably the most compact, accurate, and efficient ansatz for describing the correlated motion of electrons. Since Hylleraas first used an explicitly correlated wave function for the He atom in 1929, numerous attempts have been made to tackle the significant challenges involved in constructing practical explicitly correlated methods that are applicable to larger systems. These include identifying suitable mathematical forms of a correlated wave function and an efficient evaluation of many-electron integrals...
February 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28235785/emergence-of-communities-and-diversity-in-social-networks
#13
Xiao Han, Shinan Cao, Zhesi Shen, Boyu Zhang, Wen-Xu Wang, Ross Cressman, H Eugene Stanley
Communities are common in complex networks and play a significant role in the functioning of social, biological, economic, and technological systems. Despite widespread interest in detecting community structures in complex networks and exploring the effect of communities on collective dynamics, a deep understanding of the emergence and prevalence of communities in social networks is still lacking. Addressing this fundamental problem is of paramount importance in understanding, predicting, and controlling a variety of collective behaviors in society...
February 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28212112/cancer-as-robust-intrinsic-state-shaped-by-evolution-a-key-issues-review
#14
Ruoshi Yuan, Xiaomei Zhu, Gaowei Wang, Site Li, Ping Ao
Cancer is a complex disease: its pathology cannot be properly understood in terms of independent players-genes, proteins, molecular pathways, or their simple combinations. This is similar to many-body physics of a condensed phase that many important properties are not determined by a single atom or molecule. The rapidly accumulating large 'omics' data also require a new mechanistic and global underpinning to organize for rationalizing cancer complexity. A unifying and quantitative theory was proposed by some of the present authors that cancer is a robust state formed by the endogenous molecular-cellular network, which is evolutionarily built for the developmental processes and physiological functions...
April 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28211758/life-cycle-host-utilization-and-ecological-fitting-for-invasive-lancet-liver-fluke-dicrocoelium-dendriticum-emerging-in-southern-alberta-canada
#15
Bradley van Paridon, John S Gilleard, Douglas D Colwell, Cameron P Goater
The expansion of parasite distributions outside of their native host and geographical ranges has occurred repeatedly over evolutionary time. Contemporary examples include emerging infectious diseases (EID's), many of which pose threats to human, domestic animal, and wildlife populations. Theory predicts that parasites with complex life cycles will be rare as EID's due to constraints imposed by host specialization at each life-cycle stage. In contrast to predictions of this theory, we report 2 new intermediate hosts in the 3-host life cycle of the liver fluke Dicrocoelium dendriticum in Cypress Hills Provincial Park, Alberta, Canada...
February 17, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28211194/a-field-reciprocal-transplant-experiment-reveals-asymmetric-costs-of-migration-between-lake-and-river-ecotypes-of-three-spined-sticklebacks-gasterosteus-aculeatus
#16
Joshka Kaufmann, Tobias L Lenz, Martin Kalbe, Manfred Milinski, Christophe Eizaguirre
Theory of local adaptation predicts that non-adapted migrants will suffer increased costs compared to local residents. Ultimately this process can result in the reduction of gene flow and culminate in speciation. Here, we experimentally investigated the relative fitness of migrants in foreign habitats, focusing on diverging lake and river ecotypes of three-spined sticklebacks. A reciprocal transplant experiment performed in the field revealed asymmetric costs of migration: while mortality of river fish was increased under lake conditions, lake migrants suffered from reduced growth relative to river residents...
February 17, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28208471/analysis-of-thermodiffusive-cellular-instabilities-in-continuum-combustion-fronts
#17
Hossein Azizi, Sebastian Gurevich, Nikolas Provatas
We explore numerically the morphological patterns of thermodiffusive instabilities in combustion fronts with a continuum fuel source, within a range of Lewis numbers and ignition temperatures, focusing on the cellular regime. For this purpose, we generalize the recent model of Brailovsky et al. to include distinct process kinetics and reactant heterogeneity. The generalized model is derived analytically and validated with other established models in the limit of infinite Lewis number for zero-order and first-order kinetics...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28197801/team-sports-performance-analysed-through-the-lens-of-social-network-theory-implications-for-research-and-practice
#18
João Ribeiro, Pedro Silva, Ricardo Duarte, Keith Davids, Júlio Garganta
This paper discusses how social network analyses and graph theory can be implemented in team sports performance analyses to evaluate individual (micro) and collective (macro) performance data, and how to use this information for designing practice tasks. Moreover, we briefly outline possible limitations of social network studies and provide suggestions for future research. Instead of cataloguing discrete events or player actions, it has been argued that researchers need to consider the synergistic interpersonal processes emerging between teammates in competitive performance environments...
February 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28196144/the-evolving-cobweb-of-relations-among-partially-rational-investors
#19
Pietro DeLellis, Anna DiMeglio, Franco Garofalo, Francesco Lo Iudice
To overcome the limitations of neoclassical economics, researchers have leveraged tools of statistical physics to build novel theories. The idea was to elucidate the macroscopic features of financial markets from the interaction of its microscopic constituents, the investors. In this framework, the model of the financial agents has been kept separate from that of their interaction. Here, instead, we explore the possibility of letting the interaction topology emerge from the model of the agents' behavior. Then, we investigate how the emerging cobweb of relationship affects the overall market dynamics...
2017: PloS One
https://www.readbyqxmd.com/read/28195556/how-neuroscience-can-inform-the-study-of-individual-differences-in-cognitive-abilities
#20
Dennis J McFarland
Theories of human mental abilities should be consistent with what is known in neuroscience. Currently, tests of human mental abilities are modeled by cognitive constructs such as attention, working memory, and speed of information processing. These constructs are in turn related to a single general ability. However, brains are very complex systems and whether most of the variability between the operations of different brains can be ascribed to a single factor is questionable. Research in neuroscience suggests that psychological processes such as perception, attention, decision, and executive control are emergent properties of interacting distributed networks...
February 14, 2017: Reviews in the Neurosciences
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