keyword
MENU ▼
Read by QxMD icon Read
search

Complexity theory

keyword
https://www.readbyqxmd.com/read/28822924/local-and-landscape-scale-land-cover-affects-microclimate-and-water-use-in-urban-gardens
#1
Brenda B Lin, Monika H Egerer, Heidi Liere, Shalene Jha, Peter Bichier, Stacy M Philpott
Urban gardens in Central California are highly vulnerable to the effects of climate change, experiencing both extended high heat periods as well as water restrictions because of severe drought conditions. This puts these critical community-based food production systems at risk as California is expected to experience increasing weather extremes. In agricultural systems, increased vegetation complexity, such as greater structure or biodiversity, can increase the resilience of food production systems from climate fluctuations...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822580/otologic-skills-training
#2
REVIEW
Gregory J Wiet, Mads Sølvsten Sørensen, Steven Arild Wuyts Andersen
This article presents a summary of the current simulation training for otologic skills. There is a wide variety of educational approaches, assessment tools, and simulators in use, including simple low-cost task trainers to complex computer-based virtual reality systems. A systematic approach to otologic skills training using adult learning theory concepts, such as repeated and distributed practice, self-directed learning, and mastery learning, is necessary for these educational interventions to be effective...
August 16, 2017: Otolaryngologic Clinics of North America
https://www.readbyqxmd.com/read/28822288/two-sides-of-the-coin-part-2-colloid-and-surface-science-meets-real-biointerfaces
#3
Barry W Ninham, Kåre Larsson, Pierandrea Lo Nostro
Part 1 revisited developments in lipid and surfactant self assembly over the past 40 years [1]. New concepts emerged. Here we explore how these developments can be used to make sense of and bring order to a range of complex biological phenomena. Together with Part 1, this contribution is a fundamental revision of intuition at the boundaries of Colloid Science and Biological interfaces from a perspective of nearly 50 years. We offer new insights on a unified treatment of self assembly of lipids, surfactants and proteins in the light of developments presented in Part 1...
August 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28822236/synthesis-structural-studies-and-biological-activity-of-novel-cu-ii-complexes-with-thiourea-derivatives-of-4-azatricyclo-5-2-1-0-2-6-dec-8-ene-3-5-dione
#4
Aleksandra Drzewiecka-Antonik, Paweł Rejmak, Marcin T Klepka, Anna Wolska, Piotr Pietrzyk, Karolina Stępień, Giuseppina Sanna, Marta Struga
The new Cu(II) complexes of 1/2/3-(bromophenyl)-3-(1,7,8,9-tetramethyl-3,5-dioxo-4-azatricyclo[5.2.1.0(2,6)]dec-8-en-4-yl)thiourea derivatives have been synthesized. The spectroscopic studies together with density functional theory calculations of Cu(II) complexes revealed that two parent ligands coordinate to the copper cation in bidentate fashion via thiocarbonyl S and deprotonated N atoms forming rarely observed four-membered chelate ring, with nearly planar [CuN2S2] moiety. In solid state, the mononuclear complex is formed for thiourea derivative with 3-bromophenyl, whereas for Cu(II) connection with 2- and 4-bromophenyl-thioureas the formation of dinuclear complexes is observed, the latter formed by the stacking of mononuclear complexes...
August 9, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28821642/super-optimal-perceptual-integration-suggests-a-place-based-representation-of-pitch-at-high-frequencies
#5
Bonnie K Lau, Anahita H Mehta, Andrew J Oxenham
Pitch, the perceptual correlate of sound repetition rate or frequency, plays an important role in speech perception, music perception, and listening in complex acoustic environments. Despite its perceptual importance, the neural mechanisms underlying pitch remain poorly understood. Although cortical regions responsive to pitch have been identified, little is known about how pitch information is extracted from the inner ear itself. The two primary theories of peripheral pitch coding involve stimulus-driven spike timing, or phase locking, in the auditory nerve (time code), and the spatial distribution of responses along the length of the cochlear partition (place code)...
August 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821540/investigating-undergraduate-students-use-of-intuitive-reasoning-and-evolutionary-knowledge-in-explanations-of-antibiotic-resistance
#6
Melissa Richard, John D Coley, Kimberly D Tanner
Natural selection is a central concept throughout biology; however, it is a process frequently misunderstood. Bacterial resistance to antibiotic medications provides a contextual example of the relevance of evolutionary theory and is also commonly misunderstood. While research has shed light on student misconceptions of natural selection, minimal study has focused on misconceptions of antibiotic resistance. Additionally, research has focused on the degree to which misconceptions may be based in the complexity of biological information or in pedagogical choices, rather than in deep-seated cognitive patterns...
2017: CBE Life Sciences Education
https://www.readbyqxmd.com/read/28820250/coordination-and-thermodynamics-of-trivalent-curium-with-malonate-at-increased-temperatures-a-spectroscopic-and-quantum-chemical-study
#7
Andrej Skerencak-Frech, Michael Trumm, Daniel R Fröhlich, Petra J Panak
The complexation of Cm(III) with malonate is studied by time-resolved laser fluorescence spectroscopy (TRLFS) in the temperature range from 25 to 90 °C. Three complexes ([Cm(Mal)n](3-2n), n = 1, 2, 3) are identified and their molar fractions are determined as a function of the ligand concentration, the ionic strength, and the temperature. A general shift of the chemical equilibrium toward higher complexes with increasing temperature is observed, with the [CmMal3](3-) complex forming only at T > 40 °C. The conditional stability constants (log K'n(T)) are calculated and extrapolated to Im = 0 with the specific ion interaction theory (SIT)...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28820199/tuning-the-copper-ii-coordination-properties-of-cyclam-by-subtle-chemical-modifications
#8
Nathalie Camus, Nathalie Le Bris, Selbi Nuryyeva, Matthieu Chessé, David Esteban-Gómez, Carlos Platas-Iglesias, Raphaël Tripier, Mourad Elhabiri
The acid-base and copper(ii) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical calculations were combined to investigate the protonation and binding properties of Bn-cyclam-EtOH (L1), oxo-cyclam-EtOH (L2) and oxo-Bn-cyclam-EtOH (L3). These three cyclams are C-functionalized by a hydroxyethyl pendant arm and display either one N-benzyl group and/or an amide replacing one macrocyclic secondary amine...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28819880/theoretical-analysis-of-c-f-bond-cleavage-mediated-by-cob-i-alamin-based-structures
#9
D Cortés-Arriagada, A Toro-Labbe, J R Mora, L Rincón, R Mereau, F J Torres
In the present work, C-F bond cleavage mediated by the super-reduced form of cobalamin (i.e., Co(I)Cbl) was theoretically studied at the ONIOM(BP86/6-311++G(d,p):PM6) + SMD level of theory. Dispersion effects were introduced by employing Grimme's empirical dispersion at the ONIOM(BP86-D/6-311++G(d,p):PM6) + SMD level. In the first stage of the study, cobalamin was characterized in terms of the coordination number of the central cobalt atom. The ONIOM(BP86/6-311++G(d,p):PM6) results showed that the base-off form of the system is slightly more stable than its base-on counterpart (ΔE = E base-off - E base-on ~ -2 kcal/mol)...
August 17, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28819672/folding-sticky-elastica-dynamics-and-reversibility-of-folds-in-langmuir-monolayers
#10
L C Foucard, J M Eaton, M Dennin, Alex J Levine
Lipid monolayers at the air/water interface are often subject to large mechanical stresses when compressed laterally. For large enough compression they fold in the out-of-plane direction to relax stress. The repetitive folding and unfolding of lung surfactant monolayers during breathing plays a critical role in conserving monolayer material at the air/water interface lining the lung. Although the mechanisms behind the folding have been explored recently, relatively little information exists regarding the implications of folding dynamics on the long-term stability of the monolayer...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819583/theoretical-study-of-ni-assisted-c-c-and-c-h-bond-activations-of-propionaldehyde-in-the-gas-phase
#11
Pei-Pei Zhao, Yong-Cheng Wang, Yang Sheng, Yi-Ming Jia
The reactions of Ni(+) with propionaldehyde in the gas phase have been systematically investigated using density functional theory at the B3LYP/def2-TZVP level. The decomposition reaction mechanism has been identified. Our calculations indicated that Ni(+) can assist decomposition of propionaldehyde to form Ni(+)CO and C2H6 through two types of reaction channel: C-C bond activation and C-H bond activation. In addition, charge decomposition analysis (CDA) was carried out to obtain a deeper understanding for orbital interaction of the initial complex...
August 15, 2017: Computational & Theoretical Chemistry
https://www.readbyqxmd.com/read/28819245/fourier-ptychographic-microscopy-with-sparse-representation
#12
Yongbing Zhang, Pengming Song, Jian Zhang, Qionghai Dai
Fourier ptychographic microscopy (FPM) is a novel computational microscopy technique that provides intensity images with both wide field-of-view and high-resolution. By combining ideas from synthetic aperture and phase retrieval, FPM iteratively stitches together a number of variably illuminated, low-resolution intensity images in Fourier space to reconstruct a high-resolution complex sample image. Although FPM is able to bypass the space-bandwidth product (SBP) limit of the optical system, it is vulnerable to the various capturing noises and the reconstruction is easy to trap into the local optimum...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818021/applying-behavior-change-theories-and-qualitative-methods-in-substance-misuse-implementation-research-conceptualizing-the-adoption-of-breaking-free-online-in-real-world-clinical-practice
#13
Stephanie Dugdale, Sarah Elison, Glyn Davies, Jonathan Ward
There is insufficient research examining the implementation of complex novel interventions within health care. This may be due to a lack of qualitative research providing subjective insights into these implementation processes. The authors investigate the advantages of applying behavior change theories to conceptualize qualitative data describing the processes of implementation of complex interventions. Breaking Free Online (BFO), a digital treatment intervention for substance misuse, is described as an example of a complex intervention...
June 2017: Qualitative Health Research
https://www.readbyqxmd.com/read/28817966/attitudes-and-barriers-to-healthy-diet-and-physical-activity-a-latent-profile-analysis
#14
Christine A Vaughan, Madhumita Ghosh-Dastidar, Tamara Dubowitz
Healthy diet and physical activity (PA) prevent and reduce chronic disease. Social cognitive theory delineates multiple attitudes and barriers that influence these behaviors. Understanding covariation in these attitudes and barriers is complex. We examined whether individuals could be grouped into a small number of categories that are easier to study. Interviews were conducted with 982 adults from two low-income, predominantly African American neighborhoods in the same city. Social cognitive constructs, including self-efficacy, social norms, and internal and external barriers to diet and exercise, and walking were self-reported...
August 1, 2017: Health Education & Behavior: the Official Publication of the Society for Public Health Education
https://www.readbyqxmd.com/read/28817573/network-representations-of-angular-regions-for-electromagnetic-scattering
#15
Vito G Daniele, Guido Lombardi, Rodolfo S Zich
Network modeling in electromagnetics is an effective technique in treating scattering problems by canonical and complex structures. Geometries constituted of angular regions (wedges) together with planar layers can now be approached with the Generalized Wiener-Hopf Technique supported by network representation in spectral domain. Even if the network representations in spectral planes are of great importance by themselves, the aim of this paper is to present a theoretical base and a general procedure for the formulation of complex scattering problems using network representation for the Generalized Wiener Hopf Technique starting basically from the wave equation...
2017: PloS One
https://www.readbyqxmd.com/read/28816405/synthesis-density-functional-theory-calculations-and-luminescence-of-lanthanide-complexes-with-2-6-bis-3-methoxybenzylidene-hydrazinocarbonyl-pyridine-schiff-base-ligand
#16
Ziyad A Taha, Taher S Ababneh, Ahmed K Hijazi, Qutaiba Abu-Salem, Abdulaziz M Ajlouni, Shroq Ebwany
A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis[(3-methoxy benzylidene)hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. Lanthanide complexes, Ln-L, {[LnL(NO3 )2 ]NO3 .xH2 O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er)} were prepared and characterized by elemental analysis, molar conductance, thermal analysis (TGA/DTGA), mass spectrometry (MS), Fourier transform infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Ln-L complexes are isostructural with four binding sites provided by two nitro groups along with four coordination sites for L...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816305/real-time-atomic-scale-observation-of-void-formation-and-anisotropic-growth-in-ii-vi-semiconducting-ribbons
#17
Xing Huang, Travis Jones, Hua Fan, Marc-Georg Willinger
Void formation in semiconductors is generally considered to be deteriorating. However, for some systems, void formation and evolution are beneficial and can be used for the fabrication of novel nanostructures. In either scenario, the understanding of void formation and evolution is of both scientific and technical high importance. Herein, using ZnS ribbons as an example, we report real-time observations of void formation and the kinetics of growth at the nano- and atomic scales upon heating. Direct imaging reveals that voids, created by a focused electron beam in wurtzite (WZ) ribbons, have a rectangular shape elongated along the <0001> direction...
August 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28815872/a-multimethod-computational-simulation-approach-for-investigating-mitochondrial-dynamics-and-dysfunction-in-degenerative-aging
#18
Timothy E Hoffman, Katherine J Barnett, Lyle Wallis, William H Hanneman
Research in biogerontology has largely focused on the complex relationship between mitochondrial dysfunction and biological aging. In particular, the mitochondrial free radical theory of aging (MFRTA) has been well accepted. However, this theory has been challenged by recent studies showing minimal increases in reactive oxygen species (ROS) as not entirely deleterious in nature, and even beneficial under the appropriate cellular circumstances. To assess these significant and nonintuitive observations in the context of a functional system, we have taken an in silico approach to expand the focus of the MFRTA by including other key mitochondrial stress response pathways, as they have been observed in the nematode Caenorhabditis elegans...
August 16, 2017: Aging Cell
https://www.readbyqxmd.com/read/28814032/studying-the-implementation-of-iterative-impedance-control-for-assistive-hand-rehabilitation-using-an-exoskeleton
#19
T Martineau, R Vaidyanathan
A positive training synergy can be obtained when two individuals attempt to learn the same motor task while mechanically coupled to one another. In this paper, we have studied how mimicking this interaction through impedance control can be exploited to improve assistance delivered by hand exoskeleton devices during rehabilitation. In this context, the machine and user take complementary roles akin to two coupled individuals. We present the derivation of a dynamic model of the human hand for the purpose of controller development for new hand exoskeleton platforms...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813345/choking-under-pressure-theoretical-models-and-interventions
#20
REVIEW
Christopher Mesagno, Juergen Beckmann
In sport, choking under pressure is a major concern for athletes, coaches and sport psychologists because athletes fail to meet self-imposed performance expectations in critical situations (when it counts the most), which is devastating and embarrassing. Researchers have debated choking under pressure definitions, identified personality characteristics that exacerbate choking outcomes, and examined models to determine mechanisms for choking. Based on these investigations, several interventions to prevent choking have been developed and tested...
August 2017: Current Opinion in Psychology
keyword
keyword
52807
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"