keyword
MENU ▼
Read by QxMD icon Read
search

metrics

keyword
https://www.readbyqxmd.com/read/28813098/modeling-and-mapping-basal-area-of-pinus-taeda-l-plantation-using-airborne-lidar-data
#1
Carlos A Silva, Carine Klauberg, Andrew T Hudak, Lee A Vierling, Scott J Fennema, Ana Paula D Corte
Basal area (BA) is a good predictor of timber stand volume and forest growth. This study developed predictive models using field and airborne LiDAR (Light Detection and Ranging) data for estimation of basal area in Pinus taeda plantation in south Brazil. In the field, BA was collected from conventional forest inventory plots. Multiple linear regression models for predicting BA from LiDAR-derived metrics were developed and evaluated for predictive power and parsimony. The best model to predict BA from a family of six models was selected based on corrected Akaike Information Criterion (AICc) and assessed by the adjusted coefficient of determination (adj...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28812906/recent-advances-in-ct-imaging-in-chronic-obstructive-pulmonary-disease
#2
Sandeep Bodduluri, Joseph M Reinhardt, Eric A Hoffman, John D Newell, Surya P Bhatt
Lung imaging is increasingly being used to diagnose, quantify and phenotype chronic obstructive pulmonary disease (COPD). Although spirometry is the gold standard for the diagnosis of COPD and for severity staging, the role of computed tomography (CT) imaging has expanded in both clinical practice and research. COPD is a heterogeneous disease with considerable variability in clinical features, radiographic disease, progression and outcomes. Recent studies have examined the utility of CT imaging in enhancing diagnostic certainty, improving phenotyping, predicting disease progression and prognostication, patient selection for intervention, and also in furthering our understanding of the complex pathophysiology of this disease...
August 16, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28812618/plant-spatial-patterns-identify-alternative-ecosystem-multifunctionality-states-in-global-drylands
#3
Miguel Berdugo, Sonia Kéfi, Santiago Soliveres, Fernando T Maestre
The response of drylands to environmental gradients can be abrupt rather than gradual. These shifts largely occur unannounced and are difficult to reverse once they happen; their prompt detection is of crucial importance. The distribution of vegetation patch sizes may indicate the proximity to these shifts, but the use of this metric is hampered by a lack of large-scale studies relating these distributions to the provision of multiple ecosystem functions (multifunctionality) and comparing them to other ecosystem attributes, such as total plant cover...
January 9, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812601/recent-extinctions-disturb-path-to-equilibrium-diversity-in-caribbean-bats
#4
Luis Valente, Rampal S Etienne, Liliana M Dávalos
Islands are ideal systems to model temporal changes in biodiversity and reveal the influence of humans on natural communities. Although theory predicts biodiversity on islands tends towards an equilibrium value, the recent extinction of large proportions of island biotas complicates testing this model. The well-preserved subfossil record of Caribbean bats-involving multiple insular radiations-provides a rare opportunity to model diversity dynamics in an insular community. Here, we reconstruct the diversity trajectory in noctilionoid bats of the Greater Antilles by applying a dynamic model of colonization, extinction and speciation to phylogenetic and palaeontological data including all known extinct and extant species...
January 9, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812552/competition-along-trajectories-governs-adaptation-rates-towards-antimicrobial-resistance
#5
C Brandon Ogbunugafor, Margaret J Eppstein
The increasing availability of genotype-phenotype maps for different combinations of mutations has empowered evolutionary biologists with the tools to interrogate the predictability of adaptive evolution, especially in the context of the evolution of antimicrobial resistance. Large microbial populations are known to generate competing beneficial mutations, but determining how these mutations contribute to the adaptive trajectories that are most likely to be followed remains a challenge. Despite a recognition that there may also be competition between successive alleles on the same trajectory, prior studies have not fully considered how this impacts adaptation rates along, or likelihood of following, individual trajectories...
November 21, 2016: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812161/a-proficiency-based-virtual-reality-endoscopy-curriculum-improves-performance-on-the-fundamentals-of-endoscopic-surgery-examination
#6
Daniel A Hashimoto, Emil Petrusa, Roy Phitayakorn, Christina Valle, Brenna Casey, Denise Gee
INTRODUCTION: The fundamentals of endoscopic surgery (FES) examination is a national test of knowledge and skill in flexible gastrointestinal endoscopy. The skill portion of the examination involves five tasks that assesses the following skills: scope navigation, loop reduction, mucosal inspection, retroflexion, and targeting. This project aimed to assess the efficacy of a proficiency-based virtual reality (VR) curriculum in preparing residents for the FES skills exam. METHODS: Experienced (>100 career colonoscopies) and inexperienced endoscopists (<50 career colonoscopies) were recruited to participate...
August 15, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28812069/the-sensitivity-of-folding-free-energy-landscapes-of-trpzips-to-mutations-in-the-hydrophobic-core
#7
Madhulika Gupta, Prabir Khatua, Charusita Chakravarty, Sanjoy Bandyopadhyay
The sensitivity of the stability of folded states and free energy landscapes to the differences in the hydrophobic content of the core residues has been studied for the set of 16-residue trpzips, namely, Trpzip4, Trpzip5 and Trpzip6. The combination of principal component analysis and different secondary structure order metrics as reaction coordinates has been used to characterize and identify all the underlying attractive basins corresponding to the folded and the unfolded states for each trpzip at 300 K. Our results reveal that even a single mutation in the hydrophobic core perturbs the stability of the folded peptide and the conformational preferences for the partially folded and unfolded states significantly, leading to concomitant alterations in the free energy landscape of trpzips...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28812033/epidemiology-of-injuries-identified-at-the-nfl-scouting-combine-and-their-impact-on-performance-in-the-national-football-league-evaluation-of-2203-athletes-from-2009-to-2015
#8
Brendin R Beaulieu-Jones, William H Rossy, George Sanchez, James M Whalen, Kyle P Lavery, Kevin J McHale, Bryan G Vopat, Joseph J Van Allen, Ramesses A Akamefula, Matthew T Provencher
BACKGROUND: At the annual National Football League (NFL) Scouting Combine, the medical staff of each NFL franchise performs a comprehensive medical evaluation of all athletes potentially entering the NFL. Currently, little is known regarding the overall epidemiology of injuries identified at the combine and their impact on NFL performance. PURPOSE: To determine the epidemiology of injuries identified at the combine and their impact on initial NFL performance. STUDY DESIGN: Cohort study; Level of evidence, 3...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28811658/political-pressures-increased-vulnerability-to-climate-hazards-for-nomadic-livestock-in-inner-mongolia-china
#9
Ang Li, Shi Chen, Xueyao Zhang, Jianhui Huang
Herders in Inner Mongolia experienced two completely different political periods during their last nomadic period between 1961 and 1986. However, climate and technical factors were very similar between these two periods according to statistical analyses. We retrieved historical climate and livestock population data and performed a retrospective study using generalized additive models to analyze three major livestock population demographic metrics changes between these two periods. We found that the sociopolitical factors significantly impacted all three major demographic metrics (adult mortality, neonatal mortality and birthrate) between the two periods for both large (cattle, horse, and camel) and small livestock (sheep and goat)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811648/scale-dependent-changes-in-the-functional-diversity-of-macrophytes-in-subtropical-freshwater-lakes-in-south-china
#10
Hui Fu, Jiayou Zhong, Shaowen Fang, Jianmin Hu, Chunjing Guo, Qian Lou, Guixiang Yuan, Taotao Dai, Zhongqiang Li, Meng Zhang, Wei Li, Jun Xu, Te Cao
Ecological processes are generally scale-dependent and there is little consensus about the relative importance of deterministic versus stochastic processes in driving patterns of biological diversity. We investigated how the relationship between functional dispersion and environmental gradients changes with spatial scale in subtropical freshwater lakes. The functional alpha and beta dispersions of all the tested traits were significantly under-dispersed across spatial scales and along environmental gradients...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811562/loop-quantum-cosmology-and-singularities
#11
Ward Struyve
Loop quantum gravity is believed to eliminate singularities such as the big bang and big crunch singularity. This belief is based on studies of so-called loop quantum cosmology which concerns symmetry-reduced models of quantum gravity. In this paper, the problem of singularities is analysed in the context of the Bohmian formulation of loop quantum cosmology. In this formulation there is an actual metric in addition to the wave function, which evolves stochastically (rather than deterministically as the case of the particle evolution in non-relativistic Bohmian mechanics)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811527/atherosusceptible-shear-stress-activates-endoplasmic-reticulum-stress-to-promote-endothelial-inflammation
#12
Keith A Bailey, Fawaz G Haj, Scott I Simon, Anthony G Passerini
Atherosclerosis impacts arteries where disturbed blood flow renders the endothelium susceptible to inflammation. Cytokine activation of endothelial cells (EC) upregulates VCAM-1 receptors that target monocyte recruitment to atherosusceptible regions. Endoplasmic reticulum (ER) stress elicits EC dysregulation in metabolic syndrome. We hypothesized that ER plays a central role in mechanosensing of atherosusceptible shear stress (SS) by signaling enhanced inflammation. Aortic EC were stimulated with low-dose TNFα (0...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811468/inferring-structural-connectivity-using-ising-couplings-in-models-of-neuronal-networks
#13
Balasundaram Kadirvelu, Yoshikatsu Hayashi, Slawomir J Nasuto
Functional connectivity metrics have been widely used to infer the underlying structural connectivity in neuronal networks. Maximum entropy based Ising models have been suggested to discount the effect of indirect interactions and give good results in inferring the true anatomical connections. However, no benchmarking is currently available to assess the performance of Ising couplings against other functional connectivity metrics in the microscopic scale of neuronal networks through a wide set of network conditions and network structures...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810955/embedded-mental-health-promotion-of-psychological-hygiene-within-a-submarine-squadron
#14
James Rapley, John Chin, Brian McCue, Mathew Rariden
INTRODUCTION: Psychological fitness is an important component to operational unit readiness and success. Embedding behavioral health providers can reduce unplanned personnel losses (UPL) as a result of psychological stress. The U.S. Submarine Forces implemented the Submarine Squadron 6 (CSS-6) Embedded Mental Health Pilot (EMHP) Program to address this type of UPL, which is classified as a Code 2 loss. The aim of the study is to evaluate the effectiveness of the EMHP Program at reducing UPL by improving psychological readiness through expedited access to care...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28810919/patterns-of-resident-health-workforce-turnover-and-retention-in-remote-communities-of-the-northern-territory-of-australia-2013-2015
#15
Deborah J Russell, Yuejen Zhao, Steven Guthridge, Mark Ramjan, Michael P Jones, John S Humphreys, John Wakerman
BACKGROUND: The geographical maldistribution of the health workforce is a persisting global issue linked to inequitable access to health services and poorer health outcomes for rural and remote populations. In the Northern Territory (NT), anecdotal reports suggest that the primary care workforce in remote Aboriginal communities is characterised by high turnover, low stability and high use of temporary staffing; however, there is a lack of reliable information to guide workforce policy improvements...
August 15, 2017: Human Resources for Health
https://www.readbyqxmd.com/read/28810820/quantitative-label-free-evaluation-of-tissue-engineered-skeletal-muscle-through-multiphoton-microscopy
#16
Brian C Syverud, Mary-Ann Mycek, Lisa Marie Larkin
The lack of tools for assessing engineered tissue viability and function in a non-invasive manner is a major regulatory and translational challenge facing tissue engineers. Label-free, nonlinear optical molecular imaging (OMI) has utilized endogenous nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) fluorescence to indicate metabolic activity. Similarly, second harmonic generation (SHG) signals from myosin and collagen can measure overall muscle structural integrity and function...
August 16, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28810816/prosody-of-dual-focus-in-german-interaction-between-focus-and-phrasing
#17
Bei Wang, Caroline Féry
This paper studies the prosodic realization of dual-focus in German, that is, two foci in a single sentence, with special consideration of the interaction between focus assignment and phrasing. In a production experiment, dual-focus was compared with its initial, final, and all-new counterparts in sentences with subject NPs and VPs of different lengths. The results showed that there were three different patterns of dual-focus realization: (1) The most frequent one was the two-peak pattern (57.8%), that is, a falling tone on both focused words and compressed and lowered pitch in-between; (2) the second most frequent was the two-phrase realization (23...
August 1, 2017: Language and Speech
https://www.readbyqxmd.com/read/28810037/quantitative-features-of-the-choriocapillaris-in-healthy-individuals-using-swept-source-optical-coherence-tomography-angiography
#18
Mayss Al-Sheikh, Khalil Ghasemi Falavarjani, Maximilian Pfau, Akihito Uji, Phillip P Le, SriniVas R Sadda
BACKGROUND AND OBJECTIVE: To quantify vessel density (VD) and grey value (GV) as a measure of flow in the choriocapillaris (CC) in healthy subjects with optical coherence tomography angiography (OCTA). PATIENTS AND METHODS: In this prospective, noncomparative case series, 3 mm × 3 mm OCTA images of 36 eyes of 22 healthy individuals were obtained using a swept-source instrument. VD and GV levels were calculated on CC en face slabs in the central 1-mm (subfoveal field) and surrounding 2...
August 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28809960/metrics-for-comparing-neuronal-tree-shapes-based-on-persistent-homology
#19
Yanjie Li, Dingkang Wang, Giorgio A Ascoli, Partha Mitra, Yusu Wang
As more and more neuroanatomical data are made available through efforts such as NeuroMorpho.Org and FlyCircuit.org, the need to develop computational tools to facilitate automatic knowledge discovery from such large datasets becomes more urgent. One fundamental question is how best to compare neuron structures, for instance to organize and classify large collection of neurons. We aim to develop a flexible yet powerful framework to support comparison and classification of large collection of neuron structures efficiently...
2017: PloS One
https://www.readbyqxmd.com/read/28809933/using-light-dependent-scleractinia-to-define-the-upper-boundary-of-mesophotic-coral-ecosystems-on-the-reefs-of-utila-honduras
#20
Jack H Laverick, Dominic A Andradi-Brown, Alex D Rogers
Shallow water zooxanthellate coral reefs grade into ecologically distinct mesophotic coral ecosystems (MCEs) deeper in the euphotic zone. MCEs are widely considered to start at an absolute depth limit of 30m deep, possibly failing to recognise that these are distinct ecological communities that may shift shallower or deeper depending on local environmental conditions. This study aimed to explore whether MCEs represent distinct biological communities, the upper boundary of which can be defined and whether the depth at which they occur may vary above or below 30m...
2017: PloS One
keyword
keyword
41857
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"