keyword
MENU ▼
Read by QxMD icon Read
search

problem solving

keyword
https://www.readbyqxmd.com/read/28922841/interactive-problem-solving-sessions-in-an-introductory-bioscience-course-engaged-students-and-gave-them-feedback-but-did-not-increase-their-exam-scores
#1
James P McEvoy
Active learning, including the promotion of student interactivity in lectures, has been found to improve student engagement and performance in university science classes. This letter describes the use of Pearson's Learning Catalytics to run regular, formatively assessed problem-solving sessions as part of the semiflipped redesign of an introductory level university bioscience course. Students found the problem-solving sessions more engaging than a traditional lecture, and felt that they were receiving better feedback on their progress in the course...
October 2, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28922119/pure-let-image-deconvolution
#2
Jizhou Li, Florian Luisier, Thierry Blu
We propose a non-iterative image deconvolution algorithm for data corrupted by Poisson or mixed Poisson-Gaussian noise. Many applications involve such a problem, ranging from astronomical to biological imaging. We parametrize the deconvolution process as a linear combination of elementary functions, termed as linear expansion of thresholds (LET). This parametrization is then optimized by minimizing a robust estimate of the true mean squared error, the Poisson unbiased risk estimate (PURE). Each elementary function consists of a Wiener filtering followed by a pointwise thresholding of undecimated Haar wavelet coefficients...
September 18, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28922118/a-fast-gradient-method-for-nonnegative-sparse-regression-with-self-dictionary
#3
Nicolas Gillis, Robert Luce
A nonnegative matrix factorization (NMF) can be computed efficiently under the separability assumption, which asserts that all the columns of the given input data matrix belong to the cone generated by a (small) subset of them. The provably most robust methods to identify these conic basis columns are based on nonnegative sparse regression and self dictionaries, and require the solution of large-scale convex optimization problems. In this paper we study a particular nonnegative sparse regression model with self dictionary...
September 18, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28922115/colour-constancy-beyond-the-classical-receptive-field
#4
Arash Akbarinia, C Alejandro Parraga
The problem of removing illuminant variations to preserve the colours of objects (colour constancy) has already been solved by the human brain using mechanisms that rely largely on centre-surround computations of local contrast. In this paper we adopt some of these biological solutions described by long known physiological findings into a simple, fully automatic, functional model (termed Adaptive Surround Modulation or ASM). In ASM, the size of a visual neuron's receptive field (RF) as well as the relationship with its surround varies according to the local contrast within the stimulus, which in turn determines the nature of the centre-surround normalisation of cortical neurons higher up in the processing chain...
September 18, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28921660/rapid-whole-brain-gray-matter-imaging-using-single-slab-three-dimensional-dual-echo-fast-spin-echo-a-feasibility-study
#5
Hyunyeol Lee, Eung Yeop Kim, Chul-Ho Sohn, Jaeseok Park
PURPOSE: To achieve rapid, high resolution whole-brain gray matter (GM) imaging by developing a novel, single-slab three-dimensional dual-echo fast-spin-echo pulse sequence and GM-selective reconstruction. METHODS: Unlike conventional GM imaging that uses time-consuming double-inversion-recovery preparation, the proposed pulse sequence was designed to have two split portions along the echo train, in which the first half was dedicated to yield short inversion recovery (IR)-induced white matter suppression and variable-flip-angle-induced two-step GM signal evolution while the second half cerebrospinal fluid-only signals...
September 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28921402/an-improved-risk-explicit-interval-linear-programming-model-for-pollution-load-allocation-for-watershed-management
#6
Bisheng Xia, Xin Qian, Hong Yao
Although the risk-explicit interval linear programming (REILP) model has solved the problem of having interval solutions, it has an equity problem, which can lead to unbalanced allocation between different decision variables. Therefore, an improved REILP model is proposed. This model adds an equity objective function and three constraint conditions to overcome this equity problem. In this case, pollution reduction is in proportion to pollutant load, which supports balanced development between different regional economies...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28921043/slow-wave-activity-and-executive-dysfunction-in-children-with-sleep-disordered-breathing
#7
Jessica A Christiansz, Chloe R Lappin, Aidan J Weichard, Gillian M Nixon, Margot J Davey, Rosemary S C Horne, Sarah N Biggs
PURPOSE: This study aimed to examine slow wave activity (SWA), a marker of homeostatic regulation, as a potential mechanism linking sleep disordered breathing (SDB) with executive dysfunction in children. METHODS: Executive function domains of working memory, spatial planning, information processing, and sustained attention were assessed using the Cambridge Neuropsychological Test Automated Battery (CANTAB) in children (N = 40; 5-12 years) referred for clinical diagnosis of SDB...
September 18, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28920712/maximized-nanodrug-loaded-mesenchymal-stem-cells-by-a-dual-drug-loaded-mode-for-the-systemic-treatment-of-metastatic-lung-cancer
#8
Sen Yao, Xuqian Li, Jingxuan Liu, Yuqing Sun, Zhuanhe Wang, Yanyan Jiang
Mesenchymal stem cells (MSCs), exhibiting tumor-tropic and migratory potential, can serve as cellular carriers to improve the effectiveness of anticancer agents. However, several challenges, such as the safety issue, the limited drug loading, the conservation of stemness and migration of MSCs, still remain in the MSC-based delivery system. In the present study, a novel nano-engineered MSC delivery system was established by loading doxorubicin (DOX)-polymer conjugates for the systemic treatment of pulmonary metastasis of breast cancer...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28920390/-advance-of-heterologous-expression-study-of-eukaryote-origin-laccases
#9
Na Ning, Huijun Tan, Xinxin Sun, Jinfeng Ni
Laccases are enzymes belonging to the group of multi-copper oxidases. These enzymes are widely distributed in insects, plants, fungi and bacteria. In general, laccases can oxidize an exceptionally high number of substrates, so they have broad applications in textile, pulp, food and the degradation of lignin. However, low yield, low activity and thermo-instability of laccase in nature limit the application of laccase. High efficient heterologous expression of the protein is an effective way for solving this problem...
April 25, 2017: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/28919870/stress-time-pressure-strategy-selection-and-math-anxiety-in-mathematics-a-review-of-the-literature
#10
REVIEW
Sara Caviola, Emma Carey, Irene C Mammarella, Denes Szucs
We review how stress induction, time pressure manipulations and math anxiety can interfere with or modulate selection of problem-solving strategies (henceforth "strategy selection") in arithmetical tasks. Nineteen relevant articles were identified, which contain references to strategy selection and time limit (or time manipulations), with some also discussing emotional aspects in mathematical outcomes. Few of these take cognitive processes such as working memory or executive functions into consideration. We conclude that due to the sparsity of available literature our questions can only be partially answered and currently there is not much evidence of clear associations...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28919469/assignment-of-the-absolute-configuration-of-hepatoprotective-highly-oxygenated-triterpenoids-using-x-ray-ecd-nmr-j-based-configurational-analysis-and-hsqc-overlay-experiments
#11
Xiaojuan Wang, Jiabao Liu, Pankaj Pandey, Jiabao Chen, Frank R Fronczek, Stuart Parnham, Xinzhu Qi, Robert J Doerksen, Daneel Ferreira, Hua Sun, Shuai Li, Mark T Hamann
BACKGROUND: The plants of the genus Kadsura are widely distributed in China, South Korea, and Japan. Their roots and stems are traditionally used to treat blood diseases and pain. The main bioactive constituents of Kadsura longipedunculata comprise highly oxygenated triterpenoids. Schiartane-type nortriterpenoids showed anti-HIV, anti-HBV, and cytotoxic bioactivities. For such compounds, the absolute configuration influences the bioactivities, and hence its unambiguous determination is essential...
September 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28917795/portable-near-infrared-spectroscopy-applied-to-quality-control-of-brazilian-coffee
#12
Radigya M Correia, Flavia Tosato, Eloilson Domingos, Rayza R T Rodrigues, Luiz Felipe M Aquino, Paulo R Filgueiras, Valdemar Lacerda, Wanderson Romão
The use of portable micro-spectrometers such as a micro near infrared region (microNIR) spectrometer is a promising technique for solving analytical problems in several areas of science. This work evaluated the potential of microNIR in quality control of Arabica coffee. Arabica coffee has a high commercial value product, motivating the development of analytical methods with high sensitivity and accuracy for detection of its adulteration. Herein, microNIR was successfully used to determine the quality of Arabica coffee by identification and quantification of adulterations such as Robusta coffee (in different roasting levels), as well as corn, peels, and sticks...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917133/waiting-for-lexical-access-cochlear-implants-or-severely-degraded-input-lead-listeners-to-process-speech-less-incrementally
#13
Bob McMurray, Ashley Farris-Trimble, Hannah Rigler
Spoken language unfolds over time. Consequently, there are brief periods of ambiguity, when incomplete input can match many possible words. Typical listeners solve this problem by immediately activating multiple candidates which compete for recognition. In two experiments using the visual world paradigm, we examined real-time lexical competition in prelingually deaf cochlear implant (CI) users, and normal hearing (NH) adults listening to severely degraded speech. In Experiment 1, adolescent CI users and NH controls matched spoken words to arrays of pictures including pictures of the target word and phonological competitors...
September 13, 2017: Cognition
https://www.readbyqxmd.com/read/28916578/nutritional-sustainability-aligning-priorities-in-nutrition-and-public-health-with-agricultural-production
#14
REVIEW
John W Finley, Dennis Dimick, Elizabeth Marshall, Gerald Charles Nelson, Jonathan R Mein, David I Gustafson
Nutrition science-based dietary advice urges changes that may have a great impact on agricultural systems. For example, the 2016 Dietary Guidelines for Americans (DGA) recommends greatly increased fruit and vegetable consumption, but the present domestic production is insufficient to accommodate large-scale adoption of these guidelines. Increasing production to the extent needed to meet the DGA will necessitate changes in an already stressed agriculture and food system and will require nutrition and agriculture professionals to come together in open and collegial discourse...
September 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28916381/perspectives-on-the-production-structural-characteristics-and-potential-applications-of-bioplastics-derived-from-polyhydroxyalkanoates
#15
REVIEW
Priscilla B S Albuquerque, Carolina B Malafaia
Since the last two decades, the use of synthetic materials has increased and become more frequent in this capitalist system. Polymers used as raw materials are usually disposed very rapidly and considered serious damages when they return to the environment. Because of this behaviour, there was an increasing in the global awareness by minimizing the waste generated, in addition to the scientific community concern for technological alternatives to solve this problem. Alternatively, biodegradable polymers are attracting special interest due to their inherent properties, which are similar to the ones of the conventional plastics...
September 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28916314/immunization-with-recombinant-gntr-plasmid-confers-protection-against-brucella-challenge-in-balb-c-mice
#16
Zhiqiang Li, Shuli Wang, Hui Zhang, Li Xi, Jinliang Zhang, Xiaogen Zhang, Jincheng Han, Junbo Zhang
It is essential to improve animal vaccine for brucellosis since conventional vaccines are residual virulent and poor protective effect, limit their applications. To solve these problems, the recombinant DNA vaccines were appeared, which could improve protective immunity and were attenuated to animals. In current research, the recombinant DNA vaccine (pVGntR) based on transcriptional regulator GntR of Brucella abortus (B. abortus) was constructed. The results show that pVGntR is significantly more protective than the conventional RB51 vaccine...
September 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28916041/polydopamine-functionalized-poly-ether-ether-ketone-tube-for-capillary-electrophoresis-mass-spectrometry
#17
Wei Zhou, Wenpeng Zhang, Yikun Liu, Xinhong Yu, Zilin Chen
Capillary electrophoresis-mass spectrometry (CE-MS) is a hyphenated technique that combines the advantages like low sample consumption, high separation efficiency, short analytical time in CE and high sensitivity, powerful molecular structure elucidation in MS. Polyimide-coated fused silica capillary has become the most dominant capillary for CE, but it suffers from swelling and aminolysis of polyimide coating when treated with organic solvents and alkaline buffer in the CE-MS interface in which the polyimide coating at the end of the capillary is exposed to the solution, and this phenomenon can result in current instability, irregular electrospray and clogging at outlet after prolonged use...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28916032/polymer-inclusion-membranes-pims-in-chemical-analysis-a-review
#18
REVIEW
M Inês G S Almeida, Robert W Cattrall, Spas D Kolev
This review highlights the increasing interest in polymer inclusion membranes (PIMs) in analytical chemistry as they are adapted to new and novel applications. PIMs are polymer-based liquid membranes and were first introduced 50 years ago as the sensing membranes in ion-selective electrodes and optodes. More recently however, PIMs have been used for other applications in analytical chemistry such as for sample separation, sample pre-concentration, electro-driven extraction, and passive sampling, and have also been incorporated into on-line and automated analysis systems...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915872/risk-factors-of-chronic-periodontitis-on-healing-response-a-multilevel-modelling-analysis
#19
J Song, H Zhao, C Pan, C Li, J Liu, Y Pan
BACKGROUND: Chronic periodontitis is a multifactorial polygenetic disease with an increasing number of associated factors that have been identified over recent decades. Longitudinal epidemiologic studies have demonstrated that the risk factors were related to the progression of the disease. A traditional multivariate regression model was used to find risk factors associated with chronic periodontitis. However, the approach requirement of standard statistical procedures demands individual independence...
September 15, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/28915311/can-increased-spatial-resolution-solve-the-crossing-fiber-problem-for-diffusion-mri
#20
Kurt Schilling, Yurui Gao, Vaibhav Janve, Iwona Stepniewska, Bennett A Landman, Adam W Anderson
It is now widely recognized that voxels with crossing fibers or complex geometrical configurations present a challenge for diffusion MRI (dMRI) reconstruction and fiber tracking, as well as microstructural modeling of brain tissues. This "crossing fiber" problem has been estimated to affect anywhere from 30% to as many as 90% of white matter voxels, and it is often assumed that increasing spatial resolution will decrease the prevalence of voxels containing multiple fiber populations. The aim of this study is to estimate the extent of the crossing fiber problem as we progressively increase the spatial resolution, with the goal of determining whether it is possible to mitigate this problem with higher resolution spatial sampling...
September 15, 2017: NMR in Biomedicine
keyword
keyword
39164
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"