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https://www.readbyqxmd.com/read/29046057/bile-duct-ligature-in-young-rats-a-revisited-animal-model-for-biliary-atresia
#1
Matias Garrido, Camila Escobar, Constanza Zamora, Carolina Rejas, Juan Varas, Mario Párraga, Sebastian San Martin, Sandra Montedónico
Biliary atresia leads to cirrhosis in the vast majority of patients and constitutes the first cause of paediatric liver transplantation. Animal models allow us to understand the molecular basis and natural history of diseases. The aim of this study is to describe a surgically created animal model of biliary atresia with emphasis in long-term liver function. Forty-two 3-week-old Sprague-Dawley rats were randomly divided into two groups: bile duct ligature (BDL) and control. The animals were sacrificed on the 2nd, 4th, and 6th postoperative weeks...
September 13, 2017: European Journal of Histochemistry: EJH
https://www.readbyqxmd.com/read/29045985/entry-of-medical-school-graduates-into-family-medicine-residencies-2016-2017
#2
Stanley M Kozakowski, Alexandra Travis, Julie P Marcinek, Ashley Bentley, Gerald T Fetter
This annual report is an expansion on previous reports in this series that provides further evidence that the current medical school system is failing, collectively, to produce the primary care workforce that is needed to achieve optimal health in the United States. Inclusion of data on the performance of DO-granting and international medical schools, creates a more complete and complex picture of the contribution of all medical school types to the primary care workforce that should allow stakeholders to set goals, identify institutions with models from which to learn, and develop strategies for continuous improvement...
October 2017: Family Medicine
https://www.readbyqxmd.com/read/29045938/effectiveness-of-nivolumab-versus-docetaxel-as-second-line-treatment-in-non-small-cell-lung-cancer-patients-in-clinical-practice
#3
Pablo Calpe-Armero, Rafael Ferriols-Lisart, Francisco Ferriols-Lisart, Alejandro Pérez-Pitarch
AIMS: To evaluate the effectiveness of nivolumab as second-line treatment compared to standard therapy with docetaxel in adult patients with non-small cell lung cancer (NSCLC) in clinical practice. METHODS: This is an observational, retrospective cohort study of adult patients diagnosed with NSCLC, stage III-IV, treated with docetaxel or nivolumab as second-line treatment. The end points evaluated were overall survival (OS) and progression-free survival (PFS). PFS and OS were described using the Kaplan-Meier method...
October 19, 2017: Chemotherapy
https://www.readbyqxmd.com/read/29045882/untangling-the-hairball-fitness-based-asymptotic-reduction-of-biological-networks
#4
Félix Proulx-Giraldeau, Thomas J Rademaker, Paul François
Complex mathematical models of interaction networks are routinely used for prediction in systems biology. However, it is difficult to reconcile network complexities with a formal understanding of their behavior. Here, we propose a simple procedure (called ϕ¯) to reduce biological models to functional submodules, using statistical mechanics of complex systems combined with a fitness-based approach inspired by in silico evolution. The ϕ¯ algorithm works by putting parameters or combination of parameters to some asymptotic limit, while keeping (or slightly improving) the model performance, and requires parameter symmetry breaking for more complex models...
October 17, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/29045866/how-many-protein-sequences-fold-to-a-given-structure-a-coevolutionary-analysis
#5
Pengfei Tian, Robert B Best
Quantifying the relationship between protein sequence and structure is key to understanding the protein universe. A fundamental measure of this relationship is the total number of amino acid sequences that can fold to a target protein structure, known as the "sequence capacity," which has been suggested as a proxy for how designable a given protein fold is. Although sequence capacity has been extensively studied using lattice models and theory, numerical estimates for real protein structures are currently lacking...
October 17, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/29045754/genomic-studies-of-local-adaptation-in-natural-plant-populations
#6
Victoria L Sork
Local adaptation arises as a result of selection by the local environment favoring phenotypes that enhance fitness. Geographic patterns of phenotypic variation are in part due to this selective process. Classically, the genetic basis of those phenotypes has been studied in plant populations using a quantitative genetic approach in which plants from different source populations are grown in common environments, in reciprocal transplant experiments, or in studies across a wide geographic and environmentally heterogeneous area...
October 14, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29045679/prostate-cancer-patient-characteristics-associated-with-a-strong-preference-to-preserve-sexual-function-and-receipt-of-active-surveillance
#7
James R Broughman, Ramsankar Basak, Matthew E Nielsen, Bryce B Reeve, Deborah S Usinger, Kiayni C Spearman, Paul A Godley, Ronald C Chen
Background: Men with early-stage prostate cancer have multiple options that have similar oncologic efficacy but vary in terms of their impact on quality of life. In low-risk cancer, active surveillance is the option that best preserves patients' sexual function, but it is unknown if patient preference affects treatment selection. Our objectives were to identify patient characteristics associated with a strong preference to preserve sexual function and to determine whether patient preference and baseline sexual function level are associated with receipt of active surveillance in low-risk cancer...
October 16, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/29045657/forecasting-spring-emergence-of-the-asian-corn-borer-ostrinia-furnacalis-lepidoptera-crambidae-based-on-postdiapause-development-rate
#8
Chang-Gyu Park, Bo Yoon Seo, Jin Kyo Jung, Hwang-Yong Kim, Si-Woo Lee, Ki Yeong Seong, Allan Showler
This study was conducted to develop temperature-dependent postdiapause development models of overwintering larvae of the Asian corn borer, Ostrinia furnacalis Guenée (Lepidoptera: Crambidae), and to evaluate the models' forecasting accuracy using spring adult emergence data. Overwintering larvae were collected at three different times: 24 February (first), 23 March (second), and 25 April (third), 2005. The developmental periods of each collection colony were measured at eight constant temperatures, and those developmental rates were modeled with linear and nonlinear regression...
October 16, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29045610/high-sensitivity-cardiac-troponin-i-and-risk-of-heart-failure-in-patients-with-suspected-acute-coronary-syndrome-a-cohort-study
#9
Dominik Stelzle, Anoop S V Shah, Atul Anand, Fiona E Strachan, Andrew R Chapman, Martin A Denvir, Nicholas L Mills, David A McAllister
Aims: Heart failure may occur following acute myocardial infarction, but with the use of high-sensitivity cardiac troponin assays we increasingly diagnose patients with minor myocardial injury. Whether troponin concentrations remain a useful predictor of heart failure in patients with acute coronary syndrome is uncertain. Methods and results: We identified all consecutive patients (n = 4748) with suspected acute coronary syndrome (61 ± 16 years, 57% male) presenting to three secondary and tertiary care hospitals...
July 19, 2017: European Heart Journal. Quality of Care & Clinical Outcomes
https://www.readbyqxmd.com/read/29045329/hybrid-deep-learning-on-single-wide-field-optical-coherence-tomography-scans-accurately-classifies-glaucoma-suspects
#10
Hassan Muhammad, Thomas J Fuchs, Nicole De Cuir, Carlos G De Moraes, Dana M Blumberg, Jeffrey M Liebmann, Robert Ritch, Donald C Hood
PURPOSE: Existing summary statistics based upon optical coherence tomographic (OCT) scans and/or visual fields (VFs) are suboptimal for distinguishing between healthy and glaucomatous eyes in the clinic. This study evaluates the extent to which a hybrid deep learning method (HDLM), combined with a single wide-field OCT protocol, can distinguish eyes previously classified as either healthy suspects or mild glaucoma. METHODS: In total, 102 eyes from 102 patients, with or suspected open-angle glaucoma, had previously been classified by 2 glaucoma experts as either glaucomatous (57 eyes) or healthy/suspects (45 eyes)...
October 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/29045322/longitudinal-associations-between-physical-activity-and-educational-outcomes
#11
Jaana T Kari, Jaakko Pehkonen, Nina Hutri-Kähönen, Olli T Raitakari, Tuija H Tammelin
PURPOSE: This longitudinal study examined the role of leisure-time physical activity in academic achievement at the end of compulsory basic education and educational attainment in adulthood. METHODS: The data were drawn from the ongoing longitudinal Cardiovascular Risk in Young Finns Study, which was combined with register-based data from Statistics Finland. The study consisted of children who were 12 yr (n = 1723, 49% boys) and 15 yr (n = 2445, 48% boys) of age at the time when physical activity was measured...
November 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29045312/validation-of-the-nonlaboratory-based-framingham-cardiovascular-disease-risk-assessment-algorithm-in-the-atherosclerosis-risk-in-communities-dataset
#12
Jacob K Kariuki, Eileen M Stuart-Shor, Suzanne G Leveille, Philimon Gona, Jerry Cromwell, Laura L Hayman
BACKGROUND: Nonlaboratory-based (non-LB) algorithms have been developed to facilitate absolute cardiovascular risk assessment in resource-constrained settings. The non-LB Framingham algorithm, which substitute BMI for lipids in laboratory-based Framingham, exhibits best performance among non-LB algorithms. However, its external validity has not been evaluated. AIM: To examine the validity of non-LB Framingham algorithm in Atherosclerosis Risk in Communities dataset, and contrast performance with the laboratory-based Framingham algorithm...
October 16, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/29045302/neurosteroid-levels-in-patients-with-bipolar-disorder-and-a-history-of-cannabis-use-disorders
#13
Brittany L Mason, Erin Van Enkevort, Francesca Filbey, Christine E Marx, John Park, Alyson Nakamura, Prabha Sunderajan, E Sherwood Brown
PURPOSE/BACKGROUND: In animal models, levels of the neurosteroid pregnenolone increase after tetrahydrocannabinol (THC) administration and pregnenolone appears to attenuate the brain effects of THC. Given these interactions between pregnenolone and THC, we evaluated baseline neurosteroid levels in participants with a history of a cannabis use disorders (CUDs). METHODS/PROCEDURES: Bipolar depressed participants were enrolled in a randomized placebo-controlled clinical trial to evaluate the efficacy of add-on pregnenolone for depression and before receiving pregnenolone or placebo...
October 17, 2017: Journal of Clinical Psychopharmacology
https://www.readbyqxmd.com/read/29044896/support-vector-machine-for-breast-cancer-classification-using-diffusion-weighted-mri-histogram-features-preliminary-study
#14
Igor Vidić, Liv Egnell, Neil P Jerome, Jose R Teruel, Torill E Sjøbakk, Agnes Østlie, Hans E Fjøsne, Tone F Bathen, Pål Erik Goa
BACKGROUND: Diffusion-weighted MRI (DWI) is currently one of the fastest developing MRI-based techniques in oncology. Histogram properties from model fitting of DWI are useful features for differentiation of lesions, and classification can potentially be improved by machine learning. PURPOSE: To evaluate classification of malignant and benign tumors and breast cancer subtypes using support vector machine (SVM). STUDY TYPE: Prospective. SUBJECTS: Fifty-one patients with benign (n = 23) and malignant (n = 28) breast tumors (26 ER+, whereof six were HER2+)...
October 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29044712/inferring-the-geographic-origin-of-a-range-expansion-latitudinal-and-longitudinal-coordinates-inferred-from-genomic-data-in-an-abc-framework-with-the-program-x-origin
#15
Qixin He, Joyce R Prado, L Lacey Knowles
Climatic or environmental change is not only driving distributional shifts in species today, but it has also caused distributions to expand and contract in the past. Inferences about the geographic locations of past populations, especially regions that served as refugia (i.e., source populations) and migratory routes are a challenging endeavor. Refugial areas may be evidenced from fossil records or regions of temporal stability inferred from ecological niche models. Genomic data offer an alternative and broadly applicable source of information about the locality of refugial areas, especially relative to fossil data, which are either unavailable or incomplete for most species...
October 16, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29044674/haem-is-associated-with-thrombosis-in-neonates-and-infants-undergoing-cardiac-surgery-for-congenital-heart-disease
#16
M Stolla, K Henrichs, J M Cholette, A P Pietropaoli, R P Phipps, S L Spinelli, N Blumberg
BACKGROUND: Haem levels are associated with thrombosis in a variety of diseases, as well as being a contributing cause of thrombotic events in animal models. MATERIALS AND METHODS: We retrospectively analyzed samples from 39 children who underwent cardiac surgery with cardiopulmonary bypass, including 15 children who developed a postoperative thrombosis and 24 controls. RESULTS: Patients who developed thrombosis postoperatively had statistically significant higher average haem levels over time (presurgery to 12 h postsurgery) compared to patients who did not develop thrombosis...
October 16, 2017: Vox Sanguinis
https://www.readbyqxmd.com/read/29044583/hierarchical-archimedean-copula-models-for-the-analysis-of-binary-familial-data
#17
Yihao Deng, N Rao Chaganty
Archimedean copulas are commonly used in a wide range of statistical models due to their simplicity, manageable analytical expressions, rich choices of generator functions, and other workable properties. However, the exchangeable dependence structure inherent to Archimedean copulas limits its application to familial data, where the dependence among family members is often different. When response variables are binary, modeling the familial associations becomes more challenging due to the stringent constraints imposed on the dependence parameters...
October 17, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/29044475/the-site-of-care-matters-an-examination-of-the-relationship-between-high-medicaid-burden-hospitals-and-the-use-cost-and-complications-of-immediate-breast-reconstruction-after-mastectomy
#18
Anaeze C Offodile, L Daniel Muldoon, Faiz Gani, Joseph K Canner, Lisa K Jacobs
BACKGROUND: Diminished use and worse outcomes after immediate breast reconstruction (IBR) have been documented for Medicaid beneficiaries. However, to the authors' knowledge, the contribution of patient clustering at hospitals with a high percentage of Medicaid patients to these inequalities in IBR delivery is unknown. METHODS: A cross-sectional analysis of patients undergoing IBR after mastectomy using the 2007 to 2011 Nationwide Inpatient Sample database was performed...
October 17, 2017: Cancer
https://www.readbyqxmd.com/read/29044273/doubling-the-power-of-dp4-for-computational-structure-elucidation
#19
K Ermanis, K E B Parkes, T Agback, J M Goodman
A large-scale optimisation of density functional theory (DFT) conditions for computational NMR structure elucidation has been conducted by systematically screening the DFT functionals and statistical models. The extended PyDP4 workflow was tested on a diverse and challenging set of 42 biologically active and stereochemically rich compounds, including highly flexible molecules. MMFF/mPW1PW91/M06-2X in combination with a 2 Gaussian, 1 region statistical model was capable of identifying the correct diastereomer among up to an upper limit of 32 potential diastereomers...
October 18, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29044152/a-machine-learning-assisted-label-free-non-invasive-approach-for-somatic-reprogramming-in-induced-pluripotent-stem-cell-colony-formation-detection-and-prediction
#20
Ke Fan, Sheng Zhang, Ying Zhang, Jun Lu, Mike Holcombe, Xiao Zhang
During cellular reprogramming, the mesenchymal-to-epithelial transition is accompanied by changes in morphology, which occur prior to iPSC colony formation. The current approach for detecting morphological changes associated with reprogramming purely relies on human experiences, which involve intensive amounts of upfront training, human error with limited quality control and batch-to-batch variations. Here, we report a time-lapse-based bright-field imaging analysis system that allows us to implement a label-free, non-invasive approach to measure morphological dynamics...
October 18, 2017: Scientific Reports
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