Search CORE

34 research outputs found

Automatic identification of variables in epidemiological datasets using logic regression

Author: Abdi N.A. (Negin Ashtiani)
Agewall Stefan
Amato M. (Mauro)
Bae J.-H. (Jang-Ho)
Baldassarre Damiano
Beloqui O. (Oscar)
Berenson G. (Gerald)
Bergstrom Goran
Bevc S. (Sebastjan)
Bickel Horst
Bokemark Lena
Bots Michiel
Bulbul Alpaslan
Castelnuovo S. (Samuela)
Catapano A. (Alberico)
Catapano Alberico
Chien K.-L. (Kuo-Liong)
Dekker Jacqueline
Desvarieux Moise
Dimitriadis C. (Chrystosomos)
Ducimetiere P.
Dörr Marcus
Ekart R. (Robert)
Empana Jean Philippe
Engström G.
Ezhov Marat
Franco Oscar
Frauchiger B. (Beat)
Friera Alfonsa
Gabriel R. (Rafael)
Grigore Liliana
Hedblad Bo
Hofman Albert
Hojs R. (Radovan)
Iglseder Bernhard
Ikram Arfan
Jovanovic A. (Aleksandar)
Kablak-Ziembicka A. (Anna)
Kato A. (Akihiko)
Kauhanen Jussi
Kavousi Maryam
Kiechl Stefan
Kitagawa K. (Kazuo)
Landecho M.F. (Manuel F.)
Lazarevic T. (Tatjana)
Lee M.-S. (Moo-Sik)
Lin H.-J. (Hung-Ju)
Lind Lars
Liu J. (Jing)
Lorenz Matthias W.
McLachlan Stela
Nijpels Giel
Norata Giuseppe
Okazaki S. (Shuhei)
Orth A. (Andreas)
Papagianni Aikaterini
Park H.W. (Hyun Woong)
Pflug Anja
Plichart Matthieu
Polak Joseph F.
Poppert Holger
Price J.F. (Jackie F.)
Przewlocki T. (Tadeusz)
Robertson Christine M
Ronkainen Kimmo
Rosvall Maria
Rundek Tatjana
Sacco R.L. (Ralph L.)
Sander D. (Dirk)
Scheckenbach Frank
Schmidt Caroline
Schminke Ulf
Sirtori C.R. (Cesare R.)
Sitzer Matthias
Srinivasan S.R. (Sathanur R.)
Staub D. (Daniel)
Stehouwer Coen
Steinmetz helmuth
Stolic R. (Radojica)
Su T.-C. (Ta-Chen)
Suarez C. (Carmen)
Tremoli Elena
Tripepi Giovanni
Tuomainen T.-P. (Tomi-Pekka)
Uthoff H. (Heiko)
Veglia Fabrizio
Völzke Henry
Willeit Johann
Willeit Johann
Xie Wuxiang
Yanez D.N. (David N.)
Zhao D. (Dong)
Zoccali Carmine
Publication venue: 'Springer Science and Business Media LLC'
Publication date: 01/01/2017
Field of study

textabstractBackground: For an individual participant data (IPD) meta-analysis, multiple datasets must be transformed in a consistent format, e.g. using uniform variable names. When large numbers of datasets have to be processed, this can be a time-consuming and error-prone task. Automated or semi-automated identification of variables can help to reduce the workload and improve the data quality. For semi-automation high sensitivity in the recognition of matching variables is particularly important, because it allows creating software which for a target variable presents a choice of source variables, from which a user can choose the matching one, with only low risk of having missed a correct source variable. Methods: For each variable in a set of target variables, a number of simple rules were manually created. With logic regression, an optimal Boolean combination of these rules was searched for every target variable, using a random subset of a large database of epidemiological and clinical cohort data (construction subset). In a second subset of this database (validation subset), this optimal combination rules were validated. Results: In the construction sample, 41 target variables were allocated on average with a positive predictive value (PPV) of 34%, and a negative predictive value (NPV) of 95%. In the validation sample, PPV was 33%, whereas NPV remained at 94%. In the construction sample, PPV was 50% or less in 63% of all variables, in the validation sample in 71% of all variables. Conclusions: We demonstrated that the application of logic regression in a complex data management task in large epidemiological IPD meta-analyses is feasible. However, the performance of the algorithm is poor, which may require backup strategies

Directory of Open Access Journals

Edinburgh Research Explorer

University of Miami: Scholarship Miami

Erasmus University Digital Repository

NORA - Norwegian Open Research Archives

espace@Curtin

Crossref

AIR Universita degli studi di Milano

PubMed Central

EUR Research Repository

Utrecht University Repository

Leicester Research Archive

Roses: buying and planting

Author: Tripepi Robert R.
Publication venue: University of Idaho. Agricultural Extension Service
Publication date: 01/02/1987
Field of study

3 p.: ill.; 28 cm

University of Idaho Library Digital Initiatives

Idaho Master Gardener Program Handook, 14th edition

Author: Tripepi Robert R.
Publication venue: University of Idaho. Extension
Publication date: 01/01/2012
Field of study

Gardeners throughout Idaho use this basic gardening handbook as their text in the increasingly popular Master Gardener classes. The 24 how-to chapters cover everything from soil fertility to insect management. Gardeners use the large three-ring notebook to add specialized and localized information

University of Idaho Library Digital Initiatives

Pruning landscape trees and shrubs

Author: Tripepi Robert R.
Publication venue: University of Idaho. Agricultural Extension Service
Publication date: 01/09/1985
Field of study

6 p.: ill.; 28 cm

University of Idaho Library Digital Initiatives

Idaho Master Gardener Program Handbook, 13th edition

Author: Tripepi Robert R.
Publication venue: University of Idaho. Extension
Publication date: 01/01/2011
Field of study

Gardeners throughout Idaho use this basic gardening handbook as their text in the popular Master Gardener classes. The 24 how-to chapters cover everything from soil fertility to insect management. Gardeners use the large three-ring notebook to add specialized and localized information

University of Idaho Library Digital Initiatives

Idaho Master Gardener Program Handook, 16th edition

Author: Tripepi Robert R.
Publication venue: University of Idaho. Extension
Publication date: 01/01/2014
Field of study

University of Idaho Library Digital Initiatives

PHYSIOLOGICAL RESPONSE OF MAPLE AND BIRCH ROOTS TO RHIZOSPHERE HYPOXIA

Author: TRIPEPI ROBERT ROCCO
Publication venue: 'Purdue University (bepress)'
Publication date: 01/01/1984
Field of study

The purpose of this study was to determine if internal aeration of roots by lower stems, changes in gross morphology of lower stems, or both, contribute to flood tolerance of certain tree species. Greenhouse-grown seedlings of red maple (Acer rubrum L.) and river birch (Betula nigra L.) tolerated at least 30 days of flooding, whereas sugar maple (Acer saccharum Marsh) and European birch (Betula pendula Roth) were intolerant. Flood treatment induced lenticel intumescences and adventitious root formation on red maple stems, but only adventitious roots formed on river birch stems. Stem morphology of sugar maple and European birch was unchanged by flooding. Flood stress decreased oxygen consumption capacity of excised roots from both tolerant and intolerant species. Exclusion of oxygen from the lower stems of red maple and river birch prevented lenticel intumescence and adventitious root formation, but flood tolerance and root respiration capacity were unchanged. Neither internal aeration nor changes in stem morphology appear to account for flood tolerance of red maple and river birch. In the second part of this study, several biochemical and physiological responses of river and European birch roots to hypoxia were compared in order to determine root metabolic activity under low oxygen tension. Although hypoxia decreased total adenosine phosphate and adenosine triphosphate contents in roots from both species, river birch roots contained greater quantities of these nucleotides after 18 days of treatment. Adenylate energy charge of river birch roots decreased between 6 and 12 days of hypoxia, whereas energy charge of European birch roots decreased significantly after only one day. In vitro activity of cytochrome c oxidase and oxygen consumption capacity of excised roots from both birch species decreased under hypoxia. In vitro activity of alcohol dehydrogenase from roots of both species increased after 1 day of hypoxia. However, alcohol dehydrogenase activity from river birch roots increased 25 fold by 6 days of hypoxia, whereas that in European birch roots decreased back to control levels. Metabolic adaptation within the root, rather than internal aeration, appears to be responsible for tolerance of river birch to hypoxia

Purdue E-Pubs

Metabolic Response of River Birch and European Birch and European Birch Roots to Hypoxia

Author: Cary A. Mitchell
Robert R. Tripepi
Publication venue: 'American Society of Plant Biologists (ASPB)'
Publication date
Field of study

Crossref

Assays for the in vitro establishment of Swietenia macrophylla and Cedrela odorata

Author: Julián Pérez Flores
María Elena Aguilar Vega
Robert Roca Tripepi
Publication venue: Universidad Nacional de Colombia
Publication date: 01/01/2012
Field of study

Título en español: Ensayos para el establecimiento in vitro de Swietenia macrophylla y Cedrela odorata Abstract: Recalcitrance and contamination in Mahogany (Swietenia macrophylla King) and Spanish cedar (Cedrela odorata L.) stem tissues are the main causes of its ineffective in vitro propagation. The objectives of this research were: a) to evaluate sodium hypochlorite (NaOCl) and plant preservative mixture (PPM®) as surface disinfectants and/or added to the culture medium for the in vitro establishment of nodal explants taken from 10-year-old Mahogany and Spanish cedar plants, and b) to evaluate the in vitro response of such explants treated with N6-benzylaminopurine (BAP) (0, 2.2, 4.4, 8.8, 17.7 μM), silver nitrate (AgNO3) (0, 3 mg l-1), activated charcoal (0, 1 g l-1) and vented caps. All the experiments were arranged in a completely randomized design. The NaOCl at 15%, for 20 min, as a surface sterilization or PPM® at 2 ml l-1 i

LAReferencia - Red Federada de Repositorios Institucionales de Publicaciones Científicas Latinoamericanas

Directory of Open Access Journals

DIALNET

Universidad Nacional De Colombia - Repositorio Institucional UN