Stefan Hey

ORCID: 0000-0002-0416-8893
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About
Contact & Profiles
Research Areas
  • Physical Activity and Health
  • Non-Invasive Vital Sign Monitoring
  • Glaucoma and retinal disorders
  • Plant Molecular Biology Research
  • Behavioral Health and Interventions
  • Cardiovascular and exercise physiology
  • Plant Reproductive Biology
  • Optical Imaging and Spectroscopy Techniques
  • Context-Aware Activity Recognition Systems
  • Data Visualization and Analytics
  • Eating Disorders and Behaviors
  • Healthcare Technology and Patient Monitoring
  • Psychology, Coaching, and Therapy
  • Corneal surgery and disorders
  • Genetics and Plant Breeding
  • Smart Agriculture and AI
  • Topological and Geometric Data Analysis
  • EEG and Brain-Computer Interfaces
  • Cell Image Analysis Techniques
  • Genetic Mapping and Diversity in Plants and Animals
  • Epilepsy research and treatment
  • Heart Rate Variability and Autonomic Control
  • Plant tissue culture and regeneration
  • Mental Health Research Topics
  • Leaf Properties and Growth Measurement

Iowa State University
2017-2021

University of Bonn
2015-2019

Karlsruhe Institute of Technology
2009-2015

Institut für Informationsverarbeitung
2002-2014

Karlsruhe University of Education
1999-2002

Summary Flowering time is a major determinant of the local adaptation plants. Although numerous loci affecting flowering have been mapped in maize, their underlying molecular mechanisms and roles remain largely unknown. Here, we report identification characterization MADS ‐box transcription factor Zm 69 that functions as activator through ZmRap2.7‐ ZCN 8 regulatory module contributes to adaptation. We show underlies quantitative trait locus controlling difference between maize its wild...

10.1111/nph.15512 article EN New Phytologist 2018-10-06

Determining the genetic control of root system architecture (RSA) in plants via large-scale genome-wide association study (GWAS) requires high-throughput pipelines for phenotyping. We developed Core Root Excavation using Compressed-air (CREAMD), a pipeline cleaning field-grown roots, and Feature Extraction (COFE), semiautomated extraction RSA traits from images. CREAMD-COFE was applied to diversity panels maize (Zea mays) sorghum (Sorghum bicolor), which consisted 369 294 genotypes,...

10.1104/pp.19.00752 article EN PLANT PHYSIOLOGY 2019-11-18

Only little is known about target genes of auxin signalling downstream the Aux/IAA-ARF module. In present study, it has been demonstrated that maize lateral root primordia 1 (lrp1) encodes a transcriptional activator directly regulated by Aux/IAA protein ROOTLESS WITH UNDETECTABLE MERISTEM (RUM1). Expression lrp1 confined to early and meristems auxin-inducible. Based on its primary structure, LRP1 predicted be transcription factor. This notion supported exclusive localization in nucleus...

10.1093/jxb/erv187 article EN Journal of Experimental Botany 2015-04-23

Regularly conducted exercise programs effectively influence affective states. Studies suggest that this is also true for short bouts of physical activity (PA) 10 min or less. Accordingly, everyday life activities duration might be used to regulate However, association has rarely been studied in reference unstructured ongoing real-life situations. The current study examined the various on three dimensions mood (valence, calmness, energetic arousal) a predominantly inactive sample. Ambulatory...

10.3389/fpsyg.2013.00102 article EN cc-by Frontiers in Psychology 2013-01-01

Limitations in physical activity are considered as a key problem patients with multiple sclerosis (PwMS). Contemporary methods to assess the level of PwMS regular clinical observation. However, these either rely on high recall and accurate reporting from (e.g. self-report questionnaires), or they conducted during particular assessment predefined activities. Therefore, main aim this pilot study was develop an objective method gather information about real type intensity daily activities...

10.1186/1475-925x-13-10 article EN cc-by BioMedical Engineering OnLine 2014-01-01

Abstract Root hairs are tubular extensions of the epidermis. monogenic recessive maize mutant roothairless 6 (rth6 ) arrested after bulge formation during transition to tip growth and display a rough cell surface. BSR-Seq in combination with Seq-walking subsequent analyses four independently generated alleles established that rth6 encodes CSLD5 plasma membrane localized 129 kD D-type cellulose synthase eight transmembrane domains. Cellulose synthases required for biosynthesis cellulose, most...

10.1038/srep34395 article EN cc-by Scientific Reports 2016-10-06

Acute and regular exercise as well physical activity (PA) is related to well-being positive affect. Recent studies have shown that even daily, unstructured activities increase However, the attempt achieve adherence PA or in inactive people through public health interventions has often been unsuccessful. Most analyzing activity-affect association daily life, did not report participants' habitual behavior. Thus, samples included active people, but they necessarily exhibit same affective...

10.3389/fpsyg.2013.00163 article EN cc-by Frontiers in Psychology 2013-01-01

Regular exercise and physical activity are among the most important factors influencing quality of life make a significant contribution to maintenance health well-being. The assessment via accelerometry has become promising technique often used as means objectively measure activity. This work proposes simple reliable method assess human calculate energy expenditure (EE) by using an acceleration air pressure sensor. Our proposed algorithm differentiates between 7 activities with average...

10.1109/embc.2012.6347471 article EN Annual International Conference of the IEEE Engineering in Medicine and Biology Society 2012-08-01

Stress is one of the most common reasons for a number serious diseases. For prevention and treatment stress, psycho-physiological monitoring system stress measurement needed. Because multifarious influences on physiological response body, has to take into account as many parameters possible. The pulse transit time (PTT), which determined by measuring ECG wave at example finger, gives comprehensive information about cardiovascular system. In study we investigate correlation between PTT...

10.1109/etelemed.2009.35 article EN International Conference on eHealth, Telemedicine, and Social Medicine 2009-02-01

ORIGINAL RESEARCH article Front. Psychol., 09 July 2013Sec. Movement Science and Sport Psychology https://doi.org/10.3389/fpsyg.2013.00411

10.3389/fpsyg.2013.00411 article EN cc-by Frontiers in Psychology 2013-01-01

The maize (Zea mays L.) Aux/IAA protein RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEM 1) is a key regulator of lateral and seminal root formation. An ancient genome duplication resulted in the emergence its homeolog rum1-like1 (rul1), which displays 92% amino acid sequence identity with RUM1. Both, RUL1 exhibit canonical four domain structure proteins. Moreover, both are localized to nucleus, instable have similar short half-lives ~23min. can be stabilized by specific mutations five degron II....

10.1093/jxb/erv519 article EN cc-by Journal of Experimental Botany 2015-12-15

Root hairs are tubular extensions of epidermis cells. Transcriptome profiling demonstrated that the single cell-type root hair transcriptome was less complex than multiple primary roots without hairs. In total, 831 genes were exclusively and 5585 preferentially expressed in [false discovery rate (FDR) ≤1%]. Among those, most significantly enriched Gene Ontology (GO) functional terms related to energy metabolism, highlighting high demand for development function Subsequently, maize homologs...

10.1093/jxb/erx104 article EN cc-by Journal of Experimental Botany 2017-03-08

Assessing people's everyday life physical activity by accelerometry has gained a large role in the medical, sports and psychology science research recent years. Walking is most common walking speed can be used as an indicator for human profile. Energy expenditure on other hand often dimension while assessing strongly related to speed. We propose algorithm, which predicts gait based body accelerations measured right side hip tri-axial accelerometer. Based classified energy estimated. After...

10.1109/bsn.2012.7 article EN 2012-05-01

Abstract Bluetooth Low Energy (BLE) has reduced the energy consumption for sensor nodes drastically. One major reason this improvement is a non-continuous connection between nodes. But causes also nondeterministic data transmission time. Most synchronization protocols are influenced by characteristic, with result of less accuracy. In wireless body networks accuracy often vital importance. Therefore paper evaluates different principles customized BLE. For evaluation measurements we used two...

10.1515/cdbme-2015-0019 article EN cc-by-nc-nd Current Directions in Biomedical Engineering 2015-09-01

Mobile health (mHealth) could be widely used in the population to improve access psychological treatment. In this paper, we describe development of a mHealth intervention on basis supportive self-monitoring and protocol for randomized controlled trial evaluate its effectiveness among smartphone users with distress. Based power analysis, representative quota sample N=186 will recruited, an over-sampling persons moderate high Over 4-week period, compared without group passive control group....

10.3389/fpubh.2017.00249 article EN cc-by Frontiers in Public Health 2017-09-21

Seed longevity is one of the most essential characteristics seed quality. Two chromosome segment substitution lines, I178 and X178, which show significant differences in longevity, were subjected to transcriptome sequencing before after five days accelerated aging (AA) treatments. Compared non-aging treatment, 286 220 differentially expressed genes (DEGs) identified 5 treatment respectively. Of these DEGs, 98 detected both enriched Gene Ontology (GO) terms cellular component nuclear part,...

10.1371/journal.pone.0216977 article EN cc-by PLoS ONE 2019-11-11

Abstract Pentatricopeptide repeat (PPR) proteins involved in mitochondrial RNA cytidine (C)-to-uridine (U) editing mostly result stagnant embryo and endosperm development upon loss of function. However, less is known about PPRs that are farinaceous formation maize quality. Here, we cloned a DYW-type PPR Defective Kernel605 (Dek605). Mutation Dek605 delayed seed seedling development. Mitochondrial transcript analysis dek605 revealed DEK605 impaired C-to-U at the nad1-608 site fails to alter...

10.1093/pcp/pcaa110 article EN Plant and Cell Physiology 2020-08-14

Phenomics is an emerging branch of modern biology that uses high throughput phenotyping tools to capture multiple environmental and phenotypic traits, often at massive spatial temporal scales. The resulting dimensional data represent a treasure trove information for providing in-depth understanding how factors interact contribute the overall growth behavior different genotypes. However, computational can parse through such complex aid in extracting plausible hypotheses are currently lacking....

10.1109/tcbb.2019.2947500 article EN cc-by IEEE/ACM Transactions on Computational Biology and Bioinformatics 2019-10-23

High-throughput phenotyping enables the efficient collection of plant trait data at scale. One example involves using imaging systems over key phases a crop growing season. Although resulting images provide rich for statistical analyses phenotypes, image processing extraction is required as prerequisite. Current methods are mainly based on supervised learning with human labeled or semisupervised mixture and unsupervised data. Unfortunately, preparing sufficiently large training both time...

10.34133/2021/9805489 article EN cc-by Plant Phenomics 2021-01-01

Operating at lower frequencies than systems such as Wi-Fi, TVWS wireless communication can enable long-range in rural communities and more easily penetrate obstacles (vegetation, terrains). Thus, it is appealing to scenarios where line-of-sight not always guaranteed. In particular, a good candidate for supporting precision agriculture camera-based plant phenotyping sensor-based analysis of behaviour. Yet there lacks in-depth real-world measurement data on the behavior channels farms. To fill...

10.1109/mass52906.2021.00051 article EN 2022 IEEE 19th International Conference on Mobile Ad Hoc and Smart Systems (MASS) 2021-10-01

In order to investigate the correlation between stress and cognitive performance, a mobile Body & Mind Monitoring System was implemented. This system has modular design contains different modules allowing long time noninvasive monitoring of physiological parameters test person in his every day life, for instance ECG, GSR, PPG, respiration physical activity. The functionality created set-up validated clinical studies can now be conducted.

10.1109/issmdbs.2008.4575024 article EN 2008-01-01

In den vergangenen Jahren ist die Notwendigkeit, körperliche Aktivität objektiv zu erfassen, deutlich geworden, da diese bei einer Reihe der bedeutendsten Volkskrankheiten eine entscheidende Rolle für Entstehung sowie Therapie spielt. Aktivitätsmonitore, auf Beschleunigungssensoren basieren und verschiedene Parameter erfassen können, haben sich in letzten zum Standardinstrument objektiven Messung körperlichen entwickelt. Der grundlegende zur Beurteilung dabei Energieumsatz. Die derzeit...

10.1055/s-0033-1361577 article DE B&G Bewegungstherapie und Gesundheitssport 2014-04-17
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