Search results for "Biome"
showing 10 items of 4164 documents
Towards a framework for assessment and management of cumulative human impacts on marine food webs
2015
Effective ecosystem-based management requires understanding ecosystem responses to multiple human threats, rather than focusing on single threats. To understand ecosystem responses to anthropogenic threats holistically, it is necessary to know how threats affect different components within ecosystems and ultimately alter ecosystem functioning. We used a case study of a Mediterranean seagrass (Posidonia oceanica) food web and expert knowledge elicitation in an application of the initial steps of a framework for assessment of cumulative human impacts on food webs. We produced a conceptual seagrass food web model, determined the main trophic relationships, identified the main threats to the fo…
Delfiinipotkun syklimuuttujien erot vapaauinnin ja selkäuinnin startin ja seinästä ponnistuksen jälkeen
2017
Kilpauinnissa, kuten muissakin urheilulajeissa suoritusten analysointi on tärkeässä roolissa urheilijan kehityksessä. 1980 Olympialaisissa selkäuimarit alkoivat tehdä pidempiä vedenalaisia delfiinipotkuja ja huomattiin että nämä uimarit olivat nopeampia. Tämän tutkimuksen tarkoituksena oli selvittää delfiinipotkuun vaikuttavia biomekaanisia tekijöitä ja niiden eroja selällään ja vatsallaan tehtyinä startin ja ponnistuksen jälkeen. Yhdeksän nuorta mieskilpauimaria osallistui tutkimukseen (ikä: 17,56 ± 1,24 v, pituus: 182,11 ± 6,75 cm, paino: 74,54 ± 7,01 kg). Maksimaalisia delfiinipotkuja tehtiin 15 metriä neljällä eri tyylillä: vapaauinninstartista (vust), vapaauinnin / vatsalleen ponnistuk…
SingleChannelNet : A model for automatic sleep stage classification with raw single-channel EEG
2022
In diagnosing sleep disorders, sleep stage classification is a very essential yet time-consuming process. Various existing state-of-the-art approaches rely on hand-crafted features and multi-modality polysomnography (PSG) data, where prior knowledge is compulsory and high computation cost can be expected. Besides, it is a big challenge to handle the task with raw single-channel electroencephalogram (EEG). To overcome these shortcomings, this paper proposes an end-to-end framework with a deep neural network, namely SingleChannelNet, for automatic sleep stage classification based on raw single-channel EEG. The proposed model utilizes a 90s epoch as the textual input and employs two multi-conv…
Voimaharjoittelun vaikutukset keskimmäisen ja suoran reisilihaksen väliseen dynamiikkaan polven koukistus-ojennusliikkeessä
2014
Tässä tutkimuksessa tarkastellaan nopeuskoodatun magneettikuvauksen avulla voimaharjoittelun vaikutuksia nelipäisen reisilihaksen mekaniikkaan. Tutkimukseen osallistui 14 koehenkilöä, joista seitsemän voimaharjoitteli 20 viikon ajan. Yhden toiston maksimitulos jalkakyykyssä parani koeryhmällä (33,1 ± 12,1) % ja vertailuryhmällä (6,6 ± 5,1) %. Molemmat tulokset olivat tilastollisesti merkitseviä (koeryhmä 𝑝 < 0.001, vertailuryhmä 𝑝 < 0.05). Ryhmän ja ajan yhteisvaikutus oli merkitsevä (𝑝 < 0.001). Voimaharjoittelujaksoa ennen ja sen jälkeen koehenkilöt tekivät pienellä kuormalla toistuvaa polven ojennus-koukistusliikettä magneettikuvauslaitteessa. Suoran reisilihaksen ja keskimmäisen reis…
Physiological parameters measurements in a cardiac cycle via a combo PPG-ECG system
2015
In this paper, we present an innovative way to measure some physiological parameters (such as the pre-ejection period, the pulse transit time, the blood pressure) in a cardiac cycle. A combo PPG-ECG system has been developed and employed to extract both the ECG signal from standard limb leads and simultaneously the photoplethysmography signal from the wrist and the forearm, to calculate the pre-ejection period. This system represents an easy and non-invasive technique to determine these biomedical parameters without using expensive impedance cardiography equipment.
Changes in biomechanics of skiing at maximal velocity caused by simulated 20 km skiing race using V2 skating technique
2018
This study investigated how the fatigue caused by a 20-km simulated skating cross-country skiing race on snow affects the final spurt performance from a biomechanical perspective. Subjects performed a 100-m maximal skiing trial before and at the end of the simulated race. Cycle characteristics, ground reaction forces from skis and poles, and muscle activity from eight muscles were recorded during each trial. Results showed that subjects were in a fatigued state after the simulated race manifested by 11.6% lower skiing speed (P<.01). The lower skiing speed was related to an 8.0% decrease in cycle rate (P<.01), whereas cycle length was slightly decreased (tendency). In temporal patterns, rela…
Connecting others: Does a tertius iungens orientation shape the relationship between research networks and innovation?
2021
Research on social networks and innovation emphasizes that individuals spanning structural holes and crossing institutional boundaries have more opportunities for knowledge recombination and innovation involvement. However, transforming the potential knowledge and resources available through personal networks to attain innovation can be difficult for the focal individual. Using an ego-network approach, this study examines whether and to what extent an individual strategic orientation to cooperation (i.e. tertius iungens) contributes to strengthening the relation between two personal network properties (structural and institutional separation) and involvement in innovation. Our analysis is c…
Analysis of Exosomal Cargo Provides Accurate Clinical, Histologic and Mutational Information in Non-Small Cell Lung Cancer
2022
Simple Summary Non-small cell lung cancer (NSCLC) is the second most commonly diagnosed cancer and the leading cause of cancer-related death worldwide. Clinical decision-making depends on the histological classification; however, tissue biopsy is frequently not technically feasible due to tumor location or limited tissue samples. Therefore, we propose to find clinical, molecular and histological biomarkers using a minimally invasive approach based on the analysis of the cargo of the blood extracellular vesicles. Exosomes are membranous vesicles present in several biological fluids, which carry biological information to distant tissues, regulating several tumor processes. This study aims to …
Understanding the microbial biogeography of ancient human dentitions to guide study design and interpretation
2021
AbstractThe oral cavity is a heterogeneous environment, varying in factors such as pH, oxygen levels, and salivary flow. These factors affect the microbial community composition and distribution of species in dental plaque, but it is not known how well these patterns are reflected in archaeological dental calculus. In most archaeological studies, a single sample of dental calculus is studied per individual and is assumed to represent the entire oral cavity. However, it is not known if this sampling strategy introduces biases into studies of the ancient oral microbiome. Here, we present the results of a shotgun metagenomic study of a dense sampling of dental calculus from four Chalcolithic i…
Darba stress un biomehāniskie riska faktori profesionālajā sportā, to samazināšanas iespējas
2017
„Darba stress un biomehāniskie riska faktori profesionālajā sportā, to samazināšanas iespējas”. Darba autore: Ieva Tetere. Zinātniskais vadītājs: Dr.sc.admin., asoc.prof. H. Kaļķis. Darba apjoms ir 98 lpp., tajā ietvertas 10 tabulas, 36 attēli, 5 pielikumi un 34 literatūras avoti. Darba stresa un biomehānisko riska faktoru ietekmē profesionālie sportisti var izjust psiholoģiska rakstura diskomfortu un tikt pakļauti augstam sporta traumatisma riskam, bet Latvijā no darba aizsardzības aspekta tā ir maz pētīta tematika. Darbs sastāv no 4 daļām, kuru ietvaros veikta literatūras izpēte, izvēlēto metožu raksturojums, iegūto rezultātu analīze, izstrādāti priekšlikumi un aizsardzības pasākumi. Maģi…