PeerJ
type: channel
link: https://peerj.com/articles/
description: Articles published in PeerJ
publisher: PeerJ Inc.
publication name: PeerJ
issn: 2167-8359
items: Orbicularis oculi muscle activity during computer reading under different degrees of artificially-induced aniseikonia
items: Bacteriogenic synthesis of morphologically diverse silver nanoparticles and their assessment for methyl orange dye removal and antimicrobial activity
items: Leeches Baicalobdella torquata feed on hemolymph but have a low effect on the cellular immune response of amphipod Eulimnogammarus verrucosus from Lake Baikal
items: Comparing trophic position estimates using bulk and compound specific stable isotope analyses: applying new approaches to mackerel icefish Champsocephalus gunnari
items: Occurrence patterns of sympatric forest wallabies: assessing the influence of structural habitat attributes on the coexistence of Thylogale thetis and T. stigmatica
items: Validity and reliability of My Jump 2® app to measure the vertical jump on elite women beach volleyball players
items: Seasonal occurrence and individual variability of bull sharks, Carcharhinus leucas, in a marine reserve of the southwestern Gulf of California
items: Balance performance, falls-efficacy and social participation in patients with type 2 diabetes mellitus with and without vestibular dysfunction
items: Environmental awareness and sustainable consumption behaviours of Turkish nursing students
items: Effects of extreme meteorological factors and high air pollutant concentrations on the incidence of hand, foot and mouth disease in Jining, China

Orbicularis oculi muscle activity during computer reading under different degrees of artificially-induced aniseikonia
type: item
type: AcademicArticle
description: Background Aniseikonia is a binocular vision disorder that has been associated with asthenopic symptoms. However, asthenopia has been evaluated with subjective tests that make difficult to determine the level of aniseikonia. This study aims to objectively evaluate the impact of induced aniseikonia at different levels on visual fatigue by measuring the orbicularis oculi muscle activity in the dominant and non-dominant eyes while performing a reading task. Methods Twenty-four collegiate students (24.00 ± 3.86 years) participated in this study. Participants read a passage for 7 minutes under four degrees of aniseikonia (0%, 3%, 5% and 10%) at 50 cm. Orbicularis oculi muscle activity of the dominant and non-dominant eye was recorded by surface electromyography. In addition, visual discomfort was assessed after each task by completing a questionnaire. Results Orbicularis oculi muscle activity increased under induced aniseikonia (i.e., greater values for the 10% condition in comparison to 0%, and 3% conditions (p = 0.034 and p = 0.023, respectively)). No statistically significant differences were observed in orbicularis oculi muscle activity for the time on task and between the dominant and non-dominant eyes. Additionally, higher levels of subjective visual discomfort were observed for lower degrees of induced aniseikonia. Conclusion Induced aniseikonia increases visual fatigue at high aniseikonia degrees as measured by the orbicularis oculi muscle activity, and at low degrees as measured with subjective questionnaires. These findings may be of relevance to better understand the visual symptomatology of aniseikonia.
format: application/pdf
format: text/html
creator: Beatriz Redondo
creator: Jesus Vera
creator: Rubén Molina
creator: Alejandro Molina-Molina
creator: Raimundo Jiménez
subject: Ophthalmology
subject: Psychiatry and Psychology
description: doi:10.7717/peerj.17293
publisher: PeerJ Inc.
rights: © 2024 Redondo et al.
abstract: Background Aniseikonia is a binocular vision disorder that has been associated with asthenopic symptoms. However, asthenopia has been evaluated with subjective tests that make difficult to determine the level of aniseikonia. This study aims to objectively evaluate the impact of induced aniseikonia at different levels on visual fatigue by measuring the orbicularis oculi muscle activity in the dominant and non-dominant eyes while performing a reading task. Methods Twenty-four collegiate students (24.00 ± 3.86 years) participated in this study. Participants read a passage for 7 minutes under four degrees of aniseikonia (0%, 3%, 5% and 10%) at 50 cm. Orbicularis oculi muscle activity of the dominant and non-dominant eye was recorded by surface electromyography. In addition, visual discomfort was assessed after each task by completing a questionnaire. Results Orbicularis oculi muscle activity increased under induced aniseikonia (i.e., greater values for the 10% condition in comparison to 0%, and 3% conditions (p = 0.034 and p = 0.023, respectively)). No statistically significant differences were observed in orbicularis oculi muscle activity for the time on task and between the dominant and non-dominant eyes. Additionally, higher levels of subjective visual discomfort were observed for lower degrees of induced aniseikonia. Conclusion Induced aniseikonia increases visual fatigue at high aniseikonia degrees as measured by the orbicularis oculi muscle activity, and at low degrees as measured with subjective questionnaires. These findings may be of relevance to better understand the visual symptomatology of aniseikonia.
bibliographic citation: Redondo et al. (2024) Orbicularis oculi muscle activity during computer reading under different degrees of artificially-induced aniseikonia. PeerJ 12:e17293 https://doi.org/10.7717/peerj.17293
date submitted: 2023-12-02
date accepted: 2024-04-02
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Redondo
  given name: Beatriz
author list: Agent
  family name: Vera
  given name: Jesus
author list: Agent
  family name: Molina
  given name: Rubén
author list: Agent
  family name: Molina-Molina
  given name: Alejandro
author list: Agent
  family name: Jiménez
  given name: Raimundo
doi: 10.7717/peerj.17293
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: ©2024 Redondo et al.
attribution name: Redondo et al.

Bacteriogenic synthesis of morphologically diverse silver nanoparticles and their assessment for methyl orange dye removal and antimicrobial activity
type: item
type: AcademicArticle
description: Nanotechnology and nanoparticles have gained massive attention in the scientific community in recent years due to their valuable properties. Among various AgNPs synthesis methods, microbial approaches offer distinct advantages in terms of cost-effectiveness, biocompatibility, and eco-friendliness. In the present research work, investigators have synthesized three different types of silver nanoparticles (AgNPs), namely AgNPs-K, AgNPs-M, and AgNPs-E, by using Klebsiella pneumoniae (MBC34), Micrococcus luteus (MBC23), and Enterobacter aerogenes (MBX6), respectively. The morphological, chemical, and elemental features of the synthesized AgNPs were analyzed by using UV-Vis spectroscopy (UV-Vis), Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy-dispersive spectroscopy (EDX). UV-Vis absorbance peaks were obtained at 475, 428, and 503 nm for AgNPs-K, AgNPs-M, and AgNPs-E, respectively. The XRD analysis confirmed the crystalline nature of the synthesized AgNPs, having peaks at 26.2°, 32.1°, and 47.2°. At the same time, the FTIR showed bands at 599, 963, 1,693, 2,299, 2,891, and 3,780 cm−1 for all the types of AgNPs indicating the presence of bacterial biomolecules with the developed AgNPs. The size and morphology of the AgNPs varied from 10 nm to several microns and exhibited spherical to porous sheets-like structures. The percentage of Ag varied from 37.8% (wt.%) to 61.6%, i.e., highest in AgNPs-K and lowest in AgNPs-M. Furthermore, the synthesized AgNPs exhibited potential for environmental remediation, with AgNPs-M exhibiting the highest removal efficiency (19.24% at 120 min) for methyl orange dye in simulated wastewater. Further, all three types of AgNPs were evaluated for the removal of methyl orange dye from the simulated wastewater, where the highest dye removal percentage was 19.24% at 120 min by AgNPs-M. Antibacterial potential of the synthesized AgNPs assessment against both Gram…
format: application/pdf
format: text/html
creator: Bhakti Patel
creator: Virendra Kumar Yadav
creator: Reema Desai
creator: Shreya Patel
creator: Abdelfattah Amari
creator: Nisha Choudhary
creator: Haitham Osman
creator: Rajat Patel
creator: Deepak Balram
creator: Kuang-Yow Lian
creator: Dipak Kumar Sahoo
creator: Ashish Patel
subject: Biochemistry
subject: Microbiology
subject: Soil Science
subject: Environmental Contamination and Remediation
description: doi:10.7717/peerj.17328
publisher: PeerJ Inc.
rights: © 2024 Patel et al.
abstract: Nanotechnology and nanoparticles have gained massive attention in the scientific community in recent years due to their valuable properties. Among various AgNPs synthesis methods, microbial approaches offer distinct advantages in terms of cost-effectiveness, biocompatibility, and eco-friendliness. In the present research work, investigators have synthesized three different types of silver nanoparticles (AgNPs), namely AgNPs-K, AgNPs-M, and AgNPs-E, by using Klebsiella pneumoniae (MBC34), Micrococcus luteus (MBC23), and Enterobacter aerogenes (MBX6), respectively. The morphological, chemical, and elemental features of the synthesized AgNPs were analyzed by using UV-Vis spectroscopy (UV-Vis), Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy-dispersive spectroscopy (EDX). UV-Vis absorbance peaks were obtained at 475, 428, and 503 nm for AgNPs-K, AgNPs-M, and AgNPs-E, respectively. The XRD analysis confirmed the crystalline nature of the synthesized AgNPs, having peaks at 26.2°, 32.1°, and 47.2°. At the same time, the FTIR showed bands at 599, 963, 1,693, 2,299, 2,891, and 3,780 cm−1 for all the types of AgNPs indicating the presence of bacterial biomolecules with the developed AgNPs. The size and morphology of the AgNPs varied from 10 nm to several microns and exhibited spherical to porous sheets-like structures. The percentage of Ag varied from 37.8% (wt.%) to 61.6%, i.e., highest in AgNPs-K and lowest in AgNPs-M. Furthermore, the synthesized AgNPs exhibited potential for environmental remediation, with AgNPs-M exhibiting the highest removal efficiency (19.24% at 120 min) for methyl orange dye in simulated wastewater. Further, all three types of AgNPs were evaluated for the removal of methyl orange dye from the simulated wastewater, where the highest dye removal percentage was 19.24% at 120 min by AgNPs-M. Antibacterial potential of the synthesized AgNPs assessment against both Gram…
bibliographic citation: Patel et al. (2024) Bacteriogenic synthesis of morphologically diverse silver nanoparticles and their assessment for methyl orange dye removal and antimicrobial activity. PeerJ 12:e17328 https://doi.org/10.7717/peerj.17328
date submitted: 2023-09-22
date accepted: 2024-04-11
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Patel
  given name: Bhakti
author list: Agent
  family name: Yadav
  given name: Virendra Kumar
author list: Agent
  family name: Desai
  given name: Reema
author list: Agent
  family name: Patel
  given name: Shreya
author list: Agent
  family name: Amari
  given name: Abdelfattah
author list: Agent
  family name: Choudhary
  given name: Nisha
author list: Agent
  family name: Osman
  given name: Haitham
author list: Agent
  family name: Patel
  given name: Rajat
author list: Agent
  family name: Balram
  given name: Deepak
author list: Agent
  family name: Lian
  given name: Kuang-Yow
author list: Agent
  family name: Sahoo
  given name: Dipak Kumar
author list: Agent
  family name: Patel
  given name: Ashish
doi: 10.7717/peerj.17328
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: © 2024 Patel et al.
attribution name: Patel et al.

Leeches Baicalobdella torquata feed on hemolymph but have a low effect on the cellular immune response of amphipod Eulimnogammarus verrucosus from Lake Baikal
type: item
type: AcademicArticle
description: Lake Baikal is one of the largest and oldest freshwater reservoirs on the planet with a huge endemic diversity of amphipods (Amphipoda, Crustacea). These crustaceans have various symbiotic relationships, including the rarely described phenomenon of leech parasitism on amphipods. It is known that leeches feeding on hemolymph of crustacean hosts can influence their physiology, especially under stressful conditions. Here we show that leeches Baicalobdella torquata (Grube, 1871) found on gills of Eulimnogammarus verrucosus (Gerstfeldt, 1858), one of the most abundant amphipods in the Baikal littoral zone, indeed feed on the hemolymph of their host. However, the leech infection had no effect on immune parameters such as hemocyte concentration or phenoloxidase activity and also did not affect glycogen content. The intensity of hemocyte reaction to foreign bodies in a primary culture was identical between leech-free and leech-infected animals. Artificial infection with leeches also had only a subtle effect on the course of a model microbial infection in terms of hemocyte concentration and composition. Despite we cannot fully exclude deleterious effects of the parasites, our study indicates a low influence of a few leeches on E. verrucosus and shows that leech-infected amphipods can be used at least for some types of ecophysiological experiments.
format: application/pdf
format: text/html
creator: Anna Nazarova
creator: Andrei Mutin
creator: Denis Skafar
creator: Nadezhda Bolbat
creator: Sofya Sedova
creator: Polina Chupalova
creator: Vasiliy Pomazkin
creator: Polina Drozdova
creator: Anton Gurkov
creator: Maxim Timofeyev
subject: Ecology
subject: Parasitology
subject: Zoology
subject: Freshwater Biology
description: doi:10.7717/peerj.17348
publisher: PeerJ Inc.
rights: © 2024 Nazarova et al.
abstract: Lake Baikal is one of the largest and oldest freshwater reservoirs on the planet with a huge endemic diversity of amphipods (Amphipoda, Crustacea). These crustaceans have various symbiotic relationships, including the rarely described phenomenon of leech parasitism on amphipods. It is known that leeches feeding on hemolymph of crustacean hosts can influence their physiology, especially under stressful conditions. Here we show that leeches Baicalobdella torquata (Grube, 1871) found on gills of Eulimnogammarus verrucosus (Gerstfeldt, 1858), one of the most abundant amphipods in the Baikal littoral zone, indeed feed on the hemolymph of their host. However, the leech infection had no effect on immune parameters such as hemocyte concentration or phenoloxidase activity and also did not affect glycogen content. The intensity of hemocyte reaction to foreign bodies in a primary culture was identical between leech-free and leech-infected animals. Artificial infection with leeches also had only a subtle effect on the course of a model microbial infection in terms of hemocyte concentration and composition. Despite we cannot fully exclude deleterious effects of the parasites, our study indicates a low influence of a few leeches on E. verrucosus and shows that leech-infected amphipods can be used at least for some types of ecophysiological experiments.
bibliographic citation: Nazarova et al. (2024) Leeches Baicalobdella torquata feed on hemolymph but have a low effect on the cellular immune response of amphipod Eulimnogammarus verrucosus from Lake Baikal. PeerJ 12:e17348 https://doi.org/10.7717/peerj.17348
date submitted: 2023-12-11
date accepted: 2024-04-17
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Nazarova
  given name: Anna
author list: Agent
  family name: Mutin
  given name: Andrei
author list: Agent
  family name: Skafar
  given name: Denis
author list: Agent
  family name: Bolbat
  given name: Nadezhda
author list: Agent
  family name: Sedova
  given name: Sofya
author list: Agent
  family name: Chupalova
  given name: Polina
author list: Agent
  family name: Pomazkin
  given name: Vasiliy
author list: Agent
  family name: Drozdova
  given name: Polina
author list: Agent
  family name: Gurkov
  given name: Anton
author list: Agent
  family name: Timofeyev
  given name: Maxim
doi: 10.7717/peerj.17348
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: ©2024 Nazarova et al.
attribution name: Nazarova et al.

Comparing trophic position estimates using bulk and compound specific stable isotope analyses: applying new approaches to mackerel icefish Champsocephalus gunnari
type: item
type: AcademicArticle
description: Quantifying the tropic position (TP) of an animal species is key to understanding its ecosystem function. While both bulk and compound-specific analyses of stable isotopes are widely used for this purpose, few studies have assessed the consistency between and within such approaches. Champsocephalus gunnari is a specialist teleost that predates almost exclusively on Antarctic krill Euphausia superba. This well-known and nearly constant trophic relationship makes C. gunnari particularly suitable for assessing consistency between TP methods under field conditions. In the present work, we produced and compared TP estimates for C. gunnari and its main prey using a standard bulk and two amino acid-specific stable isotope approaches (CSI-AA). One based on the difference between glutamate and phenylalanine (TPGlx-Phe), and the other on the proline-phenylalanine difference (TPPro-Phe). To do that, samples from C. gunnari, E. superba and four other pelagic invertebrate and fish species, all potential prey for C.gunnari, were collected off the South Orkney Islands between January and March 2019, analyzed using standard isotopic ratio mass spectrometry methods and interpreted following a Bayesian approach. Median estimates (CI95%) for C. gunnari were similar between TPbulk (3.6; CI95%: 3.0-4.8) and TPGlx-Phe(3.4; CI95%:3.2-3.6), and lower for TPPro-Phe (3.1; CI95%:3.0-3.3). TP differences between C. gunnari and E. superba were 1.4, 1.1 and 1.2, all compatible with expectations from the monospecific diet of this predator (ΔTP=1). While these results suggest greater accuracy for Glx-Phe and Pro-Phe, differences observed between both CSI-AA approaches suggests these methods may require further validation before becoming a standard tool for trophic ecology.
format: application/pdf
format: text/html
creator: Jose Antonio Canseco
creator: Edwin J. Niklitschek
creator: Claudio Quezada-Romegialli
creator: Chris Yarnes
creator: Chris Harrod
subject: Aquaculture, Fisheries and Fish Science
subject: Biochemistry
subject: Ecology
subject: Marine Biology
subject: Data Science
description: doi:10.7717/peerj.17372
publisher: PeerJ Inc.
rights: © 2024 Canseco et al.
abstract: Quantifying the tropic position (TP) of an animal species is key to understanding its ecosystem function. While both bulk and compound-specific analyses of stable isotopes are widely used for this purpose, few studies have assessed the consistency between and within such approaches. Champsocephalus gunnari is a specialist teleost that predates almost exclusively on Antarctic krill Euphausia superba. This well-known and nearly constant trophic relationship makes C. gunnari particularly suitable for assessing consistency between TP methods under field conditions. In the present work, we produced and compared TP estimates for C. gunnari and its main prey using a standard bulk and two amino acid-specific stable isotope approaches (CSI-AA). One based on the difference between glutamate and phenylalanine (TPGlx-Phe), and the other on the proline-phenylalanine difference (TPPro-Phe). To do that, samples from C. gunnari, E. superba and four other pelagic invertebrate and fish species, all potential prey for C.gunnari, were collected off the South Orkney Islands between January and March 2019, analyzed using standard isotopic ratio mass spectrometry methods and interpreted following a Bayesian approach. Median estimates (CI95%) for C. gunnari were similar between TPbulk (3.6; CI95%: 3.0-4.8) and TPGlx-Phe(3.4; CI95%:3.2-3.6), and lower for TPPro-Phe (3.1; CI95%:3.0-3.3). TP differences between C. gunnari and E. superba were 1.4, 1.1 and 1.2, all compatible with expectations from the monospecific diet of this predator (ΔTP=1). While these results suggest greater accuracy for Glx-Phe and Pro-Phe, differences observed between both CSI-AA approaches suggests these methods may require further validation before becoming a standard tool for trophic ecology.
bibliographic citation: Canseco et al. (2024) Comparing trophic position estimates using bulk and compound specific stable isotope analyses: applying new approaches to mackerel icefish Champsocephalus gunnari. PeerJ 12:e17372 https://doi.org/10.7717/peerj.17372
date submitted: 2024-02-09
date accepted: 2024-04-18
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Canseco
  given name: Jose Antonio
author list: Agent
  family name: Niklitschek
  given name: Edwin J.
author list: Agent
  family name: Quezada-Romegialli
  given name: Claudio
author list: Agent
  family name: Yarnes
  given name: Chris
author list: Agent
  family name: Harrod
  given name: Chris
doi: 10.7717/peerj.17372
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: ©2024 Canseco et al.
attribution name: Canseco et al.

Occurrence patterns of sympatric forest wallabies: assessing the influence of structural habitat attributes on the coexistence of Thylogale thetis and T. stigmatica
type: item
type: AcademicArticle
description: Background We studied the occurrence of two sympatric wallabies, the red-necked pademelon (Thylogale thetis) and the red-legged pademelon (T. stigmatica) in northeastern New South Wales, Australia in relation to structural habitat attributes. At our study site, both species inhabit closed forest environments and have overlapping distributions, but T. thetis leaves the forest at night to graze adjacent grassy forest edges whereas T. stigmatica remains within the forest and browses forest vegetation. The objectives of the study were to investigate how structural attributes of two forest types, wet sclerophyll forest and rainforest, relate to the fine-scale occurrence of these two wallaby species within the forested environment. Methods We gathered occurrence data from 48 camera trap stations divided equally between rainforest and wet sclerophyll forest. At each camera point, we also measured a range of structural habitat attributes to determine habitat affiliations for the two Thylogale species. Principal component analyses were used to describe major trends in habitat, and generalised linear models were used to describe the efficacy of the variables in predicting habitat occurrence of each species. Results The number of occurrences of Thylogale thetis was significantly greater than occurrences of T. stigmatica, which was driven by significantly greater occurrences of T. thetis in wet sclerophyll forest. There was both spatial and temporal partitioning between the two species; there was a significant difference in the occurrences of the two species at individual cameras and T. stigmatica had a different activity schedule than T. thetis in wet sclerophyll forest, where the latter reached its greatest rate of occurrence. At a finer (camera station) scale, occurrences of T. thetis increased with proximity to roads and grassy edges and at sites that were less rocky and less steep. T. stigmatica occurrence increased in the presence of rainforest elements like vines, palms …
format: application/pdf
format: text/html
creator: Lucy E.V. Smith
creator: Nigel R. Andrew
creator: Karl Vernes
subject: Conservation Biology
subject: Ecology
subject: Zoology
description: doi:10.7717/peerj.17383
publisher: PeerJ Inc.
rights: © 2024 Smith et al.
abstract: Background We studied the occurrence of two sympatric wallabies, the red-necked pademelon (Thylogale thetis) and the red-legged pademelon (T. stigmatica) in northeastern New South Wales, Australia in relation to structural habitat attributes. At our study site, both species inhabit closed forest environments and have overlapping distributions, but T. thetis leaves the forest at night to graze adjacent grassy forest edges whereas T. stigmatica remains within the forest and browses forest vegetation. The objectives of the study were to investigate how structural attributes of two forest types, wet sclerophyll forest and rainforest, relate to the fine-scale occurrence of these two wallaby species within the forested environment. Methods We gathered occurrence data from 48 camera trap stations divided equally between rainforest and wet sclerophyll forest. At each camera point, we also measured a range of structural habitat attributes to determine habitat affiliations for the two Thylogale species. Principal component analyses were used to describe major trends in habitat, and generalised linear models were used to describe the efficacy of the variables in predicting habitat occurrence of each species. Results The number of occurrences of Thylogale thetis was significantly greater than occurrences of T. stigmatica, which was driven by significantly greater occurrences of T. thetis in wet sclerophyll forest. There was both spatial and temporal partitioning between the two species; there was a significant difference in the occurrences of the two species at individual cameras and T. stigmatica had a different activity schedule than T. thetis in wet sclerophyll forest, where the latter reached its greatest rate of occurrence. At a finer (camera station) scale, occurrences of T. thetis increased with proximity to roads and grassy edges and at sites that were less rocky and less steep. T. stigmatica occurrence increased in the presence of rainforest elements like vines, palms …
bibliographic citation: Smith et al. (2024) Occurrence patterns of sympatric forest wallabies: assessing the influence of structural habitat attributes on the coexistence of Thylogale thetis and T. stigmatica. PeerJ 12:e17383 https://doi.org/10.7717/peerj.17383
date submitted: 2023-05-17
date accepted: 2024-04-21
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Smith
  given name: Lucy E.V.
author list: Agent
  family name: Andrew
  given name: Nigel R.
author list: Agent
  family name: Vernes
  given name: Karl
doi: 10.7717/peerj.17383
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: ©2024 Smith et al.
attribution name: Smith et al.

Validity and reliability of My Jump 2® app to measure the vertical jump on elite women beach volleyball players
type: item
type: AcademicArticle
description: Purpose The aim of this study was to assess the reliability and validity of the My Jump 2® app in measuring jump height, flight time, and peak power among elite women beach volleyball players on sand surfaces. Methods Eleven elite female beach volleyball players (aged 23.6 ± 6.2 years; weight 66.3 ± 5.8 kg; height 174.4 ± 5.8 cm; with 8.4 ± 4.8 years of professional experience) participated in this study. Each player performed six countermovement jumps in a wooden box filled with sand on a force platform while simultaneously recording a video for subsequent analysis using the My Jump 2® app. Results We found excellent agreement for flight time, jump height and peak power between observers (ICC = 0.92, 0.91 and 0.97, respectively). No significant differences between force platform and My Jump 2® app were detected in the values obtained for the three variables (P > 0.05). For the force platform and the My Jump 2® app, we found a good agreement measuring jump height and flight time (ICC = 0.85 and 0.85, respectively). However, we only found a moderate agreement for peak power (ICC = 0.64). The difference in jump height showed a limit of agreement between −4.10 and 4.74 cm in Bland-Altman, indicating a high level of agreement between the two measurement tools. Conclusion Based on our findings, the My Jump 2® app reveals a valid tool for measuring jump height and flight time of CMJ on sand surfaces. However, more caution is needed when measuring peak power.
format: application/pdf
format: text/html
creator: Alexandre Igor Araripe Medeiros
creator: Geovani Messias da Silva
creator: Francisco Oliveira Neto
creator: Mário Simim
creator: Túlio Banja
creator: Victor S. Coswig
creator: José Afonso
creator: Ana Ramos
creator: Isabel Mesquita
subject: Kinesiology
subject: Biomechanics
subject: Sports Medicine
description: doi:10.7717/peerj.17387
publisher: PeerJ Inc.
rights: © 2024 Medeiros et al.
abstract: Purpose The aim of this study was to assess the reliability and validity of the My Jump 2® app in measuring jump height, flight time, and peak power among elite women beach volleyball players on sand surfaces. Methods Eleven elite female beach volleyball players (aged 23.6 ± 6.2 years; weight 66.3 ± 5.8 kg; height 174.4 ± 5.8 cm; with 8.4 ± 4.8 years of professional experience) participated in this study. Each player performed six countermovement jumps in a wooden box filled with sand on a force platform while simultaneously recording a video for subsequent analysis using the My Jump 2® app. Results We found excellent agreement for flight time, jump height and peak power between observers (ICC = 0.92, 0.91 and 0.97, respectively). No significant differences between force platform and My Jump 2® app were detected in the values obtained for the three variables (P > 0.05). For the force platform and the My Jump 2® app, we found a good agreement measuring jump height and flight time (ICC = 0.85 and 0.85, respectively). However, we only found a moderate agreement for peak power (ICC = 0.64). The difference in jump height showed a limit of agreement between −4.10 and 4.74 cm in Bland-Altman, indicating a high level of agreement between the two measurement tools. Conclusion Based on our findings, the My Jump 2® app reveals a valid tool for measuring jump height and flight time of CMJ on sand surfaces. However, more caution is needed when measuring peak power.
bibliographic citation: Medeiros et al. (2024) Validity and reliability of My Jump 2® app to measure the vertical jump on elite women beach volleyball players. PeerJ 12:e17387 https://doi.org/10.7717/peerj.17387
date submitted: 2023-09-15
date accepted: 2024-04-23
issued: 2024-05-17
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Medeiros
  given name: Alexandre Igor Araripe
author list: Agent
  family name: Silva
  given name: Geovani Messias da
author list: Agent
  family name: Neto
  given name: Francisco Oliveira
author list: Agent
  family name: Simim
  given name: Mário
author list: Agent
  family name: Banja
  given name: Túlio
author list: Agent
  family name: Coswig
  given name: Victor S.
author list: Agent
  family name: Afonso
  given name: José
author list: Agent
  family name: Ramos
  given name: Ana
author list: Agent
  family name: Mesquita
  given name: Isabel
doi: 10.7717/peerj.17387
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-17
copyright: © 2024 Medeiros et al.
attribution name: Medeiros et al.

Seasonal occurrence and individual variability of bull sharks, Carcharhinus leucas, in a marine reserve of the southwestern Gulf of California
type: item
type: AcademicArticle
description: Background Studying how the bull sharks aggregate and how they can be driven by life history traits such as reproduction, prey availability, predator avoidance and social interaction in a National Park such as Cabo Pulmo, is key to understand and protect the species. Methods The occurrence variability of 32 bull sharks tracked with passive acoustic telemetry were investigated via a hierarchical logistic regression model, with inference conducted in a Bayesian framework, comparing sex, and their response to temperature and chlorophyll. Results Based on the fitted model, occurrence probability varied by sex and length. Juvenile females had the highest values, whereas adult males the lowest. A strong seasonality or day of the year was recorded, where sharks were generally absent during September–November. However, some sharks did not show the common pattern, being detected just for a short period. This is one of the first studies where the Bayesian framework is used to study passive acoustic telemetry proving the potential to be used in further studies.
format: application/pdf
format: text/html
creator: Frida Lara-Lizardi
creator: Eleazar Castro
creator: Vianey Leos Barajas
creator: Juan Manuel Morales
creator: Edgar Mauricio Hoyos-Padilla
creator: James Ketchum
subject: Animal Behavior
subject: Aquaculture, Fisheries and Fish Science
subject: Ecology
subject: Marine Biology
subject: Zoology
description: doi:10.7717/peerj.17192
publisher: PeerJ Inc.
rights: © 2024 Lara-Lizardi et al.
abstract: Background Studying how the bull sharks aggregate and how they can be driven by life history traits such as reproduction, prey availability, predator avoidance and social interaction in a National Park such as Cabo Pulmo, is key to understand and protect the species. Methods The occurrence variability of 32 bull sharks tracked with passive acoustic telemetry were investigated via a hierarchical logistic regression model, with inference conducted in a Bayesian framework, comparing sex, and their response to temperature and chlorophyll. Results Based on the fitted model, occurrence probability varied by sex and length. Juvenile females had the highest values, whereas adult males the lowest. A strong seasonality or day of the year was recorded, where sharks were generally absent during September–November. However, some sharks did not show the common pattern, being detected just for a short period. This is one of the first studies where the Bayesian framework is used to study passive acoustic telemetry proving the potential to be used in further studies.
bibliographic citation: Lara-Lizardi et al. (2024) Seasonal occurrence and individual variability of bull sharks, Carcharhinus leucas, in a marine reserve of the southwestern Gulf of California. PeerJ 12:e17192 https://doi.org/10.7717/peerj.17192
date submitted: 2023-03-24
date accepted: 2024-03-13
issued: 2024-05-16
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Lara-Lizardi
  given name: Frida
author list: Agent
  family name: Castro
  given name: Eleazar
author list: Agent
  family name: Leos Barajas
  given name: Vianey
author list: Agent
  family name: Morales
  given name: Juan Manuel
author list: Agent
  family name: Hoyos-Padilla
  given name: Edgar Mauricio
author list: Agent
  family name: Ketchum
  given name: James
doi: 10.7717/peerj.17192
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-16
copyright: ©2024 Lara-Lizardi et al.
attribution name: Lara-Lizardi et al.

Balance performance, falls-efficacy and social participation in patients with type 2 diabetes mellitus with and without vestibular dysfunction
type: item
type: AcademicArticle
description: Background The performance of balance is an important factor to perform activities. The complications of type 2 diabetes mellitus (T2DM), especially vestibular dysfunction (VD), could decrease balance performance and falls-efficacy (FE) which consequently impacts social participation and quality of life (QoL). Purpose This study aimed to compare balance performance, FE, social participation and QoL between individuals with T2DM with and without VD. Methods The participants comprised 161 T2DM with VD and 161 without VD. Three clinical tests used for confirming VD included the Head Impulse Test (HIT), the Dix Hallpike Test (DHT) and the Supine Roll Test (SRT). The scores of static and dynamic balances, FE, social participation and QoL were compared between groups. Results The balance performance, FE, social participation and QoL were lower in the group with VD. The number of patients who had severe social restriction was higher in T2DM with VD than without VD (58.4% vs 48.4%). Moreover, all domains of QoL (physical, psychological, social relationships and environmental) were lower in T2DM with VD than without VD. Conclusion The presence of VD in T2DM patients was associated with decreased physical balance performances and increased social and QoL disengagement. Comprehensive management related to balance and FE, as well as the monitoring to support social participation and QoL, should be emphasized in patients with T2DM with VD.
format: application/pdf
format: text/html
creator: Dwi Rosella Komalasari
creator: Mantana Vongsirinavarat
creator: Vimonwan Hiengkaew
creator: Nantinee Nualnim
subject: Diabetes and Endocrinology
subject: Geriatrics
subject: Kinesiology
subject: Rehabilitation
description: doi:10.7717/peerj.17287
publisher: PeerJ Inc.
rights: © 2024 Komalasari et al.
abstract: Background The performance of balance is an important factor to perform activities. The complications of type 2 diabetes mellitus (T2DM), especially vestibular dysfunction (VD), could decrease balance performance and falls-efficacy (FE) which consequently impacts social participation and quality of life (QoL). Purpose This study aimed to compare balance performance, FE, social participation and QoL between individuals with T2DM with and without VD. Methods The participants comprised 161 T2DM with VD and 161 without VD. Three clinical tests used for confirming VD included the Head Impulse Test (HIT), the Dix Hallpike Test (DHT) and the Supine Roll Test (SRT). The scores of static and dynamic balances, FE, social participation and QoL were compared between groups. Results The balance performance, FE, social participation and QoL were lower in the group with VD. The number of patients who had severe social restriction was higher in T2DM with VD than without VD (58.4% vs 48.4%). Moreover, all domains of QoL (physical, psychological, social relationships and environmental) were lower in T2DM with VD than without VD. Conclusion The presence of VD in T2DM patients was associated with decreased physical balance performances and increased social and QoL disengagement. Comprehensive management related to balance and FE, as well as the monitoring to support social participation and QoL, should be emphasized in patients with T2DM with VD.
bibliographic citation: Komalasari et al. (2024) Balance performance, falls-efficacy and social participation in patients with type 2 diabetes mellitus with and without vestibular dysfunction. PeerJ 12:e17287 https://doi.org/10.7717/peerj.17287
date submitted: 2023-03-02
date accepted: 2024-04-02
issued: 2024-05-16
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Komalasari
  given name: Dwi Rosella
author list: Agent
  family name: Vongsirinavarat
  given name: Mantana
author list: Agent
  family name: Hiengkaew
  given name: Vimonwan
author list: Agent
  family name: Nualnim
  given name: Nantinee
doi: 10.7717/peerj.17287
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-16
copyright: ©2024 Komalasari et al.
attribution name: Komalasari et al.

Environmental awareness and sustainable consumption behaviours of Turkish nursing students
type: item
type: AcademicArticle
description: Objectives This study aims to determine the environmental awareness and sustainable consumption behaviours of nursing students. Methods This cross-sectional study was conducted with 380 undergraduate nursing students studying at Faculty of Nursing, Ege University, Türkiye. The Personal Information Form, Environmental Awareness Scale (EAS), and Sustainable Consumption Behaviours Scale (SCBS) were used to collect the research data. Number, percentage, mean, Kolmogorov-Smirnov Z test, t-test, one-way analysis of variance, Pearson’s correlation test, and linear regression analysis were used in statistical evaluation. Results The mean total score on the EAS was 46.12 (SD = 6.60), and the mean total score of the SCBS was 61.83 (SD = 9.10). A significant, moderate, and positive correlation was found between students’ environmental awareness and sustainable consumption behaviours. Moreover, students’ gender and the people they lived with caused statistically significant differences in the EAS score. The people students lived with, the place where they lived for the longest time, and their perceived income level caused statistically significant differences in the SCBS score. Conclusions Nursing students had high environmental awareness and moderate to good sustainable consumption behaviours. It is necessary to include the contribution of sustainable practices to the environment and the effects of these practices on human health in curricula for nurses and thus provide environmental awareness to students.
format: application/pdf
format: text/html
creator: Renginar Öztürk Dönmez
creator: Eda Yardımcı
subject: Nursing
subject: Natural Resource Management
subject: Environmental Health
description: doi:10.7717/peerj.17366
publisher: PeerJ Inc.
rights: © 2024 Dönmez and Yardımcı
abstract: Objectives This study aims to determine the environmental awareness and sustainable consumption behaviours of nursing students. Methods This cross-sectional study was conducted with 380 undergraduate nursing students studying at Faculty of Nursing, Ege University, Türkiye. The Personal Information Form, Environmental Awareness Scale (EAS), and Sustainable Consumption Behaviours Scale (SCBS) were used to collect the research data. Number, percentage, mean, Kolmogorov-Smirnov Z test, t-test, one-way analysis of variance, Pearson’s correlation test, and linear regression analysis were used in statistical evaluation. Results The mean total score on the EAS was 46.12 (SD = 6.60), and the mean total score of the SCBS was 61.83 (SD = 9.10). A significant, moderate, and positive correlation was found between students’ environmental awareness and sustainable consumption behaviours. Moreover, students’ gender and the people they lived with caused statistically significant differences in the EAS score. The people students lived with, the place where they lived for the longest time, and their perceived income level caused statistically significant differences in the SCBS score. Conclusions Nursing students had high environmental awareness and moderate to good sustainable consumption behaviours. It is necessary to include the contribution of sustainable practices to the environment and the effects of these practices on human health in curricula for nurses and thus provide environmental awareness to students.
bibliographic citation: Dönmez et al. (2024) Environmental awareness and sustainable consumption behaviours of Turkish nursing students. PeerJ 12:e17366 https://doi.org/10.7717/peerj.17366
date submitted: 2023-09-28
date accepted: 2024-04-18
issued: 2024-05-16
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Dönmez
  given name: Renginar Öztürk
author list: Agent
  family name: Yardımcı
  given name: Eda
doi: 10.7717/peerj.17366
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-16
copyright: © 2024 Dönmez and Yardımcı
attribution name: Dönmez and Yardımcı

Effects of extreme meteorological factors and high air pollutant concentrations on the incidence of hand, foot and mouth disease in Jining, China
type: item
type: AcademicArticle
description: Background The evidence on the effects of extreme meteorological conditions and high air pollution levels on incidence of hand, foot and mouth disease (HFMD) is limited. Moreover, results of the available studies are inconsistent. Further investigations are imperative to elucidate the specific issue. Methods Data on the daily cases of HFMD, meteorological factors and air pollution were obtained from 2017 to 2022 in Jining City. We employed distributed lag nonlinear model (DLNM) incorporated with Poisson regression to explore the impacts of extreme meteorological conditions and air pollution on HFMD incidence. Results We found that there were nonlinear relationships between temperature, wind speed, PM2.5, SO2, O3 and HFMD. The cumulative risk of extreme high temperature was higher at the 95th percentile (P95th) than at the 90th percentile(P90th), and the RR values for both reached their maximum at 10-day lag (P95th RR = 1.880 (1.261–2.804), P90th RR = 1.787 (1.244–2.569)), the hazardous effect of extreme low temperatures on HFMD is faster than that of extreme high temperatures. The cumulative effect of extreme low wind speeds reached its maximum at 14-day lag (P95th RR = 1.702 (1.389-2.085), P90th RR = 1.498(1.283–1.750)). The cumulative effect of PM2.5 concentration at the P90th was largest at 14-day lag (RR = 1.637 (1.069–2.506)), and the cumulative effect at the P95th was largest at 10-day lag (RR = 1.569 (1.021–2.411)). High SO2 concentration at the P95th at 14-day lag was associated with higher risk for HFMD (RR: 1.425 (1.001–2.030)). Conclusion Our findings suggest that high temperature, low wind speed, and high concentrations of PM2.5 and SO2 are associated with an increased risk of HFMD. This study not only adds insights to the understanding of the impact of extreme meteorological conditions and high levels of air pollutants on HFMD incidence but also holds practical significance for the development and enhancement of an early warning system for HFMD.
format: application/pdf
format: text/html
creator: Haoyue Cao
creator: Rongrong Xu
creator: Yongmei Liang
creator: Qinglin Li
creator: Wenguo Jiang
creator: Yudi Jin
creator: Wenjun Wang
creator: Juxiang Yuan
subject: Epidemiology
subject: Pediatrics
subject: Public Health
subject: Environmental Health
description: doi:10.7717/peerj.17163
publisher: PeerJ Inc.
rights: © 2024 Cao et al.
abstract: Background The evidence on the effects of extreme meteorological conditions and high air pollution levels on incidence of hand, foot and mouth disease (HFMD) is limited. Moreover, results of the available studies are inconsistent. Further investigations are imperative to elucidate the specific issue. Methods Data on the daily cases of HFMD, meteorological factors and air pollution were obtained from 2017 to 2022 in Jining City. We employed distributed lag nonlinear model (DLNM) incorporated with Poisson regression to explore the impacts of extreme meteorological conditions and air pollution on HFMD incidence. Results We found that there were nonlinear relationships between temperature, wind speed, PM2.5, SO2, O3 and HFMD. The cumulative risk of extreme high temperature was higher at the 95th percentile (P95th) than at the 90th percentile(P90th), and the RR values for both reached their maximum at 10-day lag (P95th RR = 1.880 (1.261–2.804), P90th RR = 1.787 (1.244–2.569)), the hazardous effect of extreme low temperatures on HFMD is faster than that of extreme high temperatures. The cumulative effect of extreme low wind speeds reached its maximum at 14-day lag (P95th RR = 1.702 (1.389-2.085), P90th RR = 1.498(1.283–1.750)). The cumulative effect of PM2.5 concentration at the P90th was largest at 14-day lag (RR = 1.637 (1.069–2.506)), and the cumulative effect at the P95th was largest at 10-day lag (RR = 1.569 (1.021–2.411)). High SO2 concentration at the P95th at 14-day lag was associated with higher risk for HFMD (RR: 1.425 (1.001–2.030)). Conclusion Our findings suggest that high temperature, low wind speed, and high concentrations of PM2.5 and SO2 are associated with an increased risk of HFMD. This study not only adds insights to the understanding of the impact of extreme meteorological conditions and high levels of air pollutants on HFMD incidence but also holds practical significance for the development and enhancement of an early warning system for HFMD.
bibliographic citation: Cao et al. (2024) Effects of extreme meteorological factors and high air pollutant concentrations on the incidence of hand, foot and mouth disease in Jining, China. PeerJ 12:e17163 https://doi.org/10.7717/peerj.17163
date submitted: 2023-11-09
date accepted: 2024-03-06
issued: 2024-05-15
is part of: PeerJ
license: https://creativecommons.org/licenses/by/4.0/
author list: Agent
  family name: Cao
  given name: Haoyue
author list: Agent
  family name: Xu
  given name: Rongrong
author list: Agent
  family name: Liang
  given name: Yongmei
author list: Agent
  family name: Li
  given name: Qinglin
author list: Agent
  family name: Jiang
  given name: Wenguo
author list: Agent
  family name: Jin
  given name: Yudi
author list: Agent
  family name: Wang
  given name: Wenjun
author list: Agent
  family name: Yuan
  given name: Juxiang
doi: 10.7717/peerj.17163
volume: 12
issn: 2167-8359
publication name: PeerJ
publication date: 2024-05-15
copyright: © 2024 Cao et al.
attribution name: Cao et al.

PeerJ
type: Periodical
uri: PeerJ
issn: 2167-8359