title: PeerJ
description:  Articles published in PeerJ
link: https://peerj.com/articles/index.rss3?journal=peerj&page=675
creator: info@peerj.com PeerJ
errorsTo: info@peerj.com PeerJ
language: en

title: Protecting endangered megafauna through AI analysis of drone images in a low-connectivity setting: a case study from Namibia
link: https://peerj.com/articles/13779
last-modified: 2022-08-03
description: Assessing the numbers and distribution of at-risk megafauna such as the black rhino (Diceros bicornis) is key to effective conservation, yet such data are difficult to obtain. Many current monitoring technologies are invasive to the target animals and expensive. Satellite monitoring is emerging as a potential tool for very large animals (e.g., elephant) but detecting smaller species requires higher resolution imaging. Drones can deliver the required resolution and speed of monitoring, but challenges remain in delivering automated monitoring systems where internet connectivity is unreliable or absent. This study describes a model built to run on a drone to identify in situ images of megafauna. Compared with previously reported studies, this automated detection framework has a lower hardware cost and can function with a reduced internet bandwidth requirement for local network communication. It proposes the use of a Jetson Xavier NX, onboard a Parrot Anafi drone, connected to the internet throughout the flight to deliver a lightweight web-based notification system upon detection of the target species. The GPS location with the detected target species images is sent using MQ Telemetry Transport (MQTT), a lightweight messaging protocol using a publisher/subscriber architecture for IoT devices. It provides reliable message delivery when internet connection is sporadic. We used a YOLOv5l6 object detection architecture trained to identify a bounding box for one of five objects of interest in a frame of video. At an intersection over union (IoU) threshold of 0.5, our model achieved an average precision (AP) of 0.81 for black rhino (our primary target) and 0.83 for giraffe (Giraffa giraffa). The model was less successful at identifying the other smaller objects which were not our primary targets: 0.34, 0.25, and 0.42 for ostrich (Struthio camelus australis), springbok (Antidorcas marsupialis) and human respectively. We used several techniques to optimize performance and overcome the inherent challenge of small objects (animals) in the data. Although our primary focus for the development of the model was rhino, we included other species classes to emulate field conditions where many animal species are encountered, and thus reduce the false positive occurrence rate for rhino detections. To constrain model overfitting, we trained the model on a dataset with varied terrain, angle and lighting conditions and used data augmentation techniques (i.e., GANs). We used image tiling and a relatively larger (i.e., higher resolution) image input size to compensate for the difficulty faced in detecting small objects when using YOLO. In this study, we demonstrated the potential of a drone-based AI pipeline model to automate the detection of free-ranging megafauna detection in a remote setting and create alerts to a wildlife manager in a relatively poorly connected field environment.
creator: Alice Hua
creator: Kevin Martin
creator: Yuzeng Shen
creator: Nicole Chen
creator: Catherine Mou
creator: Maximilian Sterk
creator: Berend Reinhard
creator: Friedrich F. Reinhard
creator: Stephen Lee
creator: Sky Alibhai
creator: Zoe C. Jewell
uri: https://doi.org/10.7717/peerj.13779
license: https://creativecommons.org/licenses/by/4.0/
rights: © 2022 Hua et al.

title: Differential proteomic analysis of mouse cerebrums with high-fat diet (HFD)-induced hyperlipidemia
link: https://peerj.com/articles/13806
last-modified: 2022-08-03
description: Hyperlipidemia is a chronic disease characterized by elevated blood cholesterol and triglycerides and there is accumulated evidence that the disease might affect brain functions. Here we report on a proteomic analysis of the brain proteins in hyperlipidemic mice. Hyperlipidemia was successfully induced in mice by a 20 week high-fat diet (HFD) feeding (model group). A control group with a normal diet and a treatment group with HFD-fed mice treated with a lipid-lowering drug simvastatin (SIM) were established accordingly. The proteins were extracted from the left and right cerebrum hemispheres of the mice in the three groups and subjected to shotgun proteomic analysis. A total of 4,422 proteins were detected in at least half of the samples, among which 324 proteins showed significant difference (fold change >1.5 or <0.67, p < 0.05) in at least one of the four types of comparisons (left cerebrum hemispheres of the model group versus the control group, right cerebrums of model versus control, left cerebrums of SIM versus model, right cerebrums of SIM versus model). Biological process analysis revealed many of these proteins were enriched in the processes correlated with lipid metabolism, neurological disorders, synaptic events and nervous system development. For the first time, it has been reported that some of the proteins have been altered in the brain under the conditions of HFD feeding, obesity or hyperlipidemia. Further, 22 brain processes-related proteins showed different expression in the two cerebrum hemispheres, suggesting changes of the brain proteins caused by hyperlipidemia might also be asymmetric. We hope this work will provide useful information to understand the effects of HFD and hyperlipidemia on brain proteins.
creator: Changming Chen
creator: Meiling Wen
creator: Caixia Wang
creator: Zhongwen Yuan
creator: Ya Jin
uri: https://doi.org/10.7717/peerj.13806
license: https://creativecommons.org/licenses/by/4.0/
rights: ©2022 Chen et al.

title: Assisted migration and the rare endemic plant species: the case of two endangered Mexican spruces
link: https://peerj.com/articles/13812
last-modified: 2022-08-03
description: BackgroundIn the projected climate change scenarios, assisted migration might play an important role in the ex situ conservation of the threatened plant species, by translocate them to similar suitable habitats outside their native distributions. However, it is unclear if such habitats will be available for the Rare Endemic Plant Species (REPS), because of their very restricted habitats. The aims of this study were to perform a population size assessment for the REPS Picea martinezii Patterson and Picea mexicana Martínez, and to evaluate the potential species distributions and their possibilities for assisted migration inside México and worldwide.MethodsWe performed demographic censuses, field surveys in search for new stands, and developed distribution models for Last Glacial Maximum (22,000 years ago), Middle Holocene (6,000 years ago), current (1961–1990) and future (2050 and 2070) periods, for the whole Mexican territory (considering climatic, soil, geologic and topographic variables) and for all global land areas (based only on climate).ResultsOur censuses showed populations of 89,266 and 39,059 individuals for P. martinezii and P. mexicana, respectively, including known populations and new stands. Projections for México indicated somewhat larger suitable areas in the past, now restricted to the known populations and new stands, where they will disappear by 2050 in a pessimistic climatic scenario, and scarce marginal areas (p = 0.5–0.79) remaining only for P. martinezii by 2070. Worldwide projections (based only on climate variables) revealed few marginal areas in 2050 only in México for P. martinezii, and several large areas (p ≥ 0.5) for P. mexicana around the world (all outside México), especially on the Himalayas in India and the Chungyang mountains in Taiwan with highly suitable (p ≥ 0.8) climate habitats in current and future (2050) conditions. However, those suitable areas are currently inhabited by other endemic spruces: Picea smithiana (Wall.) Boiss and Picea morrisonicola Hayata, respectively.ConclusionsAssisted migration would only be an option for P. martinezii on scarce marginal sites in México, and the possibilities for P. mexicana would be continental and transcontinental translocations. This rises two possible issues for future ex situ conservation programs: the first is related to whether or not consider assisted migration to marginal sites which do not cover the main habitat requirements for the species; the second is related to which species (the local or the foreign) should be prioritized for conservation when suitable habitat is found elsewhere but is inhabited by other endemic species. This highlights the necessity to discuss new policies, guidelines and mechanisms of international cooperation to deal with the expected high species extinction rates, linked to projected climate change.
creator: Eduardo Mendoza-Maya
creator: Erika Gómez-Pineda
creator: Cuauhtémoc Sáenz-Romero
creator: José Ciro Hernández-Díaz
creator: Carlos A. López-Sánchez
creator: J. Jesús Vargas-Hernández
creator: José Ángel Prieto-Ruíz
creator: Christian Wehenkel
uri: https://doi.org/10.7717/peerj.13812
license: https://creativecommons.org/licenses/by/4.0/
rights: © 2022 Mendoza-Maya et al.

title: Criteria for assessing the adaptive changes in mixed martial arts (MMA) athletes of strike fighting style in different training load regimes
link: https://peerj.com/articles/13827
last-modified: 2022-08-03
description: BackgroundTo study the peculiarities of changes in functional indicators and body composition parameters of mixed martial arts (MMA) athletes of strike fighting style and a number of biochemical blood indicators during two months of using different intensity training load regimes, and to determine the most informative criteria for assessing adaptive body changes in these training conditions.MethodsWe examined 40 MMA athletes (men) aged 20–22, who used mainly strike fighting style in their competitive activity, and divided them into 2 research groups (A and B), 20 athletes in each group. Group A athletes used medium intensity (Ra = 0.64), and group B—high intensity (Ra = 0.72) training load regime. To assess the adaptive body changes we applied methods of control testing of maximum muscle strength growth (1 RM), special training (the number of accurate kicks on the mannequin for 30 s), and bioimpedansometry. By monitoring biochemical parameters (testosterone, cortisol, creatinine, phosphorus, calcium, cholesterol, LDH) in the blood serum of athletes, we determined the peculiarities of adaptive-compensatory body reactions in response to training loads.ResultsThe obtained results of special training increased during the study period by an average of 10.5% in group B athletes, but group A participants’ results had no significant changes compared to basal data. The largest increase in the development of maximum muscle strength growth by an average of 44.4% was recorded after 2 months of research in group B. Group B athletes also had positive changes in body fat and fat-free mass indicators during the study which were two times higher than the results of group A. The laboratory studies and correlation analysis showed informative biochemical markers (cortisol, testosterone and creatinine) for assessing the condition of athletes in both groups before using high and medium training load regimes. The biochemical markers for assessing the adaptive-compensatory reactions of athletes in response to high-intensity physical stimuli at the beginning of the study were indicators of LDH and cholesterol, and in conditions of medium intensity it was LDH, testosterone and cortisol. After 2 months of study the set of biochemical markers assessing the adaptation processes before the load completely changed only in group B athletes and consisted of LDH, phosphorus, cholesterol, and calcium. At the same time, the set of biochemical criteria for assessing adaptive-compensatory reactions after training in group B athletes was completely changed compared with the data recorded at the beginning of the study.ConclusionDefining the optimal set of criteria for assessing the adaptive-compensatory changes in MMA athletes of strike fighting style will allow in the shortest possible time to correct the parameters of the training load regime for accelerating the body functionality in the process of special power training.
creator: Andrii Chernozub
creator: Veaceslav Manolachi
creator: Georgiy Korobeynikov
creator: Vladimir Potop
creator: Liudmyla Sherstiuk
creator: Victor Manolachi
creator: Ion Mihaila
uri: https://doi.org/10.7717/peerj.13827
license: https://creativecommons.org/licenses/by/4.0/
rights: ©2022 Chernozub et al.

title: Investigation of discriminatory attitude toward people living with HIV in the family context using socio-economic factors and information sources: A nationwide study in Indonesia
link: https://peerj.com/articles/13841
last-modified: 2022-08-03
description: BackgroundThe well-being of people living with HIV (PLHIV) remains a concern. In addition to facing discrimination in their communities, many PLHIV have family members who have a discriminatory attitude. This study analyzes the discriminatory attitude toward PLHIV in the family context using socio-economic factors and information sources in Indonesia.MethodsA cross-sectional study design was adopted using secondary data from the 2017 Indonesian Demographic Health Survey (IDHS). A total sample of 28,879 respondents was selected using two-stage stratified cluster sampling. The study variables are information sources, sex, age, education, residence, earnings, and familial discriminatory attitude. We used the STATA 16.1 software to analyze Chi-square and binary logistics with a 95% confident interval (CI) with a significance of 5% (p-value < 0.05).ResultsIn Indonesia, familial discriminatory attitude has a prevalence of 72.10%. In the survey, the respondents with access to some information about HIV (AOR: 0.794; 95% CI [0.722–0.873]), women (AOR: 0.768; 95% CI [0.718–0.820]), and those living in rural areas (AOR: 0.880; 95% CI [0.834–0.929]) were the least likely to have a familial discriminatory attitude. Meanwhile, the respondents aged 15–24 years (AOR: 1.329; 95% CI [1.118–1.581]) and those with a secondary level of education (AOR: 1.070; 95% CI [1.004–1.142]) were the most likely to have a familial discriminatory attitude.Conclusion.In the study, we found that, the younger the age and the lower the educational level of the respondent, the more likely they were to have a familial discriminatory attitude. The government may consider these factors when designing policies to tackle familial discrimination faced by PLHIV; in particular, education on HIV and AIDS should be promoted.
creator: Nursalam Nursalam
creator: Tintin Sukartini
creator: Heri Kuswanto
creator: Setyowati Setyowati
creator: Devi Mediarti
creator: Rosnani Rosnani
creator: Rifky Octavia Pradipta
creator: Masunatul Ubudiyah
creator: Dluha Mafula
creator: Sirikanok Klankhajhon
creator: Hidayat Arifin
uri: https://doi.org/10.7717/peerj.13841
license: https://creativecommons.org/licenses/by/4.0/
rights: © 2022 Nursalam et al.

title: Phytotoxic effects of Acacia saligna dry leachates on germination, seedling growth, photosynthetic performance, and gene expression of economically important crops
link: https://peerj.com/articles/13623
last-modified: 2022-08-02
description: The influence of dry leachates of Acasia saligna was tested on the seedling growth, photosynthesis, biochemical attributes, and gene expression of the economically important crops, including wheat (Triticum aestivum L.), radish (Raphanus sativus L.), barley (Hordeum vulgare L.) and arugula (Eruca sativa L.). Different concentrations (5%, 10%, 15%, 20%, and 25%) of stem extract (SE) and leaf extract (LE) of A. saligna were prepared, and seedlings were allowed to grow in Petri plates for 8 days. The results showed that all plant species exhibited reduced germination rate, plant height, and fresh and dry weight due to leachates extracts of A. saligna. Moreover, the activities of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), exhibited differential regulation due to the extract treatment. The SOD was increased with increasing the concentration of extracts, while CAT and APX activities were decreased with increasing the extract concentrations. In addition, leachate extract treatment decrease chlorophyll content, photosynthesis, PSII activity, and water use efficiency, with evident effects at their higher concentrations. Furthermore, the content of proline, sugars, protein, total phenols, and flavonoids were reduced considerably due to leachates extract treatments. Furthermore, seedlings treated with high concentrations of LE increased the expression of genes. The present results lead to the conclusion that A. saligna contains significant allelochemicals that interfere with the growth and development of the tested crop species and reduced the crops biomass and negatively affected other related parameters. However, further studies are suggested to determine the isolation and purification of the active compounds present in A. saligna extracts.
creator: Haifa Abdulaziz Sakit ALHaithloul
creator: Muhammad Ishfaq Khan
creator: Arafa Musa
creator: Mohammed M. Ghoneim
creator: Ayshah Aysh ALrashidi
creator: Imtiaz Khan
creator: Ehab Azab
creator: Adil A. Gobouri
creator: Mahmoud R. Sofy
creator: Mohamed El-Sherbiny
creator: Mona H. Soliman
uri: https://doi.org/10.7717/peerj.13623
license: https://creativecommons.org/licenses/by/4.0/
rights: © 2022 ALHaithloul et al.

title: Effectiveness of physical activity on immunity markers and quality of life in cancer patient: a systematic review
link: https://peerj.com/articles/13664
last-modified: 2022-08-02
description: BackgroundCancer is a huge group of diseases that can affect various body parts of humans but also has a psychological, societal, and economic impact. Physical activity can improve the quality of life (QOL) and immunity, while moderate intensity exercise can reduce the probability of this lethal disease. The current study aimed to determine the effect of physical activity on immune markers and QOL in cancer patients as well as to evaluate cancer-related fatigue (CRF) and its association with physical activity.MethodologyBefore starting the study, the study protocol was registered in PROSPERO (registration number CRD42021273292). An electronic literature search was performed by combining MeSH terminology and keywords used with the Boolean operators “OR” and “AND” to find relevant published studies on PubMed, Scopus, Cochrane, and ScienceDirect databases. The Joanna Briggs Institute (JBI) critical evaluation checklist was used to assess the quality of selected studies, while the GRADE approach was used to see the quality of evidence.ResultsA total of 13,931 studies were retrieved after the search on databases. After the scrutiny of studies by reading the title of articles and the inclusion/exclusion criteria, a total of 54 studies were selected for further screening by reading the full texts. In the final, a total of nine studies were selected for the current systematic review and proceeded for data extraction. The patients who were doing different exercises showed improvements in immunity, QOL, and reduction in CRF. A significant reduction in tumour necrosis factor-α (TNF-α), C reactive protein (CRP), interleukin-8 (IL-8), IL-6, and an increase in natural killer (NK) cells levels was also observed.ConclusionsThe exercise program is safe and beneficial to improve the quality of life and immunity markers before, during, and after cancer treatment. Physical exercise may also help patients to overcome the adverse effects of the treatment and to reduce the chance of developing new tumours in the future.
creator: Sameer Badri AL-Mhanna
creator: Wan Syaheedah Wan Ghazali
creator: Mahaneem Mohamed
creator: Ali A. Rabaan
creator: Eman Y. Santali
creator: Jeehan H. Alestad
creator: Enas Y. Santali
creator: Sohaib Arshad
creator: Naveed Ahmed
creator: Hafeez Abiola Afolabi
uri: https://doi.org/10.7717/peerj.13664
license: https://creativecommons.org/licenses/by/4.0/
rights: ©2022 AL-Mhanna et al.

title: Prevalence of sarcopenia was higher in women than in men: a cross-sectional study from a rural area in eastern China
link: https://peerj.com/articles/13678
last-modified: 2022-08-02
description: BackgroundThere were limited studies specifically evaluating whether the difference of the prevalence of sarcopenia exists in men and women in older adults from rural areas in China. The aim of this study was to compare the prevalence of sarcopenia between men and women in a rural area in eastern China and to explore the underlying causes.MethodsThis study included 1,105 participants aged 60-89 years. Muscle mass was measured by bio-electrical impedance analysis. Hand grip strength was measured by Jamar Hydraulic Hand Dynamometer. Sarcopenia was diagnosed according to the Asian Working Group for Sarcopenia-2019 Consensus. Data were analyzed using log-binomial and linear regression.ResultsThe prevalence of sarcopenia was 21.7% in women and 12.9% in men among the study cohort. After adjusting for age, education level, number of diseases, income level, smoking, drinking, and eating habits, proportion of people with sarcopenia was 1.49-fold greater in women than in men (PR = 1.49, 95% CI [1.01–2.26], P = 0.055).ConclusionsThe prevalence of sarcopenia in elderly women in this rural area of eastern China is higher than in men, suggesting that women in rural areas in China seem to be more vulnerable for sarcopenia, thus early screening and prevention need to be provided for them to address such gender disparity in health.
creator: Yichen Yang
creator: Qin Zhang
creator: Caihong He
creator: Jing Chen
creator: Danfeng Deng
creator: Wenwen Lu
creator: Yuming Wang
uri: https://doi.org/10.7717/peerj.13678
license: https://creativecommons.org/licenses/by/4.0/
rights: ©2022 Yang et al.

title: Differential gene expression analysis after DAPK1 knockout in hepatocellular carcinoma cells
link: https://peerj.com/articles/13711
last-modified: 2022-08-02
description: BackgroundThe mechanism through which death-associated protein kinase 1 (DAPK1) causes hepatocellular carcinoma (HCC) progression remains unclear. In this study, we aimed to identify key proteins that were altered after DAPK1 knockout.MethodsStable DAPK1 knockout HCC cell lines were established, then the differentially expressed genes (DEGs) of HCC were screened using the NetworkAnalyst database and enriched using the Metascape software. Protein-protein interaction networks (PPIs) were analyzed and visualized using the STRING database expansion.ResultsIn total, 732 differentially expressed genes were identified, including 415 upregulated genes and 317 downregulated genes. Through Cytoscape software scoring, 10 pivotal genes were found to be closely related to changes in DAPK1 expression; Kininogen-1 (KNG1), Complement C3 (C3), Metalloproteinase inhibitor 1 (TIMP1), and Alpha-2-HS-glycoprotein (AHSG) were the most strongly associated with DAPK1 expression changes. Moreover, western blot analysis results revealed that changes in the levels of proteins encoded by the four key genes after DAPK1 knockout were consistent with those seen in the database screening.ConclusionsThese results provide a direction for further studies on the DAPK1 gene and on the mechanism through which DAPK1 leads to hepatocellular carcinoma development.
creator: Yuanqi Li
creator: Hui Huang
creator: Huajun Yu
creator: Ting Mo
creator: Ting Wei
creator: Guodan Li
creator: Yufang Jia
creator: Xiaoqin Huang
creator: Mingjin Tu
creator: Xiuwen Yan
creator: Haitao Zhang
uri: https://doi.org/10.7717/peerj.13711
license: https://creativecommons.org/licenses/by/4.0/
rights: ©2022 Li et al.

title: Ray-finned fishes (Actinopterygii) from the Upper Jurassic (Oxfordian) of the Atacama Desert, Northern Chile
link: https://peerj.com/articles/13739
last-modified: 2022-08-02
description: This contribution presents novel records of ray-finned fishes from the Oxfordian of Cerritos Bayos, northern Chile. This includes a Pachycormiformes diversity represented by macropredatory forms (aff. Hypsocormus sp. and a still indeterminate form) and by suspension-feeding forms (Leedsichthys sp). The assemblage also includes the first Upper Jurassic local record of a Lepisosteidae, the latter being the oldest known to date in Gondwana. This diversity is complemented by new material of the lepidotid genus Scheenstia. The ray-finned fish assemblage from the Oxfordian of Cerritos Bayos is dominated by Lepisosteiformes and Pachycormiformes, complementing previous local coeval records from El Profeta Formation (ca. 250 km south from the localities here studied), mostly comprised by small Teleostei (e.g., Protoclupea chilensis, Varasichthys ariasi, Chongichthys dentatus, among others), indeterminate Pachycormiformes and Pycnodontiformes (Gyrodus sp.). The new records extend the known actinopterygian diversity from the Upper Jurassic of southeastern Panthalassa.
creator: Rodrigo A. Otero
uri: https://doi.org/10.7717/peerj.13739
license: https://creativecommons.org/licenses/by/4.0/
rights: © 2022 Otero