scholarly journals Feeding regimen modulates zebrafish behavior

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5343 ◽  
Author(s):  
Fernanda S. Dametto ◽  
Débora Fior ◽  
Renan Idalencio ◽  
João Gabriel S. Rosa ◽  
Michele Fagundes ◽  
...  
Keyword(s):  
Carbohydrate Metabolism ◽  
Danio Rerio ◽  
High Variability ◽  
Activity Level ◽  
Behavioral Changes ◽  
The Other ◽  
The Novel ◽  
Feeding Frequency ◽  
Tank Test ◽  
Feeding Regimen

Here we show that the feeding regimen modulates zebrafish (Danio rerio) behavior. With regard to the time elapsed between feeding and behavioral evaluation, fish fed 3 h before behavioral evaluation in the novel tank test (NTT) showed decreased activity and a trend toward an anxiolytic reaction (increased use of the upper section of the aquarium) in comparison to fish fed 0.5, 6, 12, 24 or 48 h before testing, although differences were not statistically significant for all comparisons. Activity and use of the upper section of the aquarium did not differ significantly among the other treatments. Regarding feeding frequency, fish fed once a day showed higher anxiety-like behavior (decreased use of the upper section of the aquarium) in comparison to fish fed twice a day, but feeding four or six times per day or only every second day did not result in differences from feeding twice a day. Feeding frequency had no effect on activity level. Metabolically, fish fed once a day presented decreased levels of glucose and glycogen and increased lactate when compared to the regular feeding (fish fed twice a day), suggesting that feeding regimen may modulate carbohydrate metabolism. Mechanistically, we suggest that the metabolic changes caused by the feeding regimen may induce behavioral changes. Our results suggest that the high variability of the results among different laboratories might be related to different feeding protocols. Therefore, if issues pertaining to the feeding regimen are not considered during experiments with zebrafish, erroneous interpretations of datasets may occur.

scholarly journals Chronic fluoxetine treatment of juvenile zebrafish (Danio rerio) does not elicit changes in basal cortisol levels and anxiety-like behavior in adulthood

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6407 ◽  
Author(s):  
Maureen L. Petrunich-Rutherford
Keyword(s):  
Young Adult ◽  
Danio Rerio ◽  
Behavioral Responses ◽  
The Novel ◽  
Adult Zebrafish ◽  
Juvenile Period ◽  
Basal Cortisol ◽  
Tank Test ◽  
Developmental Window

Exposure to selective serotonin reuptake inhibitors (SSRIs) during development may elicit long-term neuroadaptive changes that could alter the basal regulation of stress-associated physiological and behavioral processes later in life. Currently, the effects of juvenile fluoxetine exposure in rodent models appear to be dependent on the developmental window targeted as well as the duration of drug exposure. The zebrafish (Danio rerio) model is rapidly becoming a useful tool in pharmacological research and can be used to help elucidate some of the long-term effects of fluoxetine exposure prior to sexual maturation on neuroendocrine and behavioral stress markers. In the current study, juvenile zebrafish were chronically exposed to fluoxetine hydrochloride (0 or 100 μg/L) for 14 days (31–44 days post-fertilization (dpf)), then were left untreated until young adulthood. Starting at 90 dpf, basal neuroendocrine stress and behavioral responses of zebrafish were assessed. Cortisol was extracted from the young adult zebrafish body (trunk) and quantified via enzyme-linked immunosorbent assay (ELISA). Anxiety-like behaviors were assessed in response to introduction to the novel tank test. It was expected that juvenile exposure to fluoxetine would (1) reduce basal cortisol levels and (2) elicit anxiolytic effects in the novel tank test in adulthood. However, fluoxetine exposure during the juvenile period was not associated with alterations in basal levels of cortisol nor were there any significant changes in anxiety-like behavior in the young adult zebrafish. Thus, in zebrafish, it does not appear that SSRI exposure during the juvenile period has a long-term adverse or maladaptive impact on the basal expression of cortisol and anxiety-like behavior in adulthood. Further studies are needed to determine if SSRI exposure during this developmental window influences neuroendocrine and behavioral responses to acute stress.

Dioclea altissima seed lectin (DAL) prevents anxiety-like behavioral responses in adult zebrafish (Danio rerio): Involvement of GABAergic and 5-HT systems

2021 ◽  
Vol 20 ◽  
Author(s):  
João Ronielly Campêlo Araújo ◽  
Adriana Rolim Campos ◽  
Maria Kueirislene Amâncio Ferreira ◽  
Sacha Aubrey Alves Rodrigues Santos ◽  
Marina de Barros Mamede Vidal Damasceno ◽  
...  
Keyword(s):  
Danio Rerio ◽  
Structural Integrity ◽  
Behavioral Responses ◽  
Preference Test ◽  
The Novel ◽  
Latency Time ◽  
Adult Zebrafish ◽  
Plant Lectins ◽  
Gabaergic Receptors ◽  
Tank Test

Background: Plant lectins has shown promising neuropharmacological activities in animal models. Objective: This study evaluated the effect of Dioclea altissima seed lectin (DAL) on adult zebrafish behavior. Method: Zebrafish (n=6/group) were treated (i.p.; 20 µL) with DAL (0.025; 0.05 or 0.1 mg/mL), vehicle or diazepam (DZP) and submitted to several tests (open field, light/dark preference or novel tank). Flumazenil, pizotifen or granisetron were administered 15 min before DAL (0.05 mg/mL), and the animals were evaluated on light/dark preference test. It was also verified whether the DAL effect depended on its structural integrity and ability to interact with carbohydrates. Results: DAL decreased the locomotor activity of adult zebrafish (0.025; 0.05 or 0.1 mg/mL), increased the time spent in the upper region of the aquarium (0.025 mg/mL), and decreased the latency time of adult zebrafish to enter the upper region on the novel tank test. DAL (0.05 mg/mL) also increased their permanence in the light zone of the light/dark preference test. The effect of DAL was dependent on carbohydrate interaction and protein structure integrity and was prevented by pizotifen, granizetron and flumazenil. Conclusion: DAL was found to have an anxiolytic-like effect mediated by the 5-HT and GABAergic receptors.

scholarly journals Implantable cardioverter defibrillator multisensor monitoring during home confinement caused by the covid-19 pandemic

EP Europace ◽  
2021 ◽  
Vol 23 (Supplement_3) ◽  
Author(s):  
I Diemberger ◽  
F Guerra ◽  
L Calo" ◽  
A D"onofrio ◽  
M Manzo ◽  
...  
Keyword(s):  
Implantable Cardioverter Defibrillator ◽  
Activity Level ◽  
Behavioral Changes ◽  
The Other ◽  
Cardiac Resynchronization ◽  
Significant Drop ◽  
Cardioverter Defibrillator ◽  
Funding Sources ◽  
Index Value ◽  
Intrathoracic Impedance

Abstract Funding Acknowledgements Type of funding sources: None. Background Utilization of remote monitoring platforms was recommended amidst the COVID-19 pandemic. The HeartLogic algorithm combines data from multiple implantable cardioverter defibrillator (ICD) sensors (first and third heart sounds, intrathoracic impedance, respirations, night heart rate, and patient activity) to provide integrated data that may allow for detection of early signs of worsening HF. Purpose We examined whether the HeartLogic platform may elucidate behavioral changes that impact HF decompensation, and the possible consequences of home confinement caused by the COVID-19 pandemic. Methods The Italian lockdown was imposed from March 8th to May 18th. On March 8th 2020, the HeartLogic feature was active in 349 ICD and cardiac resynchronization therapy ICD patients at 20 Italian centers. The period from January 1st to July 19th was divided in 3 phases: Pre-Lockdown (weeks 1-11), Lockdown (weeks 12-20), Post-Lockdown (weeks 21-29). Results Immediately after the implementation of stay at home orders (week 12) we observed a significant drop in median activity level (65min [36-103] in week 12 vs. 101min [61-140] in Pre-Lockdown; p < 0.001), while there was no difference in the other contributing sensors. The median composite HeartLogic index increased at the end of Lockdown (4.7 [1.3-10.2] in week 20 vs. 2.5 [0.7-7.0] in Pre-Lockdown; p = 0.019). The weekly rate of HeartLogic alerts was significantly higher during Lockdown (1.56 alerts/week/100pts, 95%CI:1.15-2.06; IRR = 1.71, p = 0.014) and Post-Lockdown (1.37 alerts/week/100pts, 95%CI:0.99-1.84; IRR = 1.50, p = 0.072) than that reported in Pre-Lockdown (0.91 alerts/week/100pts, 95%CI:0.64-1.27). However, the median duration of alert state and the maximum index value did not change among phases, as well as the proportion of alerts followed by clinical actions at the centers (Pre-Lockdown: 31%, Lockdown: 22%, Post-Lockdown: 28%), and the proportion of alerts fully managed remotely (i.e. no in-clinic visits) (Pre-Lockdown: 89%, Lockdown: 90%, Post-Lockdown: 88%). Conclusions The system was sensitive to the behavioral changes occurred during the lockdown, i.e. decrease in activity. However, the home confinement had no impact on the other sensors. The higher rate of HeartLogic alerts during lockdown and the increase in the median index after 8 weeks of home confinement suggest the worsening of the HF status, possibly explained by the behavioral changes. Nonetheless, the management of the HF detected events (actions performed and management strategy) was not impacted by the restrictions.

scholarly journals Acute net stress of young adult zebrafish (Danio rerio) is not sufficient to increase anxiety-like behavior and whole-body cortisol

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7469 ◽  
Author(s):  
Amy Aponte ◽  
Maureen L. Petrunich-Rutherford
Keyword(s):  
Animal Model ◽  
Young Adult ◽  
Danio Rerio ◽  
Preference Test ◽  
Whole Body ◽  
The Novel ◽  
Adult Zebrafish ◽  
Handling Stress ◽  
Tank Test ◽  
Acute Stressor

In recent years, the zebrafish (Danio rerio) has become a popular model to study the mechanisms of physiological and behavioral effects of stress, due to the similarity in neural structures and biochemical pathways between zebrafish and mammals. Previous research in this vertebrate animal model has demonstrated an increase in whole-body cortisol resulting from an acute (30-second) net handling stress, but it remains unclear whether such a stressor will concomitantly increase anxiety-like behavior. In addition, as the previous study examined the effects of this acute stressor in adult zebrafish after a brief period of isolation, it is unclear whether this stressor would be effective in eliciting cortisol increases in younger aged subjects without isolation. In the current study, young adult zebrafish (approximately 90 days post-fertilization) were briefly exposed to a net handling stressor and were subsequently subjected to either the novel tank test or the light/dark preference test. The novel tank test was used to measure exploration and habituation in response to a novel environment, and the light/dark preference test was used to measure locomotor activity and scototaxis behavior. All subjects were sacrificed 15 minutes post-stressor and were analyzed for whole-body levels of cortisol. Contrary to expectations, there was no effect of acute net handling on cortisol levels. Similarly, acute net handling did not significantly induce anxiety-like behavior during the novel tank test or the light/dark preference test. Our findings demonstrate that there are possible developmental differences in response to an acute net handling stress, as we did not observe alterations in hormonal or behavioral measures of anxiety in young adult zebrafish. Alternatively, if zebrafish are not isolated before the stressor, they may be more resilient to a brief acute stressor. These results suggest the need for a different or more intense acute stressor in order further explore neuroendocrine mechanisms and anxiety-like behavior at this developmental stage in the zebrafish animal model.

Margaret Mahy: An Adlerian Reading

2008 ◽  
Vol 1 (2) ◽  
pp. 187-199
Author(s):  
KATHRYN WALLS
Keyword(s):  
Young Female ◽  
The Other ◽  
Individual Psychology ◽  
The Novel ◽  
Alfred Adler ◽  
Female Protagonists ◽  
Magical Power ◽  
Margaret Mahy ◽  
The Individual

According to the ‘Individual Psychology’ of Alfred Adler (1870–1937), Freud's contemporary and rival, everyone seeks superiority. But only those who can adapt their aspirations to meet the needs of others find fulfilment. Children who are rejected or pampered are so desperate for superiority that they fail to develop social feeling, and endanger themselves and society. This article argues that Mahy's realistic novels invite Adlerian interpretation. It examines the character of Hero, the elective mute who is the narrator-protagonist of The Other Side of Silence (1995) , in terms of her experience of rejection. The novel as a whole, it is suggested, stresses the destructiveness of the neurotically driven quest for superiority. Turning to Mahy's supernatural romances, the article considers novels that might seem to resist the Adlerian template. Focusing, in particular, on the young female protagonists of The Haunting (1982) and The Changeover (1984), it points to the ways in which their magical power is utilised for the sake of others. It concludes with the suggestion that the triumph of Mahy's protagonists lies not so much in their generally celebrated ‘empowerment’, as in their transcendence of the goal of superiority for its own sake.

KONSEP DIRI “ I “ DAN “ME” TOKOH HIROKO DALAM NOVEL NAMAKU HIROKO KARYA NH.DINI

2012 ◽  
Vol 5 (2) ◽  
pp. 109
Author(s):  
Besin Gaspar
Keyword(s):  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
The Novel ◽  
Main Character ◽  
Fictional Character ◽  
Social Customs ◽  
The Social ◽  
The Village ◽  
The City

This research deals with the development of  self concept of Hiroko as the main character in Namaku Hiroko by Nh. Dini and tries to identify how Hiroko is portrayed in the story, how she interacts with other characters and whether she is portrayed as a character dominated by ”I” element or  ”Me”  element seen  from sociological and cultural point of view. As a qualitative research in nature, the source of data in this research is the novel Namaku Hiroko (1967) and the data ara analyzed and presented deductively. The result of this analysis shows that in the novel, Hiroko as a fictional character is  portrayed as a girl whose personality  develops and changes drastically from ”Me”  to ”I”. When she was still in the village  l iving with her parents, she was portrayed as a obedient girl who was loyal to the parents, polite and acted in accordance with the social customs. In short, her personality was dominated by ”Me”  self concept. On the other hand, when she moved to the city (Kyoto), she was portrayed as a wild girl  no longer controlled by the social customs. She was  firm and determined totake decisions of  her won  for her future without considering what other people would say about her. She did not want to be treated as object. To put it in another way, her personality is more dominated by the ”I” self concept.

Wacana Kolonial dalam Novel Max Havelaar: Sebuah Kajian Poskolonial

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 411
Author(s):  
Abu Bakar Ramadhan Muhamad
Keyword(s):  
Point Of View ◽  
The Other ◽  
The Novel ◽  
Colonial Discourse ◽  
The Impact ◽  
The Voice

AbstrakHegemoni kolonialisme dalam budaya poskolonial merupakan alasan penelitian inikemudian mengkaji wacana kolonial dalam novel Max Havellar (MH) khususnya dampakditimbulkannya. Dampak dimaksud adalah posisi keberpihakan pemikiran tersirat darikarya tersebut. Hasil pembahasan menunjukkan, secara temporal maupun permanen MHmenyuarakan ketidakadilan dalam kondisi-kondisi kolonial menyangkut penindasan sangpenjajah terhadap terjajah. Hanya saja, upaya mengatasnamakan atau mewakili suarakaum terjajah terbukti mengimplikasikan ciri ideologis statis kerangka kolonialisme(orientalisme); yakni cara pandang Eropasentris, di mana “Barat” sebagai self adalah superior,dan “Timur” sebagai other adalah inferior. Dalam konteks poskolonialisme, MH dengan sifatkritisnya yang berupaya “menyuarakan” nasib pribumi terjajah, justru menampilkan stigmapenguatan kolonialitas itu sendiri secara hegemonik. Artinya, “menyuarakan” nasib pribumidimaknai sebagai keberpihankan kolonial yang kontradiktif, di mana stigma penguatankolonialitas justru lebih terasa, ujung-ujungnya melanggengkan hegemoni kolonial. Tidakmembela yang terjajah, tetapi memperhalus cara kerja mesin kolonial.AbstractThe hegemony of colonialism in the culture of postcolonial society is the reason this studythen examines the colonial discourse in the novel Max Havellar (MH) in particular the impactit brings. The impact in question is the implied position of thought in the work. The resultsof the discussion show that, temporarily or permanently, MH voiced injustice in the colonialconditions regarding the oppression of the colonist against the colonized. However, the effort toname or represent the voice of the colonized has proven to imply a static ideological characterin the framework of colonialism (orientalism); ie Eropacentric point of view, in which “West” asself is superior, and “East” as the other is the inferior. In the context of postcolonialism, MH withits critical nature that seeks to “voice” the fate of the colonized natives, actually presents thestigma of strengthening coloniality itself hegemonicly. That is, “voicing” the fate of the pribumiis interpreted as a contradictory colonial flare, where the stigma of strengthening colonialityis more pronounced, which ultimately perpetuates the hegemony of colonialism. No longerdefending the colonized, but refining the workings of the colonial machinery.

Identifying Ethics: Dysfunction as Representation of Societal Relationship in Ian McEwans’s Sweet Tooth

Think India ◽  
2019 ◽  
Vol 22 (2) ◽  
pp. 1-6
Author(s):  
A. Yacob ◽  
S. Veeramani
Keyword(s):  
Code Of Conduct ◽  
The Self ◽  
The Other ◽  
Ethical Code ◽  
The Novel ◽  
Field Of Study ◽  
Research Article ◽  
Ian Mcewan

In the novel, Sweet Tooth, McEwan has employed an ethical code of conduct called, Dysfunction of Relationship. The analysis shows that he tries to convey something extraordinary to the readers. If it is not even the reader to understand such a typical thing, He himself represents a new ethical code of conduct. The character of the novel, Serena is almost a person who is tuned to such a distinct one. It is clear that the character of this type is purely representational. Understanding reality based on situation and ethics has been a new field of study in terms of Post- Theory. Intervening to such aspect of Interpretation, this research article establishes a new study in the writings of Ian McEwan. In the novel, Dysfunction is not on the ‘Self’ but it is on the ‘Other’. The author tries to integrate the function of the Character Serena, instead of fragmenting the self. Hence, Fragmentation makes sense only in the dysfunction of relationship.

Do we form or deform? Qualitative Investigation in Public Hospitals of Madrid

2019 ◽  
Author(s):  
María Jesús Gómez Camuñas ◽  
Purificación González Villanueva
Keyword(s):  
Participant Observation ◽  
Scientific Evidence ◽  
Theory And Practice ◽  
Public Hospitals ◽  
The Other ◽  
The Novel ◽  
Business Growth ◽  
Small Hospital ◽  
Student Learn ◽  
Depth Interviews

<div><i>Background</i>: the creative capacities and the knowledge of the employees are components of the intellectual capital of the company; hence, their training is a key activity to achieve the objectives and business growth. <i>Objective</i>: To understand the meaning of learning in the hospital from the experiences of its participants through the inquiry of meanings. <i>Method</i>: Qualitative design with an ethnographic approach, which forms part of a wider research, on organizational culture; carried out mainly in 2 public hospitals of the Community of Madrid. The data has been collected for thirteen months. A total of 23 in-depth interviews and 69 field sessions have been conducted through the participant observation technique. <i>Results</i>: the worker and the student learn from what they see and hear. The great hospital offers an unregulated education, dependent on the professional, emphasizing that they learn everything. Some transmit the best and others, even the humiliating ones, use them for dirty jobs, focusing on the task and nullifying the possibility of thinking. They show a reluctant attitude to teach the newcomer, even if they do, they do not have to oppose their practice. In short, a learning in the variability, which produces a rupture between theory and practice; staying with what most convinces them, including negligence, which affects the patient's safety. In the small hospital, it is a teaching based on a practice based on scientific evidence and personalized attention, on knowing the other. Clearly taught from the reception, to treat with caring patience and co-responsibility in the care. The protagonists of both scenarios agree that teaching and helping new people establish lasting and important personal relationships to feel happy and want to be in that service or hospital. <i>Conclusion</i>: There are substantial differences related to the size of the center, as to what and how the student and the novel professional are formed. At the same time that the meaning of value that these health organizations transmit to their workers is inferred through the training, one orienting to the task and the other to the person, either patient, professional or pupil and therefore seeking the common benefit.</div>

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