scholarly journals Embryonic exposure to predator odour modulates visual lateralization in cuttlefish

2013 ◽  
Vol 280 (1752) ◽  
pp. 20122575 ◽  
Author(s):  
Christelle Jozet-Alves ◽  
Marie Hébert
Keyword(s):  
Prey Species ◽  
Early Experience ◽  
Embryonic Exposure ◽  
Surrounding Environment ◽  
Embryonic Life ◽  
Environmental Stimulation ◽  
High Predation ◽  
First Time ◽  
Predator Odour ◽  
Stimulation Of

Predation pressure acts on the behaviour and morphology of prey species. In fish, the degree of lateralization varies between high- and low-predation populations. While lateralization appears to be widespread in invertebrates, we do not know whether heredity and early experience interact during development as in vertebrates. Here we show, for the first time, that an exposure to predator odour prior to hatching modulates visual lateralization in newly hatched cuttlefish. Only cuttlefish that have been exposed to predator odour display a left-turning bias when tested with blank seawater in a T-shaped apparatus. Exposure to predator odour all the incubation long could appear as an acute predictor of a high-predation surrounding environment. In addition, cuttlefish of all groups display a left-turning preference when tested with predator odour in the apparatus. This suggests the ability of cuttlefish to innately recognize predator odour. To our knowledge, this is the first clear demonstration that lateralization is vulnerable to ecological challenges encountered during embryonic life, and that environmental stimulation of the embryo through the olfactory system could influence the development of subsequent visual lateralization.

scholarly journals Parents know best: transgenerational predator recognition through parental effects

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9340
Author(s):  
Jennifer A. Atherton ◽  
Mark I. McCormick
Keyword(s):  
Prey Species ◽  
Environmental Changes ◽  
Species Recognition ◽  
Mortality Rates ◽  
Parental Effects ◽  
Predator Treatment ◽  
Parental Exposure ◽  
Specific Predator ◽  
First Time ◽  
Predator Odour

In highly biodiverse systems, such as coral reefs, prey species are faced with predatory threats from numerous species. Recognition of predators can be innate, or learned, and can help increase the chance of survival. Research suggests that parental exposure to increased predatory threats can affect the development, behaviour, and ultimately, success of their offspring. Breeding pairs of damselfish (Acanthochromis polyacanthus) were subjected to one of three olfactory and visual treatments (predator, herbivore, or control), and their developing embryos were subsequently exposed to five different chemosensory cues. Offspring of parents assigned to the predator treatment exhibited a mean increase in heart rate two times greater than that of offspring from parents in herbivore or control treatments. This increased reaction to a parentally known predator odour suggests that predator-treated parents passed down relevant threat information to their offspring, via parental effects. This is the first time transgenerational recognition of a specific predator has been confirmed in any species. This phenomenon could influence predator-induced mortality rates and enable populations to adaptively respond to fluctuations in predator composition and environmental changes.

Kegiatan pembelajaran sebagai upaya dalam menstimulus perkembangan sosial-emosional anak usia dini

2020 ◽  
Vol 3 (1) ◽  
pp. 43-57
Author(s):  
Aghnaita Aghnaita ◽  
Ajeng Almira Salsabila ◽  
Camelia Hanik ◽  
Maulida Syafitri ◽  
Norhayani Norhayani ◽  
...  
Keyword(s):  
Early Childhood ◽  
Social Development ◽  
Emotional Development ◽  
Learning Activities ◽  
Primary Data ◽  
Social Emotional ◽  
Cultural Backgrounds ◽  
Childhood Education ◽  
Surrounding Environment ◽  
Stimulation Of

This study aims to determine the emotional social development of early childhood in Integrated Early Childhood Education Tarbiyatul Athfal UIN Antasari Banjarmasin as well as the form of learning activities undertaken as an effort to stimulate the emotional social development. The research method used is qualitative research on 6 children and learning activities that can stimulate children's emotional emotional development as primary data. Based on research conducted, the results obtained that the child's emotional social development tends to be unstable. Children often prefer to play alone. Nevertheless, children also begin to show interest in hanging out in the surrounding environment and doing play activities together. In addition, there are several factors influence, such as: social emotional experiences of children, gender differences, differences in family and cultural backgrounds, and parenting. While the form of learning activities that are pursued in the form of stimulation of children's emotional social development include: routine activities of reading Asmaul Husna and short surahs, filling in journals, playing indoor, and conducting learning activities. The activity was carried out through exemplary methods, sharing learning, and collaborative games.

First Multistage Hydraulic Fracturing in Russian Offshore: Integrated Approach to Completion and Stimulation of Apt Deposits of V.Filanovsky Field

2021 ◽  
Author(s):  
Mikhail Yurievich Golenkin ◽  
Denis Vladimirovich Eliseev ◽  
Alexander Anatolyevich Zemchikhin ◽  
Alexey Alexandrovich Borisenko ◽  
Akhmat Sakhadinovich Atabiyev ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Caspian Sea ◽  
Complex Type ◽  
The Caspian Sea ◽  
Multistage Hydraulic Fracturing ◽  
Coiled Tubing ◽  
Sand Control ◽  
Friction Reducing ◽  
First Time ◽  
Stimulation Of

Abstract The paper describes the results of the first multistage hydraulic fracturing operations in Russia on the Caspian Sea shelf in the gas condensate and oil deposits of the Aptian formation of V. Filanovsky field. In addition to the small productive formation depth, long horizontal sections with a complex trajectory and high collapse gradients due to large zenith angles when passing the Albian and Aptian deposits of poorly consolidated sandstones are an additional challenge for choosing a multistage hydraulic fracturing assembly. The above features require the use of modern sand control screens with enhanced frac sleeves. A design was developed which includes frac sleeves and sand control screens that can withstand multiple cycles of hydraulic impact during hydraulic fracturing, as well as many opening/closing cycles. A seawater-based frac fluid system was applied. The frac fleet was located on a pontoon, the coiled tubing – on a platform. For the first time in Russia, a 2-5/8 inch coiled tubing with a complex-type friction reducing system was used to switch coupling/sleeves in conditions of very long horizontal sections, complex trajectories, and high friction coefficients. The minimum distances between the screen's sliding sleeves and frac sleeves did not prevent from performing manipulations in complex environment. For well cleaning, the frac assemblies of reverse rotary-pulse and rotary-directional types were used. At the first stage of the project, the development of an optimal method of well completion was successfully implemented. Due to the close interaction of the operating company, service company, and science & engineering team of the operator, for the first time in Russia the design of downhole equipment with the use of advanced technologies of sand control screens, frac sleeves was presented. This solution has proved its effectiveness – the downhole equipment has retained its operational properties after a long period of well operation and further in the process of hydraulic fracturing. At the second stage of the project, 32 MSHF operations were performed at four wells. To reduce nonproductive time and operational risks, a satellite communication complex was additionally deployed on the pontoon to join the engineering centers of Astrakhan, Moscow, and Houston. After finishing the well development, the design indicators for formation fluid rates were achieved, which proved the effectiveness of the stimulation of the field's target objects – this opens great prospects for further development of low-permeability reservoirs at offshore sites in the Caspian Sea. The successful project implementation and the achievement of the design values of oil flow rates has expanded the possibilities of commercial operation of the low-permeable Aptian formation, complicated by the presence of a gas cap and underlying water. A solution was presented for working in extended horizontal well sections with 2-5/8 inch coiled tubing together with a complex-type mechanical friction reducing system. The economic effect was achieved when solving tasks of manipulating mechanical screen couplings and frac port sleeves without the involvement of downhole tractors. The use of new solutions in the completion assembly made it possible to eliminate additional sand ingress problems.

scholarly journals Peripheral O2 chemoreceptors mediate humoral catecholamine secretion from fish chromaffin cells

2003 ◽  
Vol 284 (4) ◽  
pp. R990-R999 ◽  
Author(s):  
Stephen G. Reid ◽  
Steve F. Perry
Keyword(s):  
Oncorhynchus Mykiss ◽  
Chromaffin Cells ◽  
Sodium Cyanide ◽  
Gill Arch ◽  
External Water ◽  
Water Sensing ◽  
First Time ◽  
Cardiorespiratory Reflexes ◽  
Catecholamine Levels ◽  
Stimulation Of

This study addressed the hypothesis that the secretion of catecholamines from trout ( Oncorhynchus mykiss) chromaffin cells, during hypoxia, is triggered by stimulation of O2 chemoreceptors located within the gills. Sodium cyanide was administered into the inspired water (external cyanide) or injected into the gill circulation (internal cyanide) to pharmacologically stimulate external (water sensing) or internal (blood sensing) O2 chemoreceptors, respectively. Both of these treatments caused an elevation of circulating catecholamine levels. The response to external, but not internal, cyanide was abolished by removal of the first gill arch. Hypoxia produced an increase in circulating catecholamine levels that was unaffected by removal of the first gill arch or by denervation of the pseudobranch. Cyanide and hypoxia both caused the well-documented cardiorespiratory reflexes normally observed in this species. This study demonstrates, for the first time, that gill O2chemoreceptors can initiate the reflex that leads to catecholamine release from the chromaffin cells and that stimulation of internally oriented O2 receptors on all gill arches appears to be the physiologically important mechanism for initiating release.

Load Signals Assist the Generation of Movement-Dependent Reflex Reversal in the Femur–Tibia Joint of Stick Insects

2006 ◽  
Vol 96 (6) ◽  
pp. 3532-3537 ◽  
Author(s):  
Turgay Akay ◽  
Ansgar Büschges
Keyword(s):  
Time Course ◽  
Stick Insect ◽  
Motor Output ◽  
Chordotonal Organ ◽  
Frequency Of Occurrence ◽  
Stick Insects ◽  
Extensor Motoneuron ◽  
Motoneuron Activity ◽  
First Time ◽  
Stimulation Of

Reinforcement of movement is an important mechanism by which sensory feedback contributes to motor control for walking. We investigate how sensory signals from movement and load sensors interact in controlling the motor output of the stick insect femur–tibia (FT) joint. In stick insects, flexion signals from the femoral chordotonal organ (fCO) at the FT joint and load signals from the femoral campaniform sensilla (fCS) are known to individually reinforce stance-phase motor output of the FT joint by promoting flexor and inhibiting extensor motoneuron activity. We quantitatively compared the time course of inactivation in extensor tibiae motoneurons in response to selective stimulation of fCS and fCO. Stimulation of either sensor generates extensor activity in a qualitatively similar manner but with a significantly different time course and frequency of occurrence. Inactivation of extensor motoneurons arising from fCS stimulation was more reliable but more than threefold slower compared with the extensor inactivation in response to flexion signals from the fCO. In contrast, simultaneous stimulation of both sense organs produced inactivation in motoneurons with a time course typical for fCO stimulation alone, but with a frequency of occurrence characteristic for fCS stimulation. This increase in probability of occurrence was also accompanied by a delayed reactivation of the extensor motoneurons. Our results indicate for the first time that load signals from the leg affect the processing of movement-related feedback in controlling motor output.

scholarly journals CORTICOTROPINS (ACTH)

1957 ◽  
Vol 105 (4) ◽  
pp. 335-360 ◽  
Author(s):  
Choh Hao Li ◽  
Peter Fønss-Bech ◽  
Irving I. Geschwind ◽  
Tetsuo Hayashida ◽  
Gerald F. Hungerford ◽  
...  
Keyword(s):  
Biological Effects ◽  
Male Rats ◽  
Accessory Sex Glands ◽  
Inhibition Of Growth ◽  
Biological Responses ◽  
Lactogenic Hormone ◽  
Hypophysectomized Rats ◽  
Growth Promoting ◽  
First Time ◽  
Stimulation Of

Purified α-corticotropin has been reported to exercise the following biological effects: (a) stimulation of the adrenal glands in normal and hypophysectomized rats, (b) production of blood eosinopenia in hypophysectomized rats, (c) maintenance of muscle glycogen in hypophysectomized rats, (d) inhibition of growth-promoting activity of somatotropin, (e) stimulation of melanocytes in the skin of frogs, (f) mobilization of fat into the liver of fasted mice, (g) stimulation of the accessory sex glands of castrated-hypophysectomized male rats, (h) induction of deciduoma formation in hypophysectomized-oophorectomized rats, and (i) elevation of the total red cell volume in hypophysectomized rats. α-Corticotropin has also been shown for the first time to act in synergism with lactogenic hormone as an essential galactopoietic hormone. The ability of α-corticotropin to elicit biological responses in the absence of the adrenal cortex is discussed.

ApoE4 impairs hippocampal plasticity isoform-specifically and blocks the environmental stimulation of synaptogenesis and memory

2003 ◽  
Vol 13 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Ofir Levi ◽  
Ana L Jongen-Relo ◽  
Joram Feldon ◽  
Allen D Roses ◽  
Daniel M Michaelson
Keyword(s):  
Hippocampal Plasticity ◽  
Environmental Stimulation ◽  
Stimulation Of

scholarly journals Corticotropin-Releasing Hormone and Its Structurally Related Urocortin Are Synthesized and Secreted by Human Mast Cells

Endocrinology ◽  
2004 ◽  
Vol 145 (1) ◽  
pp. 43-48 ◽  
Author(s):  
Duraisamy Kempuraj ◽  
Nikoletta G. Papadopoulou ◽  
Michael Lytinas ◽  
Man Huang ◽  
Kristiana Kandere-Grzybowska ◽  
...  
Keyword(s):  
Mast Cells ◽  
Immune Responses ◽  
Restraint Stress ◽  
Acute Stress ◽  
Rt Pcr ◽  
Human Cord Blood ◽  
Potential Source ◽  
First Time ◽  
Pituitary Adrenal Axis ◽  
Stimulation Of

Abstract Stress activates the hypothalamic-pituitary-adrenal axis through CRH, leading to production of glucocorticoids that down-regulate immune responses. However, acute stress also has proinflammatory effects. We previously showed that restraint stress, as well as CRH and its structurally related urocortin (Ucn), could activate mast cells and trigger mast cell-dependent vascular permeability. Here we show for the first time that human cord blood-derived cultured mast cells (hCBMC) at 10 wk, but not at 2 wk, are immunocytochemically positive for CRH and Ucn; human leukemic mast cells are weakly positive for both peptides. The ability of these mast cells to synthesize CRH and Ucn was confirmed by showing mRNA expression with RT-PCR. hCBMC (8–14 wk) synthesize and store 1–10 ng/106 cells (10–20 μg/g) of both CRH and Ucn detected by ELISA of cell homogenates. Stimulation of IgE-sensitized hCBMC with anti-IgE results in secretion of most CRH and Ucn. These findings indicate that mast cells are not only the target, but also a potential source of CRH and Ucn that could have both autocrine and paracrine functions, especially in allergic inflammatory disorders exacerbated by stress.

scholarly journals beta-Naphthoflavone abolishes interrenal sensitivity to ACTH stimulation in rainbow trout

1998 ◽  
Vol 157 (1) ◽  
pp. 63-70 ◽  
Author(s):  
JM Wilson ◽  
MM Vijayan ◽  
CJ Kennedy ◽  
GK Iwama ◽  
TW Moon
Keyword(s):  
Cytochrome P450 ◽  
Rainbow Trout ◽  
Acth Stimulation ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Treated Fish ◽  
First Time ◽  
Hepatic Cytochrome ◽  
Stimulation Of

We report for the first time that beta-naphthoflavone (BNF) abolishes ACTH stimulation of cortisol production in rainbow trout (Oncorhynchus mykiss). There was significantly higher hepatic cytochrome P450 content and ethoxyresorufin O-de-ethylase and uridine-5'-diphosphoglucuronic acid transferase activities in BNF-treated fish than in sham-treated controls. BNF did not significantly affect either plasma turnover or tissue distribution of [3H]cortisol-derived radioactivity. Hepatic membrane fluidity and hepatocyte capacity for cortisol uptake were not altered by BNF as compared with the sham-treated fish. These results taken together suggest that BNF does not affect cortisol-clearance mechanisms in trout. A 3 min handling disturbance period elicited a plasma cortisol response in the sham-treated fish; however, the response in the BNF-treated fish was muted and significantly lower than in the sham fish. This in vivo response corroborates the lack of interrenal sensitivity to ACTH in vitro in the BNF-treated fish, suggesting that BNF affects the ACTH pathway in trout. Our results suggest the possibility that cytochrome P450-inducing compounds may affect cortisol dynamics by decreasing interrenal responsiveness to ACTH stimulation in fish, thereby impairing the physiological responses that are necessary for the animal to cope with the stressor.

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