Développement postnatal de l'activité motrice chez Microtus pennsylvanicus

1978 ◽  
Vol 56 (5) ◽  
pp. 1092-1102 ◽  
Author(s):  
François-Marie Pépin ◽  
Georg Baron
Keyword(s):  
Temporal Distribution ◽  
Microtus Pennsylvanicus ◽  
The Body ◽  
Transitional Stage ◽  
Developmental Sequences ◽  
Three Stages ◽  
Tunnel System ◽  
First Time

Three litters of Microtus pennsylvanicus were observed in an artificial tunnel system from birth to 21 days of age. Isolated movements, positions and rotations of the body, and linear locomotion were recorded. Movements could be classified into three stages or five periods based on their first appearance. 'Nest' stage (0–7 days) with period I (0–2 days) in which most isolated movements and rotations occurred and period II (3–7 days) which was characterized by 'crawling'; the 'transitional' stage (8–10 days) or period III in which the pups left the nest for the first time; the 'outside of nest' stage (11–21 days) which included period IV (11–12 days), characterized by coordinated walking and frequent visits to the tunnels, and period V (from 13 days on) in which the animals visited the surface and mastered the basic locomotory repertoire found in adults. Development of rotation movements could also be divided into four distinct periods based on the relative frequencies of their occurrence. Although they are based on different criteria, the two types of developmental sequences give basically the same temporal distribution.

scholarly journals The body plan of Halszkaraptor escuilliei (Dinosauria, Theropoda) is not a transitional form along the evolution of dromaeosaurid hypercarnivory

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8672 ◽  
Author(s):  
Andrea Cau
Keyword(s):  
State Transition ◽  
Body Plan ◽  
The Body ◽  
Large Majority ◽  
Character State ◽  
Transitional Stage ◽  
Morphological Divergence ◽  
Transitional Form ◽  
Phylogenetic Framework ◽  
First Time

The dromaeosaurid theropod Halszkaraptor escuilliei is characterized by several unusual features absent in other paravians, part of which has been interpreted as diagnostic of a novel lineage adapted to a semiaquatic ecology. Recently, these evolutionary and ecological interpretations have been challenged, and Halszkaraptor has been claimed to be a transitional form between non-dromaeosaurid maniraptoriforms and other dromaeosaurids: following that reevaluation, its peculiar body plan would represent the retention of several maniraptoran plesiomorphies, lost among other dromaeosaurids, and not an adaptation to a novel ecology. This alternative scenario is here carefully investigated and tested. It is shown that most statements supporting this scenario are based on misinterpretation of anatomical traits and bibliography. Once these statements have been corrected, character state transition optimization over a well-supported phylogenetic framework indicates that the large majority of the peculiar features of the Halszkaraptor lineage are derived novelties acquired by the latter after its divergence from the last ancestor shared with eudromaeosaurs, and thus are not maniraptoriform plesiomorphies. At least seven novelties of the Halszkaraptor lineage are convergently acquired with spinosaurids, and are integrated in semiaquatic adaptations: one of these is reported here for the first time. The amount of morphological divergence of Halszkaraptorinae from the ancestral dromaeosaurid condition is comparable to those of Microraptorinae and Velociraptorinae. Among extant taxa, the sawbills (Mergini, Anseriformes) show the closest ecomorphological similarity with the peculiar body plan inferred for Halszkaraptor. The halszkaraptorine bauplan is thus confirmed as a derived amphibious specialization, and does not represent a “transitional” stage along the evolution of dromaeosaurids.

scholarly journals PARAMETERS OF THE FECUNDITY OF AMPHIPOD CRUSTACEAN ALIEN SPECIES (CRUSTACEA, AMPHIPODA) FROM WATERCOURSES OF BELARUS

2018 ◽  
Vol 63 (3) ◽  
pp. 365-373 ◽  
Author(s):  
A. I. Makaranka
Keyword(s):  
Alien Species ◽  
Body Length ◽  
Sexual Maturation ◽  
Age Groups ◽  
Climatic Conditions ◽  
The Body ◽  
Amphipod Crustacean ◽  
Three Stages ◽  
First Time ◽  
Relative Fertility

For the first time for water bodies of Belarus, based on studies (2008–2015), the main fertility parameters for eight alien species of amphipods were established . The minimum sizes of individuals for which identification of sex and the size of sexual maturation is possible are presented. The ranges of the body length of the egg-bearing females and the average sizes of the breeding individuals were determinate. The sizes and number of eggs are given at three stages of development for females of different age groups. Absolute and relative fertility were revealed. It is established that the number of eggs in the brood bag correlates with the size and weight of the female; the dependences of fecundity on the length and weight of the female were calculated. The theoretical possible number of litters in the period of reproduction of animals in the conditions of the obtained range was determined. The obtained results differed insignificantly with the literature data from regions with similar climatic conditions, that was determined mainly by various ecological conditions.

scholarly journals Electro-Quasistatic Animal Body Communication for Untethered Rodent Biopotential Recording

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shreeya Sriram ◽  
Shitij Avlani ◽  
Matthew P. Ward ◽  
Shreyas Sen
Keyword(s):  
Lower Energy ◽  
Sensor Node ◽  
State Of The Art ◽  
The Body ◽  
Animal Body ◽  
Current State ◽  
Communication Modalities ◽  
First Time ◽  
Biopotential Recording

AbstractContinuous multi-channel monitoring of biopotential signals is vital in understanding the body as a whole, facilitating accurate models and predictions in neural research. The current state of the art in wireless technologies for untethered biopotential recordings rely on radiative electromagnetic (EM) fields. In such transmissions, only a small fraction of this energy is received since the EM fields are widely radiated resulting in lossy inefficient systems. Using the body as a communication medium (similar to a ’wire’) allows for the containment of the energy within the body, yielding order(s) of magnitude lower energy than radiative EM communication. In this work, we introduce Animal Body Communication (ABC), which utilizes the concept of using the body as a medium into the domain of untethered animal biopotential recording. This work, for the first time, develops the theory and models for animal body communication circuitry and channel loss. Using this theoretical model, a sub-inch$$^3$$ 3 [1″ × 1″ × 0.4″], custom-designed sensor node is built using off the shelf components which is capable of sensing and transmitting biopotential signals, through the body of the rat at significantly lower powers compared to traditional wireless transmissions. In-vivo experimental analysis proves that ABC successfully transmits acquired electrocardiogram (EKG) signals through the body with correlation $$>99\%$$ > 99 % when compared to traditional wireless communication modalities, with a 50$$\times$$ × reduction in power consumption.

scholarly journals Experiential ownership and body ownership are different phenomena

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Caleb Liang ◽  
Wen-Hsiang Lin ◽  
Tai-Yuan Chang ◽  
Chi-Hong Chen ◽  
Chen-Wei Wu ◽  
...  
Keyword(s):  
Conscious Experience ◽  
Distinct Type ◽  
Body Part ◽  
The Body ◽  
Body Ownership ◽  
Rubber Hand ◽  
Person Perspective ◽  
The One ◽  
First Time ◽  
Full Body

AbstractBody ownership concerns what it is like to feel a body part or a full body as mine, and has become a prominent area of study. We propose that there is a closely related type of bodily self-consciousness largely neglected by researchers—experiential ownership. It refers to the sense that I am the one who is having a conscious experience. Are body ownership and experiential ownership actually the same phenomenon or are they genuinely different? In our experiments, the participant watched a rubber hand or someone else’s body from the first-person perspective and was touched either synchronously or asynchronously. The main findings: (1) The sense of body ownership was hindered in the asynchronous conditions of both the body-part and the full-body experiments. However, a strong sense of experiential ownership was observed in those conditions. (2) We found the opposite when the participants’ responses were measured after tactile stimulations had ceased for 5 s. In the synchronous conditions of another set of body-part and full-body experiments, only experiential ownership was blocked but not body ownership. These results demonstrate for the first time the double dissociation between body ownership and experiential ownership. Experiential ownership is indeed a distinct type of bodily self-consciousness.

scholarly journals Normalizing Vision: The Representation and Use of Spectacles and Eyeglasses in Victorian Britain

2021 ◽  
Author(s):  
Gemma Almond
Keyword(s):  
Assistive Technology ◽  
Cultural Context ◽  
Assistive Technologies ◽  
The Body ◽  
Visual Aids ◽  
Medical Texts ◽  
Victorian Britain ◽  
Victorian Period ◽  
First Time ◽  
Material Evidence

Abstract This study explores the representation and use of Victorian visual aids, specifically focusing on how the design of spectacle and eyeglass frames shaped ideas of the ‘normal’ and ‘abnormal’ body. It contributes to our understanding of assistive technologies in the Victorian period by showcasing the usefulness of material evidence for exploring how an object was produced and perceived. By placing visual aids in their medical and cultural context for the first time, it will show how the study of spectacle and eyeglass frames develops our understanding of Victorian society more broadly. Contemporaries drew upon industrialization, increasing education, and the proliferation of print to explain a rise in refractive vision ‘errors’. Through exploring the design of three spectacle frames from the London Science Museum’s collections, this study will show how the representations and manufacture of visual aids transformed in response to these wider changes. The material evidence, as well as contemporary newspapers, periodicals, and medical texts, reveal that visual aids evolved from an unusual to a more mainstream device. It argues that visual aids are a unique assistive technology, one that is able to inform our understanding of how Victorians measured the body and constructed ideas of ‘normalcy’ and ‘abnormalcy’.

scholarly journals Structural, Superconducting and Magnetic Properties of La3-XRxNi2B2N3-δ with R = Ce, Pr, Nd

2011 ◽  
Vol 170 ◽  
pp. 165-169 ◽  
Author(s):  
Tahir Ali ◽  
Ernst Bauer ◽  
Gerfried Hilscher ◽  
Herwig Michor
Keyword(s):  
Magnetic Properties ◽  
Structure Type ◽  
The Body ◽  
Spin Reorientation ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order ◽  
First Time ◽  
Magnetic Pair

We report on structural and superconducting properties of La3-xRxNi2B2N3- where La is substituted by the magnetic rare-earth elements Ce, Pr, Nd. The compounds Pr3Ni2B2N3- and Nd3Ni2B2N3- are characterized for the first time. Powder X-ray diffraction confirmed all samples R3Ni2B2N3- with R = La, Ce, Pr, Nd and their solid solutions to crystallize in the body centered tetragonal La3Ni2B2N3 structure type. Superconducting and magnetic properties of La3-xRxNi2B2N3- were studied by resistivity, specific heat and susceptibility measurements. While La3Ni2B2N3- has a superconducting transition temperature Tc ~ 14 K, substitution of La by Ce, Pr, and Nd leads to magnetic pair breaking and, thus, to a gradual suppression of superconductivity. Pr3Ni2B2N3- exibits no long range magnetic order down to 2 K, Nd3Ni2B2N3- shows ferrimagnetic ordering below TC =17 K and a spin reorientation transition to a nearly antiferromagnetic state at 10 K.

MICROSCOPIC CHANGES IN THE INTERNAL ORGANS OF WHITE MICE DURING EXPERIMENTAL IRON (IV) CLATHROCHELATE TOXICOSIS

2021 ◽  
Vol 12 (4) ◽  
Author(s):  
B. V. Borysevych ◽  
◽  
V. V. Lisova ◽  
I. M. Derkach ◽  
S. S. Derkach ◽  
...  
Keyword(s):  
Biological Response ◽  
Organ Damage ◽  
The Body ◽  
New Drugs ◽  
Laboratory Animals ◽  
Internal Organs ◽  
Experimental Drug ◽  
Liver And Kidney ◽  
Preclinical And Clinical Studies ◽  
First Time

Iron (IV) clathrochelate based on a macrobicyclic ligand of the hexahydrazide type is a unique compound that contains iron in a rare high valence IV. Preclinical and clinical studies of this complex, which were started for the first time in Ukraine, have an important theoretical and practical consequence as this complex can be recommended as an active substance in iron-containing drugs with antianemic action. In conducting preclinical studies of new drugs, pathomorphological studies are important because they are a necessary step in studying the biological response of animals to the action of test substances. It was found that some pathological changes develop in the body of white mice under conditions of experimental acute and chronic iron (IV) clathrochelate intoxication. They correlated with the dose of the test compound. During chronic intoxication, the microscopic changes in the liver and kidney of white mice treated with iron (IV) clathrochelate at a dose of 1/10 DL50 were similar to the microscopic changes in the liver and kidney of mice treated with the experimental drug at a dose of 1/5 DL50. However, the severity of these changes was lower, reflecting a lower degree of organ damage. In the myocardium of mice treated with iron (IV) clathrochelate at a dose of 1/5 DL50 on the 10th day, as in acute iron (IV) clathrochelate poisoning, only edema was recorded. The prospects for further research are the study of microscopic changes in the organs of laboratory animals of other species during experimental iron (IV) clathrochelate toxicosis.

The locust jump. I. The motor programme

1977 ◽  
Vol 66 (1) ◽  
pp. 203-219
Author(s):  
W. J. Heitler ◽  
M. Burrows
Keyword(s):  
High Frequency ◽  
Tactile Stimulation ◽  
The Body ◽  
Flexor Muscle ◽  
Tactile Stimuli ◽  
Extensor Muscles ◽  
Trigger Activity ◽  
Three Stages ◽  
Motor Programme ◽  
Made In

A motor programme is described for defensive kicking in the locust which is also probably the programme for jumping. The method of analysis has been to make intracellular recordings from the somata of identified motornuerones which control the metathoracic tibiae while defensive kicks are made in response to tactile stimuli. Three stages are recognized in the programme. (1) Initial flexion of the tibiae results from the low spike threshold of tibial flexor motorneurones to tactile stimulation of the body. (2) Co-contraction of flexor and extensor muscles followa in which flexor and extensor excitor motoneurones spike at high frequency for 300-600 ms. the tibia flexed while the extensor muscle develops tension isometrically to the level required for a kick or jump. (3) Trigger activity terminates the co-contraction by inhibiting the flexor excitor motorneurones and simultaneously exciting the flexor inhibitors. This causes relaxation of the flexor muscle and allows the tibiae to extend. If the trigger activity does not occur, the jump or kick is aborted, and the tibiae remain flexed.

scholarly journals GENOTOXIC AND CARCINOGENIC STUDIES OF NORGESTREL IN DROSOPHILA MELANOGASTER

2018 ◽  
Vol 11 (10) ◽  
pp. 372
Author(s):  
Abou-eisha A ◽  
Adel E El-din
Keyword(s):  
Somatic Mutation ◽  
Cellular Proliferation ◽  
Research Work ◽  
The Body ◽  
The Other ◽  
Direct Stimulation ◽  
Carcinogenic Activity ◽  
Genetic Examination ◽  
First Time

Objective: The aim of this study was to investigate, for the first time, the possible in vivo genotoxic and carcinogenic activity associated with exposure to norgestrel (NGT) drug through employing the very recently established and adjusted genotoxic and tumorigenic methods in Drosophila melanogaster.Methods: Two in vivo genotoxic test systems were used; one detects the somatic mutation and recombination effects (somatic mutation and recombination test [SMART] wing-spot test) and the other detects the primary DNA damage (the comet test) in the body cells of D. melanogaster. On the other hand, the warts (wts)-based SMART assay is a vital genetic examination in Drosophila used to identify and characterize cancer potential of compounds.Results: Four experimental doses of NGT were used (ranging from 0.24 μM to 16 μM). NGT was found to be non-genotoxic at all tested concentrations even at the highest dose level 16 μM and failed to increase the frequency of tumors in the somatic cells of D. melanogaster.Conclusion: Our results strengthen the hypothesis that steroidal drugs might act through a non-genotoxic carcinogen mechanism where the carcinogenic properties occur by direct stimulation of cellular proliferation through a steroid receptor-mediated mechanism. In addition, the results obtained in this research work may contribute to highlighting the importance of NGT as a potent neuroprotective antioxidant drug.

From Hard-Copy to Digital Law via “Illustrated Courtrooms”: Visualising the History of Legal English

Pólemos ◽  
2017 ◽  
Vol 11 (1) ◽  
Author(s):  
Matteo Nicolini
Keyword(s):  
English Language ◽  
Body Politic ◽  
The Body ◽  
Hard Copy ◽  
Legal Language ◽  
History Of ◽  
Judicial Proceedings ◽  
Three Stages ◽  
The Law ◽  
Digital Law

Abstract This essay addresses different patterns of the visualisation of the law. It examines how scholars attempt to depict, represent, and perform the law and its founding authority. It also focuses on the pragmatics of legal language: written and spoken standard legal English are pragmatically enriched within contexts where the law is interpreted, uttered, or performed. The linguistic notion of “context” discloses the interrelations between the agendas of law and power and reveals how the law conveys its content to the body politic as its ultimate addressee. It then proposes a renewed concept of legal linguistics. In order to determine the different ideologies underpinning the evolution of English legal language, as well as its prototypical forms of the visualisation of the law, three stages in the history of the English language will be examined: Late Middle English, Early Modern English, and Contemporary English. Each of these stages will be likened to the different parts of judicial proceedings. This will allow us to examine how English legal language has been used in a specific context, the trial, where the law is both uttered and performed.

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