Memoirs: The Development of Ophiothrix fragilis

1907 ◽  
Vol s2-51 (204) ◽  
pp. 557-606
Author(s):  
E. W. MACBRIDE
Keyword(s):  
Vascular System ◽  
Ganglion Cells ◽  
Outer Part ◽  
Ventral Horn ◽  
Ring Shape ◽  
Left Posterior ◽  
Posterior Division ◽  
Anterior Division ◽  
The Moment ◽  
The Right

The principal points which have been brought out in this paper may be summarised as follows : (1) The early development of Ophiothrix fragilis varies with the condition of the egg at the moment of fertilisation, and the development of the unripe egg resembles in certain features that of Ophiura brevis. (2) The cœlom originates as a single vesicle from the apex of the archenteron, and this appears to be true for all classes of Echinoderms. (3) The segmentation of the cœlom proceeds along the same lines as those already elucidated for Asteroidea and Echinoidea, viz. into three somites on each side, but the middle somite on the right side is not shifted dorsally as it is in Asteroidea and Echinoidea. This somite occasionally assumes a five-lobed form, proving beyond doubt that it is a right antimere of the water-vascular system. (4) The left hydrocœle is budded from the anterior division of the left cœlom, not from the posterior division as Bury supposed (5), and its persistent connection with the left anterior cœlom constitutes the stone-caual; this opens into the hydrocœle between lobes 1 and 2, as in Asteroidea, not between lobes 4 and 5 as Bury asserted. (5) The metamorphosis is initiated by a preponderant growth of the organs of the left side, which affects the larval arms and the sides of the œsophagus, aud which not only carries the hydrocœle round the œsophagus but also the madreporic pore and the left anterior cœlom, so that these come to be near the right hydrocœle. (6) The perihæmal system of canals originates as a series of five hollow evaginations, the cavities being small and the walls thick. The first Originates from the left anterior cœlom, the other four from the left posterior cœlom. From their walls originate the motor ganglion cells and in all probability the ventral inter-vertebral muscles. (7) The left posterior cœlom gives rise to a dorsal and a ventral horn, which eventually meet, causing it to assume a ring-shape. From it five evaginations give rise to the arm rudiments and the first of these comes to overlie hydrocœle lobe No. 2. (8) A peri-oral cœlom closely surrounding the adult œsophagus originates from the left posterior cœlom. (9) A series of epineural ridges, the tops of which grow out so as to form arch-like folds, are formed inter-radially alternating with the primary tentacles. By the union of adjacent arches the basal portions of the tentacles are covered, exactly as occurs in. the Echinoid larva. (10) The adult œsophagus is formed from the left inner portion of the larval one: its covering is made of the adoral ciliated baud, chiefly of the left half thereof, which grows pari passu with the left hydrocœle. The outer part of the larval œsophagus opens out in consequence of the shrinkage of the forehead to form an atrium into which the primary hydrocœle lobes project. (11) The larval intestine slowly diminishes in size and degenerates, this process being accompanied by a vacuolisation of its cells. The larval stomach becomes pushed over to the right--a process which leads to the same result as the moving of the larval mouth to the left in Holothuroidea, or the formation of the adult mouth on the left in Asteroidea and Echinoidea. (12) The primitive germ-cells originate from the left posterior cœlom covering the stone-canal. In conclusion, I have to express my thanks, first to the University of Cambridge and to the British Association, who granted me the use of their tables at Plymouth; next to Dr. E. J. Allen, Director of the Marine Biological Laboratory at Plymouth, who in the most whole-hearted and generous manner placed the resources of the laboratory at my disposal; then to my friend and colleague, Mr. J. Simpson, B.Sc., Demonstrator of Zoology in McGill University, to whoso skill I owe a large proportion of the drawings which illustrate this paper; and lastly to my wife, who also assisted with the more complicated drawings, with the text-figures, and with the general revision of the text.

scholarly journals V. The physiology of sugar in relation to the blood

1878 ◽  
Vol 26 (179-184) ◽  
pp. 314-321
Keyword(s):  
Carotid Artery ◽  
Natural Condition ◽  
Royal Society ◽  
Vascular System ◽  
Arterial System ◽  
Post Mortem ◽  
Arterial Blood ◽  
True Condition ◽  
The Moment ◽  
The Right

In a communication published in the ‘Transactions of the Royal Society ’(1860, p. 579) I gave the results of analyses showing that what had previously been looked upon, under Bernard’s glycogenic theory, as the natural condition of the blood in relation to sugar was a fallacious representation due to a post mortem change being allowed to exert its influence. It had hitherto been asserted that the blood of the right side the heart was in a notably different condition as regards the amount of sugar it contained from that of the arterial system, an error which I discovered arose from the non-observance of certain precautions in the mode of obtaining the blood for examination from the respective parts of the vascular system. Whilst the arterial blood had been collected during life, it was customary to collect that from the right side of the heart, without any special haste, after the destruction of the life of the animal. During the period thus allowed to elapse between the moment of death and the collection of the blood, an alteration occurs from the post mortem production of sugar in the liver, which causes the blood to assume an extent of saccharine impregnation which does not naturally belong to it during life, and which had faded to be recognized in its true light. I gave analyses which show that what was formerly taken as representing he natural condition of the blood of the right side of the heart furnished from .50 to .94 per cent., or, as it is more convenient to state it, 5.0 to 9.4 per 1000 of sugar, the blood from the carotid artery of the same animals, collected during life, having contained what I described as a trace of sugar. Other analyses, three in number, were given, representing the true condition of the blood belonging to the right side of the heart during life, and the results indicated from .47 to .73 per 1000 as the amount of sugar. Bernard has recently published some communications entitled “Critiques expérimentales sur la glycémaie,” in the Comptes Rendus de I’Académie des Sciences de Paris. His statements are founded upon a method of analysis which is not only strikingly devoid of precision as a quantitative analytical process, but in itself of a nature calculated to give rise to a fallacious result.

scholarly journals VARIATIONS IN THE BRANCHING PATTERN OF THE INTERNAL ILIAC ARTERY IN AN ADULT MALE – A CASE REPORT. Variaciones en el patrón de ramificación de la arteria ilíaca interna en un varón adulto: informe de un caso

2016 ◽  
Vol 4 (1) ◽  
pp. 25-28
Author(s):  
Satheesha Nayak B ◽  
Srinivasa Rao Sirasanagandla ◽  
Narendra Pamidi ◽  
Raghu Jetti
Keyword(s):  
Iliac Artery ◽  
Internal Iliac Artery ◽  
Clinical Importance ◽  
Branching Pattern ◽  
Obturator Artery ◽  
Cadaveric Specimen ◽  
Internal Iliac ◽  
Posterior Division ◽  
Anterior Division ◽  
The Right

Variaciones en el patrón de ramificación de la arteria ilíaca interna son ocasionalmente encontradas en las disecciones cadavéricas y las cirugías. Algunas de las variaciones son de importancia quirúrgica y clínica e ignorarlas podría derivar en alarmantes sangrados durante las prácticas quirúrgicas. Evaluamos las variantes en el patrón de la arteria ilíaca interna en un cadáver masculino. La división de la arteria ilíaca interna dio origen a las arterias rectal media y obturatriz. La arteria vesical superior tenía su origen en la arteria obturatriz. La división posterior de la arteria ilíaca interna dio lugar a las arterias iliolumbar, sacra lateral, glútea superior y pudenda interna. La arteria glútea inferior estaba ausente. Variations in the branching pattern of the internal iliac artery are occasionally encountered during cadaveric dissections and surgeries. Some of the variations are of surgical and clinical importance and ignoring them might result in alarming bleeding during surgical procedures. We report variant branching pattern of the right internal iliac artery in a male cadaveric specimen. The anterior division of the internal iliac artery gave origin to obturator and middle rectal arteries. Superior vesical artery took its origin from the obturator artery. The posterior division of the internal iliac artery gave iliolumbar, lateral sacral, superior gluteal and internal pudendal arteries. The inferior gluteal artery was absent.

Would you Make the Right Decision? – Decision Making Biases in Economy - Related Dilemmas

2018 ◽  
Vol 9 (1) ◽  
pp. 59-66
Author(s):  
Zsuzsanna Gödör ◽  
Georgina Szabó
Keyword(s):  
Decision Making ◽  
Online Survey ◽  
Framing Effect ◽  
Economic Knowledge ◽  
Bank Account ◽  
Financial Decisions ◽  
Hungarian Population ◽  
The Moment ◽  
The Right ◽  
Decision Making Biases

Abstract As they say, money can’t buy happiness. However, the lack of it can make people’s lives much harder. From the moment we open our first bank account, we have to make lots of financial decisions in our life. Should I save some money or should I spend it? Is it a good idea to ask for a loan? How to invest my money? When we make such decisions, unfortunately we sometimes make mistakes, too. In this study, we selected seven common decision making biases - anchoring and adjustment, overconfidence, high optimism, the law of small numbers, framing effect, disposition effect and gambler’s fallacy – and tested them on the Hungarian population via an online survey. In the focus of our study was the question whether the presence of economic knowledge helps people make better decisions? The decision making biases found in literature mostly appeared in the sample as well. It proves that people do apply them when making decisions and in certain cases this could result in serious and costly errors. That’s why it would be absolutely important for people to learn about them, thus increasing their awareness and attention when making decisions. Furthermore, in our research we did find some connection between decisions and the knowledge of economics, people with some knowledge of economics opted for the better solution in bigger proportion

JUSTICE AND SOCIAL CHANGE FOR INCLUSIVE EDUCATION IN INDONESIA AND ASEAN FOR DISABLED PERSONS (STUDY ON PEOPLE AFFECTED BY LEPROSY)

2017 ◽  
Vol 1 (1) ◽  
pp. 1-5
Author(s):  
Nuah Perdamenta Tarigan ◽  
Christian Siregar ◽  
Simon Mangatur Tampubolon
Keyword(s):  
Inclusive Education ◽  
Local Governments ◽  
Disabled Persons ◽  
Equal Rights ◽  
Central Java ◽  
The People ◽  
Asean Countries ◽  
The Government ◽  
The Moment ◽  
The Right

Justice that has not existed and is apparent among the disabilities in Indonesia is very large and spread in the archipelago is very large, making the issue of equality is a very important thing especially with the publication of the Disability Act No. 8 of 2016 at the beginning of that year. Only a few provinces that understand properly and well on open and potential issues and issues will affect other areas including the increasingly growing number of elderly people in Indonesia due to the increasing welfare of the people. The government of DKI Jakarta, including the most concerned with disability, from the beginning has set a bold step to defend things related to disability, including local governments in Solo, Bali, Makassar and several other areas. Leprosy belonging to the disability community has a very tough marginalization, the disability that arises from leprosy quite a lot, reaches ten percent more and covers the poor areas of Indonesia, such as Nusa Tenggara Timur, Papua, South Sulawesi Provinces and even East Java and West Java and Central Java Provinces. If we compare again with the ASEAN countries we also do not miss the moment in ratifying the CRPD (Convention of Rights for People with Disability) into the Law of Disability No. 8 of 2016 which, although already published but still get rejections in some sections because do not provide proper empowerment and rights equality. The struggle is long and must be continued to build equal rights in all areas, not only health and welfare but also in the right of the right to receive continuous inclusive education.

Objective Measurement of Sustained Pupillary Constriction: A Pilot Study Using an App-Based Pupilometer

2020 ◽  
pp. 57-63
Keyword(s):  
Ganglion Cells ◽  
Modern Technology ◽  
Objective Measurement ◽  
Retinal Ganglion ◽  
Case Examples ◽  
Pupillary Reaction ◽  
Sympathetic Nervous Systems ◽  
Pupillary Constriction ◽  
The Individual ◽  
The Right

Background: The pupillary reaction is controlled by the two main branches of the autonomic nervous system, namely the parasympathetic and sympathetic nervous systems. New discoveries in pupil research has identified that intrinsically photosensitive retinal ganglion cells have an impact on pupillary constriction, particularly sustained pupillary constriction. In the current paper, an objective measurement of sustained pupillary constriction versus the inability to maintain sustained pupillary constriction are observed. The variability in the sustained pupillary constriction, i.e. Alpha Omega pupil, can be objectively identified with the use of modern technology. Case Examples: Two female subjects were adapted to dim illumination, and then two objective pupil measurements of the right eye using Reflex – PLR Analyzer by BrightLamp© (Indianapolis, IN, USA) with sustained illumination were obtained. Subject 1, a 25 year-old-female, demonstrated normal ability of the pupil to constrict and sustain constriction for 10 seconds. She was used as a control for subject 2. Subject 2, a 27 year-old-female, demonstrated the inability to sustain pupillary constriction. She reported being under great psychological stress. Her pupil began to re-dilate between 2 and 3 seconds after the initial constriction. Conclusion: Objective pupillometry can be used to assist in many diagnoses and provides the clinician invaluable information on the state of the individual, and qualifications of sustained pupillary constriction can now be assessed in an objective manner.

scholarly journals Comparison of the accuracy of intraoral scans between complete-arch scan and quadrant scan

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Youn-Gyeong Moon ◽  
Kyung-Min Lee
Keyword(s):  
Third Molar ◽  
Careful Consideration ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Posterior Quadrant ◽  
Left Posterior ◽  
The Right ◽  
Best Fit ◽  
Posterior Area

Abstract Objective To compare the accuracy of complete-arch scans and quadrant scans obtained using a direct chairside intraoral scanner. Material and methods Intraoral scans were obtained from 20 adults without missing teeth except for the third molar. Maxillary and mandibular complete-arch scans were carried out, and 4 quadrant scans for each arch were performed to obtain right posterior, right anterior, left anterior, and left posterior quadrant scans. Complete-arch scans and quadrant scans were compared with corresponding model scans using best-fit surface-based registration. Shell/shell deviations were computed for complete-arch scans and quadrant scans and compared between the complete-arch scans and each quadrant scans. In addition, shell/shell deviations were calculated also for each individual tooth in complete-arch scans to evaluate factors which influence the accuracy of intraoral scans. Results Complete-arch scans showed relatively greater errors (0.09 ~ 0.10 mm) when compared to quadrant scans (0.05 ~ 0.06 mm). The errors were greater in the maxillary scans than in the mandibular scans. The evaluation of errors for each tooth showed that the errors were greater in posterior teeth than in anterior teeth. Comparing the right and left errors, the right side posterior teeth showed a more substantial variance than the left side in the mandibular scans. Conclusion The scanning accuracy has a difference between complete-arch scanning and quadrant scanning, particularly in the posterior teeth. Careful consideration is needed to avoid scanning inaccuracy for maxillary or mandibular complete-arch, particularly in the posterior area because a complete-arch scan might have potential error than a quadrant scan.

scholarly journals Bicuspid aortic valve morphology and aortic valvular outflow jets: an experimental analysis using an MRI-compatible pulsatile flow circulation system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaoru Hattori ◽  
Natsuki Nakama ◽  
Jumpei Takada ◽  
Gohki Nishimura ◽  
Ryo Moriwaki ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Pulsatile Flow ◽  
Aortic Wall ◽  
Ascending Aorta ◽  
Circulation System ◽  
Resonance Imaging ◽  
Left Posterior ◽  
Flow Circulation ◽  
The Right

AbstractThe characteristics of aortic valvular outflow jet affect aortopathy in the bicuspid aortic valve (BAV). This study aimed to elucidate the effects of BAV morphology on the aortic valvular outflow jets. Morphotype-specific valve-devising apparatuses were developed to create aortic valve models. A magnetic resonance imaging-compatible pulsatile flow circulation system was developed to quantify the outflow jet. The eccentricity and circulation values of the peak systolic jet were compared among tricuspid aortic valve (TAV), three asymmetric BAVs, and two symmetric BAVs. The results showed mean aortic flow and leakage did not differ among the five BAVs (six samples, each). Asymmetric BAVs demonstrated the eccentric outflow jets directed to the aortic wall facing the smaller leaflets. In the asymmetric BAV with the smaller leaflet facing the right-anterior, left-posterior, and left-anterior quadrants of the aorta, the outflow jets exclusively impinged on the outer curvature of the ascending aorta, proximal arch, and the supra-valvular aortic wall, respectively. Symmetric BAVs demonstrated mildly eccentric outflow jets that did not impinge on the aortic wall. The circulation values at peak systole increased in asymmetric BAVs. The bicuspid symmetry and the position of smaller leaflet were determinant factors of the characteristics of aortic valvular outflow jet.

Specification of retinotectal connexions during development of the toad Xenopus laevis

Development ◽  
1980 ◽  
Vol 55 (1) ◽  
pp. 77-92
Author(s):  
S. C. Sharma ◽  
J. G. Hollyfield
Keyword(s):  
Xenopus Laevis ◽  
Ganglion Cell ◽  
Retinal Ganglion Cells ◽  
Optic Tectum ◽  
Ganglion Cells ◽  
The Other ◽  
Retinal Ganglion ◽  
Visual Projection ◽  
Series Of Experiments ◽  
The Right

The specification of central connexions of retinal ganglion cells was studied in Xenopus laevis. In one series of experiments, the right eye primordium was rotated 180° at embryonic stages 24–32. In the other series, the left eye was transplanted into the right orbit, and vice versa, with either 0° or 180° rotation. After metamorphosis the visual projections from the operated eye to the contralateral optic tectum were mapped electrophysiologically and compared with the normal retinotectal map. In all cases the visual projection map was rotated through the same angle as was indicated by the position of the choroidal fissure. The left eye exchanged into the right orbit retained its original axes and projected to the contralateral tectum. These results suggest that retinal ganglion cell connexions are specified before stage 24.

Glosa do Wyroku Trybunału Konstytucyjnego z dnia 16 maja 2018 r., sygn. akt SK 18/17

2021 ◽  
Vol 4(165) ◽  
pp. 147-158
Author(s):  
Agnieszka Kawałko
Keyword(s):  
Family Relationship ◽  
Time Limit ◽  
Biological Origin ◽  
The Right To Know ◽  
Civil Status ◽  
Constitutional Tribunal ◽  
The Republic ◽  
The Moment ◽  
The Right ◽  
Age Of Majority

The commented ruling of the Constitutional Tribunal concerns the constitutionality of the provision of Article 70(1) of the Family and Guardianship Code, which provided that the time limit for a child to bring an action to deny the paternity of his or her mother’s husband is three years and runs from the moment the child reaches the age of majority, regardless of the child’s know-ledge of his or her biological origin, i.e. regardless of whether the child within that time limit acquired knowledge that he or she did not come from his or her mother’s husband and whether the child could decide to bring an action. The expiry of the three-year period resulted in the expiry of the child’s right to claim the denial of paternity of the mother’s husband and, consequently, precluded the possibility of a positive determination of the paternity of a man other than the mother’s husband. The Constitutional Tribunal found this provision to be inconsistent with Article 30 in conjunction with Article 47 in conjunction with Article 31(3) of the Constitution of the Republic of Poland. The author agrees with the position expressed by the Constitutional Tribunal in the judgment in question, which in this case provides a basis for consideration of the relationship between the right to know one’s biological origin and the value of stabilising the civil status of a child and persons remaining in an established family relationship with him or her.

Effect of canine cardiac nerves on heart rate, rhythm, and pacemaker location

1986 ◽  
Vol 250 (4) ◽  
pp. H630-H644 ◽  
Author(s):  
R. B. Schuessler ◽  
J. P. Boineau ◽  
A. C. Wylds ◽  
D. A. Hill ◽  
C. B. Miller ◽  
...  
Keyword(s):  
Heart Rate ◽  
Right Atrium ◽  
General Trend ◽  
Canine Model ◽  
Right Atrial ◽  
Sympathetic Stimulation ◽  
Open Chest ◽  
Left Posterior ◽  
The Right ◽  
Cardiac Nerves

In open-chest dogs, right- and left-sided cardiac nerves were stimulated to determine their effect on heart rate, rhythm, and pacemaker location. The majority of the nerves produced chronotropic changes; 72% of the induced rhythms originated from within the atrial pacemaker complex. Ten percent of the stimulations produced an atrio-ventricular (AV) nodal rhythm; most of the time this was induced by the left posterior and anterior ansae and ventrolateral nerves. The dominance of a lateral right atrial pacemaker was observed in 8% of the stimulations; the dorsal cardiac and innominate nerves induced this rhythm the majority of the time. The general trend was for a cranial shift in the location of the pacemaker within the pacemaker complex with sympathetic stimulation and a caudal shift with parasympathetic stimulation. Exceptions to the pattern may be explained by the preferential effect of the nerves on the pacemakers in the right atrium. The study demonstrates, in the canine model, that in addition to the sinus and AV nodes, there is a system of pacemakers controlled by the cardiac nerves.

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