scholarly journals The Development and Structure of the Anterior Region of the Body in the Sabellariidae, with special reference to Phragmatopoma californica

1952 ◽  
Vol s3-93 (24) ◽  
pp. 435-452
Author(s):  
R. PHILLIPS DALES
Keyword(s):  
Special Reference ◽  
Larval Development ◽  
The Body ◽  
Anterior Region ◽  
Single Pair ◽  
Phragmatopoma Californica

Attention is drawn to the confusion which has been caused by the loose terminology of the anterior appendages in polychaetes, and more exact connotations are proposed. As the prostomium can be recognized as a comparable unit throughout the Polychaeta, a consideration of its constitution is deferred. In the present paper the development and constitution of the anterior region of the sabellariid worms are considered. The larval development of Phragmatopoma californica (representing the most highly advanced genus) is described, and the structure of the adult of this species is compared with that of species belonging to other genera. It is concluded that the opercular stalk arises mainly from the first segment; that the opercular paleae represent the notochaetae of the first two segments, and that the oral tentacles and the building organ are also developed from the first segment. The prostomium bears a single pair of tentacles.

Memoirs: On the Tracheal System of Collembola, with special reference to that of Sminthurus viridis, Lubb

1927 ◽  
Vol s2-71 (281) ◽  
pp. 15-30
Author(s):  
W. MALDWYN DAVIES
Keyword(s):  
Special Reference ◽  
Extensive Study ◽  
The Body ◽  
Anterior Region ◽  
Single Pair ◽  
Tracheal System ◽  
General Plan ◽  
Constant Feature ◽  
Two Sides ◽  
Unique Condition

1. No extensive study of the tracheal system of Collembola has previously been made. 2. The general plan of the tracheae has been worked out on Sminthurus viridis; two independent systems exist. 3. The presence of only a single pair of spiracles constitutes a unique condition among adult insects. The position of these is in the anterior region of the prothorax, and not in the head or cervicum as previously believed. The structure of the spiracles is extremely primitive and they possess no closing apparatus. 4. The tracheae branch dichotomously, but no anastomosis exists between the systems of the two sides of the body. Taenidia are present, but no ‘transition cells’ have been observed and the fine tracheae terminate in unbranched tracheoles. 5. The initial entrance of air into the tracheae is through the spiracles; the displacement of fluid is very slow and the whole system is not completely filled with air until about fourteen days after emergence from the egg. 6. Tracheae are found to be a constant feature in all members of the Sminthurinae examined. 7. Various methods of technique adopted are given.

A STUDY ON SROTODUSHTI WITH SPECIAL REFERENCE TO ASSESSMENT OF SROTOSHTI LAKSHANA IN ARTAVAVAHA SROTAS THROUGH CLINICAL, BIOCHEMICAL AND RADIOLOGICAL FINDINGS’- SURVEY STUDY

2021 ◽  
Vol 9 (10) ◽  
pp. 2339-2346
Author(s):  
Shivakumari Shivakumari ◽  
Vasudev A Chate ◽  
Shreevastha Shreevastha
Keyword(s):  
Special Reference ◽  
Transport System ◽  
Normal State ◽  
The Body ◽  
Radiological Examination ◽  
Survey Study ◽  
Radiological Findings ◽  
Anatomical Structures ◽  
Conceptual Study

The concept of Srotas and Srotodushti Lakshana has been very scientifically explained in the various context of Ayurveda literature. Detailed Srotas and Srotodushti Lakshana are according to Charaka Samhita Vimansthana assessment of Srotodushti Lakshana can be done by Pratyksha Pramana and in detail explanation. The Srotas play an important role in physiology and the pathogenesis of diseases in normal state; they regulate the physiolo- gy of the body and maintain the anatomical structures of dhatus. The influences of aetiology factors on Srotas can affect pathological manifestations. Considering this fact present study explores various aspects related to the Sro- tas, Srotodushti and Srotodushti Lakshana. Objectives-To assessment of Srotodushti Lakshana in Artavavaha Srotas through Clinical, biochemical, and radiological examination in Artavavaha Srotas. Methodology -The study was conducted under two headings, conceptual and survey study. Conceptual study all the concerned litera- ture were referred and analysed and for survey study, the Artvavaha Sroto Vikara observed and survey through face-face interview. -Hence it is concluded that the knowledge of Srotas is not only used in learning about the anatomy of the transport system of the body but also to understand their physiology and pathology. It can be as- sessed through clinical, biochemical, and radiological findings. Keywords: Srotas, Srotodushti Lakshana, Artavavaha Srotas,

Boyhood, Sport, and the Mild Brutalization of the Body

2021 ◽  
Vol 14 (1) ◽  
pp. 104-115
Author(s):  
Jeff Hearn
Keyword(s):  
Special Reference ◽  
Young Men ◽  
The Body ◽  
The World

In this contribution, I consider some appreciative links and qualified connections between Raewyn Connell’s work and my own. In particular, I use the example of sport, a key area in the making of boys and young men in many parts of the world, with special reference to body, practice, and theoretical and empirical conceptualizations of masculinity.

Memoirs: The Development of the Serpiilid Pomatoeeros Triqueter L

1941 ◽  
Vol s2-82 (327) ◽  
pp. 467-540 ◽  
Author(s):  
F. SEGROVE
Keyword(s):  
Body Wall ◽  
Feeding Activity ◽  
Dorsal Surface ◽  
The Body ◽  
Single Pair ◽  
Feeding Apparatus ◽  
Food Material ◽  
Locomotor Apparatus ◽  
Adult Feeding ◽  
Branchial Crown

1. The larvae of Pomatoceros triqueter L. were obtained by artificial fertilization and reared through metamorphosis and for several months afterwards. Larval development took three weeks in summer, and about the same time in winter when the temperature was maintained at 65° F. 2. The eggs are small and give rise to typical trochosphere larvae with well-developed prototroch, metatroch, neurotroch, and feeding cilia, a spacious blastocoelic body-cavity and paired protonephridia. A head-vesicle and a conspicuous anal vesicle are also present. The right eye develops before the left. The larva is very active and grows rapidly at the expense of collected food material. 3. Three setigerous segments arise simultaneously; a fourth is added prior to metamorphosis. The lateral collar-folds develop in two capacious pockets which arise by invagination of the body-wall behind the metatroch, the ventral collar-fold by outgrowth of the ventral body-wall. The rudiments of the thoracic membrane appear above the lateral collar-folds. 4. Metamorphosis commences with the shrinkage of the locomotor apparatus, which leads to the exposure of the lateral collar-folds. The larva settles to the bottom and creeps about on its ventral surface by means of the neurotroch. The branchial crown arises as tripartite outgrowths on the sides of the head. The remaining tissues of the head, apart from the cerebral ganglion and eyes, are gradually resorbed. No tissue is thrown off. 5. The neurotroch gradually disappears and is replaced by cilia on the dorsal surface. The worm begins to secrete a calcareous tube. The resorption of the head is completed and the mouth assumes a terminal position surrounded by the branchial crown. 6. A fourth pair of filaments is added to the branchial crown. The dorsal pair of filaments develops into 'palps'. The third filament on the left side is modified as the operculum; the remaining filaments develop pinnules. 7. Further segments are added to the trunk. Those first added are of the thoracic type from the beginning. The eighth and succeeding setigers are of the abdominal type. The thoracic membrane gradually extends backwards to the posterior end of the thorax. 8. The thoracic nephridia arise as a single pair of cells which give rise to the dorsal unpaired duct by outgrowth. 9. The influence of the egg on the course of development is discussed. It is suggested: (a) that the small size of the egg is responsible for the active habits and protracted pelagic life of the larva; (b) that the mode of development of the collar is significant in that interference with the locomotor and feeding apparatus is thereby avoided; (c) that the general shrinkage which occurs at metamorphosis is related to a suspension of feeding activity in the period between the degeneration of the larval and the establishment of the adult feeding apparatus. 10. The development of Pomatoceros is compared with that of the Serpulid Psygmobranchus and the Sabeilid Branchiomma.

Gill and Body Surface Areas of the Carp in relation to Body Mass, With Special Reference To The Metabolism-Size Relationship

1985 ◽  
Vol 117 (1) ◽  
pp. 1-14 ◽  
Author(s):  
SHIN OIKAWA ◽  
YASUO ITAZAWA
Keyword(s):  
Special Reference ◽  
Body Mass ◽  
Body Surface ◽  
Larval Stage ◽  
The Body ◽  
Positive Allometry ◽  
Surface Areas ◽  
Gill Area ◽  
Resting Metabolism ◽  
The Relationship

The relationships of resting metabolism per unit mass of body to gill and body surface areas were examined by measuring gill, body surface and fin areas of carp ranging from 0.0016 to 2250g. There was a triphasic allometry for the relationship between gill area and body mass: during the prelarval (0.0016–0.003 g) and postlarval (0.003–0.2g) stages there was a positive allometry (slopes of 7.066 and 1.222, respectively), during the juvenile and later stages (0.2–2250 g) there was a negative allometry with a slope of 0.794. There was a diphasic negative allometry for the relationship between surface area of the body or the fins and body mass, with a slope of 0.596 or 0.523 during the larval stage and 0.664 or 0.724 during the juvenile and later stages, respectively. Except for the 3rd phase (juvenile to adult) of gill area, these slopes were significantly different (P<0.01) from the slope for the relationship between resting metabolism and body mass of intact carp (0.84; value from Winberg, 1956). It is considered, therefore, that gill, body surface and fin areas do not directly regulate the resting metabolism of the fish, in the larval stage at least.

XIV.—The Absorption of Light by Inorganic Salts. No. XI.: Conclusion

1914 ◽  
Vol 33 ◽  
pp. 156-165
Author(s):  
R. A. Houstoun
Keyword(s):  
Special Reference ◽  
Present State ◽  
Light Wave ◽  
Wave Length ◽  
The Body ◽  
Inorganic Salts ◽  
Short Account ◽  
Absorption Of Light ◽  
Dispersion Of Light

In this paper a short account will be given of the present state of the theory of the absorption of light, with special reference to the results gained in this series of investigations.Theories of the dispersion of light may be divided into two classes: (1) those in which the body is regarded as consisting of particles which vibrate under the influence of the light wave; and (2) those in which the body is regarded as consisting of obstacles which diffract the light wave. According to (2), light is scattered, not absorbed; a wave going through the body diminishes in intensity, but the energy lost is radiated out laterally without change of wave-length.

Recollection and Prophesy in the De Divinatione

Phronesis ◽  
2000 ◽  
Vol 45 (1) ◽  
pp. 64-76 ◽  
Author(s):  
Keyword(s):  
Special Reference ◽  
The Body ◽  
Good Sense

AbstractIn the light of Glucker's claim to have found in De Divinatione 1.115 a separate, unnamed Pythagorean-Platonic influence on Cicero, I examine the passage again with special reference to early Platonic interpretation. I find that the Meno's influence is wider than had been suspected, suggesting (i) the correspondence between the two types of 'natural' divination, dreams and ecstatic prophecy, and (ii) the kinship of souls. Posidonius' influence on the underlying interpretation of Platonic psychology is to be detected, insofar as he would have read Meno 81d as a statement about all souls (together) having all available knowledge. However, Cratippus, Cicero's other main source, can be held to have directly borrowed from Meno 81d2-3 for his crowning argument (De Div. 1.71), and it is likely that other material that uses 81d would also stem from Cratippus. A little is known elsewhere of early interpretation of the Meno. Comparison with other early 'Platonist' material suggests strongly that we must look to Antiochus' school for this view that dreams regularly contain substantial truth explicable in terms of the nature of soul. This would lead once again to Cratippus, and nothing prevents our detecting his hand behind 1.115. Indeed 1.70, which Glucker uses to argue that Cratippus' dream-divining soul would literally have to leave the body, only makes good sense when understood metaphorically.

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