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.

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.

Rhythmicity in the early swimming of anuran larvae

Development ◽  
1964 ◽  
Vol 12 (4) ◽  
pp. 665-671
Author(s):  
Michael Corner
Keyword(s):  
Tactile Stimulation ◽  
Extensive Study ◽  
The Body ◽  
Quantitative Characterization ◽  
Anatomical Basis ◽  
The Central Nervous System ◽  
Two Sides ◽  
The Waves ◽  
Made In

Previous observations of the development of somatic movements in amphibians concentrated their attention on ‘reflex’ mechanisms (for review, see Hooker, 1952). Extensive study has been made of the types of movement evoked by tactile stimulation at different stages in early development and on the anatomical basis for such responses. Emphasis was thus placed upon the formation of direct pathways through the central nervous system from receptor to effector. For the swimming movements, this approach was able to account for (a) the cranio-caudal wave of somite contractions, in response to sensory input from any part of the body surface, and (b) the existence of a phase difference between the waves on the two sides of the body. A quantitative characterization of behavior at successive stages has also been made, in terms of the distances travelled per response (cf. Detwiler, 1948; Sladeček, 1960).

Pressure cycles and the water economy of insects

1988 ◽  
Vol 318 (1190) ◽  
pp. 377-407 ◽  
Keyword(s):  
Body Temperature ◽  
Water Exchange ◽  
Vapour Phase ◽  
The Body ◽  
Tracheal System ◽  
Water Economy ◽  
Insect Wings ◽  
Pressure Cycle ◽  
Respiratory Gases

Water exchange between insects and their environment via the vapour phase includes influx and efflux components. The pressure cycle theory postulates that insects (and some other arthropods) can regulate the relative rates of influx and efflux of water vapour by modulating hydrostatic pressures at a vapour-liquid interface by compressing or expanding a sealed, gas-filled cavity. Some such cavities, like the tracheal system, could be compressed by elevated pressure in all or part of the haemocoele. Others, perhaps including the muscular rectum of flea prepupae, could be compressed by intrinsic muscles. Maddrell Insect Physiol . 8, 199 (1971)) suggested a pressure cycle mechanism of this kind to account for rectal uptake of water vapour in Thermobia but did not find it compatible with quantitative information then available. Newer evidence conforms better with the proposed mechanism. Cyclical pressure changes are of widespread occurrence in insects and have sometimes been shown to depend on water status. Evidence is reviewed for the role of the tracheal system as an avenue for net exchange of water between the insect and its environment. Because water and respiratory gases share common pathways, most published findings fail to distinguish between the conventional view that the tracheal system has evolved as a site for distribution and exchange of respiratory gases and that any water exchange occurring in it is generally incidental and nonadaptive, and the theory proposed here. The pressure cycle theory offers a supplementary explanation not incompatible with evidence so far available. The relative importance of water economy and respiratory exchange in the functioning of compressible cavities such as the tracheal system remains to be explored. Some further implications of the pressure cycle theory are discussed. Consideration is given to the possible involvement of vapour-phase transport in the internal redistribution of water within the body. It is suggested that some insect wings may constitute internal vapour-liquid exchange sites, where water can move from the body fluids to the intratracheal gas. Ambient and body temperature must influence rates of vapour-liquid mass transfer. If elevated body temperature promotes evaporative discharge of the metabolic water burden that has been shown to accumulate during flight in some large insects, their minimum threshold thoracic temperature for sustained flight may relate to the maintenance of water balance. The role of water economy in the early evolution of insect wings is considered. Pressure cycles might help to maintain water balance in surface-breathing insects living in fresh and saline waters, but the turbulence of the surface of the open sea might prevent truly marine forms from using this mechanism.

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,

XX. Researches on the foraminifera.—Part III. On the genera peneroplis, operculina , and amphistegina

1859 ◽  
Vol 9 ◽  
pp. 334-337
Keyword(s):  
Detailed Comparison ◽  
The Body ◽  
The Other ◽  
Considerable Degree ◽  
Composite Body ◽  
Calcareous Deposit ◽  
General Plan ◽  
Partition Walls ◽  
Adjacent Segments

In his preceding memoirs, the author has shown that two very dissimilar types of structure present themselves among Foraminifera, one characterized by its simplicity, the other by its complexity. In the former, of which Orbitolites, Orbiculina and Alveolina are typical examples, the calcareous skeleton does not present any definite indications of organization, but seems to have been formed by the simple calcification of a portion of the homogeneous sarcode-body of the animal; that sarcode-body is but very imperfectly divided into segments, the communications between the cavities occupied by these segments being very free and irregular; the form of the segments themselves, and the mode of their connexion, are alike inconstant; and even the plan of growth, on which the character of the organism as a whole depends, though preserving a general uniformity, is by no means invariably maintained. In the latter, to which Cycloclypeus and Heterostegina belong, the calcareous skeleton is found to present a very definite and elaborate organization. The several segments of the body are so completely separated from each other, that they remain connected only by delicate threads of sarcode. Each segment thus isolated has its own proper calcareous envelope, which seems to be moulded (as it were) upon it; and this envelope or shell is perforated with minute parallel tubuli closely resembling those of dentine, except in the absence of bifurcation; the partition-walls between adjacent segments are consequently double, and are strengthened by an intermediate calcareous deposit, which is traversed by a system of inosculating passages that seems properly to belong to it. The form of the segments, their mode of communication, and consequently the general plan of growth, have a very considerable degree of constancy; and altogether the tendency is strongly manifested in this type to the greater individualization of the parts of the composite body, which in the preceding must be looked upon rather as constituting one aggregate whole. In the present memoir this contrast is fully carried out by a detailed comparison of two characteristic examples from these types respectively, each of them having its own features of peculiar interest.

scholarly journals Zanjabeel (Zingiber officinale Roscoe.): An Evidence-Based Review of Anti-nociceptive, Anti-inflammatory, Antioxidant, and Antimicrobial Properties

2021 ◽  
pp. 26-35
Author(s):  
Fatima Khan ◽  
Mohd Nayab ◽  
Abdul Nasir Ansari
Keyword(s):  
Therapeutic Potential ◽  
Antioxidant Properties ◽  
Plant Secondary Metabolites ◽  
Zingiber Officinale ◽  
Extensive Study ◽  
The Body ◽  
Wide Range ◽  
Zingiber Officinale Roscoe ◽  
Medicinal Properties ◽  
Anti Inflammatory

Ginger has been appreciated for over 2500-3000 years in many parts of the world due to its numerous scientific properties. The ginger plant (Zingiber officinale Roscoe) belongs to the Zingiberaceae family. It is a known food and flavoring ingredient reputed for its wide range of medicinal properties that have been widely used in Chinese, Ayurvedic, and Unāni Tibb worldwide, since antiquity. Ginger has long been used to cure a variety of ailments, including diarrhea, stomach discomfort, indigestion, and nausea. It is a versatile herb with phenomenal phytotherapeutic and medicinal properties. Active ingredients available in ginger such as 6-gingerol, 6-shogaol, 6-paradol, and zingerone are responsible for upgrading enzyme actions and balancing circulation through rejuvenating the body with physical re-strengthening. Gingerols, the key phenolic plant secondary metabolites responsible for its distinct flavor and health benefits, are found in the rhizome of ginger Extensive study has been undertaken over the last two decades to uncover bioactive ingredients and the therapeutic potential of ginger. This review considers ginger's chemical composition and the most recent study findings on its possible health advantages, such as analgesic, anti-inflammatory, antibacterial, and antioxidant properties due to its phytochemistry. Overall, clinical trials are needed to confirm these prospective various health advantages of ginger in human subjects and the most efficacious dosage, based on the current body of scientific literature.

scholarly journals The Chaetotaxy of the Pupa of Stegomyia fasciata

1920 ◽  
Vol 10 (2) ◽  
pp. 161-169 ◽  
Author(s):  
J. W. S. Macfie
Keyword(s):  
The Body ◽  
Posterior Angle ◽  
Image Position ◽  
The Right ◽  
Two Sides

The pupa is bilaterally symmetrical, that is, setae occur in similar situations on each side of the body, so that it will suffice to describe the arrangement on one side only. The setae on the two sides of the same pupa, however, often vary as regards their sub-divisions, and similar variations occur between different individuals; as an example, in Table I are shown some of the variations that were found in ten pupae taken at random. An examination of a larger number would have revealed a wider range. As a rule, a seta which is sometimes single, sometimes divided, is longer when single. For example, in one pupa the seta at the posterior angle ofthe seventh segment was single on the right side, double on the left; the former measuring 266μ, and the latter only 159μ in length. This fact is not specifically mentioned in the descriptions which follow, but should be understood.

The Evaporation of Water from the Cockroach

1935 ◽  
Vol 12 (4) ◽  
pp. 373-383 ◽  
Author(s):  
J. A. RAMSAY
Keyword(s):  
Wind Velocity ◽  
Body Surface ◽  
Periplaneta Americana ◽  
The Body ◽  
Tracheal System ◽  
Physical Systems ◽  
Change Of State ◽  
Fatty Substance ◽  
Effects Of Temperature ◽  
Rate Of Evaporation

1. The effects of temperature, humidity and wind velocity upon the rate of evaporation of water from the cockroach Periplaneta americana have been studied. 2. The effects of these factors upon the rate of evaporation from the tracheal system are shown to be similar to their effects upon purley physical systems. 3. The effects of these factors upon the rate of evaporation from the body surface are shown to be complicated by the presence of a film of fatty substance which undergoes a change of state at about 30° C.

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