Memoirs: The Alimentary Canal and Pro-epithelial Regeneration in Coccinella septempunctata with a comparison of Carnivorous and Herbivorous Coccinellids

1939 ◽  
Vol s2-81 (323) ◽  
pp. 451-478
Author(s):  
S. PRADHAN
Keyword(s):  
Alimentary Canal ◽  
Coccinella Septempunctata ◽  
The Other ◽  
Detailed Account ◽  
Nerve Supply ◽  
Epithelial Regeneration ◽  
Gut Epithelium

The paper incorporates: 1. The anatomy of the alimentary canal of Coccinella septempunctata as a type of carnivorous Coccinellid. 2. A detailed account of the extrinsic musculature and the nerve-supply of the cephallic stomodaeum, which have been studied in very few insects and never in Coccinellids. 3. The histology of the alimentary canal, specially the midgut, distinguishing four definite types of epithelium, one of which is surprisingly peculiar and has not been described before. This type of epithelium shows apparently two layers of cells, one superimposed over the other, the outer having large, regularly arranged, intercellular vacuoles as have not been described before, at least in the gut of insects. 4. A discussion on the relations of the four types of epithelium to one another, recognizing that this peculiar type of epithelium is just a phase in a unique process of Pro-epithelial Regeneration in the mid-gut epithelium. 5. A comparison of the chief characteristics of the alimentary canal of carnivorous and herbivorous Coccinellids based on the study of seven species of lady-bird beetles. 6. Probable explanations of the differences between the alimentary canals of the carnivorous and herbivorous Coccinellids.

Lorenzo at ‘The Theatre’ Meeting actors and audience

2018 ◽  
pp. 13-38
Author(s):  
N. Ceramella
Keyword(s):  
Social Structure ◽  
Social Situation ◽  
The Other ◽  
Detailed Account ◽  
The Social ◽  
New Perspective ◽  
The One

The article considers two versions of D. H. Lawrence’s essay The Theatre: the one which appeared in the English Review in September 1913 and the other one which Lawrence published in his first travel book Twilight in Italy (1916). The latter, considerably revised and expanded, contains a number of new observations and gives a more detailed account of Lawrence’s ideas.Lawrence brings to life the atmosphere inside and outside the theatre in Gargnano, presenting vividly the social structure of this small northern Italian town. He depicts the theatre as a multi-storey stage, combining the interpretation of the plays by Shakespeare, D’Annunzio and Ibsen with psychological portraits of the actors and a presentation of the spectators and their responses to the plays as distinct social groups.Lawrence’s views on the theatre are contextualised by his insights into cinema and its growing popularity.What makes this research original is the fact that it offers a new perspective, aiming to illustrate the social situation inside and outside the theatre whichLawrenceobserved. The author uses the material that has never been published or discussed before such as the handwritten lists of box-holders in Gargnano Theatre, which was offered to Lawrence and his wife Frieda by Mr. Pietro Comboni, and the photographs of the box-panels that decorated the theatre inLawrence’s time.

scholarly journals Taking a Step Back: Insights into the Mechanisms Regulating Gut Epithelial Dedifferentiation

2021 ◽  
Vol 22 (13) ◽  
pp. 7043
Author(s):  
Shaida Ouladan ◽  
Alex Gregorieff
Keyword(s):  
Cell Fate ◽  
Hormonal Regulation ◽  
Transcriptional Profiling ◽  
Cell Types ◽  
Lineage Tracing ◽  
Intestinal Stem Cells ◽  
Physical Damage ◽  
Epithelial Regeneration ◽  
Gut Epithelium ◽  
Stem Cell Populations

Despite the environmental constraints imposed upon the intestinal epithelium, this tissue must perform essential functions such as nutrient absorption and hormonal regulation, while also acting as a critical barrier to the outside world. These functions depend on a variety of specialized cell types that are constantly renewed by a rapidly proliferating population of intestinal stem cells (ISCs) residing at the base of the crypts of Lieberkühn. The niche components and signals regulating crypt morphogenesis and maintenance of homeostatic ISCs have been intensely studied over the last decades. Increasingly, however, researchers are turning their attention to unraveling the mechanisms driving gut epithelial regeneration due to physical damage or infection. It is now well established that injury to the gut barrier triggers major cell fate changes, demonstrating the highly plastic nature of the gut epithelium. In particular, lineage tracing and transcriptional profiling experiments have uncovered several injury-induced stem-cell populations and molecular markers of the regenerative state. Despite the progress achieved in recent years, several questions remain unresolved, particularly regarding the mechanisms driving dedifferentiation of the gut epithelium. In this review, we summarize the latest studies, primarily from murine models, that define the regenerative processes governing the gut epithelium and discuss areas that will require more in-depth investigation.

Did Ground Cover Change Over Geologic Time?

2000 ◽  
Vol 6 ◽  
pp. 171-182 ◽  
Author(s):  
Ben A. LePage ◽  
Hermann W. Pfefferkorn
Keyword(s):  
Fossil Record ◽  
Ground Cover ◽  
The Other ◽  
Detailed Account ◽  
Geologic Time ◽  
The Past ◽  
Other Hand ◽  
Plant Fossil

When one hears the term “ground cover,” one immediately thinks of “grasses.” This perception is so deep-seated that paleobotanists even have been overheard to proclaim that “there was no ground cover before grasses.” Today grasses are so predominant in many environments that this perception is perpetuated easily. On the other hand, it is difficult to imagine the absence or lack of ground cover prior to the mid-Tertiary. We tested the hypothesis that different forms of ground cover existed in the past against examples from the Recent and the fossil record (Table 1). The Recent data were obtained from a large number of sources including those in the ecological, horticultural, and microbiological literature. Other data were derived from our knowledge of Precambrian life, sedimentology and paleosols, and the plant fossil record, especially in situ floras and fossil “monocultures.” Some of the data are original observations, but many others are from the literature. A detailed account of these results will be presented elsewhere (Pfefferkorn and LePage, in preparation).

scholarly journals XIX. On the difference of meridians of the Royal Observatories of Greenwich and Paris

1827 ◽  
Vol 117 ◽  
pp. 286-296 ◽  
Keyword(s):  
The Other ◽  
Detailed Account ◽  
Sidereal Time ◽  
Methods Of Calculation ◽  
Royal Observatory ◽  
The Difference ◽  
Made In

In the Philosophical Transactions for 1826, Part II. Mr. Herschel has given a detailed account of observations, which were made in the month of July, 1825, for the purpose of ascertaining the difference of the meridians of the Royal Observatories of Greenwich and Paris, with a computation of these observations, from which the most probable value of the difference of longitude appears to be 9 m 21 s. 6. But I have perceived that in the copy of the observations delivered to him from the Royal Observatory of Greenwich, an error of one second has been committed; as the true sidereal time of the observation made there on 21st July, ought to be 17 h 38 m 57·12 in place of 17 h 38 m 56 s. 10, set down in the Table p. 104, which he informs me was computed at the Observatory, and officially communicated to him from the Astronomer Royal. This error seems to have had its origin in the little Table at the bottom of page 103; for, on subtracting the error of the clock, 47 s. 37, from the time 18 h 8 m 30 s. 40, the true sidereal time is 18 h 7 m 43 s. 03, instead of 18 h 7 m 42 s. 03, there given. The error in the result of that day’s observations, arising from this cause, has been partly compensated by a mistake of three tenths of a second, which has occurred in calculating the combined observations of the same day, the gain of mean on sidereal time being stated to be — 4 s. 54 (pp. 120 and 122), in place of — 4 s. 24. On checking the other observations, a few trifling alterations appear to be necessary upon the Greenwich Table of sidereal time, from the data given along with it. These seem to be occasioned by different methods of calculation, and indeed are hardly worthy of notice. The French astronomers not having given the data on which the calculations of the sidereal times at Paris are founded, they are assumed to be correct.

Peirce’s legacy for contemporary consciousness studies, the emergence of consciousness from qualia, and its evanescence in habits

Semiotica ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Winfried Nöth
Keyword(s):  
Phenomenological Approach ◽  
Self Control ◽  
The Other ◽  
Detailed Account ◽  
Human Consciousness ◽  
States Of Mind ◽  
Self Reflection ◽  
Physical Universe ◽  
Consciousness Studies ◽  
Nonhuman Animals

Abstract The paper argues that contemporary consciousness studies can profit from Charles S. Peirce’s philosophy of consciousness. It confronts mainstream tendencies in contemporary consciousness studies, including those which consider consciousness as an unsolvable mystery, with Peirce’s phenomenological approach to consciousness. Peirce’s answers to the following contemporary issues are presented: phenomenological consciousness and the qualia, consciousness as self-controlled agency of humans, self-control and self-reflection, consciousness and language, self-consciousness and introspection, consciousness and the other, consciousness of nonhuman animals, and the question of a quasi-consciousness of the physical universe. A detailed account of Peirce’s three modes of consciousness is presented: (1) primisense, qualisense or feeling-consciousness, (2) altersense (consciousness of the other), and (3) medisense, the consciousness of cognition, thought, and reasoning. In contrast to consciousness studies that establish a rather sharp dividing line between conscious and unconscious states of mind, Peirce adopts the principle of synechism, the theory of continuity. For him, consciousness is a matter of degree. An important difference between Peirce’s concept of qualia and current theories of qualia in human consciousness is discussed. The paper shows how consciousness, according to Peirce, emerges from unconscious qualia and vanishes into equally unconscious habits. It concludes with a study of the roles of qualia, habit, and self-control in Peirce’s theory of signs, in particular in qualisigns and symbols, and the question of signs as quasi-conscious agents in semiosis.

scholarly journals The use of ceiling temperature and reactivation in the isolation of pox virus hybrids

1964 ◽  
Vol 62 (2) ◽  
pp. 133-140 ◽  
Author(s):  
K. R. Dumbell ◽  
H. S. Bedson
Keyword(s):  
Active State ◽  
The Other ◽  
Detailed Account ◽  
Parental Virus ◽  
Simple Method ◽  
Ceiling Temperature ◽  
Temperature Heat

A simple method for the isolation of pox virus hybrids on the C.A.M. has been described. One parental virus was used as a heat-inactivated suspension. The other parent was used in the active state, but at a temperature higher than its ceiling temperature. Under these conditions the inactive parent was reactivated so that pocks resulted only from the cells infected with both parental viruses. Many of these pocks were unlike those of either parent. Such lesions were found to contain a high proportion of hybrids. In these experiments, alastrim was crossed with rabbit pox and variola major with cowpox.The term ‘heat-tethered’ has been used to describe virus whose intracellular cycle of development has been arrested by incubation at too high a temperature. Heat-tethered virus has interesting properties and two of these have been described. When the temperature is lowered, heat-tethered virus will start to grow again. Its reactivating potential has been mentioned above. A more detailed account of the properties of heat-tethered virus is being prepared.

On Probstmayria reptiliae n. sp., from Homopus femoralis and Some Notes on the Genus Probstmayria

1958 ◽  
Vol 32 (4) ◽  
pp. 211-218 ◽  
Author(s):  
W. M. Fitzsimmons
Keyword(s):  
South Africa ◽  
Alimentary Canal ◽  
The Other ◽  
Free State ◽  
The Subject

This worm was very abundant in the rectum of a tortoise, Homopus femoralis, from the Bloemfontein area, Orange Free State, South Africa. It was found together with several other oxyurids the description of which will form the subject of a later paper. Although the Probstmayria far exceeded the other oxyurids in number, male specimens of this genus were extremely rare for only one male was found after a prolonged search during the course of which many hundreds of females were encountered. In order that no specimens should be lost the entire alimentary canal together with its contents was submerged in hot 70% alcohol after scraping the mucosa.

Transport of Food Through the Alimentary Camals of Aquatic Annelids

1948 ◽  
Vol s3-89 (5) ◽  
pp. 47-51
Author(s):  
JEAN HANSON
Keyword(s):  
Alimentary Canal ◽  
Anterior Part ◽  
Gut Contents ◽  
Ciliated Epithelium ◽  
Gut Epithelium ◽  
The University ◽  
Anterior Direction ◽  
Metachronal Waves ◽  
Muscle Coat ◽  
Made In

1. In most serpulids and sabellids the only muscle coat in the wall of the alimentary canal lies outside the blood sinus which envelops it. In a few sabellids there is another muscle coat, of unknown function, between the sinus and the gut epithelium. 2. The muscles outside the sinus contract antiperistaltically and tend to hinder the transport of the gut contents towards the anus. 3. The contents of the alimentary canal are transported by its cilia which beat towards the anus. The metachronal waves of the ciliated epithelium travel in a postero-anterior direction. The ‘ascending ciliary current’ of Stephenson (1913) does not exist. 4. The food boli of serpulids and sabellids rotate as they move down the gut. In Salmacina incrustans the rotation is imparted by cilia in the anterior part of the gut. These observations were made in the Zoological Station of Naples. I wish to record my gratitude to the staff of the Station, to the British Association for the Advancement of Science for the use of its Table, and to the University of London for a grant towards travelling expenses.

II. Note on the separation of the isomeric amylic alcohols formed by fermentation

1869 ◽  
Vol 17 ◽  
pp. 308-309
Keyword(s):  
Polarized Light ◽  
The Other ◽  
Detailed Account ◽  
The One

At present we are acquainted with two amylic alcohols formed by fermentation. They were discovered by Pasteur, who observed that different specimens of amylic alcohol caused a ray of polarized light to rotate to dif­ferent degrees. He succeeded in devising a separation of these alcohols, which consisted in converting them into sulphamylates of barium and re­crystallizing these salts. The one alcohol is without action on polarized light, and the other rotates it. This method of separation is beset with great practical difficulties, and has, we believe, only once been repeated, viz. by Mr. Pedler. He gives no detailed account of the separation, but gives some of the leading properties of the alcohols. He found that the rotating alcohol caused a ray of polarized light to rotate 17° with a column of 500 millims. of liquid. The following are some examples of the rotations effected by eleven different samples of amylic alcohol in a column of 385 millims. For compa­rison with Pedler’s number, the observed numbers have been reduced in the second column to observations on 500 millims.

scholarly journals V. Preliminary note on the ossification of the terminal pha­langes of the digits

1880 ◽  
Vol 30 (200-205) ◽  
pp. 550-550
Keyword(s):  
The Other ◽  
Detailed Account ◽  
Long Bones ◽  
Intramembranous Ossification ◽  
Preliminary Note

The diaphyses of the ungual phalanges of the digits offer an excep­tion to the usual mode of ossification of diaphysial bones (including the other phalanges) in the fact that the calcification of the cartilage and its attendant changes begins at the tip and not in the centre of the diaphysis. The subperiosteal intramembranous ossification also commences at the same point—the tip, namely, of the cartilage—as a cap-like expansion over the end of the cartilage. The irruption of the osteoblastic subperiosteal tissue also first occurs here, so that this part seems to correspond morphologically with the centre of the shaft of other long bones. The expanded portion of the phalanx which bears the nail, claw, or hoof, is entirely formed by an outgrowth of the sub­periosteal bone, and is not preceded by cartilage. A detailed account of the mode of ossification of these phalanges will be shortly published.

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