Studies on the Physiology of Digestion in Corophium Volutator

Author(s):  
V. P. Agrawal

It has been observed that the pH in the different parts of the alimentary canal of Corophium is nearer neutrality; while the medium in the ventral hepatopancreatic caeca is more acidic, being in the neighbourhood of 6.2.Investigations on the qualitative estimation of enzymes indicate that none of the enzymes are secreted by the gut proper. However, the ventral caeca only secrete many of the carbohydrate splitting enzymes; proteases and lipase are also secreted by the caecal cells of CorophiumIt has also been estimated that the optimum pH for the activity of the caecal amylase lies in the neighbourhood of 5.8.

2017 ◽  
Vol 44 (2) ◽  
pp. 245-254
Author(s):  
Rimi Farhana Zaman ◽  
Ameena Khatun ◽  
Shahela Alam ◽  
Farhana Muznebin ◽  
Hamida Khanum

Investigation on gastrointestinal helminths was conducted on 20 domestic fowl, 20 white leghorn, 20 layer and 20 cock of Dhaka city. Six species of helminth belonging to trematode, cestode and nematode were found to infect the different parts of alimentary canal of domestic fowl. The prevalence of helminths in domestic fowl were as follows: Catatropis verrucosa (25%), Amoebotaenia sphenoides (10%), Hymenolepis cantaniana (35%), Rallietina echinobothrida (55%), Ascardia galli (70%) and Heterakis gallinarum (30%) whereas, in white leghorn the prevalence of Rallietina echinobothrida (20%) and Ascardia galli (35%) were recorded. In layer, higher prevalence of Rallietina echinobothrida (55%) and Ascardia galli (60%) were recorded; in cock the prevalence of specific helminthes were as follows: Hymenolepis cantaniana (10%), Rallietina echinobothrida (40%), Cotugnia digonopora (20%), Ascardia galli (60%) and Heterakis gallinarum (25%). Along with the prevalence and intensity of infestation of different species of parasites, intensity were also recorded. Highest number of parasites were collected from intestine.Bangladesh J. Zool. 44(2): 245-254, 2016


1958 ◽  
Vol 90 (4) ◽  
pp. 202-212 ◽  
Author(s):  
R. N. Sinha

The time required for passage of food through various segments of the alimentary canal is important in understanding the process of digestion in insects. Abbott (1926) gave some information on this subject in connection with his study of the physiology of digestion in the Australian roach, Perqlaneta australasiae Fab. Snipes and Tauber (1937), have recorded the time required for passage and ejection of one type of food in the American cockroach, P. americana L. Later Day and Powning (1949) studied the time taken for starch paste to reach different parts of the alimentary canal of the German cockroach, Blattella germmica (L.). But any information in this respect seems to be lacking in numerous species of insects other than the cockroach. This study was undertaken to determine the time required to reach various points of the gut of small stored grain beetles, to find out the difference in the time requirement between two closely related species living on same diet and between large and small insects. Investigations were also made to locate the region of mixing in the gut of two subsequent meals, to understand the significance of certain anatomical structures in the gut in relation to the movement of food. The adult beetles used in these experiments were, Tribolium confusum Duv., T. castaneum Herbst (Fam. Tenebrionidae), Oryzaephilus surinamensis (L.), O. mercator (Fauval) and Laemophloeus pusilloides Steel and Howe (Fam. Cucujidae).


1887 ◽  
Vol 41 (246-250) ◽  
pp. 173-181 ◽  

The differences of opinion among pathologists as to the relation of certain micro-organisms,—and more especially of a curved bacillus described by Koch—to Cholera Asiatica, led to our being deputed last summer, by the Association for the Promotion of Research in Medicine, acting in conjunction with the Royal Society and University of Cambridge, to proceed to Spain to make further investigations on the subject. In Madrid we were able to make autopsies on twenty-five typical cases of cholera, the post-mortem examinations being made in many of them either immediately after death or w ithin very few hours of it. Our attention was at first directed chiefly to the relation of the comma bacillus of Koch to Cholera Asiatica. Early in our inquiries we were struck by the fact th at Koch’s comma bacillus is not discoverable in the intestinal contents of all cases of cholera. W e employed much time and care in the examination of thin dried films of the mucous flakes and fluid contained in the intestine, these films being stained by methods which we knew to be well fitted to show the comma bacillus if that micro-organism were present. Such films from one or two fatal cholera cases showed that the intestinal contents contained enormously larger numbers of comma bacilli than of other parasites. In some of the cases the comma bacillus, though certainly present, was not the most marked feature in the preparation, and in certain of these cases we were only able to find these bacilli after prolonged and careful searching. In many cases of undoubted Cholera Asiatica where death occurred before the reaction stage had set in, we were unable to detect comma bacilli in any of the films or cultures prepared from the intestinal contents taken from different parts of the alimentary canal.


2021 ◽  
Vol 49 (1) ◽  
pp. 35-46
Author(s):  
Hamida Khanum ◽  
Sharmin Musa ◽  
Monirul Islam ◽  
Romana Akter ◽  
Fahmida Sarker

A comparative study was carried out to investigate the gastrointestinal helminth infection in domestic fowls Gallus gallus (30 specimens) and ducks Anas platyrhynchos (30 specimen). A total of 1610 helminth parasites of eight species from three taxonomic classes were recovered and identified from the different parts of alimentary canal. Among the parasitic group the cestodes were turned out to be predominant with a prevalence of 50.93% (820) whereas, the rate was 27.97% (450) and 21.19% (340) in nematodes and trematodes, respectively. The prevalence of parasites species were Ascaridia galli (80%), Echinostoma revolutum (73.33%), Raillientina echinobothrida (53.33%), Echinoparyphium recurvatum (53.33%), Cotugnia digonophora (50%), Amoebotaenia sphenoids (30%), Ascaridia hermaphoridita (43.33%) and Hymenolepis cantania (26.67%). The rate of infestation was higher (90%) in fowls than in ducks (80%) and the intensity of infections was slightly higher in ducks 31.67 (31.48 in domestic fowls). In both domestic fowls and ducks, cestode parasites were most dominant, and prevalence (83.33% and 16.80±4.31) and intensity were lower in fowls than in ducks (76.67% and 17.39 ± 4.2 2). Highest rate of infestation was observed in summer both in fowl (81.82%) and duck (70%) while, winter was associated with peak intensity of parasites in fowl (46.67) and in duck (44.28) observed in summer. The prevalence of parasites was higher in caecum of both domestic fowls and ducks. Bangladesh J. Zool. 49(1): 35-46, 2021


Author(s):  
Virginia TASSINARI ◽  
Ezio MANZINI ◽  
Maurizio TELI ◽  
Liesbeth HUYBRECHTS

The issue of design and democracy is an urgent and rather controversial one. Democracy has always been a core theme in design research, but in the past years it has shifted in meaning. The current discourse in design research that has been working in a participatory way on common issues in given local contexts, has developed an enhanced focus on rethinking democracy. This is the topic of some recent design conferences, such PDC2018, Nordes2017 and DRS2018, and of the DESIS Philosophy Talk #6 “Regenerating Democracy?” (www.desis-philosophytalks.org), from which this track originates. To reflect on the role and responsibility of designers in a time where democracy in its various forms is often put at risk seems an urgent matter to us. The concern for the ways in which the democratic discourse is put at risk in many different parts of the word is registered outside the design community (for instance by philosophers such as Noam Chomsky), as well as within (see for instance Manzini’s and Margolin’s call Design Stand Up (http://www.democracy-design.org). Therefore, the need to articulate a discussion on this difficult matter, and to find a common vocabulary we can share to talk about it. One of the difficulties encountered for instance when discussing this issue, is that the word “democracy” is understood in different ways, in relation to the traditions and contexts in which it is framed. Philosophically speaking, there are diverse discourses on democracy that currently inspire design researchers and theorists, such as Arendt, Dewey, Negri and Hardt, Schmitt, Mouffe, Rancière, Agamben, Rawls, Habermas, Latour, Gramsci, whose positions on this topic are very diverse. How can these authors guide us to further articulate this discussion? In which ways can these philosophers support and enrich design’s innovation discourses on design and democracy, and guide our thinking in addressing sensitive and yet timely questions, such as what design can do in what seems to be dark times for democracy, and whether design can possibly contribute to enrich the current democratic ecosystems, making them more strong and resilient?


2018 ◽  
Vol 11 (1-2) ◽  
pp. 257-278 ◽  
Author(s):  
Shirzad Azad

In spite of her troubled presidency at home and premature, ignominious exit from power, Park Geun-hye made serious attempts to bolster the main direction of the Republic of Korea’s (ROK) foreign policy toward the Middle East. A collaborative drive for accomplishing a new momentous boom was by and large a dominant and recurring theme in the Park government’s overall approach to the region. Park enjoyed both personal motivation as well as politico-economic justifications to push for such arduous yet potentially viable objective. Although the ROK’s yearning for a second boom in the Middle East was not ultimately accomplished under the Park presidency, nonetheless, the very aspiration played a crucial role in either rekindling or initiating policy measures in South Korea’s orientation toward different parts of a greater Middle East region, extending from the Gulf Cooperation Council (GCC) to Morocco.


1968 ◽  
Vol 29 (2) ◽  
pp. 308-312
Author(s):  
Ronald G. Elmslie ◽  
Nanette Harvey

1963 ◽  
Vol 42 (2) ◽  
pp. 214-224
Author(s):  
Raymond C. Mellinger ◽  
Jalileh A. Mansour ◽  
Richmond W. Smith

ABSTRACT A reference standard is widely sought for use in the quantitative bioassay of pituitary gonadotrophin recovered from urine. The biologic similarity of pooled urinary extracts obtained from large numbers of subjects, utilizing groups of different age and sex, preparing and assaying the materials by varying techniques in different parts of the world, has lead to a general acceptance of such preparations as international gonadotrophin reference standards. In the present study, however, the extract of pooled urine from a small number of young women is shown to produce a significantly different bioassay response from that of the reference materials. Gonadotrophins of individual subjects likewise varied from the multiple subject standards in many instances. The cause of these differences is thought to be due to the modifying influence of non-hormonal substances extracted from urine with the gonadotrophin and not necessarily to variations in the gonadotrophins themselves. Such modifying factors might have similar effects in a comparative assay of pooled extracts contributed by many subjects, but produce significant variations when material from individual subjects is compared. It is concluded that the expression of potency of a gonadotrophic extract in terms of pooled reference material to which it is not essentially similar may diminish rather than enhance the validity of the assay.


2012 ◽  
Vol 153 (16) ◽  
pp. 607-614
Author(s):  
Tibor Wittmann

The extent and severity of motility disorders remains heterogeneous in the different parts of the gut, and in most cases failures in gut motility do not correspond with the severity of the symptoms. If diarrhea or fecal incontinence is the leading symptom, or the blood glucose level varies frequently and considerably despite the treatment efforts, the motility of the stomach and bowels is seriously disturbed. The clinical aspects, detailed pathogenesis, diagnostic approach and treatment modalities of gastrointestinal motility disorders in diabetes mellitus are reviewed to help and improve the everyday medical practice. Orv. Hetil., 2012, 153, 607–614.


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