scholarly journals Proteolytic digestion and the problem of the pancreas in the ammocoete larva of Lampetra planeri

1936 ◽  
Vol 121 (822) ◽  
pp. 221-232 ◽  
Keyword(s):  
Experimental Work ◽  
Digestive System ◽  
Experimental Methods ◽  
Proteolytic Digestion ◽  
Zymogen Granules ◽  
Early Date ◽  
Histological Studies ◽  
Lampetra Planeri ◽  
Peptic Digestion

Remarkably little experimental work has been carried out upon the digestive system of the Cyclostomata. Alcock (1899) described the occurrence of peptic digestion in the ammocoete, but in view of the early date of this work and of the fact that the protease of the Tunicata is now known to be of the tryptic rather than the peptic type (Yonge, 1925; Berrill, 1929) the matter seems to demand reinvestigation. Moreover, recent histological studies on the “ pancreas ” and intestine of lampreys, to be described below, have led to conclusions regarding the distribution of the zymogen cells which have not yet been tested by experimental methods. The present work deals with these two problems, to the significance of which attention has already been drawn elsewhere (Barrington, 1935), and provides also a basis for a comparison of proteolytic digestion in the Cyclostomata with that in the Tunicata and in the Pisces. The ammocoete larvae of Lampetra planeri used in this work have been collected from the River Itchen in Hampshire at various times between April and September. Material for sectioning has been fixed in Bouin’s solution, Lane’s fixative, mercuric formol, and in Susa’s solution, and subsequently stained on the slide with Mallory’s stain, Heidenhain's haematoxylin, and by Lane’s method for zymogen granules. The experimental methods will be described later.

Histological studies on development of the digestive system of Scortum barcoo

2010 ◽  
Vol 34 (2) ◽  
pp. 264-270
Author(s):  
Yu-jiang LUO ◽  
Kun-ci CHEN ◽  
Xin-ping ZHU ◽  
De-bo PAN ◽  
Ou-qin CHANG ◽  
...  
Keyword(s):  
Digestive System ◽  
Histological Studies

scholarly journals Professor Kudrevetski Vasily Vasilievich — Little Known Biography Facts

2021 ◽  
Vol 11 (3) ◽  
pp. 165-172
Author(s):  
M. Z. Gasanov ◽  
V. P. Terentyev
Keyword(s):  
Experimental Work ◽  
Digestive System ◽  
Doctoral Dissertation ◽  
Medical Faculty ◽  
Small Laboratory ◽  
Outstanding Scientist ◽  
Professional Activities ◽  
Fundamental Research ◽  
Scientific Ideas

The scientist’s professional activities were associated with the Imperial University of Warsaw, where he headed the department of the faculty therapeutic clinic (1895-1910), was the dean of the medical faculty and acting as the rector (1909-1910). Professor Kudrevetski V.V. was a scholar of an outstanding scientist, academician Pavlov I.P. Under his leadership in a small laboratory of the prof. S.P. Botkin clinic, they carried out the first fundamental research and experimental work on the physiology of digestion. The accumulated experience on this topic allowed Kudrevetski to defend his doctoral dissertation in 1890, the scientific consultant of which was Ivan Petrovich himself. The results of fundamental works of V.V. Kudrevetski formed the basis of scientific ideas about the physiology of the digestive system and have not lost their relevance today.

scholarly journals Experimental evaluation of amaranth food products in terms of functional food ingredients

2020 ◽  
Vol 17 ◽  
pp. 00147
Author(s):  
A.A. Stakhurlova ◽  
N. M. Derkanosova ◽  
A. V. Aristov ◽  
I. N. Ponomareva ◽  
A. A. Sutolkin
Keyword(s):  
Functional Food ◽  
Digestive System ◽  
Raw Materials ◽  
Food Products ◽  
Mature Male ◽  
Laboratory Animals ◽  
Whole Grain ◽  
Food Ingredients ◽  
Expected Effect ◽  
Histological Studies

Diet correction according to the nutrition enrichment with physiologically valuable nutrients becomes one of the most important issues. Its solution is possible by inclusion in the formulation of food products of raw materials that are characterized by an increased content of deficient substances, primarily protein, dietary fiber, minerals and vitamins. The amaranth meets the criteria above. The use of amaranth processing products in food technologies makes possible to obtain specialized and functional products. In this case, better to conduct experimental confirmation of the expected effect. Studies have been conducted to evaluate the effect of grain and extrudate of whole grain of Universal Amaranth on laboratory animals. Mature male rat’s stomach, liver, and kidneys served as a study material. The results of histological studies showed an improvement in the digestive system of animals and their general condition when grain and extrude Universal Amaranth was included in the diet.

Histological Investigation of the Digestive System and SEM Study of Radula in Fusinus nicobaricus (Gastropoda: Fasciolariidae)

2019 ◽  
Author(s):  
P Subavathy
Keyword(s):  
Digestive Gland ◽  
Digestive Enzymes ◽  
Digestive System ◽  
Histological Investigation ◽  
Histological Studies ◽  
Buccal Mass ◽  
Sem Study ◽  
Gland Tissue ◽  
Thin Walled ◽  
Carbohydrate Metabolites

In the present study, histological studies of the digestive system and SEM study of radula of Fusinus nicobaricus was evaluated. The digestive system contains proboscis, oesophagus, stomach, hepatopancreas, intestine, rectum and anus. The digestive tract of Fusinus nicobaricus encloses a buccal mass at the anterior region which contains a chitinous radula. The oesophagus leaved the buccal mass dorsally and passed the food into an extensible stomach. A pair of salivary gland lied with mid-oesophagus region. Digestive gland secreted digestive enzymes into the lumen of the stomach into mid region. Intestine was thin walled, usually long and possess loop through the digestive gland tissue and leaves as short rectum. Hepatopancreas was also implicated in storage and excretion of inorganic reserves, lipids and carbohydrate metabolites. Radula, a specific character and part of the appendices of digestive system of majority of molluscs. It was observed that the type of radula in F.n is rachiglossate with radular formula of 1+R+1.

scholarly journals DETERMINATION AND STUDY OF THE VOLUME AND DENSITY OF COMPLEX POROUS SAMPLES

2021 ◽  
Vol 73 (1) ◽  
pp. 110-113
Author(s):  
M.K. Kulbek ◽  
◽  
E. Dzhaksigeldinova ◽  
Keyword(s):  
Porous Materials ◽  
Experimental Method ◽  
Experimental Work ◽  
Complex Shape ◽  
Experimental Methods ◽  
Porous Sample ◽  
New Methods ◽  
Technical Properties ◽  
Comprehensive Study

Various porous materials are widely used in various industries, such as chemical, metallurgical, energy, light, food, etc. Therefore, a comprehensive study of their structure and physical and technical properties is of great scientific and technological importance. The article presents the results of determining and studying the volume and density of porous sample materials using a new experimental method. The determination of the volume and density of waterproof samples of any complex shape can be easily determined on the basis of Archimedes ' law. However, it is impossible to determine the volume and density of porous water-absorbing samples of complex shape directly using this law. The article presents new experimental methods (methods) for determining the volume and density of such porous samples of complex shape. The results of experimental work carried out using the proposed new methods are presented and analyzed.

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