Functional characteristics of the hippocampus after visual deafferentation in early ontogeny

The aim of this work was to study peculiarities of mullet morphological organization during early ontogeny. Sample selection was made on board Caspian research and development Institute of Fisheries’ research vessel in period from June to September, 2015 in Russian waters of the Caspian Sea. Larvae aged 10 days could be characterized by heterochrony in the development of major organ systems. Nervous system and sense organs were well developed. The eyeball had all membranes well-differentiated, in the retina all the layers were formed. The olfactory fossae had cells of 3 types: olfactory receptor cells, supporting cells and basal cells. There was observed intensive formation of respiratory, cardiovascular, excretory and digestive systems. The early development of the nervous system and sensory organs of the larvae indicated adaptation of mullet to active life.

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EMBRYONIC HAEMOPOIESIS IN EARLY ONTOGENY OF AFRICAN CATFISH (CLARIAS GARIEPIUS)

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2017-3-113-121 ◽

2017 ◽

pp. 113-121

Author(s):

Anna Viktorovna Pirog ◽

Olga Vladimirovna Lozhnichenko

Keyword(s):

Blood Cells ◽

Closed Loop ◽

Early Ontogeny ◽

Water Systems ◽

African Catfish ◽

Transport Function ◽

Summer Period ◽

Active Feeding ◽

Hemopoietic Organ ◽

Hemopoietic Organs

The study of the growth of blood cells and hemopoietic organs of claravia catfish ( Clarias gariepius ) grown in the closed loop water systems on the basis of "RANTOP AGRO-5" LLC in the Krasnodar region. Test materials (prolarvae and larvae aged 5, 10, 15, 20 and 25 days of active feeding) were selected in the spring-summer period of 2013-2014. Prolarvae in mesenchyma of forming mesonephros which begins to develop after hatching had primordial precursor cell and blast blood cells between forming vesicles. There took place differentiation of erythropoietic cells: erythroblasts, pronormoblasts and basophilic normoblasts. Accumulation of hemoglobin in erythrocytes indicates that since the first day of hatching, the blood starts to perform transport function - transportation of oxygen. The rudiment of thymus was observed in larvae aged 10 days. This organ generated lymphocytepoietic cells. The central hemopoietic organ - spleen - was originally registered as a mesenchymal rudiment at the age of 10 days. At the age of 25 days, development of the organ stroma is not finished in clarid catfish larvae. Reticular tissues develop actively. Separate lymphoid clumps in the spleen structure have not been found. Melano-macrofagic centres are also unformed. Qualitative analysis of haemopoiesis showed that in spleen there take place development of all types of blood cells: erythropoiesis, granulopoiesis and agranulopoiesis.

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THE BASIC DIRECTIONS OF PERFECTION OF TAX SYSTEM

Modern problems of an economic safety, accounting and the right in the Russian Federation. Vol.4 ◽

10.26526/conferencearticle_5c50616eb45593.78755873 ◽

2018 ◽

Author(s):

Вера Шумилина ◽

Vera Shumilina ◽

Анастасия Борзых ◽

Anastasia Borzykh ◽

Александр Трандофилов ◽

...

Keyword(s):

Russian Federation ◽

The State ◽

Functional Characteristics ◽

Tax System ◽

The Russian Federation

The article discusses the features and main ways to improve the functioning of the tax system of the Russian Federation. The main criteria of functional characteristics of the category of taxes are revealed. The main directions of management of the tax system in the financial activities of the state. The most effective measures to improve the tax system are identified.

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