THE EMBRYONIC PERIOD

2010 ◽  
pp. 58-74
Keyword(s):  
Embryonic Period

BIOLOGICAL LAWS OF DEVELOPMENT OF THE FETUS IN CATTLE IN THE EMBRYONIC PERIOD OF ONTOGENESIS

2018 ◽  
Vol 6 (3) ◽  
pp. 83-85
Author(s):  
N.G. Fenchenko ◽  
◽  
N.I. Khairullina ◽  
D.H. Shamsutdinov ◽  
◽  
...  
Keyword(s):  
Embryonic Period ◽  
Biological Laws

Virtual ultrasound embryo autopsy – myth or reality? Part 1

2017 ◽  
Author(s):  
A.Yu. Blinov
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Prenatal Diagnosis ◽  
Medical Imaging ◽  
Embryonic Development ◽  
Human Embryos ◽  
Review Of Literature ◽  
Embryonic Period ◽  
New Methods ◽  
Central Nervous System Defects

A review of literature data on the study of human embryos using new methods of medical imaging is given. The possibility of prenatal diagnosis of severe central nervous system defects has been demonstrated already in the embryonic period at 8–10 weeks of gestation or at the age of 16 to 23 stages of the embryonic development period

Iron overload during the embryonic period develops hyperactive like behavior and dysregulation of biogenic amines in Drosophila melanogaster

2021 ◽  
Vol 475 ◽  
pp. 80-90
Author(s):  
Márcia Rósula Poetini ◽  
Elize Aparecida Santos Musachio ◽  
Stífani Machado Araujo ◽  
Francielli Polet Almeida ◽  
Mustafa Munir Mustafa Dahleh ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Iron Overload ◽  
Biogenic Amines ◽  
Embryonic Period

The development of the tensor vastus intermedius during the human embryonic period and its clinical implications

2021 ◽  
Author(s):  
Natsuko Utsunomiya ◽  
Ryota Kodama ◽  
Yutaka Yamaguchi ◽  
Itaru Tsuge ◽  
Shigehito Yamada
Keyword(s):  
Clinical Implications ◽  
Embryonic Period ◽  
Vastus Intermedius

Growth and Asymmetry of the Human Liver During the Embryonic Period

1988 ◽  
Vol 8 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Grover M. Hutchins ◽  
G. William Moore
Keyword(s):  
Human Liver ◽  
Embryonic Period

Influence of ionizing radiations on the development of the nervous system

1967 ◽  
Vol 16 (3) ◽  
pp. 275-309 ◽  
Author(s):  
W. Geets
Keyword(s):  
Nervous System ◽  
Cerebral Cortex ◽  
Research Work ◽  
Low Doses ◽  
Embryonic Period ◽  
Clinical Observations ◽  
Functional Maturation ◽  
Maturation Stages ◽  
Mother Cells ◽  
Ionizing Radiations

SUMMARYThe first cellular differentiation in the process of segmentation leads to the embryonic period, the major organogenetic period for the nervous system. In man, it appears between the second and the eighth week after conception.During the foetal and perinatal periods, the nervous organization mainly develops at the cerebellum and cerebral cortex levels. The cerebrum functional maturation continues well beyond birth.Neuroblasts are the most widespread mother-cells in the developing nervous system during the embryonic period, but some are still to be found after birth.Animal experiment has demonstrated that ionizing radiations were able to disorganize neurogenesis in any of its maturation stages, even at very low doses. It is possible to establish a chronological table showing the anatomical or functional deformities in relation with the embryonic age at which rays have been given.It appears that in man the most dangerous period is between the beginning of the second and the end of the eighth week after conception. At that moment, pregnancy is often ignored and a dose of 20 to 40 r is sufficient to entail serious damages, such as microcephaly, protrusions of the brain or mental retardation. On drawing near to birth the foetal or neonatal nervous system of rodents or primates is still radiosensitive, especially at the cerebral cortex level and the consequences will be of a neurophysiologic or psychosensorial nature. Certain embryopathies or neurologic alterations would only be apparent in subsequent generations, following mutations induced into the mother-cells of the nervous system. Genetic deformities of the nervous system can also result from moderate irradiations of the gonads.Further to the precise experimental research work on the radiovulnerability of the embryonic or foetal nervous system of the animal, certain clinical observations are presented, which lead to similar conclusions.The atomic bombardments have caused numerous neurological trouble among the children who had been irradiated in utero. And the genetic effects are not yet perfectly known to-date.This set of experimental and clinical data must prompt us to be very careful when using ionizing radiations, even at low doses, in pregnant women and newborn.

scholarly journals Biology of Diadiplosis multifila (Diptera: Cecidomyiidae) in Planococcus citri under constant temperatures

2019 ◽  
Vol 10 (3) ◽  
pp. 346-352
Author(s):  
Alexandre Martins Dos Santos ◽  
José Eudes De Morais Oliveira ◽  
Andréa Nunes Moreira de Carvalho ◽  
Martin Duarte De Oliveira ◽  
Carla Patrícia Oliveira de Assis ◽  
...  
Keyword(s):  
Life Cycle ◽  
Sex Ratio ◽  
Larval Stage ◽  
Pupal Stage ◽  
Planococcus Citri ◽  
Egg Viability ◽  
Northeast Region ◽  
Embryonic Period ◽  
Semi Arid ◽  
Total Life

Diadiplosis multifila was recently discovered feeding on Planococcus citri eggs in vineyards in the semi-arid northeast region of Brazil. The objective of the present paper was to study the biology of D. multifila in P. citri under constant temperatures of 22, 25, 28, and 31 °C. We evaluated its embryonic stage, egg viability, development period, survival of larva and pupa, longevity, average number of eggs, and sex ratio. D. multifila completed its life cycle in all temperatures except for 31 °C. The length of the embryonic period ranged from 4 to 7 days. The larval stage was longer at a temperature of 22 °C (8.6 days) and shorter at 28 °C (6.4). The pupal stage exhibited durations of 12.9, 10.4, and 8.2 days for temperatures of 22, 25, and 28 °C, respectively. The average viability in the larval stage was 97% and 83% in the pupal stage. The total life cycle took 16.7 (28 °C), 20 (25 °C), and 27 (22 °C) days to complete. The adults lived for approximately 2 days and the females produced on average 34, 25, and 19 eggs at temperatures of 22, 25, and 28 °C, respectively. The sex ratio varied from 0.46 to 0.54.

scholarly journals Invasive Diagnostic Procedures in Embryonic Period

2021 ◽  
Vol 15 (2) ◽  
pp. 169-174
Author(s):  
Giovanni Monni ◽  
Valentina Corda ◽  
Francesca Dessolis ◽  
Alba Piras
Keyword(s):  
Diagnostic Procedures ◽  
Embryonic Period

Ventral Cleft of the Larynx in an Adult

1989 ◽  
Vol 98 (1) ◽  
pp. 66-69 ◽  
Author(s):  
Joyce A. Schild ◽  
Mahmood F. Mafee
Keyword(s):  
Computed Tomography ◽  
Case Report ◽  
Ct Scan ◽  
Thyroid Cartilage ◽  
Adult Form ◽  
Embryonic Period ◽  
Whole Mount

Congenital clefts of the larynx are rare and usually found dorsally. This case report describes a patient with a partial anterior nonfusion, or ventral cleft, of the thyroid cartilage. This was first noted on computed tomography of the larynx used for delineation of carcinoma and was confirmed by horizontal whole mount histologic sections of the resected larynx. The thyroid cartilage suggested arrested fusion of the laminae in the middle to late embryonic period. This patient had an adult form of this rarely reported anomaly and the first, to our knowledge, detected with CT scan.

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