Arhabdomeric cells of the median eye retina of scorpions

1979 ◽  
Vol 130 (3) ◽  
pp. 265-270 ◽  
Author(s):  
Manfred Schliwa ◽  
G�nther Fleissner
Keyword(s):  
Arhabdomeric Cells ◽  
Eye Retina

Research on registration algorithm based on feature points for human eye retina images

2009 ◽  
Author(s):  
Yuran Liu ◽  
Huizhen Yang ◽  
Liyun Su ◽  
Yudong Zhang ◽  
Xuejun Rao
Keyword(s):  
Feature Points ◽  
Human Eye ◽  
Registration Algorithm ◽  
Eye Retina ◽  
Retina Images

Acute Bilateral Blindness in the Setting of Sudden Onset of Bilateral Proptosis and Ophthalmoplegia: A Case Report With Literature Review

2021 ◽  
pp. 10.1212/CPJ.0000000000001090
Author(s):  
sara zarei ◽  
Phuong Vo ◽  
Christian Sam ◽  
Robert W Crow ◽  
Charles Stout ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Visual Pathway ◽  
Rapid Onset ◽  
Sudden Onset ◽  
Acute Onset ◽  
Posterior Chamber ◽  
Ischemic Optic Neuropathy ◽  
Radiographic Findings ◽  
Underlying Pathophysiology ◽  
Eye Retina

ABSTRACTPurposeof review: Acute bilateral blindness has an extensive differential diagnosis that requires a careful history and physical exam to narrow down. In this paper we discuss the pathophysiology and radiographic findings of each possible diagnosis for acute bilateral blindness.Recent findings:Visual pathology with respect to bilateral blindness can be broadly broken down into three anatomic categories: media (i.e. the anterior and posterior chamber of the eye), retina, and neural visual pathway. Possible causes of rapid onset bilateral blindness include bilateral occipital infarcts, endogenous bacterial endophthalmitis, orbital cellulitis, orbital compartment syndrome, cavernous sinus thrombophlebitis, thyroid disease and bilateral non-arteritic ischemic optic neuropathy.Summary:In this case we present a patient with acute onset of bilateral blindness, in addition to bilateral ophthalmoplegia, proptosis, and orbital chemosis. We believe this rare case of acute bilateral blindness is thought provoking and aids in the understanding of the differential diagnosis and underlying pathophysiology of visual loss.

Setting up the Attribute Space of Periodic Time Dependencies for Dynamic Object Diagnostic Systems (Taking the Eye Retina as an Example)

Vestnik MEI ◽  
2021 ◽  
pp. 100-107
Author(s):  
Yuliya S. Aleksandrova ◽  
◽  
Dmitriy A. Balarev ◽  
Oleg S. Kolosov ◽  
Anna V. Ovivyan ◽  
...  
Keyword(s):  
Polynomial Approximation ◽  
Pulse Frequency ◽  
Dynamic Object ◽  
Diagnostic Systems ◽  
Experimental Conditions ◽  
Frequency Responses ◽  
Study Results ◽  
Time Dependencies ◽  
Attribute Space ◽  
Eye Retina

The technology of testing dynamically and structurally similar aircraft models for flutter in subsonic wind tunnels using information and The article addresses techniques for setting up the attribute space of informative features of periodic signals recorded at the output of a dynamic object with an unknown structure in response to rectangular testing signals of different frequencies applied to the object input. The attribute space is used in developing expert systems for diagnosing the current state of an operating dynamic object. With a great variety of possible developing faults, the simplest practical techniques involving the use of characteristic points of change in the observed time dependencies yield a limited number of features with large mutual intersection domains. To expand the attribute space, it is proposed to use the expansion of input and output signals into a Fourier series for setting up a base of additional features. The proposed features characterize, depending on the testing conditions, the object’s transferring properties in the frequency domain from changes in its amplitude and phase characteristics. The test pulse frequency and duration serve as such conditions. For the convenience of comparing the object’s frequency responses variation pattern, two special procedures are used. The first procedure allows the observed time dependencies to be reduced to a single pseudo frequency of the test signals. The second procedure uses specially formed windows for subjecting individual fragments of the observed time dependencies to a spectral analysis. It is shown that, depending on the type of the frequency responses being analyzed, the techniques for their polynomial approximation, as well as integral estimates of frequency response individual domains can be useful. The polynomial approximation makes it possible to use the coefficients of the approximating polynomials as additional features, and the integration of individual characteristic domains of the frequency responses makes it possible to introduce dimensionless relative indicators that characterize the degree of change in the frequency responses depending on the experimental conditions. The considered techniques open the possibility to select additional features that can help distinguish both separate groups of faults and individual faults in operating objects. The study results are illustrated by the examples of analyzing the changes in electroretinograms that record changes in the eye retina biopotential in response to light flashes of different frequencies.

Arhabdomeric cells in the retina of the median eyes of the scorpion

1978 ◽  
Vol 65 (4) ◽  
pp. 210-211 ◽  
Author(s):  
G. Fleissner ◽  
W. Siegler
Keyword(s):  
Arhabdomeric Cells ◽  
Median Eyes

The zebrafish homologs of SET/I2PP2A oncoprotein: expression patterns and insights into their physiological roles during development

2016 ◽  
Vol 473 (24) ◽  
pp. 4609-4627 ◽  
Author(s):  
Iliana Serifi ◽  
Eleni Tzima ◽  
Katerina Soupsana ◽  
Zoe Karetsou ◽  
Dimitris Beis ◽  
...  
Keyword(s):  
Amino Acids ◽  
Lateral Line ◽  
Gene Networks ◽  
Expression Patterns ◽  
Otic Vesicle ◽  
Lateral Line System ◽  
Loss Of Function ◽  
Line System ◽  
Eye Retina

The oncoprotein SET/I2PP2A (protein phosphatase 2A inhibitor 2) participates in various cellular mechanisms such as transcription, cell cycle regulation and cell migration. SET is also an inhibitor of the serine/threonine phosphatase PP2A, which is involved in the regulation of cell homeostasis. In zebrafish, there are two paralogous set genes that encode Seta (269 amino acids) and Setb (275 amino acids) proteins which share 94% identity. We show here that seta and setb are similarly expressed in the eye, the otic vesicle, the brain and the lateral line system, as indicated by in situ hybridization labeling. Whole-mount immunofluorescence analysis revealed the expression of Seta/b proteins in the eye retina, the olfactory pit and the lateral line neuromasts. Loss-of-function studies using antisense morpholino oligonucleotides targeting both seta and setb genes (MOab) resulted in increased apoptosis, reduced cell proliferation and morphological defects. The morphant phenotypes were partially rescued when MOab was co-injected with human SET mRNA. Knockdown of setb with a transcription-blocking morpholino oligonucleotide (MOb) resulted in phenotypic defects comparable with those induced by setb gRNA (guide RNA)/Cas9 [CRISPR (clustered regularly interspaced short palindromic repeats)-associated 9] injections. In vivo labeling of hair cells showed a significantly decreased number of neuromasts in MOab-, MOb- and gRNA/Cas9-injected embryos. Microarray analysis of MOab morphant transcriptome revealed differential expression in gene networks controlling transcription in the sensory organs, including the eye retina, the ear and the lateral line. Collectively, our results suggest that seta and setb are required during embryogenesis and play roles in the zebrafish sensory system development.

Comparative Studies on the Histology of Eye Retina in Some Nile Fishes with Different Dial Activities

2017 ◽  
Vol 68 (1) ◽  
pp. 815-823
Author(s):  
Ahmad M. Azab ◽  
Hoda M. Shoman ◽  
Ragaa M. El-Deeb
Keyword(s):  
Comparative Studies ◽  
Eye Retina

scholarly journals THE CHOICE AND SUBSTANTIATION OF THE MATHEMATICAL MODEL OF ELECTRORETINOGRAM IN THE FORM OF LINEAR STOCHASTIC PROCESS

2014 ◽  
pp. 95-99
Author(s):  
S. V. Dzubin ◽  
A. V. Matsiuk ◽  
S. V. Martsenko ◽  
M. V. Pryimak
Keyword(s):  
Mathematical Model ◽  
Stochastic Process ◽  
Random Process ◽  
Applied Research ◽  
The Mathematical Model ◽  
Eye Retina

The mathematical model of electroretinogram as a linear random process which takes into account the mechanism of eye retina biopotentials forming and is suitable for solving of the measuring and diagnosing problems is developed in the work. The approach is proposed, the method is developed and the statistics are given to estimate the kernel of the linear random process as electroretinogram model. The obtained results may be used in the applied research of eye diagnosis.

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