Fine structure of the retina of the giant scallop, Placopecten magellanicus

1984 ◽  
Vol 42 ◽  
pp. 312-313
Author(s):  
C.V.L. Powell
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Light Intensity ◽  
Scanning Electron Microscope ◽  
Eye Development ◽  
Preliminary Observation ◽  
Columnar Epithelium ◽  
Placopecten Magellanicus ◽  
Environmental Light ◽  
Scanning Electron

The overall fine structure of the eye in Placopecten is similar to that of other scallops. The optic tentacle consists of an outer columnar epithelium which is modified into a pigmented iris and a cornea (Fig. 1). This capsule encloses the cellular lens, retina, reflecting argentea and the pigmented tapetum. The retina is divided into two parts (Fig. 2). The distal retina functions in the detection of movement and the proximal retina monitors environmental light intensity. The purpose of the present study is to describe the ultrastructure of the retina as a preliminary observation on eye development. This is also the first known presentation of scanning electron microscope studies of the eye of the scallop.

The distribution and fine structure of the integumentary papillae of the cercaria ofHimasthla secunda(Nicoll)

Parasitology ◽  
1970 ◽  
Vol 61 (2) ◽  
pp. 219-227 ◽  
Author(s):  
H. D. Chapman ◽  
R. A. Wilson
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Spatial Distribution ◽  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silver Nitrate ◽  
Light Microscope ◽  
Transmission Electron ◽  
Scanning Electron

The distribution of the integumentary papillae of the cercaria ofHimasthla secundahas been studied by a variety of techniques. Structures stained by silver nitrate and visible under the light microscope correspond in their spatial distribution with papillae observed under the scanning electron microscope. The tegumentary papillae described with the light and scanning electron microscope are correlated with the specialized nerve endings in the tegument as seen in transmission electron microscopy. The ultrastructure of these papillae is examined by conventional transmission electron microscopy and the probability that these structures are sensory is discussed.

scholarly journals Scanning electron microscope studies of Avena coleoptiles during primary leaf emergence

2014 ◽  
Vol 57 (4) ◽  
pp. 431-445 ◽  
Author(s):  
Norman R. Dollahon ◽  
Andrew B. Maksymowych ◽  
Maria Galanti ◽  
Joseph A. Orkwiszewski
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Vascular Tissue ◽  
Guard Cells ◽  
Primary Leaf ◽  
Scanning Electron Microscope Study ◽  
Leaf Emergence ◽  
The Relationship ◽  
Scanning Electron

A scanning electron microscope study of the fine structure of coleoptiles of <em>Avena sativa</em> L. cv. Clintford has revealed information about the relationship between aspects of coleoptilar structure and the emergence of the primary leaf. Stomata are located on the lateral sides of the coleoptile and arch across the apex. The location of the stomata and associated vascular tissue may play a role in the splitting of the coleoptile pore and influence the manner in which the primary leaf emerges. Details of the surface fine structure of the coleoptile pore, its associated cells, stomata and guard cells are presented.

Considerations in Making Stereo Micrographs With the Scanning Electron Microscope

1973 ◽  
Vol 31 ◽  
pp. 234-235
Author(s):  
E. R. Walter
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Three Dimensional ◽  
Spatial Relationships ◽  
Additional Information ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron

The information obtainable with the scanning electron microscope can often be increased severalfold through the use of stereomicrograph pairs. Not only is the detail which can be observed the equivalent of a 2X increase in magnification over that apparent in a single micrograph, but, threedimensional spatial relationships are more accurately preserved. This is especially true where protruding or pyramided fine structure and/or gross reentrance exists. Since stereo micrographs are conveniently obtained with most scanning electron microscopes, it is generally desirable to add the additional information they offer whenever the three-dimensional relationships present in the specimen'are not readily apparent.

Scanning electron microscopy of the fourth antennular segment of Balanus amphitrite amphitrite

1994 ◽  
Vol 74 (4) ◽  
pp. 967-970
Author(s):  
A.S. Clare ◽  
J.A. Nott
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Balanus Amphitrite ◽  
Scanning Electron

Despite extensive studies on settlement of the cypris larva of Balanus amphitrite amphitrite Darwin (Crustacea: Cirripedia), the fine structure of the putative settlement receptors of this species has not been described. This study presents observations made with the scanning electron microscope of the fourth antennular segment and its associated setae.

scholarly journals The Diagnostic Potential of Primary Remex Microstructure in Rare Species of Falcons (Falconidae)

2017 ◽  
Vol 12 (3) ◽  
pp. 97-104 ◽  
Author(s):  
E. O. Fadeeva ◽  
V. G. Babenko
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Rare Species ◽  
Microstructural Characteristics ◽  
Forensic Biology ◽  
Falco Rusticolus ◽  
Diagnostic Potential ◽  
Species Specific ◽  
Scanning Electron

The paper reports on the original findings of scanning electron microscope comparison of the fine structure of primary remiges inFalco rusticolus, F. cherrug, F. peregrinus, and F. rusticolus х F. cherrug. The study identified a number of species-specific microstructural characteristics that show a high diagnostic potential for taxonomic identifications in forensic biology.

A Scanning Electron Microscope Study of the Frustule Structure of the Freshwater Diatom Melosira Granulata (Ehr.) Ralfs

1973 ◽  
Vol 31 ◽  
pp. 218-219
Author(s):  
W. H. Abbott ◽  
C. O. Pollard
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Microscope Study ◽  
Light Microscope ◽  
Electron Microscope Study ◽  
Scanning Electron Microscope Study ◽  
Scanning Electron ◽  
Conventional Light Microscope ◽  
Freshwater Diatom

Frustules of the freshwater diatom Melosira granulata (Ehr.) Ralfs from a freshwater diatomite of Miocene age and recent frustules of this species from Reelfoot Lake, Tennessee were examined under a scanning electron microscope to determine fine structure generally not seen or poorly seen with the conventional light microscope.The terminology used to describe frustule structure in this study was originated by Hendy.Melosira granulata generally grows in chains of two connected frustules with each frustule containing two valves or halves. The connection between frustules is accomplished by the encasing of the adjacent valves of two frustules by a structure called the girdle (Fig. 1a).

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