Etching of the Test Surface of Benthonic Foraminifers due to Ingestion by the Gastropod Littorina littorea Linné

1971 ◽  
Vol 8 (11) ◽  
pp. 1487-1491 ◽  
Author(s):  
D. A. Walker
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Littorina Littorea ◽  
Test Surface ◽  
Partial Dissolution ◽  
The Common ◽  
Wall Construction ◽  
Acidic Nature ◽  
Scanning Electron

Investigations by scanning electron microscopy have revealed that ingestion of Rosalina floridana (Cushman) and Quinqueloculina seminulum (Linné) (Foraminiferida) by the common periwinkle Littorina littorea Linné results in severe etching of the surface veneer in the rotalids studied, and removal of the surface veneer and partial dissolution of the underlying tabular layer of calcite in the miliolids examined. The acidic nature of the digestive juices is suggested as the agent responsible for this phenomenon. Observations of test wall construction is compared to current models of calcite secretion.

The ultrastructure of the molluscum contagiosum lesion

1990 ◽  
Vol 48 (3) ◽  
pp. 218-219
Author(s):  
Veronika Burmeister ◽  
W.B. Shelley
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Skin Lesions ◽  
Molluscum Contagiosum ◽  
Epidermal Keratinocytes ◽  
Razor Blade ◽  
Tumor Mass ◽  
Common Wart ◽  
The Common ◽  
Scanning Electron

Molluscum contagiosum is unique among the viral induced growths of the skin. Unlike other viral tumors, the molluscum contagiosum lesion is a mass made up of myriads of free, discrete virions. It is not a proliferating growth of epidermal keratinocytes such as one observes in the common wart. There is no better way to perceive the nature of this tumor mass than by scanning electron microscopy.Skin lesions of molluscum contagiosum were excised from patients and immediately fixed in 2.5% glutaraldehyde. After fixation the specimens were rinsed in Millonig’s Phosphate buffer. The entire lesion was than cross-sectioned with a razor blade, postfixed in 1% OsO4, rinsed again in buffer, dehydrated in grading ETOH, critical point dried, positioned on an aluminum stub and gold-coated. Examination was made using a JEOL SEM (JSM-35).

Floral development in Daviesia cordata (Leguminosae: Papilionoideae: Mirbelieae) and its systematic implications

2004 ◽  
Vol 52 (3) ◽  
pp. 285 ◽  
Author(s):  
G. Prenner
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Floral Development ◽  
First Record ◽  
Data Matrix ◽  
Developmental Studies ◽  
Adaxial Side ◽  
Abaxial Side ◽  
The Common ◽  
Scanning Electron

The floral development of Daviesia cordata Smith is studied by the use of scanning electron microscopy. This is the first study of a member of Mirbelieae. Although organ initiation in Papilionoideae is said to be almost uniformly unidirectional from the abaxial to the adaxial side, the presented floral development shows striking differences from this mode. Sepals, petals and the antepetalous stamens are initiated in simultaneous whorls, which is seen as a consequence of harmonisation of the plastochrons within the whorls. The antesepalous stamens are initiated unidirectional from the adaxial to the abaxial side, which is the reversed direction of the common mode of Papilionoideae. This is the first record of reversed unidirectionality in Papilionoideae, which can be linked with isolated findings in Caesalpinioideae and Mimosoideae. Concerning developmental aspects, the results seem to link the papilionoid flower closer to those of Caesalpinioideae and Mimosoideae. Further developmental studies are necessary to broaden the data matrix for a detailed phylogenetic analysis.

Adrenal Microvascularization in the Common Tree Shrew (Tupaia glis) as Revealed by Scanning Electron Microscopy of Vascular Corrosion Casts

1998 ◽  
Vol 163 (1) ◽  
pp. 31-38 ◽  
Author(s):  
S. Thongpila ◽  
S. Rojananeungnit ◽  
P. Chunhabundit ◽  
C. Cherdchu ◽  
A. Samritthong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tree Shrew ◽  
Corrosion Casts ◽  
Tupaia Glis ◽  
The Common ◽  
Common Tree ◽  
Scanning Electron ◽  
Vascular Corrosion Casts
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