scholarly journals Test Surface Ultrastructure of Benthonic Foraminifera and Applications of Scanning Electron Microscopy

1974 ◽  
Author(s):  
D A Walker
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Test Surface ◽  
Surface Ultrastructure ◽  
Scanning Electron

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.

scholarly journals The species of Grammostola (Araneae: Theraphosidae) from Central Argentina: taxonomy, distribution, and surface ultrastructure of coxal setae

Zootaxa ◽  
2011 ◽  
Vol 2828 (1) ◽  
pp. 1 ◽  
Author(s):  
N. FERRETTI ◽  
G. POMPOZZI ◽  
F. PÉREZ-MILES
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Portion ◽  
Surface Ultrastructure ◽  
Central Argentina ◽  
Difficult Genus ◽  
Different Types ◽  
Basal Portion ◽  
New Synonymy ◽  
Scanning Electron

Three species of Grammostola (Araneae, Mygalomorphae, Theraphosidae) from central Argentina are redescribed and illustrated and their geographic distributions are reported. A new synonymy between G. vachoni Schiapelli & Gerschman 1961 and G. schulzei (Schmidt 1994) n. syn. is proposed. We did not find zones of co-occurrence with the three species but, in several localities, we found two Grammostola species in sympatry. The surface ultrastructure of three types of coxal setae was studied by scanning electron microscopy (SEM). Two morphological types of spiniform setae were found on the coxae. The first type consisted of short and strong piriform setae, with the surface completely covered by ridges, and the second type consisted of long and thinner spiniform setae, with a piriform basal portion. The basal portion of the setae had ridges, the central portion was smooth and the apical zone had numerous short barbs with curved tips. The different types of setae found in these Grammostola species are clearly distinguished, and could be new useful character to diagnose at least these species. In combination with other characteristics, these characters could probably help to solve the problems in other species of this difficult genus if not also other genera.

Ultrastructural observations on the surface of Thelazia lacrymalis (Nematoda: Spirurida, Thelaziidae)

2005 ◽  
Vol 53 (2) ◽  
pp. 205-212 ◽  
Author(s):  
Soraya Naem
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Buccal Capsule ◽  
Ventral Side ◽  
Infected Cattle ◽  
Surface Ultrastructure ◽  
Small Papilla ◽  
Scanning Electron

Scanning electron microscopy (SEM) was used to study the surface ultrastructure of female Thelazia lacrymalis obtained from naturally infected cattle. At the anterior end, the buccal capsule was cup shaped. The mouth was without lips and was surrounded by four cephalic papillae and two amphids. There were two lateral cervical papillae. Also, a single small papilla was seen on the ventral side, close to the vulvar opening. The vulva was located posterior to the end of the oesophagus and the tail carried an anal pore and a pair of phasmids near the tip. The cuticle was transversally annulated with fine striations.

Portulaca oleracea aggregate (Portulacaceae) from the Chernivtsi Region (Ukraine)

2020 ◽  
Vol 12 (2) ◽  
pp. 251-262
Author(s):  
Olena Bulakh ◽  
Olena Volutsa ◽  
Alla Tokaryuk ◽  
Vasyl Budzhak ◽  
Ksenia Korzhan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Smooth Surface ◽  
Seed Morphology ◽  
Portulaca Oleracea ◽  
Scanning Microscope ◽  
Surface Ultrastructure ◽  
Seed Surface ◽  
Scanning Electron ◽  
Brown Color

At the results of investigation of micromorphology features of seed surface of the Portulaca oleracea aggr. (Portulacaceae Juss.) from Chernivtsi Region (Ukraine) six morphotypes of this taxa were recorded. Some peculiarities of the seed morphology of Portulaca L., and features of the ultrastructure of seed surface of the P. oleracea aggr. morphotypes, based on the results of micromorphological studies with using electronic scanning microscope was described. The general for the representative of the genus (e.g. globous, ovate or almost reniform shaped of seeds; black or dark brown color) and specify for the morphological types (star-shaped, isodiametric or elongate cells of seed surface with central part and long or short rays; smooth surface of seed or with knobs (from 0,03 mm in diameter) or papillae (0,01–0,02 mm), etc.) peculiarities are determined. The original scanning electron microscopy (SEM) photographs of seed surface ultrastructure of the studied morphological types and key fragment for its determination are suggested. According to our investigation six morphotypes of Portulaca oleracea aggr. are presented in Chernivtsi Region. Some of them are new for studied territory (P. granulatostellulata (Poelln.) Ricceri & Arrigoni, P. papillatostellulata (Danin & H.G. Baker) Danin), and other (Portulaca nitida (Danin & H.G. Baker) Ricceri & Arrigoni, P. trituberculata Danin, Domina & Raimondo, P. tuberculata (Danin & H.G. Baker) Danin) – new floristic records for Ukraine, and one of them (P. oleracea) – was known before also. The maps of distribution of this morphotypes in the region are presented. At the results of morphotypes distribution the most common is P. granulatostellulata and P. oleracea – rare in studied region like as in Europe also.

Atomic Force Microscopy and Scanning Electron Microscopy Reveal Genome–dependent Ultrastructure of Seed Surface

2001 ◽  
Vol 7 (6) ◽  
pp. 526-529
Author(s):  
T. Guha ◽  
R. Bhar ◽  
V. Ganesan ◽  
A. Sen ◽  
R.L. Brahmachary
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Contact Mode ◽  
Surface Ultrastructure ◽  
Force Microscopy ◽  
Seed Surface ◽  
Atomic Force ◽  
Different Strains ◽  
Scanning Electron

AbstractBoth scanning electron microscopy (SEM) and contact mode imaging via atomic force microscopy (AFM) have been utilized to elucidate the ultrastructure of mung bean seed surfaces. The results indicate: 1) that AFM is useful in the examination of seed surface ultrastructure ex-vaccuo without the need for additional complex preparative procedures; and 2) that both the cotyledon and seed coat of different strains of mung beans bear specific ultrastructural details unique to each strain. To our knowledge, these are the first AFM images of seed surfaces.

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