Gomphonema grande sp. nov., a new diatom (Bacillariophyta) from the Democratic Republic of the Congo, Tropical Africa

Phytotaxa ◽  
2016 ◽  
Vol 245 (3) ◽  
pp. 187 ◽  
Author(s):  
Balasubramanian Karthick ◽  
Patrick John Kociolek ◽  
Jonathan C Taylor ◽  
Christine Cocquyt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Democratic Republic ◽  
Tropical Africa ◽  
Congo River ◽  
Large Size ◽  
Congo River Basin ◽  
Republic Of The Congo ◽  
Unique Shape ◽  
Scanning Electron

Gomphonema grande sp. nov. is described from a single sample collected from the Congo River Basin, Tropical Africa. The morphological features of the new species are described and documented through light microscopy and scanning electron microscopy analyses. Gomphonema grande differs from most species of the genus by its relatively large size, robust valves, unique shape, and distinctive suite of valve features such as a labium-shaped internal stigma opening. Further discussion on the diverse nature of certain characters in the genus Gomphonema is presented.

Description of two new Geissleria species (Bacillariophyta) from Central and West tropical Africa

Phytotaxa ◽  
2019 ◽  
Vol 402 (5) ◽  
pp. 241 ◽  
Author(s):  
CHRISTINE COCQUYT ◽  
EDIT LOKELE NDJOMBO
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Biosphere Reserve ◽  
Tropical Africa ◽  
Dr Congo ◽  
Congo River ◽  
West Tropical Africa ◽  
Scanning Electron ◽  
Small Tributary

During a recently started-up project in the Biosphere Reserve at Yangambi, DR Congo, an unknown Geissleria taxon was observed in a small tributary of the Congo River. This taxon is here described as new to science based on detailed light and scanning electron microscopy observations. Geissleria lubiluensis sp. nov. can be distinguished by the slightly tri-undulate valve margins and the very distinct annulus located at a distance of 3 striae from the apex. The comparison of this taxon with various other Geissleria taxa with resembling valve outline or with resembling annulus structure, led to the description of another new species: Geissleria fogedii sp. nov. reported by Foged from Ghana as Navicula paludosa. This taxon resembles very well Geissleria lubiluensis but differs in the distinct annulus located closer to the apex mostly at the distance of one stria, the broader valves and the denser striation.

Taxonomic application of macro and micro morphological characters of seeds in Astragalus L. (Galegeae, Fabaceae) in India

Phytotaxa ◽  
2021 ◽  
Vol 502 (2) ◽  
pp. 191-207
Author(s):  
SHIVANI KASHYAP ◽  
CHANDAN KUMAR SAHU ◽  
ROHIT KUMAR VERMA ◽  
LAL BABU CHAUDHARY
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Seed Coat ◽  
Morphological Plasticity ◽  
Morphological Characters ◽  
Individual Species ◽  
Large Size ◽  
The Individual ◽  
Scanning Electron

Due to large size and enormous morphological plasticity, the taxonomy of the genus Astragalus is very complex and challenging. The identification and grouping of species chiefly based on macromorphological characters become sometimes difficult in the genus. In the present study, the micromorphology of the seeds of 30 species belonging to 14 sections of Astragalus from India has been examined applying scanning electron microscopy (SEM) along with light microscopy (LM) to evaluate their role in identification and classification. Attention was paid to colour, shape, size and surface of seeds. The overall size of the seeds ranges from 1.5–3.2 × 0.8–2.2 mm. The shape of the seeds is cordiform, deltoid, mitiform, orbicular, ovoid and reniform. The colour of seeds varies from brown to blackish-brown to black. Papillose, reticulate, ribbed, rugulate and stellate patterns were observed on the seed coat surface (spermoderm) among different species. The study reveals that the seed coat ornamentations have evolved differently among species and do not support the subgeneric and sectional divisions of the genus. However, they add an additional feature to the individual species, which may help in identification in combination with other macro-morphological features.

Pinworms (Nematoda: Thelastomatoidea) from Insects Collected in Mississippi, USA, with description of a new species of Protrellus Cobb, 1920 from the Cockroach Ischnoptera deropeltiformis Brunner von Wattenwyl, 1865 (Blattaria: Ectobiidae)

Zootaxa ◽  
2018 ◽  
Vol 4531 (4) ◽  
pp. 567
Author(s):  
RAMON A. CARRENO
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
New Host ◽  
Large Size ◽  
Opposite Pole ◽  
A New Species ◽  
Scanning Electron

Thelastomatoid nematodes from the hindguts of several species of insects were collected in 4 localities in Mississippi, U.S.A. Protrellus browni n. sp. is described from Ischnoptera deropeltiformis (Blattaria: Ectobiidae) using light and scanning electron microscopy. This species is distinguished on the basis of its large size as well as its large eggs having one broad end tapering toward the opposite pole and with the presence of small spines on part of the shell. Protrellus aurifluus (Chitwood, 1932) Basir, 1956 was found in Parcoblatta fulvescens (Blattaria: Ectobiidae). Four other species of blattarians sampled were negative for pinworms. Additional nematodes recovered from other hosts included Zonothrix columbianus Adamson & Buck 1989 (Thelastomatoidea: Pseudonymidae) from Tropisternus blatchleyi blatchleyi and Tropisternus collaris (Coleoptera: Hydrophilidae), Hystrignathus rigidus Leidy, 1850 and Xyo pseudohystrix Travassos & Kloss, 1958 (Thelastomatoidea: Hystrignathidae) from Odontotaenius disjunctus (Coleoptera: Passalidae). These findings include several new host and geographical records. 

scholarly journals Variation in seed morphology in the genus Erica L. (Ericaceae)

2009 ◽  
Vol 16 (1) ◽  
pp. 1-106 ◽  
Author(s):  
Piotr Szkudlarz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cape Floristic Region ◽  
Seed Morphology ◽  
Key To Species ◽  
Tropical Africa ◽  
Seed Shape ◽  
Diagnostic Features ◽  
Seed Characteristics ◽  
Scanning Electron

Variation in seed morphology in the genusEricaL. (Ericaceae)Seed morphology was studied in 136 species ofErica, including 123 from South Africa (Cape Floristic Region), 5 from tropical Africa, and 8 from Europe. Seed anatomy was studied in 13 selected species by light and scanning electron microscopy. Seed morphology of each species was described and documented by SEM micrographs. Ten major diagnostic features were selected, concerning seed shape, primary sculpture, and fine relief. On the basis of these features, the species were divided into 14 groups. Within them, 40 morphologically homogeneous subgroups were distinguished, which could possibly be used in future revisions of the genus. A key to species identification has been developed on the basis of seed characteristics. A very close similarity was observed between seeds of someEricaspecies from distant parts of the distribution range of this genus.

Nothacrobeles borregi n. sp. (Nematoda: Cephalobidae) from Anza Borrego, California and N. laticollaris (De Ley & Vandebroek, 1992) n. comb.

Nematology ◽  
2002 ◽  
Vol 4 (7) ◽  
pp. 865-874
Author(s):  
James Baldwin ◽  
Larisa Poiras ◽  
Daniel Bumbarger ◽  
Manuel Mundo-Ocampo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Larrea Tridentata ◽  
Creosote Bush ◽  
Generic Level ◽  
Large Size ◽  
Specific Morphology ◽  
Insight Into ◽  
Scanning Electron

AbstractNothacrobeles borregi n. sp. is described from blow-sand in the vicinity of the roots of creosote bush (Larrea tridentata) from Anza Borrego State Park, San Diego, California. The new species is distinctive from all others of the genus by the specific morphology of the labial probolae and lips, as viewed with both interference light and scanning electron microscopy. The probolae include a basal ridge unique by its large size, smooth rim (lacking tines), and unusual large triangular platelet projections on each side; the probolae are also distinctive in having a knob-like ledge separate and posterior to the basal ridge. Nothacrobeles borregi n. sp. provides a new insight into homology of characters important for addressing problems with generic level classification in Cephalobinae. These hypotheses of homology suggest a basis for transferring N. laticollaris n. comb. (syn. Cervidellus laticollaris). Characteristics of Nothacrobeles in relation to Cervidellus and Stegelletina are discussed.

Adlafia moseri and A. tjibaoui two new diatom species (Bacillariophyta) from New Caledonia with further observations on Adlafia muscora and Kobayasiella saxicola

Phytotaxa ◽  
2018 ◽  
Vol 357 (1) ◽  
pp. 41 ◽  
Author(s):  
JULIEN MARQUIE ◽  
RENE LE COHU ◽  
MICHEL COSTE
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
New Caledonia ◽  
Running Waters ◽  
Diatom Species ◽  
Large Size ◽  
Emended Description ◽  
Very High ◽  
Scanning Electron

During a recent survey of epilithic diatoms in running waters of New Caledonia, two unknown Adlafia Moser, Lange-Bertalot & Metzeltin species were found. Both species are described as new based on light and scanning electron microscopy (LM and SEM). Adlafia moseri sp. nov., is characterised by its margins morphology, its large size and its low stria density, clearly visible in LM. Adlafia tjibaoui sp. nov. shows a very long internal intermissio with curved proximal raphe endings and a very high stria density. Since the generitype Adlafia muscora (Kociolek & de Reviers) Moser, Lange-Bertalot & Metzeltin was poorly described, its diagnosis is emended based on more detailed scanning electron microscopy observations. Kobayasiella saxicola (Manguin) Lange-Bertalot, only described in light microscopy, occurs frequently in some running waters in New Caledonia. An emended description of this taxon is likewise proposed based on additional SEM data.

scholarly journals Immobilization of Detonation Nanodiamonds on Macroscopic Surfaces

2019 ◽  
Vol 9 (6) ◽  
pp. 1064 ◽  
Author(s):  
Sascha Balakin ◽  
Nicholas R. Dennison ◽  
Benjamin Klemmed ◽  
Juliane Spohn ◽  
Gianaurelio Cuniberti ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Functionalization ◽  
Biomedical Applications ◽  
Fluorescent Microscopy ◽  
Detonation Nanodiamonds ◽  
Large Size ◽  
Sem Imaging ◽  
Carbon Based Nanomaterials ◽  
Scanning Electron

Detonation nanodiamonds (NDs) are a novel class of carbon-based nanomaterials, and have received a great deal of attention in biomedical applications, due to their high biocompatibility, facile surface functionalization, and commercialized synthetic fabrication. We were able to transfer the NDs from large-size agglomerate suspensions to homogenous coatings. ND suspensions have been used in various techniques to coat on commercially available substrates of pure Ti and Si. Scanning electron microscopy (SEM) imaging and nanoindentation show that the densest and strongest coating of NDs was generated when using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide (EDC/NHS)-mediated coupling to macroscopic silanized surfaces. In the next step, the feasibility of DNA-mediated coupling of NDs on macroscopic surfaces is discussed using fluorescent microscopy and additional particle size distribution, as well as zeta potential measurements. This work compares different ND coating strategies and describes the straightforward technique of grafting single-stranded DNA onto carboxylated NDs via thioester bridges.

scholarly journals Pollen morphology of the native Rutaceae species from Argentina

2021 ◽  
Vol 9 (2) ◽  
pp. 282-292
Author(s):  
Silvina S. Garralla ◽  
Lilia R. Mautino
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Morphological Characteristics ◽  
Morphological Characters ◽  
Pollen Grain ◽  
Large Size ◽  
Scanning Electron ◽  
Shape And Size

The pollen morphology of 13 native taxa of the Rutaceae from Argentina was studied under optical and scanning electron microscopy to provide new data that would allow delimiting these taxa. The species considered were Balfourodendron riedelianum, Esenbeckia densiflora, E. febrifuga, E grandiflora, Helietta apiculata, Pilocarpus pennatifolius, Zanthoxylum caribaeum, Z. coco, Z. fagara, Z. petiolare, Z. rhoifolium, Z. riedelianum and Zanthoxylum rigidum ssp. hasslerianum. The general morphological characteristics of the pollen grain of these species are: radiosymmetric, isopolar; small, medium or large size; 3-colporate or 4-colporate; colpus with costa colpi; semitectate (reticulate, striate reticulate or striate). Sculpture, shape and size are the main characters that allow differentiating the studied taxa. Morphological characters among the species are discussed and a species key is presented.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

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