The ultrastructure of the major species of an enriched methanogenic culture utilizing acetic acid

1979 ◽  
Vol 25 (7) ◽  
pp. 826-832 ◽  
Author(s):  
J. Ross Colvin ◽  
L. C. Sowden ◽  
L. van den Berg
Keyword(s):  
Acetic Acid ◽  
New Species ◽  
Variable Thickness ◽  
Cell Walls ◽  
Cytoplasmic Membrane ◽  
Lead Ions ◽  
Outer Leaflet ◽  
Major Species ◽  
Thin Portion ◽  
A New Species

The ultrastructure of the cells of the major component of an enriched culture of a presumed methanogen which utilized acetic acid was studied by transmission and scanning election microscopy. The filaments were composed of Gram-positive, rod-shaped cells, 1–2 μm in length and about 0.5 μm in breadth, attached end to end. Septa between cells were complex, with a central, electron-dense sheet which had a spherical enlargement in the center separating the cell walls. The cells walls themselves were of variable thickness with a light, fluffy, thin portion on the outside and a denser, thicker portion within. They contain a series of rings stacked side by side which are composed of material that stains strongly and positively with phosphotungstate ion. The cytoplasmic membrane of these cells had an outer leaflet which stains more densely with uranium and lead ions than the inner leaflet. There were no recognizable organelles in the cytoplasm other than ribosomes. It is shown in these observations that the presumed methanogen may likely be a new species.

Gymnomitrion fissum (Gymnomitriaceae, Marchantiophyta) — a new species with fissured leaf surface from China

2017 ◽  
Vol 51 ◽  
pp. 274-280
Author(s):  
A. D. Potemkin ◽  
Yu. S. Mamontov ◽  
N. S. Gamova
Keyword(s):  
New Species ◽  
Cross Sections ◽  
Cell Walls ◽  
Leaf Surface ◽  
Outer Cell ◽  
Sem Images ◽  
Cell Lumen ◽  
A New Species ◽  
Surface Comparison

Study of selected specimens of Gymnomitrion collected by D. G. Long in Yunnan, China, revealed a new species, G. fissum Mamontov et Potemkin, sp. nov., with a fissured leaf surface. Comparison of SEM images of the leaf surface and leaf cross sections shows that the leaf surface of G. fissum is different from that of other known species with a superficially similar leaf surface, i. e. Mylia taylorii, M. verrucosa s. l. and Trabacellula tumidula. It has fissures around the cell lumen rather than grids and perforations. Outer cell walls of Gymnomitrion fissum are much thicker than in Mylia taylorii, M. verrucosa s. l. and Trabacellula tumidula, and their outer layers tend to be partly or completely caducous. G. fissum is related to the group of species assigned to the former genus Apomarsupella.

A new species and comparative morphology of Vesselowskya (Cunoniaceae)

2001 ◽  
Vol 14 (2) ◽  
pp. 175 ◽  
Author(s):  
Andrew C. Rozefelds ◽  
Richard W. Barnes ◽  
Belinda Pellow
Keyword(s):  
New Species ◽  
Cell Walls ◽  
New South ◽  
Comparative Morphology ◽  
Epidermal Cells ◽  
The Other ◽  
Abaxial Surface ◽  
South Wales ◽  
Central Column ◽  
A New Species

The vegetative and reproductive morphology of Vesselowskya Pampanini, southern marara, is described and illustrated in detail. The variation within V. rubifolia (F.Muell.) Pampanini sens. lat. is shown to be greater than has previously been recognised, with the differences identified supporting the recognition of a new segregate species, V. venusta Rozefelds, R.W.Barnes and Pellow sp. nov. Vesselowskya venusta occurs in the Barrington Tops Plateau of New South Wales and differs from V. rubifolia in possessing hairs on the abaxial surface of the sepals and lacking both a prominent distal connective protrusion on the anthers and colleters at the base of the stipules. The two Vesselowskya species are dioecious with a vestigial ovary in staminate flowers and reduced stamens in pistillate flowers. Dioecy is more pronounced in Vesselowskya, than in some Weinmannia species, and in both genera is expressed through reduction in the size of the ovaries in staminate flowers, and stamens in pistillate flowers. Vesselowskya shares with the other genera in the tribe Cunonieae (Pancheria, Weinmannia and Cunonia), a central column in the fruits, and Cunonia-type stipules, but differs from these genera in having valvate aestivation, digitate leaves, craspedodromous secondary venation with secondary veins terminating at a tooth, tuft domatia along the midrib, adaxial epidermal cells with strongly sinuous cell walls and the absence of hydathodes.

scholarly journals A NEW SPECIES OF NECKERA (NECKERACEAE, BRYOPSIDA) FROM XIZANG, CHINA

2007 ◽  
Vol 64 (3) ◽  
pp. 295-301 ◽  
Author(s):  
J. Enroth ◽  
M. Ji
Keyword(s):  
New Species ◽  
Cell Walls ◽  
The Other ◽  
Leaf Cell ◽  
Leaf Base ◽  
Asian Group ◽  
Leaf Apex ◽  
A New Species

A new species of Neckeraceae, Neckera serrulatifolia Enroth & M.Ji, is described from Xizang (Tibet), China. It belongs in an Asian group of relatively robust, distinctly stipitate species with an obtuse leaf apex, relatively long costa and strongly incrassate-porose leaf cell walls, but differs from the other species by the combination of strongly complanate and undulate branch leaves, long leaf decurrencies, and serrulate margins at leaf base and at midleaf. The sporophytes remain unknown.

A new species of Neckera (Neckeraceae, Bryophyta) from northern Vietnam

Phytotaxa ◽  
2015 ◽  
Vol 195 (2) ◽  
pp. 178 ◽  
Author(s):  
Johannes Enroth ◽  
ANDRIES TOUW
Keyword(s):  
New Species ◽  
Cell Walls ◽  
Leaf Length ◽  
Leaf Cell ◽  
Northern Vietnam ◽  
A New Species

Neckera praetermissa Enroth & Touw spec. nov. (Neckeraceae) is described from northern Vietnam. It is morphologically closest to the SE Asian N. undulatifolia (Tix.) Enroth, with which it shares the similar, ovate-ligulate and symmetric leaves with coarsely dentate apices, and strongly incrassate and porose leaf cell walls. However, N. undulatifolia has the stems up to 10 cm long and a distinct costa reaching to 5/6 of leaf length, while the stems of N. praetermissa are to c. 3 cm long and the leaves are ecostate or with a weak costa reaching to 1/6 of leaf length at most.

scholarly journals A new cyanobacterial species of Anabaena genus (Nostocales, Cyanobacteria) from Bulgaria

2016 ◽  
pp. 69-72
Author(s):  
Ivan Kirilov Kirjakov ◽  
Katya Naneva Velichkova
Keyword(s):  
New Species ◽  
Cell Walls ◽  
Vegetative Cells ◽  
Cyanobacterial Species ◽  
A New Species ◽  
Cyanobacterial Genus

Se describe una nueva especie del género de Cyanobacterias, Anabaena Bory ex Born. et Flah. (Nostocales) de las montañas Ródope de Bulgaria. Anabaena rhodopensis sp. nova. tiene acinetas con paredes celulares esculpidas. Se dan los datos biométricos para el tamaño de las células vegetativas, heterocistos y acinetos.A new species of cyanobacterial genus Anabaena Bory ex Born. et Flah. (Nostocales) from Rhodope Mountains in Bulgaria is described. Anabaena rhodopensis sp. nova. has akinetes with sculptured cell walls. Biometrical data for size of vegetative cells, heterocytes and akinetes are given.

scholarly journals ACETOBACTER TURBIDANS: A NEW SPECIES OF ACETIC ACID-PRODUCING BACTERIUM

1942 ◽  
Vol 48 (2) ◽  
pp. 82-86 ◽  
Author(s):  
A. J. Curtin Cosbie ◽  
J. Tosic ◽  
T. K. Walker
Keyword(s):  
Acetic Acid ◽  
New Species ◽  
A New Species

A new species and a new variety of Radula Dumort. (Radulaceae, Marchantiophyta) from Brazil

Phytotaxa ◽  
2020 ◽  
Vol 454 (1) ◽  
pp. 24-30
Author(s):  
FUVIO RUBENS OLIVEIRA-DA-SILVA ◽  
S. ROBBERT GRADSTEIN ◽  
ANNA LUIZA ILKIU-BORGES
Keyword(s):  
New Species ◽  
New Taxa ◽  
Cell Walls ◽  
Rio De Janeiro ◽  
Full Description ◽  
Taxonomic Study ◽  
Leaf Base ◽  
New Variety ◽  
A New Species

In the course of a taxonomic study of Radula in Brazil, a new species from Bahia and a new variety of R. fendleri from Rio de Janeiro were detected. The new species is characterized by plants irregularly pinnate, leaves oblong-ovate with entire to sinuate margins, cell walls with small trigones at leaf base and midleaf, increasing in size toward the leaf margins, and lobules distant to subimbricate with a rounded base, covering 2/3 to fully overlapping the stem. The new variety differs from the type variety by plants paroicous, leaf cells with trigones small or lacking, and absence of caducous leaves. A full description and illustration of the new taxa as well as comments on morphology, taxonomy, and distribution are provided.

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