Trachelomonas volzii vs T. dubia (Euglenophyceae)—one or two separate species? Study on similarities and differences of the species

Phytotaxa ◽  
2018 ◽  
Vol 357 (1) ◽  
pp. 1 ◽  
Author(s):  
MAŁGORZATA PONIEWOZIK ◽  
KONRAD WOŁOWSKI ◽  
JOLANTA PIĄTEK
Keyword(s):  
Electron Microscopy ◽  
The Other ◽  
New Combinations ◽  
Separate Species ◽  
Phenotypic Changes ◽  
The World ◽  
Key Features ◽  
Similarities And Differences ◽  
Species Study ◽  
Scanning Electron

This study concerns the two species Trachelomonas volzii and T. dubia which were examined for similarities and dissimilarities of their loricae and monads organization. We specifically focused on the key features of both species that were originally used to separate one from the other: annular thickening at the base of collar and dimensions and ornamentation of loricae. Loricae of specimens were examined by light and scanning electron microscopy and the results were compared with the literature data describing these taxa and reported occurrences in the world. The species together with their varieties and forms do not appear to have strong characteristics distinguishing them, rather the variability observed fits natural phenotypic changes. Based on evidence from this study, we recommend combining these two taxa and propose T. volzii as the single taxon. We also examined a set of varieties of original T. volzii since the species contained several varieties that were almost identical in relation to lorica structure and occurrence. As a result of these observations, we propose the following varieties: Trachelomonas volzii var. volzii as a nominative variety, T. volzii var. australis, T. volzii var. sulcata, T. volzii var. inflata, T. volzii var. acidophila. Furthermore, we propose reclassifying some taxa and the new combinations such as: T. dubia var. ornata to T. volzii var. ornata and T. dubia var. colliundulata to T. volzii var. colliundulata. In our opinion, T. dubia fo. acuminata should be included with the species T. hexangulata due to its unique, hexagonal shaped lorica.

2 Highlights

2018 ◽  
Author(s):  
Lichtenstein Natalie
Keyword(s):  
World Bank ◽  
The Other ◽  
Multilateral Development Banks ◽  
The World Bank ◽  
The World ◽  
Key Features ◽  
Similarities And Differences ◽  
Development Banks ◽  
Set Up

Chapter 2, Highlights, offers a survey of the key features of the AIIB Charter that define AIIB, in close comparison with the Charters of other multilateral development banks (AfDB, AsDB, EBRD, IADB and the World Bank). The highlights of the coming Chapters are summarized, offering answers to the basic questions about AIIB: Why establish AIIB? (Mandate, Chapter 3) What will AIIB do? (Investment Operations, Chapter 4) Who will join AIIB? (Membership, Chapter 5) How will AIIB be funded? (Capital and Finance, Chapter 6) How will AIIB be run? (Governance, Chapter 7) How was AIIB first set up? (Transitions, Chapter 8) How will the organization work? (Institutional Matters, Chapter 9). The Chapter concludes with some observations about heritage and innovation in the AIIB Charter, outlining principal similarities and differences with the other Charters.

Sellaphora labernardierei (Sellaphoraceae, Bacillariophyta), a new epilithic species from French spring and four new combinations within the genus Sellaphora

Phytotaxa ◽  
2016 ◽  
Vol 260 (3) ◽  
pp. 235 ◽  
Author(s):  
AUDE BEAUGER ◽  
CARLOS E. WETZEL ◽  
OLIVIER VOLDOIRE ◽  
ALEXANDRE GARREAU ◽  
LUC ECTOR
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Mineral Waters ◽  
New Combinations ◽  
French Massif Central ◽  
Small Species ◽  
Massif Central ◽  
Floristic Survey ◽  
Scanning Electron

During a floristic survey of freshwater springs in the French Massif Central region, a new Sellaphora species (Bacillariophyceae) was found and is hereby described: Sellaphora labernardierei sp. nov. This new small species, with linear to linear-elliptical valves, slightly inflated in the middle, is formally described using light and scanning electron microscopy. The species has a single H-shaped chloroplast and striae usually biseriate tending to be uniseriate near the centre of the valve. The valve dimensions, the valve, pole and central area shapes, and the striae density and pattern allow their separation from similar taxa belonging to the genera Eolimna, Naviculadicta and Sellaphora. The ecological preferences of Sellaphora labernardierei are mineral waters with high nitrate concentrations. The examination of similar taxa belonging to the genera Eolimna and Naviculadicta and their characteristics lead to propose four new combinations of Sellaphora species.

Use of electron microscopy to characterize the surfaces of flocculent and nonflocculent yeast cells

1989 ◽  
Vol 35 (12) ◽  
pp. 1081-1086 ◽  
Author(s):  
Byron F. Johnson ◽  
L. C. Sowden ◽  
Teena Walker ◽  
Bong Y. Yoo ◽  
Gode B. Calleja
Keyword(s):  
Electron Microscopy ◽  
Fission Yeast ◽  
Budding Yeast ◽  
The Other ◽  
Yeast Cells ◽  
Scanning Electron Micrographs ◽  
Soft Or ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Scanning Electron

The surfaces of flocculent and nonflocculent yeast cells have been examined by electron microscopy. Nonextractive preparative procedures for scanning electron microscopy allow comparison in which sharp or softened images of surface details (scars, etc.) are the criteria for relative abundance of flocculum material. Asexually flocculent budding-yeast cells cannot be distinguished from nonflocculent budding-yeast cells in scanning electron micrographs because the scar details of both are well resolved, being hard and sharp. On the other hand, flocculent fission-yeast cells are readily distinguished from nonflocculent cells because fission scars are mostly soft or obscured on flocculent cells, but sharp on nonflocculent cells. Sexually and asexually flocculent fission-yeast cells cannot be distinguished from one another as both are heavily clad in "mucilaginous" or "hairy" coverings. Examination of lightly extracted and heavily extracted flocculent fission-yeast cells by transmission electron microscopy provides micrographs consistent with the scanning electron micrographs.Key words: flocculation, budding yeast, fission yeast, scanning, transmission.

scholarly journals Effect of Surfactant Addition on Bi2Te3 Nanostructures Synthesized by Hydrothermal Method

2017 ◽  
Vol 62 (2) ◽  
pp. 1005-1010 ◽  
Author(s):  
Peyala Dharmaiah ◽  
C.H. Lee ◽  
B. Madavali ◽  
Soon-Jik Hong
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Method ◽  
Figure Of Merit ◽  
Bulk Sample ◽  
The Other ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coarse Grains ◽  
Scanning Electron ◽  
Nanostructured Sample

AbstractIn the present work, we have prepared Bi2Te3nanostructures with different morphologies such as nano-spherical, nanoplates and nanoflakes obtained using various surfactant additions (EG, PVP, and EDTA) by a hydrothermal method. The shape of the nanoparticles can be controlled by addition of surfactants. The samples were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the minority BiOCl phase disappears after maintained pH at 10 with EG as surfactant. SEM bulk microstructure reveals that the sample consists of fine and coarse grains. Temperature dependence of thermoelectric properties of the nanostructured bulk sample was investigated in the range of 300-450K. The presence of nanograins in the bulk sample exhibits a reduction of thermal conductivity and less effect on electrical conductivity. As a result, a figure of merit of the sintered bulk sample reached 0.2 at 400 K. A maximum micro Vickers hardness of 102 Hv was obtained for the nanostructured sample, which was higher than the other reported results.

scholarly journals Analysis of the type material of Achnanthes minutissima var. macrocephala (Bacillariophyta) and description of two new small capitate Achnanthidium species from Europe and the Himalaya

2019 ◽  
Vol 152 (2) ◽  
pp. 340-350
Author(s):  
Carlos E. Wetzel ◽  
Ingrid Jüttner ◽  
Smriti Gurung ◽  
Luc Ector
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Benthic Diatom ◽  
Original Material ◽  
Diatom Species ◽  
The World ◽  
Freshwater Habitats ◽  
The Himalaya ◽  
Scanning Electron ◽  
Achnanthes Minutissima

Background and aims – Two unknown benthic diatom species belonging to the genus Achnanthidium Kütz., and found in French and Nepalese freshwater habitats, were investigated. Both species are here described as new and compared with the original material of Achnanthes minutissima var. macrocephala Hust. [≡ Achnanthidium macrocephalum (Hust.) Round & Bukht.] from Indonesia. Methods – The morphology of three small and capitate Achnanthidium species was investigated using light microscopy (LM) and scanning electron microscopy (SEM). Key results – Achnanthidium coxianum sp. nov. (from the Himalaya) belongs to the group of species with hooked terminal raphe endings, while Achnanthidium peetersianum sp. nov. (from France) has variable terminal raphe endings which are usually slightly bent. Achnanthidium macrocephalum is a much rarer species and illustrations concerning its identity in the literature do not conform to the type studied here. Conclusions – The three species are similar in LM but clearly distinct in SEM. The shape of the areolae and terminal raphe endings separate the species. Achnanthidium macrocephalum has often been misidentified in studies from many areas of the world. It is similar to the new species in valve outline and in its small dimensions.

scholarly journals Wariancje semantyczne pojęcia "kołtuna" w wybranych tekstach kultury polskiej i litewskiej

LingVaria ◽  
2020 ◽  
pp. 179-198
Author(s):  
Zofia Sawaniewska-Mochowa ◽  
Małgorzata Kasner
Keyword(s):  
Negative Evaluation ◽  
The Other ◽  
Other Hand ◽  
The World ◽  
Similarities And Differences ◽  
Belles Lettres ◽  
Plica Polonica ◽  
Cultural Concept

SEMANTIC VARIATIONS OF THE CONCEPT OF KOŁTUN ‘POLISH PLAIT’ IN SELECTED TEXT OF POLISH AND LITHUANIAN CULTURES The paper discusses semantic changes and stylistic derivation of the cultural concept of kołtun ‘Polish plait’ (Plica polonica) in Polish and Lithuanian. Although today it is impossible to meet a person with a kołtun on their head, the concept itself, as an element of socially established knowledge of the world, has survived and is still used in various discourses (ranging from dialectal texts and folklore, belles-lettres and journalistic writing, to contemporary Internet messages), to communicate different meanings, both literal and metaphorical.There are similarities and differences between the conceptualizations of kołtun in texts of Polish and Lithuanian cultures. The unifying element is the perception of kołtun as a formation of entangled hair or a mysterious disease that is inscribed into the folk system of beliefs and magical rituals. On the other hand, what sets the analysed concept apart in the two languages, is a much richer resource of folk and colloquial forms (compounds, hybrid words, phrasemes) in Lithuanian, and in addition, the lack of negative evaluation of kołtun in Lithuanian, whereas in Polish the word is often used to describe a backward, small-minded person.

scholarly journals Ritual & Practices to Attain Spirituality in the light of Religious Scriptures of the World Religion

2019 ◽  
pp. 37-43
Author(s):  
Tayyaba Razzaq
Keyword(s):  
Research Study ◽  
The Other ◽  
Religious Communities ◽  
World Religion ◽  
World Religions ◽  
Major Purpose ◽  
The World ◽  
The Will ◽  
Similarities And Differences ◽  
Ritual Systems

Humans are spiritual beings and preferred to be an element (one way or the other) of this potent mighty power that fascinated him. Men have been urged to look or visualize the Mighty Lord. Different kind of tools and means were designed in various religious communities to offer a few beautified methods to meet this fundamental intuition. To attain spirituality, many ancient religions had their own rituals and ceremonial systems that mostly consist of external rites and practices. The purpose of the study is to examine and determine the importance of rituals that are being practice in the world religions? What the methods religious scriptures has mentioned for their followers to adopt to attain spirituality? The study is to find out similarities and differences in rituals & practices to attain spirituality as mentioned in their religious scriptures? Research methodology for this study adapted is descriptive. This research study has fined out that some ritual systems are concerned with inwards purification rather than outwards. The major purpose of all such practices; fasting, sacrifices, charity etc are all to free men from the entire evil deeds, make him pure as the will of the Lord and closer to it.

Problems associated with ageing squid from their statoliths: towards a more structured approach

1994 ◽  
Vol 6 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Marek R. Lipinski ◽  
M. Deon Durholtz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Regression Analysis ◽  
Light Microscopy ◽  
The Other ◽  
Etching Solution ◽  
Significant Difference ◽  
Structured Approach ◽  
Fish Otoliths ◽  
Scanning Electron

It appears that squid statoliths cannot yet be regarded as accurate an ageing tool as fish otoliths. Statoliths from the same pair, prepared differently for viewing and counting increments, were compared. Increment counts do not imply age in days, because this was not validated. One statolith from each pair was examined by light microscopy (LM) after preparation following a new method. The other was viewed by Scanning Electron microscopy (SEM) with a modified etching solution. Shape of each statolith was similar when compared by multiple regression analysis (11 variables, n=53). There was a weak but significant difference between sexes (statoliths of females were slightly larger). All other differences were insignificant. Microscopic observation and increment counts of increments were successfully carried out for 37 pairs of statoliths. Significant differences between two independent counts were found for the LM method, but no significant differences were found between two independent SEM counts. Counts were significantly different when interpreted by both LM and SEM, probably because of poor resolution in the LM readings and over-resolution (growth layers prominent and numerous) in those read by SEM. Recommendations are made on how ageing studies, based on statoliths, should be structured and the results evaluated.

Pollen morphology of Sabinaria magnifica (Cryosophileae, Coryphoideae, Arecaceae)

Phytotaxa ◽  
2015 ◽  
Vol 207 (1) ◽  
pp. 135 ◽  
Author(s):  
Giovanni Raul Bogota ◽  
Carina Hoorn ◽  
Wim Star ◽  
Rob Langelaan ◽  
Hannah Banks ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Light Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
The Other ◽  
Transmission Electron ◽  
Palm Species ◽  
Scanning Electron

Sabinaria magnifica is so far the only known species in the recently discovered tropical palm genus Sabinaria (Arecaceae). Here we present a complete description of the pollen morphology of this palm species based on light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We also made SEM-based comparisons of Sabinaria with other genera within the tribe Cryosophileae. Pollen grains of Sabinaria magnifica resemble the other genera in the heteropolar, slightly asymmetric monads, and the monosulcate and tectate exine with perforate surface. Nevertheless, there are some clear differences with Thrinax, Chelyocarpus and Cryosophila in terms of aperture and exine. S. magnifica differs from its closest relative, Itaya amicorum, in the exine structure. This study shows that a combination of microscope techniques is essential for the identification of different genera within the Cryosophileae and may also be a necessary when working with other palynologically less distinct palm genera. 

Talking over Water: History, Wireless and the Telephone

2007 ◽  
Vol 125 (1) ◽  
pp. 46-56
Author(s):  
Jock Given
Keyword(s):  
Twentieth Century ◽  
Real Time ◽  
The Other ◽  
Telephone Service ◽  
Water History ◽  
Morse Code ◽  
The World ◽  
Similarities And Differences ◽  
Submarine Cables ◽  
Economics And Politics

For a third of the twentieth century, the only way Antipodeans could talk with people on the other side of the world was by wireless. The submarine cables that traversed the oceans from the 1860s carried messages in Morse code, ‘telegraphy’, but not voice. From 30 April 1930, the wireless telephone service made it possible to conduct a conversation in real time between England and Australia. This article explores the old era of international wireless telephony at a time when wireless is again transforming social and economic possibilities. It examines the economics and politics of the era, the man most closely identified with the Australian services, the technology employed and the way the service was used, identifying similarities and differences between this period and the present.

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