Studies on type material from Kützing’s diatom collection VI:The identity of Diatoma liber Suhr (1831)

Phytotaxa ◽  
2021 ◽  
Vol 528 (3) ◽  
pp. 215-223
Author(s):  
DAVID M. WILLIAMS
Keyword(s):  
Type Material

N/A

An annotated checklist of mesoplodont whale species (Cetacea, Ziphiidae) discovered during the nineteenth century

2015 ◽  
Vol 42 (2) ◽  
pp. 226-235 ◽  
Author(s):  
G. N. H. Waller
Keyword(s):  
Nineteenth Century ◽  
Additional Data ◽  
Original Description ◽  
Type Specimen ◽  
External Morphology ◽  
Type Locality ◽  
Type Material ◽  
Beaked Whale ◽  
Registration Number ◽  
Annotated Checklist

Eight species of mesoplodont whales (genus Mesoplodon Gervais, 1850) named during the nineteenth century are based on valid descriptions. A checklist with the original description and type material for each of these species is provided. Additional data given may include type locality and illustrative sources, type material holding institution and type registration number(s). The only type specimen for which a record of external morphology was published relates to the 1803 stranding of Sowerby's beaked whale (Mesoplodon bidens).

Making Graphene-type Material via Polymerization of Porphyrin

2020 ◽  
Author(s):  
SANJIB KAR ◽  
Sruti Mondal ◽  
Kasturi Sahu ◽  
Dilruba Hasina ◽  
Tapobrata Som ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Polymeric Material ◽  
Single Layer ◽  
Type Material ◽  
Synthetic Pathway ◽  
Simple Chemical ◽  
Doped Graphene ◽  
Ring Nitrogen ◽  
2D Structure ◽  
Porphyrin Macrocycles

<p>The synthesis of new graphene-type materials (<i>via</i> polymerization of porphyrin macrocycles) through a simple chemical synthetic pathway (at RT) has been demonstrated. This newly synthesized material can be dispersed in water with an average sheet size of few microns and with single layer thickness. As the porphyrin contains four inner ring nitrogen atoms thus the presented polymeric material will be close analogous of N-doped graphene. Porphyrin as the key component to synthesize layered graphene type continuous 2D structure has never been attempted before. </p> <p> </p>

Review of Turkish crickets from the subfamily Gryllomorphinae (Orthoptera: Gryllidae)

2012 ◽  
Vol 21 (1) ◽  
pp. 28-59
Author(s):  
A.V. Gorochov ◽  
M. Ünal
Keyword(s):  
Type Material ◽  
Southern Coast ◽  
First Time

The fauna of Gryllomorphinae of Turkey is reviewed. Sixteen species and subspecies are established. Ovaliptila anamur sp. nov., O. anitli sp. nov., O. alanya sp. nov., O. alanya proxima subsp. nov., O. alara sp. nov., O. teke sp. nov., O. ibrahimi sp. nov., Glandulosa borisi sp. nov. and Gryllomorpha dalmatina minutissima subsp. nov. are described. Ovaliptila beroni (Popov, 1975), Glandulosa kinzelbachi Harz, 1979, G. harzi Gorochov, 1996 and Gryllomorpha Antalya Gorochov, 2009 are briefly characterized based on the type material. Ovaliptila buresi Mařan, 1958 is indicated as a rather widely distributed species in the western part of Anatolia (but not in the southern coast of this peninsula). Gryllomorpha dalmatina pieperi Harz, 1979, G. miramae Medvedev, 1933 and the nominotypical subspecies of G. miramae are recorded from Turkey for the first time, but both subspecies remain open to question.

Cordylite-(Ce); a crystal chemical investigation of material from four localities, including type material

1998 ◽  
Vol 83 (1-2) ◽  
pp. 178-184 ◽  
Author(s):  
Gerald Giester ◽  
Yunxiang Ni ◽  
Dietmar Jarosch ◽  
John M. Hughes ◽  
Jorn G. Ronsbo ◽  
...  
Keyword(s):  
Chemical Investigation ◽  
Type Material ◽  
Crystal Chemical

Contributions to the Knowledge of the Lichen Flora of the Himalayas III. On Lecanora Somervellii Paulson (Lichenized Ascomycotina, Lecanoraceae)

1992 ◽  
Vol 24 (2) ◽  
pp. 111-117
Author(s):  
W. Obermayer ◽  
J. Poelt
Keyword(s):  
Usnic Acid ◽  
Type Material ◽  
Lemon Yellow ◽  
High Altitudes ◽  
Yellow Colour ◽  
Alpine Species ◽  
The Alps ◽  
High Himalayas ◽  
Very High ◽  
Lichen Flora

Abstract The lichen Lecanora somervellii Paulson, first described from the northern slopes of Mt Everest in Tibet, has been collected at four other localities in the High Himalayas, at altitudes between 3750 and 5540 m. As the type material appears to be missing, a neotype is designated here. The species has an unusual lemon yellow colour due to the pigment calycin; this compound is in addition to usnic acid, which is widespread in Lecanora. Lecanora somervellii is otherwise very similar in essential characters to the complex including Lecanora concolor Ram. and L. orbicularis (Schaerer) Vainio, high alpine species well-known, for example, from the Alps. It is supposed, that L. somervellii is derived from this aggregate by the production of calycin (in addition to usnic acid), which acts as an additional protective pigment at these very high altitudes.

scholarly journals Theory of the Thermal Stability of Silicon Vacancies and Interstitials in 4H–SiC

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 167
Author(s):  
José Coutinho
Keyword(s):  
Thermal Stability ◽  
Fermi Level ◽  
Density Functional ◽  
Dynamic Properties ◽  
Type Material ◽  
Temperature Threshold ◽  
Effect Analysis ◽  
Mobile Species ◽  
Two Stages ◽  
Thermal Stability Of

This paper presents a theoretical study of the electronic and dynamic properties of silicon vacancies and self-interstitials in 4H–SiC using hybrid density functional methods. Several pending issues, mostly related to the thermal stability of this defect, are addressed. The silicon site vacancy and the carbon-related antisite-vacancy (CAV) pair are interpreted as a unique and bistable defect. It possesses a metastable negative-U neutral state, which “disproportionates” into VSi+ or VSi−, depending on the location of the Fermi level. The vacancy introduces a (−/+) transition, calculated at Ec−1.25 eV, which determines a temperature threshold for the annealing of VSi into CAV in n-type material due to a Fermi level crossing effect. Analysis of a configuration coordinate diagram allows us to conclude that VSi anneals out in two stages—at low temperatures (T≲600 °C) via capture of a mobile species (e.g., self-interstitials) and at higher temperatures (T≳1200 °C) via dissociation into VC and CSi defects. The Si interstitial (Sii) is also a negative-U defect, with metastable q=+1 and q=+3 states. These are the only paramagnetic states of the defect, and maybe that explains why it escaped detection, even in p-type material where the migration barriers are at least 2.7 eV high.

Identity of the oribatid mite Oribata curva and transfer to Trichogalumna (Acari, Oribatida, Galumnidae), with discussion of nomenclatural and biogeographical issues in the ‘curva’ species-group

Zootaxa ◽  
2017 ◽  
Vol 4272 (4) ◽  
pp. 551
Author(s):  
ROY A. NORTON ◽  
SERGEY G. ERMILOV
Keyword(s):  
North America ◽  
Oribatid Mite ◽  
Species Group ◽  
Type Material ◽  
Similar Species ◽  
History Of ◽  
Molecular Assessment

Based on the study of type material, other historical specimens, and new collections, the adult of the thelytokous oribatid mite Oribata curva Ewing, 1907 (Galumnidae) is redescribed and the name is recombined to Trichogalumna curva (Ewing, 1907) comb. nov. A confusing history of synonymies and misidentifications is traced in detail, and their effect on published statements about biogeography is assessed. Reliable records of T. curva are only those from North America. The tropical mite Pergalumna ventralis (Willmann, 1932) is not a subspecies of T. curva. The widely-reported Trichogalumna nipponica (Aoki, 1966) and other similar species form a complex with T. curva that needs further morphological and molecular assessment. 

scholarly journals The Effect of Liquid Rubber Addition on the Physicochemical Properties, Cytotoxicity and Ability to Inhibit Biofilm Formation of Dental Composites

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1704
Author(s):  
Krzysztof Pałka ◽  
Małgorzata Miazga-Karska ◽  
Joanna Pawłat ◽  
Joanna Kleczewska ◽  
Agata Przekora
Keyword(s):  
Cell Viability ◽  
Biofilm Formation ◽  
Bacterial Biofilm ◽  
Type Material ◽  
Dental Composites ◽  
Antibiofilm Activity ◽  
Ceramic Filler ◽  
Liquid Rubber ◽  
Flow Type ◽  
Type Composite

The aim of this study was to evaluate the effect of modification with liquid rubber on the adhesion to tooth tissues (enamel, dentin), wettability and ability to inhibit bacterial biofilm formation of resin-based dental composites. Two commercial composites (Flow-Art–flow type with 60% ceramic filler and Boston–packable type with 78% ceramic filler; both from Arkona Laboratorium Farmakologii Stomatologicznej, Nasutów, Poland) were modified by addition of 5% by weight (of resin) of a liquid methacrylate-terminated polybutadiene. Results showed that modification of the flow type composite significantly (p < 0.05) increased the shear bond strength values by 17% for enamel and by 33% for dentine. Addition of liquid rubber significantly (p < 0.05) reduced also hydrophilicity of the dental materials since the water contact angle was increased from 81–83° to 87–89°. Interestingly, modified packable type material showed improved antibiofilm activity against Steptococcus mutans and Streptococcus sanguinis (quantitative assay with crystal violet), but also cytotoxicity against eukaryotic cells since cell viability was reduced to 37% as proven in a direct-contact WST-8 test. Introduction of the same modification to the flow type material significantly improved its antibiofilm properties (biofilm reduction by approximately 6% compared to the unmodified material, p < 0.05) without cytotoxic effects against human fibroblasts (cell viability near 100%). Thus, modified flow type composite may be considered as a candidate to be used as restorative material since it exhibits both nontoxicity and antibiofilm properties.

Thermoelectric and Mechanical Properties of Novel Hot-Extruded PbTe n-Type Material

2012 ◽  
Vol 41 (6) ◽  
pp. 1057-1061 ◽  
Author(s):  
D. Vasilevskiy ◽  
R. A. Masut ◽  
S. Turenne
Keyword(s):  
Mechanical Properties ◽  
Type Material
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