Lectotype, epitype and amendment of Gastrodia angusta (Orchidaceae)

Phytotaxa ◽  
2018 ◽  
Vol 356 (4) ◽  
pp. 291
Author(s):  
JIAN-WU LI ◽  
LU-QI HUANG ◽  
GUO-WU LI ◽  
BO PAN ◽  
JIAN-TAO YIN ◽  
...  
Keyword(s):  
Outer Surface ◽  
Yunnan Province ◽  
Yellow Powder ◽  
Orange Yellow ◽  
Powder Particles ◽  
Key Characters

Gastrodia angusta S. Chow et S. C. Chen was established in 1983 from Shiping County, Yunnan Province, China. However, the specimens cited were erroneous: 3 type and 1 isotype were apparently collected on two different days and in different places. Moreover, the description omitted some key characters, including outer surface of sepals lobes with mid-vine convex and with 3–5 dens, margins sometimes irregular erose, lip triangular-oblong, epichile margins undulate and irregular erose, apex rounded and sometime irregular erose, disc with a longitudinal yellow, rugose, 2 mm wide belt, margins of mesochile retrousse and folded, forming two upright, semi-orbicular lamella on hypochile, lamellae inside densely with orange-yellow powder particles (pseudo-pollen). We have therefore designated a lectotype and epitype, and provide a revised description.

Influence of the grain shape and their preferred orientation on the achievable density and strength of powder billets

2021 ◽  
pp. 392-400
Author(s):  
A.M. Dmitriev ◽  
N.V. Korobova
Keyword(s):  
Mathematical Model ◽  
Iron Powder ◽  
Cross Section ◽  
Outer Surface ◽  
Grain Shape ◽  
Magnetic Pulse ◽  
Static Compression ◽  
Pulse Processing ◽  
Cylindrical Parts ◽  
Powder Particles

The achievable density of the workpieces under all-round static compression of the compacting iron powder is analyzed. The schemes of forming billets with a shift of powder particles are described, including during magnetic-pulse processing of the powder and the billet being formed. A mathematical model of the orientation of iron powder particles in cylindrical billets molded with intense shears between the particles is presented. Rational angles of orientation of particles are recommended in the manufacture of cylindrical parts with uniformly distributed properties in the cross section or with the greatest strength near the outer surface.

A review of the genus Anthocomus Erichson, 1840 (Coleoptera, Cleroidea, Malachiidae) species of Inner Asia

Zootaxa ◽  
2021 ◽  
Vol 4969 (3) ◽  
pp. 511-525
Author(s):  
SERGEI E. TSHERNYSHEV
Keyword(s):  
New Species ◽  
Species Diversity ◽  
Yunnan Province ◽  
Metallic Luster ◽  
Inner Asia ◽  
Orange Yellow ◽  
A New Species

The distribution and species diversity of the genus Anthocomus Erichson, 1840 of Inner Asia are discussed. Nine species, Anthocomus (Celidus) equestris (Fabricius, 1781), Anthocomus (Anthocomus) abdominalis Pic, 1903, A.( A.) coreanus Pic, 1911, A. (A.) cyaneipennis Wittmer, 1940, A. (A.) limbellus (Wittmer, 1953), A. (A.) lineatipennis Wittmer, 1995, A. (A.) mongolicus Wittmer, 1969, A. (A.) similicornis Wittmer, 1999 and A. (A.) testaceoterminalis Wittmer, 1995 known from the region and adjacent territories are reviewed. The placement of four species, ? A. (A.) coreanus Pic, 1911, ? A. (A.) cyaneipennis Wittmer, 1940, ? A. (A.) limbellus (Wittmer, 1953) and ? A. (A.) mongolicus Wittmer, 1969 in the genus Anthocomus Erichson is discussed as doubtful. A new species, Anthocomus (Anthocomus) kovali Tshernyshev, sp. n. from Wexi mountains, Yunnan Province, China is described and illustrated. The new species differs in its monochromous orange-yellow elytra with orange-red apical impressions yellow within, appendages orange-brown, head, pronotum, scutellum and palpi dark brown to black and lacking metallic luster, antennae dark brown.  

Armillaria xiaocaobaensis sp. nov. from China

Mycotaxon ◽  
2020 ◽  
Vol 135 (2) ◽  
pp. 431-441
Author(s):  
Jia-Hua Peng ◽  
Chang-Lin Zhao
Keyword(s):  
Yunnan Province ◽  
Fungal Species ◽  
Sequence Analyses ◽  
Hyphal System ◽  
Orange Yellow ◽  
Pileus Surface ◽  
Distinct Taxon ◽  
Molecular Characters

A new wood-inhabiting fungal species from Yunnan Province, China, is proposed based on morphological and molecular characters. Armillaria xiaocaobaensis is characterized by a central stipe, striate to furrowed orange yellow to pinkish brown pileus surface, membranous annulus, and ellipsoid, a monomitic hyphal system with generative hyphae bearing simple septa, and slightly thick-walled basidiospores averaging 7.7 × 4.9 μm. TEF1 sequence analyses support A. xiaocaobaensis as a distinct taxon in Armillaria.

A scanning electron microscopic study on dissolving process of cholesterol gallstones by chenodeoxycholic acid (CDCA)

1978 ◽  
Vol 36 (2) ◽  
pp. 522-523
Author(s):  
T. Kanetaka ◽  
M. Cho ◽  
S. Kawamura ◽  
T. Sado ◽  
K. Hara
Keyword(s):  
Electron Microscope ◽  
Chenodeoxycholic Acid ◽  
Outer Surface ◽  
Electron Microscopic ◽  
Cholesterol Gallstones ◽  
The Core ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Acceleration Voltage ◽  
Scanning Electron

The authors have investigated the dissolution process of human cholesterol gallstones using a scanning electron microscope(SEM). This study was carried out by comparing control gallstones incubated in beagle bile with gallstones obtained from patients who were treated with chenodeoxycholic acid(CDCA).The cholesterol gallstones for this study were obtained from 14 patients. Three control patients were treated without CDCA and eleven patients were treated with CDCA 300-600 mg/day for periods ranging from four to twenty five months. It was confirmed through chemical analysis that these gallstones contained more than 80% cholesterol in both the outer surface and the core.The specimen were obtained from the outer surface and the core of the gallstones. Each specimen was attached to alminum sheet and coated with carbon to 100Å thickness. The SEM observation was made by Hitachi S-550 with 20 kV acceleration voltage and with 60-20, 000X magnification.

A SEM and Light Microscope Study of the Epidermal Leaf Structures of the Carnivorous Plant, Sarracenia purpurea, L.

1971 ◽  
Vol 29 ◽  
pp. 358-359
Author(s):  
B. J. Panessa ◽  
J. F. Gennaro
Keyword(s):  
Methylene Blue ◽  
Toluidine Blue ◽  
Outer Surface ◽  
Microscope Study ◽  
Light Microscope ◽  
Carnivorous Plant ◽  
Sarracenia Purpurea ◽  
Inner Surface

Tissue from the hood and sarcophagus regions were fixed in 6% glutaraldehyde in 1 M.cacodylate buffer and washed in buffer. Tissue for SEM was partially dried, attached to aluminium targets with silver conducting paint, carbon-gold coated(100-500Å), and examined in a Kent Cambridge Stereoscan S4. Tissue for the light microscope was post fixed in 1% aqueous OsO4, dehydrated in acetone (4°C), embedded in Epon 812 and sectioned at ½u on a Sorvall MT 2 ultramicrotome. Cross and longitudinal sections were cut and stained with PAS, 0.5% toluidine blue and 1% azure II-methylene blue. Measurements were made from both SEM and Light micrographs.The tissue had two structurally distinct surfaces, an outer surface with small (225-500 µ) pubescent hairs (12/mm2), numerous stoma (77/mm2), and nectar glands(8/mm2); and an inner surface with large (784-1000 µ)stiff hairs(4/mm2), fewer stoma (46/mm2) and larger, more complex glands(16/mm2), presumably of a digestive nature.

On the Origin of the Microscystalline Structure in Rapidly Solidified IN-100 Powder

1977 ◽  
Vol 35 ◽  
pp. 260-261
Author(s):  
J. M. Walsh ◽  
K. P. Gumz ◽  
J. C. Whittles ◽  
B. H. Kear
Keyword(s):  
The Other ◽  
Coarse Grained ◽  
Microcrystalline Structure ◽  
Routine Examination ◽  
Atomization Process ◽  
Centrifugal Atomization ◽  
Splat Quenching ◽  
Powder Particles ◽  
Dendritic Microstructures ◽  
Rapidly Solidified

During a routine examination of the microstructure of rapidly solidified IN-100 powder, produced by a newly-developed centrifugal atomization process1, essentially two distinct types of microstructure were identified. When a high melt superheat is maintained during atomization, the powder particles are predominantly coarse-grained, equiaxed or columnar, with distinctly dendritic microstructures, Figs, la and 4a. On the other hand, when the melt superheat is reduced by increasing the heat flow to the disc of the rotary atomizer, the powder particles are predominantly microcrystalline in character, with typically one dendrite per grain, Figs, lb and 4b. In what follows, evidence is presented that strongly supports the view that the unusual microcrystalline structure has its origin in dendrite erosion occurring in a 'mushy zone' of dynamic solidification on the disc of the rotary atomizer.The critical observations were made on atomized material that had undergone 'splat-quenching' on previously solidified, chilled substrate particles.

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

Shock consolidation of Ni-Ti alloy powder

1986 ◽  
Vol 44 ◽  
pp. 430-431
Author(s):  
Naresh N. Thadhani ◽  
Thad Vreeland ◽  
Thomas J. Ahrens
Keyword(s):  
Alloy Powder ◽  
Amorphous Material ◽  
Ti Alloy ◽  
Two Phase ◽  
Near Surface ◽  
Optical Micrograph ◽  
Shock Compaction ◽  
Powder Particles ◽  
Ti Powder ◽  
Rapidly Solidified

A spherically-shaped, microcrystalline Ni-Ti alloy powder having fairly nonhomogeneous particle size distribution and chemical composition was consolidated with shock input energy of 316 kJ/kg. In the process of consolidation, shock energy is preferentially input at particle surfaces, resulting in melting of near-surface material and interparticle welding. The Ni-Ti powder particles were 2-60 μm in diameter (Fig. 1). About 30-40% of the powder particles were Ni-65wt% and balance were Ni-45wt%Ti (estimated by EMPA).Upon shock compaction, the two phase Ni-Ti powder particles were bonded together by the interparticle melt which rapidly solidified, usually to amorphous material. Fig. 2 is an optical micrograph (in plane of shock) of the consolidated Ni-Ti alloy powder, showing the particles with different etching contrast.

Cristal-growth dynamics of n-doped gaAs

1992 ◽  
Vol 50 (2) ◽  
pp. 1544-1545
Author(s):  
Pham V. Huong ◽  
Stéphanie Bouchet ◽  
Jean-Claude Launay
Keyword(s):  
Crystal Growth ◽  
Spatial Resolution ◽  
Epitaxial Layer ◽  
Outer Surface ◽  
Gaas Substrate ◽  
Structural Modification ◽  
Growth Dynamics ◽  
Argon Laser ◽  
High Anisotropy ◽  
Crystal Gaas

Microstructure of epitaxial layers of doped GaAs and its crystal growth dynamics on single crystal GaAs substrate were studied by Raman microspectroscopy with a Dilor OMARS instrument equipped with a 1024 photodiode multichannel detector and a ion-argon laser Spectra-Physics emitting at 514.5 nm.The spatial resolution of this technique, less than 1 μm2, allows the recording of Raman spectra at several spots in function of thickness, from the substrate to the outer deposit, including areas around the interface (Fig.l).The high anisotropy of the LO and TO Raman bands is indicative of the orientation of the epitaxial layer as well as of the structural modification in the deposit and in the substrate at the interface.With Sn doped, the epitaxial layer also presents plasmon in Raman scattering. This fact is already very well known, but we additionally observed that its frequency increases with the thickness of the deposit. For a sample with electron density 1020 cm-3, the plasmon L+ appears at 930 and 790 cm-1 near the outer surface.

High spatial resolution AEM observations of yttrium segregation in chromia scales grown on Co-45%Cr

1986 ◽  
Vol 44 ◽  
pp. 518-519
Author(s):  
K. Przybylski ◽  
A. J. Garratt-Reed ◽  
G. J. Yurek
Keyword(s):  
Spatial Resolution ◽  
Outer Surface ◽  
Maximum Concentration ◽  
High Spatial Resolution ◽  
Reactive Elements ◽  
Chromia Scales

The addition of so-called “reactive” elements such as yttrium to alloys is known to enhance the protective nature of Cr2O3 or Al2O3 scales. However, the mechanism by which this enhancement is achieved remains unclear. An A.E.M. study has been performed of scales grown at 1000°C for 25 hr. in pure O2 on Co-45%Cr implanted at 70 keV with 2x1016 atoms/cm2 of yttrium. In the unoxidized alloys it was calculated that the maximum concentration of Y was 13.9 wt% at a depth of about 17 nm. SIMS results showed that in the scale the yttrium remained near the outer surface.

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