Ultrastructure of conidiogenesis in Scopulariopsis brevicaulis

1971 ◽  
Vol 49 (5) ◽  
pp. 745-755 ◽  
Author(s):  
Garry T. Cole ◽  
H. C. Aldrich
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Scopulariopsis Brevicaulis ◽  
Freeze Etching ◽  
Cytological Changes ◽  
Relationship Of ◽  
The Relationship ◽  
Fungi Imperfecti ◽  
Scanning Electron

An ultrastructural study of conidia and conidiogenous cells of Scopulariopsis brevicaulis (Sacc.) Bain. in various stages of development is presented using transmission and scanning electron microscope and freeze-etching techniques. Septa between both fertile and vegetative cells are examined. The development of the double septum is outlined and mechanisms are suggested to explain conidium secession. Cytological changes which occur in the developing conidium initial are illustrated and their possible association with wall synthesis and deposition is noted. Change in the orientation of rodlets occurs on the walls of frozen-etched conidia at different stages of formation. The relationship of this phenomenon to conidium development is discussed. Description of the nature of wall relations during conidium ontogeny is stressed because of its importance in a classification of Fungi Imperfecti based on developmental characters of the reproductive cells. A diagrammatic interpretation of the sequence of formation of wall layers of the developing conidium is presented.

An Inverse Relation Between Cell Density and the Number of Microvilli in Cultures of BHK 21 Hamster Fibroblasts

1970 ◽  
Vol 7 (3) ◽  
pp. 695-709
Author(s):  
C. H. O'NEILL ◽  
E. A. C. FOLLETT
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Monolayer Culture ◽  
Cell Contact ◽  
Inverse Relation ◽  
Culture Density ◽  
Microscope Technique ◽  
The Relationship ◽  
Number Of Cells ◽  
Scanning Electron

The relationship between culture density and the number of microvilli on the cell surface has been studied using BHK21 cells in established monolayer culture. The number of microvilli can be estimated quantitatively by a scanning electron-microscope technique. It can be increased by applying specific antiserum, but whether antibody is applied or not a significant number of cells regularly bear microvilli. This number is characteristic of the culture density. In sparse cultures above a certain minimum density it is relatively high, and in confluent cultures it is much reduced. These results indicate that microvilli may be inhibited by cell contact.

The Effect of Surface Finish on Zinc Whisker Growth

2012 ◽  
Vol 472-475 ◽  
pp. 2756-2759
Author(s):  
Wen Cui ◽  
Shao Jun Qi
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Finish ◽  
Whisker Growth ◽  
Experimental Conditions ◽  
Steel Substrates ◽  
The Relationship ◽  
Rough Surface Finish ◽  
Scanning Electron ◽  
Effect Of Surface

To understand the relationship between surface finish and zinc whisker growth, this study investigated the growth of whiskers on two mild steel substrates of different surface finish by Field Emission Gun Scanning Electron Microscope (FEG SEM). Results show that, under the same experimental conditions, deposits on substrates with a mirror finish grew less whiskers and nodules than substrates with a rough surface finish.

scholarly journals Taxonomic significance of spermoderm pattern in Cucurbitaceae

2013 ◽  
Vol 20 (1) ◽  
pp. 61-65
Author(s):  
M. Ajmal Ali ◽  
Fahad M.A. Al-Hemaid ◽  
Arun K. Pandey ◽  
Joongku Lee
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cucumis Melo ◽  
Taxonomic Significance ◽  
Citrullus Colocynthis ◽  
Benincasa Hispida ◽  
The Family ◽  
Plant Taxon ◽  
Relationship Of ◽  
Scanning Electron

Studies on spermoderm using scanning electron microscope (SEM) were undertaken in 12 taxa under 11 genera of the family Cucurbitaceae sampled from India, China and Korea. The spermoderm pattern in the studied taxa varies from rugulate, reticulate to colliculate type. The spermoderm shows rugulate type in Benincasa hispida and Sicyos angulatus; reticulate type in Citrullus colocynthis, Cucumis melo var. agrestis, Diplocyclos palmatus, Hemsleya longivillosa, Luffa echinata, Momordica charantia, M. cymbalaria, Schizopepon bryoniifolius, and Trichosanthes cucumerina; and colliculate type  in Gynostemma laxiflorum. The present study clearly reveals that the testa features greatly varies across the genera which can be used as micromorphological markers for identification as well as character states for deducing relationship of the taxa within the family.DOI: http://dx.doi.org/10.3329/bjpt.v20i1.15465Bangladesh J. Plant Taxon. 20(1): 61-65, 2013 (June)

scholarly journals Palyno-morphology of Hedera L. (The ivy genus, araliaceae) and their systematics implications

Genetika ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 851-865
Author(s):  
Fahimeh Fallah ◽  
Farrokh Ghahremaninejad
Keyword(s):  
Grain Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Hedera Helix ◽  
Transmission Electron ◽  
Pollen Grain Size ◽  
The Relationship ◽  
Scanning Electron

The palynomorphological characteristics of 5 species belonging to Hedera of the Araliaceae family were studied in detail. These plant species were collected from various phytogeographical regions of Iran and Hungary. The palynological investigation was accomplished using Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM). Pollen grains of the species are reticulate, prolate, sub-prolate, tricolporate, isopolar, radially symmetrical, and monad. The largest pollen grain was in the Hedera colchica species (72.24?1.6 ?m) and the smallest pollen grain was in Hedera helix (28.63?2.1 ?m). The research carried out by the TEM showed that the species were different in terms of exine thickness, tectum thickness, foot layer thickness, the diameter and length of the Columella, the thickness and shape of the Caput, the tectum to foot layer )T/F( ratio, the absence or presence of the Endexine and the thickness of the Intine layers. The main purpose of this study was the importance of the relationship between pollen grain size and the number of chromosomes and ploidy level in Hedera species.

Fabrication of Microchannels on SiC Substrate by Femtosecond Laser

2012 ◽  
Vol 557-559 ◽  
pp. 1322-1325 ◽  
Author(s):  
Yi He Li ◽  
Hua Xiao ◽  
Gong Yi Li ◽  
Jian Feng ◽  
Xiao Dong Li
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
Laser Pulse ◽  
Scanning Electron Microscope ◽  
Femtosecond Laser ◽  
Optical Microscope ◽  
Pdms Stamp ◽  
The Relationship ◽  
Scanning Electron ◽  
Micro Patterns

A novel femtosecond laser directly writing method was utilized to fabricate microchannels on silicon carbide (SiC) substrate. The micro patterns were transferred to a Polydimethylsiloxane (PDMS) stamp, characterized by both optical microscope and scanning electron microscope (SEM). The relationship between size (depth and width) of channels and power of laser pulse were discussed in detail.

scholarly journals Semiautomatic classification of cementitious materials using scanning electron microscope images

2015 ◽  
Vol 24 (6) ◽  
pp. 061109 ◽  
Author(s):  
Lucas Drumetz ◽  
Mauro Dalla Mura ◽  
Samuel Meulenyzer ◽  
Sébastien Lombard ◽  
Jocelyn Chanussot
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cementitious Materials ◽  
Microscope Images ◽  
Scanning Electron

The microscopic examination of the structure of sub-surface horizons of soils

1976 ◽  
Vol 8 (6) ◽  
pp. 348-354 ◽  
Author(s):  
P Bullock ◽  
C P Murphy
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Microscopic Examination ◽  
Soil Structure ◽  
Thin Sections ◽  
X Ray ◽  
Cultural Conditions ◽  
Structural Types ◽  
Scanning Electron

What is meant by “soil structure”? Microscopic examination of thin sections of soil, using such instruments as the polarising microscope, X-ray diffractometer and scanning electron microscope has enabled a classification of the components of soils and their structural types to be built up. Now with the aid of the image-analysing computer these components can be quantified rapidly, characteristics may be calculated and their behaviour under varying cultural conditions predicted.

scholarly journals Scanning electron microscope studies of Avena coleoptiles during primary leaf emergence

2014 ◽  
Vol 57 (4) ◽  
pp. 431-445 ◽  
Author(s):  
Norman R. Dollahon ◽  
Andrew B. Maksymowych ◽  
Maria Galanti ◽  
Joseph A. Orkwiszewski
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Vascular Tissue ◽  
Guard Cells ◽  
Primary Leaf ◽  
Scanning Electron Microscope Study ◽  
Leaf Emergence ◽  
The Relationship ◽  
Scanning Electron

A scanning electron microscope study of the fine structure of coleoptiles of <em>Avena sativa</em> L. cv. Clintford has revealed information about the relationship between aspects of coleoptilar structure and the emergence of the primary leaf. Stomata are located on the lateral sides of the coleoptile and arch across the apex. The location of the stomata and associated vascular tissue may play a role in the splitting of the coleoptile pore and influence the manner in which the primary leaf emerges. Details of the surface fine structure of the coleoptile pore, its associated cells, stomata and guard cells are presented.

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