The Role of the Scanning Electron Microscope in Plant Anatomy

Kew Bulletin ◽  
1973 ◽  
Vol 28 (1) ◽  
pp. 105 ◽  
Author(s):  
Margaret Y. Stant
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Plant Anatomy ◽  
Scanning Electron

scholarly journals The Carotid Siphon: A Scanning Electron Microscope Assessment of its Embolie Potential

1985 ◽  
Vol 12 (3) ◽  
pp. 263-266 ◽  
Author(s):  
F.W. Saunders ◽  
P. Shedden
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Clinical Studies ◽  
Carotid Bifurcation ◽  
Scanning Electron Microscope Study ◽  
Embolic Material ◽  
Carotid Siphon ◽  
Morphologic Data ◽  
Scanning Electron

ABSTRACT:The role of the carotid siphon as a source of embolic material has had limited morphological or clinical study. The morphologic data available suggests that the siphon plays only a small role in embolic cerebrovascular disease. Clinical studies, however, suggest that it has a significant ischemic potential. To clarify this apparent discrepancy, we have designed a scanning electron microscope study of the carotid siphon. Eighty percent of the specimens from the carotid bifurcation and 30% of the siphon specimens showed evidence of damaged endothelium with attached red cell and platelet debris. The embolic potential of the siphon is estimated to be between ⅓ to ½ that of the carotid bifurcation. This supports the most recent clinical studies.

scholarly journals The Role of Aragonite in Producing the Microstructural Diversity of Serpulid Skeletons

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1435
Author(s):  
Olev Vinn
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Deep Ocean ◽  
X Ray ◽  
Prismatic Structure ◽  
Wide Range ◽  
Different Types ◽  
Scanning Electron

Aragonite plays an important role in the biomineralization of serpulid polychaetes. Aragonitic structures are present in a wide range of serpulid species, but they mostly belong to one clade. Aragonitic structures are present in a wide range of marine environments, including the deep ocean. Aragonitic tube microstructures were studied using a scanning electron microscope. X-ray powder diffraction was used to identify the aragonite. Aragonite is used to build five different types of microstructures in serpulid tubes. The most common aragonitic irregularly oriented prismatic structure (AIOP) is also, evolutionarily, the most primitive. Some aragonitic microstructures, such as the spherulitic prismatic (SPHP) structure, have likely evolved from the AIOP structure. Aragonitic microstructures in serpulids are far less numerous than calcitic microstructures, and they lack the complexity of advanced calcitic microstructures. The reason why aragonitic microstructures have remained less evolvable than calcitic microstructures is currently unknown, considering their fit with the current aragonite sea conditions (Paleogene–recent).

The Role of Alum in the Fabrication of Calcium Silicate for Dissolved Acetylene Cylinders

2011 ◽  
Vol 117-119 ◽  
pp. 870-872
Author(s):  
Shi Cai Cui ◽  
Zhao Bo Meng
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Calcium Silicate ◽  
Filling Material ◽  
X Ray ◽  
Comprehensive Performance ◽  
Scanning Electron

Calcium silicate for filling material used in dissolved acetylene cylinders was prepared by adding alum as additive. Samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of alum on the bleeding, shrinkage, strength, porosity, morphology and phase composition were studied. The experimental results show that the adding of alum can improve the comprehensive performance of samples. The mechanism was discussed in detail.

scholarly journals Comparative anatomy of the leaves of Piper lepturum(Kunth) C.DC. var. lepturum and Piper lepturum var. angustifolium (C.DC.) Yunck.

Hoehnea ◽  
2015 ◽  
Vol 42 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Nelson Santana de Oliveira Machado ◽  
Flaviane Gomes Pereira ◽  
Paulo Roberto Dias dos Santos ◽  
Cecília Gonçalves Costa ◽  
Elsie Franklin Guimarães
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Histological Analysis ◽  
Comparative Anatomy ◽  
Plant Anatomy ◽  
Epidermal Cells ◽  
Leaf Surfaces ◽  
Scanning Electron

This study showed anatomical differences related to Piper lepturumvar. lepturum and P. lepturum var. angustifolium species, sometimes considered varieties and in other cases synonyms. For histological analysis, fully expanded leaves were collected and for analysis by scanning electron microscope (SEM), fragments from the midrib were fixed on both leaf surfaces. The two species revealed differences in plant anatomy and it was observed that the stem of P. lepturum var. lepturum showed persistent wings and papillary epidermal cells, and these characters are absent in P. lepturum var. angustifolium. There was also the presence of raphides only in the lamina leaf and petiole of P. lepturum var. angustifolium, differentiating the two species. Recent studies have shown the importance of plant anatomy with species where there are issues related to taxonomic delimitation.

Nematodirus battus: scanning electron microscope studies of the duodenal mucosa of infected lambs

Parasitology ◽  
1980 ◽  
Vol 81 (3) ◽  
pp. 573-578 ◽  
Author(s):  
Jean Martin ◽  
D. L. Lee
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Goblet Cells ◽  
Duodenal Mucosa ◽  
Intestinal Damage ◽  
Third Stage ◽  
Scanning Electron

SUMMARYLambs given 60000 third-stage larvae of Nematodirus battus were killed on days 16, 20, 22, 24 and 32 of the infection and the duodenal mucosa was examined by scanning electron microscopy (SEM). On day 16 of the infection the villi were long and finger-like and, although goblet cells were visible, the surface of the villi was not extensively folded, as is the surface of villi of uninfected control animals. By day 20 of the infection the villi had been reduced to flattened, plate-like structures or had formed low, irregular-shaped ridges. On this day of the infection the nematodes appeared to be enclosed by mucus-like material. As the infection progressed the intestinal damage was repaired, so that, by day 24 of the infection, the surface of the intestine was covered by short, smooth, finger-like projections and, by day 32 of the infection, the morphology of the intestine was somewhat similar to that of the control lamb. The possible role of villus atrophy and of mucus in the rejection of N. battus from the intestine is discussed.

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