A rod-like bacterium is responsible for high molybdenum concentrations in the tropical sponge Halichondria phakellioides

2014 ◽  
Vol 65 (9) ◽  
pp. 838 ◽  
Author(s):  
Constanza Buccella ◽  
Belinda Alvarez ◽  
Karen Gibb ◽  
Anna Padovan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sequence Analysis ◽  
Trace Element ◽  
Marine Sponge ◽  
Bacterial Symbiont ◽  
Sponge Tissue ◽  
Bacterial Symbionts ◽  
Transmission Electron ◽  
High Concentrations

The tropical marine sponge, Halichondria phakellioides, from Darwin Harbour contains high concentrations of molybdenum. A rod-like bacterium extracellular in sponge tissue was observed using transmission electron microscopy. Molybdenum was located within these bacteria, but not in sponge cells. This is the first report of the trace element molybdenum localised in a sponge bacterial symbiont. Many different bacterial symbionts were identified in the sponge by sequence analysis so the identity of the molybdenum-accumulating bacterium could only be inferred.

scholarly journals Phylogenetic Analysis And Searching Bovine Papillomaviruses In Teat Papillomatosis Cases In Cattle By Histopathological, Immunohistochemical And Transmission Electron Microscopy Methods

2021 ◽  
Author(s):  
Yakup Yıldırım ◽  
Mehmet Kale ◽  
Özlem Özmen ◽  
Abdurrahman Anıl Çağırgan ◽  
Sibel Hasırcıoğlu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sequence Analysis ◽  
Molecular Diagnosis ◽  
Degenerate Primers ◽  
Specific Primers ◽  
Virus Particles ◽  
Transmission Electron ◽  
Genus One ◽  
Epithelium Cells

Abstract Papillomaviruses are epitheliotropic viruses causing proliferations in skin, mucosa and various internal organs in different animal species. Especially due to lesions it causes in teats of cattle, it leads to important economical losses in milk sector. In this study, the aim was to diagnose bovine papillomaviruses (BPVs) causing teat papillomas in cattle by immunohistochemical, transmission electron microscopy (TEM) and molecular methods and to detect the defect on tissues by the virus using histopathological method. In addition to this, sequence analysis of the isolated field strains were to be carried out and their genetic and phylogenetic closeness with the strains within the literature were to be detected. After confirming teat papillomatosis in the collected samples using histopathological and immunohistochemical methods, other diagnosis methods were then used. During the TEM examination of teat lesions, intranuclear virus particles were seen in epithelium cells. After carrying out PCR using degenerate primers and type specific primers, 7 samples were detected as positive for BPV and these samples were used for typing using sequence analysis/PCR with type-specific primers. Within these analysis, three out of seven BPV isolates we collected from infected teat tissues of different cattle were detected as BPV-6, two as BPV-10, one as BPV-2 and one as BPV-8. Five isolates we isolated during sequence analysis of positive samples were found in Xipapillomavirus 1 genus, one in Epsilonpapillomavirus 1 genus and another in Deltapapillomavirus genus. As a result, in molecular diagnosis of BPV that takes place in etiology of teat papillomas, using type specific primers proved to be useful following the usage of genotyping in molecular diagnosis of BPV and generate primers in characterization. Detecting BPV types and their prevalence, taking biosafety measures in animal breeding and giving importance to vaccine studies was considered essential.

scholarly journals Ion Channeling Analysis of Gallium Nitride Implanted with Deuterium

1998 ◽  
Vol 537 ◽  
Author(s):  
W. R. Wampler ◽  
S. M. Myers
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gallium Nitride ◽  
Basal Plane ◽  
Large Fraction ◽  
Stacking Faults ◽  
Ion Channeling ◽  
Transmission Electron ◽  
High Concentrations

AbstractIon channeling and transmission electron microscopy were used to examine the microstructure of GaN implanted with deuterium (D) at high (>1 at. %) and low (< 0.1 at. %) D concentrations. At high concentrations, bubbles and basal-plane stacking faults were observed. Ion channeling showed the D was disordered relative to the GaN lattice, consistent with precipitation of D2 into bubbles. At low D concentrations, bubbles and stacking faults are absent and ion channeling shows that a large fraction of the D occupies sites near the center of the c-axis channel.

Insights into the mechanism of high lipid–detergent crystallization of membrane proteins

2021 ◽  
Vol 54 (6) ◽  
Author(s):  
Sofia Trampari ◽  
Caroline Neumann ◽  
Samuel J. Hjorth-Jensen ◽  
Azadeh Shahsavar ◽  
Esben M. Quistgaard ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Diagram ◽  
Transmission Electron Microscopy ◽  
Membrane Proteins ◽  
Membrane Protein ◽  
Detergent Concentration ◽  
Transmission Electron ◽  
High Lipid ◽  
High Concentrations

Obtaining well diffracting crystals of membrane proteins is often challenging, but chances can be improved by crystallizing them in lipidic conditions that mimic their natural membrane environments. One approach is the high lipid–detergent (HiLiDe) method, which works by mixing the target protein with high concentrations of lipid and detergent prior to crystallization. Although this approach is convenient and flexible, understanding the effects of systematically varying lipid/detergent ratios and a characterization of the lipid phases that form during crystallization would be useful. Here, a HiLiDe phase diagram is reported for the model membrane protein MhsT, which tracks the precipitation and crystallization zones as a function of lipid and detergent concentrations, and is augmented with data on crystal sizes and diffraction properties. Additionally, the crystallization of SERCA1a solubilized directly with native lipids is characterized as a function of detergent concentration. Finally, HiLiDe crystallization drops are analysed with transmission electron microscopy, which among other features reveals liposomes, stacked lamellae that may represent crystal precursors, and mature crystals with clearly discernible packing arrangements. The results emphasize the significance of optimizing lipid/detergent ratios over broad ranges and provide insights into the mechanism of HiLiDe crystallization.

Morphology of Si nanocrystallites embedded in SiO2 matrix

2008 ◽  
Vol 23 (11) ◽  
pp. 2990-2995 ◽  
Author(s):  
V.S. Teodorescu ◽  
M.L. Ciurea ◽  
V. Iancu ◽  
M-G. Blanchin
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Quartz Substrate ◽  
Stacking Faults ◽  
Film Properties ◽  
Sio2 Matrix ◽  
Transmission Electron ◽  
High Concentrations ◽  
Si Nanocrystallites

The nanostructure of Six(SiO2)1–x films deposited on quartz substrate, where x varies from 0 to 1, was determined by high-resolution transmission electron microscopy in the sample regions with x ≈ 0.1, 0.2, 0.5, and 0.75. In the Si0.5(SiO2)0.5 region, the formation of a Si nanocrystallite network was established. At high concentrations of Si nanocrystallites, nanotwins and stacking faults occurred in the crystallites. Large Si crystallites appeared at x ⩾ 0.5 in the quartz substrate under the interface, while the film presented nanopores over the interface. The mechanisms for the formation of the nanocrystallites were discussed and correlated with the film properties.

Phylogenetic Analysis and Searching Bovine Papillomaviruses in Teat Papillomatosis Cases in Cattle by Histopathological, Immunohistochemical and Transmission Electron Microscopy Methods

2021 ◽  
Author(s):  
Yakup Yildirim ◽  
Mehmet Kale ◽  
Özlem Özmen ◽  
Abdurrahman Anıl Çağırgan ◽  
Sibel Hasırcıoğlu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sequence Analysis ◽  
Molecular Diagnosis ◽  
Degenerate Primers ◽  
Specific Primers ◽  
Virus Particles ◽  
Transmission Electron ◽  
Genus One ◽  
Epithelium Cells

Abstract Papillomaviruses are epitheliotropic viruses causing proliferations in skin, mucosa and various internal organs in different animal species. Especially due to lesions it causes in teats of cattle, it leads to important economical losses in milk sector. In this study, the aim was to diagnose bovine papillomaviruses (BPVs) causing teat papillomas in cattle by immunohistochemical, transmission electron microscopy (TEM) and molecular methods and to detect the defect on tissues by the virus using histopathological method. In addition to this, sequence analysis of the isolated field strains were to be carried out and their genetic and phylogenetic closeness with the strains within the literature were to be detected. After confirming teat papillomatosis in the collected samples using histopathological and immunohistochemical methods, other diagnosis methods were then used. During the TEM examination of teat lesions, intranuclear virus particles were seen in epithelium cells. After carrying out PCR using degenerate primers and type specific primers, 7 samples were detected as positive for BPV and these samples were used for typing using sequence analysis/PCR with type-specific primers. Within these analysis, three out of seven BPV isolates we collected from infected teat tissues of different cattle were detected as BPV-6, two as BPV-10, one as BPV-2 and one as BPV-8. Five isolates we isolated during sequence analysis of positive samples were found in Xipapillomavirus 1 genus, one in Epsilonpapillomavirus 1 genus and another in Deltapapillomavirus genus. As a result, in molecular diagnosis of BPV that takes place in etiology of teat papillomas, using type specific primers proved to be useful following the usage of genotyping in molecular diagnosis of BPV and generate primers in characterization. Detecting BPV types and their prevalence, taking biosafety measures in animal breeding and giving importance to vaccine studies was considered essential.

scholarly journals Ion Channeling Analysis of Gallium Nitride Implanted with Deuterium

1999 ◽  
Vol 4 (S1) ◽  
pp. 403-404
Author(s):  
W. R. Wampler ◽  
S. M. Myers
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gallium Nitride ◽  
Basal Plane ◽  
Large Fraction ◽  
Stacking Faults ◽  
Ion Channeling ◽  
Transmission Electron ◽  
High Concentrations

Ion channeling and transmission electron microscopy were used to examine the microstructure of GaN implanted with deuterium (D) at high (>1 at. %) and low (< 0.1 at. %) D concentrations. At high concentrations, bubbles and basal-plane stacking faults were observed. Ion channeling showed the D was disordered relative to the GaN lattice, consistent with precipitation of D2 into bubbles. At low D concentrations, bubbles and stacking faults are absent and ion channeling shows that a large fraction of the D occupies sites near the center of the c-axis channel.

Techniques for Transmission Electron Microscopy of Fiber-Matrix Interfaces in Aluminum Alloy-Boron Composites by Ion Erosio

1971 ◽  
Vol 29 ◽  
pp. 204-205
Author(s):  
G. G. Shaw
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Electron Beam ◽  
Pure Aluminum ◽  
Ion Milling ◽  
Transmission Electron ◽  
Fiber Matrix ◽  
Ion Erosion ◽  
Row Of Fibers

The morphology and composition of the fiber-matrix interface can best be studied by transmission electron microscopy and electron diffraction. For some composites satisfactory samples can be prepared by electropolishing. For others such as aluminum alloy-boron composites ion erosion is necessary.When one wishes to examine a specimen with the electron beam perpendicular to the fiber, preparation is as follows: A 1/8 in. disk is cut from the sample with a cylindrical tool by spark machining. Thin slices, 5 mils thick, containing one row of fibers, are then, spark-machined from the disk. After spark machining, the slice is carefully polished with diamond paste until the row of fibers is exposed on each side, as shown in Figure 1.In the case where examination is desired with the electron beam parallel to the fiber, preparation is as follows: Experimental composites are usually 50 mils or less in thickness so an auxiliary holder is necessary during ion milling and for easy transfer to the electron microscope. This holder is pure aluminum sheet, 3 mils thick.

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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