The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The complementary capabilities of various characterisation methods for micro-structural assessment are demonstrated. The assessed structures were composed of unbleached microfibrillated cellulose (MFC) in combination with bleached and 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) pre-treated MFC materials. The biodegradable nano-composites were thus characterised in detail, including laser profilometry,...
The male reproductive system of Dolycoris baccarum (Linnaeus 1758) is studied morphologically and histologically using both light and scanning electron microscopes (SEM). The reproductive system of the male D. baccarum consists of a pair of testis, a pair of vas deferens, a pair of seminal vesicles, accessory glands (mesadenia, ectadenia), a bulbus ejaculatorius, a pair of ectodermal sacs, and a ductus...
A LEO SUPRA 35VP FESEM has been modified to significantly improve image quality in the low pressure mode of operation. It is further shown that the same conversion can allow the machine to operate also as a fully fledged environmental scanning electron microscope with specimen chamber pressures in excess of 2000Pa. This is achieved by a diamagnetic insert with a thin pressure limiting aperture at...
Full-length native rat amylin 1–37 has previously been widely shown to be unable to form fibrils and to lack the toxicity of the human amylin form leading to its use as a non-amyloidogenic control peptide. A recent study has suggested that rat amylin 1–37 forms amyloidogenic β-sheet structures in the presence of the human amylin form and suggested that this property could promote toxicity. Using TEM...
The Sb concentration in axial GaAs 1−x Sb x inserts of otherwise pure GaAs nanowires has been investigated with quantitative high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The Sb concentration was quantified by comparing the experimental image intensities normalized to the incident beam intensity with intensities simulated with a frozen lattice...
With a combination of cultivation and phase-contrast and fluorescence microscopic observation, we first found that fusion of extracellular vesicles with or without membranes occurred in fertilized chicken eggs. In order to find solid evidence for fusion, we collected many fusion data from various tissues; primo vessels and pancreases of mice and pancreases and omentums of rats. Especially, by using...
The determination of the viscoelastic properties of cells by atomic force microscopy (AFM) is mainly realized by looking at the relaxation of the force when a constant position of the AFM head is maintained or at the evolution of the indentation when a constant force is maintained. In both cases the analysis rests on the hypothesis that the motion of the probe before the relaxation step is realized...
Amorphous mineral granules are formed by concentric mineral layers containing polyphosphate, pyrophosphate and/or orthophosphate and several metallic cations such as Mg 2+ , Ca 2+ , K + , Mn 2+ , Fe 3+ , Cu 2+ , and Zn 2+ . In this work, we analyzed amorphous mineral granules isolated from the ant species Camponotus abdominalis, Camponotus sp...
A proper understanding of the behavior of gas flow in an environmental scanning electron microscope together with its interactions with the electron beam is important for work in this field. Further discussion on a figure of merit introduced recently is reported together with a critical review of some prior literature, with particular attention to issues found in error. A concise attempt is made to...
In this study, the morphology of spermatozoa of Bethylidae Dissomphalus connubialis (Pristocerinae) was analyzed using light and transmission electron microscopy. Spermatozoa of this species are thin, measure approximately 130μm in length and comprise a head region and flagellum region. The head is formed by the acrosome and nucleus. The acrosome consists of the acrosome vesicle and the perforatorium,...
The intershell spacing in different regions of a multi-walled carbon nanotube (MWCNT) was determined by analysis of high resolution transmission electron (HR-TEM) micrographs. Three general effects can be pointed out, (1) the regular intershell spacing of a CNT is bigger than that in a graphitic carbon because the curvature generates geometrical and electronic deformations which increase repulsion...
The low-loss region of the electron energy-loss spectrum, the valence EELS, provides information about the electronic structure and optical properties of materials. For bulk materials the spectral intensity can be directly connected to the complex dielectric function. Ab initio quantum mechanical calculations have an important role to play in the interpretation of the fine spectral detail and how...
A microstructural and mineralogical study shows the transition of aragonitic nacreous tablets to aragonitic prisms inside previously secreted nacre, i.e. without contact with the mantle or extrapallial fluid, in a field-collected mytilid bivalve Crenomytilus grayanus (D.). The intermediate zone between nacre and new prisms is represented by nacre tablets “stuck together” or by disordered calcium carbonate...
Surface cracking or heat-checking is investigated at a microscopic scale on a hot work tool steel (X38CrMoV5) tested under thermal fatigue. Thermal fatigue tests are periodically interrupted to observe the surface of the specimens by scanning electron microscopy (SEM). A non destructive and semi-automatic method is developed to assess and evaluate the two-dimensional crack pattern initiated on the...
A new approach has been initiated to improve the spatial lateral resolution of the X-ray microanalysis and the backscattered electrons modes in variable pressure or environmental scanning electron microscope (VP-ESEM). This approach is based on correlation between two concepts: the electron beam skirt radius in the gas (R S ) and the generation volume radius (R X ) of X-ray signals...
The recent emergence of the focused ion-beam (FIB) microscope as a dedicated specimen preparation tool for transmission electron microscopy (TEM) has extended the reach of TEM to a wider variety of problems in materials science. This paper highlights three examples of using FIB–SEM lift-out techniques for preparing site-specific and crystallographic orientation-specific thin-foil specimens. An in...
The possibilities of using a field emission scanning electron microscope (FESEM) equipped with an Autrata improved yttrium aluminum garnet (YAG) detector of back-scattered electrons (BSE) for a determination of metal nanoparticles sizes were examined in this study. The diameters of Au and Pd nanoparticles with different sizes were resolved based on digitally recorded FESEM micrographs and were compared...
The effects of ingested neem oil, a botanical insecticide obtained from the seeds of the neem tree, Azadirachta indica, on the midgut cells of predatory larvae Ceraeochrysa claveri were analyzed. C. claveri were fed on eggs of Diatraea saccharalis treated with neem oil at a concentration of 0.5%, 1% and 2% during throughout the larval period. Light and electron microscopy showed severe damages in...
The sensory organs on the antennae and maxillary plates of Zema gressitti Fennah (Hemiptera: Fulgoromorpha: Tropiduchidae) are studied using scanning electron microscopy. Four types of antennal sensilla are reported: trichoid sensilla on the antennal scape and antennal pedicel, plate organs on the antennal pedicel, campaniform sensilla on the antennal scape and antennal pedicel, and coeloconic sensilla...
Application of microwave energy for materials processing is emerging as an innovative technology with many advantages over the conventional processing, and the rapid progress in this field suggests that microwave material processing (e.g., microwave and microwave-hydrothermal process) will play an outstanding role in the broad field of nanoscience and nanotechnology. This review article gives an up-to-date...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.