Morphological analysis of structural features of equipment for semidry pressing

Refractories ◽  
1995 ◽  
Vol 36 (10) ◽  
pp. 327-330
Author(s):  
V. E. Vernikovskii
Keyword(s):  
Morphological Analysis ◽  
Structural Features ◽  
Semidry Pressing

Comparison of Morphological Similarities and Differences between Liquid-Based Cytology and Conventional Techniques of Serous Effusion Cytology Specimens

2021 ◽  
pp. 1-6
Author(s):  
Nurhan Baykus ◽  
Selver Özekinci ◽  
Zeynep Betul Erdem ◽  
Eren Vurgun ◽  
Fetin Rustu Yildiz
Keyword(s):  
Morphological Analysis ◽  
Kappa Statistic ◽  
Structural Features ◽  
Conventional Technique ◽  
Serous Effusion ◽  
Significant Difference ◽  
Microscopic Feature ◽  
Liquid Based Cytology ◽  
The Relationship ◽  
Level Of Agreement

<b><i>Introduction:</i></b> The aim of this study is to discover a fast and efficient method for the diagnosis of serous effusion cytology specimens by comparing the cytomorphological features of SurePath (SP) smears and smears prepared by cytospin. After the macroscopic features of the incoming material were recorded, it was divided into 2 for conventional technique (CT) and liquid-based technique. Cytospin was used for CT and SurePath for liquid-based technique in this study. <b><i>Materials and Methods:</i></b> 243 serous effusions (33 thoracentesis and 92 paracentesis fluids, 118 peritoneal lavage fluids) were investigated. After shaking the effusion gently, it was centrifuged for 5 min at 1,250 rpm for cytospin smear. SP smear was prepared according to the “BD PrepStain slide processor”. Two smears were prepared with these 2 methods and then stained with Papanicolaou. The smears were examined under a light microscope in terms of fixation, background, cellularity, nucleus, and structural features. All statistical analysis of the data was performed using the SPSS 17.0 software. For each microscopic feature, the χ<sup>2</sup> test was used to assess the significance of the relationship between cytospin and SP, and level of agreement in between the methods was assessed using the kappa statistic. <b><i>Results:</i></b> A statistically significant difference was observed between the 2 methods in background (<i>p</i> &#x3c; 0.001), cellularity (<i>p</i> &#x3c; 0.001), nucleus features (<i>p</i> &#x3c; 0.001), and structural features (<i>p</i> &#x3c; 0.05). There was no significant difference in fixation. Low level of agreement was observed with the kappa statistic in fixation, background, and cellularity. Moderate level of agreement was observed in the nucleus and structural feature groups with the kappa statistic. <b><i>Discussion/Conclusion:</i></b> Although there are advantages of liquid-based technique such as standardized fixation and cleaner background, since the cellular and background components required for morphological analysis and diagnosis are better preserved in cytospin, it is considered to be better to use liquid-based technique not alone but together with CT.

scholarly journals Preparation and Characterization of Multifunctional Chitin/Lignin Materials

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Łukasz Klapiszewski ◽  
Marcin Wysokowski ◽  
Izabela Majchrzak ◽  
Tomasz Szatkowski ◽  
Magdalena Nowacka ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Electrochemical Sensors ◽  
Structural Features ◽  
Aqueous Dispersions ◽  
Multifunctional Material ◽  
Wide Range ◽  
Ft Ir ◽  
Polymer Fillers ◽  
Thermal Stability Of

Multifunctional chitin/lignin materials were synthesized. In order to combine mechanical milling of the biopolymers with simultaneous mixing, a centrifugal ball mill was utilized. The resulting materials, differing in terms of the proportions of precursors used, underwent detailed physicochemical and dispersive-morphological analysis. On the basis of FT-IR spectra and results of elemental analysis, the efficiency of the preparation of the materials was determined. The influence of the precursors on the thermal stability of the resulting systems was also evaluated. Zeta potential was determined as a function of pH to describe the electrokinetic stability of aqueous dispersions. This is important for evaluating the utility of the materials and indirectly confirms the effectiveness of the proposed method of synthesis of chitin/lignin products. Measurements were performed to determine basic colorimetric parameters, crucial in the production technology of multiple colored materials. It is expected that chitin/lignin materials will find a wide range of applications (biosorbents, polymer fillers, and electrochemical sensors), as they combine the unique properties of chitin with the specific structural features of lignin to provide a multifunctional material.

Morphological analysis of pork assessment

2020 ◽  
Vol 1 ◽  
pp. 80-87
Author(s):  
A. Smirnov ◽  
◽  
V. Urban ◽  
Keyword(s):  
Morphological Analysis ◽  
Muscle Fibers ◽  
Microstructural Analysis ◽  
Thermal Conditions ◽  
Longitudinal Section ◽  
Video Camera ◽  
Structural Features ◽  
Histological Techniques ◽  
Raw Meat

The article presents a morphological analysis of different thermal conditions of pork at the cellular level. The purpose of the study is to develop and improve classical histological techniques and methods for as-sessing the quality of raw meat to determine falsification. And to creat scientifically based methodology of scientific and practi-cal value. The objects of research were raw meat materials - pork with different thermal conditions: chilled, frozen, thawed. As a control, we used histological preparations of fresh pork meat, made by the classical meth-od according to GOST 19496-2013. The studies were carried out in accordance with the classical microstructural analysis and with standardized methods, in the author's modification. The author’s modification of the method allowed to reduce the time for preparing sections for research and to exclude expen-sive equipment for the preparation of histo-logical sections. Microscopy of sections was carried out using a MicroOptix MX 300 (T) light microscope (West Medica, Austria). Photography of the preparations was carried out using a CAM® V1200 (C) HD video camera (West Medica, Austria). The microstructure of meat undergoes changes in the process of autolysis. Micro-scopic analysis clearly reveals the general structural features of the studied muscles of chilled and thawed meat, as well as differ-ences in their internal structure. The thick-ness of the muscle fibers of different mus-cles is various. The corrugated or folded shape of many muscle fibers of the cooled meat is clearly visible in all muscles on the longitudinal section. Corrugated fibers have a slight contraction or are completely loose, and at the same time the adjacent straight fibers are strongly reduced. They cause fold-ing in neighboring relaxed fibers. It was found that corrugation and folding are unstable, they almost completely disap-pears in chilled meat. This is one of the mor-phological features that can be well observed with a magnification of 10 × 40 microscope and can be evaluate the quality of meat by the degree of maturation: fresh or chilled. The obtained data indicate that the gen-eral appearance of muscle fibers noticeably changes during freezing - the transverse striation can appear worse, undetected and sometimes it can disappears. All fibers be-come thinner after freezing. Significant changes occur in the nuclei of cells. In thawed meat, they become smaller and thinner, chromatin is visible as a contin-uous mass with a pycnotic nature. Chromatin coagulates into a continuous, highly stained mass. The nuclei change their shape and they can be looked like a dark elongated oval shape of a homogeneous mass. The use of histological and microscopic methods for studying comparative changes in fresh, chilled and thawed meat can con-tribute to the accuracy and improvement of methods for detecting thawed meat that can be used during falsification of chilled meat, as well as it allows to study processing and storage conditions for chilled meat.

scholarly journals ХУДОЖНЬО-КОМПОЗИЦІЙНІ ХАРАКТЕРИСТИКИ МОДЕЛЕЙ КОЛЕКЦІЇ ЖІНОЧОГО ОДЯГУ В СТИЛІ МІЛІТАРІ

2019 ◽  
pp. 117-126
Author(s):  
Т. В. Луцкер ◽  
М. С. Винничук ◽  
О. В. Колосніченко ◽  
О. О. Піддубна ◽  
М. А. Лазарчук
Keyword(s):  
Morphological Analysis ◽  
Structural Features ◽  
Constructive Method ◽  
Design Features ◽  
Graphical Editor ◽  
Women's Clothing ◽  
Color Combinations ◽  
The Military ◽  
Modern Technologies

Study of the artistic design features of the models of the creative collection of modern women's clothing using military style. Development of compositional and harmonious and constructive-technological solutions for products of the author's collection. To achieve this goal, a system-structural, morphological analysis, a compositional-constructive method of research are applied. Sketches are made using the Xara X graphical editor. The evolution of the form, color combinations and the structure of the decoration of products in military style has been studied. Artistic and compositional and structural features of the collection of modern women's clothing in military style, taking into account modern technologies and materials, are defined and characterized. The structural, texture and plastic characteristics of the costume in the military style are analyzed, the characteristics characteristic of the style are highlighted and introduced into the articles of the collection.

Electron microscopy and diffraction studies of polyimides

1983 ◽  
Vol 41 ◽  
pp. 28-29
Author(s):  
O.C. de Hodgins ◽  
K. R. Lawless ◽  
R. Anderson
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Structural Features ◽  
Inert Atmosphere ◽  
Polyimide Films ◽  
Resolution Electron ◽  
The Matrix ◽  
High Resolution Electron Microscope ◽  
Diffraction Patterns ◽  
Polymeric Samples

Commercial polyimide films have shown to be homogeneous on a scale of 5 to 200 nm. The observation of Skybond (SKB) 705 and PI5878 was carried out by using a Philips 400, 120 KeV STEM. The objective was to elucidate the structural features of the polymeric samples. The specimens were spun and cured at stepped temperatures in an inert atmosphere and cooled slowly for eight hours. TEM micrographs showed heterogeneities (or nodular structures) generally on a scale of 100 nm for PI5878 and approximately 40 nm for SKB 705, present in large volume fractions of both specimens. See Figures 1 and 2. It is possible that the nodulus observed may be associated with surface effects and the structure of the polymers be regarded as random amorphous arrays. Diffraction patterns of the matrix and the nodular areas showed different amorphous ring patterns in both materials. The specimens were viewed in both bright and dark fields using a high resolution electron microscope which provided magnifications of 100,000X or more on the photographic plates if desired.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Study of the Molecular Architecture of Keratin Filaments by Electron Microscopy

1982 ◽  
Vol 40 ◽  
pp. 118-119
Author(s):  
U. Aebi ◽  
P. Rew ◽  
T.-T. Sun
Keyword(s):  
Electron Microscopy ◽  
Structural Organization ◽  
Cell Types ◽  
Structural Features ◽  
Molecular Architecture ◽  
The Past ◽  
Keratin Filaments ◽  
Different Types ◽  
10 Nm Filaments ◽  
Different Cell Types

Various types of intermediate-sized (10-nm) filaments have been found and described in many different cell types during the past few years. Despite the differences in the chemical composition among the different types of filaments, they all yield common structural features: they are usually up to several microns long and have a diameter of 7 to 10 nm; there is evidence that they are made of several 2 to 3.5 nm wide protofilaments which are helically wound around each other; the secondary structure of the polypeptides constituting the filaments is rich in ∞-helix. However a detailed description of their structural organization is lacking to date.

Measurement and Reduction of Radiation Damage in Frozen Hydrated Crystalline Specimens

1978 ◽  
Vol 36 (3) ◽  
pp. 70-77 ◽  
Author(s):  
R.M. Glaeser ◽  
S.B. Hayward
Keyword(s):  
Diffraction Pattern ◽  
Structural Information ◽  
Structural Disorder ◽  
Structural Features ◽  
Biological Macromolecules ◽  
Diffraction Intensity ◽  
Object Structure ◽  
Specimen Material ◽  
Unit Cells ◽  
Identical Unit

Highly ordered or crystalline biological macromolecules become severely damaged and structurally disordered after a brief electron exposure. Evidence that damage and structural disorder are occurring is clearly given by the fading and eventual disappearance of the specimen's electron diffraction pattern. The fading and disappearance of sharp diffraction spots implies a corresponding disappearance of periodic structural features in the specimen. By the same token, there is a oneto- one correspondence between the disappearance of the crystalline diffraction pattern and the disappearance of reproducible structural information that can be observed in the images of identical unit cells of the object structure. The electron exposures that result in a significant decrease in the diffraction intensity will depend somewhat upon the resolution (Bragg spacing) involved, and can vary considerably with the chemical makeup and composition of the specimen material.

Some Structural Features of Metaphase Chromosomes of Mice and Men

1967 ◽  
Vol 25 ◽  
pp. 190-191
Author(s):  
Godfrey C. Hoskins ◽  
Betty B. Hoskins
Keyword(s):  
Electron Microscopy ◽  
Electron Micrographs ◽  
Structural Features ◽  
Metaphase Chromosomes ◽  
The Future ◽  
Of Mice And Men ◽  
Mouse Cells ◽  
Human And Mouse

Metaphase chromosomes from human and mouse cells in vitro are isolated by micrurgy, fixed, and placed on grids for electron microscopy. Interpretations of electron micrographs by current methods indicate the following structural features.Chromosomal spindle fibrils about 200Å thick form fascicles about 600Å thick, wrapped by dense spiraling fibrils (DSF) less than 100Å thick as they near the kinomere. Such a fascicle joins the future daughter kinomere of each metaphase chromatid with those of adjacent non-homologous chromatids to either side. Thus, four fascicles (SF, 1-4) attach to each metaphase kinomere (K). It is thought that fascicles extend from the kinomere poleward, fray out to let chromosomal fibrils act as traction fibrils against polar fibrils, then regroup to join the adjacent kinomere.

Observations on the Structure of Ta2O5

1972 ◽  
Vol 30 ◽  
pp. 540-541
Author(s):  
P. S. Kotval ◽  
C. J. Dewit
Keyword(s):  
Electron Microscope ◽  
Structural Features ◽  
Amorphous Structure ◽  
Polished Surface ◽  
Distilled Water ◽  
Anodic Films ◽  
Amorphous Films ◽  
Beam Heating ◽  
Diffraction Patterns ◽  
Hexagonal Arrays

The structure of Ta2O5 has been described in the literature in several different crystallographic forms with varying unit cell lattice parameters. Earlier studies on films of Ta2O5 produced by anodization of tantalum have revealed structural features which are not consistent with the parameters of “bulk” Ta2O5 crystalsFilms of Ta2O5 were prepared by anodizing a well-polished surface of pure tantalum sheet. The anodic films were floated off in distilled water, collected on grids, dried and directly examined in the electron microscope. In all cases the films were found to exhibit diffraction patterns representative of an amorphous structure. Using beam heating in the electron microscope, recrystallization of the amorphous films can be accomplished as shown in Fig. 1. As suggested by earlier work, the recrystallized regions exhibit diffraction patterns which consist of hexagonal arrays of main spots together with subsidiary rows of super lattice spots which develop as recrystallization progresses (Figs. 2a and b).

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