CLINICAL AND MORPHOLOGICAL CHARACTERISTICS OF CHRONIC RECURRENT HEMATOGENOUS OSTEOMYELITIS

2020 ◽  
Vol 93 (1) ◽  
pp. 93-99
Author(s):  
Azamat Shamsiev ◽  
◽  
Sukhrob Zainiev ◽  
N. Alieva
Keyword(s):  
Electron Microscopy ◽  
Microbial Contamination ◽  
Morphological Characteristics ◽  
Medullary Canal ◽  
Pathological Changes ◽  
Morphological Studies ◽  
Hematogenous Osteomyelitis ◽  
Transmission Electron ◽  
Bone Fragments ◽  
Tubular Bones

The studied material of scanning and transmission electron microscopy were bone fragments of 40 patients obtained during surgery from various pathologically altered sections of the affected tubular bones. Morphological studies revealed microscopic foci of necrosis, leukocyte infiltrates and microabscesses both in the main focus and in other parts of the bone marrow canal. Microabscesses detected by microscopy represent the morphological basis of chronic hematogenous osteomyelitis, can be located at a considerable distance from the main necrotic purulent focus and, under appropriate conditions, cause a relapse of the disease. Morphological studies have shown that surgical debridement of the lesion with ultrasonic cavitation of the lesion and the medullary canal contributes to a significant reduction in the degree of microbial contamination, followed by a decrease in pathological changes in bone tissue.

Morphological studies of linear (AB)n multiblock copolymers and their blends

1992 ◽  
Vol 50 (1) ◽  
pp. 384-385
Author(s):  
Richard J. Spontak ◽  
Steven D. Smith ◽  
Arman Ashraf
Keyword(s):  
Electron Microscopy ◽  
Microphase Separation ◽  
Multiblock Copolymers ◽  
First Order ◽  
Morphological Studies ◽  
Transmission Electron ◽  
First Order Phase Transition ◽  
Covalently Bonded ◽  
Total Molecular Weight ◽  
First Order Phase

Block copolymers are composed of sequences of dissimilar chemical moieties covalently bonded together. If the block lengths of each component are sufficiently long and the blocks are thermodynamically incompatible, these materials are capable of undergoing microphase separation, a weak first-order phase transition which results in the formation of an ordered microstructural network. Most efforts designed to elucidate the phase and configurational behavior in these copolymers have focused on the simple AB and ABA designs. Few studies have thus far targeted the perfectly-alternating multiblock (AB)n architecture. In this work, two series of neat (AB)n copolymers have been synthesized from styrene and isoprene monomers at a composition of 50 wt% polystyrene (PS). In Set I, the total molecular weight is held constant while the number of AB block pairs (n) is increased from one to four (which results in shorter blocks). Set II consists of materials in which the block lengths are held constant and n is varied again from one to four (which results in longer chains). Transmission electron microscopy (TEM) has been employed here to investigate the morphologies and phase behavior of these materials and their blends.

scholarly journals Glittering ZnO/Ag/MnO Nano Superstructures for Photocatalytic Applications

2020 ◽  
Vol 32 (10) ◽  
pp. 2453-2459
Author(s):  
J.P. Shubha ◽  
S. Shwetha Priyadharshini ◽  
S. Jayadev
Keyword(s):  
Electron Microscopy ◽  
Cost Effective ◽  
Zinc Nitrate ◽  
Ion Concentration ◽  
Manganese Acetate ◽  
Blue Dye ◽  
Hydrogen Ion Concentration ◽  
Morphological Studies ◽  
Transmission Electron ◽  
Green Route

ZnO/Ag/MnO ternary heterostructure nanomaterials have been synthesized via cost effective green route using zinc nitrate, manganese acetate and silver nitrate as oxidizers and perished curd as a fuel. The obtained ZnO/Ag/MnO nanomaterials are analyzed using Powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), morphological studies by scanning electron microscopy (FESEM), internal structure by transmission electron microscopy (TEM). Both PXRD and FESEM techniques were used to confirm the formation of particles and flakes composition of ZnO/Ag/MnO nanomaterials. Photocatalytic activity of ZnO/Ag/MnO was assessed by varying light source, hydrogen ion concentration, amount of catalyst and amount of dye. The ZnO/Ag/MnO nanoparticles exhibited an enhanced photodegradation of methylene blue dye under visible light.

Effect of Additive Constraint on the Morphological and Mechanical Properties of Triblock Copolymer Blends

1996 ◽  
Vol 461 ◽  
Author(s):  
L. Kane ◽  
D. A. Norman ◽  
S. A. White ◽  
R. J. Spontak
Keyword(s):  
Electron Microscopy ◽  
Diblock Copolymer ◽  
Triblock Copolymer ◽  
Morphological Characteristics ◽  
Mechanical Analysis ◽  
Molecular Weights ◽  
Copolymer Blends ◽  
Transmission Electron ◽  
Copolymer Blend

ABSTRACTWhile numerous studies have addressed the morphological characteristics of diblock copolymer blends either with a second copolymer or a parent homopolymer, relatively few have examined comparable blends containing a triblock copolymer. In this study, we investigate the role of mid-block bridging on the morphological and physical characteristics of blends composed of a poly(styrene-b-isoprene-b-styrene) (SIS) triblock copolymer with either an unconstrained homo-polyisoprene (hI) or an end-grafted SI diblock copolymer. Blend compositions and molecular weights of the hi, as well as the I-block of the copolymer, have all been systematically varied to elucidate the effect of additive constraint on the extent of nonideal intramicrodomain mixing. Blend morphologies are characterized using transmission electron microscopy, while blend properties have been measured by dynamic mechanical analysis.

Isolation and Ultrastructure of Aleurone Cell Walls From Wheat and Barley

1981 ◽  
Vol 8 (5) ◽  
pp. 453 ◽  
Author(s):  
A Bacic ◽  
BA Stone
Keyword(s):  
Electron Microscopy ◽  
Cell Walls ◽  
Morphological Characteristics ◽  
Triticum Aestivum L ◽  
Whole Grains ◽  
Starchy Endosperm ◽  
Hordeum Vulgare L ◽  
Air Classification ◽  
Transmission Electron ◽  
Bilayered Structure

Aleurone layers and cell walls from both wheat (Triticum aestivum L. cv. Insignia) and barley (Hordeum vulgare L. cv. Clipper) have been isoIated by differential centrifugation in benzene-carbon tetrachloride mixtures and by air classification. The isolated walls were obtained in sufficient quantities and purity for comprehensive chemical analysis. Morphological characteristics of the isolated aleurone layers and walls were examined by bright field, fluorescence and scanning electron microscopy and compared with their appearance in whole grains. Transmission electron microscopy of wall sections clearly showed their characteristic bilayered structure. Aniline blue-positive deposits were observed at the aleurone-starchy endosperm interfaces of both wheat and barley.

scholarly journals Manganese ferrite graphene nanocomposite synthesis and the investigation of its antibacterial properties for water treatment purposes

2020 ◽  
Vol 15 (4) ◽  
pp. 1
Author(s):  
Lara De Souza Soletti ◽  
Maria Eliana Camargo Ferreira ◽  
Alex Toshio Kassada ◽  
Benício Alves de Abreu Filho ◽  
Rosangela Bergamasco ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antibacterial Activity ◽  
Water Treatment ◽  
Graphene Nanosheets ◽  
Antibacterial Properties ◽  
Morphological Characteristics ◽  
Manganese Ferrite ◽  
Transmission Electron ◽  
Cutting Effect ◽  
Mnfe2o4 Nanoparticles

The main objective of this study was to synthesize a nanocomposite using graphene and manganese ferrite nanoparticles (MnFe2O4-G) and to evaluate its antibacterial activity for water treatment purposes. Its morphological characteristics were evaluated by instrumental techniques, such as scanning electron microscopy and transmission electron microscopy. The characterization results indicated that the nanocomposite presented nanoparticles of approximately 25 nm well dispersed in transparent and large (14 μm) graphene nanosheets. The antibacterial activity was evaluated in a batch experiment using a concentration of 40 μg mL-1 of nanocomposite (MnFe2O4-G, bare MnFe2O4 nanoparticles or graphene oxide), 1x105 CFU mL-1 of Escherichia coli, and 8 h of contact time at room temperature. The highest antibacterial capacity was observed for the hybrid nanocomposite (91.91%), due to the synergic effect of graphene and MnFe2O4 nanoparticles. Various mechanisms were proposed to explain the effective antibacterial activity of MnFe2O4-G, such as wrapping, oxidative stress, sharp-edge cutting effect, among others. The results showed that MnFe2O4-G is a potential alternative in water treatment processes as an antibacterial agent.

scholarly journals Morphological aspects of cell reabsorption in laying queens and workers of Apis mellifera (Hymenoptera, Apidae)

2008 ◽  
Vol 98 (4) ◽  
pp. 421-424 ◽  
Author(s):  
Karina Patrício ◽  
Carminda da Cruz-Landim
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Apis Mellifera ◽  
Environmental Factors ◽  
Developmental Stage ◽  
Oocyte Maturation ◽  
Morphological Characteristics ◽  
Follicular Cells ◽  
Morphological Aspects ◽  
Transmission Electron

The occurrence of cell reabsorption in the ovaries of queens in several rates of laying eggs, artificially impeded of laying, and in nurse workers, of Apis mellifera (Linnaeus, 1758), was studied with light (LM) and transmission electron microscopy (TEM). Two types of structures were described and named by analogy with vertebrates ovarian structures, as corpus luteus, when resulting from the reabsorption of the follicular cells after ovulation, and corpus atresicus when resulting from total follicular reabsorption at any oocyte developmental stage. These structures have the same morphological characteristics and physiological signification in both castes. The corpus luteus occurrence indicates ovulation and its number is correspondent to the queen's rates of oviposition. The presence of this structure in nurse workers ovarioles shows that this caste may lay eggs. The incidence of corpus atresicus in queens decay with the increasing of the oviposition indicating that the inhibition of the normal sequence of oocyte maturation in the ovaries is deleterious. Both, corpus luteus and corpus atresicus incidence may be influenced by environmental factors.

scholarly journals Zeolite-Assisted Shear Exfoliation of Graphite into Few-Layer Graphene

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 377 ◽  
Author(s):  
Gabriela Tubon Usca ◽  
Cristian Vacacela Gomez ◽  
Marco Guevara ◽  
Talia Tene ◽  
Jorge Hernandez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
Great Promise ◽  
Layer Graphene ◽  
Morphological Studies ◽  
Transmission Electron ◽  
Potential Applications ◽  
Novel Method ◽  
Inorganic Layered Materials ◽  
Few Layer Graphene

A novel method is presented to prepare few-layer graphene (FLG) in N-methyl-2-pyrrolidinone (NMP) by using a simple, low-cost and energy-effective shear exfoliation assisted by zeolite and using a cappuccino mixer to produce shear. We propose that the exfoliation of natural graphite flakes can be achieved using inelastic collisions between graphite flakes and zeolite particles in a dynamic colloidal fluid. To confirm the exfoliation of FLG, spectroscopy and morphological studies are carried out using Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Additionally, the obtained graphene shows a linear flow of current and low resistance. The proposed method shows great promise for the industrial-scale synthesis of high-quality graphene with potential applications in future graphene-based devices, and furthermore, this method can be extended to exfoliate inorganic layered materials such as BN and MoS2.

Morphological studies on renewable castor oil-based nanocomposites with modified clay and MWCNTs as fillers

2020 ◽  
pp. 096739112093524
Author(s):  
Anupama Mogha ◽  
Anupama Kaushik
Keyword(s):  
Electron Microscopy ◽  
Castor Oil ◽  
Chemical Structure ◽  
Morphological Analysis ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Morphological Studies ◽  
Transmission Electron ◽  
Commercial Applications

This research presents an analysis of castor oil-based polymer nanocomposites that can be used for numerous commercial applications. Due to the versatile chemical structure of castor oil, it can replace the petrochemical products and hence can be optimized as nontoxic bioresource for the production of nanocomposites with the incorporation of nanofillers in small quantities. It can be directly used as polyol resource without any chemical alteration for synthesis of polyurethane (PU) nanocomposites. The prepared PU nanocomposites were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, wide angle X-ray diffraction, transmission electron microscopy (TEM), and mechanical properties. The compositional and structural studies indicate the formation of PU linkages and well dispersion of clay and multiwalled carbon nanotubes between the polymer–nanofiller phase, as shown by the morphological analysis using TEM. Also, there is an increase in the tensile strength and Young’s modulus values with the increase in the filler content.

scholarly journals Morphological characteristics and cell viability of coffee plants calli

2014 ◽  
Vol 44 (4) ◽  
pp. 660-665 ◽  
Author(s):  
Marlúcia Souza Pádua ◽  
Luciano Vilela Paiva ◽  
Luciano Coutinho da Silva ◽  
Kalynka Gabriella do Livramento ◽  
Eduardo Alves ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cell Viability ◽  
Coffea Arabica ◽  
Morphological Characteristics ◽  
Leaf Explants ◽  
Transmission Electron ◽  
Different Types ◽  
Coffee Plants ◽  
Cytoplasm Vacuolization

The aim of this research was to characterize and compare two types of calli from leaf explants of Coffea arabica (cultivar Catiguá). Cells of different types of callus were successfully characterized regarding viability and internal and external morphological characteristics. It was obtained two morphologically distinct types of callus: (i) yellow friable and (ii) transparent watery. The yellow friable calli showed higher cell viability and embryogenic characteristics. Scanning and transmission electron microscopy showed embryogenic characteristics in cells of the yellow friable calli evidenced by the presence of small and isodiametric cells, while transparent watery calli showed elongated cells and large cytoplasm vacuolization.

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