Vascular-tissue relations in the lungs in experimental superinvasive opisthorchiasis

2021 ◽  
Author(s):  
M.S. Shvedsky ◽  
G.S. Solovyov ◽  
V.V. Matvienko ◽  
V.A. Shidin ◽  
O.G. Solovyova ◽  
...  
Keyword(s):  
Key Words ◽  
Structural Changes ◽  
Vascular Tissue ◽  
Interstitial Tissue ◽  
Late Period ◽  
Epithelial Proliferation ◽  
Initial Stage

Structural changes in the lungs in superinvasive opisthorchiasis at various stages of invasion were studied. The morphology of permanent epithelial proliferation at the initial stage and their decrease in the late period were revealed. With the formation of granulomas in the interstitial tissue of the respiratory organs, with changes in the chronic period towards the formation of sclerotic foci. Key words: superinvasive opisthorchiasis (CO), metacercariae, acinus, terminal bronchioles (TB), cell infiltrates, pneumocytes.

Conversaziones 1974

1975 ◽  
Vol 29 (2) ◽  
pp. 163-171
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
Cell Walls ◽  
Structural Changes ◽  
Vascular Tissue ◽  
Root Systems ◽  
Plant Roots ◽  
Tracer Studies ◽  
Water Move ◽  
Intact Root

CONVERSAZIONES were held this year on 9 May and 27 June. At the first conversazione twenty-seven exhibits and two films were shown. The fine structure of plant roots in relation to transport of nutrient ions and water was demonstrated by Dr D. T. Clarkson of the A.R.C. Letcombe Laboratory, Wantage and Dr A. W. Robards of the Department of Biology, University of York. Two major pathways by which nutrients and water move radially across the cortex towards the central vascular tissue have been distinguished by the use of tracer studies of adsorption by different zones of intact root systems, microautoradiography and electron microscopy. Movement can be apoplastic through cell walls, or symplastic between cells joined by plasmodesmata. As the root ages, structural changes in the endodermis reduce movement in the former pathway but the symplast is not interrupted by the elaboration of endodermal walls because plasmodesmatal connexions remain intact. These observations help explain the contrasting extent to which different ions and water reach the shoot from young and mature parts of root systems.

Pertes de charge des ancrages actifs injectés dans un massif rocheux

1989 ◽  
Vol 16 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Brahim Benmokrane ◽  
Gérard Ballivy
Keyword(s):  
Epoxy Resin ◽  
Field Study ◽  
Key Words ◽  
Solid Rock ◽  
Rapid Loss ◽  
Prestress Loss ◽  
Massif Rocheux ◽  
Second Stage ◽  
Initial Stage

Estimation of loss of prestress is an essential part of the design of permanent or temporary prstressed anchors since stability of the retained structure must not be compromised. Findings of a field study on long-term behaviour of prestressed anchors are presented herein: different lengths of anchors in solid rock were injected with cement grout or epoxy resin. Load variation in the anchors with time indicated two distinct stages of loss of prestress: an initial stage of rapid loss of prestress and a second stage of very minor and uniform loss ending about 6 months after prestressing. Our study also showed that restressing anchors after a period of time reduces subsequent prestress loss and that overdimensioning of the injected length does not. Key words: rock, prestressed injected anchor, grout, loss of prestress, creep, relaxation.

scholarly journals IN VITRO DEGRADATION OF POLYDIOXANONE (PDO) LIFTING THREADS IN HYALURONIC ACID (HA).

2019 ◽  
Vol 10 (1) ◽  
pp. 1-13
Author(s):  
Dubraska Suárez ◽  
Gladys J Velazco de Maldonado ◽  
Reynaldo Ortiz ◽  
Victor Garcia-Guevara ◽  
Blanca Miller-Kobisher
Keyword(s):  
Hyaluronic Acid ◽  
Key Words ◽  
Structural Changes ◽  
Hydrolytic Degradation ◽  
Central Core ◽  
In Vitro Degradation ◽  
Central Column ◽  
Rate Of Hydrolysis

Background: Recently, some clinicians have proposed implanting PDO threads imbibed in hyaluronic acid (HA). However, this is controversial since PDO sutures are hydrophilic and the presence of HA could increase the rate of hydrolysis. Aim: To demonstrate the degradation of PDO lifting threads in HA through ultramicroscopy. Materials and methods: Three, one cm long, segments of 23G PDO threads, where immersed in 1.5 ml non-crosslinked hyaluronic acid in previously labeled, sterile microcentrifuge tubes. These were observed by ultramicroscopy at 4x and 10x after 24, 48 and 72 hours. Results: Microphotographs taken after 24 hours already show structural changes in the fibers, presenting an increase in interlaminar spaces and dilution of violet pigmentation. At 48 hours, degradation continues. PDO hygroscopy is observed as aqueous content between the peripheral layers and the central core of the thread. Some fibers show breakage, and there is an increase in interlaminar and interfibrillar spaces. At 72 hours, as the pigment is released, larger empty spaces are observed in the central column of the thread, and there is disorganization of the peripheral fibrils with fraying all along the fiber. Conclusions: Hyaluronic acid induces rapid biodegradation of the PDO thread by hydrolysis beginning 24 hours after contact of the thread with the biomaterial. We hypothesize that non-crosslinked hyaluronic acid is a powerful catalyzing agent for hydrolytic degradation of the PDO thread, since this thread is highly hydrophilic. Thus, we suggest that clinically embedding PDO threads with HA will only accelerate biodegradation of the suture. Key words: Lifting threads, polydioxanone, hyaluronic acid, biodegradation, PDO hydrolysis

scholarly journals New Industrialization: Phases, Dominants and Patterns

2020 ◽  
pp. 291-307
Author(s):  
Yuliya V. Razvadovskaya ◽  
Keyword(s):  
Structural Changes ◽  
New Technologies ◽  
Technological Development ◽  
Economic Transformation ◽  
Time Interval ◽  
Control Effect ◽  
Technological Basis ◽  
Initial Stage ◽  
Effective Development ◽  
New Industrialization

The article attempts to identify the key parameters of new industrialization, scientifically substantiate the place of such components as digitalization, cooperation, and the role of the public sector in economic transformation. An attempt is made to formulate the main theses of the concept of phase, which makes it possible to establish not only the divisibility of the process of new industrialization, but also to identify the main economic characteristics in the form of dominants, determinants and patterns for each phase of neoindustrial transformations. It is noted that, in most of the existing studies, new industrialization itself acts as one of the phases of economic development, along with such phases as industrialization, deindustrialization and reindustrialization. Each of these phases has a corresponding time interval and corresponding key parameters that allow identifying the main processes and results of passing the phase. Moreover, each of these phases also obeys the laws of phase behavior and, accordingly, can be divided into certain phases. The article considers new industrialization as a fourphase process. In view of the fact that new industrialization is a process that includes both the goals of modernization and the goals of innovative development, and thus assumes that there is a lag behind the basic technological development of the potential of the industry, the first phase of the process is the initiation of new industrialization, which implies a control effect on the process. Increasing the productivity of capital and labor in the system of new industrialization presupposes the active use of new technologies and knowledge, the increasing of efficiency through the widespread involvement of technological innovations in the economic circulation, as well as structural changes and the use of new combinations of resources. Digitalization at the initial stage of new industrialization can be viewed as a digital transformation, which leads to the formation of a new technological basis for production. At the stage of the full deployment of new industrialization, digitalization is a determinant that ensures the effective development of neoindustrial transformations. At the initial stage of new industrialization, the form of ownership of industrial resources is considered as a key dominant. The author concludes that key parameters such as digitalization, cooperation and the form of ownership at various phases of new industrialization can act as both determining and influencing factors, and under certain conditions become process patterns.

scholarly journals La angustia, principio de posibilidad del conocimiento

2016 ◽  
Vol 1 (1) ◽  
pp. 30
Author(s):  
Carlos Fernando Álvarez-González
Keyword(s):  
Key Words ◽  
Structural Changes ◽  
Production Of Knowledge ◽  
The Moment ◽  
The Individual

ResumenEl presente artículo de reflexión pretende examinar y desarrollar el concepto de la Angustia –principalmente en Kierkegaard- como principio de posibilidad en la producción de conocimiento. El filósofo a trabajar define la angustia como el temor venido de la nada. La aproximación a dicho concepto se realizó a partir del desarrollo de las categorías de falta, remordimiento, arrepentimiento, libertad y culpa. La investigación facilita comprender el momento de elección del individuo al conocer, lo que puede llevar a cambios estructurales en su representación acerca de cómo se aborda el papel de la misma en la producción del conocimiento desde la culpa. Palabras Claves: Angustia, falta, libertad, culpa, conocimiento. AbstractThe present reflection article tries to examine and develop the concept of the Anguish - mainly in Kierkegaard – as a principle of possibility in the production of knowledge. The philosopher to work defines the anguish as the fear that comes from nothing. The approach to this concept was made from the development of the categories of lack, remorse, repentance, freedom and guilt. Research facilitates to understand the moment of choice of the individual upon knowing, which can lead to structural changes in their representation about how the role of the same in the production of knowledge from guilt is addressed. Research makes it easier to understand the moment of choice of the individual when it is known, which can lead to structural changes in their representation about how the role of the same in the production of knowledge from guilt is addressed. Key words: Anguish, knowledge, guilt,  lack, freedom Resumo Este artigo de reflexãotem por objetivo analisar  e desenvolver o conceito da Aflição -principalmente em Kierkegaard – como princípio de possibilidade na produção de conhecimento. O  filósofo define a aflição como o medo vindo do nada. A abordagem a este conceito foi baseado no desenvolvimento das categorias de fracasso, remorso, arrependimento, liberdade e culpa. A pesquisa facilita a compreensão do momento de escolha do indivíduo ao conhecer, o que pode levar a mudanças estruturais na sua representação sobre cómo abordar o papel da mesma na produção do conhecimento da culpa. Palavras chave:Aflição, fracasso, liberdade, remorso, conhecimento.

Effect of Structurizing Agents on the Plasticization and Vulcanization of Butadiene-Styrene Rubber

1955 ◽  
Vol 28 (1) ◽  
pp. 57-65
Author(s):  
A. Novikov ◽  
F. A. Galil-Ogly
Keyword(s):  
Tensile Strength ◽  
Sulfur Content ◽  
Structural Changes ◽  
Oxidation Processes ◽  
Initial Stage ◽  
Equilibrium Modulus ◽  
High Elongation ◽  
Cross Links ◽  
Oxygen Groups ◽  
Butadiene Styrene

Abstract Compounds of the type of p-anisidine and N,N′-diphenyl-p-phenylenediamine cause structural changes in SKS-30A rubber and its solutions, particularly during heating. Vulcanization accelerators, in particular, mercaptobenzothiazole, greatly accelerate these structural changes in rubber in the presence of p-anisidine or N,N′-diphenyl-p-phenylenediamine during both heat oxidative plasticization and vulcanization. The degree and nature of the structural changes in rubber vary according to the type of accelerator. The structurizing action of p-anisidine and of N,N′-diphenyl-p-phenylenediamine during vulcanization is manifested in the increase of the tensile strength, equilibrium modulus, and rebound resilience of vulcanizates, and the retention of high relative elongations. The agents cited accelerate somewhat the process of combination of sulfur with the rubber in the initial stage of vulcanization, without increase of combined sulfur content at the point of optimum vulcanization. The hypothesis is advanced that the influence of p-anisidine and N,N′-diphenyl-p-phenylenediamine on the observed structural changes in SKS-30A rubber during its heat plasticization and vulcanization is related directly to the character of the oxidation processes, and may be caused by the reaction of the oxidized segments of the rubber (peroxide radicals, stable peroxides, functional oxygen groups, etc.) In unvulcanized rubber, this leads to a loss of plasticity and solubility, and, by vulcanization, to the formation of additional cross-links, to an increase of tensile strength, and with retention of high elongation at rupture. Vulcanization accelerators, such as mercaptobenzothiazole, which activate the oxidation processes in the rubber, increase considerably the rate and extent of these structural changes.

Chromosome structural changes and their role in the evolution of tetraploid wheats

Genome ◽  
1989 ◽  
Vol 32 (2) ◽  
pp. 257-261 ◽  
Author(s):  
Kaz. Noda ◽  
Ge Koulin
Keyword(s):  
Key Words ◽  
Structural Changes ◽  
Triticum Dicoccoides ◽  
Aegilops Speltoides ◽  
Banding Patterns ◽  
Tetraploid Wheats ◽  
B Genome ◽  
Triticum Boeoticum

The possibility that chromosomal interchanges present in the Timopheevi group (AAGG) are responsible for the differentiation of two different groups of tetraploid wheats, the Emmer group (AABB) and the Timopheevi (AAGG) group, has been examined. Chromosomes of Triticum dicoccoides (2n = 28, AABB) and six interchange types of the Timopheevi group (2n = 28, AAGG) were studied by N-banding. The banding patterns of the G genome were distinct from those of the B genome. The banding patterns of the G genome chromosomes of the interchange types were similar to the basic banding patterns of the G genome except those of interchanged chromosomes. No intermediate banding patterns between the B and G genomes were observed. These interchanges might have occurred after establishment of the basic karyotype of the G genome and would not be related to the differentiation of AABB and AAGG from a progenitor tetraploid, such as amphidiploid (AASS) between Aegilops speltoides (SS) and Triticum boeoticum (AA).Key words: tetraploid wheats, N-banding, interchange.

A review of structural changes in North American consumption of softwood lumber: Past, present and future

1996 ◽  
Vol 72 (6) ◽  
pp. 631-636
Author(s):  
David H. Cohen
Keyword(s):  
United States ◽  
Key Words ◽  
North American ◽  
Structural Changes ◽  
The United States ◽  
Residential Construction ◽  
Information Analysis ◽  
Softwood Lumber ◽  
End Use ◽  
Use Categories

A study of end use of softwood lumber consumption in Canada and the United States indicated that there was little difference among existing published information. Analysis of methodology by publication indicates that published information is most likely accurate. End use categories consisted of the following four sectors in descending order of quantity consumed: residential construction, repair and remodeling, non-residential construction and other. Each area is discussed in terms of past, current and future use trends. In addition major trends in both how lumber is consumed and distributed are discussed briefly. Key words: lumber, consumption, distribution, repair and remodeling

Comparative anatomy of absorbing roots and anchoring roots in three species of Cyclanthaceae (Monocotyledoneae)

1992 ◽  
Vol 70 (12) ◽  
pp. 2384-2404 ◽  
Author(s):  
George J. Wilder ◽  
Jeffrey R. Johansen
Keyword(s):  
Key Words ◽  
Vascular Tissue ◽  
Comparative Anatomy ◽  
Root Anatomy ◽  
Tracheary Elements ◽  
Sieve Elements ◽  
Quantitative Characteristics ◽  
Root Types ◽  
Absorbing Roots

Absorbing roots and anchoring roots of Asplundia sp., Evodianthus fiinifer, and Thoracocarpus bissectus differ from one another anatomically in at least 15 quantitative characteristics and in additional related respects. Differences are diverse, involving both stelar and extrastelar tissues. Absorbing roots are significantly greater in diameter, have more vascular tissue, exhibit broader tracheary elements and sieve elements, and have other characteristics supporting the hypothesis that those features logically interpretable as optimizing conduction in xylem and phloem predominate in the absorbing roots. The three species also differ significantly from each other according to the anatomy of their absorbing roots, with T. bissectus having the most distinctive anatomy. Statistical and nonstatistical approaches to analysis of the data provided very consistent results, both in regard to differences between the two root types under study and to differences between taxa. Key words: absorbing roots, anchoring roots, Asplundia, Cyclanthaceae, Evodianthus, root anatomy, Thoracocarpus.

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