scholarly journals Physical-chemical mechanisms of pattern formation during gastrulation

2018 ◽  
Vol 148 (12) ◽  
pp. 123302 ◽  
Author(s):  
Behnaz Bozorgui ◽  
Anatoly B. Kolomeisky ◽  
Hamid Teimouri
Keyword(s):  
Pattern Formation ◽  
Chemical Mechanisms ◽  
Physical Chemical

scholarly journals Myelin can't change the basic mechanisms of axonal conduction

2017 ◽  
Author(s):  
Alessandro M Morelli ◽  
Isabella Panfoli
Keyword(s):  
Neuronal Activity ◽  
Nerve Conduction ◽  
Conduction Mechanism ◽  
Chemical Mechanisms ◽  
Axonal Conduction ◽  
Physical Chemical ◽  
Myelinated Nerves ◽  
New Hypothesis ◽  
Precise Role

We propose a new hypothesis about the physical-chemical mechanisms of nerve conduction in myelinated nerves, tending to bridge the theoretical gap existing to date between the basic neuronal activity and its adaptation to myelination. All the considerations imply a simplification of the underlying theories, identifying a precise role for myelin. The ATP-supplying energetic role for myelin allows to overcome the theories that have not yet found a physical-chemical solid confirmation. A radical simplification of nerve conduction mechanism is envisaged: it can be supposed that this mechanism remains unaltered in the passage from the unmyelinated to the myelinated conditions.

Microwave Treatment of Hazardous Wastes: Physical Chemical Mechanisms

1992 ◽  
Vol 269 ◽  
Author(s):  
Leonard Dauerman ◽  
Gabriele Windgasse ◽  
Naihong Zhu ◽  
Yaoll He
Keyword(s):  
Field Testing ◽  
Microwave Treatment ◽  
Toxic Heavy Metals ◽  
Waste Streams ◽  
Major Drawback ◽  
Power Cost ◽  
Chemical Mechanisms ◽  
Physical Chemical ◽  
Site Field ◽  
Power Costs

ABSTRACTThe objective Is to develop processes to treat hazardous waste streams using microwave treatment. First, physical chemical mechanisms have been posited for a variety, of such waste streams including: soils contaminated with organics, and toxic heavy metals; “spent” GAC; organics in the gas phase. Second, feasibility tests are being carried out to determine if on-site field testing is warranted. In the case of microwave-induced steam distillation of volatile and semivolatile organics, pilot plant stuides indicate that the incident power cost is not prohibitive: that fear of prohibitive power costs has been thought to be the major drawback for micrwave treatment to become a competitive technology in this market.

scholarly journals FTIR analysis of chemical changes in wood induced by steaming and longitudinal compression

Cellulose ◽  
2020 ◽  
Vol 27 (12) ◽  
pp. 6811-6829 ◽  
Author(s):  
Mátyás Báder ◽  
Róbert Németh ◽  
Jakub Sandak ◽  
Anna Sandak
Keyword(s):  
Functional Groups ◽  
Cell Walls ◽  
Beech Wood ◽  
Industrial Applications ◽  
Structural Elements ◽  
Longitudinal Compression ◽  
Chemical Mechanisms ◽  
Modification Process ◽  
Physical Chemical ◽  
Detailed Interpretation

Abstract Pleating is an optimal way to increase bendability of wood used in diverse industrial applications. It results in the excessive buckling of cell walls and modifications of constitutive polymers. However, thoughtful understanding of the physical–chemical mechanisms of that modification process is very limited. The main purpose of the present study was to identify changes in functional groups of wood polymers induced by longitudinal compression. Four types of wood samples prepared from beech and sessile oak (untreated, steamed, longitudinally compressed and fixated for 1 min as well as longitudinally compressed and fixated for 18 h) were assessed by infrared spectroscopy. The spectra interpretation revealed that changes can be observed in hydroxyl as well as in carbon–oxygen single and carbon-hydrogen functional groups of polysaccharides and lignin. Beech wood seems to be more susceptible to investigated modification processes as compared to oak. Detailed interpretation of infrared spectra allows identification of changes in the hygroscopicity of wood as well as alterations in the linkage between structural elements in the polymer matrix of wood induced by the applied treatments. Graphic Abstract

Physical-chemical mechanisms in slow sand filters

1997 ◽  
Vol 89 (1) ◽  
pp. 87-100 ◽  
Author(s):  
Monroe L. Weber-Shirk ◽  
Richard I. Dick
Keyword(s):  
Sand Filters ◽  
Chemical Mechanisms ◽  
Physical Chemical

Towards a general theory of evolution

2018 ◽  
Author(s):  
Terrence W. Deacon
Keyword(s):  
Natural Selection ◽  
General Theory ◽  
Physical System ◽  
Physical Work ◽  
Theory Of Evolution ◽  
Chemical Mechanisms ◽  
Physical Chemical ◽  
Selective Retention ◽  
Far From Equilibrium ◽  
Natural Selection Theory

Towards a general theory of evolution argues that defining natural selection in terms of “blind variation and selective retention”— as in A-life and replicator selection—ignores the fact that what varies is necessarily part of a far-from-equilibrium physical system that requires physical work to be produced. But natural selection theory is agnostic about the physical-chemical mechanisms underlying the maintenance, repair, and reproduction of organism structures and functions. A more general theory of evolution is proposed that includes an account of a type of process able to reconstitute the organization of the physical system capable of producing that process if damaged.

scholarly journals Nanosonotechnology: the next challenge in cancer sonodynamic therapy

2012 ◽  
Vol 1 (2) ◽  
pp. 173-182 ◽  
Author(s):  
Loredana Serpe ◽  
Federica Foglietta ◽  
Roberto Canaparo
Keyword(s):  
Chemical Structure ◽  
Chemical Compounds ◽  
Acoustic Cavitation ◽  
Sonodynamic Therapy ◽  
Chemical Mechanisms ◽  
Physical Chemical ◽  
Anticancer Treatment ◽  
Ultrasound Bioeffects ◽  
Ultrasound Energy ◽  
Physical And Chemical

AbstractSonodynamic therapy (SDT) is a newly developed anticancer treatment where ultrasound is used to trigger the cytotoxic effect of chemical compounds, known as sonosensitizers. Although SDT is similar to photodynamic therapy (PDT), SDT activates the chemical compounds through energy transfer using ultrasound rather than light. Moreover, SDT can focus the ultrasound energy onto malignant sites situa\xadted deeply within tissues, thus overcoming the main drawback linked to the use of PDT. Several physical and chemical mechanisms underlying ultrasound bioeffects and anticancer SDT take advantage of the non-thermal effect of acoustic cavitation generated by selected pulsed or continuous ultrasound. As the physical-chemical structure of the sonosentizer is essential for the success of SDT, we believe that the different aspects related to nanotechnology in medicine might well be able to improve the triggering effect ultrasound has on sonosensitizing agents. Therefore, the aim of this review is to focus on how nanotechnology might improve this innovative anticancer therapeutic approach.

scholarly journals Nanoparticles: importance today, class ification, use in medicine, toxicity

2015 ◽  
Vol 17 (3) ◽  
Author(s):  
I. A. Bandas ◽  
I. Ya. Krynytska ◽  
M. I. Kulitska ◽  
M. M. Korda
Keyword(s):  
The State ◽  
Toxic Effects ◽  
Scientific Publications ◽  
Chemical Mechanisms ◽  
Internet Resources ◽  
Physical Chemical ◽  
The World ◽  
Depth Study ◽  
State Of Research

<p>In recent years research in various areas of nanoscience in the world and in Ukraine is rapidly developing. According<br />to scientific publications and internet resources authors had analyzed the state of research in various fields<br />of nanotechnology, nanomedicine, nanotoxicology, nanochemistry of metals. The authors drew attention to the need<br />for in-depth study of the physiological, biochemical and physical-chemical mechanisms of nanoparticles’ on living<br />organism in order to prevent their possible toxic effects.</p>

scholarly journals Myelin can't change the basic mechanisms of axonal conduction

2017 ◽  
Author(s):  
Alessandro M Morelli ◽  
Isabella Panfoli
Keyword(s):  
Neuronal Activity ◽  
Nerve Conduction ◽  
Conduction Mechanism ◽  
Chemical Mechanisms ◽  
Axonal Conduction ◽  
Physical Chemical ◽  
Myelinated Nerves ◽  
New Hypothesis ◽  
Precise Role

We propose a new hypothesis about the physical-chemical mechanisms of nerve conduction in myelinated nerves, tending to bridge the theoretical gap existing to date between the basic neuronal activity and its adaptation to myelination. All the considerations imply a simplification of the underlying theories, identifying a precise role for myelin. The ATP-supplying energetic role for myelin allows to overcome the theories that have not yet found a physical-chemical solid confirmation. A radical simplification of nerve conduction mechanism is envisaged: it can be supposed that this mechanism remains unaltered in the passage from the unmyelinated to the myelinated conditions.

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