scholarly journals Universal motifs and the diversity of autocatalytic systems

2020 ◽  
Vol 117 (41) ◽  
pp. 25230-25236 ◽  
Author(s):  
Alex Blokhuis ◽  
David Lacoste ◽  
Philippe Nghe
Keyword(s):  
Kinetic Analysis ◽  
Chemical Evolution ◽  
Systematic Study ◽  
Reaction Networks ◽  
Unified Approach ◽  
Unified Framework ◽  
Basic Principles ◽  
The Origin Of Life ◽  
Catalytic Cycles

Autocatalysis is essential for the origin of life and chemical evolution. However, the lack of a unified framework so far prevents a systematic study of autocatalysis. Here, we derive, from basic principles, general stoichiometric conditions for catalysis and autocatalysis in chemical reaction networks. This allows for a classification of minimal autocatalytic motifs called cores. While all known autocatalytic systems indeed contain minimal motifs, the classification also reveals hitherto unidentified motifs. We further examine conditions for kinetic viability of such networks, which depends on the autocatalytic motifs they contain and is notably increased by internal catalytic cycles. Finally, we show how this framework extends the range of conceivable autocatalytic systems, by applying our stoichiometric and kinetic analysis to autocatalysis emerging from coupled compartments. The unified approach to autocatalysis presented in this work lays a foundation toward the building of a systems-level theory of chemical evolution.

scholarly journals Autocatalysis in Chemical Networks: Unifications and Extensions

2020 ◽  
Author(s):  
Alex Blokhuis ◽  
David Lacoste ◽  
Philippe Nghe
Keyword(s):  
Kinetic Analysis ◽  
Chemical Evolution ◽  
Chemical Reaction ◽  
Systematic Study ◽  
Reaction Networks ◽  
Essential Property ◽  
Unified Approach ◽  
Unified Framework ◽  
Basic Principles

Autocatalysis is an essential property for theories of abiogenesis and chemical evolution. However, the different formalisms proposed so far seemingly address different forms of autocatalysis and it remains unclear whether all of them have been captured. Furthermore, the lack of unified framework thus far prevents a systematic study of autocatalysis. Here, we derive general stoichiometric conditions for catalysis and autocatalysis in chemical reaction networks from basic principles in chemistry. This allows for a classification of minimal autocatalytic motifs, which includes all known autocatalytic systems and motifs that had not been reported previously. We further examine conditions for kinetic viability of such networks, which depends on the autocatalytic motifs they contain. Finally, we show how this framework extends the range of conceivable autocatalytic systems, by applying our stoichiometric and kinetic analysis to autocatalysis emerging from coupled compartments. The unified approach to autocatalysis presented in this work lays a foundation towards the building of a systems-level theory of chemical evolution.<br>

scholarly journals Autocatalysis in Chemical Networks: Unifications and Extensions

2020 ◽  
Author(s):  
Alex Blokhuis ◽  
David Lacoste ◽  
Philippe Nghe
Keyword(s):  
Kinetic Analysis ◽  
Chemical Evolution ◽  
Chemical Reaction ◽  
Systematic Study ◽  
Reaction Networks ◽  
Essential Property ◽  
Unified Approach ◽  
Unified Framework ◽  
Basic Principles

Autocatalysis is an essential property for theories of abiogenesis and chemical evolution. However, the different formalisms proposed so far seemingly address different forms of autocatalysis and it remains unclear whether all of them have been captured. Furthermore, the lack of unified framework thus far prevents a systematic study of autocatalysis. Here, we derive general stoichiometric conditions for catalysis and autocatalysis in chemical reaction networks from basic principles in chemistry. This allows for a classification of minimal autocatalytic motifs, which includes all known autocatalytic systems and motifs that had not been reported previously. We further examine conditions for kinetic viability of such networks, which depends on the autocatalytic motifs they contain. Finally, we show how this framework extends the range of conceivable autocatalytic systems, by applying our stoichiometric and kinetic analysis to autocatalysis emerging from coupled compartments. The unified approach to autocatalysis presented in this work lays a foundation towards the building of a systems-level theory of chemical evolution.<br>

scholarly journals Autocatalysis in Chemical Networks: Unifications and Extensions

2020 ◽  
Author(s):  
Alex Blokhuis ◽  
David Lacoste ◽  
Philippe Nghe
Keyword(s):  
Kinetic Analysis ◽  
Chemical Evolution ◽  
Chemical Reaction ◽  
Systematic Study ◽  
Reaction Networks ◽  
Essential Property ◽  
Unified Approach ◽  
Unified Framework ◽  
Basic Principles

Autocatalysis is an essential property for theories of abiogenesis and chemical evolution. However, the different formalisms proposed so far seemingly address different forms of autocatalysis and it remains unclear whether all of them have been captured. Furthermore, the lack of unified framework thus far prevents a systematic study of autocatalysis. Here, we derive general stoichiometric conditions for catalysis and autocatalysis in chemical reaction networks from basic principles in chemistry. This allows for a classification of minimal autocatalytic motifs, which includes all known autocatalytic systems and motifs that had not been reported previously. We further examine conditions for kinetic viability of such networks, which depends on the autocatalytic motifs they contain. Finally, we show how this framework extends the range of conceivable autocatalytic systems, by applying our stoichiometric and kinetic analysis to autocatalysis emerging from coupled compartments. The unified approach to autocatalysis presented in this work lays a foundation towards the building of a systems-level theory of chemical evolution.<br>

Basic principles for classification of equipment of energy facilities

2020 ◽  
Vol 13 (1) ◽  
pp. 4-10
Author(s):  
E. P. Grabchak ◽  
A. I. Vorobyev ◽  
S. V. Mischeryakov
Keyword(s):  
Basic Principles

FEATURES OF OPHTHALMIC CARE FOR PATIENTS WITH COMPLICATED CATARACTS

2020 ◽  
pp. 84-89
Author(s):  
Inna Ivanovna Lapkina
Keyword(s):  
Health Care ◽  
Surgical Treatment ◽  
Postoperative Complications ◽  
Key Words ◽  
Outpatient Treatment ◽  
Practical Application ◽  
Unified Approach ◽  
Case Histories ◽  
High Prevalence

Today, around 50 million people worldwide suffer from cataracts, more than a half of them need surgical treatment. High prevalence of this pathology in Ukraine, the need to improve the provision of ophthalmic care to patients, and the reform of the health care system have made the research relevant. Concomitant diseases and special conditions of the eye increase the risk of intra− and postoperative complications, worsen the functional parameters of patients after surgery. In order to develop a unified approach to the treatment of complicated cataracts based on diagnostically related groups of patients, a retrospective analysis of case histories of patients with different variants of complications related to the condition of the lens itself, its ligament apparatus and other structures of the eye was conducted. In each case, the surgeon has to choose the appropriate modification of cataract phacoemulsification surgery. The study proposed the classification of cataract phacoemulsification modifications on the basis of the techniques and the sequence of operation stages, taking into account the classification of the degrees of turbidity of the lens, proposed by L. Buratto. It has been noted that in complicated cases, according to the indications of the patient, surgery may be performed on several modifications of cataract phacoemulsification. The developed classification made it possible to generalize the various variants of pathology and greatly facilitate the choice of tactics of surgical treatment in complicated cataracts. It can be used not only for practical application, but also for improving the qualification of trained professionals. The prospect of further research is to identify contraindications for outpatient treatment of the patients with complicated cataracts. Key words: cataract complication, classification of phacoemulsification modifications, diagnostically related groups.

Chemical evolution and the origin of life

1980 ◽  
Vol 10 (4) ◽  
pp. 379-401 ◽  
Author(s):  
Linda G. Pleasant ◽  
Cyril Ponnamperuma
Keyword(s):  
Origin Of Life ◽  
Chemical Evolution ◽  
The Origin Of Life

Chemical evolution and the origin of life

1975 ◽  
Vol 6 (1-2) ◽  
pp. 285-298 ◽  
Author(s):  
Martha W. West ◽  
Elizabeth D. Gill ◽  
Keith A. Kvenvolden
Keyword(s):  
Origin Of Life ◽  
Chemical Evolution ◽  
The Origin Of Life

THE IMPORTANCE OF THE LAW "ON OPERATIONAL INSPECTION ACTIVITIES" IN THE IMPLEMENTATION OF PREVENTION OF OFFENSES

2021 ◽  
Vol 6 (6) ◽  
pp. 71-78
Author(s):  
Farxod Djurayev ◽  
Keyword(s):  
Legal Status ◽  
Legal Protection ◽  
Law Enforcement Officers ◽  
Joint Work ◽  
Basic Principles ◽  
The Law ◽  
Causes Of Crime ◽  
Prevention Of Crime

The article is devoted to the prevention of crime, maintenance of public order and early crime prevention, identification and elimination of the causes of crime in each district, family and individual, classification of each district depending on the crime situation in these regions and joint work to attract all forces and means to identify and eliminate the causes of crime, the role of the law "On operational-search activities" in the prevention of offenses, the concept of operational-search activities, the main tasks, basic principles; bodies carrying out operational-search activities, their legal status; types of operational-search measures and their comments regarding the procedure for conducting a search; social and legal protection of law enforcement officers and persons assisting in the conduct of such events, as well as their family members

scholarly journals ON THE CLASSIFICATION OF NUCLEAR C*-ALGEBRAS

2002 ◽  
Vol 85 (1) ◽  
pp. 168-210 ◽  
Author(s):  
MARIUS DADARLAT ◽  
SØREN EILERS
Keyword(s):  
Subject Classification ◽  
Unified Approach ◽  
C Algebras ◽  
Starting Point ◽  
K Theory

We employ results from KK-theory, along with quasidiagonality techniques, to obtain wide-ranging classification results for nuclear C*-algebras. Using a new realization of the Cuntz picture of the Kasparov groups we show that two morphisms inducing equal KK-elements are approximately stably unitarily equivalent. Using K-theory with coefficients to associate a partial KK-element to an approximate morphism, our result is generalized to cover such maps. Conversely, we study the problem of lifting a (positive) partial KK-element to an approximate morphism. These results are employed to obtain classification results for certain classes of quasidiagonal C*-algebras introduced by H. Lin, and to reprove the classification of purely infinite simple nuclear C*-algebras of Kirchberg and Phillips. It is our hope that this work can be the starting point of a unified approach to the classification of nuclear C*-algebras.2000 Mathematical Subject Classification: primary 46L35; secondary 19K14, 19K35, 46L80.

scholarly journals Ensuring Human Rights in Ukraine: Problematic Issues and Ways of their Solution in the Social and Legal Sphere

2020 ◽  
Vol 37 (64) ◽  
pp. 124-136
Author(s):  
Yevhen Leheza ◽  
Tatiana Filipenko ◽  
Olha Sokolenko ◽  
Valerii Darahan ◽  
Oleksii Kucherenko
Keyword(s):  
Human Rights ◽  
Integrated Approach ◽  
Unified Approach ◽  
Legal Norms ◽  
The Social ◽  
Political Forces ◽  
Protection Of Human Rights ◽  
The Stability ◽  
Development Prospects

The article discusses some complex factors influencing the process of realization of human rights in Ukraine, highlights the unified approach to the classification of legal norms that exercise human rights and freedoms, as well as problems and development prospects. Now the real protection of human rights is one of the most acute problems of the Ukrainian reality. It serves as one of the most important tasks, not only for the functioning but also for the existence of the Ukrainian state. Therefore, it should be borne in mind that guaranteeing respect for human rights in Ukraine is only possible through effective reform of the power system and compliance with an integrated approach to guarantee human rights, both by the State and by society. civil. It is concluded that guaranteeing the general enjoyment and enjoyment of human rights is a matter of co-responsibilities, which is why it is also negatively affected by the rigid opposition of the political forces, which undermines the stability of society, the stability of the constitutional order. While increasing the low level of legal culture of officials and citizens.

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