Self-maintaining System Research Articles

Exploitation of Sb P-doped C3N4 and peroxidase immobilized on epoxidized linseed oil films for pollutant removal

Effective coupling of a photocatalyst able to produce H2O2 and peroxidase, giving a self-standing and self-maintaining system.

The enactive naturalization of normativity: from self-maintenance to situated interactions.

The autopoietic enactive account of cognition explains the emergence of normativity in nature as the norm of self-maintenance of life. The autonomous nature of living agents implies that they can differentiate events and regulate their responses in terms of what is better or worse to maintain their own precarious identity. Thus, normative behavior emerges from living organisms. Under this basic understanding of normativity as self-maintenance, autopoietic enactivism defends a continuity between biological, cognitive, and social norms. The self-maintenance of an agent's sensorimotor identity establishes the cognitive norms that regulate its behavior, and the self-maintenance of its social identity determines the social norms. However, there is no clear explanation of how individuals, who by their very constitution are primarily moved to interact with the world under the norm of self-maintenance, could interact with the world driven by non-individual norms. Furthermore, understanding all normativity as self-maintenance makes it unclear how agents establish genuine social interactions and acquire habits that have no implication for their constitution as individuals. So, to face these challenges, I propose an alternative notion of normativity grounded on a Wittgensteinian, action-oriented, and pragmatic conception of meaning that distinguishes between an agent with a normative point of view and external normative criteria. I defend that a normative phenomenon is an interaction that is established by an individual point of view as defined by autopoietic enactivism and that is part of a self-maintaining system. The latter establishes the external normative criteria to evaluate the interaction, and it may or may not coincide with the identity of the interacting agent. Separating external normative criteria from the self-constitution of the interactant agent not only solves the challenge but potentially explains the situated and relational character of agency.

Assessment of the State of Tulipa lehmanniana Mercklin Populations Under the Conditions of the Kyzylkum Desert

Coenopopulations of Tulipa lehmanniana Merckl. have been studied and assessed as normal, with the full range of age groups, except for the Tamdyn population, for which no senile fraction has been observed. The complex of determinating indices of coenopopulations with high variation coefficients includes the population density, projective cover, and the width of the bottom leaf. Coenopopulations represent viable, sustainable, integral, and self-maintaining systems capable of self-renewal by either generative or vegetative means.

The Origin of a Trans-Generational Organization in the Phenomenon of Biogenesis.

One of the central issues of the whole process of biogenesis is how to understand the progressive constitution of a large (in spatial and temporal terms) system that transcends the individual sphere of proto-metabolic organizations and includes collective networks, both synchronous (i.e., proto-ecosystem webs) and asynchronous (i.e., trans-generational protocell populations). This paper analyzes the appearance of a minimal form of reproduction in the process of biogenesis from an organizational perspective. This perspective highlights the problem of how a process transcending the actual organization of the reproducing entities (i.e., protocells) could have a causal power. It is proposed that this problem may be explained if we consider that reproduction generates a kind of feedback between the actual concatenation of the processes of each reproducing cycle and the type continuity that a reliable iteration of these cycles creates. Thus, reproduction generates a new form of self-maintaining system linking “organismal” and “evolutionary” domains, since the consequence of the iteration of self-reproducing cycles is the long-term continuity of a specific type of SM compartmentalized organization, and the functional role of a particular self-reproducing organization (token) lies in its capacity to trigger a diachronic succession of similar self-reproducing organizations, i.e., a lineage.

The Objectivity of Organizational Functions.

We critique the organizational account of biological functions by showing how its basis in the closure of constraints fails to be objective. While the account treats constraints as objective features of physical systems, the number and relationship of potential constraints are subject to potentially arbitrary redescription by investigators. For example, we show that self-maintaining systems such as candle flames can realize closure on a more thorough analysis of the case, contradicting the claim that these "simple" systems lack functional organization. This also raises problems for Moreno and Mossio's associated theory of biological autonomy, which asserts that living beings are distinguished by their possession of a closed system of constraints that channel and regulate their metabolic processes.

Chemical roots of biological evolution: the origins of life as a process of development of autonomous functional systems.

In recent years, an extension of the Darwinian framework is being considered for the study of prebiotic chemical evolution, shifting the attention from homogeneous populations of naked molecular species to populations of heterogeneous, compartmentalized and functionally integrated assemblies of molecules. Several implications of this shift of perspective are analysed in this critical review, both in terms of the individual units, which require an adequate characterization as self-maintaining systems with an internal organization, and also in relation to their collective and long-term evolutionary dynamics, based on competition, collaboration and selection processes among those complex individuals. On these lines, a concrete proposal for the set of molecular control mechanisms that must be coupled to bring about autonomous functional systems, at the interface between chemistry and biology, is provided.

Evolution, reproduction and autopoiesis

The term autopoiesis was coined to describe the regenerating and self-maintaining chemical systems of cells. The term has subsequently been applied to many different fields, including sociology, systems theory and information systems. This theory postulates that an autopoietic unity (cell, machine) is an organised network of processes that exists in a delimited space, which produces components which in turn continuously regenerate and create the network of processes that produced them. The Santiago Theory of Cognition grew from the Theory of Allopoiesis stating that all living systems are cognitive systems, and the process of living is a process of cognition. Cognition is the ability to adapt to a certain environment and cognition emerges because of a continuous bilateral interaction between the system and its environment. The resultant complexity seen in living systems is caused by this interaction between the system and its environment. Autopoiesis and cognition are however opposing concepts because cognition can only exist when the system is open and not closed as autopoiesis suggests. It is also difficult to see how autopoietic systems could originate if they are closed and how the continuous change which we see in evolution can be explained if life consists of autopoietic systems. It is postulated that cells and organisms are in fact open systems relating genetically to ancestors before them and their ever-changing descendants after them and the flow of molecules and energy through an ever-changing ecology.

Self-sustainable, high-power-density bio-solar cells for lab-on-a-chip applications.

A microfluidic lab-on-a-chip system that generates its own power is essential for stand-alone, independent, self-sustainable point-of-care diagnostic devices to work in limited-resource and remote regions. Miniaturized biological solar cells (or micro-BSCs) can be the most suitable power source for those lab-on-a-chip applications because the technique resembles the earth's natural ecosystem - living organisms work in conjunction with non-living components of their environment to create a self-assembling and self-maintaining system. Micro-BSCs can continuously generate electricity from microbial photosynthetic and respiratory activities over day-night cycles, offering a clean and renewable power source with self-sustaining potential. However, the promise of this technology has not been translated into practical applications because of its relatively low power (∼nW cm-2) and current short lifetimes (∼a couple of hours). In this work, we enabled high-performance, self-sustaining, long-life micro-BSCs by using fundamental breakthroughs of device architectures and electrode materials. A 3-D biocompatible, conductive, and porous anode demonstrated great microbial biofilm formation and a high rate of bacterial extracellular electron transfer, which led to greater power generation. Furthermore, our micro-BSCs promoted gas exchange to the bacteria through a gas-permeable PDMS membrane in a well-controlled, tightly enclosed micro-chamber, substantially enhancing sustainability. Through photosynthetic reactions of the cyanobacteria Synechocystis sp. PCC 6803 without additional organic fuel, the 90 μL single-chambered bio-solar cell generated a maximum power density of 43.8 μW cm-2 and sustained consistent power production of ∼18.6 μW cm-2 during the day and ∼11.4 μW cm-2 at night for 20 days, which is the highest and longest reported success of any existing micro-scale bio-solar cells.

Are scientists a workforce? - Or, how Dr. Frankenstein made biomedical research sick: A proposed plan to rescue US biomedical research from its current 'malaise' will not be effective as it misdiagnoses the root cause of the disease.

Are scientists a workforce? - Or, how Dr. Frankenstein made biomedical research sick: A proposed plan to rescue US biomedical research from its current 'malaise' will not be effective as it misdiagnoses the root cause of the disease.

The Organizational Account of Function is an Etiological Account of Function.

The debate on the notion of function has been historically dominated by dispositional and etiological accounts, but recently a third contender has gained prominence: the organizational account. This original theory of function is intended to offer an alternative account based on the notion of self-maintaining system. However, there is a set of cases where organizational accounts seem to generate counterintuitive results. These cases involve cross-generational traits, that is, traits that do not contribute in any relevant way to the self-maintenance of the organism carrying them, but instead have very important effects on organisms that belong to the next generation. We argue that any plausible solution to the problem of cross-generational traits shows that the organizational account just is a version of the etiological theory and, furthermore, that it does not provide any substantive advantage over standard etiological theories of function.

Very high resolution crop surface models (CSMs) from UAV-based stereo images for rice growth monitoring In Northeast China

Abstract. Unmanned aerial vehicles (UAVs) became popular platforms for the collection of remotely sensed geodata in the last years (Hardin & Jensen 2011). Various applications in numerous fields of research like archaeology (Hendrickx et al., 2011), forestry or geomorphology evolved (Martinsanz, 2012). This contribution deals with the generation of multi-temporal crop surface models (CSMs) with very high resolution by means of low-cost equipment. The concept of the generation of multi-temporal CSMs using Terrestrial Laserscanning (TLS) has already been introduced by Hoffmeister et al. (2010). For this study, data acquisition was performed with a low-cost and low-weight Mini-UAV (< 5 kg). UAVs in general and especially smaller ones, like the system presented here, close a gap in small scale remote sensing (Berni et al., 2009; Watts et al., 2012). In precision agriculture frequent remote sensing on such scales during the vegetation period provides important spatial information on the crop status. Crop growth variability can be detected by comparison of the CSMs in different phenological stages. Here, the focus is on the detection of this variability and its dependency on cultivar and plant treatment. The method has been tested for data acquired on a barley experiment field in Germany. In this contribution, it is applied to a different crop in a different environment. The study area is an experiment field for rice in Northeast China (Sanjiang Plain). Three replications of the cultivars Kongyu131 and Longjing21 were planted in plots that were treated with different amounts of N-fertilizer. In July 2012 three UAV-campaigns were carried out. Establishment of ground control points (GCPs) allowed for ground truth. Additionally, further destructive and non-destructive field data were collected. The UAV-system is an MK-Okto by Hisystems (http://www.mikrokopter.de) which was equipped with the high resolution Panasonic Lumix GF3 12 megapixel consumer camera. The self-built and self-maintained system has a payload of up to 1 kg and an average flight time of 15 minutes. The maximum speed is around 30 km/h and the system can be operated up to a wind speed of less than 19 km/h (Beaufort scale number 3 for wind speed). Using a suitable flight plan stereo images can be captured. For this study, a flying height of 50 m and a 44% side and 90% forward overlap was chosen. The images are processed into CSMs under the use of the Structure from Motion (SfM)-based software Agisoft Photoscan 0.9.0. The resulting models have a resolution of 0.02 m and an average number of about 12 million points. Further data processing in Esri ArcGIS allows for quantitative comparison of the plant heights. The multi-temporal datasets are analysed on a plot size basis. The results can be compared to and combined with the additional field data. Detecting plant height with non-invasive measurement techniques enables analysis of its correlation to biomass and other crop parameters (Hansen & Schjoerring, 2003; Thenkabail et al., 2000) measured in the field. The method presented here can therefore be a valuable addition for the recognition of such correlations.

Where to Look for Emergent Properties

Recent years have seen renewed interest in the emergence issue. The contemporary debate, in contrast with that of past times, has to do not so much with the mind–body problem as with the relationship between the physical and other domains; mostly with the biological domain. One of the main sources of this renewed interest is the study of complex and, in general, far-from-equilibrium self-preserving systems, which seem to fulfil one of the necessary conditions for an entity to be emergent; namely, that its causal powers are not predictable from the causal powers of basic physical properties. However, I argue that much of the current emergentism debate has misfired by focusing on the interpretation of self-maintaining systems. In contrast, I claim that if we want to find emergent properties, we should look not at complex systems, but at selection (natural selection, in particular). I argue that selection processes make the causal world ‘exuberant’ by making non-physical functional and relational properties enter the causal web of the world.

An Organizational Account of Biological Functions

In this paper, we develop an organizational account that defines biological functions as causal relations subject to closure in living systems, interpreted as the most typical example of organizationally closed and differentiated self-maintaining systems. We argue that this account adequately grounds the teleological and normative dimensions of functions in the current organization of a system, insofar as it provides an explanation for the existence of the function bearer and, at the same time, identifies in a non-arbitrary way the norms that functions are supposed to obey. Accordingly, we suggest that the organizational account combines the etiological and dispositional perspectives in an integrated theoretical framework. 1. Introduction 2. Dispositional Approaches 3. Etiological Theories 4. Biological Self-maintenance 4.1. Closure, teleology, and normativity 4.2. Organizational differentiation 5. Functions 5.1. C1: Contributing to the maintenance of the organization 5.2. C2: Producing the functional trait 6. Implications and Objections 6.1. Functional versus useful 6.2. Dysfunctions, side effects, and accidental contributions 6.3. Proper functions and selected effects 6.4. Reproduction 6.5. Relation with other ‘unitarian’ approaches 7. Conclusions

Stoichiometric analysis of self-maintaining metabolisms

This paper presents an extension of stoichiometric analysis in systems where the catalytic compounds (enzymes) are also intermediates of the metabolic network ( dual property), so they are produced and degraded by the reaction network itself. To take this property into account, we introduce the definition of enzyme-maintaining mode, a set of reactions that produces its own catalyst and can operate at stationary state. Moreover, an enzyme-maintaining mode is defined as elementary with respect to a given reaction if the removal of any of the remaining reactions causes the cessation of any steady state flux through this reference reaction. These concepts are applied to determine the network structure of a simple self-maintaining system.

Design of Web-based Directories for Human Services: Potential for Community-Directed Self-Maintaining Systems

Design of Web-based Directories for Human Services: Potential for Community-Directed Self-Maintaining Systems

Designing for nature and sustainability

Humankind is now using natural resources more rapidly than natural systems can replace them and has been doing so for approximately two and a half decades. Moreover, both natural capital and the ecosystem services it provides are being diminished at an unprecedented rate. Finally, the human population is expected to increase by three billion by 2050. This situation is clearly unsustainable, but it can be made less so by redesigning societal wastes so that they benefit the biospheric life-support system. Nature initiates and maintains a system of energy and nutrient cycling and, if the system integrity is maintained, provides alternative and redundant means that help stabilize functional capacity. The system is composed of opportunistic individuals that compete with other individuals to acquire the resources essential to their survival. The interrelationships within this aggregation of individuals (i.e. system components) are based on energy flow. This self-organizing and self-maintaining system is increasingly stressed by human activities. Humans are a part of, not apart from, this system and are governed by the same laws of nature. In short, an ecologically-based economic system is essential to sustainable use of the planet. The planet's life-support system has been a superb model of sustainability, which humans should emulate and become a part of more than they now are. When the biospheric life-support system is stressed to the point of disequilibrium, the results are disastrous for societies, individuals and ecosystems. Evolutionary processes have produced replacement systems following the five great biological extinctions. However, the probability is high that the next replacement system will not be as suitable for humankind as the present system. Sustainable practices are intended to prevent biospheric disequilibrium and maintain the present environmental conditions so favorable to humankind, including posterity.

Mechanism of the effect of postresuscitation changes in the brain on the dynamics of extinction of orientation and exploratory response in rats

The type of open-field behavior (determined in preliminary tests) was preserved after 10-min circulatory arrest. Postresuscitation changes in the bran modified orientation and exploratory activity under conditions of its partial extinction before clinical death. High behavioral activity of rats in the first open-field session after resuscitation was related to the impairment of memory traces, while that in the follow-up period was associated with the formation of a pathological self-maintaining system between components of orientation and exploratory behavior.

Piggyback Statistics Collection for Query Optimization: Towards a Self-Maintaining Database Management System

A database management system (DBMS) performs query optimization based on statistical information about data in the underlying database. Out-of-date statistics may lead to inefficient query processing in the system. The existing utility method, which collects statistics in batch mode, suffers from drawbacks such as heavy administrative burden, high system load and tardy updates. In this paper, we study approaches to performing statistical analysis on the fly during query execution, taking advantage of data already resident in main memory. We propose a framework for on-the-fly statistics collection, which we term piggybacking, and analyze the tradeoffs of piggybacking various statistics collection techniques on top of query execution plans. We present a multiple-granularity interleaving algorithm to integrate a set of piggyback operations with an execution plan, and show how the algorithm can be incorporated into an existing query optimizer. Our experiments demonstrate that useful statistics can be obtained via the piggyback method with a small overhead.

Legal Autonomy and Reflexive Rationality in Complex Societies

Proponents of the idea that law has assumed an endemically closed character consider that there are severe limits to the possibility of successful legal regulation in highly complex and socially differentiated societies. This idea reaches its most radical form in the theory of law as an autopoietic system which suggests that the autonomous individual at the core of most traditional legal theory should be replaced by the self-creating and self-maintaining legal system. Advocates of this theory suggest that legal scientists and practitioners should reject traditional rationales of legal regulation and adopt a new, and more modest, mode of legal rationality called reflexive law. In this article, we argue, first, that the idea that specialized autopoietic subsystems have epistemic primacy is flawed and, second, that this initial argument coupled to a conception of the function of law which is held in both autopoietic theory and more traditional conceptions of law reveals an insight into the possibility of effective legal regulation in complex societies. Specifically, effective legal regulation in complex societies requires a reformulation of reflexive law so that basic principles of political morality are incorporated within its autonomous domain.

Threatened landscape in Alentejo, Portugal: the ‘montado’ and other ‘agro-silvo-pastoral’ systems

In Portugal agro-silvo-pastoral systems correspond to the mixed land use types characteristic of the region of Alentejo, in the southern part of the country. There is a triple and complementary use of the land, adapted to the low potentialities of the soil and to the Mediterranean climate: open evergreen forest (oaks, olive and chestnut trees), grazing and cultivation. Due to their mixed characteristics and to the extensive form of exploitation, these systems constitute varied landscapes of high biological diversity. They have been managed through decades as an almost self-maintained system, with a minimum of human work input, but furnishing nevertheless the necessary outputs for the dispersed rural population of the area. Actually, due to the decrease in the economic value of some of the products concerned and to the changing context for Portuguese agriculture, these agro-silvo-pastoral systems have registered perturbations by intensification or extensification; in both cases there is a degradation or disappearance of the corresponding landscapes.