ON SOME QUANTITATIVE REGULARITIES IN THE FORMATION OF MUSSEL (MYTILUS GALLOPROVINCIALIS, LAM.) HARVEST ON VARIOUS TYPES OF ARTIFICIAL SUBSTRATES

Fisheries ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 83-87
Author(s):  
Aleksandr Zolotnitskiy ◽  
Efim Kozhurin ◽  
Natalya Sytnik
Keyword(s):  
Power Function ◽  
Intraspecific Competition ◽  
Mytilus Galloprovincialis ◽  
Dynamic Equilibrium ◽  
Logistic Equation ◽  
The State ◽  
Artificial Substrate ◽  
Artificial Substrates ◽  
Life Space ◽  
Ecological Capacity

Quantitative regularities in the formation of mussel harvest (B) on various types of artificial substrates are investigated for four substrates, varying by the collector area (S) per 1 linear meter: 0,09, 0,21, 0,34 and 0,55 sq. m. The results of mollusk cultivation on the collectors with various artificial substrate areas have shown that the dynamics of biomass (B) depends on the time of cultivation (t) and can be described by a logistic equation: Bt = B st/(1 - eb-kt). A relation between a harvest and a collector area has been identified, and this relation is approximated by a power function: B = 2,62 S1,25. It is shown that the harvest formation is mediated through the intraspecific competition for artificial substrate (life space), which is fulfilled through self-thinning; as a result, the population ends up in the state of dynamic equilibrium that corresponds to “ecological capacity” of a collector.

scholarly journals Seasonal and bathymetric effects on macrofouling invertebrates’ primary succession in a mediterraenan non-indigenous species hotspot area

2018 ◽  
Vol 19 (3) ◽  
pp. 572 ◽  
Author(s):  
MARCO LEZZI ◽  
ADRIANA GIANGRANDE
Keyword(s):  
Community Development ◽  
Species Interactions ◽  
Primary Succession ◽  
Mytilus Galloprovincialis ◽  
Abundant Species ◽  
Artificial Substrates ◽  
Indigenous Species ◽  
Central Mediterranean ◽  
Almost All ◽  
Non Indigenous Species

The present study investigates macrofouling development in the Mar Grande of Taranto (Central Mediterranean Sea), a wide confined area that has attracted considerable attention in recent years due to the establishment of numerous non-indigenous species (NIS). Different starting times of a yearly primary succession on artificial substrates were tracked so as to investigate the matching of the development pattern with contingency and/or convergence models, identifying NIS’s structural role in the community endpoint. Our results show that during the experiment all assemblages tended to converge towards multiple contingent communities according to starting times and depths. The differences are due to propagule availability which influence further species interactions. Thus the endpoint patterns are defined by a contingent community development determined by the seasonal species pool, their phenologies, pre- and post-settlement events, and species interactions. The most important structuring species was Mytilus galloprovincialis, which was present in almost all the endpoint assemblages, in particular when it recruits at early stages of the community development. Another abundant species at the endpoint was the alien Branchiomma boholense; which was a persistent structural component contributing to an alternative state in which Mytilus galloprovincialis loses its structural importance and where B. boholense becomes dominant, leading to an increase in fouling biodiversity of the endpoint assemblage.

EFFECTS OF INSULIN ON RATES OF GLUCOSE TRANSFER IN THE DEPANCREATIZED DOG

1955 ◽  
Vol 33 (6) ◽  
pp. 926-939 ◽  
Author(s):  
Margaret J. Henderson ◽  
Gerald A. Wrenshall ◽  
Paul Odense
Keyword(s):  
Plasma Glucose ◽  
Dynamic Equilibrium ◽  
Specific Activity ◽  
The State ◽  
Time Intervals ◽  
Lower Blood Glucose ◽  
In Vivo Experiments ◽  
Lower Blood ◽  
Before And After

An attempt to answer the question as to whether insulin acts to lower blood glucose by increasing utilization, or by decreasing production, or by both, has been made using a new experimental approach. A trace dose of radioactive glucose was injected into each of six postabsorptive depancreatized dogs which had been deprived of exogenous insulin for 66 hr. Blood samples were collected before and after the intravenous injection of insulin, and plasma glucose concentration and specific activity were measured. From these data the simultaneous rates of appearance and disappearance of plasma glucose were calculated for a sequence of time intervals, both before and after insulin, by a method which did not assume dynamic equilibrium. Previous in vivo experiments using radioactive tracers to measure rates of production and utilization of glucose have been made in animals which were in steady states, either with or without insulin, and the effects of insulin were ascertained by comparison of the state with insulin and the state without insulin. The method described in this paper has made it possible to follow the effects of insulin while it is acting in one and the same animal. Insulin was found to cause an abrupt and marked increase in the rate of disappearance of glucose, and this increased rate became less with time, reaching the preinsulin level in about 90 min. Insulin caused a slower and much smaller decrease in the rate of appearance, but the decrease became greater with time during the three hour period of observation. Thus, it appeared that insulin acted in vivo both to increase the utilization of glucose and to decrease its production, but the effects differed in magnitude and in speed of response.

scholarly journals Colonization of benthic invertebrates on artificial and natural substrate in a Neotropical lotic environment in Southern Brazil

2019 ◽  
Vol 41 ◽  
pp. e45872 ◽  
Author(s):  
Nilce Svarcz Jungles de Camargo ◽  
Atsler Luana Lehun ◽  
Jonathan Rosa ◽  
Ana Carolina de Deus Bueno-Krawczyk
Keyword(s):  
Benthic Invertebrates ◽  
Artificial Substrate ◽  
Artificial Substrates ◽  
Natural Substrate ◽  
Tropical Stream ◽  
Taxonomic Level ◽  
Lotic Environment ◽  
Significant Difference ◽  
Colonization Process ◽  
South Brazil

The objective of this research was to validate the colonization process on natural and artificial substrates by benthic invertebrates in a tropical stream in South Brazil. The samples were performed in July and August-2012, and 32 samplers were used, being 16 natural and 16 artificial substrates. In each sample, two replicas were taken for each substrate at the 2th, 4th, 7th, 14th, 21th 28th, 35th and 42th days of colonization. The organisms were identified to the lowest possible taxonomic level. In both substrates 3,070 benthic invertebrates were detected, of which 1,753 individuals were collected on the natural substrate, and 1,317 on the artificial substrate. From the identified taxa 8.5% were not dominant (Anacroneuria, Orthocladiinae, Tupiara, Smicridea, Baetodes, Tupiperla, Macrogynoplax, Gripopteryx, Cylloepus, Macrelmis, Microcylloepus, Hetaerina, Argia, Coryphaeschna, Atopsyche, Pomacea, Corydalus, Leptohyphes and Eccoptura), and 31.5% were dominant (Tanypodinae, Chironominae, and Paragripopteryx). The genus Simulium was very common, dominant and abundant, representing 65% of the collected individuals. No significant difference was found in the abundance and species composition between artificial and natural substrates. On the natural substrate, the higher colonization index was at the 35th day with 459 individuals, and the lowest was at the 14th day, with 87. On the artificial substrate the highest index was at the 42th day with 337 individuals, and the lowest was at the 4th day, with 85. Both natural and artificial substrates are efficient in characterizing the benthic community. In the evaluation of the ecological succession, it was not possible to observe a pattern that described the process, since the composition was nearly constant throughout the study period.

scholarly journals Periphyton biomass on artificial substrates during the summer and winter

2015 ◽  
Vol 45 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Altevir Signor ◽  
Arcangelo Augusto Signor ◽  
Wilson Rogério Boscolo ◽  
Adilson Reidel ◽  
Sidnei Klein ◽  
...  
Keyword(s):  
Water Column ◽  
Biomass Production ◽  
Low Cost ◽  
Biomass Productivity ◽  
Artificial Substrate ◽  
Artificial Substrates ◽  
Live Food ◽  
Significant Variability ◽  
Periphyton Biomass ◽  
Black Plastic

This study evaluated the periphyton production on artificial substrates considering it as a source of low cost live food for fish. Blades of artificial substrates such as wood, black plastic, acrylic, fiberglass, ceramics and glass (all with 144cm2 blades, 24 for each substrate) were submerged 20.0cm below the water column for 35 days in the winter and 42 days in the summer. The blades were randomly installed in 200m3 pond and evaluated for the biomass production at different phases during the summer and winter. Four blades of each substrate were collected weekly, and the periphytic community was carefully scraped with a spatula and fixed in 4% formaldehyde. The periphytic biomass productivity was evaluated by artificial substrate area and per day. The results evidenced the characteristic periodicity in periphyton biomass production and a significant variability in the collect period and season in the different artificial substrates used. Ceramic and wood showed the best results in the summer while wood showed the best results in the winter. The priphyton biomass productions differ among periods, substrates and seasons. Wood and ceramics could be indicated for periphyton biomass production in either winter or summer.

scholarly journals Comments to the article “The political role of the State in Cambridge theories of growth and distribution”

2021 ◽  
Vol 41 (1) ◽  
pp. 207-214
Author(s):  
JOÃO GABRIEL DE ARAUJO OLIVEIRA ◽  
RENATO NOZAKI SUGAHARA ◽  
JOANILIO RODOLPHO TEIXEIRA
Keyword(s):  
Income Distribution ◽  
Dynamic Equilibrium ◽  
The State ◽  
The Political ◽  
Political Role ◽  
Essential Nature ◽  
Role Of The State ◽  
The Government ◽  
The Stability

ABSTRACT This comment came to refute and correct the idea of Charles (2007) about the negatively implications in the income distribution when the government expand the consumption in favour to households. We prove that the political choice, to both cases (increasing consumption or increasing profit), impact positively the income distribution and does not affect the essential nature of the Kaldor neo-Pasinetti dynamic equilibrium results and the “Cambridge Equation”. The stability of the model is guarantee by applying the Olech’s Theorem to the case.

Structure and succession of periphyton in an urban reservoir: artificial substrate specificity

2017 ◽  
Vol 46 (4) ◽  
Author(s):  
Ivana Trbojević ◽  
Jelena Jovanović ◽  
Dušan Kostić ◽  
Slađana Popović ◽  
Jelena Krizmanić ◽  
...  
Keyword(s):  
Substrate Specificity ◽  
Environmental Changes ◽  
Artificial Substrate ◽  
Artificial Substrates ◽  
Ecological Groups ◽  
Periphyton Community ◽  
Algae Growth ◽  
Colonization Process ◽  
The Relationship ◽  
Insight Into

AbstractSubstrate specificity of the periphyton community is usually underestimated in both periphyton ecology and biomonitoring studies, thus different kinds of both natural and artificial substrates (of organic and inorganic origin) are employed. Periphyton colonization and successional trajectories are particularly debatable processes when different kinds of substrates are considered. In our field experiment, we deployed four kinds of artificial substrates (two inorganic ones – glass and ceramic, and two organic ones – willow and yew wooden tiles) for the development of periphyton in an urban reservoir referred to as Lake Savsko (Belgrade, Serbia). We comparatively investigated the structure, colonization process, diversity and successional trajectories of periphyton. We also assessed the relationship between the dynamics of algae growth forms (ecological groups) on different substrates and selected abiotic limnological factors. Our objective was to determine whether the type of substrate affects periphyton characteristics at various levels and whether an artificial substrate potentially affects the bioindication capacity of ecological groups. We concluded that all substrates behave similarly at the level of structure and colonization phases, but when considering diversity and successional trajectories, the substrate specificity was demonstrated. Our results suggest that communities developed on inert substrates (glass and ceramic) could provide more realistic insight into complex environmental changes.

scholarly journals The Establishment of a Concept of Equilibrium of the Economic Basis of the Constitutional Order as a Universal Axiological Metaprinciple

2020 ◽  
Vol 21 (2) ◽  
pp. 304-321
Author(s):  
Ekaterina Yakimova
Keyword(s):  
Social Development ◽  
Economic System ◽  
Dynamic Equilibrium ◽  
Dynamic Balance ◽  
The State ◽  
Constitutional Development ◽  
Economic Relations ◽  
Role Of The State ◽  
The Social ◽  
History Of

Defining the foundation of social development is one of the most important issues of all time. For economic relations the issue is addressed through the prism of defining the role of the state in the establishment and development of the economic system of society. Without attempting to reveal the essence and all the engines of the economic system of a society, and without pretending to be true only of the authors conception, we note that, in all the diversity of economic relations, they all have causality, as do all relationships. In this connection, the movement towards the attainment of values (axiological) is an important component of social development, one of which is the achievement of a dynamic balance between the social system in general and the economic system in particular. The desire to achieve a dynamic balance also manifests itself in the fact that it is embodied in different levels of law, becoming a legal value, which is particularly evident during the period of constitutional development of the state. The history of the formation and implementation of the concept of dynamic equilibrium as a universal metaprinciple through legal acts reflects the evolutionary movement of both States and societies, becoming the constitutional denominator, which any state can invoke at any stage of historical development, which is the case in the present study.

scholarly journals Influence of mineral and organic artificial substrates on productivity of covered ground tomato under additional lighting

2022 ◽  
Vol 42 ◽  
pp. 02010
Author(s):  
P. M. Isaeva ◽  
L. Sh. Daulakova ◽  
N. L. Adaev ◽  
A. G. Amaeva ◽  
Zh. Kh. Aiskhanova
Keyword(s):  
Artificial Substrate ◽  
Artificial Substrates ◽  
Daily Growth ◽  
Tomato Plants

The article presents the results of studying the reaction of tomato plants to an artificial substrate on which they are grown with all other things being equal — lighting, nutrition, temperature, and etc. Among the studied parameters, the plants reacted to the greatest extent with an average daily growth, filling of fruits, which mainly influenced the yield of tomatoes.

The “Barbaric” Dabke

2021 ◽  
Vol 17 (2) ◽  
pp. 197-219
Author(s):  
Shayna Silverstein
Keyword(s):  
Power Function ◽  
Cultural Production ◽  
Hegemonic Masculinity ◽  
State Power ◽  
The State ◽  
Folk Culture

Abstract This essay analyzes how dance, gender, and state power function together as a significant node of critique in recent cultural production that addresses authoritarianism in Syria. Identifying the symbolic trope of dabke, a popular dance ubiquitous in Syrian life, selected films, literature, and choreography, this essay argues that the discussed works dislodge dabke from its feminized association with authenticity, folk culture, and nationhood to instead represent dabke as a form of hegemonic masculinity that perpetuates sovereignty, patriarchy, and autocracy. Through the rendering of embodied acts of dabke performance, hegemonic and resilient modes of masculinity are equated with spectacles of violence attached to the state, repressive tactics by the police state, and performative complicity with the regime. This essay argues that sovereign and autocratic forms of power are not universal abstractions but are embedded in the gendered structures of the society in which such power is performed.

MEDIACULTURE AS A NECESSARY FACTOR OF THE CONSERVATION, DEVELOPMENT AND TRANSFORMATION OF ETHNIC AND NATIONAL IDENTITY

2021 ◽  
Author(s):  
Ihor Pavlyuk ◽  
Keyword(s):  
National Identity ◽  
Mass Media ◽  
Dynamic Equilibrium ◽  
The State ◽  
Information Support ◽  
State Institutions ◽  
Information Law ◽  
Humanitarian Space ◽  
The Media ◽  
Transfer Of Information

The article deals with the mental-existential relationship between ethnoculture, national identity and media culture as a necessary factor for their preservation, transformation, on the example of national original algorithms, matrix models, taking into account global tendencies and Ukrainian archetypal-specific features in Ukraine. the media actively serve the domestic oligarchs in their information-virtual and real wars among themselves and the same expansive alien humanitarian acts by curtailing ethno-cultural programs-projects on national radio, on television, in the press, or offering the recipient instead of a pop pointer, without even communicating to the audience the information stipulated in the media laws − information support-protection-development of ethno-culture national product in the domestic and foreign/diaspora mass media, the support of ethnoculture by NGOs and the state institutions themselves. In the context of the study of the cultural national socio-humanitarian space, the article diagnoses and predicts the model of creating and preserving in it the dynamic equilibrium of the ethno-cultural space, in which the nation must remember the struggle for access to information and its primary sources both as an individual and the state as a whole, culture the transfer of information, which in the process of globalization is becoming a paramount commodity, an egregore, and in the post-traumatic, interrupted-compensatory cultural-information space close rehabilitation mechanisms for national identity to become a real factor in strengthening the state − and vice versa in the context of adequate laws («Law about press and other mass media», Law «About printed media (press) in Ukraine», Law «About Information», «Law about Languages», etc.) and their actual effect in creating motivational mechanisms for preserving/protecting the Ukrainian language, as one of the main identifiers of national identity, information support for its expansion as labels cultural and geostrategic areas.

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