scholarly journals ICTIOFAUNA DE POÇAS DE MARÉ EM TERRAÇOS CONSOLIDADOS DO LITORAL AMAZÔNICO BRASILEIRO

2021 ◽  
Vol 25 (04) ◽  
pp. 880-888
Author(s):  
Rayane Gonçalves Aguiar ◽  
◽  
Erick Cristofore Guimarães ◽  
Pâmella Silva de Brito ◽  
Felipe Polivanov Ottoni ◽  
...  
Keyword(s):  
Life Cycle ◽  
Brazilian Amazon ◽  
Life Cycles ◽  
Main Role ◽  
Physiological Plasticity ◽  
Biodiversity Knowledge ◽  
Tidal Pools ◽  
Species Being ◽  
Intertidal Fishes

As poças de maré são formadas pelo represamento de massas d’água durante a vazante e a sua troca ocorre ao longo de cada ciclo de marés, configurando em um ambiente explorado por várias espécies. A ictiofauna é um componente das poças de maré, algumas espécies são totalmente adaptadas (e.g. plasticidade fisológica, tamanho reduzido) e seu ciclo de vida ocorre apenas nas poças de maré. Contudo, muitas espécies utilizam as poças de maré em algumas fases do ciclo de vida para fins de alimentação, refúgio e reprodução. Considerando que os inventários são fundamentais para o conhecimento da biodiversidade, nosso estudo investigou a assembleia de peixes em poças de marés da Praia do Araçagy no período de outubro de 2016 a abril de 2017. No total, nós registramos 409 exemplares, pertencendo a 13 espécies, distribuídas em 11 famílias e sete ordens. Espécies residentes e estuarinas de importância comercial foram dominantes. INTERTIDAL FISHES OF THE CEMENTED TERRACES FROM BRAZILIAN AMAZON COAST: Tidal pools are formed by the damming of marine water during an ebb tide and their exchange occurs along each tidal cycle, configuring an environment explored by several species. The ichthyofauna is one of the components of the tide pools, with some species being fully adapted (e. g. physiological plasticity, reduced size) and their life cycles occuring uniquely on this environment. However, most species use tide pools at some stage of their life cycle for feeding, refuge and reproduction. Considering the main role of faunal inventories for the increase in biodiversity knowledge, this study investigates the fish assemblage in tide pools at Praia do Araçagy from October 2016 to April 2017. In total, were recorded 409 specimens belonging to 13 species, distributed in 11 families and seven orders. Resident and estuarine species with commercial importance were dominant.

Exploring the role of business relationships in start-ups’ life cycles

IMP Journal ◽  
2018 ◽  
Vol 12 (3) ◽  
pp. 519-543
Author(s):  
Chiara Cantù ◽  
Sepe Giorgia ◽  
Alessandra Tzannis
Keyword(s):  
Life Cycle ◽  
Secondary Data ◽  
Life Cycles ◽  
Business Relationships ◽  
Structured Interviews ◽  
Content Type ◽  
Strategic Resources ◽  
Start Up ◽  
Start Ups

Purpose Differently from previous works that focused on the entrepreneur and on his ability to manage social relationships, the purpose of this paper is to investigate the role of business relationships in the different stages of the life cycle of a start-up. Design/methodology/approach Since the paper aims to explore startups’ evolutionary phenomenon, it adopts a qualitative abductive methodology, presenting an in-depth study of two innovative Italian start-ups. The research is based on two steps. In the first one, the authors collected secondary data from start-ups’ reports and documents, financial indicators (when available) and processed them to understand their background. In the second one, the authors conducted ten semi-structured interviews, including face-to-face interviews, phone interviews and video conferences. Findings The paper presents a relationship-based life cycle model composed of four different stages, depending on the number and role of relationships developed. Indeed, since the beginning, start-ups adopt a relational approach and their evolution involves the shift from the focus on the entrepreneur to the centrality of a network approach based on interconnected relationships. The entering into a new stage of life cycle depends on relationships, mainly based on connected actors and resources shared and combined. Even if a key role is assumed by technology, the main resource is identified in the knowledge concerning the customer/user’s needs that require marketing competencies, human resources, relational capabilities. Thus, the shift from one stage to the next in the start-up’s life cycle is possible thanks to a parallel shift from a focus on the activities to a focus on those strategic and heterogeneous actors that ensure activities. Originality/value In a traditional perspective, the start-up’s life cycle depends on activities, financial resources and revenues, as stated by previous life cycle models. In a different perspective, as depicted in our analysis, the evolution of a start-up depends on the portfolio of their business relationships. The role of business relationships is hence to facilitate the interconnections within specialized key actors, which allow start-ups to access strategic resources. These resources are essential in order to develop the activities that characterize the specific stage of the life cycle.

Tetractinomyxon stages genetically consistent withSphaerospora dicentrarchi(Myxozoa: Sphaerosporidae) found inCapitellasp. (Polychaeta: Capitellidae) suggest potential role of marine polychaetes in parasite's life cycle

Parasitology ◽  
2016 ◽  
Vol 143 (8) ◽  
pp. 1067-1073 ◽  
Author(s):  
LUIS F. RANGEL ◽  
RICARDO CASTRO ◽  
SÓNIA ROCHA ◽  
RICARDO SEVERINO ◽  
GRAÇA CASAL ◽  
...  
Keyword(s):  
Life Cycle ◽  
Dna Sequences ◽  
Dicentrarchus Labrax ◽  
18S Rrna Gene ◽  
Life Cycles ◽  
Fish Farm ◽  
Rrna Gene ◽  
Commercial Fish ◽  
European Seabass

SUMMARYKnown life cycles of myxosporean parasites have two hosts, but very few life cycles have been disclosed, especially in the marine environment.Sphaerospora dicentrarchiSitjà-Bobadilla and Álvarez-Pellitero, 1992 is a systemic parasite from the European seabass,Dicentrarchus labrax(Linnaeus, 1758), a highly valuable commercial fish. It affects its health, leading to aquaculture production losses. During 2013 and 2014, an actinospore survey was conducted in a total of 5942 annelids collected from a fish farm in Algarve and from the Aveiro Estuary, in Portugal. A new tetractinomyxon actinospore was found in a capitellid polychaete, belonging to the generaCapitellacollected at the fish farm. The tetractinomyxons were pyriform measuring 11·1 ± 0·7µm in length and 7·2 ± 0·4µm in width, and presented three rounded polar capsules measuring 2·4 ± 0·3µm in diameter. The molecular analysis of the 18S rRNA gene sequences from the tetractinomyxons revealed a similarity of 100% with the DNA sequences deposited in the GenBank fromS. dicentrarchimyxospores collected from the European seabass and the spotted seabass in the same fish farm and 99·9% similarity with the DNA sequence obtained from the myxospores found infecting the European seabass in the Aveiro Estuary. Therefore, the new tetractinomyxons are inferred to represent the actinospore phase of theS. dicentrarchilife cycle.

scholarly journals Vegetable Temporalities: Life cycles, maturation and death in an Amerindian ethnography

2020 ◽  
Vol 17 ◽  
Author(s):  
Joana Cabral de Oliveira
Keyword(s):  
Life Cycle ◽  
Brazilian Amazon ◽  
Life Cycles

Abstract This article considers how relations with certain plants produce multiple temporalities for the Wajãpi, an Amerindian people from the Brazilian Amazon. Inspired by a non-anthropocentric anthropology or an “anthropology beyond the human,” the article is an ethnographic exploration about how the Wajãpi perceive the concrete and sensible features of certain vegetable species, and thus how they see them as subjects, in a process that produces different space-times. I also show how certain concepts are central to this same process, specifically, that of life cycle and maturation (including death), which lead to notions of co-temporality and difference between groups and individuals.

The role of cloud diabatic processes in the life cycle of Atlantic-European weather regimes

2021 ◽  
Author(s):  
Christian M. Grams
Keyword(s):  
Life Cycle ◽  
Large Scale ◽  
Multiple Scales ◽  
Weather Prediction ◽  
Time Lag ◽  
Conveyor Belt ◽  
Life Cycles ◽  
Weather Regimes ◽  
Diabatic Processes

<p>Weather regimes are quasi-stationary, persistent, and recurrent states of the large-scale extratropical circulation. In the Atlantic-European region these explain most of the atmospheric variability on sub-seasonal time scales. However, current numerical weather prediction (NWP) systems struggle in correctly predicting weather regime life cycles. Latent heat release in ascending air streams injects air into the upper troposphere, which might ultimately result in blocking. Such diabatic outflow is often linked to warm conveyor belt (WCB) activity and has been shown to be involved in upscale error growth up to the regime scale. This study systematically investigates the role of diabatic outflow in the life cycle of Atlantic-European weather regimes.</p><p>An extended definition of 7 year-round Atlantic-European weather regimes from 37 years of ERA-Interim reanalysis is used. This is based on an EOF analysis and k-means clustering of normalized low-pass-filtered 500hPa geopotential height anomalies. Furthermore an objective regime life cycle is derived. The role of cloud-diabatic processes in European weather regimes is assessed based on time lag analysis of WCB activity at specific life cycle stages.</p><p>Results indicate that the period prior to regime onset is characterized by important changes in location and frequency of WCB occurrence. Most importantly, prior to the onset of regimes characterized by blocking, WCB activity increases significantly upstream of the incipient blocking even before blocking is detectable and persists over the blocked region later. This suggests that diabatic WCB outflow helps to establish and maintain blocked regimes. Thus it is important to correctly represent cloud-diabatic processes in NWP models across multiple scales in order to predict the large-scale circulation accurately. Ongoing work now systematically investigates the representation of WCB activity in current NWP systems and how this relates to the forecast skill for weather regimes.</p>

scholarly journals Understanding the Life Cycles of Entrepreneurial Teams and Their Ventures: An Agenda for Future Research

2020 ◽  
pp. 104225872097838
Author(s):  
Holger Patzelt ◽  
Rebecca Preller ◽  
Nicola Breugst
Keyword(s):  
Life Cycle ◽  
Life Cycles ◽  
Team Formation ◽  
Future Research ◽  
Entrepreneurial Teams ◽  
The Past ◽  
Entrepreneurial Team ◽  
Over Time

While research on entrepreneurial teams has flourished over the past two decades, it has mainly taken a static perspective, neglecting the developments both teams and their ventures undergo over time. To address this issue, we develop a “double life cycle framework” covering entrepreneurial teams’ formation, collaboration, and dissolution phases as well as potential nonlinear sequences of these phases. While this team life cycle is embedded in the venture life cycle, both life cycles can progress independently. We offer research suggestions on entrepreneurial team formation, collaboration, and dissolution in each venture phase, highlighting the role of entrepreneurial teams in advancing their ventures.

scholarly journals Imperfect strategy transmission can reverse the role of population viscosity on the evolution of altruism

2019 ◽  
Author(s):  
F. Débarre
Keyword(s):  
Life Cycle ◽  
Social Interactions ◽  
Side Effect ◽  
Life Cycles ◽  
Stochastic Simulations ◽  
Altruistic Behavior ◽  
Weak Selection ◽  
Related Individuals ◽  
Population Viscosity

AbstractPopulation viscosity, i.e., low emigration out of the natal deme, leads to high within-deme relatedness, which is beneficial to the evolution of altruistic behavior when social interactions take place among deme-mates. However, a detrimental side-effect of low emigration is the increase in competition among related individuals. The evolution of altruism depends on the balance between these opposite effects. This balance is already known to be affected by details of the life cycle; we show here that it further depends on the fidelity of strategy transmission from parents to their offspring. We consider different life cycles and identify thresholds of parent-offspring strategy transmission inaccuracy, above which higher emigration can increase the frequency of altruists maintained in the population. Predictions were first obtained analytically assuming weak selection and equal deme sizes, then confirmed with stochastic simulations relaxing these assumptions. Contrary to what happens with perfect strategy transmission from parent to off-spring, our results show that higher emigration can be favorable to the evolution of altruism.

Managing Organizations

2013 ◽  
pp. 1-15
Keyword(s):  
Life Cycle ◽  
Organizational Behavior ◽  
Customer Orientation ◽  
Life Cycles ◽  
Organizational Life ◽  
Process Technology ◽  
Organizational Continuity ◽  
Evolutionary Phase ◽  
Culture Strategies

Managing organizations has always remained a challenge for its stakeholders. Challenges are not restricted only to managing factors of production like human resources, capital, and materials in the supply chain, but they also include important determinants for having a better culture, strategies for market and customer orientation, product innovations, and others. Life cycles in organizations are generally influenced by its products and services they deliver because they are to be accepted by the market, processes they adopt to meet the market-oriented product and services, and structures because of corrective measures adopted during every evolutionary phase organizations go through. Because of these effects in an organizational life cycle, organizations need to look after the systemic behaviors in order to ensure that continuity in the systems is retained. In order to achieve these objectives, there is need for the organization to remain prepared to seamlessly integrate organizational behavior with that of process, technology, and people. This chapter discusses these dimensions related to management of organizations, including motivation for creation of organizations, the desire to exist in the market with a better life cycle, and the role of management to ensure organizational continuity.

Role of spectrin in membrane fusion and in shape change of human erythrocyte ghost

1978 ◽  
Vol 36 (2) ◽  
pp. 328-329
Author(s):  
Hideo Hayashi ◽  
Yoshikazu Hirai ◽  
John T. Penniston
Keyword(s):  
Conformational Changes ◽  
Human Erythrocyte ◽  
Shape Change ◽  
Membrane Surface ◽  
Slight Modification ◽  
Active Role ◽  
Main Role ◽  
Bank Blood ◽  
Human Erythrocyte Ghost

Spectrin is a membrane associated protein most of which properties have been tentatively elucidated. A main role of the protein has been assumed to give a supporting structure to inside of the membrane. As reported previously, however, the isolated spectrin molecule underwent self assemble to form such as fibrous, meshwork, dispersed or aggregated arrangements depending upon the buffer suspended and was suggested to play an active role in the membrane conformational changes. In this study, the role of spectrin and actin was examined in terms of the molecular arrangements on the erythrocyte membrane surface with correlation to the functional states of the ghosts.Human erythrocyte ghosts were prepared from either freshly drawn or stocked bank blood by the method of Dodge et al with a slight modification as described before. Anti-spectrin antibody was raised against rabbit by injection of purified spectrin and partially purified.

Mesophyll conductance: the leaf corridors for photosynthesis

2020 ◽  
Vol 48 (2) ◽  
pp. 429-439 ◽  
Author(s):  
Jorge Gago ◽  
Danilo M. Daloso ◽  
Marc Carriquí ◽  
Miquel Nadal ◽  
Melanie Morales ◽  
...  
Keyword(s):  
Molecular Mechanisms ◽  
Current Knowledge ◽  
Main Role ◽  
Mesophyll Conductance ◽  
Future Studies ◽  
Cell Structures ◽  
Leaf Tissues ◽  
Change Framework ◽  
Chloroplast Stroma

Besides stomata, the photosynthetic CO2 pathway also involves the transport of CO2 from the sub-stomatal air spaces inside to the carboxylation sites in the chloroplast stroma, where Rubisco is located. This pathway is far to be a simple and direct way, formed by series of consecutive barriers that the CO2 should cross to be finally assimilated in photosynthesis, known as the mesophyll conductance (gm). Therefore, the gm reflects the pathway through different air, water and biophysical barriers within the leaf tissues and cell structures. Currently, it is known that gm can impose the same level of limitation (or even higher depending of the conditions) to photosynthesis than the wider known stomata or biochemistry. In this mini-review, we are focused on each of the gm determinants to summarize the current knowledge on the mechanisms driving gm from anatomical to metabolic and biochemical perspectives. Special attention deserve the latest studies demonstrating the importance of the molecular mechanisms driving anatomical traits as cell wall and the chloroplast surface exposed to the mesophyll airspaces (Sc/S) that significantly constrain gm. However, even considering these recent discoveries, still is poorly understood the mechanisms about signaling pathways linking the environment a/biotic stressors with gm responses. Thus, considering the main role of gm as a major driver of the CO2 availability at the carboxylation sites, future studies into these aspects will help us to understand photosynthesis responses in a global change framework.

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