scholarly journals Understanding Nutrition and Metabolism of Threatened, Data-Poor Rheophilic Fishes in Context of Riverine Stocking Success-Barbel as a Model for Major European Drainages?

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1245
Author(s):  
Koushik Roy ◽  
Peter Podhorec ◽  
Petr Dvorak ◽  
Jan Mraz

Large-bodied, river-migrating, rheophilic fishes (cyprinids) such as barbel Barbus barbus, nase Chondrostoma nasus, asp Leuciscus aspius, and vimba bream Vimba vimba are threatened in major European drainages. This represents the subject of our present study. Their hatchery nutrition prior to river-release is mostly on a hit-and-trial or carp-based diet basis. The study demonstrates an alternative approach to decide optimum nutrition for these conservation-priority and nutritionally data-poor fishes. The study revealed barbel as a central representative species in terms of wild body composition among other native rheophilic cyprinids considered (asp, nase, vimba bream). Taking barbel as a model, the study shows that barbel or rheophilic cyprinids may have carnivorous-like metabolism and higher requirements of S-containing, aromatic, branched-chain amino acids (AAs) than carps. Besides, there are important interactions of AAs and fatty acids (FAs) biosynthesis to consider. Only proper feeding of nutritionally well-selected diets may contribute to river stocking mandates such as steepest growth trajectory (≈less time in captivity), ideal size-at-release, body fitness (≈blend-in with wild conspecifics, predator refuge), better gastrointestinal condition, maximized body reserves of functional nutrients, and retention efficiencies (≈uncompromised physiology). Considering important physiological functions and how AA–FA interactions shape them, hatchery-raised fishes on casually chosen diets may have high chances of physiological, morphological, and behavioral deficits (≈low post-stocking survivability). Based on the observations, optimum nutrient requirements of juvenile (0+ to 1+ age) barbels are suggested. Future efforts may consider barbels as a nutrition model for conservation aquaculture of threatened and data poor rheophilic cyprinids of the region.

2014 ◽  
Vol 15 (3) ◽  
pp. 577-598
Author(s):  
Abul Quasem Al-Amin ◽  
Abdul Hamid Jaafar

Within a process of modeling exercise, this study aimed to understand appropriate selection criteria to identify key industries. There are many key sector identification linkage measures in the subject matter and sensitivity issue among them can be tricky because many of these measures differ only slightly but can result in outcomes that are quite dissimilar. With this background, we proposed an alternate approach that helps to resolve this issue. The proposed approach utilizes in this study by five sub-methods and high degree of the frequency of their occurrences in sub-methods to determine the key sectors. The study approach is applied to Malaysia as the public sector investment remains a large share in the national economy, like other developing countries, and the correct identification is still a challenge for sectoral planning. The experiences from this study can be used to guide appropriate public investment in Malaysia and elsewhere with similar economic forms.


Author(s):  
Roozbeh Sanaei ◽  
Kevin Otto ◽  
Katja Hölttä-Otto ◽  
Jianxi Luo

Product modularity has been the subject of considerable research and debate in last decade. Various metrics have been proposed in design community to measure the level of modularity and various procedures have been developed to search for ideal modular architectures. These procedures are based on either manual heuristics or computer clustering algorithms. Both approaches are aimed at finding more ideal architectures by optimizing a definition of modularity. However, different desirable criteria are often in conflict with each other and improving one criteria is not feasible without a compromising effect on another. Here, we propose a procedure to find non-dominated optimal architectures where our criteria of interest are intra-cluster and extra-cluster costs. We demonstrate an approach where a designer can consider the architecture that minimizes total cost of interactions, but also allows visualization of the trade-off in increased and decreased costs when considering nearby architectures with more or less modules. An alternative approach has been to consider granularity and hierarchical clustering schemes. We also show through an example that cost optimal architectures for any choice of number of modules are not necessarily obtainable via dividing or aggregating modules, and restricting to hierarchical clustering algorithms produces non-optimal solutions at different numbers of modules.


2020 ◽  
pp. 155335062094556
Author(s):  
Faith Hyun Kyung Jeon ◽  
Michelle Griffin ◽  
Aurora Almadori ◽  
Jajini Varghese ◽  
Stephanie Bogan ◽  
...  

Background. Three-dimensional (3D) photography provides a promising means of breast volumetry. Sources of error using a single-captured surface to calculate breast volume include inaccurate designation of breast boundaries and prediction of the invisible chest wall generated by computer software. An alternative approach is to measure differential volume using subtraction of 2 captured surfaces. Objectives. To explore 3D breast volumetry using the subtraction of superimposed images to calculate differential volume. To assess optimal patient positioning for accurate volumetric assessment. Methods. Known volumes of breast enhancers simulated volumetric changes to the breast (n = 12). 3D photographs were taken (3dMDtorso) with the subject positioned upright at 90° and posteriorly inclined at 30°. Patient position, breathing, distance and camera calibration were standardised. Volumetric analysis was performed using 3dMDvultus software. Results. A statistically significant difference was found between actual volume and measured volumes with subjects positioned at 90° ( P < .05). No statistical difference was found at 30° ( P = .078), but subsequent Bland–Altman analysis showed evidence of proportional bias ( P < .05). There was good correlation between measured and actual volumes in both positions (r = .77 and r = .85, respectively). Univariate analyses showed breast enhancer volumes of 195 mL and 295 mL to incur bias. The coefficient of variation was 5.76% for single observer analysis. Conclusion. Positioning the subject at a 30° posterior incline provides more accurate results from better exposure of the inferior breast. The subtraction tool is a novel method of measuring differential volume. Future studies should explore methodology for application into the clinical setting.


2008 ◽  
Vol 53 (No. 10) ◽  
pp. 441-452 ◽  
Author(s):  
K.K. Lefler ◽  
Á. Hegyi ◽  
F. Baska ◽  
J. Gál ◽  
Á. Horváth ◽  
...  

Investigations on the ovarian cycle of fish species that inhabit Hungarian rivers are necessitated by both environmental and economic reasons. The objective of our research was to explore new fundamental knowledge concerning the ovarian cycle of the white bream (<I>Blicca bjoerkna</I>, Linnaeus, 1758), barbel (<I>Barbus barbus</I>, Linnaeus, 1758), orfe <I>(Leuciscus idus</I>, Linnaeus, 1758) and nase (<I>Chondrostoma nasus</I>, Linnaeus, 1758). Histological investigation of ovaries and determination of proportions of oocytes in different stages of development is an appropriate method for the description of spawning characteristics of these species. Our results show that the GSI value for all four investigated species starts to increase at the end of summer and reaches its maximum before spawning. In the barbel and white bream, the presence of oocytes in the stage of cortical alveoli and the heterogeneous size of oocytes in the stage of vitellogenesis in the pre-spawning period indicate that barbel and white bream are multiple spawners. In contrast, in the orfe and nase, the absence of oocytes in the stage of cortical alveoli and the homogeneous size of cells in the stage of vitellogenesis indicate that orfe and nase are single spawners.


2001 ◽  
Vol 17 (3) ◽  
pp. 417-426 ◽  
Author(s):  
Andrew Charleson ◽  
Julieanna Preston ◽  
Mark Taylor

Current seismic strengthening approaches to historic buildings place emphasis upon concealing engineering technologies. This study investigates, through a process of architectural and structural engineering design, the architectural possibilities inherent in a completely different approach. Recognizing both conservation concerns and the architectural qualities of two existing earthquake-prone buildings, the study explores seismic strengthening strategies that are exposed to view in order to contribute, in both a physical and aesthetic sense, a layer of architectural richness. A 1960s eight-story reinforced-concrete office building and a three-story unreinforced masonry building are the subject of theoretical seismic strengthening schemes. The paper describes the buildings, the strengthening approaches from both architectural and structural engineering perspectives, and comments on the outcome with respect to conservation guidelines. Although the proposed schemes challenge some sections of the guidelines, the authors believe the exposed structure enhances the existing architecture, and in so doing suggests an alternative approach for seismic retrofitting.


2017 ◽  
Vol 46 (2) ◽  
pp. 142-164 ◽  
Author(s):  
Marco A. Vieira

In this article, I critically engage with and develop an alternative approach to ontological security informed by Jacques Lacan’s theory of the subject. I argue that ontological security relates to a lack; that is, the always frustrated desire to provide meaningful discursive interpretations to one’s self. This lack is generative of anxiety which functions as the subject’s affective and necessary drive to a continuous, albeit elusive, pursuit of self-coherence. I theorise subjectivity in Lacanian terms as fantasised discursive articulations of the Self in relation to an idealised mirror-image other. The focus on postcolonial states’ subjectivity allows for the examination of the anxiety-driven lack generated by the ever-present desire to emulate but also resist the Western other. I propose, therefore, to explore the theoretical assertion that postcolonial ontological security refers to the institutionalisation and discursive articulation of enduring and anxiety-driven affective traces related to these states’ colonial pasts that are still active and influence current foreign policy practices. I illustrate the force of this interpretation of ontological security by focusing on Brazil as an example of a postcolonial state coping with the lack caused by its ambivalent/hybrid self-identity.


2019 ◽  
pp. 23-35 ◽  
Author(s):  
Elżbieta Goryńska-Goldmann

This paper reviews the conceptual apparatus and the genesis of local food, on the basis of definitions and with respect to legal conditions, as well as the popular ways of interpretation of local food and scientific research performed by different centers and institutions – both domestic and foreign. On the basis of that, the paper presents the author’s own proposition concerning the abovementioned issue. The aim of the paper is to present the genesis and the definition of local food in the perspective of sustainable consumption. While conducting the research, the scientific literature concerning the subject was reviewed, and the findings were documented with available statistical and market information. The research showed that public institutions see the potential of local food and hope that it can drive the development of rural areas in the European Union. Local food is an alternative approach to the way in which food consumption can be turned into a sustainable one. Informed and responsible consumers, who are aware of their own limitations and value tradition, provide some new quality to the society (as they constitute a specific form of social capital), what translates into bigger local food production possibilities and is the basis for the further development of sustainable consumption.


10.14311/776 ◽  
2005 ◽  
Vol 45 (6) ◽  
Author(s):  
V. Tesař

Helicity offers an alternative approach to investigations of the structure of turbulent flows. Knowledge of the spatial distribution of the time-mean component of helicity is the starting point. Yet very little is known even about basic cases in which Helicity plays important role, such as the case of a swirling jet. This is the subject of the present investigations, based mainly on numerical flowfield computations. The region of significantly large time-mean helicity density is found only in a rather small region reaching to several nozzle diameters downstream from the exit. The most important result is the similarity of the helicity density profiles. 


2018 ◽  
Vol 6 (1) ◽  
pp. 27
Author(s):  
Dian Novita

Extensive Reading subject has important benefits for EFL learners. The main purpose of the subject is to raise the positive reading habit for the students. However, for most students, Extensive Reading is not an easy subject to complete. This paper describes the implementation of syndicate learning approach in Extensive Reading subject at English Study Program, Universitas Muhammadiyah Sidoarjo. The students’ perceptions of the approach were collected through survey research with opinionative with Likert scales as the instrument. In addition, there were 16 participants engaged in the study. The results showed that majority of the students gave positive views of syndicate learning approach for both as the individual participant and the member of group. The study is expected to contribute a solution for problems may rise in Extensive Reading subject.


Author(s):  
Arsenii Belomytsev

The subject of this article is the attempts of the Russian researchers to interpret the destructive processes in modern Russian society through the prism of development of archaization theory. Due to the lack of semantic definiteness, the concept of social archaization is often attributed to similar ones, such as &ldquo;traditionalism&rdquo;, &ldquo;barbarization&rdquo;, &ldquo;patriarchalization&rdquo;, &ldquo;New Middle Ages", etc. The diversity of existing approaches substantiates the need to determine a certain theoretical core, which would become the foundation for further hypotheses. Special attention is given to problem of absence of a unified approach towards the definition of archaizing processes, as well as to the need for clarification and further functionality of the concept of social archaization. The novelty of this research consists in the critical overview and determination of flaws in the existing concepts of social archaization. It is demonstrated that the relevant findings of the Russian researchers do not always explain the origin of destructive processes in the Russian society. The effective practical solution to complications related to the phenomenon of social destruction is yet to be developed. The author proposes an alternative approach towards determination of the causes of archaization of the Russian society at the current stage; outlines the promising ways of reflection on archaizing trends; as well as formulates a refined definition of archaization of the modern society. The acquired results aim to lay theoretical foundation for further development and implementation of measures on overcoming destructive consequences of social archaicism.


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