SPECIAL FEATURES OF OOCYTE SIZE IN SO-IUY MULLET (PLANILIZA HAEMATOCHEILA TEMMINCK & SCHLEGEL, 1845) IN THE SEA OF AZOV AT THE END OF THE WINTER SEASON, 2019

2020 ◽  
Author(s):  
L.A. Bugaev ◽  
◽  
A.V. Voykina ◽  
S.G. Sergeeva
Keyword(s):  
Winter Season ◽  
Individual Characteristics ◽  
Oocyte Diameter ◽  
Sea Of Azov ◽  
Oocyte Size ◽  
Bioactive Substances ◽  
Spawning Period ◽  
Gonad Maturity ◽  
Individual Specimen

Analysis of special features of the reproductive system of so-iuy mullet Planiliza haematocheila (Temminck & Schlegel, 1845) females from the Azov and Black Sea Basin at the end of the winter season, 2019, has been conducted using the size of oocytes as its basis. Individual differences in distribution of oocyte sizes during the period of trophoplazmatic growth have been identified. Following the estimation of ordered series of oocyte sizes during the period of trophoplazmatic growth, the median and percentile values have been calculated; they can be used as reference values for qualitative characterization of ordered series for oocyte diameter in an individual specimen, using the empirical median, calculated for the respective specimen, as a basis. It has been found out that the sizes of trophoplazmatic growth oocytes, which are utilized during the spawning period of the current year, and, therefore, the degree of gonad maturity have individual characteristics independent of the age of an individual, of its length and weight, and of the content of reserve and bioactive substances in its tissues and blood.

scholarly journals Isolation and characterization of two virulent Aeromonads associated with haemorrhagic septicaemia and tail-rot disease in farmed climbing perch Anabas testudineus

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abhishek Mazumder ◽  
Hrishikesh Choudhury ◽  
Abhinit Dey ◽  
Dandadhar Sarma
Keyword(s):  
Natural Infection ◽  
Winter Season ◽  
Pcr Amplification ◽  
Body Parts ◽  
Anabas Testudineus ◽  
Climbing Perch ◽  
Isolation And Characterization ◽  
Biochemical Characterisation ◽  
Rot Disease

AbstractDiseased Anabas testudineus exhibiting signs of tail-rot and ulcerations on body were collected from a fish farm in Assam, India during the winter season (November 2018 to January 2019). Swabs from the infected body parts were streaked on sterilized nutrient agar. Two dominant bacterial colonies were obtained, which were then isolated and labelled as AM-31 and AM-05. Standard biochemical characterisation and 16S rRNA and rpoB gene sequencing identified AM-31 isolate as Aeromonas hydrophila and AM-05 as Aeromonas jandaei. Symptoms similar to that of natural infection were observed on re-infecting both bacteria to disease-free A. testudineus, which confirmed their virulence. LC50 was determined at 1.3 × 104 (A. hydrophila) and 2.5 × 104 (A. jandaei) CFU per fish in intraperitoneal injection. Further, PCR amplification of specific genes responsible for virulence (aerolysin and enterotoxin) confirmed pathogenicity of both bacteria. Histopathology of kidney and liver in the experimentally-infected fishes revealed haemorrhage, tubular degeneration and vacuolation. Antibiotic profiles were also assessed for both bacteria. To the best of our knowledge, the present work is a first report on the mortality of farmed climbing perch naturally-infected by A. hydrophila as well as A. jandaei, with no records of pathogenicity of the latter in this fish.

Reproductive cycle of the Manila clam (Ruditapes philippinarum): an intensively harvested invasive species in the Tagus Estuary (Portugal)

2017 ◽  
Vol 98 (7) ◽  
pp. 1645-1657 ◽  
Author(s):  
Paula Moura ◽  
Paulo Vasconcelos ◽  
Fábio Pereira ◽  
Paula Chainho ◽  
José Lino Costa ◽  
...  
Keyword(s):  
Invasive Species ◽  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Ruditapes Philippinarum ◽  
Manila Clam ◽  
Tagus Estuary ◽  
Gonad Maturation ◽  
Oocyte Diameter ◽  
Ruditapes Decussatus ◽  
Spawning Period

The present study aimed to describe the reproductive cycle and estimate the size at sexual maturity of the Manila clam (Ruditapes philippinarum) in the Tagus Estuary (Portugal). Specimens were collected monthly from September 2013 to December 2015 during fishing surveys using bivalve dredges. The gametogenic cycle was described in detail using gonad histology and monitored throughout the study period by the monthly variation in the frequency of gonad maturation stages, mean gonadal index and mean oocyte diameter. This invasive population of R. philippinarum displayed synchronous gonadal development between sexes, with ripening occurring mainly in April and May followed by an extensive spawning period until November–December. Individuals reached the size at first sexual maturity at 29.4 mm in shell length (i.e. before 1 year old). Furthermore, the reproductive strategy, dynamics and potential were compared between the invasive R. philippinarum and the native congeneric carpet shell clam (Ruditapes decussatus). Overall, the data gathered in this study constitutes valuable baseline information to propose conservation strategies and implement management measures to minimize the harmful impacts caused by this invasive species on local ecosystems and native biodiversity, particularly over populations of autochthonous bivalves.

scholarly journals ASDToolkit: A Novel MATLAB Processing Toolbox for ASD Field Spectroscopy Data

2020 ◽  
Author(s):  
Kathryn Elmer ◽  
Raymond Soffer ◽  
J. Pablo Arroyo-Mora ◽  
Margaret Kalacska
Keyword(s):  
Individual Characteristics ◽  
Atmospheric Conditions ◽  
Current Effort ◽  
Data Product ◽  
Field Spectroscopy ◽  
The Individual ◽  
Solar Position ◽  
Derived Data

Over the past 30 years, the use of field spectroscopy has risen in importance in remote sensing studies for the characterization of the surface reflectance of materials in situ within a broad range of applications. Potential uses range from measurements of individual targets of interest (e.g. vegetation, soils, validation targets etc.), to characterizing the contributions of different materials within larger spatially-mixed areas as would be representative of the spatial resolution captured by a sensor pixel (UAV to satellite scale). As such, it is essential that a complete and rigorous assessment of both the data-acquisition procedures, and the suitability of the derived data product be carried out. The measured energy from solar-reflected range spectroradiometers is influenced by the viewing and illumination geometries and the illumination conditions which vary due to changes in solar position and atmospheric conditions. By applying corrections, the estimated absolute reflectance (Rabs) of targets can be calculated. This property is independent of illumination intensity or conditions and is the metric commonly suggested to be used to compare spectra even when data are collected by different sensors or acquired under different conditions. By standardizing the process of estimated Rabs, as is provided in the described toolkit, consistency and repeatability in processing are ensured and the otherwise labor intensive and error-prone processing steps are streamlined. The resultant end data product (Rabs) represents our best current effort to generate consistent and comparable ground spectra which have been corrected for viewing and illumination geometries as well as other factors such as the individual characteristics of the reference panel used during acquisition.

Characterization of Individuals in Thucydides’ History

2017 ◽  
Author(s):  
Philip Stadter
Keyword(s):  
Individual Characteristics ◽  
And Behaviors

Thucydides presents the words and deeds of individuals chiefly in terms of their importance for understanding the war. He characterizes leading actors through their speeches, indications of motivation, authorial comments, and the narrative itself. These techniques allow remarkable nuance, even ambiguity, of interpretation. This chapter examines the representations of Pericles, Nicias, Alcibiades, Brasidas, and Thucydides himself, highlighting the similar and contrasting traits that unite them. In Thucydides’ narrative, Pericles’ pride in Athens, refusal to yield to Sparta, and brilliant oratory lead Athens into the war. Nicias evaluates the expedition to Sicily with Periclean prudence, but his fear of a change in fortune and of the Athenian assembly lead to the expedition’s defeat. Alcibiades shares Pericles’ aristocratic background and strategic imagination, but his self-centeredness and contempt for customs twice cause the Athenians to lose trust. Through delineating these individual characteristics and behaviors, Thucydides clarifies the war's narrative.

scholarly journals Structure from Motion Multisource Application for Landslide Characterization and Monitoring: The Champlas du Col Case Study, Sestriere, North-Western Italy

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2364 ◽  
Author(s):  
Martina Cignetti ◽  
Danilo Godone ◽  
Aleksandra Wrzesniak ◽  
Daniele Giordan
Keyword(s):  
Structure From Motion ◽  
Winter Season ◽  
Cost Effective ◽  
Point Clouds ◽  
Slope Instability ◽  
Ski Resorts ◽  
Area Of Interest ◽  
3D Point Clouds ◽  
North Western

Structure from Motion (SfM) is a powerful tool to provide 3D point clouds from a sequence of images taken from different remote sensing technologies. The use of this approach for processing images captured from both Remotely Piloted Aerial Vehicles (RPAS), historical aerial photograms, and smartphones, constitutes a valuable solution for the identification and characterization of active landslides. We applied SfM to process all the acquired and available images for the study of the Champlas du Col landslide, a complex slope instability reactivated in spring 2018 in the Piemonte Region (north-western Italy). This last reactivation of the slide, principally due to snow melting at the end of the winter season, interrupted the main road used to reach Sestriere, one of the most famous ski resorts in north-western Italy. We tested how SfM can be applied to process high-resolution multisource datasets by processing: (i) historical aerial photograms collected from five diverse regional flights, (ii) RGB and multi-spectral images acquired by two RPAS, taken in different moments, and (iii) terrestrial sequences of the most representative kinematic elements due to the evolution of the landslide. In addition, we obtained an overall framework of the historical development of the area of interest, and distinguished several generations of landslides. Moreover, an in-depth geomorphological characterization of the Champlas du Col landslide reactivation was done, by testing a cost-effective and rapid methodology based on SfM principles, which is easily repeatable to characterize and investigate active landslides.

scholarly journals Insects as Novel Food: A Consumer Attitude Analysis through the Dominance-Based Rough Set Approach

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 387 ◽  
Author(s):  
Rocco Roma ◽  
Giovanni Ottomano Palmisano ◽  
Annalisa De Boni
Keyword(s):  
Rough Set ◽  
Risk Perceptions ◽  
Decision Rules ◽  
Individual Characteristics ◽  
Market Development ◽  
Human Consumption ◽  
Consumer Attitude ◽  
Regulatory Frameworks ◽  
Production Technologies

In Western societies, the unfamiliarity with insect-based food is a hindrance for consumption and market development. This may depend on neophobia and reactions of disgust, individual characteristics and socio-cultural background, and risk-perceptions for health and production technologies. In addition, in many European countries, the sale of insects for human consumption is still illegal, although European Union (EU) and the European Food Safety Authority (EFSA) are developing regulatory frameworks and environmental and quality standards. This research aims to advance the knowledge on entomophagy, providing insights to improve consumer acceptance in Italy. This is done by carrying out the characterization of a sample of consumers according to their willingness to taste several types of insect-based food and taking into account the connections among the consumers’ features. Thus, the dominance-based rough set approach is applied using the data collected from 310 Italian consumers. This approach provided 206 certain decision rules characterizing the consumers into five groups, showing the consumers’ features determining their specific classification. Although many Italian consumers are willing to accept only insects in the form of feed stuffs or supplements, this choice is a first step towards entomophagy. Conversely, young Italian people are a niche market, but they can play a role in changing trends.

CHARACTERIZATION OF BIOACTIVE SUBSTANCES IN VARIOUS ARTICHOKE VARIETIES

2012 ◽  
pp. 395-400 ◽  
Author(s):  
A. Romo-Hualde ◽  
M.J. Sáiz-Abajo ◽  
A.I. Yetano-Cunchillos ◽  
C. González-Ferrero ◽  
D. Alonso-Santibañez ◽  
...  
Keyword(s):  
Bioactive Substances
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