oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

3 ( 1 )

2019 ( 47 )

2018 ( 317 )

Custom range...

Search Results: 1 - 10 of 268293 matches for " Maria P. Ikonomopoulou "
All listed articles are free for downloading (OA Articles)
Page 1 /268293
Display every page Item
Hormone and Metabolite Profiles in Nesting Green and Flatback Turtles: Turtle Species with Different Life Histories
Maria P. Ikonomopoulou,Adrian J. Bradley,Kammarudin Ibrahim,Colin J. Limpus,Manuel A. Fernandez-Rojo,Dimitrios Vagenas,Joan M. Whittier
Advances in Zoology , 2014, DOI: 10.1155/2014/503209
Abstract: Herbivorous turtle, Chelonia mydas, inhabiting the south China Sea and breeding in Peninsular Malaysia, and Natator depressus, a carnivorous turtle inhabiting the Great Barrier Reef and breeding at Curtis Island in Queensland, Australia, differ both in diet and life history. Analysis of plasma metabolites levels and six sex steroid hormones during the peak of their nesting season in both species showed hormonal and metabolite variations. When compared with results from other studies progesterone levels were the highest whereas dihydrotestosterone was the plasma steroid hormone present at the lowest concentration in both C. mydas and N. depressus plasma. Interestingly, oestrone was observed at relatively high concentrations in comparison to oestradiol levels recorded in previous studies suggesting that it plays a significant role in nesting turtles. Also, hormonal correlations between the studied species indicate unique physiological interactions during nesting. Pearson correlation analysis showed that in N. depressus the time of oviposition was associated with elevations in both plasma corticosterone and oestrone levels. Therefore, we conclude that corticosterone and oestrone may influence nesting behaviour and physiology in N. depressus. To summarise, these two nesting turtle species can be distinguished based on the hormonal profile of oestrone, progesterone, and testosterone using discriminant analysis. 1. Introduction Hormones have various functions across animal taxa. In birds, for example, testosterone is linked to mating success, while corticosterone has been shown to support energetically demanding processes [1]. In vertebrates glucocorticoid hormones can assist in the modulation of life-history events, survival probabilities, and fecundity [2]. Similarly steroid hormones play an essential role in the reproductive behaviour and sexual development in marine turtles [3]. Sex determination in sea turtles is regulated by incubation temperatures and by exogenous steroid hormones [4, 5]. In addition to determining sex, steroids have also been causally related to various physiological and behavioural actions in sea turtles. For example, corticosterone and testosterone have been associated with hepatic regulation and ovarian function during nesting activities in Caretta caretta [6–8]. Corticosterone concentration decreases when a turtle is subjected to stress or drops to low levels when a female turtle is breeding [9–11]. Nesting Lepidochelys olivacea during arribadas (mass nesting behaviour) maintain low corticosterone level as a mechanism of
Discounting future pain: Effects on self-reported pain  [PDF]
Pablo Bra?as-Garza, Maria P. Espinosa, Maria Repolles Pro
Neuroscience & Medicine (NM) , 2010, DOI: 10.4236/nm.2010.11002
Abstract: Empirical results are presented showing that people who acknowledge pain anticipation when expecting an injury experience higher sensitivity to pain (GREP, Robinson et al., 2001). The positive correlation between sensitivity and anticipation is highly significant. However, no relationship is found between anticipation and pain endurance.
The effect of acculturation in the concordance of oral health related quality of life in Latino children and their parents  [PDF]
Yltze P. Cubas, Maria F. Orellana
Open Journal of Epidemiology (OJEpi) , 2013, DOI: 10.4236/ojepi.2013.32016
Abstract:

The Latino population is the fastest growing and the largest minority group in the United States comprising 16% of the population younger than 18 years of age. Yet, little is known about the effect of acculturation in oral health related quality of life in Latino children and their parents. Objective: The objective of this study was to assess the effect of acculturation in parent and child’s perceptions of the child’s oral health status and oral health related quality of life (OHRQoL) as well as the effect in the concordance between children and parents/caregivers. Method: Sixty-three Latino children between the ages of 8 and 15, and their parents were recruited from the waiting room at the University of California, San Francisco Orthodontic and Pediatric Clinics. Parent and children each separately completed the Child Oral Health Impact Profile questionnaire (COHIP) for children and COHIP for parent/caregiver. Results: Of the sixty-three children, fifteen children (23.8%) had a more negative perception of their oral health than their parents whereas twenty-three children (36.5%) had a more positive perception. In terms of agreement between children and parents, questions about oral health showed the lowest level of agreement (34.9%) and self-image questions the highest (55.6%). Conclusion: The study findings indicate that the more acculturated the child, the more negative their perception of their oral health. The level of disagreement between parent and child, underscores the importance of obtaining both the child and parent OHRQoL perceptions.

Differential Effect of Unilateral Amygdalar GABAA Receptor Agonist Injection on Low- and High-Anxiety Rats  [PDF]
Maria P. Rysakova, Irina V. Pavlova
Journal of Behavioral and Brain Science (JBBS) , 2016, DOI: 10.4236/jbbs.2016.61002
Abstract: The influence of γ-aminobutyric type-A (GABAA) receptors agonist (muscimol hydrobromide, 0.1 μg/0.5 μl) injections into the right or left basolateral amygdala (BLA) on the behavior of high-anxiety (HA) and low-anxiety (LA) rats subjected to the elevated plus-maze (EPM) test was investigated. Anxiolytic-like effects (increase of open-arm entries and open-arm time) was revealed only after administration of muscimol into the left (but not right) amygdala of HA animals. No effect was observed upon administration of muscimol to LA rats. These findings suggest an important role in anxiety regulation of the amygdalar GABA levels, and the assumed GABA hemispheric lateralization.
On the Distribution of the Minimum or Maximum of a Random Number of i.i.d. Lifetime Random Variables  [PDF]
Francisco Louzada, Estela M. P. Bereta, Maria A. P. Franco
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.34054
Abstract: Statisticians are usually concerned with the proposition of new distributions. In this paper we point out that a unified and concise derivation procedure of the distribution of the minimum or maximum of a random number N of indepen-dent and identically distributed continuous random variables Yi,{i = 1,2,…,N} is obtained if one compounds the probability generating function of N with the survival or the distribution func-tion of Yi. Expressions are then derived in closed form for the density, hazard and quantile func-tions of the minimum or maximum. The methodology is illustrated with examples of the distributions proposed by Adamidis and Loukas (1998), Kus (2007), Tahmasbi and Rezaei (2008), Barreto-Souza and Cribari-Neto (2009), Cancho, Louzada, and Barriga (2011) and Louzada, Roman and Cancho (2011).
Apresenta o
Leopoldi Maria Antonieta P.
Revista de Sociologia e Política , 2002,
Abstract:
Mistura enantiomérica da bupivacaína, a obviedade estereoisomérica
Simonetti Maria P. B.
Revista Brasileira de Anestesiologia , 2003,
Abstract:
GC-MS ANALYSIS OF LANTANA CAMARA L LEAVES
P. Maria jancy rani
International Journal of Pharmaceutical Research and Development , 2011,
Abstract: The investigation was carried out to determine the possible chemical componentsLantana camara L leaves GC-MS. GC-MS analysis of ethanol extract led to identification of 18 compounds. This analysis revealed that contains Lantana camara L leaves mainly Betulin, squalene, Phytol.
O fazer metodológico na educa o de jovens e adultos: a prática no projeto educativo de integra o social – PEIS/The methodological doing in the young and adults education...
Maria Fernanda P. Turina
ETD : Educa??o Temática Digital , 2008,
Abstract: TURINA, M. F. P. O fazer metodológico na educa o de jovens e adultos: a prática no projeto educativo de integra o social – PEIS. 108fl. 2008. Disserta o (Mestrado em Educa o) – Faculdade de Educa o, Universidade Estadual de Campinas, Campinas. 2008.
Proteins from Punctularia atropurpurascens with Biotechnological Applications  [PDF]
Silvana Alborés, Maria José Bustamante, Laura Franco Fraguas, Maria Pía Cerdeiras
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.515078
Abstract: Basidiomycetes are able to biodegrade waste and xenobiotic molecules through the production of extracellular enzymes. For example, white-rot fungi produce lignin-degrading enzymes which are capable of efficiently decolorizing dye solutions. Many mushrooms also produce lectins, a group of proteins which bind specifically to the carbohydrates in glycoconjugates. Several fungal lectins target their specificities towards oligosaccharides present in mammalian glycoproteins, thus constituting excellent ligands for the preparation of affinity adsorbents useful in isolation and characterization of these glycoproteins. In this study we isolated and characterized two different proteins, a lectin and a laccase, present in extracts from Punctularia atropurpurascens. The lectin isolated from the mycelium extract, was immobilized on activated-Sepharose and used to evaluate the interaction with three glycoproteins. The adsorbent was able to efficiently adsorb and elute bovine lactoferrin, constituting a promising tool for the purification of this glycoprotein. In vitro experiments revealed that the lectin also exhibited antimicrobial activity against Aspergillus niger. Laccase activity was detected in the extracellular extract from P. atropurpurascens. This enzyme, in both soluble and immobilized forms, was able to degrade Remazol Brilliant Blue R and Acid Blue 25 dyes. The biological activities found in this fungus demonstrate its potential for various biotechnological applications.
Page 1 /268293
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.