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Search Results: 1 - 10 of 189873 matches for " HUSZENICZA G. "
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METODELE GENETICII MOLECULARE CA INSTRUMENTE PENTRU AMELIORAREA OVINELOR
JáVOR A.,HUSZENICZA G.,CZEGLéDI L.,áRNYASI MARIANN
Lucrari Stiintifice : Zootehnie si Biotehnologii , 2007,
Abstract: Autorii au prezentat pe scurt proiectele lor de cercetare din ultimii 10 ani ndomeniul geneticii moleculare la oaie. S-au realizat investiga ii asupra receptoruluide melatonin 1a (Mel1A) ca gen candidat care influen eaz sezonalitateareproduc iei la oaie. Cercet rile s-au efectuat pe trei rase, i anume Awassi,Merinos prolific maghiar i igaie. La aceste rase s-au determinat pozi iilemuta iilor genelor n func ie de secven a d referin a GeneBank nr. U14109. ntotal, la cele trei rase s-au identificat un num r de 16 polimorfisme nucleotidicesingulare (SNP). Exonul II a genei Mel1A este puternic polimorfic. ase din SNPidentifica i produc modific ri ale aminoacizilor din proteina care poate fi cauzamodific rilor func iei i/sau construc iei receptorului de melatonin . Studiul se vacontinua pentru a investiga cele trei rase pentru muta iile func ionale, construireade haplotipuri i asocierile dintre haplotipuri i activitatea ovarian extrasezon. Oalt abordare o reprezint studiul de caz a programului maghiar de ameliorarefolosind berbeci importan i din rasa Booroola. n Europa, Ungaria a fost prima ar care a importat berbeci i oi din rasa Merinos Booroola, pe baza c rora s-a formato nou ras Merinos Prolific Maghiar, recunoscut n 1992. n concluzia studiilor depan acum, rezultatele au ar tat c rata ridicat de ovula ie la cast ras esteprodus de muta ia receptorului genei BMPR-1B. Eficien a programului deameliorare dea cre te frecven a alelei FecB n aceast popula ie de ovine a fost ntarziat de aplicarea anterioar a metodelor improprii de clasificare genotipic .Un proiect mai amplu al echipei de cercet tori este acela de a estima diferen elegenetice dintre variatele tipuri de oi igaie i urcan din Estul, Centrul i SudulEuropei. n prezent, n cadrul institutului se deruleaz urm toarele proiecte decercetare: cartografierea locilor nsu irilor cantitative pentru produc ia de lapte dincromozomul 6 la rasa Awassi; polimorfismul genelor proteinei din lapte la rasa igaie; determinarea genotipurilor Callipyge la popula ia SuffolkMaghiar; ncruci area raselor de ovine de lan pentru a produce ovine pentru p r.
The plasma levels of triiodothyronine, thyroxine and cortisol in newborn calves
Stoji? Velibor,Nikoli?-Judith Anna,Huszenicza Gy,?amanc Horea
Acta Veterinaria , 2002, DOI: 10.2298/avb0203085s
Abstract: The aim 'of this investigation was to determine the concentrations of triiodothyronine (T3), thyroxine (T4) and cortisol in blood plasma from calves during the first 32 h of postnatal life, as well as at 7 days old. The experiment involved two groups of calves. The first group was offered the standard amount of colostrum while the second group received half the recommended amount. The results obtained showed that the calves were born with high plasma concentrations of 73, 74 and cortisol up to four times greater than values found at 7 days old. In the calves given the full ration of colostrum there was a gradual increase of mean 73 concentration to levels which plateaued from 8 to 28 h after birth, while the level of T4 increased slightly but significantly up to 18 h. Sharp highly significant increases in 73 and 74 concentrations were observed during the first 4 h of postnatal life in the group of calves given half the usual amount of colostrum to levels which persisted up to 20 h. Except at 4 and 20 h there were no significant differences between the groups. At 7 days old the levels of plasma 73 and 74 in both groups of calves were within the limits found for adult animals. The plasma concentrations of cortisol decreased during the first 18 h afterbirth in both groups of calves and then increased somewhat. At 32 h the mean concentration was higher in group two than in group one. At 7 days old cortisol concentrations were up to four times lower than the level immediately after birth. It was concluded that a decrease in the amount of colostrum consumed had only minor effects on the plasma concentrations of the examined hormones in neonatal calves.
Postpartum resumption of cyclic ovarian function, first estrus and re-conception and their relation to energy metabolism in high-producing dairy cows
Huszenicza Gyula,Kulcsar M.,Katai L.,Balogh O.
Veterinarski Glasnik , 2004, DOI: 10.2298/vetgl0402009h
Abstract: In the last few decades a continuous increase was observed in average milk production of dairy cows all over the world. Simultaneously, however, a dramatic decrease was seen in reproductive performance. This tendency is attributed to the increased incidence of bacterial complications in uterine involution, as well as to the high occurrence of ovarian malfunctions in the postpartum period. The aim of this paper is to review the physiology and pathology of the latter, really complex phenomenon. The nutritional basis of this process, that the requirements of high-producing dairy cows shift abruptly after parturition as the daily milk yield rapidly increases and the ensuing negative energy balance (NEB) will extend 10-12 weeks. In the context of the high genetic merit dairy cow, the pp NEB is the difference between the dietary intake of utilizable energy and the expenditure of energy for body mass maintenance and milk synthesis. In principle, it is a physiological phenomenon, which may, however, result in more or less severe disorders in both the metabolism and reproduction and so it may lead to great economic losses in modern dairy practice [112]. In the first 3-4 weeks after calving the NEB is highly correlated with both milk yield and the interval to first ovulation. Because the number of ovulatory estrous cycles preceding the insemination (AI) has been shown to influence the conception rate, the length of the pp interval to first ovulation provides an important parameter for assessing the effect of NEB on reproductive performance 19, 201.
Adrenocortical and thyroid function, hormone and metabolite profiles and the onset of ovarian cyclicity in dairy cows suffering from various forms of ketosis
Huszenicza Gyula,Kulcsár M.,Kóródi P.,Bartyik J.
Acta Veterinaria , 2006, DOI: 10.2298/avb0601025h
Abstract: The involvement of adrenocortical and thyroid hormones in the pathogenesis of ketosis, as well as the ovarian consequences of this metabolic disorder, were studied in _2 parity cows (n=199) in 3 large scale dairy herds. To compare the plasma/serum concentrations of certain hormones cortisol, thyroxin (T4), triiodothyronine (T3), insulin, insulin-like growth factor-1 (IGF-1)1 and metabolites glucose (G), acetoacetic acid (ACAC), βOH-butyrate (BHB), non-esterified fatty acid (NEFA), trigliceride (TG), total cholesterol (TCh)1, and the activity of aspartate aminotransferase (AST), blood samples were taken 1 to 3 days after calving and again 4 times 7 days apart. The ACTH-challenged cortisol responsiveness and the TRH-induced T4/T3 increase were determined between days 1 to 3 and again between days 28 to 35. The resumption of ovarian cyclicity was followed up by individual progesterone (P4) profiles based on milk samples taken 3 times a week for about 80 to 85 days. BHB level of 1 mmol/L was estimated as a border line between hyper- (>1 mmol/L) and normoketonaemic (<1 mmol/L) conditions. Five different ketone patterns were distinguished: (1) non-ketotic (n=98; normoketonaemia in all samples), (2) early type ketosis (n=45; hyperketonemia was detected only in the first week after calving), (3) late type (lactational) ketosis (n=11; after a normoketonaemic period increasing hyperketonaemia was detected in the 5th, or in the 4th and 5th weeks), (4) temporary ketosis (n=11; hyperketonaemia was detected for 1-2 weeks in the 2nd and 3rd or in the 3rd and 4th weeks); (5) long-lasting ketosis (n=34; hyperketonaemia has been detected since calving for 4 to 5 weeks or until dying / emergency slaughtering). Simultaneously with the hyperketonaemic stage increased NEFA, ACAC, depressed TCh, glucose and decreased insulin, IGF-1, T4 and T3 concentrations were detected in almost all the cases. Obvious metabolic and endocrine alterations were found, however, only in long-lasting ketosis. The TRH-stimulated T4 and T3 responses remained almost unaffected proving intact thyroid function in early and late type as well as in temporary ketosis. Depressed thyroid response and delayed onset of cyclic ovarian function were detected only in cases of long-lasting ketosis. The cows characterized by lower than normal (
A Characterization of the Members of a Subfamily of Power Series Distributions  [PDF]
G. Nanjundan
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.26099
Abstract: This paper discusses a characterization of the members of a subfamily of power series distributions when their probability generating functions satisfy the functional equation where a, b and c are constants and is the derivative of f.
Double Negative Left-Handed Metamaterials for Miniaturization of Rectangular Microstrip Antenna  [PDF]
G. Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.26044
Abstract: In this paper, I have explored a significant concept for the miniaturization of microstrip patch antenna configuration by using the double negative (DNG) left-handed Metamaterials, which have dielectric permittivity and magnetic permeability both negative, simultaneously. It is achieved through the concept of phase-compensation by thin slab consist of the double positive (DPS) material, which have dielectric permittivity and magnetic permeability both positive, simultaneously and DNG metamaterials as a substrate of the microstrip patch antenna. By combining the DNG metamaterial slab with the slab made of DPS materials form a cavity resonator whose dispersion relation is independent of the sum of thickness of the slabs filling this cavity but it depends on the ratio of their thicknesses. This cavity constitutes by DPS and DNG material is used as substrate of the microstrip antennas and the DNG material slab is behave as phase compensator.
Dynamic and Configurational Approach to the Glass Transition by Nanoscale Cooperativity  [PDF]
G. Romeo
Open Journal of Biophysics (OJBIPHY) , 2012, DOI: 10.4236/ojbiphy.2012.23012
Abstract: Here we examine the findings obtained for disaccharide/water mixtures near glass transition that involves cooperative relaxation features on kinetic by viscosity and on thermodynamic behaviour by neutron scattering. Then to address cooperative phenomena that mitigate the Debye-Waller behaviour we invoke Adam-Gibbs’ idea of a cooperative rearranging region. Neutron results suggest that the excess mean square displacement behaves as free volume and is closely connected to an elementary step of the structural relaxation. Then viscosity data evidence a breakdown of the Einstein-Debye relation, decoupling attributed to the intermolecular cooperativity.
Confidence Level Estimator of Cosmological Parameters  [PDF]
G. Sironi
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329157
Abstract: Cosmological Models frequently suggest the existence of physical, quantities, e.g. dark energy, we cannot yet observe and measure directly. Their values are obtained indirectly setting them equal to values and accuracy of the associated model parameters which best fit model and observation. Apparently results are so accurate that some researchers speak of precision cosmology. The accuracy attributed to these indirect values of the physical quantities however does not include the uncertainty of the model used to get them. We suggest a Confidence Level Estimator to be attached to these indirect measurements and apply it to current cosmological models.
Mitochondrial DNA sequence analysis in Anabantoidei fish  [PDF]
G. Degani
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.33039
Abstract:

The decline of ornamental fish populations in their native habitats due to over-fishing has brought about the development of ornamental fish aquaculture, to which fish of the Anabantoidei suborder are important contributors. The genetic variations among species of this suborder were examined by mitochondrial gene sequencing analysis using the cytochrome b and 12S genes. According to the cytochrome b gene, the most similar strains were Trichogaster trichopterus (gold) and Trichogaster trichopterus (blue) (100%). Trichogaster leerii was less similar to them (86.0%), and an even lower similarity was found between the species T. trichopterus and Trichogaster labiosus (85.6%). The least similarity was observed between Betta betta and the genera Colisa (50.2%) and Trichogaster (60.1%). The phylogenetic trees of 12S and cytochrome b were very similar. According to 12S, the similarity between Trichogaster species was high (91.4% - 100%), and between species of this genus and Colisa lalia, it was lower (88.4%). In conclusion, sequence analyses, based on cytochrome

Estimation of Parameter in a New Truncated Distribution  [PDF]
G. Nanjundan
Open Journal of Statistics (OJS) , 2013, DOI: 10.4236/ojs.2013.34025
Abstract: This paper discusses the estimation of the parameter in a truncated form of a discrete distribution which is analogous to Burr distribution. The maximum likelihood and the moment estimators of the parameter are obtained. Their asymptotic properties are also established.
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