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Search Results: 1 - 10 of 5066 matches for " Gabriela Neacsu "
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Modification of some biochemical parameters and of the concentration of some serum ions in Cyprinus carpio L. species grown under different sanitary-veterinary conditions
Costica Misaila,Ion Neacsu,Elena Rada Misaila,Gabriela Vasile
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2008,
Abstract: The paper discusses the modifications produced in some biochemical indices as well as in the concentration of serum ions, in fry carp, during the period of active feeding, in two experimental ponds of the Iasi district, providing different conditions of ichtyo-pathological prevention. The average values of glucose and alkaline phosphatase from the blood, as well as those of cholesterol, ureic nitrogen, Na+, Ca2+ and K+ from the serum, have been determined after 120 days of experiment (June - September), for 11 representatives of each basin. For the two experimental variants, different preventive treatments - based on calcium chloride administered in three different moments of the growing cycle and on concentrated, drug-containing food for assuring antimicrobial prevention - have been applied. The values recorded in the variant under analysis are lower than those of the reference, with 12.2% for glycemy, 9.7% for total cholesterol, 17.5% for the total ureic nitrogen and 10.98%, respectively, for alkaline phosphatase. The levels of the determined ions show higher values in the experimental variant, with 23.3% for K+ and 4.1%, respectively, for Ca2+, while the average values for Na+ are lower in the fish from variant B, the Na+/K+, Na+/Ca2+ and (Na++K+)/Ca2+ ratios showing inferior values - with 4 - 21% - than the reference ones.
Influence of the antiectoparasitary treatment on cellular respiration of some cultured cyprinid species
Ion Neacsu,Costica Misaila,Elena-Rada Misaila,Gabriela Dumitru
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2009,
Abstract: : The study discusses the influence of a preventive treatment against ectoparasites on the intensity of cellular respiration in three, 3 summer-old cultured cyprinid species, namely: common carp (Cyprinus carpio), silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis). The cellular consumption of oxygen (μLO2/g fresh tissue) in muscles and gills was determined by the Warburg microrespirometric method, on two batches of fish from each species, namely: a reference (untreated) batch and a batch treated against ectoparasites. The results obtained show that the intensity of the cellular consumption of oxygen differs - as a function of the treatment applied, fish species, cellular type and duration of recordings. Therefore, generally speaking, cellular respiration is more intense in gills than in muscles, in both types of batches: treated and untreated. Lower values are registered in common carp, followed, in increasing order, by those recorded in silver carp and bighead carp. The antiectoparasitary treatment has positive effects, intensifying cellular respiration, along with metabolism stimulation and an improved general physiological condition of fis
On the cellular respiration of some culture cyprinids exposed to wintering
Ion Neacsu,Costica Misaila,Elena Rada Misaila,Gabriela Vasile
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2008,
Abstract: The influence of the wintering conditions on the intensity of cellular respiration was followed on three fish (cyprinids) species, namely: common carp (Cyprinus carpio), silver carp (Hypophthalmichthys molitrix) and bighead carp (Aristichthys nobilis). The intensity of the cellular oxygen consumption was determined by the Warburg microrespirometric method, both in gills and muscles, prior to (beginning of December) and after the winter stay (end of March). Certain variations in the intensity of the cellular respiration were recorded, as a function of fish species, type of cells, season and duration of observation. It was noticed that, generally, in December, the intensity of cell oxygen consumption takes higher values in the common carp, comparatively with the other species, as well as in gills, versus muscle. At the same time, under the influence of the low temperature and of the other conditions specific to the cold season, some reduction in the intensity of cell respiration may be noticed, in both tissues and in all three fish species, which is nevertheless more intense in the case of common carp so that, by March, it records lower values than the other two Asian species, situation which may be correlated with their different mode of living and their different energetic requirements.
THE EFFECTS OF SOME PESTICIDES ON THE CARDIAC ACTIVITY IN FROG (Rana ridibunda Pall.)
Adela Tufeanu,Ion Neacsu,Costica Misaila,Gabriela Dumitru
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2012,
Abstract: The paper analyses the experimental results on the effects of various doses of Oleokalus insecticide (0.15, 0.75and 1.5 mg%), Oltisan herbicid (0.25, 1 and 2 mg%) and Tilt fungicide (0.25, 1 and 3 mg%) upon the isolated heart offrog (Rana ridibunda Pall.) perfused with a Ringer physiological solution. The doses, similar to those applied inagricultural practice, are considered as non-toxic for the environment (Baicu, 1979). The mechano-cardiogramsperformed showed that all pesticides under analysis cause depression in the cardiac activity of frog, its intensity andpersistence depending on the substance and dose applied. The maximum remanent cardio-inhibiting effects are inducedby fungicide Tilt.
THE SIMULATION OF THE IMPACT OF THE POLLUTION FACTORS ON THE PHYSICAL AND CHEMICAL PARAMETERS OF THE AIR QUALITY ALONG THE ROMANIAN COAST OF BLACK SEA USING NEURAL MODELS.
Nicolae Tudoroiu,,Gabriela Neacsu,,Tiberiu Letia,,Nicolae Ilias
International Journal of Computer Science & Applications , 2010,
Abstract:
FROM RIBOSOMES TO CELLULAR AND MOLECULAR BIOLOGY, WITH GEORGE EMIL PALADE
Ion Neacsu
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2004,
Abstract:
ADRENALINE EFFECT ON THE ACTIVITY OF CARDIAC CELLS
Ion Neacsu,Dorina Creanga
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2005,
Abstract: The increased content of adrenaline in emotionally stressed people is known as a major source of heart beat acceleration. Using the electrocardiographic recordings (ECG) the influence of the adrenaline on the electric activity of heart muscle cells has been indirectly investigated. Physiologically normal and emotional loaded voluntary human subjects have been studied. Computationally tests based on the Hurst exponent and the capacity dimension have been used to get numerical data able to make the difference between the two physiological situations. While Hurts exponent led to similar values in both situations the capacity dimension has provided higher values for correspondingly higher adrenaline content indicating higher complexity in the electric activity of emotional subjects heart
ELECTROMAGNETIC FIELDS INFLUENCE ON THE RAT PLASMATIC IONIC CONTENT
Calin Maniu,Ion Neacsu
Analele ?tiin?ifice Ale Universit??ii Alexandru Ioan Cuza din Ia?i,Sectiunea II A : Genetica si Biologie Moleculara , 2004,
Abstract:
The magnetic field of the relativistic stars in the 5D approach
Maria C. Neacsu
Physics , 1999,
Abstract: It is well-known that the 5D equations without sources may be reduced to the 4D ones with sources, provided an appropriate definition for the energy-momentum tensor of matter in terms of the extra part of the geometry.The advantage consists on the naturally appearance of gravitational and electromagnetic fields from this decomposition. With this ansatz an algorithm is presented, which permits to express the physical parameters in terms of gauge potentials and scalar field. An explicit form for the exterior magnetic field of neutron star in terms of the scalar field and the gauge potentials is deduced for a static, spherically-symmetric metric.
A Magnetic Mass Model within the General Relativity Framework
Maria Cristina Neacsu
Physics , 1999,
Abstract: In this paper is presented a general-relativistic approach of cuasi-neutral bodies endowed with magnetic field. Starting from the similarity of neutron particles with neutron stars for which the general-relativistic framework is imposed, this treatment is extended to neutrons. A class of interior solutions is derived from the Einstein field equations for a spherically-symmetric distribution of a perfect magneto-fluid in the magnetohydrodinamic approximation and a magnetic mass model is proposed. The dependence of the metric and of physical parameters on the magnetic field leads to the conclusion that the mass is entirely magnetic in origin, which implies that the field equations do not admit interior solutions if the source consist only on perfect fluid.
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