Fetecau C.,Technical University Gheorghe Asachi |
Imran M.,Salam University |
Burdujan I.,University of Agricultural Sciences and Veterinary Medicine, Iasi
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2010
Exact solutions corresponding to the unsteady helical flow of an Oldroyd-B fluid due to an infinite circular cylinder subject to torsional and longitudinal time-dependent shear stresses are established using Hankel transforms. These solutions, presented under series form in terms of Bessel functions J0(·), J1(·) and J2(·), can be easily specialized to give the similar solutions for Maxwell, Second grade and Newtonian fluids performing the same motion. Some characteristics of the motion, as well as the influence of pertinent parameters on the velocity profiles, are underlined by graphical illustrations. © 2009 Birkhäuser Verlag Basel/Switzerland.
Bucur R.D.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Harja M.,Technical University Gheorghe Asachi
Environmental Engineering and Management Journal | Year: 2012
This paper presents an experimental study on the energy requirement for greenhouse heating. The evaluation of necessary energy for crop plants was made by systematic measurements of the thermal behavior for three non heated tunnel greenhouses, covered with polyethylene. From the comparative analysis of the measured temperatures inside and outside the tunnel, it was established the relationship for estimating the inside greenhouse average temperature (tmi), lower than the minimum temperature necessary for growing of a certain specie of flowers or vegetables. Using statistical regression series it was developed the relationship for the duration (T) in which the temperature inside the greenhouse drops below a preset value. Using these pairs of values (tmi and T) it was estimated the energy requirements so as to maintain a temperature which exceedes a certain minimum value (tc) inside to the greenhouse. Applying this algorithm, it was set the amount of thermal energy (E) necessary to be provided in the greenhouse in order to maintain the temperature to a predetermined level during night. By processing the recorded temperatures at some weather stations in Romania, it was possible to establish how much energy is needed in each locality analyzed so as to ensure the required heat level inside of this type of greenhouses. The interpolation of resulted values would allow the land zoning at the level of the national territory depending on the availability of natural energy.
Agency: European Commission | Branch: H2020 | Program: BBI-RIA | Phase: BBI.VC3.R8-2015 | Award Amount: 4.92M | Year: 2016
The Andes Lupin (Lupinus mutabilis, tarwi) grows excellently in marginal lands due to its excellent foraging characteristics having the ability to fix nitrogen, mobilise soil phosphate and have low nutritional requirements for cultivation. For the increased biomass needed in Europe in coming years and decades we cannot rely on the most fertile lands, which is currently allocated to food production, we need to increase the yield from marginal lands. There the lupin varieties are preponderant, the one providing highest yield (up to 80 ton/ha) is Lupinus mutabilis. Varieties can be chosen for giving this high yield of green silage or high yield of seeds contain more than 20% oil, more than 40% protein and the remainder carbohydrates are mainly oligosaccharides characterized as prebiotics. Andes lupin can be grown as a summer crop in N-central Europe conditions and as winter crop in Mediterranean conditions. Breeding and cropping research is performed in the LIBBIO project for maximizing the yield and value of lupin agriculture in different European marginal lands conditions, with respect to both the farmers and biorefineries. Pre-industrial processing is developed and optimized for the lupin, properties of the different fractions analysed, their advantage for different industrial use evaluated, and a few products developed as an example. With respect to environmental impact the lupin is expected to be superior. It does not need much fertilizer, it enriches the soil with nitrogen and phosphate and is therefore expected to be excellent for crop rotation and soil regeneration. These properties will be evaluated further in the project along with techno-economic and agricultural viability and effect on farm and biorefinery income.
Tarcau D.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Cucu-Man S.,Al. I. Cuza University |
Boruvkova J.,Masaryk University |
Klanova J.,Masaryk University |
Covaci A.,University of Antwerp
Science of the Total Environment | Year: 2013
Concentrations of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDE) have been determined in soil, mosses and tree bark samples collected from the same locations in North-Eastern Romania (region of Moldavia). PCBs and PBDEs were under the limit of quantification in all investigated samples. OCPs were the principal pollutants found in the analysed samples. In soil, moss and tree bark samples, DDT together with its metabolites, was the most abundant OCP ranging between 4.4-79, 5.8-95 and 11-440ngg-1 in the individual matrices, followed by HCH isomers with levels between 1.1-9.8, 8.9-130 and 12-130ngg-1 in soil, moss and bark respectively. To distinguish between the previous and current pollutant input and preferential biodegradation of DDT metabolites, the degradation ratios were calculated between the parent substances and their metabolites (DDT and HCH isomers). The investigation indicates no important pollution sources near sampling sites and reveals that OCPs originate mainly from long-range air transport processes and through atmospheric deposition of isomers volatilised from secondary sources. Discriminant function analysis was performed to determine whether OCPs uptake differ among the three matrices (soil, moss and tree bark). A good separation was observed between tree bark and the other two matrices. The most redundant variable appears to be p,p'-DDE (R2=0.336), while the most informative variable seems to be o,p'-DDT (R2=0.0361). Significant correlations were found between bark and moss concentrations for most α-HCH and p,p'-DDD (p<0.01). We have also investigated the enantiomeric signature of α-HCH. For bark and moss, EF values suggest preferential degradation of the (-)α-HCH enantiomer. © 2013 Elsevier B.V.
Motrescu I.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Nagatsu M.,University of Shizuoka
ACS Applied Materials and Interfaces | Year: 2016
With respect to microsized surface functionalization techniques we proposed the use of a maskless, versatile, simple tool, represented by a nano- or microcapillary atmospheric pressure plasma jet for producing microsized controlled etching, chemical vapor deposition, and chemical modification patterns on polymeric surfaces. In this work we show the possibility of size-controlled surface amination, and we discuss it as a function of different processing parameters. Moreover, we prove the successful connection of labeled sugar chains on the functionalized microscale patterns, indicating the possibility to use ultrafine capillary atmospheric pressure plasma jets as versatile tools for biosensing, tissue engineering, and related biomedical applications. © 2016 American Chemical Society.
Pasarin B.,University of Agricultural Sciences and Veterinary Medicine, Iasi
AACL Bioflux | Year: 2010
The present paper summarizes the Pricopian theory of sexuality, discussed in the context of fishes' sex determination. On a logical approach and considering the most recent genetic evidences reported from studies on bacteria, invertebrates, fish, frogs, reptiles, birds, mammals and even humans, one may allready abandon the chromosomal concept of the sex determination (such as the dosage of Z chromosomes). The sex-determining locus is not a true locus, but an agglomeration of loci very seldom separated by genetic recombination. Moreover, the W chromosome in ZZ-ZW systems and the Y in XXXY systems are not empty at all, but still carry information.
Bucur D.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Moca V.,University of Agricultural Sciences and Veterinary Medicine, Iasi
Irrigation and Drainage | Year: 2012
This study was carried out to investigate an albic stagnic-glossic Luvosol during three distinct experimental cycles conducted in 1978-1986, 1987-1996 and 1997-2008 to identify changes in properties of the drained soil in response to amendments. After execution of the land shaping in the bedding system the topsoil thickness increased on the ridges when compared to the furrows, resulting in a higher active physiological depth in comparison to the unimproved soil. Additionally, mixing of the material from the upper horizons occurred because of the deep loosening and cultivation of the drained soil, especially at 0-30cm. The upper part of the drained soil profile showed a redistribution of the clay content, which increased by an average of 4% in the 0-20cm horizon when compared to the unimproved soil. Cultivation resulted in intensification of the mineralization process of the humic substances in the drained soil. As a result, the humus content was reduced by 4-5% in the 0-20cm horizon. The evolution of the main physical features of the soil under the long-term influence of the tile drainage and improved cultivation methods revealed an increase in the drained porosity and a reduction of the compaction degree at 0-30cm. These changes primarily occurred after the first experimental cycle, while the soil physical state remained relatively stable in the following experimental cycles. © 2011 John Wiley & Sons, Ltd.
Lipsa F.D.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Snowdon R.,Justus Liebig University |
Friedt W.,Justus Liebig University
Euphytica | Year: 2012
Condensed tannins (proanthocyanidins, PAs) in the seed meal of oilseed rape can potentially have a negative impact on non-ruminant livestock nutrition, particularly because of their ability to form indigestible, astringent or bitter-tasting complexes with proteins. One option to overcome this problem is the breeding of oilseed rape varieties with reduced condensed tannins in the seed coat. This might be achievable via selection of genotypes with thinner seed coats and consequently reduced condensed tannin accumulation (seed coat structural cell mutants), or alternatively by selection of genotypes with reduced biosynthesis of condensed tannins (flavonoid biosynthesis mutants). Both types of transparent testa (TT) mutants are well-characterised in Arabidopsis; however the genetic basis of the yellow-seed trait in the polyploid genome of rapeseed is still not completely understood. In this study, genetic and chemical analyses of PAs were performed in 166 doubled haploid (DH) rapeseed lines from the segregating Brassica napus doubled haploid population YE2-DH (black seed × yellow seed). Using these analyses, the relationship between seed colour and PA fractions in B. napus was investigated with a view to improving the rapeseed meal quality. Proanthocyanidin contents were estimated by vanillin and HPLC assays and the obtained values were used to identify quantitative trait loci. Closely linked molecular markers that were identified during this study for the target traits (seed colour, condensed tannins) can be valuable tools for breeding of new oilseed rape cultivars with reduced levels of antinutritive PA compounds. © 2011 Springer Science+Business Media B.V.
Gilca V.,University of Agricultural Sciences and Veterinary Medicine, Iasi
AACL Bioflux | Year: 2010
The experiment was organized to investigate the recovery of additional food (fodder and terrestrial vegetation) given to fish, Ctenopharyngodon idella, in particular through the study of nutrient digestibility. Studied forage digestibility was determined through laboratory experiments, conducted between June 20 to 30, 2009, using 10 individuals of the species Ctenopharygodon idella from fish farm Movileni, Iaşi. There were formed two experimental groups, each of five individuals per group, differentiation between the two groups was the type of feed used, respectively specific fodder and green clover green mass harvested in bud's phase. To determine organic matter digestibility from feed we used the direct method, which consists in weighing all feed ingested, scrap feed and faeces removed. For this purpose in each aquarium was placed one fish, after which the tanks were covered with netting and set with oxygenation of the water pump. Statistical analysis of the data obtained from the experiment shows that the average values of the coefficients of digestibility of nutrients from fodder and green clover have been very significant differences. If we compare the mean values of digestibility coefficients of organic substances in the two types of forage (green clover and fodder) we can say that the fodder is digested and assimilated better than clover. Thus, in fodder at a protein content of 378.7 g / kg DM (dry matter), there was a digestibility coefficient of 92%, while at a lower protein content of 312.5 g / kg DM, in the case of green clover, the digestibility coefficient was 69%.
Rimbu C.,University of Agricultural Sciences and Veterinary Medicine, Iasi |
Danac R.,Al. I. Cuza University |
Pui A.,Al. I. Cuza University
Chemical and Pharmaceutical Bulletin | Year: 2014
Palladium(II) complexes with Schiff bases ligands derived from salicylaldehyde and amino acids (Ala, Gly, Met, Ser, Val) have been synthesized and characterized by Fourier transform (FT)-IR, UV-Vis and 1H-NMR spectroscopy. The electrospray mass spectrometry (ES-MS) spectrometry confirms the formation of palladium(II) complexes in 1/2 (M/L) molar ratio. All the Pd(II) complexes 1, [Pd(SalAla)2]Cl2; 2, [Pd(SalGly) 2]Cl2; 3, [Pd(SalMet)2]Cl2; 4, [Pd(SalSer)2]Cl2; 5, [Pd(SalVal)2]Cl 2; have shown antibacterial activity against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli. © 2014 The Pharmaceutical Society of Japan.