In a long-term continuous maize experiment set up in 1959, the functional method of growth analysis was applied to investigate the effect of various levels of farmyard manure and mineral fertilisation on the growth of maize (Zea mays L.) and on the dynamics of the growth parameters over a 3-year period (2005–2007). The experiment involved two nutrient levels (based on the active agent equivalence principle): Level l: the NPK equivalent of 35 t ha−1 farmyard manure (FYM), applied in the form of FYM, FYM + mineral fertiliser or mineral fertiliser; Level 2: the NPK equivalent of 70 t ha−1 farmyard manure (FYM), applied in the form of FYM, FYM + mineral fertiliser or mineral fertiliser. The computerised growth analysis program elaborated by Hunt and Parsons (1974) was used to describe the effect of FYM and mineral fertiliser and to evaluate the results. This program fits functions to calculate the absolute growth rate (AGR), the relative growth rate (RGR), the net assimilation rate (NAR) and the leaf area ratio (LAR).The Hunt-Parsons program fitted a third-degree function to the dynamics of total dry matter production and second- or third-degree functions to that of the leaf area growth. The highest mean values of AGR were obtained in treatments with the higher level of mineral fertiliser alone or mineral fertiliser + FYM when the weather was favourable (2.05–2.31 g plant−1 day−1), and in treatments with the lower quantity of mineral fertiliser alone or mineral fertiliser + FYM in the case of dry weather (1.73–1.74 g plant−1 day−1). In 2005 and 2006 the absolute growth rate gave a good characterisation of the various fertiliser effects, which exhibited high values with significant differences, while in 2007 lower AGR values were obtained and no fertiliser effects were observed. In the dry year (2007) the maximum values of NAR and LAR were higher in all the treatments than in the wetter years (except at the lower rate of mineral fertiliser alone). In the case of NAR, the results obtained with the functional method of growth analysis, based on function fitting, were easier to interpret than those obtained using the classical method.It was concluded from the results that in long-term experiments the use of the functional method of growth analysis gave a more precise evaluation of the effects of fertiliser treatments and the year on the growth of maize in the vegetative growth stage and on the mean and maximum values of growth parameters.
This study was performed to assess how magnesium supplementation affects plasma lactate levels at rest and exhaustion in sportsmen and sedentary. Research was performed on 30 healthy subjects varying between 18-22 years of age for a four-week period. Subjects were separated into 3 groups: Group 1; sedentary taking magnesium supplementation only (10 mg/kg/day) (Mg + S), Group 2; subjects magnesium supplemented + training 90-120 min 5 days a week (Mg + Training), Group 3; training 90-120 min 5 days a week. Lactate levels of the groups were measured 4 times; at rest and exhaustion in the beginning of the research and after the end of the research. At the end of the research, exhaustion measurements both before and after supplement were found significantly higher than rest measurements in terms of lactate levels (p<0.05). An important decrease was determined in the lactate levels of the 1 st and 2 nd groups when compared to their first measurements (p<0.05). The results of this research indicate that lactate increases with exhaustion. However, magnesium supplement may positively affect performance of sportsmen by decreasing their lactate levels.
Authors:Andreea Silvia Neamţu, Andrei Biţă, Ion Romulus Scorei, Gabriela Rău, Ludovic Everard Bejenaru, Cornelia Bejenaru, Otilia-Constantina Rogoveanu, Carmen Nicoleta Oancea, Antonia Radu, Cătălina Gabriela Pisoschi, Johny Neamţu, and George Dan Mogoşanu
The main building blocks of nicotinamide riboside (NAR), a pyridine-nucleoside form of vitamin B 3 , are nicotinamide (NA) and ribose. NAR can be found in milk, yeast, and beer but also in bacteria and mammals. NAR
Authors:I. Borbély-Kiss, E. Koltay, S. László, Gy. Szabó, S. Gödény, and S. Seif El-Nars
Elemental concentrations of P, S, Cl, K, Ca, Fe, Ni, Cu, Zn, Br, Rb have been determined in erythrocyte and blood plasma samples from normal and diabetic human pregnancies. Average values, the dependence of the concentrations on the time during gestation period, the correlation coefficients for pairs of elements as well as for the same elements in plasma and erythrocyte samples are given. A marked difference appeared in a number of cases between normal and diabetic pregancies.
Authors:R. Wang, A. Chau, F. Liu, H. Cheng, P. Nar, X. Chen, and Q. Wu
The aim of this paper is to consider using effective natural minerals in studying the retardation and migration of radium under the influence of groundwater in the far-field of a radioactive waste repository. The properties of adsorbing radium by minerals are studied by adopting the static and dynamic adsorption method. Preliminary experimental results give confidence in the validity of using Maifanshih and barite to adsorb radium in water and to serve as effective retarding materials in radioactive waste repositories, their Kd values being 3815 and 2955, respectively. The study on a certain number of conditions of adsorbing radium by the promissing material Maifanshih is reported for the first time. The mechanism of radium adsorption has been discussed and modeling of migration of radium in the minerals has been presented to establish a rational basis for the longterm prediction required for safety assessment of underground disposal of radioactive waste.
The kinetics and equilibria of cation exchange HR+Na+=NaR+H+ with 001×7 strong acidic resin have been studied. The isotherm for this reaction has been determined, and the rational equilibrium constant, Ka, calculated. It is found experimentally that at low concentration, the reverse exchange RNa/H+ is faster than the forward exchange; on the contrary, at high concentration, the forward exchange is faster than the reverse exchange. The integral particle interdiffusion coefficients have been calculated and the film interdiffusion coefficients estimated.
Authors:Tünde Horvát M., Andrea Dúll, and János László
krízisirodalomban konszenzus alakult ki arról, hogy a gyász az egyik legerosebb
krízisprovokáló tényezo. Különösen fontos ez abban az esetben, ha kiterjesztjük
a pszichoanalitikus tárgyvesztés-értelmezés határait a szignifikáns személy
elvesztésén túli eseményekre. Fried
(1963) párhuzamba állította a helyvesztés élményét a fontos személyek
elvesztésének hatására jelentkezo gyásszal. Tanulmányunkban a
lakóhelyveszteséget, pontosabban a szülovároshoz fuzodo helykötodés változását
vesszük górcso alá. A két vizsgálatot Szegeden tanuló, de nem szegedi
származású, határon belüli és határon át lakóhely-változtató egyetemisták
körében végeztük. Tanulmányunk elsodleges célja a migráció következtében
fellépo veszteségélménnyel való megküzdés és a helykötodés vizsgálatára
alkalmazott kvalitatív kutatási stratégia bemutatása. A vizsgálati személyeknek
projektív kérdésekre kellett válaszolniuk, majd a kapott narratívumokat
tartalomelemzésnek vetettük alá, amelyben egy saját kidolgozású
kategóriarendszert alkalmaztunk. Igazolódott az a feltevésünk, mely szerint a
vizsgálati személyek a projektív kérdoívben utalnak a szülováros elhagyása
következtében fellépo veszteségélményre. A határon belüli és határon át
költözok szignifikáns mértékben eltértek a veszteségélménnyel való megküzdés
The use of growth analysis and growth parameters could make an important contribution to improving the utilisation of N fertiliser by maize hybrids. In 2001 and 2002 the effect of four N fertiliser rates (0, 80, 160, 240 kg ha
) on the growth and productivity of three maize hybrids with different vegetation periods was studied in a long-term experiment involving continuous maize, representing a stress environment, set up in Martonvásár on chernozem soil with forest residues almost 50 years ago. Each year eight samples were taken at 14-day intervals for the destructive method of growth analysis. N fertiliser was found to have a significant effect on the growth parameters of individual plants (RGR, NAR, LAR) in both the vegetative and generative stages of growth, up to N rates of 80 and 160 kg ha
, respectively. The value of RGR increased until the N
treatment and that of NAR until N
, while LAR declined significantly in response to N fertilisation. RLGR was enhanced by N fertiliser up to a rate of N
, and all the N treatments reduced the extent of leaf withering. Among the growth parameters of the canopy, the values of CGR and HI rose significantly up to N
and that of LAI
up to N
. The cumulative values of LAD and BMD were highest in the N
treatment. All the growth parameters increased as the vegetation period of the hybrids lengthened, and all reflected the year effect. Compared to the highest N rate, N stress of 29–38% was calculated for the control treatment. On average, N fertilisation resulted in a 6–27% relative decline in LAI after flowering.