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Compositional characteristics of low-alcohol wines obtained by staggered grape harvesting technology
No full textExcessive alcohol consumption has many negative effects on human health and society itself. Climate change and the
improvement of viticultural technologies have gradually led to an increase in the alcoholic concentration of wines, a
trend that has become contrary to the current requirements of consumers inclined to a healthy diet. The aim of the study
was to obtain wines with low alcohol concentration through a simple and accessible technology, by staggered grape
harvesting, at 100 and 150 g/L sugars (“in green”) and at full grape maturity (Muscat Ottonel and Pinot gris varieties),
in the ecopedoclimatic conditions of Copou-Iasi wine center, NE of Romania. By blending the experimental wines were
obtained improved beverages in terms of physico-chemical characteristics, phenolic composition and chromatic
parameters, with alcohol concentrations between 6.5 and 8.5% vol. Sensory properties changed significantly, being
produced more acid wines, with less full bodied perception and reduced persistence as detracting characteristics
The action of growth regulators on the process of photosynthesis in tomato plants
No full textThis research was conducted to determine the effects of two biostimulants on photosynthesis processes of two tomato
cultivars, in greenhouse conditions. This study was carried in 2021 at the ICAM Iasi under greenhouse condition. The
biological material was represented by two tomato cultivars (Drорs and Chiquitа). The bifactorial experience was
conducted in a pots experiment in randomized blocks with three repetitions. The application of biostimulants
(Bactamil and Agromax-Cap) was done every seven days by foliar spraying throughout the vegetation period. Research
was focused on the influence of biostimulants on the photosynthesis process. It has been shown that the chlorophyll
content of the leaves is closely related to the mineral nutrition of the plant. The value of chlorophyll content increases
with the amount of nitrogen in the leaves, which is why the high values indicated by SРАD show a healthy growth from
a nutritional point of view. Plants treated with biostimulants had higher values of the total chlorophyll content compared
to the control group, which demonstrates an intensification of the photosynthesis process. The yield of the Agomax –
Cap stimulator gives better results in terms of the increase in chlorophyll content in the varieties studied and as a result,
will also increase the production efficiency.
Implicit chaos in complex systems in the form of period doubling through harmonic mappings
Get PDFIn the Multifractal Theory of Motion, in the form of Schrödinger – type “regimes”, non – linear behaviors of a complex system are analysed. Then, in the non - stationary case, symmetries of SL(2R)-type for structural units of any complex system can be highlighted. These become functional, for example in the form of period doubling "synchronization mode". This “mode” can mime a possible scenario toward chaos (period doubling scenario), without concluding in chaos (non – manifest chaos)
Efectul perioadei de tăiere a pomilor de cireş (Prunus avium L.) din cv „Skeena” asupra producției şi calităţii fructelor
Get PDFThe study was carried out between 2018 and 2020, in the central area of the Republic of Moldova. The purpose of the research was to assess the effect of the pruning of Skeena variety cherry trees (Prunus avium L.), grafted on the Maxima 14 rootstocks, during the rest and vegetative phase. The pruning was done as follows: during the rest period (control group), during the flowering period; after the harvesting (in July) and in early autumn (the first decade of September). The quantity of fruit 24 mm and downwards in diameter was small in all variant. The pruning performed in early autumn reduced the amount of small fruit and increased the number of the fruit the diameter of which was 28 mm and upwards. At the same time, the expansion of the fruit size led to a slight increase in the fruit yield. The content of the soluble dry matter and titratable acidity in the fruit was almost not affected. It is necessary to conduct researches into the pruning during the vegetative phase for the purpose of the improvement of the fruit quality and the distribution of the fruit by commercial sizes, without affecting the crop yield. A long-term study, on the other hand, would be needed to assess the impact of the pruning time on harvests and, especially, on the commercial type of fruit
Research on the impact assessment of the environment produced by the small hydroelectric power plants arranged on rivers from Suceava county
No full textMonitorizarea evoluţiei agenţilor patogeni la soiurile cultivate în Centrul viticol Copou, în contextul schimbărilor climatice
Get PDFIn the present, the vine culture is dependent on phytosanitary treatment applied against the pathogenic agents whose evolution can cause significant crop damage. Performing rational treatments in closely linked with the vine growth phenophases and climatic conditions influences the development and degree of attack of pathogens. The present paper aims to present the results of monitoring the evolution of pathogens in nine genotypes grown in the Copou wine center during two different years in terms of climate, 2020 and 2021, under the influence of the application of treatment schemes meant to maintain a low level of intensity, frequency and degree of attack of each pathogen. The studied genotypes have been assessed with the OIV scores of resistance level between 5-9 for the downy mildew, powdery mildew and gray mold attack
Study of moisture distribution in drip-irrigated cambic chernozem in the Cracau Plain
Get PDFDrip irrigation allows plants to be watered by slowly wetting the soil on a small surrounding area using special devices
that distribute water drop by drop. The main advantage of drip irrigation compared to classic irrigation methods is that
the necessary water amount is considerably reduced by wetting the soil strictly in the area that contains the roots for the
plant. This allows a rigorous dose of the distributed water amount. On a clay loam cambic chernozem in the Cracau
Plain that has a present moisture content of 19% g/g, field capacity of 23.2 % g/g, wilting coefficient of 14.8% g/g and
bulk density of 1.36 g/cm3
(mean values for a depth range of 0 - 80 cm), we performed water irrigation for a duration of
10 hours using spiral microtube dripping devices. The total water discharge per dripping unit ranged from 19.6 – 36.1 l,
and the water flux ranged from 1.96 – 3.65 l/hour. Twenty-four hours after irrigation, we observed that the distribution
of about 20 l of water, with a water flux of about 2 l/hours, provided soil wetting of the zone under the dripping device
at higher values than the field capacity at a depth of 80 – 90 cm. The diameter of the wetting contour ranged from 60 –
100 cm at a depth from 40 – 50 cm, and the border diameter of the wetting zone ranged from 100 – 400 cm at a depth
from 50 – 70 cm. Higher water flux values or longer irrigation durations resulted in a longer overwetting state in the
upper half of the active layer of the soil and in water loss by percolation
Studies regarding the influence of some yeast strains on the volatile compounds and biogenic amines contents of white wines
No full textCoffee caffeine expertise and its effects on nutrition and consumers health
No full textThe experimental research looked at the side effects of coffee alkaloids on consumer nutrition. Most coffee drinkers do
not know the side effects of alkaloids in that, especially caffeine. On the other hand, from a nutritional point of view,
the higher the caffeine content, the higher the mineral content. So, the permissible dose limit of caffeine, an exciting
nerve cell alkaloid, LD50 of 200 mg caffeine / 100 g of coffee, induces a better state of comfort, concentration and
better energy level, because when the amount of coffee used to prepare a coffee, increases the level of minerals,
although the benefits of coffee consumption disappear. The experimental results obtained show that at caffeine
concentrations of 200 mg / 100 g coffee the permissible limit level, the concentration in mineral substances is 692.1 mg
for Arabica coffee and 391.5 mg for Robusta coffee. The LD50 limit of 200 mg / 100 g of caffeine means 3 and a half
doses for Arabica coffee and 2 doses for Robusta coffee. In conclusion, what exceeds this number of doses, i.e. between
225-300 mg / 100 g caffeine, 4-5 doses, a concentrated coffee, means a consumption of coffee with harmful effects on
the body, even if the human metabolism requires it due to a significant intake of mineral salts of 7.94% for Robusta
coffee and 13.88% for Arabica coffee compared to the recommended daily dose DZR