scholarly journals DENSIDADE DE PLÂNTULAS E CONCENTRAÇÕES DA SOLUÇÃO NUTRITIVA PARA RÚCULA HIDROPÔNICA NO PERÍODO DE PRIMAVERA E VERÃO / SEEDLING DENSITY AND CONCENTRATIONS OF THE NUTRITIVE SOLUTION FOR HYDROPONIC ROCKET IN THE SUMMER AND SPRING PERIOD

2021 ◽  
Vol 7 (3) ◽  
pp. 23163-23176
Author(s):  
Wagner Dutra Pinheiro ◽  
Albertina Radtke Wieth ◽  
Alexandro Cardoso Carvalho ◽  
Tatiana da Silva Duarte ◽  
Magnólia Aparecida Silva da Silva
Keyword(s):  
Seedling Density ◽  
Spring Period ◽  
Nutritive Solution

Indicators of metabolism and biochemical status of blood in horses of Yakut breed in winter and spring seasons

2020 ◽  
pp. 52-65
Author(s):  
U. Khompodoeva ◽  
R. Ivanov
Keyword(s):  
Classical Method ◽  
Live Weight ◽  
Weather Conditions ◽  
The Body ◽  
Metabolic Energy ◽  
Temperature Changes ◽  
Experimental Animals ◽  
Spring Period ◽  
Biochemical Status ◽  
Adaptive Mechanisms

The results of researches on the peculiarities of metabolism in the body of horses of Yakut breed in the winter and spring periods under the environments of Central Yakutia have been presented in the article. Physiological experiments on the digestibility of the main nutrients of the feed have been carried out in the winter (February) and spring (April) periods under the environments of the physiological yard in the Yakutsk Scientific and Research Institute of Agriculture named after M. G. Safronov with using the classical method. Five mares and five geldings of Yakut breed have been selected for researches. The average live weight of mares was 378–410 kg, geldings 394–403 kg. The experimental animals had average fatness. It has been found a higher intake of energy and the main nutrients of hay as a mono feed in winter compared to the spring period. At the same time pregnant mares in winter have been consumed 103,8±3,12 MJ of metabolic energy per head/day, which was 27,3 % significantly higher than in the spring period – 75,4±2,18 MJ (P ≥ 0,999). Geldings have been consumed in the experiment 67,70±2,85 MJ, which was by 43,7 % higher than in the spring period – 38,05 ± 4,40 MJ of metabolic energy per head/day (P ≥ 0,999). Experimental animals have been housed in stalls; there was no energy expenditure for movement, so the amount of energy consumed in winter indicates the production of heat in the animal’s body. Pregnant mares per 100 kg of live weight have consumed 31,5±4,11 MJ of metabolic energy or 33,3 % more than in the spring period – 21,0±1,98 MJ; geldings have consumed 27,69±1,12, which was 41,78 % significantly higher than in the spring – 16,12 ± 0,75 MJ (P ≥ 0,999). The high intake of metabolic energy into the body of Yakut horses in winter is explained by the manifestation of adaptive mechanisms that affect the effective metabolism for survival, adapted to frequent changes in weather conditions and sharp temperature changes. The established differences in the biochemical parameters of blood serum of horses of Yakut breed are associated with changes in the consumption and digestibility of basic nutrients and energy, depending on the ambient temperature.

scholarly journals Sustainable Large-Scale Aquaculture of the Northern Hemisphere Sea Lettuce, Ulva fenestrata, in an Off-Shore Seafarm

2021 ◽  
Vol 9 (6) ◽  
pp. 615
Author(s):  
Sophie Steinhagen ◽  
Swantje Enge ◽  
Karin Larsson ◽  
Joakim Olsson ◽  
Göran M. Nylund ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Low Temperature ◽  
Northern Hemisphere ◽  
Biochemical Composition ◽  
Large Scale ◽  
Biomass Yield ◽  
Phenolic Content ◽  
Seedling Density ◽  
Ulva Fenestrata ◽  
High Nutrient

The growing world population demands an increase in sustainable resources for biorefining. The opening of new farm grounds and the cultivation of extractive species, such as marine seaweeds, increases worldwide, aiming to provide renewable biomass for food and non-food applications. The potential for European large-scale open ocean farming of the commercial green seaweed crop Ulva is not yet fully realized. Here we conducted manipulative cultivation experiments in order to investigate the effects of hatchery temperature (10 and 15 °C), nutrient addition (PES and 3xPES) and swarmer density (500 and 10,000 swarmers ml−1) on the biomass yield and biochemical composition (fatty acid, protein, carbohydrate, pigment and phenolic content) of off-shore cultivated Ulva fenestrata in a Swedish seafarm. High seedling densities were optimal for the growth of this northern hemisphere crop strain and significantly increased the mean biomass yield by ~84% compared to low seedling densities. Variations of nutrients or changes in temperature levels during the hatchery phase were not necessary to increase the subsequent growth in an open-water seafarm, however effects of the factors on the thallus habitus (thallus length/width) were observed. We found no significant effect of the environmental factors applied in the hatchery on the total fatty acid or crude protein content in the off-shore cultivated Ulva. However, low seedling density and low temperature increased the total carbohydrate content and furthermore, high temperature in combination with high nutrient levels decreased the pigment content (chlorophyll a, b, carotenoids). Low temperature in combination with high nutrient levels increased the phenolic content. Our study confirms the successful and sustainable potential for large-scale off-shore cultivation of the Scandinavian crop U. fenestrata. We conclude that high seedling density in the hatchery is most important for increasing the total biomass yield of sea-farmed U. fenestrata, and that changing temperature or addition of nutrients overall does not have a large effect on the biochemical composition. To summarize, our study contributes novel insights into the large-scale off-shore cultivation potential of northern hemisphere U. fenestrata and underpins suitable pre-treatments during the hatchery phase of seedlings to facilitate a successful and cost-efficient large-scale rope cultivation.

scholarly journals Short-term study on the yak dung seed bank on the Qinghai-Tibetan Plateau: effects of grazing season, seed characteristics and forage preferences

2021 ◽  
Author(s):  
Shulin Wang ◽  
Fujiang Hou
Keyword(s):  
Tibetan Plateau ◽  
Plant Species ◽  
Seed Bank ◽  
Seedling Density ◽  
Seed Shape ◽  
Grazing Season ◽  
Size And Shape ◽  
Foraging Preferences ◽  
Seed Characteristics ◽  
Yak Dung

Abstract Aims Viable seeds in herbivore dung constitute the dung seed bank, and the contribution of livestock dung to this seed bank in grazing pastures is often overlooked. Grazing season (warm and cold), seed characteristics (size and shape), and forage preference are the main factors that affect the size and composition of the dung seed bank and ultimately affect grassland ecology. However, how these three factors interact is unclear. Methods We collected yak dung as well as seeds of the common plant species from warm- and cold-season alpine meadows in northeastern Qinghai-Tibetan Plateau, and explored how grazing season (warm and cold), seed characteristics (size and shape) and foraging preferences (temporary cages method) affects yak dung seedling density, richness and diversity in an alpine pasture. Results Forty-three plant species (mainly perennials) germinated from yak dung. Dung seedling density, richness, and diversity did not differ significantly between the two grazing seasons. Small to medium-sized spherical seeds (seed size < 10 mg, shape index < 0.5) had the greatest germination potential. Conclusions Yaks vary their forage preference depending on the season (phenological period), and endozoochory occurs throughout both grazing seasons. Seed shape and size directly regulate the dung seedling density, richness, and diversity. Dung seedlings increase the heterogeneity of the aboveground vegetation near the microsites of the dung pieces and therefore promote grassland patching. Our study demonstrates that grazing season, seed characteristics, and yak forage preferences affect the dung seed bank in grazing ecosystems.

Effects of seed dispersal, adult tree and seedling density on the spatial genetic structure of regeneration at fine temporal and spatial scales

2010 ◽  
Vol 7 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Fabrice Sagnard ◽  
Sylvie Oddou-Muratorio ◽  
Christian Pichot ◽  
Giovanni G. Vendramin ◽  
Bruno Fady
Keyword(s):  
Genetic Structure ◽  
Seed Dispersal ◽  
Spatial Genetic Structure ◽  
Spatial Scales ◽  
Seedling Density ◽  
Adult Tree ◽  
Temporal And Spatial

Effects of Lead on the Content, Accumulation, and Translocation of Nutrients in Bean Plant Cultivated in Nutritive Solution

2013 ◽  
Vol 44 (5) ◽  
pp. 939-951 ◽  
Author(s):  
Marcele G. Cannata ◽  
Ruy Carvalho ◽  
Alexandre C. Bertoli ◽  
Ana Rosa R. Bastos ◽  
Janice G. Carvalho ◽  
...  
Keyword(s):  
Bean Plant ◽  
Nutritive Solution

Screening of potential donors for immunoglobulins M and G to new coronavirus infection

2021 ◽  
Vol 23 (3) ◽  
pp. 49-54
Author(s):  
Yuliia E. Romashova ◽  
Vladimir N. Vilyaninov ◽  
Nikolay V. Belgesov ◽  
Sergey P. Kaleko
Keyword(s):  
Human Immunodeficiency Virus ◽  
Active Movement ◽  
Frequency Of Occurrence ◽  
Age Group ◽  
Spring Period ◽  
Immunodeficiency Virus ◽  
Coronavirus Infection ◽  
Human Immunodeficiency Virus 1 ◽  
Epidemiological Situation ◽  
Selection Of

This study presents the results of the examination of potential donors of blood and its components for immunoglobulins M and G to patients with coronavirus disease 2019 (COVID-19) living in St. Petersburg. A total of 6782 people aged 1824 years were evaluated, which accounted for 2.07% of the regions population (326 760 people) of this age group. The study was carried out in the spring and autumn of 2020. A negative result (absence of antibodies) was obtained in 93.5% of the participants. The rates of immunoglobulins M and M + G were 0.58% and 4.18%, respectively, in the spring and autumn. Moreover, the number of participants who had immunoglobulins M and G + M in the autumn period was four times higher than the indicators of the spring period, which indicated greater infection activities in the population during this period. This is most likely due to the active movement of the population in the summer. When comparing the rates of COVID-19 infection and the frequency of occurrence in donors of the same age, markers of human immunodeficiency virus 1 and 2 and hepatitis B and C in 2020 (0.024, 0.012 and 0.13%, respectively) indicate the urgency of the problem of donor selection during blood services, especially during a difficult epidemiological situation because of COVID-19. Along with organizational measures for the selection of donors (e.g., attracting individuals from organized groups in which there are no signs of an unfavorable epidemiological situation to donation), mandatory testing of potential donors for immunoglobulins M and G should be considered.

scholarly journals Electrical conductivity and pH of the substrate solution in gerbera cultivars under fertigation

2013 ◽  
Vol 31 (3) ◽  
pp. 356-360 ◽  
Author(s):  
Fernanda Ludwig ◽  
Dirceu M Fernandes ◽  
Poliana RD Mota ◽  
Roberto L Villas Bôas
Keyword(s):  
Electrical Conductivity ◽  
Experimental Design ◽  
Nutrient Uptake ◽  
Plant Nutrition ◽  
Substrate Solution ◽  
Plant Toxicity ◽  
Paulo State ◽  
Ph Values ◽  
Nutritive Solution ◽  
Golden Yellow

The quality and the profitability on floriculture are intimately linked to the adequate plant nutrition. In the present research we aimed to evaluate the electrical conductivity (EC) and pH of the substrate solution on four different gerbera cultivars subjected to fertigation, with two nutritive solutions. The experiment was carried out in a greenhouse, from May to July 2006, on the Universidade Estadual Paulista, Botucatu, São Paulo state, Brazil. The experiment was carried out under an experimental design of random blocks, in 4×2 factorial arrangement, with four Gerbera cultivars (Cherry, Golden Yellow, Salmon Rose and Orange) and two nutritive solution concentrations: 0.92 and 1.76 dS m-1 EC) during the vegetative stage, and 1.07 and 2.04 dS m-1 during the reproductive stage (S1 and S2, respectively). The nutrients were applied through fertigation, manually performed every day. The EC and pH values of the substrate solution were evaluated weekly, using the 'pourthru' method. Orange and Cherry cultivars had, respectively, the highest and the lowest electrical conductivity of the substrate solution, and Cherry was the most efficient on the nutrient uptake. The solution S2 showed a trend to accumulate salts in the substrate, but without visual symptoms of plant toxicity, leading to the lowest pH values. The 'pourthru' method was efficient when compared to the 1:2 method and can be adopted for substrate solution analysis in gerbera culture.

scholarly journals Seasonal shifts in export of DOC and nutrients from burned and unburned peatland-rich catchments, Northwest Territories, Canada

2018 ◽  
Vol 22 (8) ◽  
pp. 4455-4472 ◽  
Author(s):  
Katheryn Burd ◽  
Suzanne E. Tank ◽  
Nicole Dion ◽  
William L. Quinton ◽  
Christopher Spence ◽  
...  
Keyword(s):  
Climate Change ◽  
Mineral Soil ◽  
Fire Regimes ◽  
Forest Litter ◽  
Early Spring ◽  
Permafrost Region ◽  
Spring Period ◽  
Discontinuous Permafrost ◽  
Run Off ◽  
Spring Freshet

Abstract. Boreal peatlands are major catchment sources of dissolved organic carbon (DOC) and nutrients and thus strongly regulate the landscape carbon balance, aquatic food webs, and downstream water quality. Climate change is likely to influence catchment solute yield directly through climatic controls on run-off generation, but also indirectly through altered disturbance regimes. In this study we monitored water chemistry from early spring until fall at the outlets of a 321 km2 catchment that burned 3 years prior to the study and a 134 km2 undisturbed catchment. Both catchments were located in the discontinuous permafrost zone of boreal western Canada and had  ∼  60 % peatland cover. The two catchments had strong similarities in the timing of DOC and nutrient yields, but a few differences were consistent with anticipated effects of wildfire based on peatland porewater analysis. The 4-week spring period, particularly the rising limb of the spring freshet, was crucial for accurate characterization of the seasonal solute yield from both catchments. The spring period was responsible for  ∼  65 % of the seasonal DOC and nitrogen and for  ∼  85 % of the phosphorous yield. The rising limb of the spring freshet was associated with high phosphorous concentrations and DOC of distinctly high aromaticity and molecular weight. Shifts in stream DOC concentrations and aromaticity outside the early spring period were consistent with shifts in relative streamflow contribution from precipitation-like water in the spring to mineral soil groundwater in the summer, with consistent relative contributions from organic soil porewater. Radiocarbon content (14C) of DOC at the outlets was modern throughout May to September (fraction modern carbon, fM: 0.99–1.05) but likely reflected a mix of aged DOC, e.g. porewater DOC from permafrost (fM: 0.65–0.85) and non-permafrost peatlands (fM: 0.95–1.00), with modern bomb-influenced DOC, e.g. DOC leached from forest litter (fM: 1.05–1.10). The burned catchment had significantly increased total phosphorous (TP) yield and also had greater DOC yield during summer which was characterized by a greater contribution from aged DOC. Overall, however, our results suggest that DOC composition and yield from peatland-rich catchments in the discontinuous permafrost region likely is more sensitive to climate change through impacts on run-off generation rather than through altered fire regimes.

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