Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 22

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  calcium chloride
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Dust on gravel roads is reduced through the application of various dust minimization materials, most frequently calcium chloride. However, global efforts have been intensified to find new effective materials that cause the least damage to the environmental. One of them is Safecote, a new patented product. In 2008 measurements were performed on the gravel road Jusevičiai-Būdvietis-Derviniai, which was treated with calcium chloride. Experiments of particulate matter concentrations in the air, when gravel road pavement was treated with a mixture of calcium chloride and Safecote, were carried out in the summer of the same year. As the findings of the experimental investigation of particulate matter concentrations in the air show, the concentration of particulate matter on the gravel road treated with calcium chloride alone reached, on average, 1.90 mg/m³, while on that treated with the mixture was 0.40 mg/m³.
The aim of this trial was to investigate the pre-harvest foliar application of calcium chloride and potassium thiosulfate each at 0.0, 0.2 and 0.4 % on some quality of tomato fruit (hybrid 65010) during cold storage. The experimental layout of cold storage experiments was a split-split-plot based on Randomized Complete Blocks design with three replications. Time of cold storage, calcium chloride and potassium thiosulfate levels were randomly distributed in the main, sub- and sub-sub plots, orderly. At the termination of cold storage, effect on tomato fruit titratable acidity, vitamin C and lycopene contents while, negative impact on firmness and total soluble sugars contents was obtained. At termination of cold storage, pre-harvest foliar calcium chloride at 0.2 and/or 0.4 % caused increments in fruit titratable acidity, vitamin C, total soluble sugars, lycopene and firmness contents. In addition, pre-harvest foliar potassium thiosulfate at 0.4 % enhanced fruit vitamin C, total soluble sugars, lycopene and firmness contents and also increased titratable acidity content. Generally, the interaction between cold storage × pre-harvest foliar calcium chloride or potassium thiosulfate at 0.2 and/or 0.4 % increased fruit total titratable acidity, vitamin C, total soluble sugars, lycopene and firmness contents. Also, the interaction between pre-harvest calcium chloride × potassium thiosulfate at 0.4 % was distinguished and increased all studied fruit quality at the end of cold storage. The interaction treatment of cold storage × calcium chloride at 0.4 % × potassium thiosulfate at 0.4 % was the best that improved fruit quality more than others.
A pot culture was carried out with Oryza sativa L. vari-Co-39, to investigate the effects of supplementary calcium chloride on plants grown at NaCl (50mM) concentration. Treatments were: (1) Control: nutrient solution alone (C); (2) nutrient solution plus 50mM sodium chloride (NaCl); (3) nutrient solution plus 10mM calcium chloride (CaCl2); (4) nutrient solution plus 15mM calcium chloride (CaCl2); (5) nutrient solution and 50 mM NaCl plus supplementary 10 mM CaCl2 (NaCl + CaCl2); and (6) 50 mM NaCl plus additional mixture of 15 mM CaCl2 in nutrient solution (NaCl + CaCl2). The plants grown under salt stress produced low dry weight and relative water content than those grown in standard nutrient solution and in CaCl2 alone. Supplemental calcium chloride added to nutrient solution containing salt significantly improved growth and relative water content. Membrane permeability increased with high NaCl application and these increases in root membrane permeability were decreased with supplementary Ca. The concentration of chloride (Cl) increases highly for all treatments. Sodium (Na) concentration in plant tissues increased in both shoots and roots at high NaCl treatment. Application of supplementary Ca lowered Na concentration. Concentrations of Ca. K and N were at deficient ranges in the plants grown at high NaCl levels and these deficiencies were corrected by supplementary Ca. The ameliorating effect of Ca on growth and physiological variables could reduce the negative effect of salinity of Oryza sativa L., plants.
The suppressive effect of sodium and calcium salts applied individually or combined with the yeast Saccharomyces cerevisiae against Alternaria solani the causal agent of early blight disease of potato was evaluated under laboratory, greenhouse and field conditions. In vitro test a complete inhibition in fungal growth was observed at concentration of 30 mg/ml of both sodium bicarbonate and calcium chloride. The commercial backing yeast S. cerevisiae (CBY) enhanced the inhibitory effect of tested salts reflected in increasing mycelial fungal growth reduction when combined at the rate of 1:1 at each concentration tested. In pot experiment, under artificial infestation with pathogenic fungus, application of sodium bicarbonate or calcium chloride significantly reduced the early blight incidence and severity by increasing their concentrations. Their most effective concentration were 30 mg/ml that reduced the disease incidence by 50 and 62.4%, respectively. Superior effect of sodium bicarbonate or calcium chloride in disease reduction was observed when they combined with CBY. Field trails for evaluating the most promising greenhouse treatments were preformed under natural infestations during two successive summer seasons. Calcium chloride proved higher efficacy for reducing both disease incidence and severity than that of sodium bicarbonate when applied either alone or combined with CBY. Also, it is observed that increasing concentrations of both sodium bicarbonate or calcium chloride showed parallel decrease in disease incidence and severity. Application of (CBY) enhanced the efficacy of salts spraying against early blight disease. Similar trend was also observed with the increase of potato tubers yield. On the light of the present study it could be suggested that the usage of combined application of the yeast S. cerevisiae with sodium bicarbonate or calcium chloride might be used as easily applied, safely and cost effective control methods against such plant diseases.
Blackberries (Rubus spp.) have significant nutraceutical properties, providing phenolic compounds for the consumers. These compounds are useful to human health due to their high antioxidant activity. However, most blackberries destined for fresh markets become unmarketable in 2 to 3 days due to decay and leakage, because they have thin and fragile skin. The present study was aimed to investigate the effect of salicylic acid (SA) and calcium chloride (CaCl2) on extending the postharvest quality and bioactive compounds of blackberry during refrigerated storage. Blackberry fruits cv. ‘Jumbo’ were dipped in 2% CaCl2, or in 2.0 mM salicylic acid (SA) for 10 min. Total soluble solids contents, titratable acidity, pH, ascorbic acid contents, total phenolics contents, and total antioxidant activity were investigated initially on 4th, 7th, or 10th day (d) of storage. Changes in fresh weight, titratable acidity, ascorbic acid and total phenol contents were markedly delayed by both treatments. Berries treated with 2 mM SA or 2% CaCl2 exhibited markedly better visual quality during the storage period. Considering the overall findings, this study revealed that postharvest SA or CaCl2 applications maintained the storage-life and conserved the valuable marketing features of blackberries over 10 d in cold storage, presumably due to their inhibitory effects on fruit senescence.
The aim of the study was to examine the effect of calcium chloride (CaCl,) spraying at different rates of water on apple (Malus domestica Borkh.) calcium concentration. The examination was carried out in 1997-1998 on 'Jonagold' apple trees grafted on M.26 rootstock and planted in 1990 on sandy-loam soil at a distance of 4 x 2.5 m.The trees were trained as a spindle at 2.4 m and 2 m of height and canopy width, respectively. In the experiment apple trees were sprayed with CaCl, at a rate of 7 kg ha 1 using 250, 500, 1000 and 1500 L of water volumes which gives: 2.8, 1.4, 0.7 and 0.5% CaCl, solutions, respectively. Sprays with CaCl, solutions were applied 6, 4 and 2 weeks before commercial fruit harvest. The trees unsprayed with Ca served as a control. The study showed that sprays with CaCl, at all studied water volumes had not effect on leaf and fruit damages. Regardless of the applied water rates, apples from the middle and the bottom of the canopy had higher calcium concentrations as a result of CaCl, sprays whereas this treatment had not effect on fruit calcium concentration from the top of the canopy. However, the laboratory study showed that 'Jonagolď apples from the canopy top had ability to take up exogenous calcium. It was found that efficacy of CaCl, sprays at studied water rates in increasing fruit calcium concentration was similar. The study showed as well that young 'Jonagold' fruitlets took up clearly less exogenous calcium compared to mature fruit which suggests that sprays of this cultivar with calcium salts should be applied mainly at late apple development stages.
The effect of sodium chloride and calcium chloride on the fracture properties of whey protein concentrates (WPCs) and whey protein isolate (WPI) gels was investigated. Compression of gel samples was used to measure true shear stress at fracture and true shear strain at fracture. Investigated WPCs had such a great content of sodium and calcium ions, that they had a detrimental effect on shear stress values. Gels made from WPI and WPCs had similar salt- associated changes in shear stress at fracture, but shear strain responded in opposite way. Considering the content of calcium and sodium in concentrates, added NaCl and СаСІ2 influenced the fracture properties in the same way as WPI gels.
The aim of this study was to examine effect of frequency of calcium chloride (CaCl2,) sprays on 'Jonagolď apple (Malus domestica Borkh.) quality. The experiment was carried out in 1996-1998 in the Experimental Orchard of the Research Institute of Pomology and Floriculture in Skierniewice. Apple trees were grafted on M.26 rootstock and planted in 1992 at a distance of 4 x 2 m on a sandy loam soil with high available phosphorus, potassium and magnesium contents. Four experimental treatments were applied: (i) three sprays with CaCl2, solutions at 2, 10 and 18 weeks after full bloom, (ii) six sprays with CaCl2, at 2, 6, 10, 14, 16 and 18 weeks after full bloom, (iii) nine sprays with CaCl2, at 2, 4, 6, 8, 10, 12, 14, 16 and 18 weeks after full bloom and (iv) control plot - trees unsprayed with CaCl,. The results showed that fruit Ca concentration increased with the number of CaCl, sprays during the growing season. Apples nine-times sprayed with CaCl, solutions were smaller, less mature at harvest and after storage, had lower titratable acidity and soluble solids contents after storage and were less sensitive to bitter pit, internal breakdown and Gloeosporium-rot compared to other treatments; however these effects were influenced by the growing season. Six CaCl2, sprays only in one year of the study increased fruit firmness after storage, fruit resistance to bitter pit and internal breakdown. Three CaCl2, sprays decreased bitter pit incidence; however this effect was found only in one investigated year.
The aim of the study was to follow up the properties of cheese mass obtained from ewes’ milk depending on the pasteurisation temperature, the kind of starter added and level of calcium chloride addition. The chemical composition, pH and texture of cheese mass produced from raw, pasteurised in 72°C for 15 s, and pasteurised in 95°C for 5 s milks were established. Similarly the cheese mass obtained from pasteurised milk without starter addition, with starter of mesophilic bacteria (Lc. lactis ssp. lactis, Lc. lactis ssp. cremoris, Lc. lacits ssp. diacetilactis) and with thermophilic starter (Str. thermophilus, Lb. delbrueckii ssp. bulgaricus). The same routine was applied to cheese mass obtained from pasteurised milk without CaCl2 addition or with 0.1 g/l, or 0.2 g/l of dehydrated CaCl2 addition.
To compare the effect of NaCl, CaCl2 and their combinations on germination and early seedling growth stages of Lycopersicum esculentum L., were studied under pot experiments 2008. Results indicated that significant increases were recorded in percentage of germination, seedling fresh and dry weights, seedling length, water content, catalase activity and photosynthetic pigments (chlorophyll a, b and total chlorophylls as well as carotenoids) under the low level concentration (20 mM) of NaCl or CaCl and their combination (1:1). On other hand increasing salt concentration in nutrient solution caused significant decrease in all of these parameters. The great reduction occurred under high salinity level of NaCl (50 mM). Meanwhile, peroxidase activity increased significantly with increasing salinity levels from 20 mM to 50 mM of both applied salinity types. Besides, peroxidase activity under NaCl salinity showed a marked increase followed by NaCl + CaCl2 (1:1) and CaCl2 at 50 mM.
The aim of the presented study was to determine the effect of foliar application of CaCl2 on the level of β-carotene, lutein, tocopherols and phenolic compounds in the leaves of lettuce cv. Omega (Lactuca sativa L.). The experiments were conducted in the greenhouse of the Faculty of Cultivation and Fertilisation of Horticultural Plants, University of Life Sciences in Lublin. During the growing period, 7 and 14 days before harvest, the plants were treated with a solution of CaCl2 with concentrations of 0.1 M and 0.2 M. Plants sprayed with water were the control treatment in the experiment. Analyses were performed on whole leaves and the blade without midrib. The obtained results indicate that the leaves of lettuce cv. Omega are a good source of phenolic compounds, carotenoids and tocopherols. The dominant carotenoid in lettuce cv. Omega was β-carotene. Foliar application of CaCl2 on the plants did not have any significant effect on the level of β-carotene and lutein in the whole leaves. The contents of tocopherols, total phenolic compounds and chlorogenic acid were dependent on the concentration of CaCl2. The application of 0.1 M CaCl2 solution in the plants resulted in a decrease in the level of total phenolic compounds and chlorogenic acid, and an increase in tocopherol content. However, the treatment of the plants with 0.2M CaCl2 solution caused a lowering of the concentration of tocopherols and an increase in the content of chlorogenic acid and total phenolic compounds.
In a pot culture experiment, the effect of calcium chloride (CaCl2) as an ameliorating agent on sodium chloride (NaCl) stress was studied in Dioscorea rotundata plants. Plants were raised in pots and exposed to salinity stress (80 mM NaCl) with or without 5 mM CaCl2. NaCl-stressed plants showed decreased protein and total sugars, and increased free amino acid and proline content. When NaCl treatment was combined with CaCl2, overall plant metabolism was altered, with increased antioxidant enzyme activity, paving the way for partial amelioration of oxidative stress caused by salinity.
The aim of this experiment was to evaluate the effect of "anionic salts", such as ammonium chloride (NH₄Cl), aluminium sulphate (Al₂(SO₄)₃·16 H₂O), ammonium sulphate (NH₄)₂SO₄, and calcium chloride (CaCl₂·2H₂O), on the calcium metabolism, copper, zinc, and molybdenum concentrations and superoxide dismutase (SOD) activity in bovine blood. The experiment was carried out on 26 cows over a 2 year period. Cattle were fed daily fodder containing the chemical compounds. During the first year, two districts (A - experimental, B - control) were evaluated for deficiency diseases. During the second year, blood concentrations of calcium, phosphorus, magnesium, copper, zinc, molybdenum, and alkaline phosphatase (ALP) and SOD activity were evaluated. Urine pH was also determined. Before and after supplementation, the dietary cation anion difference (DCAD) was evaluated and a mineral fodder ration was formulated for the cows. There were significant differences in the concentration of chlorine and sulfur in the fodder of cows between group A and B after supplementation. Mineral supplementation with chlorides and sulphates is particularly advantageous for systemic acidification. It consisted of the occurrence of lower pH and higher blood concentration of calcium and copper and higher activity of SOD in the urine of experimental cows. This can be seen as improvement of calcium metabolism indicators. DCAD balance was reduced from +241.5 mmol/kg DM to -79.5 mmol/kg DM diet. An increase in ALP activity to normal levels was seen when the animals were given chlorides and sulphates. The study showed that "anionic salts" had a positive effect on mineral metabolism and antioxidant status of dairy cows.
Zbadano katalizujący wpływ chlorku wapnia na proces dojrzewania solonego śledzia bałtyckiego. Tusze śledzia, świeże lub mrożone/rozmrożone, zalewano 12- -procentowym roztworem NaCl zawierającym 0, 0,1, 0,5 lub 1,0%, chlorku wapnia, stosując proporcję surowca do roztworu 1:1 (wagowo). Próby inkubowano przez 18 dni w temperaturze 7±1°C i pobierano do badań po 1, 3, 5, 7, 9, 11, 15 i 18 dobach dojrzewania. Oznaczano pH, zawartość wody i produkty hydrolizy białka (PHB), rozpuszczalne w 6-procentowym roztworze NaCl i w 5-procentowym kwasie trichorooctowym (TCA), metodą biuretową i zmodyfikowaną metodą Lowry’ego, a także pożądalność sensoryczną mięsa. Stwierdzono, że dodatek chlorku wapnia do zalewy najbardziej intensyfikuje powstawanie PHB rozpuszczalnych w 6-procentowym roztworze NaCl, strącalnych w 5-procentowym TCA, w mniejszym zaś stopniu peptydów rozpuszczalnych w 5-pro- centowym roztworze TCA, natomiast prawie nie intensyfikuje powstawania tyrozyny. Działa także konserwująco na solonego śledzia, przedłużając szczególnie okres indukcyjny, przed fazą intensywnego wzrostu trimetylaminy. Chlorek wapnia poprawiał teksturę mięsa solonego śledzia bardziej efektywnie w wypadku surowca świeżego niż mrożone- go/rozmrożonego. Efektywność ta zależała jednak wyraźnie od stężenia chlorku wapnia i czasu dojrzewania. Najlepszą teksturę wykazywały ryby dojrzewające w zalewie zawierającej 0,1% chlorku wapnia. Praktyczne stosowanie chlorku wapnia jako katalizatora procesu dojrzewania ryb solonych może być ograniczone ze względu na jego wyczuwalność sensoryczną w gotowym produkcie. Dlatego maksymalne stężenie chlorku wapnia w zalewie nie powinno przekraczać 0,5%.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.