Search results for "Nutrient"
showing 10 items of 668 documents
Identifying a marine microalgae with high carbohydrate productivities under stress and potential for efficient flocculation
2018
Microalgal biomass represents a potential third generation feedstock that could be utilised as a source of carbohydrates for fermentative production of a range of platform biochemicals. Identifying microalgal strains with high biomass and carbohydrate productivities while also being amenable to downstream processes is key in improving the feasibility of these processes. Utilising marine microalgae capable of growing in seawater will decrease reliance on freshwater resources and improve the sustainability of production. This study screened several marine microalgae believed to accumulate carbohydrates to find new high performing strains. Four strains had high growth rates and accumulated car…
An environmental study by factor analysis of surface seawaters in the Gulf of Valencia (Western Mediterranean)
1999
Abstract A study is made on the quality of coastal waters in the Gulf of Valencia (Spain) in terms of contamination markers including microbiological agents, toxic heavy metals and nutrients that adversely affect the environment. Relationships are also established between these factors and other physical and chemical parameters. A multivariate analysis is conducted where a total of 14 parameters are established for 919 water samples corresponding to 52 sampling points along the coast of the province of Valencia – specifically, total and fecal coliforms, fecal streptococci, Ni(II), Zn(II), Pb(II), Cd(II), Cu(II) and Cr(VI) concentrations, nitrates, phosphates, dissolved oxygen and finally pH…
Response of a shallow Mediterranean lake to nutrient diversion: does it follow similar patterns as in northern shallow lakes?
2005
Summary 1. In view of the paucity of data on the response of warm shallow lakes to reductions in nutrient loading, this paper presents a long-term limnological data set to document changes in the food-web of a shallow Mediterranean lake (Lake Albufera, Valencia, Spain) that has experienced reductions in phosphorus (P) (77%) and nitrogen (N) (24%) loading following sewage diversion. 2. Nine years after sewage diversion, P concentration in the lake was reduced by 30% but remained high (TP = 0.34 mg L−1), although the mean water retention time in the lake was only 0.1 years. Nitrate concentrations did not significantly change, probably because the lake continued to receive untreated effluents …
Distribution of aquatic Oligochaeta in the Finnish Lake District
1980
SUMMARY. The distribution of oligochaetes was examined at sampling stations grouped into three types: (1), in eutrophic and dystrophic areas or in areas polluted by pulp-mill wastewaters; (2), slightly eutrophic stations; (3), ‘clean’ stations unaffected by sewage or other inputs. Limnodrilus hoffmeisteri and Potamothrix hammoniensis were practically the only species in group 1, and the same species accounted for two thirds of the total numbers in group 2, although Peloscolex ferox and some other species also occurred. At the cleanest stations the dominating species were P. ferox, Psammoryctides barbatus, Stylodrilus heringianus and Tubifex tubifex. A factor analysis showed that L. hoffmeis…
First Report of Leaf Spot and Blight Caused by Ralstonia pickettii on Bird of Paradise Tree in Italy
2008
Bird of Paradise tree (Strelitzia alba (L. f.) Skeels) is an ornamental perennial tropical plant grown in southern Italy. In the summer of 2006 and 2007, a widespread, severe leaf disease was observed on seedlings and 1- to 2-year-old plants in two glasshouses located in eastern Sicily. Disease incidence ranged from 10 to 25%. Symptoms on the leaves consisted of dark brown-to-black stripes of varying length and found between the lateral veins. Lesions sometimes coalesced into a large area of necrotic tissue. Symptomatic tissues were ground in a drop of sterile distilled water (SDW) with a scalpel. Suspensions were streaked on King's medium B (KB), nutrient agar, and yeast extract nutrient …
Seasonal Variation in Nutrient Status of Foxglove Leaves
2006
The seasonal variation of mineral elements and the relationships among them were studied in natural populations of foxglove (Digitalis obscura). Young and mature leaves were collected in 10 different populations and on four sample dates (May, July, October, and February). Leaf mineral elements [nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), zinc (Zn), and copper (Cu)] were determined. The highest concentrations of N, P, and K in young leaf were recorded in May, followed by a decrease in the other months, while in contrast Ca and Fe showed the lowest concentration in May. Mature leaves showed differential seasonal behavior. Besides seaso…
Growth analysis and mineral content in pistachio (Pistacia veraL.) infructescence and its components
1996
SummaryGrowth and seasonal variation in mineral content was described for infructescence components of ‘Bianca’ pistachio cultivar grafted onto Pistacia therebintus L. The absorption curve specific to each infructescence and fruit component was calculated on a percent dry weight and an absolute content basis. Nutrient uptake by infructescence components was consistent with their development rate. The embryo was the strongest sink for N, P and Mg uptake. Pericarp and rachis accounted for more than 80% of K and Ca accumulated in the infructescence. The highest accumulation rate occurred during rapid embryo growth.
An Integrated Approach to Mandarin Processing: Food Safety and Nutritional Quality, Consumer Preference, and Nutrient Bioaccessibility
2017
Mandarins are a member of the Citrus genus and are the focus of growing commercial interest, with satsuma mandarins (Citrus unshiu) and the common mandarin (Citrus reticulata Blanco) being the most important mandarin varieties. The possible health benefits and functional properties of those fruits are often associated with the antioxidative function of vitamin C, carotenoids, and phenolic compounds. While most mandarins are consumed fresh, many are processed into juices (mostly cloudy), usually via thermal processing which can lead to the creation of off-flavors and may diminish nutritional quality. The aim of this review is to summarize the most significant and recent information on the sa…
The diet of spotted cuscus (Spilocuscus maculatus) in natural and captivity habitat
2010
Saragih EW, Sadsoeitoeboen MJ, Pattiselanno F. 2010. The diet of spotted cuscus (Spilocuscus maculatus) in natural andcaptivity habitat. Nusantara Bioscience 2: 78-83. The ex-situ conservation of cuscus (Spilocuscus maculatus) under captivatingcondition is an alternative solution to protect cuscus from extinction. Diets became the main factor in order to support the domesticationprocess. Particular studies on habitat and diet of cuscus have been carried out however there is still limited information on the nutritionaspects of cuscus food. This study aimed to determine the diet type, palatability and nutrient in both natural habitat and captivatingcondition. The results indicated that there …
Efecto de la carga orgánica y de nutrientes y su biorremediación en sedimentos de ecosistemas acuáticos con distintas características ecológicas
2014
En la presente tesis se seleccionaron como sistemas modelo de estudio dos ecosistemas acuáticos con características ecológicas muy distintas aunque con una problemática ambiental en común: la acumulación de materia orgánica en sus sedimentos (en distinto grado) como consecuencia de la actividad humana. En ambos casos se abordó el estudio tanto del efecto de la adición externa de nutrientes como de la desorción de estos desde sus sedimentos. Posteriormente se evaluó la eficacia de diferentes técnicas de biorremediación para reducir la carga orgánica y de nutrientes en estos sedimentos. El primero de los sistemas acuáticos seleccionados, la Laguna de Talayuelas, se trata de una laguna endorre…