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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 30 (1990), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In a study of the weed flora of dryland crops in the Córdoba region (southern Spain) in 1983 and 1984, a total of 256 species from 41 families was identified in the 201 fields surveyed. The families with the highest numbers of species were Compositae, Gramineae, Leguminosae and Cruciferae. Therophytes represented 79% of the biological spectrum, with hemicryptophytes and geophytes more especially in the spring-sown crops. At the early and late crop growth stages about 4% and 8%, respectively, of the fields had severe or very severe infestations. The seasonality of the crop had a marked influence on the weed flora, mainly due to the relationship of its phenological cycle with well defined climatic periods and to soil management practices. Cluster analysis clearly differentiated typically autumn-spring and spring-summer floras as well as a set of common species.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 30 (1990), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The study was conducted on the weed flora of the main irrigated crops of the Guadalquivir Valley. The TWINSPAN (Two Way Indicator Species Analysis) method was applied for each crop separately to all the species present as well as to their degree of infestation. The results indicated that soil texture may markedly influence the flora, whereas the effects of pH and carbonate content were less important. The climatic differences found in the three areas studied were of little importance. The type of irrigation markedly influenced the flora, although it was always related to edaphic factors, especially texture and slope.In general, the weed flora found in the crops can be divided into two communities. One is characterized by species such as Ridolfia segetum, Picris echioides, Phalaris brachystachys, Phalaris paradoxa and Chrozophora tinctoria and the second by Capsella bursa-pastoris, Cyperus rotundus, Paspalum paspalodes, Digitaria sanguinalis, Sorghum halepense and Portulaca oleracea. The first community comprises weeds in the higher altitudes, further away from the riverbed, with a soil of clayey texture, a high slope and irrigated with sprinklers. The second community comprises the flora of flat areas, with sandy soils, located in the middle and low river terraces and furrow irrigated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 29 (1989), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A floristic study of the weeds in irrigated crops in the Guadalquivir River Valley (southern Spain) revealed a total of 284 species in the 267 fields surveyed, of which about 100 can be considered highly harmful. The families with the highest numbers of species were Compositae, Gramineae, Leguminosae, Cruciferae and Umbelliferae. Although 77·8% of the species were therophytes, geophytes were important in spring-sown crops. Most species were of Mediterranean origin, especially in autumn-sown crops; Cosmopolitan and Neotropical species were more important in the spring-sown crops. At the early and late crop growth stages 7% and 10%, respectively, of the fields had severe or very severe infestations.The relationships between the main weed species and crops were studied by cluster analysis, using the corrected frequency of each species in each crop as the reference parameter. This allowed classification of the species into subgroups and hierarchical groups according to their agro-ecological preferences. A close relationship was found between a given crop, its cycle and the usual soil management practices and the phenology of certain species, reflecting the influence of these factors in restricting the germination period. The analysis differentiated the typically winter, summer and intermediate weed floras.
    Type of Medium: Electronic Resource
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  • 4
  • 5
    Publication Date: 2018-07-04
    Description: Author(s): R. C. Hidalgo, B. Szabó, K. Gillemot, T. Börzsönyi, and T. Weinhart Our discrete element simulations and laboratory experiments revealed that density and friction are well-defined functions of the effective inertial number, which fully captures the effect of grain elongation. [Phys. Rev. Fluids 3, 074301] Published Tue Jul 03, 2018
    Keywords: Multiphase, Granular, and Particle-Laden Flows
    Electronic ISSN: 2469-990X
    Topics: Physics
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  • 6
    Publication Date: 2019-10-23
    Description: Peroxiredoxin 6 (Prdx6) is the only member of 1-Cys subfamily of peroxiredoxins in human cells. It is the only Prdx acting on phospholipid hydroperoxides possessing two additional sites with phospholipase A2 (PLA2) and lysophosphatidylcholine-acyl transferase (LPCAT) activities. There are contrasting reports on the roles and mechanisms of multifunctional Prdx6 in several pathologies and on its sensitivity to, and influence on, the redox environment. We have down-regulated Prdx6 with specific siRNA in hepatoblastoma HepG2 cells to study its role in cell proliferation, redox homeostasis, and metabolic programming. Cell proliferation and cell number decreased while cell volume increased; import of glucose and nucleotide biosynthesis also diminished while polyamines, phospholipids, and most glycolipids increased. A proteomic quantitative analysis suggested changes in membrane arrangement and vesicle trafficking as well as redox changes in enzymes of carbon and glutathione metabolism, pentose-phosphate pathway, citrate cycle, fatty acid metabolism, biosynthesis of aminoacids, and Glycolysis/Gluconeogenesis. Specific redox changes in Hexokinase-2 (HK2), Prdx6, intracellular chloride ion channel-1 (CLIC1), PEP-carboxykinase-2 (PCK2), and 3-phosphoglycerate dehydrogenase (PHGDH) are compatible with the metabolic remodeling toward a predominant gluconeogenic flow from aminoacids with diversion at 3-phospohglycerate toward serine and other biosynthetic pathways thereon and with cell cycle arrest at G1/S transition.
    Electronic ISSN: 2076-3921
    Topics: Chemistry and Pharmacology
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  • 7
    Publication Date: 2021-05-19
    Description: Se evaluó el efecto del tratamiento alcalino con NaOH sobre el rendimiento en la extracción y en las propiedades físicas del agar de Gracilaria verrucosa recolectada en Santa Verónica (Atlántico, Colombia). El tratamiento alcalino se realizó a temperatura entre 80 y 85 °C, con concentraciones de solución de NaOH 3, 5, 7 y 10 % (p/v). Se determinó el rendimiento de la extracción y al agar obtenido se le midió la fuerza del gel y las temperaturas de fusión y gelificación. Aungque el rendimiento máximo se obtuvo para una concentración de 10 %, se encontraron diferencias significativas en las propiedades del agar, obteniéndose fuerza de gel máxima con solución 3 %. El agar-agar obtenido fue utilizado como base para agar nutritivo y se determinó su productividad meidante el método ecométrico utilizando 23 especies bacterianas, de las cuales Salmonella Enteriditis, Salmonella Typhimurium, Salmonella Cholerasuis y Morganella morganii no tuvieron una recuperación satisfactoria en el medio prueba ni en los controles (agares comerciales). Los resultados del índice de crecimiento relativo (ICR) mostraron que el agar nutritivo a base de G. verrucosa tiene las mismas o mejores propiedades que los controles comerciales.
    Description: Effect of the alkaline treatment on the productivity and physical properties of agar-agar from Gracilaria verrucosa. The effect of the alkaline treatment on the yield of the extraction and physical properties of agar from Gracilaria verrucosa collected in Santa Verónica (Atlántico, Colombia) was investigated. The concentrations of sodium hydroxide solutions during the alkaline treatment were 3, 5, 7 and 10 /w/v), while temperature was mainteined in the range of 80-85 °C. The agar yield, gel strength, melting and gelification temperatures were determined. Although the maximum yield was obtained with 10 % sodium hydroxide solution, the maximum gel strength was obtained at 3 %. The agar-agar was used as a base of nutritive agar for 23 bacterial cultures and the productivity was measured using the ecometric method. From the bacterial strains tested, Salmonella Enteriditis, Salmonella Typhimurium, Salmonella Cholerauis and Morganella morganii did not grow in the test of commercial media. The measures of relative growth index showed that nutritive agar from G. verrucosa have the same or better properties than the comercial ones.
    Description: INVEMAR
    Description: Published
    Keywords: Gracilaria verrucosa ; Productivity ; Red algae ; Agar
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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