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  • 1
    Electronic Resource
    Electronic Resource
    Factors affecting dormancy and germination of seeds of Eichhornia crassipes (Mart.) Solms from the Nile (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 16 (1976), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: E. crassopes requires specific conditions for germination. The best laboratory germination was in clay soil, rich in organic matter, under less than 3 cm depth of water, in light. There are interactions with water depths, soil type, organic deposits, light and temperature.Storage conditions of seeds before germination affect the results. Wetting, drying and re-wetting gave quickest, and complete germination. After 2 years dry-storage, 78% of the seeds were still viable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1976.tb00383.x
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  • 2
    Electronic Resource
    Electronic Resource
    Sexual reproduction of Eichhornia crassipes (Mart.) Solms in the Nile (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 15 (1975), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In a study of some of the factors that are believed to affect fruit-setting in Eichhornia crassipes under Sudan conditions, the average number of flowers per inflorescence was twelve (range 4–26) while the average number of capsules per inflorescence was 1·5 (range 0–16). The problem of low fruit-setting was suggested to be basically due to the ecological factor of high temperature and low relative humidity.The flowers were preponderantly meso-stylic with the long and short-stylic ‘races’ absent or very rare.Recherches stir la biologic d'Eichhornia crassipes (Mart.) Solms dans le NilDans une étude sur quelques-uns des facteurs que l'on suppose actifs sur la mise à fruits de l’Eichhornia crassipes. dans les conditions du Soudan le nombre moyen de fleurs par inflorescence fut de 12 (s'étendent de 4 à 26), cependant que le nombre moyen de capsules par inflorescence fut de 1,5 (s'étendant de 0 à 16). Le probléme de la faible mise à fruit suggere qu'elle pourrait etre due a des facteurs écologiques: température élevée et faible humidity relative.Les fleurs étaient en majorité meso-stylées, les races à long style ou à style court étaient absentes ou tres rares. Generative Vermehrung von Eichhornia crassipes (Mart.) Solms. im NilIn einer Untersuchung über einige Faktoren, von denen angenommen wird, dass sie die Fruchtbildung von Eichhornia crassipes unter sudanesischen Bedingungen beeinflussen, war die durchschnittliche Anzahl von Blüten, 12 Blüten pro Inflorescenz (4–26), wáhrend die durchschnittliche Anzahl von Kapseln nur 1.5 Kapseln pro Inflorescenz war (0–16), Das Problem der geringen Fruchtausbildung wurde folgenden okologischen Faktoren zugeschrieben; hohe Temperatur und niedrige Luftfeuchtigkeit.Bei den Blüten wurden überwiegend Stempel miltlerer Länge gefunden, während die ‘Rassen’ kurzer und langer Stempel nicht oder nur sehr selten anzutreficn waren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1975.tb01089.x
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  • 3
    Electronic Resource
    Electronic Resource
    A study of assimilation and translocation in Cuscuta hyalina Heyne ex Roth., Orobanche ramosa L. and Striga hermonthica Benth. (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 16 (1976), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Quantitative determinations of chlorophyll showed that Cuscuta hyalina and Striga hermonthica possess chlorophyll. No trace of chlorophyll was found in Orobanche ramosa. Autoradiographic evidence showed that both radiocarbon and radiophosphorous moved from host to parasite in alt three species. Photosynthesis occurs in S. hermonthica when the parasite is isolated from its host. The adventitious roots of S. hermonthica and O. ramosa appear to be functional in absorbing a proportion of the required inorganic substances and water. S. hermonthica is a hemiparasite, O. ramosa is a holoparasite but C. hyalina is best described as a partial parasite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1976.tb00385.x
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  • 4
    Electronic Resource
    Electronic Resource
    Ecological studies in the vegetation of the Sudan (1971)
    Springer
    Plant ecology 23 (1971), S. 153-176 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The general features of the vegetation of Khartoum Province, Sudan, are described with a brief account of the geology, geomorphology, soils and climate of the area. The study gives the detailed description of the thirteen community types which are recognized as the principal units of the vegetation of the Province. For each community type the analytic, synthetic and habitat characters are given. Sociological ranges of the species, features which characterize each community type, the floristic similarities and differences between the community types are discussed. Vegetational forms are also recognized and classified. The vegetation of this arid region reflects an interesting picture of a floristically poor vegetation divisible into a surprisingly small number of plant communities recognized in the field in terms of the vegetation and habitat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02350620
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  • 5
    Electronic Resource
    Electronic Resource
    Ecological studies in the vegetation of the Sudan (1971)
    Springer
    Plant ecology 23 (1971), S. 177-198 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The hydro-ecological relationships (interaction of rainfall, topography and soil type) and the effect of the biotic factor (grazing and human interference) on the distribution, establishment and dynamics of the communities characterizing the vegetation of Khartoum Province, Sudan are outlined. In this arid region the type, density and performance of the plants depend on the water resources of the habitat and an intimate relationship exists between landform and plant growth. The small local differences in ground level control the direction of water, thus increasing the water and the soil of one area at the expense of another. The “favoured areas” show dense growth, vegetation follows and marks the water-leading and water-collecting channels. Thus the distribution of the community types in this locality seems to be a function of the interaction of soil type, topography and moisture content. Grazing, in addition to reducing the vegetative material, changes the species composition of the plant communities and induces, in some plants, the production of a certain growth form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326661
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  • 6
    Electronic Resource
    Electronic Resource
    Ecological studies in the vegetation of the Sudan (1971)
    Springer
    Plant ecology 23 (1971), S. 177-198 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The hydro-ecological relationships (interaction of rainfall, topography and soil type) and the effect of the biotic factor (grazing and human interference) on the distribution, establishment and dynamics of the communities characterizing the vegetation of Khartoum Province, Sudan are outlined. In this arid region the type, density and performance of the plants depend on the water resources of the habitat and an intimate relationship exists between landform and plant growth. The small local differences in ground level control the direction of water, thus increasing the water and the soil of one area at the expense of another. The “favoured areas” show dense growth, vegetation follows and marks the water-leading and water-collecting channels. Thus the distribution of the community types in this locality seems to be a function of the interaction of soil type, topography and moisture content. Grazing, in addition to reducing the vegetative material, changes the species composition of the plant communities and induces, in some plants, the production of a certain growth form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02350621
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  • 7
    Electronic Resource
    Electronic Resource
    Ecological studies in the vegetation of the Sudan (1971)
    Springer
    Plant ecology 23 (1971), S. 153-176 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The general features of the vegetation of Khartoum Province, Sudan, are described with a brief account of the geology, geomorphology, soils and climate of the area. The study gives the detailed description of the thirteen community types which are recognized as the principal units of the vegetation of the Province. For each community type the analytic, synthetic and habitat characters are given. Sociological ranges of the species, features which characterize each community type, the floristic similarities and differences between the community types are discussed. Vegetational forms are also recognized and classified. The vegetation of this arid region reflects an interesting picture of a floristically poor vegetation divisible into a surprisingly small number of plant communities recognized in the field in terms of the vegetation and habitat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326660
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  • 8
    Electronic Resource
    Electronic Resource
    Multielement NAA for the characterization of Saudi Arabian rocks (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 109 (1987), S. 201-211 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The instrumental neutron activation analysis technique (INAA) was used in the qualitative and quantitative analysis of 48 geological samples from the Umm Al-Birak area in the Kingdom of Saudi Arabia. The samples were properly prepared together with their standards and simultaneously irradiated in a neutron flux of 2.4 ·1012 n·cm−2 s−1 in the reactor facilities of the National Tsing Hua University (THOR) in Taiwan. Gamma-spectra from the high resolution Ge(Li) detector were analyzed using the BRUTAl code. As a result of the analysis of the geological samples, 20 trace elements were identified qualitatively and quantitatively. These elements are: Co, Cr, Eu, Fe, Hf, K, La, Lu, Na, Rb, Sc, Sm, Ta, Tb, Th, U, Yb, Zn and Zr. The concentrations of these elements have been used in the investigations of the geochemistry of the Umm Al-Birak microgranite site using the BMDP computer code of the Ministry of Petroleum and Mineral Resources. This investigation showed that the high grade area is a differentiated rock that crystallized in a late stage of the Umm Al-Birak microgranite area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02117536
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  • 9
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    THE GEOCHEMISTRY AND PETROGENESIS OF THE LATE CRETACEOUS ABU KHURUQ ALKALINE COMPLEX, EASTERN DESERT, EGYPT (2013)
    Mineralogical Association of Canada
    Details
    Publication Date: 2013-12-13
    Description: The Late Cretaceous rocks of the Abu Khuruq ring complex (AKRC), exposed in the southern Eastern Desert, Egypt, comprise phonolite, trachyte, syenogabbro, essexite, nepheline syenite, and quartz syenite, as well as quartz- and nepheline-bearing pegmatites. The rocks of the complex are dominantly metaluminous and enriched in both large-ion lithophile (LIL) and high-field-strength (HFS) elements with a lack of a negative Nb anomaly. All rocks have high LREE content relative to HREE, show weak to steep fractionated REE patterns [5.6 〈 (La/Yb) n 〈 18.6], and possess the geochemical characteristics of anorogenic suites. Syenogabbros display REE patterns [11.8 〈 (La/Yb) n 〈 14.2] not significantly different from those of the essexite unit and the essexitic xenoliths found in the nepheline syenite [(La/Yb) n in the ranges 12.0–13.7 and 15.6–18.6, respectively]. They have relatively weakly fractionated HREE patterns [3.0 〈 (Gd/Yb) n 〈 3.7], low Yb n and Lu n values (〈 10), and no Eu anomaly. The syenogabbros (〈3 wt.% MgO, 〈20 ppm Ni, and negligible Cr) presumably formed by fractional crystallization of an alkaline basaltic magma. The syenogabbroic melt yielded the essexite by removal of plagioclase and clinopyroxene. The silica-undersaturated evolved rocks have conformable trace-element and REE patterns [10.8 〈 (La/Yb) n 〈 14.2], without significant variations in LILE and HFSE, and negative Ba, Sr, Ti, and Eu anomaly. The normalized trace-element and REE patterns of these two units are quite similar. We infer a comagmatic relationship for the phonolites and nepheline syenites, both formed by simple fractional crystallization of an essexitic melt. The trachytes have lower MgO and CaO contents than the phonolites. The quartz syenite unit exhibits moderately fractionated REE patterns [9.3 〈 (La/Yb) n 〈 14.4], with (Eu/Eu*) n in the range 0.5–1.1]. This marginal unit may well have been derived from the SiO 2 -undersaturated syenitic magma, but it was contaminated by crustal material.
    Print ISSN: 0008-4476
    Topics: Geosciences
    Published by Mineralogical Association of Canada
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  • 10
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    Calreticulin exposure is required for the immunogenicity of γ-irradiation and UVC light-induced apoptosis (2007)
    Springer Nature
    Details
    Publication Date: 2007-07-27
    Print ISSN: 1350-9047
    Electronic ISSN: 1476-5403
    Topics: Biology , Medicine
    Published by Springer Nature
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