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  • 1
    Electronic Resource
    Electronic Resource
    Observations on the fine structure of the endophyte of the root nodules of alnus glutinosa (L.) gaertn. (1965)
    Springer
    Archives of microbiology 51 (1965), S. 365-383 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electron micrographs have been prepared showing different stages in the development of the endophyte in Alnus glutinosa root nodules. Although the complete life cycle of the organism has not yet been worked out it is concluded that it is an Actinomycete. The organism can exist as a septate, branching filament of diameter 0.7–1.0 μ. However, under certain conditions within the nodule, the endophyte can form spherical sub-divided vesicles 4–5 μ in diameter and it is suggested that these vesicles are analogous to sporangia. Yet again under other conditions the organism fragments to form bacteroids. It would appear that the different forms of the organism are associated with different seasons of the year and with different metabolic patterns, of particular interest in this connection is the fixation of nitrogen which is associated with the nodule symbiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408918
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  • 2
    Electronic Resource
    Electronic Resource
    Observations on the fine structure of the root nodule endophyte of Hippophaë rhamnoides L. (1970)
    Springer
    Archives of microbiology 70 (1970), S. 183-196 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electron microscopy of ultra-thin sections of Hippophaë rhamnoides root nodules has been carried out in order to elucidate the nature of the endophyte. The organism is seen as a branching, septate filament approximately 0.6 microns in diameter bearing on its terminal ends spherical sub-divided vesicles 3–4 microns in diameter. In the mature nodule the vesicles are the most prominent endophyte form and appear to be formed by swelling of the hyphal tips. It is concluded that the endophyte is an actinomycete closely related to but not identical with that of Alnus glutinosa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407709
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen Fixation in Elaeagnus Root Nodules (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 717-718 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The genus Elaeagnus comprises 30 species widely distributed in Asia, Europe, and North America. Nobbe and Hiltner4 reported that a nodule-bearing plant of E. angustifolia showed marked ability to grow in sand free of combined nitrogen, and attained a height of 120 cm. in four years as compared with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/181717a0
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen Fixation in Non-Legume Root Nodule Plants (1957)
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 680-681 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mainly as a result of improvements in cultural technique, rates of fixation considerably exceeding those previously reported have been attained in recent experiments, particularly with bog myrtle and sea buckthorn. Some values are shown in Table 1. They refer to plants raised in water culture ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/179680a0
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  • 5
    Electronic Resource
    Electronic Resource
    Maternal cardiovascular consequences of positioning after spinal anaesthesia for Caesarean section: left 15° table tilt vs. left lateral (2002)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 57 (2002), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sixty healthy women undergoing elective Caesarean section were randomly allocated to either a measured 15° left table tilt position (n = 31) or full left lateral position (n = 29) for a 15-min period after spinal blockade. Arm and leg blood pressure, ephedrine requirements, symptoms, fetal heart rate, cord gases and Apgar scores were recorded. Mean ephedrine requirements and incidence of hypotension were similar in the two groups. Arm systolic arterial pressure over time was similar in both groups, but leg systolic arterial pressure over time was significantly lower in the tilt group (p 〈 0.001); the mean leg systolic arterial pressure was lower for all 15 sequential recordings in the tilt group, reaching statistical significance (p 〈 0.05) at 4, 5, 6 and 8 min. Differences in maternal nausea, vomiting and bradycardia and fetal outcome were not statistically significant. Following spinal anaesthesia, even a true 15° left table tilt position is associated with aortic compression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2044.2002.02325.x
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  • 6
    Electronic Resource
    Electronic Resource
    The occurrence of amoeboid plastids in the actinorhizal root nodules of Alnus glutinosa (L.) Gaertn. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The invasion of the actinomycete Frankia into the root cells of Alnus glutinosa with subsequent nodule formation effects a number of ultrastructural changes in the host cell cytoplasm. Among other changes the amyloplasts rapidly lose their starch and acquire an amoeboid or pleomorphic form. Such plastids occur predominantly in the mature vesicle-containing, nitrogen-fixing cells of the nodule. They lack starch, have an electron dense stroma and a complex lamellar system. This last would appear to be associated with a distinct membranous reticulum which can be extensive. The flexible form of these plastids is mirrored in their ability to enclose portions of host cytoplasm together with organelles and even other plastids. Their close association with cristate mitochondria suggests an active metabolic role in the nodule symbiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01934.x
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  • 7
    Electronic Resource
    Electronic Resource
    Mycorrhizal improvement in non-leguminous nitrogen fixing associations with particular reference toHippophaë rhamnoides L. (1984)
    Springer
    Plant and soil 78 (1984), S. 189-199 
    Details
    ISSN: 1573-5036
    Keywords: Alnus Hippophaë ; Mycorrhiza ; Myrica ; Nitrogenase ; Phosphate ; Triple symbiosis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The roots ofHippophaë rhamnoides which regularly bear actinomycete induced nodules when growing on Scottish sand dunes have also been found to support an endomycorrhizal association withGlomus fasciculatus. Ultrastructural and cytochemical studies carried out on the indigenous infections of establishedHippophaë mycorrhizal roots would support the postulate that transport is indeed occurring between the fungal symbiont and the host plant and vice versa in respect of phosphate and carbohydrate. Experiments using various inoculation regimes, demonstrated the significant improvement in the mycorrhizal/nodulated plants compared to the nodulated-only and the mycorrhizal-only plants with respect to plant growth, uptake of phosphate and nitrogenase activity, when grown in a medium poor in combined nitrogen and soluble phosphate. Preliminary work onAlnus andMyrica species growing in Central Scotland indicates that the mycorrhizae associated with these nodulated root systems exhibit a different interaction pattern which may be dependent on habitat type and associated angiosperm species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277850
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  • 8
    Electronic Resource
    Electronic Resource
    The occurrence of calyx nodules inPsychotria spp. (Rubiaceae) (1984)
    Springer
    Protoplasma 121 (1984), S. 199-208 
    Details
    ISSN: 1615-6102
    Keywords: Psychotria ; Leaf nodules ; Calyx nodules ; Symbiosis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The occurrence and structure of calyx nodules in the flowers of two leaf nodulated rubiaceous speciesPsychotria punctata Vatke andPsychotria kirkii Hiern. has been described for the first time at the ultrastructural level. Bacteria, resident in colleter-secreted mucilage in the space between calyx and corolla, invade stomatal pores which develop on the calyx protoderm. The bacteria proliferate in the substomatal cavity and then invade the calyx mesophyll. This invasion is most pronounced inP. punctata where the bacteria even penetrate and enter the cells of the vascular tissue. Although no sheath forms around the calyx nodules, the calyx mesophyll cells surrounded by the bacteria become identical in shape, size and secretory function to the invasive mesophyll cells of leaf nodules. The functional and evolutionary significance of calyx nodulation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282313
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