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  • 1
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Conclusions The relative simplicity of this procedure allows easy routine application to a wide range of environmental samples. Up to 32 samples daily can be analyzed by a skilled technician, almost twice the number possible with most other published procedures. In addition, smaller amounts of reagents and organic solvent are required, and high levels of sensitivity and reliability are achieved.
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  • 2
    ISSN: 1432-2242
    Keywords: Lettuce ; Crisphead Cultivars Off-types Instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The lettuce cv. Valentine regularly produces non-heading off-type plants at the relatively high frequency of 4 × 10−3. They result from mutation to the dominant condition. A similar propensity has been reported twice before in lettuce; it is highly heritable. The propensity to produce off-types was not present in the parents of Valentine so it must have arisen during the pedigree breeding programme. Closely related cultivars do not carry the character but it was subsequently transmitted to Dandie a new cultivar of which Valentine was one of the parents. Allelism tests to relate Valentine off-types to those in crisphead cultivars were not successful. The elimination of off-types in breeding programmes is discussed. Contrary to the findings in day-neutral crisphead cultivars, mutant phenotypes in long-day butterhead cultivars have no selective advantage for seed production. Consequently, strict roguing ensures adequate varietal stability.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 24 (1975), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
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  • 4
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ultrastructural studies of cereal anthers found intranuclear bundles of microfilaments in pollen mother cells (PMCs) but not elsewhere. The ultrastructure, distribution, and behaviour of this fibrillar material (FM) are described. FM was seen in all 19 genotypes studied comprising Aegilops, Triticum, Secale, Hordeum and Avena species, which together included haploid, diploid and allo-and autopolyploid, and natural and synthetic polyploid examples. Detailed studies in diploid S. cereale, and hexaploid T. aestivum and Triticale showed that FM was present in PMC nuclei during premeiotic interphase, leptotene and zygotene but not at pachytene and later meiotic stages. Moreover, it was most abundant at late premeiotic interphase in T. aestivum, and at leptotene in S. cereale and Triticale, when it occurred in up to 100% of sampled PMC nuclei in an anther. Although FM and synaptonemal complex (SC) occurred together in some PMC nuclei at later stages, FM was present long before SC, and reached its peak of abundance before SC did. Bundles of FM often formed links at their ends between either two masses of chromatin, or more rarely, between chromatin and the nuclear membrane. Individual bundles of FM varied in length but showed roughly similar ranges of lengths and widths in these three species. They were up to about 0.2 μm in diameter and about 3 μm in length, equivalent to about 20% of the maximum diameter of the nuclei containing them. Reconstructions of PMC nuclei indicated that FM was never associated with centromeres but was sometimes, and perhaps usually, associated with telomeric or sub-telomeric chromosome segments. The function of FM is unknown but its possible role is discussed in relation to (1) previously described intranuclear inclusions in meiocytes and (2) the cytogenetics and developmental behaviour of meiotic nuclei in the wheat comparium. As FM was a constant and characteristic structural component of PMC nuclei, its presence is probably of functional significance to the meiotic process. If so, it may function before, and over greater distances, than SC in establishing or maintaining the coorientation of chromosomes prerequisite for normal chromosome pairing. As FM was most abundant at stages when major chromosome movements occur, yet its distribution was non-centromeric, it is suggested that it may function in the attachment and movement of telomeres at the nuclear membrane formed after premeiotic mitosis. The possibility that a bundle of FM normally links corresponding sites on two homologues is considered.
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  • 5
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The distribution and excretion of a single tracer dose of cadmium-109 given intravenously to rats were studied in a 60-day time course experiment. The organs that accumulated the most cadmium were the liver, kidneys, and pancreas. Initial high plasma levels decreased rapidly, and most of the cadmium that remained in the blood after 24 hr was found in the red cells. In most organs and tissues a level was reached within 24 hr at which the cadmium concentration remained relatively stable. Kidney was a marked exception because the amount of cadmium found in that organ increased progressively. Excretion of cadmium was found to be predominantlyvia the feces. Twenty-five to 28% of the dose was excreted by that route in 60 days, the most rapid phase occurring during the first three days. Less than 0.15% of the dose was excretedvia the urine.
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  • 7
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Liver Cd-binding proteins (Cd-BP) were isolated from rats chronically treated with109Cd-labeled CdCl2 for ten days. Fractions purified using Sephadex G-75 and DEAE-Sephadex were characterized and found to be similar to those isolated by other investigators. Cd-binding was not saturated in any of the preparations and significant amounts of Cu and Zn were also found bound to the proteins. The percentage of saturation for Cd-BP1, and Cd-BP2 was independently determined by atomic absorption spectrometry and spectroscopy at 254 nm. These results indicate that the fraction of binding sites unoccupied by Cd on Cd-BP approaches 20%in vivo.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In preparation for a survey to investigate the prevalence of mandibular pain dysfunction syndrome (MDS) in a non-hospital group of individuals, the measure of agreement obtained by two observers when recording signs and symptoms of MDS in the same subjects was investigated. The criteria used for this purpose are defined. Two groups of subjects, 50 MDS patients and 50 individuals not complaining of the condition, were examined independently. Considerably more agreement between the two observers was reached with regard to patients than contrast subjects. Both observers showed more agreement in assessment during the opening movement of the mandible. It is suggested, therefore, that in order to reduce the observer error inevitably present during a survey, the signs and symptoms which manifest themselves during the opening movement, of the mandible should be used to diagnose MDS rather than a more elaborate time-consuming technique.
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  • 9
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Rezeptive Felder von 32 Zellen im primärvisuellen äusseren Teil des Grosshirns unbetäubter, abgerichteter Affen wurden abgesteckt. Davon zeigten 97% der Zellen Vergrösserung der eckigen Abmessungen auf der nahen Fläche. Diese Grösse-Einstellung unterstützt unsere Vorstellung eines «Zoom-Modells» der Grössen-Konstanz.
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  • 10
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird gezeigt, dass die normale proteolytische Tätigkeit von stimulierten peritonealen Makrophagen der Maus durch das Benzo-pyron-Cumarin in vitro beträchtlich erhöht wird.
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