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  • 1
    ISSN: 1572-8773
    Keywords: cadmium ; cell culture ; culture medium ; ICP-MS ; K-562 ; mercury ; selenium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Effects of some metals on the growth of cultured human erythroleukemia K-562 cells were investigated when grown in two different types of media based upon RPMI-1640 or Ham's F-10. The study on proliferation, using RPMI-1640 supplemented with sodium selenite, selenomethionine, mercuric chloride, methylmercuric chloride and cadmium nitrate showed no inhibition of growth at concentrations of 2.5, 25, 25, 2.5 and 25 μM, while at 75, 250, 50, 5 and 50 μM toxicity was apparent. Selenite at 5–50 μM and selenomethionine at 50–100 μM inhibited the growth. In Ham's F-10 supplemented with the same compounds no inhibition was found at concentrations of 5, 10, 25, 1 and 50 μM, while at 50, 100, 50, 5 and 75 μM toxic effects were noted. Selenite 10 μM and selenomethionine 25-50 μM inhibited the proliferation. Measurements of trace element levels in pellets of K-562 cells grown in RPMI-1640 or Ham's F-10 unveiled higher cell contents of cadmium and selenium in cells grown in RPMI-1640, being consistent with higher concentrations of these elements in that medium. Manganese and mercury concentrations were higher in cells grown in Ham's F-10 correlating with a higher medium concentration of these elements. The growth responses and cellular uptake differed between the metals and the selenocompounds and although extrapolating the results to humans is difficult the selenium exposures were in approximately the same order of magnitude as in human exposures. The compounds could be ranked according to decreasing toxicity as: methylmercuric chloride 〉 mercuric chloride, cadmium nitrate, sodium selenite 〉 selenomethionine.
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  • 2
    ISSN: 1572-8773
    Keywords: lead ; mercury ; metals ; nickel ; radiation effects ; selenium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Effects of Pb2+, Ni2+, Hg2+ and Se4+ on cultured human glioma U-343MG cells were investigated considering uptake, toxicity and, in combination with radiation, clonogenic cell survival. The cells were exposed to 0-100 μm of the metals for a week before the evaluation. The tests showed a tendency to toxicity with 10 μm nickel although not significant (P 〉 0.05). Selenium, lead and mercury exerted a significant toxicity (P 〈 0.05) at 2.5 μm, 10 μm and 1 μm, respectively. To challenge the clonogenic cell survival capacity, the cells were irradiated with60Co photons after being exposed to the highest nontoxic concentration of the different metals. The clonogenic cell survival tests, after irradiation, showed no significant change if the cells were exposed to 5 μm nickel, 0.5 μm selenium or 5 μm lead compared with those not exposed. Mercury, 0.1 μm, gave a relative reduction in survival compared with only irradiated cells of 58 ± 17%. Thus, only mercury affected the radiation-induced damage and/or repair. When exposed to the highest nontoxic concentrations of the different metals, the cultures did not display a significant uptake ratio (metal concentration ratio of exposed cells to control cells) of nickel (3.1 ± 3.3), only a small uptake ratio of selenium (4.0 ± 0.4), while there was a large uptake ratio of both lead (2.6 ± 1.7) x 102 and mercury (1.5 ± 0.2) x 101. The results indicated that nickel was neither especially toxic nor influenced the clonogenic cell survival after irradiation. Mercury was more toxic and also influenced the radiation sensitivity. Lead was taken up strongly but did not influence the radiation sensitivity. Selenium accumulated but gave no detectable effect on the radiation sensitivity.
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  • 3
    ISSN: 1572-8773
    Keywords: cell culture ; ICP-MS ; retention ; selenite ; selenomethionine ; uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The selenium uptake and retention have been studied in K-562 cells exposed to selenite or selenomethionine. In the uptake experiments the cells were exposed to two doses of selenite (5 or 50 μM) or selenomethionine (10 or 50 μM). In the retention study the cells were treated for 2 h with the above mentioned doses of the selenocompounds before being observed at different times. The selenium uptake in cells exposed to selenite 5 μM began to saturate at 8 h, but increased again between 48 and 96 h. In cells exposed to selenite 50 μM the selenium uptake never reached a maximum, however, at 48 and 96 h the cell viability decreased strongly. The two doses of selenite showed different retention patterns, with a relatively small cellular decrease of selenium after treatment with selenite 5 μM compared to treatment with 50 μM of selenite. The selenium uptake in cells exposed to selenomethionine 10 μM or selenomethionine 50 μM began to saturate at 24 h and 48 h, respectively. The retention patterns were similar for both selenomethionine doses with a continuous decrease of the selenium concentration during the whole observation period. The results indicated a more controlled uptake and retention pattern of selenomethionine compared to selenite.
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  • 4
    ISSN: 1572-8773
    Keywords: coxsackievirus ; inflammation ; mouse ; myocarditis ; trace elements ; virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract During most infections the plasma levels of trace elements change, but it is not clear if this reflects changes in the infected tissues. Coxsackievirus B3 (CB3) infection may result in viral replication, subsequent inflammation and changed trace element levels in the myocardium. In the present study, the trace element levels in the plasma and heart of adult male A/J mice were determined during the pre-inflammatory stage (day 4) of CB3 myocarditis for the following trace elements: aluminium (Al), arsenic (As), calcium (Ca), cobalt (Co), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), selenium (Se), silver (Ag), vanadium (V) and zinc (Zn). The severity of the infection was assessed through clinical signs of disease and trace element levels were measured through inductively-coupled plasma mass-spectrometry (ICP-MS). In the heart, the levels decreased for V (59%; p 〈 0.01), Co (38%; p 〈 0.01), Al (81%; p 〈  0.01), As (66%; p 〈 0.01) and Se (16%; p 〈 0.01). Increased levels were detected for Mn (13%; p 〈 0.05), Fe (48%; p 〈 0.01), Cu (34%; p 〈 0.01) and Ag (46%; p 〈  0.01). In the plasma, decreases were detected in the level of Zn (32%; p 〈 0.05), whereas increases were seen in Mn (362%; p 〈 0.05), Fe (272%; p 〈 0.01), Co (71%; p 〈 0.05), Cu (25%; n.s.) and Mg (43%; p 〈 0.01) levels. A correlation was found between the levels in plasma and myocardium for Co (r s=−0.636; p 〈 0.05), Fe (r s=0.764; p 〈 0.05), Mn (r s=0.682; p 〈 0.05) and Mg (r s=−0.791; p 〈 0.05). Thus, determination of some of these trace elements in the plasma may be useful to indicate target tissue involvement in the early pre- inflammatory stage of an infectious disease. Some of these elements are important nutrients for the immune system, while others may be associated with the development of disease complications, such as cardiac arrhythmias.
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  • 5
    ISSN: 1573-4935
    Keywords: pancreatic B cell ; diabetes mellitus ; islets of Langerhans ; exocrine pancreas ; proton microprobe analysis ; Chinese hamster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Diabetes mellitus spontaneously develops in certain sublines of non-obese Chinese hamsters, and the diabetic L-subline is known for subnormal pancreatic insulin releasein vitro. The cause of the secretory defect is unknown. Freeze-dried pancreas sections from genetically diabetic Chinese hamsters and normal controls were subjected to proton bombardment and the concentration of 15 elements in B cells and acini was calculated from the X-rays emitted. Diabetic B cells contained significantly less Al (−61%) and significantly more Cu (+92 %), Mg (+6 %) and Rb (+13 %) than their normal counterparts. The diabetic acini showed similar, significant changes. The molar ratio between K and Na was about 10 in endocrine as well as exocrine pancreas from both groups of animals, implying that neither sample preparation nor irradiation had induced significant diffusive changes. In conclusion, the high K/Na ratio suggests that the diabetic B cell has a well-functioning Na+/K+ pump. However, significant and parallel changes in Al-, Cu-, Mg- and Rb-levels were found in both the B cells and acinar portion of the diabetic pancreas. It is not clear whether these elemental changes cause the islet secretory defect or result from it.
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  • 6
    ISSN: 1573-4935
    Keywords: C57BL KsJ-db/db mice ; pancreatic B cell ; diabetes mellitus ; Islets of Langerhans ; exocrine pancreas ; proton microprobe analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Freeze-dried pancreas sections from 7-, 17-and 27-week-old genetically diabetic (db/db) and normal (±/±) mice were subjected to proton bombardment and the concentrations of 15 elements in B cells and exocrine pancreas were calculated from the characteristic X-rays emitted. In the 7-week-old diabetic animals, B cells contained significantly above-normal levels of Na and S, while exocrine pancreas contained subnormal levels of Ca, and excess Mn. The B cells from the 17-week-old diabetic animals contained subnormal levels of Cu and the exocrine pancreas of the 27-week-old diabetic animals was deficient in Cd. The 7-, 17- and 27-week-old, genetically diabetic (db/db) mice were hyperglycemic, hyperinsulinemic and heavier than age-matched normal (±/±) mice. Although significant changes were found in elemental composition when comparing both B cells and exocrine pancreas at different ages, the changes were not consistent. Therefore, it appears as if the measured elemental changes were random and not related to the onset of diabetes.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 28 (1994), S. 254-258 
    ISSN: 1059-910X
    Keywords: X-ray microanalysis ; Freeze-substitution ; Diffusible ions ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: A comparative study of some aspects of freeze-substitution as a preparative method for X-ray microanalysis of diffusible ions in biological specimens was carried out. Four substitution fluids were compared with each other and with cryosections. As criteria, elemental ratios as determined by X-ray microanalysis of thin sections of mouse pancreas were used. Freeze-substitution for 3 weeks in diethy ether or for 2 days in tetrahydrofurane gave results comparable to those obtained in cryosections. Slow warming to room temperature after freeze-substitution in tetrahydrofurane gave slightly better results than fast warming. Freeze-substitution in acetone resulted in noticeable loss and redistribution of ions and freeze-substitution in methanol gave very poor results. © 1994 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
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  • 8
  • 9
  • 10
    Publication Date: 1988-03-01
    Print ISSN: 0168-583X
    Electronic ISSN: 1872-9584
    Topics: Physics
    Published by Elsevier
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