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  • 1
    Electronic Resource
    Electronic Resource
    The name game (1990)
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 203-204 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/344203c0
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  • 2
    Electronic Resource
    Electronic Resource
    Culture deposits (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 391-391 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Some years ago, the story goes, on receiving a refusal to a request for a certain virus, the enterprising petitioner succeeded in isolating the virus from the envelope that enclosed the reply. Most workers make newly described microbes accessible and deposit living cultures in a publicly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361391c0
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  • 3
    Electronic Resource
    Electronic Resource
    Macrophage tumoricidal mechanisms are selectively altered by prenatal chlordane exposure (1992)
    Springer
    Inflammation research 37 (1992), S. 140-146 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Macrophages (mø) derived from mice treatedin utero with chlordane show a significant delay of tumoricidal induction activity. In this study, mø from chlordane-treated animals required a 48 hin vitro period of induction with interferon-ψ and lipopolysaccharide (IFN/LPS) before they could kill P815 targets. Similarly, mø from chlordane-treated animals also failed to produce an immediate H2O2 burst upon perturbation. Conversely, their stimulated control mø counterparts were tumoricidal by 2 h and exhibited a respiratory burst without any delay. Moreover, levels of the second messenger, inositol triphosphate (IP3), were significantly delayed in chlordane-treated animals following interaction with IFN/LPS. When nitrate/nitrite production was analyzed as an alternate mechanism for killing tumors, stimulated mø from both normal and chlordane-treated animals responded equally. The data show that chlordane differentially introduces defects in mø biochemical mechanisms associated with tumor killing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987903
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  • 4
    Electronic Resource
    Electronic Resource
    The measurement of222Rn in drinking water by low-level liquid scintillation counting (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 161 (1992), S. 357-364 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Radon-222 (Rn) has universally been found in well water. Non-stagnant ground water is collected at the well head while the well is pumping. The water is adjusted to a slow, non-aerated, steady flow through a clear tube, and a 500 ml glass bottle is filled. The sample is tightly capped after a high meniscus has developed. In the laboratory, standard 22 ml glass vials are filled with 10 ml of a toluene based mineral oil LS cocktail. Then, two 5 ml sample aliquots are pipetted into the vial. Vials are capped tightly, shaken vigorously, and placed in the liquid scintillation (LS) counter. Secular equilibrium is established in approximately 4 hours, after which samples are counted for 100 minutes each. The counting efficiency for Rn and progeny ranges between 315 to 345 percent depending on the chosen spectral window. The average background is about 6 cpm. A total of 28 wells were tested for Rn in the Carefree-Cave Creek, Arizona, USA area. The area's geometric average Rn concentration was found to be 46.5 Bq·l−1. The associated estimated lung dose is 0.51 mSv·y−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040482
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  • 5
    Electronic Resource
    Electronic Resource
    Cattle grazing and pine survival and growth in subterranean clover pasture (1990)
    Springer
    Agroforestry systems 10 (1990), S. 161-168 
    Details
    ISSN: 1572-9680
    Keywords: Agroforestry ; electric fence ; injury ; loblolly pine ; slash pine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract When combining pines and cattle on tame pasture, grazing is often delayed for several years until trees are large enough to resist injury. As an alternative approach to delayed or deferred grazing during the early years, this study in central Louisiana, USA, examined the effects of cattle grazing in subterranean clover (Trifolium subterraneum L.) pastures on slash (Pinus elliottii Engelm.) and loblolly pine (P. taeda L.) seeding survival and growth during the first 3 years of tree establishment. Pines were planted at about 1200 trees/ha in 3 rows on 0.4-ha subclover units with 1.3 m spacing within rows. Three grazing treatments included: (1) ungrazed pines, (2) limited grazing with a single-wire electric fence above the planted pines, and (3) grazed pines. Thirty Brahman crossbred cows with calves and a bull grazed the tame pasture on a controlled grazing, rotational basis from December through May each year, during the subterranean clover growing season. Pine trampling injury during the year was 8% on the grazed seedlings while essentially none occured under limited grazing. During the first 2 growing seasons, survival and height of the pines were significantly less on the grazed seedlings than on either the limited grazing or ungrazed seedlings. Pine heights from the limited grazing and ungrazed treatments were not different during the 3-year study; loblolly pine heights from the limited grazing treatment continued to be taller than the grazed treatment through the third year while the slash pine heights were similar for all treatments by the third year. Seedling mortality became more acute as severity of grazing injury increased; the greatest mortality occured when the terminal bud and needles were both browsed off.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115364
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  • 6
    Electronic Resource
    Electronic Resource
    Lipopolysaccharide and opioids activate distinct populations of Mytilus edulis immunocytes (1991)
    Springer
    Cell & tissue research 264 (1991), S. 317-320 
    Details
    ISSN: 1432-0878
    Keywords: Invertebrates ; Immunocytes ; Lipopolysaccharide ; Opioids ; Mytilus edulis (Mollusca)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Studies in Mytilus edulis have indicated that immunoregulatory activities comoparable to those in vertebrates also exist in invertebrates. Mytilus immunocytes resemble cells of the vertebrate monocyte/macrophage lineage and are activated by similar substances. We searched for differential effects of opioids on these cells in comparison with those of lipopolysaccharide (LPS), in order to determine if different subpopulations of immunoactive hemocytes are involved. We showed that Mytilus immunocytes respond to LPS in a fashion similar to that in vertebrate granulocytes by flattening, and increasing in cellular perimeter and mobility, that LPS administered in vivo results in a lowering of the number of free hemocytes that can be obtained from the animal, and that distinct immunoactive cell populations seem to exist since apparently different subsets of cells react when exposed to LPS or opioids and the opioid antagonist naloxone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313968
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  • 7
    Electronic Resource
    Electronic Resource
    The role of pyruvate decarboxylase in the Kluyver effect in the food yeast, Candida utilis (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 7 (1991), S. 479-487 
    Details
    ISSN: 0749-503X
    Keywords: Pyruvate decarboxylase ; yeast ; Candida utilis ; Kluyver effect ; glycosidase ; β-glucosidase ; anaerobic sugar fermentation ; aerobiosis ; anaerobiosis ; activation ; deactivation ; catabolite repression ; enzyme induction ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The glucose-fermenting yeast, Candida utilis cannot use the β-D-glucoside, cellobiose, anaerobically, although it is able to do so aerobically. β-Glucoside transport and hydrolysis and pyruvate decarboxylase activities of this yeast were measured aerobically and anaerobically. β-Glucoside transport was five-fold faster aerobically than anaerobically, but there was no corresponding difference in β-glucosidase activity. Pyruvate decarboxylase activity varied greatly, being synthesized de novo in response to the presence of D-glucose and anaerobic conditions and about 50% deactivated on the removal of D-glucose or the addition of air. Activation and deactivation were rapidly reversible. Failure to utilize cellobiose anaerobically, in particular, and the Kluyver effect, in general, probably depends on much reduced glycolytic flux, associated under anaerobic conditions, with (i) lower transport rate, (ii) low substrate affinity of the relevant glycosidase and (iii) deactivation of pyruvate decarboxylase. So, in addition to the complex effects of oxygen, anaerobiosis and specific sugars on induction, repression and derepression, there are fine controls on pyruvate decarboxylase activity, leading to fast activation or deactivation of the enzyme.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320070507
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  • 8
    Electronic Resource
    Electronic Resource
    Passage of molecules through yeast cell walls: A brief essay-review (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 7 (1991), S. 313-323 
    Details
    ISSN: 0749-503X
    Keywords: Yeasts ; cell walls ; porosity ; proteins ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320070402
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  • 9
    Electronic Resource
    Electronic Resource
    The taxonomy of the genus Saccharomyces meyen ex reess: A short review for non-taxonomists (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 8 (1992), S. 1-23 
    Details
    ISSN: 0749-503X
    Keywords: Saccharomyces ; taxonomy ; yeasts ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320080102
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