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  • 1
    Electronic Resource
    Electronic Resource
    Colony migration in the tropical honey beeApis dorsata F. (Hymenoptera: Apidae) (1994)
    Springer
    Insectes sociaux 41 (1994), S. 129-140 
    Details
    ISSN: 1420-9098
    Keywords: Honey bees ; Apis dorsata ; dance language ; colony migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To obtain insights into the organization and adaptive significance of seasonal migration by colonies of the giant honey bee,Apis dorsata, we monitored the arrivals and departures of colonies in a rain forest habitat in northeastern Thailand, compared patterns of honey bee abundance with other measures of habitat variability, and observed the role of dance communication in organizing the migratory departure of a colony. Colonies arrived in the area during the end of the dry season, reproduced, and then departed early in the rainy season. During the immigration phase, early-arriving colonies stayed only temporarily, as if assessing habitat quality. Colonies departing after a long stay always left barren combs behind, suggesting that they had left in response to deteriorating resource quality. These observations support the idea that migration allows colonies to track seasonally varying resources in different regions. Our observations of a colony preparing for migration revealed that the dance language is involved in organizing the colony's departure, but that dancers signal only the direction to be taken, rather than, as in dances to feeding sites, both the direction and distance of a particular location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240473
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  • 2
    Electronic Resource
    Electronic Resource
    In pre-sterol carrier protein 2 (SCP2) in solution the leader peptide 1 – 20 is flexibly disordered, and residues 21 – 143 adopt the same globular fold as in mature SCP2 (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 751-759 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Sterol carrier protein 2; protein expression; protein structure; nuclear magnetic resonance; N-terminal leader peptide.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The preform of the rabbit sterol carrier protein 2 (pre-rSCP2) was cloned, the uniformly 15N-labelled protein expressed in Escherichia coli and studied by three-dimensional 15N-resolved nuclear magnetic resonance spectroscopy. In spite of its low solubility in aqueous solution of only ∼0.3 mM, sequential 15N and 1H backbone resonance assignments were obtained for 105 out of the 143 residues. From comparison of the sequential and medium-range nuclear Overhauser effects (NOEs) in the two proteins, all regular secondary structures previously determined in mature human SCP2 (hSCP2) [Szyperski et al. (1993) FEBS Lett. 335: 18–26] were also identified in pre-rSCP2. Near-identity of the backbone 15N and 1H chemical shifts and 1 : 1 correspondence of 24 long-range NOEs to backbone amide groups in the two proteins show that the residues 21 – 143 adopt the same globular fold in pre-rSCP2 and mature hSCP2. The N-terminal 20-residue leader peptide of pre-rSCP2 is flexibly disordered in solution and does not observably affect the conformation of the polypeptide segment 21 – 143.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050203
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for differences in alpha-adrenergic receptor affinity in stress susceptible swine (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 1343-1344 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary pA2-Values were determined using phentolamine-methoxamine. The mean pA2-value on aortic strips from stress susceptible swine was 7.81 and 7.39 for control. The α-adrenergic receptor from stress susceptible swine has a higher affinity than that of control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954940
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  • 4
    Electronic Resource
    Electronic Resource
    Deep-water benthic algae of the Florida Middle Ground (1974)
    Springer
    Marine biology 27 (1974), S. 185-190 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The composition and seasonality of the benthic algae of the Florida Middle Ground, an offshore area of extensive reef outcroppings, 25 to 60 m deep in the eastern Gulf of Mexico, are described. Collections and observations were made by SCUBA diving during June, July, and September, 1971, and January 1972. Ninety-one algal species (92 taxa) were obtained, including 6 species newly reported for Florida and the eastern Gulf of Mexico. The flora is predominantly tropical, with Caribbean affinities. Marked seasonal differences in species diversity and abundance were present. An extensive or well-anchored holdfast system was a common feature of those species which appeared to be perennial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391942
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  • 5
    Electronic Resource
    Electronic Resource
    Generalized bases inP-spaces (1970)
    Springer
    Mathematische Annalen 189 (1970), S. 319-324 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01359715
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  • 6
    Electronic Resource
    Electronic Resource
    Chern characters of certain complexes (1962)
    Springer
    Mathematische Zeitschrift 80 (1962), S. 363-373 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01162393
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  • 7
    Electronic Resource
    Electronic Resource
    Rapid Evolution of the Ribonuclease A Superfamily: Adaptive Expansion of Independent Gene Clusters in Rats and Mice (1999)
    Springer
    Journal of molecular evolution 49 (1999), S. 721-728 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Ribonucleases — host defense — eosinophils — evolution — rodents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The two eosinophil ribonucleases, eosinophil-derived neurotoxin (EDN/RNase 2) and eosinophil cationic protein (ECP/RNase 3), are among the most rapidly evolving coding sequences known among primates. The eight mouse genes identified as orthologs of EDN and ECP form a highly divergent, species-limited cluster. We present here the rat ribonuclease cluster, a group of eight distinct ribonuclease A superfamily genes that are more closely related to one another than they are to their murine counterparts. The existence of independent gene clusters suggests that numerous duplications and diversification events have occurred at these loci recently, sometime after the divergence of these two rodent species (∼10–15 million years ago). Nonsynonymous substitutions per site (d N) calculated for the 64 mouse/rat gene pairs indicate that these ribonucleases are incorporating nonsilent mutations at accelerated rates, and comparisons of nonsynonymous to synonymous substitution (d N / d S) suggest that diversity in the mouse ribonuclease cluster is promoted by positive (Darwinian) selection. Although the pressures promoting similar but clearly independent styles of rapid diversification among these primate and rodent genes remain uncertain, our recent findings regarding the function of human EDN suggest a role for these ribonucleases in antiviral host defense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006594
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  • 8
    Electronic Resource
    Electronic Resource
    On key storage in secure networks (1995)
    Springer
    Journal of cryptology 8 (1995), S. 189-200 
    Details
    ISSN: 1432-1378
    Keywords: Keys ; Secure networks ; Probabilistic construction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider systems where the keys for encrypting messages are derived from the pairwise intersections of sets of private keys issued to the users. We give improved bounds on the storage requirements of systems of this type for secure communication in a large network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191355
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  • 9
    Electronic Resource
    Electronic Resource
    An HLA-C-specific DNA probe (1986)
    Springer
    Immunogenetics 23 (1986), S. 115-120 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Analysis of available nucleotide sequence data for class I HLA genes has established that the seventh intron is one of the gene regions which expresses the highest degree of locus specificity (the percentage sequence divergence between nonallelic genes minus the percentage sequence divergence between allelic genes). We have subcloned short DNA sequences including this region from the HLA-Cw3 gene. Two clones, pC250 and pC800, were tested by hybridizing them at high stringency to a panel of clones containing class I HLA genes. Under conditions permitting a strong hybridization signal with a C-locus gene, pC800 also expressed a weak but significant hybridization to other class I genes, while pC250 appeared to hybridize exclusively to the C-locus gene. Hybridization of the pC250 probe at high stringency to Hind III-digested genomic DNA from a panel of unrelated individuals and homozygous typing cell lines revealed a single band in all cases. However, equivalent hybridization against Eco RI-digested DNA revealed two hybridization bands, one at 7.9 kb which correlated with the serologically defined Cw5 and Cw8 alleles, and one at 7.6 kb which correlated with the Cw1, Cw2, Cw3, Cw4, Cw6, and Cw7 alleles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377971
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  • 10
    Electronic Resource
    Electronic Resource
    Extended MHC haplotypes and CYP21/C4 gene organisation in Irish 21-hydroxylase deficiency families (1991)
    Springer
    Human genetics 〈Berlin〉 87 (1991), S. 361-366 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We have analysed fifteen classical 21-hydroxylase deficiency families from throughout Southern Ireland and report the serologically defined HLA-A, HLA-B, HLA-Cw, HLA-DR, C4A and C4B polymorphisms that characterize the inferred disease haplotypes. Additionally, we have used a combination of short and long range restriction mapping procedures in order to characterize the CYP21/C4 gene organization associated with individual serologically defined haplotypes. The results obtained indicate that disease haplotypes are characterized by a high frequency (33%) of CYP21B gene deletion and 8 out of 10 such deletion haplotypes are represented by the extended haplotype HLA-DR1, C4BQo, C4A3, HLA-B40(w60), HLA-Cw3, HLA-A3. Large scale length polymorphism in the CYP21/C4 gene cluster was found to conform strictly to a variable number of tandem repeats model with 4 alleles being detected. Disease haplotypes in which defective CYP21B gene expression is inferred to result from pathological point mutations show extensive diversity of associated HLA markers and include two examples of the extended HLA haplotype HLA-DR3, B8, Cw7, A1 haplotype, which has previously been reported to be negatively associated with 21-hydroxylase deficiency. One unusual disease haplotype has two CYP21 + C4 units, both of which appear to contain CYP21B-like genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200920
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