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  • 36.40  (55)
  • Saccharomyces cerevisiae  (55)
  • Calcinosis
  • Springer  (113)
  • American Meteorological Society
  • Springer Nature
  • 1990-1994  (111)
  • 1980-1984
  • 1965-1969  (2)
  • 1993  (111)
  • 1968  (2)
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  • Springer  (113)
  • American Meteorological Society
  • Springer Nature
  • Wiley-Blackwell  (74)
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  • 1990-1994  (111)
  • 1980-1984
  • 1965-1969  (2)
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  • 1
    ISSN: 1432-0630
    Schlagwort(e): 36.40 ; 61.1.P ; 68.20
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Fullerene powder mixtures with different C60/C70 ratios have been analyzed by a variety of techniques, and results have been compared. The fullerence mixtures have been characterized as solutions in n-hexane by high-pressure liquid chromatography (HPLC) and UV-VIS spectroscopy. Thin films of fullerenes on Au(111) have been prepared from the mixtures by sublimation. The sublimation process has been studied by simultaneous thermogravimetric and differential thermal analyses. Thin fullerene films on Au(111) have been investigated by scanning tunneling microscopy (STM). The STM images show primarily two types of ballshaped molecules arranged in a lattice with hexagonal symmetry (fcc(111) face, nearest neighbour distance: 1 nm). The two species differ in diameter. STM images of films made of mixtures of different C60/C70 ratios show that C70 molecules display a larger apparent diameter (0.8 nm) and corrugation than C60 molecules (0.7 nm). The C60/C70 ratios obtained by counting the corresponding molecular species in the STM images of the thin films are compared to the C60/C70 ratios determined by HPLC on hexane solutions of the mixtures. The observed differences might be explained by different rates of sublimation for the two species. The STM images reveal film defects (vacancies and boundaries) and dynamic processes (displacement of C70 molecules and vacancies). In films prepared to have a C60 coverage of less than one monolayer, stable structural units of the C60(111) surface consisting of three or seven C60 molecules are revealed by STM. Occasionally, substructure within individual fullerene molecules is observed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 2 (1968), S. 30-37 
    ISSN: 1432-0827
    Schlagwort(e): Calcitonin ; Thyroxine ; Hypercalcemia ; Calcinosis ; Parathyroid hormone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Beschreibung / Inhaltsverzeichnis: Résumé Chez le rat, un traitement préalable par la thyroxine ou la calcitonine inhibe les calcifications métastatiques et l'ostéite fibreuse provoquées par un surdosage d'extrait parathyroïdien. Si les deux hormones sont données simultanément, il y a sommation de leurs effets. La calcergie produite par l'administration conjointe d'acétate de plomb par voie intraveineuse et de polymyxinepar voie sous-cutanée est inhibée par la calcitonine mais n'est pas influencée par la thyroxine. Seule la calcitonine diminue l'hypercalcémie produite par l'injection intraveineuse d'acétate de plomb. Le mécanisme d'action des deux hormones est brièvement discuté.
    Kurzfassung: Zusammenfassung Versuche an Ratten ergaben, daß die durch Überdosierung mit Nebenschilddrüsenextrakt herbeigeführte Osteitis fibrosa und Verkalkung der Weichteilgewebe durch Vorbehandlung mit Thyroxin oder Calcitonin verhindert wird. Gleichzeitige Verabreichung beider Hormone ergibt eine Additionswirkung. Die durch intravenöse Injektion von Bleiacetat und nachfolgende subcutane Verabreichung von Polymyxin ausgelöste Hautverkalkung (Calcergie) läßt sich mit Calcitonin, jedoch nicht mit Thyroxin, verhüten. Außerdem wird die durch eine einzige Injektion von Bleiacetat hervorgerufene Hyperkalzämie durch Calcitonin vermindert, während Thyroxin keinen derartigen Einfluß ausübt. Der Wirkungsmechanismus beider Hormone wird kurz besprochen.
    Notizen: Abstract Experiments on rats indicate that pretreatment with thyroxine or calcitonin inhibits the soft-tissue calcification and the osteitis fibrosa induced by parathyroid extract overdosage. When the hormones are administered concurrently there is a summation of their actions. Calcitonin but not thyroxine inhibitits the skin calcification (calcergy) induced by an intravenous injection of lead acetate followed by topical administration of polymyxin. Moreover, calcitonin diminishes the hypercalcemia produced by a single injection of lead acetate, whereas thyroxine is ineffective in this respect. The mechanism of action of both hormones is briefly discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Calcified tissue international 2 (1968), S. 214-228 
    ISSN: 1432-0827
    Schlagwort(e): Calcinosis ; Calcification ; Cartilage ; Collagen ; Mineral metabolism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Beschreibung / Inhaltsverzeichnis: Résumé Les facteurs, influençant la vitesse et l'intensité du phénomène d'association des ions calcium et phosphates avec des fibres contenant du collagène, et préparés à partir du tendon de boeuf par deux méthodes d'extraction différentes, ont été étudiés. Les fibres, obtenues par ces deux méthodes, nécessitent spécifiquement du phosphate pour absorber du calcium et vice versa. L'absorption ionique des deux préparations est inhibée par du Mg++, du pyrophosphate et un peptide acidique, isolé du sérum humain. Alors que les fibres contenant du collagène, préparées selon les deux méthodes, présentent une absorption ionique à des vitesses sensiblement identiques, seule une des méthodes donne une matrice réagissant positivement à la technique de coloration au nitrate d'argent de von Kossa. Etant donné que les deux critères de calcification sont intéressés de façon identique par des conditions de réaction et par des inhibiteurs, il apparait que les deux facteurs sont des manifestations de différents stades de calcification et que des études d'absorption ionique fournissent une base quantitative d'appréciation de la calcification, pouvant être d'importance pour l'étude du mécanisme et de contrôle de la minéralisation tissulaire.
    Kurzfassung: Zusammenfassung Überprüft wurden die Faktoren, welche Geschwindigkeit und Ausmaß der Erscheinung beeinflussen, wobei Calcium- und Phosphationen sich mit den kollagenhaltigen, durch zwei verschiedene Extraktionsmethoden aus Rindersehnen gewonnenen Fasern eng zusammenbinden. Die mit beiden Methoden zubereiteten Fasern benötigen spezifisch Phosphat für die Calciumaufnahme und Calcium für die Phosphataufnahme. Die Ionenaufnahme beider Arten wird durch Mg++, Pyrophosphat und saure, aus dem menschlichen Serum isolierte Peptide gehemmt. Während die nach beiden Methoden präparierten kollagenhaltigen Fasern eine Ionenaufnahme von beinahe gleicher Geschwindigkeit verursachen, ergibt nur eine dieser Methoden eine Matrix, die mit der Silbernitratfärbung nach vonKossa positiv reagiert. Da beide Calcifikationskriterien gleicherweise durch Reaktionsbedingungen und Inhibitoren beeinflußt werden, wird daraus geschlossen, daß beide Erscheinungen verschiedener Stadien des Gesamtcalcifikationsprozesses sind. Untersuchungen über die Ionenaufnahme ergeben eine quantitative Angabe der Verkalkung, welche für die Erforschung des Mechanismus und der Kontrolle der Mineralisation der Gewebe wichtig sein könnte.
    Notizen: Abstract Factors that influence the rate and extent of the phenomenon in which calcium and phosphate ions become firmly associated with collagen-containing fibers prepared from beef tendon by two different extraction methods have been investigated. The fibers produced by both methods specifically require phosphate for calcium uptake and calcium is required for phosphate uptake. Ion uptake by both types is inhibited by Mg++, pyrophosphate, and an acidic peptide isolated from human serum. Whereas the collagen-containing fibers prepared by both methods induce ion uptake at nearly identical rates, only one of the methods produced a matrix that gives a positive response to the silver nitrate staining technique of von Kossa. Since both criteria of calcification are similarly influenced by reaction conditions and inhibitors, it is concluded that both are manifestations of different stages of the overall calcification process and that studies of ion uptake provide a quantitative assessment of calcification which could be of importance for investigating the mechanism and control of tissue mineralization.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    ISSN: 1432-0983
    Schlagwort(e): Glucoamylase ; Gene cloning ; Hormoconis resinae ; Saccharomyces cerevisiae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A cDNA coding for glucoamylase P of Hormoconis resinae was cloned using a synthetic oligonucleotide probe coding for a peptide fragment of the purified enzyme and polyclonal anti-glucoamylase antibodies. Nucleotide-sequence analysis revealed an open reading frame of 1848 base pairs coding for a protein of 616 amino-acid residues. Comparison with other fungal glucoamylase amino-acid sequences showed homologies of 37–48%. The glucoamylase cDNA, when introduced into Saccharomyces cerevisiae under the control of the yeast ADC1 promoter, directed the secretion of active glucoamylase P into the growth medium.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    ISSN: 1432-0983
    Schlagwort(e): Saccharomyces cerevisiae ; Dynamin ; Mitochondria ; GTP binding protein
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The isolation and characterization of MGM1, and yeast gene with homology to members of the dynamin gene family, is described. The MGM1 gene is located on the right arm of chromosome XV between STE4 and PTP2. Sequence analysis revealed a single open reading frame of 902 residues capable of encoding a protein with an approximate molecular mass of 101 kDa. Loss of MGM1 resulted in slow growth on rich medium, failure to grow on non-fermentable carbon sources, and loss of mitochondrial DNA. The mitochondria also appeared abnormal when visualized with an antibody to a mitochondrial-matrix marker. MGM1 encodes a dynamin-like protein involved in the propagation of functional mitochondria in yeast.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Current genetics 24 (1993), S. 307-312 
    ISSN: 1432-0983
    Schlagwort(e): Growth control ; Genetic mapping ; Molecular cloning ; Nucleo-mitochondrial interaction ; Saccharomyces cerevisiae ; Viability of petites
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The PEL1 gene of Saccharomyces cerevisiae is essential for the cell viability of mitochondrial petite mutants, for the ability to utilize glycerol and ethanol on synthetic medium, and for cell growth at higher temperatures. By tetrad analysis the gene was assigned to chromosome III, centromere proximal of LEU2. The PEL1 gene has been isolated and cloned by the complementation of a pel1 mutation. The molecular analysis of the chromosomal insert carrying PEL1 revealed that this gene corresponds to the YCL4W open reading frame on the complete DNA sequence of chromosome III. The putative Pel1 protein is characterized by a low molecular weight of approximately 17 kDa, a low codon adaptation index, and a high leucine content.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    ISSN: 1432-0983
    Schlagwort(e): Saccharomyces cerevisiae ; Papaver somniferum L. ; ARS ; Mitochondrial DNA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The minimal fragment of mitochondrial DNA from Papaver somniferum L. (poppy) able to promote autonomous plasmid replication in the yeast Saccharomyces cerevisiae was sequenced. Sequence analysis of the 917-bp MK4/8 DNA fragment revealed a high AT content, and the presence of two 12-bp sequences differing from the ARS core consensus of S. cerevisiae only by a T and C insertion, respectively. The mitochondrial insert contains a further six 11-bp sequences with one mismatch to the S. cerevisiae core consensus, more then 20 related sequences with two base pair exchanges, numerous direct and inverted repeats, and many copies of a sequence motif called the ARS box. The original 4.2-kb mitochondrial DNA fragment, as well as the minimal 917-bp subfragment in vector pFL1-E (a variant of YIP5, lacking an origin of replication in yeast), were then tested for their ability to replicate autonomously in another fungus, Kluyveromyces lactis.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    ISSN: 1432-0983
    Schlagwort(e): 2-Oxoglutarate dehydrogenase ; Molecular cloning ; Saccharomyces cerevisiae ; Sequencing ; Suppressor ; Yeast
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The activity of mitochondrial 2-oxoglutarate dehydrogenase in S. cerevisiae can be impaired either by the ogd1 or the kgd1 mutation. The OGD1 gene and two suppressor genes were isolated by complementation of the ogd1 mutant. The complementation of the kdg1 mutant by the OGD1 gene, an allelism test, and meiotic mapping, revealed that the ogd1 and kgd1 mutations are allelic. The two mutations were differentiated by the cloned suppressor gene which was able to partially complement ogd1, but not kgd1. The molecular analysis of the suppressor gene revealed its identity with the natural tRNA CAG Gln gene found in the upstream region of URA10.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    ISSN: 1432-0983
    Schlagwort(e): Yeast ; Saccharomyces cerevisiae ; Sporulation mutants ; Reporter genes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Reporter genes consisting of sporulation-specific promoters fused to lacZ were used as markers to monitor the sporulation pathway of the yeast Saccharomyces cerevisiae. Strains transformed with these lacZ gene fusions expressed β-galactosidase (assayable on plates using the substrate 5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside, X-gal) in a sporulation-dependent manner. Mutagenesis experiments performed on transformed strains resulted in the recovery of a number of novel sporulation mutants. Three classes of mutants were obtained: those which overexpressed the reporter gene under sporulation conditions, those which did not express the gene under any conditions, and those which expressed the gene in vegetative cells not undergoing sporulation. On the basis of the blue colony-colour produced in the presence of X-gal these have been described as superblue, white, and blue vegetative mutants, respectively. These were further characterised using earlier reporter genes and other marker systems. This study established that the multicopy reporter plasmids chosen do not interfere with sporulation; they are valid tools for monitoring the pathway and they provide a way to isolate mutations not readily selected by other markers.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Current genetics 24 (1993), S. 461-464 
    ISSN: 1432-0983
    Schlagwort(e): Chromosome fragmentation ; MEL gene family ; Saccharomyces cerevisiae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Nine members, MEL2–MEL10, of the MEL gene family coding for α-galactosidase were physically mapped to the ends of the chromosomes by chromosome fragmentation. Genetic mapping of the genes supported the location of all the MEL genes in the left arm of their resident chromosomes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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