bluuebunny/crossref_metadata_2025_split huggingface dataset:
Microbial methane oxidation in the River Saar
Authors: Zaiss U. , Winter P. , Kaltwasser H. 
Published: June 2010

AbstractIn the River Saar, the distribution of methane‐oxidizing bacteria and their metabolic activity were determined in vertical and longitudinal profiles. At the sediment surface about two orders of magnitude more methane oxidizers were detected than in the overlying water. In the river as well as in laboratory experiments, the rate of methane oxidation was closely related to the concentration of methane. Most of the methane produced by methanogenic bacteria in the sediment escaped into the atmosphere. On the average only 1.2% of the produced methane was oxidized in the water phase.
Mikrobielle Seitenkettenabspaltung von Phenylharnstoffen und Carbonsäureaniliden
Authors: Lechner U. , Straube G. , Köhler M. 
Published: June 2010

AbstractA Gram‐ negative rod‐shaped bacterium 28/1 isolated by enrichment cultures is able to hydrolyze the amide bond of some phenylurea herbicides and acid anilide herbicides by an inducible amidase. 7.5% of 0.3 μmol. ml−1 linuron (3‐(3,4‐dichlorophenyl)‐1‐methoxy‐1‐methylurea) are hydrolyzed after 16 hours. 1,1‐Dimethylphenylureas are not degraded. Acid anilides are hydrolyzed at a higher rate, 80% of 0.5 μmol. ml−1 N‐(4‐chlorophenyl)‐propionamide and N‐(4‐nitrophenyl)‐propionamide are transformed after 6 hours. The 1‐methoxy‐1‐methyl phenylureas are effective inducers. Linuron‐induced cells have a specific activity of 3—4 nmol per mg dry weight per min on the substrate N‐(3,4‐dichlorophenyl)‐propionamide (Propanil). The rate of hydrolysis is influenced by substituents of the aniline ring and by the structure of the side chain of the acid anilides.
The localization of SPO1 phage resistance in the genome of Bacillus subtilis as revealed by fusion of protoplasts
Authors: Mach F. , Jatzwauk L. 
Published: June 2010

AbstractWe localized the gene for resistance to phage SPO1 relatively to the markers pur B 34 and ura by means of the polyethylene‐glycol induced fusion of bacterial protoplasts of three‐fold auxotrophic Bacillus subtilis strains S3 and S13. By this same method, the site of some auxotrophic markers was tentatively determined. The application of the protoplast fusion technique to exact genetic analysis will not be possible until the exo‐ and endogenous factors influencing cell wall regeneration are standardized. Fluctuations of this kind are very significant for the determination of genetic segregation.
Untersuchungen zur Erhaltung des Plasmids pBR 322 in diskontinuierlicher Kultur von Escherichia coli K12 C600
Authors: Wiehle W. , Hecker M. , Mach F. 
Published: June 2010

AbstractThe maintenance of the plasmid pBR 322 in E. coli K12 C600 recB recC was investigated during successive discontinuous cultures. The percentage of tetracyclin resistant cells, the plasmid content and the β‐lactamase activity decrease during growth, indicating the segregation of plasmid‐free cells. The amount of plasmid‐free segregants which overgrow the plasmid‐containing bacteria, depends on the generation number of growth. By contrast, in C600 rec+ (pBR 322) the plasmid is maintained more stable during prolonged incubation. These results suggest the involvement of the recB recC‐gene product in plasmid maintenance.
Microbial transformation of bile acids. A unified scheme for bile acid degradation, and hydroxylation of bile acids
Authors: Hayakawa S. 
Published: June 2010

AbstractThrough the isolation and identification of a wide variety of degradation products formed from bile acids by microorganisms, a unified scheme for the complete degradation of bile acids to carbon dioxide and water has been proposed and discussed. The proposed degradative pathways mainly consist of the following steps: natural C24 3‐hydroxy bile acids → 3‐oxo bile acids → Δ4‐3‐oxo bile acids → → C16 or C18 perhydroindane derivative (at least in two ways) → → (4→)‐4‐methyl‐5‐oxo‐octanedioic acid (at least in three ways) → → CO2 and H2O.A microbial hydroxylation method for the preparation of bile acid samples was investigated which could be used as reference standards in the analysis of bile acids in biological materials and also as materials for studying the function of bile acids. The particular fungi, Curcularia lunata NRRL‐2380, Helicostylum piriforme ATTC‐8992 and Pestalotia foedans ATCC‐11817 effected the 1β‐, 11β‐, 12β‐, 15α‐ or 15β‐hydroxylation of certain bile acids and gave the following products: 1β,3α‐, 3α,12β‐ and 3α,15β‐dihydroxy‐5β‐cholan −24‐oic acids, 3α,12β,15α‐ and 3α,12β, 15β‐trihydroxy‐5β‐cholan‐24‐oic acids and 12β,15β‐dihydroxy‐3‐oxo‐5β‐cholan‐24‐oic acid from‐lithocholic acid; 1β,3α,12α‐ and 3α,12α,15β‐trihydroxy‐5β‐cholan‐24‐oic acids and 3α, 11β‐dihydroxy‐12‐oxo‐5β‐cholan‐24‐oic acid from deoxycholic acid; 3α, 7α, 12β‐trihydroxy‐5β‐cholan‐24‐oic acid 3α,7α,12β, 15α‐tetrahydroxy‐5β‐cholan‐24‐oic acid from chenodeoxycholic acid; 3α‐6α,12β‐ and 3α,6α, 15β‐trihydroxy‐5β‐cholan‐24‐oic acids from hyodeoxycholic acid; 3α, 7β, 12β trihydroxy‐5β‐cholan‐24‐oic acid from ursodeoxycholic acid; 3α,12β‐dihydroxy‐7‐oxo‐5β‐cholan‐24‐oic acid from 3α‐hydroxy‐7‐oxo‐5β‐cholan‐24‐oic acid. Some of these products were new compounds and their structures were determine.
Factors regulating the steroid 11‐hydroxylation by non‐germinating spores of Cunninghamella elegans (LENDNER)
Authors: Jaworski A. , Sedlaczek L. , Wilmańska D. , Sasiak A. , Strycharska A. 
Published: June 2010

AbstractIn the presence of malate or citrate sporangiospores of C. elegans were able to hydroxylate cortexolone with a rate twofold exceeding that of the control, water suspended spores. Analysis of the intracellular nicotinamide coenzyme pools revealed an increased NADPH: (NADP+ + NADPH) ratio, indicating more effective NADPH‐generating systems in malate‐ or citrate‐stimulating spores.Swollen spores remaining in the pregermination state, retained higher cortexolone‐hydroxylating activity in the absence of malate and citrate. In these spores degradation of endogenous alanine and glutamic acid was observed. Possible NADPH‐generating systems in C. elegans sporangiospores were discussed.
New anthracycline antibiotics produced by interspecific recombinants of streptomycetes. IV. Antimicrobial activity of iremycin
Authors: Fleck W. F. , Schlegel Brigitte , Ihn W. 
Published: June 2010

AbstractThe in vitro antimicrobial activity of iremycin (10‐(α‐L‐rhodosaminyl)‐gamma‐rhodomycinone) was determined in comparison to that of doxorubicin, a 14‐hydroxy‐derivative of daunorubicin, which exhibited a strong antitumor activity and is useful in chemotherapy of human tumors. The MIC values determined by means of a standardized agar diffusion plate test indicated a lower antimicrobial activity of iremycin in vitro in comparison to that of doxorubicin. In contrast to doxorubicin, iremycin was highly active against Mycobacterium smegmatis, but fivefold less active than doxorubicin against Staphylococcus aureus, sevenfold less active against Bacillus subtilis, and twentyfivefold less active against Commamonas terrigena. Furthermore, iremycin was hundredfold less active against a highly sensitive permeation mutant of Pseudomonas aeruginosa. No inducing activity on prophages in lysogenic E. coli cells was demonstrable for iremycin and no growth inhibition in the repair test was observable. In contrast, iremycin inhibited the multiplication of λ‐phages in the BIP test, but the MIC values of violamycin BI, doxorubicin and iremycin in this test system indicated that iremycin is twohundredfiftyfold less active than violamycin BI and tenfold less active than doxorubicin. No serum binding was demonstrable for iremycin.
Immobilization of glucose isomerase
Authors: Suekane M. 
Published: June 2010

AbstractThe immobilization of glucose isomerase (D‐xylose ketol isomerase, EC 5.3.1.5) by covalently bonding to various carriers and by adsorption to ion exchange resins was attempted in order to obtain a stable immobilized enzyme which can be used for continuous isomerization of glucose in a column.Of the covalent bonding methods, the colloidal silica‐glutaraldehyde method showed the highest binding capacity and gave the stablest immobilized glucose isomerase. The LUDOX HS‐30 bound glucose isomerase column showed a half‐life of 24 days and an enzyme usage of 0.07 units per gram of isomerized sugar (d.s., fructose 45%).Of the resins used, the macromolecular type or porous type strongly basic anion exchange resins showed the highest binding capacity and gave the stablest immobilized glucose isomerase. The Amberlite IRA‐904 resine‐bound glucose isomerase showed a half‐life of 23 days and an enzyme usage of 0.06 units per gram of isomerized sugar (d. s., fructose 45%).Based on the ease of the immobilization process, the possibility of carrier ruse the extensive use already achieve by ion exchange resins in the sugar industry, IRA‐904 resin was selected as the candidate for commercialization.
Effect of short‐chain alcohols on production of NADP‐glycohydrolase by Streptomyces griseus
Authors: Gräfe U. 
Published: June 2010

AbstractShort‐chain alcohols as e.g. methanol and ethanol were found to suppress both the formation of NADP‐glycohydrolase by S. griseus and the excretion of enzyme into the medium. The results suggest that the generation of enzyme represents a compartmentized process in which membrane structure is involved.
Effect of L‐valine and L‐isoleucine on fatty acid composition of Streptomyces hygroscopicus and S. griseus
Authors: Gräfe U. , Roth M. , Krebs D. 
Published: June 2010

AbstractThe effects of L‐valine and L‐isoleucine on the composition of mycelial fatty acids were investigated during growth of differentiation parent strains, of Streptomyces hygroscopicus and Streptomyces griseus as well as their non‐differentiating derivatives (Amy− strains) on a synthetic medium. Both in the Amy+ and Amy− strains, in the presence of L‐valine, the portion of the isopalmitic acid (iC16:0) increased, but the addition of L‐isoleucine led to an elevated level of the 12‐methyltetradecanoic acid (aC15:0). The results suggest that the genetically determined alterations in he ratio of both fatty acids in the non‐differentiating derivatives may be due to specific changes in the biosynthetic pathways of both amino acid precursors rather than due tro changes of their catabolism.
Relation of anabolic‐catabolic glucose utilization in growth‐limited cultures of Streptomyces griseus
Authors: Christner A. , Bormann E. J. , Reiche R. 
Published: June 2010

AbstractPhenotypically different submerged mycelium conserves had been produced from a spore conserve of the HP‐strain Streptomyces griseus and proofed in a product formation culture as a test system.The phenotypical characters induced on the base of the genotype proved in a cultivation cycle during 30–34 reduplications of the biomass constant.Employing the HP phenotype we investigated the possibility of economizing the substrate turnover by utilizing the anabolic potential for the synthesis of secondary substances and/or reducing the conservation catabolism during the stationary growth stage. As criteria for that served the stoichiometric turnover equation of the streptomycin biosynthesis and the quotient qO2/qGluc taking at full substrate oxidation the numerical value 6.During the stationary growth stage the relation of maintenance anabolism to maintenance catabolism in addition to the formation as secondary substances is not fixed in the tested HP phenotypes, but in a striking manner variable. The relation of by‐product synthesis to secondary metabolism synthesis, too, is variable in the stationary growth stage with constant maintenance catabolism. Due to those response reactions on phenotypical manipulations an economization of the substrate turnover during the product formation stage with stationary growth is not possible in the streptomycin producer Streptomyces griseus.
Development of breeding stocks of the yeast Saccharomycopsis lipolytica by methods of moderate inbreeding
Authors: Kurischko Cornelia , Inge‐Vechtomov S. G. , Weber H. 
Published: June 2010

AbstractSporulation parameters of genetically labelled strains, derived from a wild strain of the alkane‐utilizing yeast Saccharomycopsis lipolytica were improved by a breeding program using brother‐ssister crosses. Sporulation frequency, the number of four‐spored asci and viability of ascospores could be significantly enhanced. To date a number of genetically well‐defined strains is available that have good sporulation parameters and show a 1:1 segregation pattern of markers suitable for genetic analysis.
Robotic surgery of the infratemporal fossa utilizing novel suprahyoid port
Authors: McCool Ryan R. , Warren Frank M. , Wiggins Richard H. , Hunt Jason P. 
Published: June 2010

AbstractObjectives/Hypothesis:To develop a minimally invasive technique for robotic access to the infratemporal fossa and describe use of a novel suprahyoid port placement.Study Design:A cadaveric study to assess feasibility of robotic dissection of the infratemporal fossa using a novel, midline suprahyoid port placement.Methods:Six complete and two partial dissections of the infratemporal fossa were carried out on one fixed and three fresh cadaveric heads using the da Vinci surgical robot (Intuitive Surgical, Inc., Sunnyvale, CA). The suprahyoid port site was utilized to place one robotic arm into the vallecula. The second arm and 30° camera were placed transorally, and dissections were performed through the lateral pharyngeal wall and into the infratemporal fossa with identification and preservation of the lingual nerve, inferior alveolar nerve, internal and external carotid arteries, jugular vein, and cranial nerves IX–XII. Surgical clips were placed at the extent of dissection, and computed tomography (CT) imaging was obtained after dissections.Results:The transoral and midline suprahyoid port sites provide excellent access to the infratemporal fossa. The midline port site has excellent utility for accessing wide areas of the skull base bilaterally. CT imaging shows surgical clips placed successfully at the skull base foramina of major neurovascular structures.Conclusions:Robotic surgery offers several advantages over traditional endoscopic surgery with the addition of tremor‐free, two‐handed technique and microscopic three‐dimensional visualization. A midline suprahyoid port placement provides minimally invasive access for excellent exposure of the infratemporal fossa bilaterally. Laryngoscope, 2010
Determination of total polar material in frying oil using accelerated solvent extraction
Authors: Zainal  , Isengard Heinz‐Dieter 
Published: June 2010

AbstractDuring use, frying fats undergo chemical deterioration. This leads to the formation of compounds that are more polar than the triacylglycerols of the fat. Collectively these are called total polar material (TPM), and the mass concentration of TPM is used as an indicator of the quality of frying fats. According to official methods, the fat or oil is separated into polar and non‐polar fractions by preparative column chromatography (PCC). The chromatographic step is time‐consuming and needs large amounts of solvents. Here we show that the chromatographic step can be replaced by accelerated solvent extraction (ASE). This was demonstrated for high‐oleic sunflower oil in which potatoes, carrots and parsnips were fried. The materials separated by these two procedures are shown to be identical as judged by HPLC of the TPM. The two procedures show good agreement.
Weitere Bemerkungen zu Extremalproblemen bei im Mittel quasikonformen Abbildungen
Authors: Kirsch Siegfried 
Published: June 2010

AbstractEs wird ein Extremalproblem in einer Klasse Q(z)‐quasikonformer Abbildungen untersucht, deren Dilatation im Integralmittel beschränkt ist. Mit Hilfe notwendiger und hinreichender Extremalitätsbedingungen werden einige Beziehungen zwischen den Extremalfunktionen zu verschiedenen Integralmittelschranken hergeleitet und Extremalfunktionen bei speziellen Mittelungsprozessen analytisch konstruiert.
A Class of Infinitesimal Generators and Time Reversal for the Corresponding One‐Dimensional Markov Processes
Authors: Weber M. 
Published: June 2010

AbstractA class of infinitesimal generators A of strongly continuous nonnegative contraction semigroups in a subspace of C[0, 1] is introduced. It contains the class of generators of regular gap diffusions. A construction of the Markov process X generated by A gives some stochastic interpretations of the integral term which appears in A. The infinitesimal generator of the time reversal of X (with respect to its life time) is explicitly given. It belongs to the introduced class of generators too. Thus, the considered class is invariant under this transformation. Two examples, the time reversal of gap diffusions with nonlocal boundary conditions and the time reversal of processes with Levy‐measure, complete the note.
Scattering Matrices in the Theory of Unitary Extension of Isometric Operators
Authors: Arov D. Z. , Grossman L. Z. 
Published: June 2010

AbstractDie Arbeit enthält eine ausführliche Darlegung der in der Bemerkung [2] angekündigten Resultate. Sie ist stark beeinflußt von den langjährigen Forschungen M. G. Kreins über verallgemeinerte Resolventen und Resolventenmatrizen und stellt eine Weiterentwicklung derselben dar. Wesentlich wird auf Brodskii's Beitrag zur Theorie unitärer Operatorknoten zurückgegriffen. Das zentrale Resultat der Arbeit ist Theorem 2, welches eine Formel zur Beschreibung der Streumatrizen aller unitären Erweiterungen eines vorgegebenen isometrischen Operators im Hilbertraum liefert. Aus diesem Resultat werden einige aus der Literatur bekannte klassische Spezialfälle wie etwa die Formel von H. Langer hergeleitet.
On the Distributions δk and (δ')k
Authors: Koh E. L. , Kuan Li Chen 
Published: June 2010

AbstractPowers and products of distributions have not as yet been defined to hold true in general. In this paper, we choose a fixed δ‐sequence and use the concept of neutrix limit to give meaning to the distributions δk and (δ')k for some k. These may be regarded as powers of Dirac delta functions.
On weak and Moments Convergence of Randomly Indexed Sums
Authors: Krajka A. , Rychlik Z. 
Published: June 2010

AbstractLet {Xn, n ⩾ 1) be a sequence of independent random variables such that EXn = an, E(Xn − an)2 = σ, n ⩾ 1. Let {Nn, n ⩾ 1} be a sequence of positive integer‐valued random variables. Let us putIn this paper we present necessary and sufficient conditions for weak and moments convergence of the sequence {(S‐Ln)/sn, n ⩾ 1}, as n → ∞. Hermite polinomial type limit theorems are also considered. The obtained results extend the main theorem of M. Finkelstein and H. G. Tucker (1989).
Correspondance de Langlands‐Kazhdan explicite dans le cas non ramifié
Authors: Henniart Par Guy 
Published: June 2010

AbstractSoit F un corps local non archimédien à corps résiduel fini, et soit E une extension non ramifiée de F, de degré n. On dispose de plusieurs procédés pour associer, à chaque caractère régulier de Ex, une classe de représentations admissibles irréductibles supercuspidales de GLn(F). L'un est totalement explicite et est dû à P. Gérardin. Un autre, obtenu par l'utilisation globale de formules des traces, est dû à D. Kazhdan. Nous décrivons ici explicitement le lien entre ces deux procédés.
Weighted Weak Behaviour of Fourier‐Jacobi Series
Authors: Guadalupe José J. , Pérez Mario , Varona Juan L. 
Published: June 2010

AbstractLet w(x) = (1 ‐ x)α (1 + x)β be a Jacobi weight on the interval [‐1, 1] and 1 < p < ∞. If either α > −1/2 or β > −1/2 and p is an endpoint of the interval of mean convergence of the associated Fourier‐Jacobi series, we show that the partial sum operators Sn are uniformly bounded from Lp,1 to Lp,∞, thus extending a previous result for the case that both α, β > −1/2. For α, β > −1/2, we study the weak and restricted weak (p, p)‐type of the weighted operators f→uSn(u−1f), where u is also Jacobi weight.
Transcendency Results for Sums of Reciprocals of Linear Recurrences
Authors: Becker Paul‐Georg , Töpper Thomas 
Published: June 2010

AbstractSuppose that {Rn}n≥0 is a linear recursive sequence andd≥ 2 is an integer. Under suitable conditions on {Rn} anddwe show thatand similarly constructed numbers are transcendental. Special attention is given to the case of binary recurrences.
Weighted Triebel‐Lizorkin Spaces on Locally Compact Vilenkin Groups
Authors: Kitada Toshiyuki , Onneweer C. W. 
Published: June 2010

AbstractLet G be a locally compact Vilenkin group. We consider the atomic and molecular decomposition of the weighted Triebel‐Lizorkin spaces on G. As an application of it we prove boundedness results for certain pseudodifferential operators on such spaces.
Dirichlet Problems in Polyhedral Domains I: Regularity of the Solutions
Authors: Lubuma Jean Mbaro‐Saman , Nicaise Serge 
Published: June 2010

AbstractThe solution of the Dirichlet problem relative to an elliptic operator in a polyhedron has a complex singular behaviour near edges and vertices. Here we show that this solution and its conormal derivative have a global regularity in appropriate weighted Sobolev spaces. We also investigate some compact embeddings of these spaces. The present results will be applied in a forthcoming work to the constructive treatment of the problem by optimal convergent finite clement method and boundary element method.
On Some Characteristics of Anisotropic Fibre Processes
Authors: Beneš Viktor , Chadœuf Joël , Ohser Joachim 
Published: June 2010

AbstractThis paper derives properties of various estimators of length intensity of stationary random fibre processes inRd.The projections of the process ontoR1and intersections with a system of parallel (d‐ 1)‐dimensional hyperplanes are studied. The estimation variances are expressed by means of pair correlation functions of appropriate random measures. The results are formulated for the anisotropic models in arbitrary dimension. Explicit formulas are obtained for the anistropic Boolean segment process.
On a Distributional Equation in Information Theory
Authors: Deeba Elias , Koh E. L. , Xie Shishen 
Published: June 2010

AbstractIn this paper the functional equation will be reformulated in distributions. Operators in appropriate function spaces will be introduced to mirror functional operations. Then a solution will be given for the equation in distributions. Finally it is pointed out that for regular distributions the distributional solution reduces to the classical one.
A Stochastic Characterization of Arov‐completable Matrix‐valued Schur Functions
Authors: Fritzsche Bernd , Kirstein Bernd 
Published: June 2010

AbstractA (p + q) × (p + q) matrix‐valued inner function S in the unit disc 𝔻 is called (p, q)‐type Arov‐inner if in the block partition . the p × p diagonal block S11 and the q × q diagonal block S22 are outer matrix‐valued functions. A holomorphic p × q matrix‐valued function f in 𝔻 is called Arov‐completable if there is a (p, q)‐type Arov‐inner function S such that S12 = f Arov‐completability of a given p × q Schur function f is characterized in terms of a (p + q)‐variate stationary sequence (Xn) ϵ Z) in Hilbert space which is naturally associated with f. The necessary and sufficient condition for Arov‐completability is an orthogonality condition for certain backward and forward innovation vectors generated by (Xn) ϵ Z.
Quadrature Rules for the Surface Integral of the Unit Sphere Based on Extremal Fundamental Systems
Authors: Reimer M. 
Published: June 2010

AbstractQuadrature rules for the surface integral of the unit Sphere Sr–1 based on an extremal fundamental system, i.e., a nodal system which provides fundamental Lagrange interpolatory polynomials with minimal uniform norm, are investigated. Such nodal systems always exist; their construction has been given in earlier work. Here the main results is that the corresponding interpolatory quadrature for the space of homogeneous polynomials of degree two is equally weighted for arbitrary r, and hence positive. For the full quadratic polynomial space we can prove positivity of the weights, only.