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  • 1
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    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 4:2 (1978:Apr.) 197 
    ISSN: 0305-7488
    Topics: Geography
    Description / Table of Contents: The Americas
    Notes: Reviews
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  • 2
    ISSN: 1476-5535
    Keywords: Keywords: echinocandin B deacylase; substrate specificity; evolution/technology; antifungal agent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aspergillus nidulans produces echinocandin B, a neutral lipopeptide. A deacylase from Actinoplanes utahensis catalyzes cleavage of the linoleoyl group from echinocandin B, a key step in generating a potential antifungal agent. Virtually all (99.8%) deacylase activity was cell-associated. The deacylase was salt-solubilized, heat-treated and purified to apparent homogeneity by a 3-step chromatographic procedure. The enzyme was a heterodimer consisting of 63- and 18-to-20-kDa subunit, optimally active at pH 6.0, and at 60°C with salt. The K m of the deacylase for echinocandin B was 50 μM and its V max was 14.6 μmol cyclic hexapeptide min−1 mg−1protein. The substrate specificity of the enzyme was broad with respect to both acyl and cyclic peptide analogues of echinocandin B. The two deacylase subunit genes were cloned and over-expressed in Streptomyces lividans. The recombinant deacylase was purified from the culture filtrate to apparent homogeneity by a 1-step chromatographic procedure. Using the recombinant deacylase, an enzymatic deacylation of immobilized echinocandin B resulted in the generation of cyclic hexapeptide at gram-level. Journal of Industrial Microbiology & Biotechnology (2000) 24, 173–180.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9001
    Keywords: Epoxides ; ring conformation ; naphthalene derivatives ; crystal structure determination ; hydroxyepoxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of the derivative of tetrahydronaphthalene with substituent epoxy, hydroxyl, and methyl groups in the more saturated ring (r-1-hydroxy-t-2-methyl-t,t-3,4-epoxy-1,2,3,4-tetrahydronaphthalene) has been determined. The hydroxyl and methyl groups are both found to beequatorial. The crystal structure is characterized by chains of molecules linked by O-H ⋯ O hydrogen bonds involving the hydroxyl groups; these hydrogen bonds lie approximately parallel to theb axis. The conformations of the epoxide-bearing rings in various hydroxy epoxides are compared and shown to be similar.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 563 (1988), S. 180-184 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zur Kristallchemie der Verbindungen des Typs MX · MgX2 · 6H2OVon den Verbindungen des Typs MX · MgX2 · 6 H2O wurden unter Variation der M+- und X--Ionen die Doppelsalzhexahydrate CsCl · MgCl2 · 6 H2O, Li(H2O)Cl · MgCl2 · 6 H2O, NH4Br · MgBr2 · 6 H2O, RbBr · MgBr2 · 6 H2O. CsBr · MgBr2 · 6 H2O, KI · MgI2 · 6 H2O, NH4I · MgI2 · 6 H2O und RbI · MgI2 · 6 H2O synthetisiert. Durch röntgenographische Untersuchungen an Pulverpräparaten wurden die Gitterparameter und die Raumgruppe bestimmt. Aus den Ergebnissen wurde die Zuordnung zu Strukturtypen vorgenommen. Danach besteht die Struktur aus einer Verknüpfung aller (M+)X6--Oktaeder untereinander über gemeinsame Ecken zu perowskitanalogen Baueinheiten, in deren Hohlräumen die Mg(H2O)62+-Oktaeder angeordnet sind. Ein “Toleranzfaktor” t von 1,045 bis 1,061, berechnet aus den Radienverhältnissen, stellt ein Charakteristikum für die obere Existenzgrenze dieser Struktur dar. Carnallit besitzt einen höheren Wert und deshalb eine andere Struktur.
    Notes: The following MX · MgX2 · 6H2O compounds (double salt hexahydrates) were synthesized by variation of the M+ and X- ions: CsCl · MgCl2 · 6 H2O, Li(H2O)Cl · MgCl2 · 6H2O, NH4Br · MgBr2 · 6 H2O, RbBr · MgBr2 · 6 H2O, CsBr. MgBr2 · 6 H2O, KI · MgI2 · 6 H2O, NH4I. Mgl2 · 6 H2O and RbI · MgI2 · 6H2O. By X-ray analysis of powder samples the lattice parameters and the space group were determined. On the basis of the results thus obtained, an identification with structural types was carried out. In accordance with the findings, the structure is made up of (M+)X6-octahedra which are linked into perovskite type units by sharing vertices. Their interstices are occupied by the Mg(H2O)62+ octahedra. A “tolerance factor” t which has been calculated on the basis of the proportion of radii and which attains values between 1.045 and 1.061 is a criterion for the upper limit of the area of existence of this structure. Carnallite has a higher to value and, therefore, a different structure.
    Additional Material: 2 Tab.
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  • 5
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In einem abgeschlossenem System wurde unter dynamischen und quasiisothermen und quasiisobaren Bedingungen im Temperaturbereich zwischen 20°C und 300°C oder 600°C das Schmelz- und Zersetzungsverhalten der Doppelsalze MBrMgBr2·6H2O (mitM=K, NH4, Rb, Cs) untersucht. DTA-Heiz- und Kühlzyklen zeigen das Schmelzverhalten der Doppelsalze und geben gleichzeitig Auskunft über den Schmelzpunkt dieser Verbindungen. Die thermische Zersetzung der Doppelsalze unter quasiisothermen und quasiisobaren Bedingungen erfolgt ausgehend von der Schmelze (mit Ausnahme von RbBrMgBr2·6H2O) und unter vermindertem Druck ausgehend vom Feststoff. Ein Doppelsalz des Typs MBrMgBr2·2H2O wird als Zwischenprodukt gebildet. Das Endprodukt bei allen Zersetzungstypen sind basische Produkte mit unterschiedlichem Hydroxidoder Oxidgehalt.
    Notes: Abstract The melting and decomposition behaviour of the double salts MBr·MgBr2·6H2O (M=K, NH4, Rb, Cs) has been investigated in a closed system under dynamic and quasi-isothermal and quasi-isobaric conditions between 20°C and 300°C or 600°C, respectively. DTA heating and cooling cycles illustrate the melting behaviour of the double salts and give information on the melting point of these substances. The thermal decomposition of double salts under quasi-isothermal and quasi-isobaric conditions takes place in the melt (with the exception of RbBr·MgBr2·6H2O) and under reduced pressure in the solid phase. A double salt of the type MBr·MgBr2·6H2O is formed as a stable intermediate. The final product of all types of thermal decomposition are basic products with different hydroxide or oxide contents, respectively.
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  • 6
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Schmelz- und Zersetzungseigenschaften des Carnallits wurden im geschlossenen System unter dynamischen Heizbedingungen und im offenen System under dynamischen und quasi-isothermen und quasi-isobaren Bedingungen im Temperaturbereich von 20 bis 300°C untersucht. DTA Heiz- und Kühlzyklen im geschlossenen System verdeutlichen das inkongruente Schmelzen des Carnallits und das Auftreten verschiedener Magnesiumchlorid-Hydratphasen. Die thermische Zersetzung beginnt unter quasi-isothermen und quasi-isobaren Bedingungen bei einem Druck von mindestens 100 kPa aus der Schmelze und unter verminderten Druck aus der festen Phase. Die Zersetung verläuft stets über KCl · MgCl2 · 2 H2O zu einem basischen Produkt KMgCl2.84–2.90(OH)0.10–0.16.
    Abstract: Резюме Плавление и разложен ие карналлита исследовано в закрыт ой системе в режиме динамического нагре ва и в открытой систем е — в динамических и квази-изотермических, квази-изобарных Vслов иях в области темпера тур 20–300°. ДТА измерения циклов наг рева и охлаждения в закрыт ой системе показали инконгруэнтное плав ление и случаи образования различн ых гидратов хлорида м агния. В квази-изотермическо м и квази-изобарном режимах термическое разложение начинает ся при давлении около 100 кПа из расплава, а при пониже нном давлении — из тве рдого состояния. В любом слу чае образуется соединение KCl · МдСl2 · 2 Н2О, которое разлагает ся с образованием основн ой соли KМgСl2.84–2.90(ОН)0.10−0.16.
    Notes: Abstract The melting and decomposition behaviour of carnallite was investigated in the closed system under dynamic heating conditions and in the open system under dynamic and quasi-isothermal and quasi-isobaric conditions in the temperature range between 20 and 300°. DTA heating and cooling cycles in the closed system illustrate the incongruent melting of carnallite and the occurrence of different magnesium chloride hydrate phases. The thermal decomposition under quasi-isothermal and quasi-isobaric conditions begins at a pressure of at least 100 kPa from the melt and under reduced pressure from the solid. In any case KCl · MgCl2 · 2 H2O is formed which is decomposed to a basic product KMgCl2.84–2.90(OH0.10–0.16.
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  • 7
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The plant Arabidopsis thaliana (Arabidopsis) has become an important model species for the study of many aspects of plant biology. The relatively small size of the nuclear genome and the availability of extensive physical maps of the five chromosomes provide a feasible basis for ...
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  • 9
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The higher plant Arabidopsis thaliana (Arabidopsis) is an important model for identifying plant genes and determining their function. To assist biological investigations and to define chromosome structure, a coordinated effort to sequence the Arabidopsis genome was initiated in late 1996. Here we ...
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  • 10
    ISSN: 0378-1119
    Keywords: Biocatalysis ; de-esterification ; heterologous expression ; nucleotide sequence ; β-lactam antibiotic carboxy-esters
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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