bluuebunny/crossref_metadata_2025 huggingface dataset:
Lactic Dehydrogenase and Radiation-induced Lymphoid Leukaemia in Mice
Authors: Takamori Yasuhiko , Hori Yasuharu , Nishio Kazuo
Published: February 2015

The enzyme activity and the electrophoretic characteristics of lactic dehydrogenase (LDH) in the plasma and different tissues from the mice with radiation-induced lymphoid leukaemia were examined and compared with those obtained from the normal mice. The LDH activity was abnormally increased in the leukaemic plasma. A considerable elevation of the enzyme level was also found both in the leukaemic spleen and in the lymphocytes isolated from it, but not in the liver, kidney, heart and muscle. LDH isozyme patterns were obtained by agar-gel electrophoresis. Each tissue exhibited a characteristic distribution of LDH activity among the separated isozymes. Leukaemic plasma contained much more LDH-5 than normal plasma, showing the pattern similar to that obtained from leukaemic spleen. Kidney and heart from leukaemic mice indicated no difference in the LDH-patterns as compared with those from normal mice.
Zur Isomerie von Tetrazoliumsalzen II
Authors: Schiele C. , Halfar K. , Arnold G. , Vollmer H. P. , Wilhelm A.
Published: February 2015

Durch systematische Untersuchung von Tetrazoliumsalzen mit verschiedenem Anion wie auch verschiedenem Substituenten am C-Arylrest konnte nachgewiesen werden, daß Tetrazoliumsalze generell in verschiedenen Stereoisomeren erhalten werden können.

Eine Modellvorstellung über die durch den C-Arylsubstituenten induzierten Veränderungen in der Elektronendichte-Verteilung des heterozyklischen Systems führte dabei zu einer vernünftig erscheinenden Interpretation der beobachteten Phänomene.
Zur Biosynthese der Apiose I
Authors: Grisebach H. , Döbereiner U.
Published: February 2015

The biosynthesis of apiose in parsley (Apium petroselinum) was investigated by feeding different labeled precursors to shoots of young parsley plants. Apiin was isolated and the distribution of activity between apigenin, apiose and glucose was determined. The radioactivity in C-31 of apiose was determined by periodate oxidation of apiin, and a degradation of apiose-benzylphenylhydrazone yielded the radioactivity in C-1 + C-2. C-3 and C-31 or C-4 of this sugar. The results show that acetate or formate are not precursors for apiose but that all 5 C-atoms of apiose are derived from glucose. Since with glucose-[3,4-14C] as the source of radiocarbon 45% of the radioactivity is located in C-3 and 40% in C-31 of apiose, C-31 of this sugar must originate either from C-3 or C-4 of glucose. Experiments with glucose-[-6-14C-4-T] indicate that C-6 of glucose is lost during its conversion into apiose. 70% of the tritium is located at C-31 in this experiment and with glucose- [U-14C-3-T] as precursor 60% of the tritium is located at C-31.

The results can be rationalized by postulating that the biosynthesis of apiose involves UDP-giucuronic acid as an intermediate which is decarboxylated and undergoes an internal rearrangement with expulsion of C-3.
Zur Biosynthese der Benzoesäuren in Gaultheria procumbens III
Authors: Vollmer Karl-Otto , Grisebach Hans
Published: February 2015

The cinnamic and benzoic acids present in Gaultheria procumbens could be separated by a combination of thin layer, paper, silicic acid, and gas chromatography. After administration of cinnamic-, o-coumaric-, and p-coumaric acid-[3-14C] to this plant, the amount of radioactivity in salicylic, p-hydroxybenzoic, gentisic, protocatechuic, and vanillic acid was quantitatively compared. Whereas all five of the latter acids were radioactive with cinnamic acid as the precursor, onky salicylic and gentisic acid contained radioactivity after administration of o-coumaric acid and only p-hydroxybenzoic, protocatechuic, and vanillic acid were radioactive with p-coumaric acid as the precursor. The results show that the hydroxylation pattern of the benzoic acids can be determined at the cinnamic acid stage.
Existenz von Borwasserstoff-Anionen im Vakuum
Authors: Hortig Günther , Müller Otto , Schubert Klaus Rudolf , Fluck Ekkehard
Published: February 2015

Beim Beschuß von Diboran mit Krypton-Ionen werden Borwasserstoff-Anionen gebildet. Mit einem Massenspektrometer wurden folgende negative Ionen identifiziert: [ΒΗ4]⊖, [Β2Η7]⊖, [B2H5]⊖, [Β3Η8]⊖, [B3H7]⊖, [B4H9]⊖, [Β4Η8]⊖, [B5H10]⊖. Die experimentellen Ergebnisse werden auf der Grundlage der Lipscomb sehen Theorie diskutiert. Für die bisher unbekannten Ionen werden chemische Strukturformeln vorgeschlagen.
Thermodynamische Funktionen und molekulare Polarisierbarkeiten von Thionyl- und Seleninylhalogeniden
Authors: Nagarajan G. , Müller A.
Published: February 2015

Unter Zugrundelegung eines Modelles des harmonischen Oszillators und starren Rotators werden die thermodynamischen Funktionen von Thionyl- und Seleninylhalogeniden für den idealen Gaszustand im Temperaturbereich zwischen 200 und 2000 °K berechnet. Weiterhin werden mit Hilfe der Methode von Lippincott-Stutman die molekularen Polarisierbarkeiten aus einem semi-emprischen δ-Funktionen-Potentialmodell berechnet. Im Falle des SOCl2 stimmt der theoretisch berechnete Wert gut mit dem experimentell ermittelten überein.
Platinum(II) Complexes with Arginine and Histidine
Authors: Nelson Dale D. , Frye Herschel
Published: February 2015

Two new complexes of platinum (II) with alpha amino acids have been prepared and characterized; these are diaquobisarginatoplatinum (II) and diaquotrishistidinatodiplatinum (II) chloride. Efforts to prepare similar complexes with lysine and serine using similar synthetic techniques failed to produce separable compounds. Infrared data, analytical results for carbon and hydrogen, and melting point information support the structures postulated in this report; no success was achieved in determining molecular weight by the Rast method.
Über die mutagene Wirkung von 1-Nitroso-3-nitro-1-methyl-guanidin (NNMG) auf Saccharomyces cerevisiae
Authors: Lingens F. , Oltmanns O.
Published: February 2015

S. cerevisiae- Zellen wurden mit NNMG behandelt. Der Anteil auxotropher Mutanten unter den überlebenden Zellen nahm mit der Einwirkungszeit und dem Grad der Abtötung bis auf 30% zu. Viele der NNMG-induzierten Mutanten wachsen schlecht. Die Abtötungskurven sind nicht linear bei Auftragung im halblogarithmischen Maßstab.
Zur Frage der Beziehungen zwischen Plastoglobuli und Thylakoidgenese in Gerstenkeimlingen
Authors: Sprey Benno , Lichtenthaler Hartmut K.
Published: February 2015

The function of the osmiophilic stroma component of plastids - termed plastoglobuli 1 - has not yet been explained satisfactory. The changing plastoglobuli content during thylakoid-formation in proplastids of etiolated barley seedlings gives some evidence on their function. Before thylakoiddifferentiation proplastids of barley seedlings contain great numbers of plastoglobuli if grown in the dark. During thylakoid-formation, which can be induced in proplastids of etiolated plants by light flashes, the number of plastoglobuli decreases. Thus the plastoglobuli in proplastids of etiolated plants seem to possess the function of an extra-thylakoidal lipid pool, from which the lipids are taken for the synthesis of thylakoids.
Highly Purified Foot-and-Mouth Disease Virus: Optical and Biological Measurements during Zone Electrophoresis in a Glucose Density Gradient
Authors: Matheka H. D. , Bachrach H. L. , Trautman R.
Published: February 2015

Highly purified, concentrated foot-and-mouth disease virus, type A, was homogeneous and monodisperse by carrier-free zone electrophoresis in a glucose density gradient. Virus mobilities in veronal-acetate buffer, pH 8.6 and ionic strength 0.1, were identical whether determined by infectivity or optical methods. Low passage calf-kidney virus had a significantly higher mobility, 3.28 × 10-5 cm2/volt · sec, than high passage virus, 2.84 × 10-5 cm2/volt · sec. Single passages of the high passage virus in baby hamster kidney cells did not change its mobility. Regardless of passage history, storage at 4°C in 0.05 M phosphate at pH 7.5 increased mobilities to about 3.75 × 10-5 cm2/volt · sec with retention of infectivity; some virions broke down to protein and ribonucleic acid. These electrophoretically distinct viruses possessed different absorbance-temperature profiles but identical sedimentation constants.
Untersuchungen über eine mikrosomale N-Demethylase in verschiedenen Organen der Ratte in vitro
Authors: Knecht Margarete
Published: February 2015

Die Aktivität einer mikrosomalen N-Demethylase wurde in vitro bestimmt. Nach Inkubation von Dimethylnitrosamin mit Mikrosomenfraktionen verschiedener Organhomogenate wurden die aus dem Alkylnitrosamin abgespaltenen Methylgruppen als Formaldehyd kolorimetrisch gemessen.

Das Ferment ließ sich in Leber, Niere, Lunge, Milz usw. nachweisen. Das Vorhandensein dieser Demethylasen in verschiedenen Organen wird in seiner Bedeutng diskutiert.
On the Red Intermediate in a Photochemical Reaction of the Mo(CN)8
4⊖ Ion
Authors: Jakób Wiktor , Samotus Alina , Stasicka Zofia , Golebiewski A.
Published: February 2015

There is a disagreement in the literature as to the intermediates and final products of the photochemical reaction of diluted aqueous solutions of K4Mo (CN) 8 . In the article we give arguments to support our view that the formula of the red intermediate ion is [Mo(CN)8(H2O)2]4⊖. In particular we give an answer to recent objections by Perumareddi against such an interpretation. In the theoretical part we also reconsider König's interpretation of the electronic spectrum of [Mo(CN)8]4⊖, in terms of a flattened Archimedean antiprism.
Biosynthese der Mutterkornalkaloide. Einbau von Chanoclavin-I in Ergolin-Derivate
Authors: Gröger D. , Erge D. , Floss H. G.
Published: February 2015

The reaction sequence tryptophan →chanoclavine-I → agroclavine → elymoclavine →lysergic acid derivatives was demonstrated in Claviceps. Incorporation of chanoclavine-I into ergoline derivatives ranged up to 40 per cent. No conversion of elymoclavine or agroclavine into chanoclavine-I could be demonstrated.
Remarks on the Biosynthesis of Gramine
Authors: Breccia Alberto , Crespi Anna Maria
Published: February 2015

The biosynthesis of gramine was tested by growing the germinating barley in media containing pyruvic, 2-14C acid, W-benzyloxycarbonyl-tryptophan β-14C and tryptophan, β-14C. Iso-nicotinylhydrazide was also added in a series of experiments to inhibit the cleaving action of pyridoxal phosphate. The presence of the inhibitor reduces the total uptake of tryptophan and benzyloxycarbonyl-tryptophan by a factor of 15 - 20, while the uptake of pyruvic acid and the total production of gramine were reduced by a factor of only 0.5. This fact suggests an alternative route for the biosynthesis of gramine, when the path via tryptophan is blocked.
Messungen zur irreversiblen Schädigung der Atmung von Krebszellen durch Extremhyperthermie
Authors: Ardenne M. Von , Krüger W.
Published: February 2015

Messungen zum Mechanismus der selektiven Krebszellenschädigung durch Extremhyperthermie werden unter Simulation der in vivo bei Krebsgeschwülsten herrschenden Mangelbedingungen durchgeführt. Wir fanden für pO2 = 7,5 Torr, daß im Fall guter Versorgungslage der Krebszellen (starke Gärung) unter bestimmten Bedingungen bei 43 °C nach 33 Min. und bei 44 °C nach 18 Min. meist sprunghaft ein irreversibler Stopp der Atmung und damit Stopp von Zellwachstum und Zellteilungsfähigkeit eintritt. Weiter wurde gefunden, daß bei der therapeutischen Schädigung von Krebszellen (in guter Versorgungslage) durch Hyperthermie eine „Minimaltemperatur“ besteht, welche bei EMAC-Zellen etwa bei 42,5 °C liegt. Nur der Temperaturbereich der Extremhyperthermie gewährleistet daher echte therapeutische Wirksamkeit. Bei Krebszellen in schlechter Versorgungslage (schwache Gärung) bzw. wenn kein sprunghafter Atemstopp vorausgegangen ist, hat der therapeutische Effekt einen völlig anderen Charakter und besteht in einer fast linear mit der Hyperthermiedauer fortschreitenden Hemmung der Atmung. Die Gegenüberstellung der bei starker und schwacher Gärung erhaltenen Messungen veranschaulicht die Auswirkungen des Vorschlages, zeitweilig während der Therapie, insbesondere der Extremhyperthermie-Therapie, die in vivo Krebszellen-Gärung künstlich durch Steuerung der Blutglucosekonzentration zu verändern.
Zur Abhängigkeit des Glucoseverbrauches von Ehrlich-Mäuse-Ascites-Krebszellen in-vitro von Temperatur und Hyperthermie-Vorbehandlung
Authors: Ardenne M. Von , Reitnauer P. G.
Published: February 2015

Über Messungen der Abhängigkeit des anaeroben Glucoseverbrauches von Ehrlich-Mäuse-Aszites-Carcinomzellen von der Glucose-Konzentration und von der Temperatur wird berichtet. Es zeigt sich, daß die anaerobe Gärung bei Übergang von 38 °C auf 44 °C im Fall eines hohen Glucosespiegels in vitro etwa auf 130% zunimmt und weiter, daß sie unter in-vivo-Bedingungen beim Übergang zu Extremhyperthermie-Temperaturen sich nicht ändert. Messungen über den Einfluß der Extremhyperthermie auf den anaeroben Glucoseverbrauch ließen für den Fall eines hohen Glucosespiegels (starke Gärung) erkennen, daß der beobachtete plötzliche Stopp des Gärungsstoffwechsels nach Hyperthermiedauern eintritt, bei denen die Atmung (Schädigungsmechanismus Typ II) gerade aufgehört hat. Für den Fall eines niedrigen Glucosespiegels (schwache Gärung) wurde gefunden, daß sich die Zeitdauer für den Stopp der anaeroben Gärung durch Extremhyperthermie verringert. Abschließend werden Schlußfolgerungen aus diesen Ergebnissen insbesondere zur Frage des zeitlichen Verlaufes des Glucosespiegel-Anstieges und der relativen Wachstumsbeschleunigung bei Krebsgeschwülsten im Anschluß an einen Extremhyperthermie-Prozeß gezogen.
Elektrophoretische Untersuchungen des „Chlorophyll-Holochroms“ von Nicotiana tabacum L.
Authors: Düvel Dietrich
Published: February 2015

The mode of acting in free electrophoresis was studied with a chlorophyll and protein containing extract, prepared by using digitonine. This extract shows an anodic shifting direction. Within the pH-range of about 4,1 - 8,4 this complex behaves as an uniform homogeneous substance. At pH 9,4 the main part of the digitonine, that was necessary to dissolve the chlorophyll-proteincomplex, splits off being slower than the green chlorophyll containing fraction, the so called “Chlorophyll-Holochrome”. This could be a possibility to isolate this “Chlorophyll-Holochrome” in an aqueous solution, to investigate the structure proteids or even the enzymes of the very first steps in photosynthesis being adjacent to chlorophyll.
Notizen: Die Struktur von 2.4-Dithio-2.4-dichloro-1.3-dimethyl-cyclodiphosphazan, P2Cl2S2N2(CH3)2
Authors: Weiss Johannes , Hartmann Günter
Published: February 2015

Die Struktur des kürzlich von Becke-Goehring,Leichner und Scharf beschriebenen 2.4-Dithio-2.4-dichloro-1.3-dimethyl-cyclodiphosphazan,P2Cl2S2N2(CH3)2 haben wir röntgenographisch bestimmt.
Differentialkalorimetrische Untersuchungen an Tetrazoliumsalzen
Authors: Vollmer H.-P. , Halfar K. , Schiele C.
Published: February 2015

Mit dieser Arbeit wird über Untersuchungsergebnisse mit einer neuen Methode, der differential scanning calorimetry, bei Tetrazoliumsalzen berichtet. Es kann gezeigt werden, daß sie in Ergänzung bekannter Methoden wertvolle Hinweise zur Analyse von Strukturveränderungen organischer Substanzen liefert.
Die Tonminerale in Ölschiefern und in dem Trinidad-Asphalt
Authors: Friedrich Heinz , Hofmann U.
Published: February 2015

Durch die röntgenographische Bestimmung der Tonminerale, des Quarzes, des Calciumcarbonates. des Pyrits und des Siderits und durch die analytische Bestimmung von CaCO3, C, H, N, S und des Glühverlustes wurde die Zusammensetzung von 9 Ölschiefern und von Trinidad-Asphalt ermittelt. Alle Ölschiefer und der Asphalt enthalten als mineralische Hauptkomponente die Tonminerale Illit oder Montmorillonit, oder auch beide zusammen; Kaolinit kommt nicht in allen Proben vor. Quarz, CaCO3, FeS2 und FeCO3 sind keine charakteristischen Bestandteile der Ölschiefer und des Asphaltes

Der Gehalt an organischem C lag bei den Ölschiefern zwischen 9 und 46% und bei dem Asphalt bei 47,5 Prozent.

Nach der Isolierung der Mineralanteile durch Abbau der organischen Bestandteile mit Ozon bei 120 °C und der quantitativen Bestimmung der Restsubstanzen FeCO3, CaC2O4, C, H, N, S und Quarz, des Kationen-Austauschvermögens und der Chemischen Vollanalyse wurden die Strukturformeln der Schichtsilikate von 5 Ölschiefern und dem Asphalt berechnet. Bei 9 Ölschiefern wurde mit sinkendem geologischem Alter vom Cambrium bis zum Eozän ein Wechsel des Hauptminerals von Illit zu Montmorillonit gefunden.

Ein möglicher Einfluß des Tonminerals auf die Bildung des Kerogens im Ölschiefer und die Bildung des Erdöls wird diskutiert.
Mitt. VIII: Die innere Rotation des Ferrocenmoleküls
Authors: Riemschneider R. , Wucherpfennig W.
Published: February 2015

Es werden die Dipolmomente des Chlor- und Bromferrocens bei 20° und des 1.1′-Dichlor- und 1.1′-Dibromferrocens von +5° bzw. —20° bis +130° gemessen. Die Momente der Monohalogenferrocene gleichen denen der Monohalogenbenzole. Aus den Momenten der Dihalogenferrocene und ihrer Temperaturabhängigkeit werden die Energiedifferenzen der 3 verschiedenen Minima der Potentialkurven der inneren Rotation (entsprechend den 3 „antiprismatischen“ Konformationen) berechnet. Durch Vergleich mit den Potentialkurven der 1.2-Dihalogenäthane wird geschlossen, daß die Energieschranken der inneren Rotation im Ferrocen kleiner sind als im Äthan. Mit Hilfe von Annahmen über die Natur der intramolekularen Kräfte wird versucht, die Potentialkurven der inneren Rotation des Ferrocens und seiner Halogenderivate zu berechnen.
Charge transfer-Komplexe von Aminoazofarbstoffen mit Tetracyanchinondimethan
Authors: Damerau W.
Published: February 2015

Aminoazofarbstoffe vom Typ des 4-Dimethylaminoazobenzols (Buttergelb) bilden mit Tetracyanäthylen (TCNE) in Lösung definierte charge transfer (CT)-Komplexe, deren Zusammensetzung 1 : 1 beträgt 1. Wie wir jetzt im Rahmen von Untersuchungen an Molekülkomplexen von Aminoazofarbstoffen2 zeigen konnten, gehen diese Donatoren auch mit dem π-Acceptor 7.7.8.8-Tetracyanchinondimethan (TCNQ) eine analoge CT-Wechselwirkung ein.
Über 5-Hydroxymethyl-cytidin und 5-Hydroxymethyl-cytosin-N-3-β-D-glucopyranosid sowie über reaktionsfähige Vorstufen
Authors: Brossmer Reinhard , Röhm Erich
Published: February 2015

5-Benzyloxymethyl-NNH
2-benzoyl-cytosine (4) is formed from 5-hydroxymethyl-cytosine (1) in 80% yield by benzylation and subsequent benzoylation. The benzylation readily takes place with benzyl alcohol and catalytic amounts of hydrochloric acid in tetrahydrothiophen-1.1-dioxide as solvent. — 4 is quantitatively converted in pyridine at room temperature to a toluene soluble mercury (II) salt 5.

5 condenses easily with 2.3.5-tribenzoyl-D-ribofuranosyl chloride to give the β-nucleoside 6, no a-anomer being found. — The removal of all protecting groups by catalytic hydrogenation and treatment with sodium methoxide or ammonia leads to cristalline 5-hydroxymethyl cytidine 10 (ca. 60% yields based on 1). — In an analogous manner N-3-β-D-glucosyl-5-hydroxymethyl-cytosine 15 is prepared. — Selective removal of certain of the protecting groups in 6 and 11 yields potentially valuable synthetic intermediates.
IX. Nucleinsäuregehalt und Nucleinsäuresynthese nach Röntgenbestrahlung
Authors: Takamori Yasuhiko , Lochmann Ernst-Randolf , Laskowski Wolfgang
Published: February 2015

The amount of DNA and RNA per dry weight as well as the rate of RNA synthesis was determined in a series of almost isogenic and homozygous Saccharomyces strains of different ploidy which had irradiated with different doses of X-rays.

It was found that the RNA content per dry weight showed only a small decrease after irradiation even with high doses. The decrease in the DNA content after irradiation is larger, and it is already maximal at the smallest X-ray dose tested (75 krad) . No further decrease could be observed even after application of 225 krad.

The RNA synthesis is much more radioresistant in all strains tested (haploid-hexaploid) than the colony forming ability. X-ray doses which reduce the colony forming ability of the cells to less than 1% lead to a reduction of the RNA synthesis of only about 50 per cent. The inactivation of RNA synthesis increases with increasing irradiation doses and increasing incubation time after irradiation.

There was only a small difference in the radiosensitivity of the synthesis of soluble or ribosomal RNA.

Genetic effects on the radiation inactivation of the colony forming ability, previously described as “aα-effect” and “AS-effect”, show no influence on the radiosensitivity of cellular nucleic acid content and synthesis.
Zur Synthese von Dirhodium-oktakis(trifluorphosphin)
Authors: Kruck Th. , Derner N. , Lang W.
Published: February 2015

Die reduktive Fluorphosphinierung von Rhodium (III)-chlorid liefert bei sorgfältigem Ausschluß wasserstoffhaltiger Substanzen als erstes mehrkerniges Metall (O)-trifluorphosphin das orangerote, kristalline Dirhodium-oktakis (trifluorphosphin):

2RhCl3 + 6 Cu + 8 PF3

[Rh (PF3) 4]2 + 6 CuCl.

Die flüchtige, hydrophobe Verbindung läßt sich in Äther mittels Kaliumamalgam zum farblosen Kaliumsalz K[Rh (PF3) 4] reduzieren. Bei der Hochdrucksynthese des Rhodiumtrifluorphosphins entsteht außerdem das ebenso flüchtige, rubinrote und kristalline „Chlor-bis (trifluorphosphin)-rhodium“, das allerdings erst bei einer drucklosen Umsetzung von einem Gemenge aus RhCl3 und Kupferpulver rein erhalten wurde. Die unpolare Verbindung, der offensichtlich eine dimere Struktur entsprechend [ClRh (PF3) 2] 2 zukommt, bildet mit Triphenylphosphin den gelben, luftstabilen und planaren Einkernkomplex ClRh (PF3) (P (C6H5) 3) 2, dessen kleines Dipolmoment von μ = 2,23 D eine trans-Stellung der beiden P (C6H5) 3-Gruppen beweist
Untersuchung von Peptid-Derivaten zur massenspektrometrischen Sequenzanalyse
Authors: Prox Axel , Sun Kwok Kun
Published: February 2015

Die vergleichende Untersuchung verschiedener N-Schutzgruppen von Peptiden zeigt, daß Aroylreste und cyclische Acylgruppen für die massenspektrometrische Sequenzanalyse am günstigsten sind. Die Einführung eines Heteroatoms mit bestimmter Isotopenverteilung, wie beispielsweise Chlor, in die N-Schutzgruppe erweist sich als sehr vorteilhaft
Über die Eindringtiefe von Schwermetallsalzionen bei der Nachkontrastierung biologischer Objekte am Dünnschnitt
Authors: Nemetschek Th.
Published: February 2015

Am Beispiel von Kollagenfibrillen sowie Tropokollagen-Segmenten wurde die Eindringtiefe von Phosphorwolframsäure an Dünnschnitten untersucht. Es konnte wahrscheinlich gemacht werden, daß die Eindringtiefe von Fremdionen am Kollagendünnschnitt nur wenig mehr als 50 A beträgt.

Aus chemischen und elektronenoptischen Gründen konnte gefolgert werden, daß zur Bildentstehung des Querstreifenmusters von Kollagen nicht das Objekt in seiner gesamten Dicke beiträgt, sondern nur ein schmaler, objektivnahe gelegener Bereich.

Auf die Bedeutung dieser Erkenntnisse für die elektronenmikroskopische Untersuchung von Dünnschnitten biologischer Objekte wird hingewiesen
Sensitivity to 1-Methylnaphthalene of Whole-body Irradiated Rats
Authors: Scoppa P.
Published: February 2015

Whole-body irradiation of the rat produces a decrease of the urinary excretion of glucuronides originating from the detoxication of 1-methylnaphthalene; in apparent contrast with the conclusion which could be drawn from this finding the rat exposed to X-irradiation has a higher resistance to the toxic action of the hydrocarbon. The results obtained show that the decreased sensitivity to 1-methylnaphthalene is due to the response of the gastrointestinal system of the rat to radiation: in the animals exposed to 400 r of X-rays before the administration of 1-methylnaphthalene, the absorption of the hydrocarbon is strongly delayed and takes place at a much slower rate. These changes may partially explain the so-called “paradoxical effect” of radiation on the sensitivity to certain toxic compounds administered to the rat by oral route
Translocation and Degradation of 14C-Labelled Sevin in Cotton Plant
Authors: Mostafa I. Y. , Hassan A. , Zayed S. M. A. D.
Published: February 2015

The distribution and metabolic fate of Sevin in cotton plant has been investigated using 14C-insecticide labelled at two different sites. Sevin is readily absorbed by the root system. Hydrolytic and nonhydrolytic mechanisms contribute almost equally to the metabolism of the insecticide. A specific esterase hydrolyzes the ester bond to produce 1-naphthol, methylamine and CO2 (24% of the absorbed dose). The liberated methylamine undergoes partly a process of oxidative degradation to CO2. A major metabolite possessing the skeleton CO-C (O) -N-C is probably produced by hydroxylation of the naphthalene ring
Der Einfluß von Hydroxylamin auf die antigene und interferierende Aktivität von Influenzaviren
Authors: Grossgebauer Klaus
Published: February 2015

In der vorliegenden Arbeit wurde der Einfluß von Hydroxylamin auf die interferierenden und antigenen Eigenschaften kompletter Influenzaviren untersucht. Es wurde gefunden, daß nach einer durchgreifenden Hydroxylaminbehandlung (1-m ·Lösung 3-4 Tage bei 20 °C) sowohl die infektiösen als auch die interferierenden Eigenschaften dieser Viruspartikel verloren gehen. Die antigenen Eigenschaften des Virusoberflächenproteins und die antigenen Aktivitäten des im Innern des Virus liegenden Nucleoproteins (S-Antigens) blieben unverändert erhalten. Zusammenhänge zwischen der Virusnucleinsäure und dem Virusinterferenz-Phänomen werden diskutiert
Darstellung und Eigenschaften von Flavin-benzimidazol-dinucleotid
Authors: Zumpe P. , Woenckhaus C.
Published: February 2015

Die Synthese des Coenzymmodells Flavin-benzimidazol-dinucleotid * gelang durch Kondensation von Benzimidazolribotid-imidazolid 1 oder Benzimidazolribotid-guanidiniumamidat 2 mit Flavinmononucleotid. Das Coenzymmodell war enzymatisch nicht aktiv und bildete keinen Enzym-Coenzym-Komplex. Im Absorptionsspektrum konnte eine Extinktionszunahme nach der Spaltung der Pyrophosphatbrücke nur im Bereich von 260 mμ beobachtet werden. Das Molekül liegt daher vermutlich in einer gefalteten Form vor. Ein Komplex zwischen Flavin- und Benzimidazolteil konnte nicht nachgewiesen werden. Eine Fluoreszenzunterdrückung, die im FAD durch die Komplexbildung zwischen Flavin- und Adeninteil bedingt wird 3, wurde im FBD-Coenzymmodell nicht beobachtet.
Änderung der Permeabilität bei der Isolierung von Zellen
Authors: Günther Theodor , Goecke Claus
Published: February 2015

Bei der Isolierung von Zellen mit Trypsin oder EDTA ändert sich die Permeabilität der Zellmembran. Rohrzucker, der normalerweise nicht in Zellen eindringt, penetriert in die enzymatisch oder mechanisch isolierten Zellen. Der K-Gehalt der Zellen nimmt ab, während der Na-Gehalt zunimmt. Diese Änderungen haben sich nach 22-tägigem Wachsen in der Zellkultur noch nicht zurückgebildet.
Vergleichende Untersuchungen zur Photosynthese und Atmung der Blätter von Schwefelmangelpflanzen
Authors: Willenbrink Johannes
Published: February 2015

In the course of our investigations on sulfur metabolism in higher plants possible changes of photosynthesis and respiration induced by sulfur deficiency have been studied. Leaves of S-deficient and normal tomato plants were illuminated in the presence of 14CO2 for various times. After subsequent lyophilization, chloroplasts were isolated using a non-aqueous procedure which prevents leaching of hydrophilic substances out of the plastids. The time course of distribution of phosphoglycerate, sugar mono- and -diphosphates, and of malate between chloroplasts and the cytoplasm was calculated from the 14C-incorporation into the fractions obtained.

Neither a significant difference in the 14C-fixation rate nor remarkable changes of sites of synthesis and of transport of photosynthetic products between chloroplasts and cytoplasm could be observed between normal and S-deficient leaves. However, in S-deficient leaves the percentage of the sugar monophosphates is higher than normal even after 7 min photosynthesis, the 14C-activity in starch is twice as high as in normal leaves, whereas sucrose was labelled only weakly.

The respiration rate measured manometrically, is on a unit leaf area basis, similar to that of normal leaves; protein is not useful as a reference figure owing to the reduced protein content of the deficient leaves. Infiltration of discs of leaves with 14C-sucrose and subsequent measurement of the various 14C-labelled metabolites resulted in a strongly reduced labelling of citrate, malate, aspartate, and glutamate as compared with normal leave cells. Alanine was found to be more radioactive.

Since in addition citrate was less radioactive after 4 min dark fixation of 14CO2 we suggest from our results that the citrate cycle may be inhibited directly or indirectly by S-deficiency and that direct oxidation may dominate in the degradation of glucose in the S-deficient leaf cell.
N.N' -Dimethylacetamidinderivate des Aluminiums, Galliums und Indiums / N,N'-Dimethylacetamidin Derivatives of Aluminium, Gallium and Indium
Authors: Gerstner Franz , Weidlein Johann
Published: February 2015

The interaction of N,N'-dimethylacetamidine with trialkyl derivatives of aluminium, gallium and indium yields dialkylmetal compounds of the structural formula R2M(N2Me2CMe) (M = Al, Ga and In). According to the vibrational data the M2N4C2 skeletons of these dimeric products form a centrosymmetric puckered eight-membered ring, probably with C2h symmetry. The IR-and Raman spectra of the amidine HN(Me)C(= NMe)Me are discussed.
Kinetics of the Alkaline Solvolysis of Trichloroacetate Ion in Water-Ethanol Solutions
Authors: Issa I. M. , Diefallah E . M. , Mahmoud M. R. , El-Nady A. M.
Published: February 2015

Alkaline Solvolysis, Trichloroacetate Ion The alkaline solvolysis of trichloroacetic acid in water-ethanol mixtures have been studied in the presence of 0.40-0.80 M sodium hydroxide within the temperature range 35-70 °C. The rate constant increased with progressive addition of the organic solvent. The dielectric constant effect on the reaction rate was investigated. The radius of the activated complex at different temperatures was calculated. The isocomposition and isodielectric energies as well as the thermodynamic parameters of activation were calculated and their significance in terms of solvent composition has been discussed. It was concluded that the reactant state is extensively higher solvated than the transition state by the highly polar (water) solvent.
Dibrom(dimethylamino)alan und Diiod(dimethylamino)alan. Darstellung und Kristallstruktur / Dibromo(dimethylamino)alane and Diiodo(dimethylamino)alane. Preparation and Crystal Structure
Authors: Ahmed Aftabuddin , Schwarz Wolfgang , Hess Heinz
Published: February 2015

The title compounds were prepared by reaction of dimethylaminoalane with mercury - (II) dibromide and diiodide, respectively, and investigated by X-ray diffraction. Both compounds build structures isotype with that of dichloro(dimethylamino)alane. The molecules exist as dimers with a planar four-membered ring of alternating aluminium and nitrogen atoms. These atoms are four-coordinated. The following bond lengths are found: Al-N 1.94 and 1.95 Å, Al-Br 2.26 Å, Al-I 2.49 Å, N-C 1.50 and 1.55 Å.
Formation of Copper(II) Complexes of 1,3-Diamino-2-propanol in Aqueous Solution
Authors: Lajunen Lauri H.J. , Kivekäs Raikko
Published: February 2015

The complex formation between Cu2+ ions and 1,3-diamino-2-propanol has been studied potentiometrically at 25 °C, constant ionic strength equal to 0.1 M NaClO4, and pH 5-11. The nature of the complexes has been established by examining the standard deviations and values of the agreement index R of different models.
Reactions with Heterocyclic Diazonium Salts, II Synthesis of Some New Pyrazolo[1,5-c]-as-triazines and 1,2,4-Triazolo[1,5-c] -as-triazines
Authors: Elnagdi Mohamed Hilmy , Hamza Elmoghayar Mohamed Rifaat , Fahmy Shereif Mahmoud , Ibraheim Mohamed Kamal Ahmed , Alnima Hikmat Hussein
Published: February 2015

3-Phenylpyrazole-5-diazonium chloride (2) couples with benzoylacetonitrile and with phenacylthiocyanate to yield the corresponding hydrazone derivatives 3 a, b. Whereas 3 a cyclised into the pyrazolo[1,5-c]-as-triazine derivative (4a) upon treatment with concentrated sulphuric acid via elimination of water, treatment of 3 b with the same reagent under the same conditions has resulted in elimination of thiocyanic acid and the formation of the pyrazolo[1,5-c]-as-triazine derivative (4b).

Treatment of 2 with aqueous sodium acetate has afforded the corresponding 3-phenyl-5-diazopyrazole (6). The latter reacted readily with dipolarophiles to yield pyrazolo- [1,5-c]-as-triazine derivatives. Pyrazolo[1,5-c]-as-triazines has also been formed upon treatment of 6 with active methylene compounds. The mechanism of reaction of 2 and 6 with active methylene compounds is discussed.

Diazotization of 5-amino-3-ethyl-1,2,4-triazole nitrate (7) has afforded the corresponding diazonium derivative which coupled with benzoylacetonitrile and with acetoacetanilide to yield the corresponding hydrazones 9 a, b. The latter could be cyclised into 1,2,4-triazolo[1,5-c]-as-triazines by the action of concentrated sulphuric acid
Spectroscopic Studies on Pyrazaboles
Authors: May C. E. , Niedenzu K. , Trofimenko S.
Published: February 2015

The mass spectra of several pyrazaboles of type 1 where R and/or R′ = C2H5 have been studied. The loss of boron-bonded hydrocarbon moieties under electron impact is the predominant feature of all spectra. Some ultraviolet and nuclear magnetic resonance data on compounds of type 1 have been collected; bulky substituents were observed to lead to conformational isomers that can be detected by 13C NMR spectroscopy
Optisch aktive Übergangsmetall-Komplexe, LV [1]. Darstellung und Stereochemie von [C5H5Mo(CO)2 NN’]PF6 mit NN’=Ethylen-diamin und Propylendiamin / Optically Active Transition Metal Complexes, LV [1]. Preparation und Stereochemistry of [C5H5Mo(CO)2NN′]PF6 with NN′=Ethylenediamine and Propylene- diamine
Authors: Brunner Henri , Muschiol Manfred
Published: February 2015

In the reaction of C5H5Mo(CO)3Cl with ethylenediamine and propylenediamine, abbreviated with NN′, the square pyramidal cations [C5H5Mo(CO)2NN′]+ are formed. The diastereoisomeric pairs of enantiomers of the propylenediamine derivative are separated by fractional crystallization. The epimerization at the asymmetric Mo atom (τ1,2 = 30 min, 75 °C, CD3OD solution) can be followed by 1H NMR spectroscopy
Chemilumineszenz der SO2-Oxidation / Chemiluminescence of SO2-Oxidation
Authors: Stauff Joachim , Jaeschke Wolfgang
Published: February 2015

The reactions of diluted aqueous solutions of SO2 resp. HSO3-ions with MnO4-or Ce4+ ions in the pH range 1-4 produce chemiluminescence in the spectral region of 450-600 nm. Measurements of the time course of the light emission and their simulation on an analog computer led to a reaction scheme in which a recombination product of primarily formed HSO3 radicals -of a lifetime of about 1 second -appears as precursor of electronically excited SO2 molecules. The participation of singlet oxygen can be excluded because at least the reaction with Ce4+ ions proceeds also in the absence of oxygen.
Cyclische Oxyphosphorane mit dem Spinlabel 4-Oxy-1-oxyl-2.2.6.6-tetramethylpiperidin / Spin-Labeled Cyclic Oxyphosphoranes 4-Oxy-1-oxyl-2,2,6,6-tetramethylpiperidine
Authors: Storzer Werner , Röschenthaler Gerd-Volker
Published: February 2015

Several spin-labeled oxyphosphoranes have been prepared by oxydative addition of biacetyl and hexafluoroacetone to phosphites containing the 4-oxy-1-oxyl-2,2,6,6-tetra-methylpiperidine group. The new compounds have been characterised by ESR and 31P NMR spectroscopy as well as by mass spectra.
The Dimeric Phosphinimine Complex [CdI2(HN: PPh3)2]2 Containing N-H···I Hydrogen Bonds
Authors: Abel Edward W. , Mucklejohn Stuart A. , Cameron T. Stanley , Cordes Ruth E.
Published: February 2015

Triphenylphosphinimine and cadmium iodide form a complex containing the dimeric molecule [CdI2HN:PPh3]2. These dimers are centrosymmetric, with an eight membered ring containing the hydrogen bonded system N-H···I.
New Alkaloids from Prosopis juliflora DC
Authors: Ahmad Viqar Uddin , Basha Anwer , Haque Wasimul
Published: February 2015

Prosopis juliflora, Piperidine Alkaloids The isolation of three new alkaloids from Prosopis julifiora is reported. A structure for the minor alkaloid julifloridine is suggested.
Zur Synthese seitenkettenhydroxylierter Tetrahydrocannabinol / Synthesis of Side Chain Hydroxylated Tetrahydrocannabinols
Authors: Lötz Friedhelm , Kraatz Udo , Körte Friedhelm
Published: February 2015

The potential ⊿8 -tetrahydrocannabinol meta-bolites (6a, b) were synthesized starting from (+)-trans-p-menthadien-(2,8)ol(1) (2) and the resorcyl-alkyl esters (3a, b).
AB2X2-Verbindungen im CaAl2Si2-Typ, IV [1] Zur Struktur der Verbindungen CaZn2Sb2, CaCd2Sb2, SrZn2Sb2 und SrCd2Sb2 / AB2X2 Compounds with the CaAl2Si2 Structure, IV [1J The Crystal Structure of CaZn2Sb2, CaCd2Sb2, SrZn2Sb2, and SrCd2Sb2
Authors: Mewis Albrecht
Published: February 2015

The four ternary compounds CaZn2Sb2, CaCd2Sb2, SrZn2Sb2, and SrCd2Sb2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl2Si2-type structure (space group P3̅m 1-D3
3d) with the following constants:

CaZn2Sb2 a = 4.441 ± 0.001 Å, c = 7.464 ± 0.002 Å;

CaCd2Sb2 a = 4.649 ± 0.001 Å, c = 7.597 ± 0.002 Å;

SrZn2Sb2 a = 4.500 ± 0.001 Å, c = 7,716 ± 0.002 Å;

SrCd2Sb2 a = 4.709 ± 0.001 Å, c = 7.822 ± 0.003 Å.
Organoborierung von Alkinylstannanen, VI [1] Allenbildung bei einer Deorganoborierung / Organoboration of Alkynylstannanes, VI [1] Formation of an Allene by Deorganoboration
Authors: Wrackmeyer Bernd
Published: February 2015

The thermal decomposition of some 1,1-bis(trimethylstannyl)-2-dialkylborylalkenes leads unexpectedly to substituted allenes. The structural information is based on 1H, 11B, 13C and 119Sn NMR data and also on the strong IR band at 1882 cm-1.
Reaktionen von Phosphoryliden mit Übergangsmetall-Verbindungen, V [1] / 1-Diphenylphosphinyl-AlkyMentriphenylphosphoran-carbonyl-chrom- und -eisen-Komplexe / Reactions of Phosphorus Ylides with Transition Metal Compounds, V [1] 1-Diphenylphosphinyl Alkylidenetriphenylphosphorane Carbonyl Chrom and Iron Complexes
Authors: Knoll Lothar
Published: February 2015

The synthesis of new ylide complexes is reported. They are synthesized by the reaction of (CO)5CrP(C6H5)2Cl and (CO)4FeP(C6H5)2Cl with phosphorus ylides (C6H5)3P = CHR (R = CH3, H) and characterized by their IR, 1H NMR and 31P NMR spectra.
1.3-Diondioxime und ihre Metall(II)-Komplexe mit den Ionen Nickel(II), Palladium(II) und Platin(II) / 1,3-Dionedioximes and their Metal(II) Complexes with Ions Niekel(II), Palladium(II) and Platinum(II)
Authors: Gottstein N. , Keller H. J.
Published: February 2015

Several alkyl and aryl substituted 1,3-dionedioximes, like acetylacetonedioxime, have been reacted with nickel(II), palladium(II) and platinum(II) in aqueous or alcoholic solution. Two kinds of complexes were obtained:

(i) those with stoichiometry metal: ligand = 1 : 1 and

(ii) bis(l,3-dionedioximato)metal(II) complexes.

None of the isolated solid compounds showed any sign of appreciable intermolecular metal metal interactions. An attempt to enhance intermolecular interaction by oxidizing the compounds with iodine lead to the destruction of all of the complexes.
Synthesis and Some Reactions of Naphthoylacetanilides
Authors: Ali M. I. , El-Morsy M. M. S. , Hassan N. M. , Sharaf M.
Published: February 2015

The structure of some naphthoylacetanilides (1) obtained from a new route of synthesis is elucidated via inspection of IR, NMR, and mass spectral data. Napthoylacetanilides condensed with one or two moles of aromatic aldehyde to give 2-(naphthoyl)-cinnamanili-des (2) or 3-aryl-2,2′-dinaphthoyl-glutaric acid dianilides (3). Compound 2b added phenylmercaptan to give 3-phenyl 3-phenylthio-2-naphthoyl-propananilide (4). Reduction of 2b gave 2-benzyl 2-(2-naphthoyl)acetanilide (5). 1 is coupled with aryldiazonium salt to give 2-oxo naphthoylacetanilides-2-arylhydrazones (6). The mechanism of the reactions is discussed.
Betaine als Zwischenprodukte der Umlagerung eines Spiro-oxirans in ein Dioxolen / Betaines as Intermediates in the Rearrangement of a Spiro-oxiran into a Dioxolen
Authors: Wittmann Helga , Siegel Hannes
Published: February 2015

Aliphatic, cycloaliphatic and heteroaromatic tert. Amines react with 2,4-dioxo-1-phenyl-1,2,3,4-tetrahydroquinoline-3-spiro-2′-oxiran (1) at 20 °C to give the betaines 2a−g, of which 2a−c are thermically rearranged to 3,4-methylendioxy-1-phenyl-1,2- dihydro-2-quinolone (3). The thermolysis of 2g yields 3-(4-dimethylamino-pyridinio)-2-oxo-1-phenyl-1,2-dihydroquinoline-4-olat (4).
Nachbargruppeneffekte bei der Aminolyse von Estern, II Die Aminolyse von 2-(2-Hydroxybenzyl)phenylacetaten / Neighboring Group Effects in the Aminolysis of Esters, II The Aminolysis of 2-(2-Hydroxybenzyl)phenylacetates
Authors: Böhmer Volker , Wörsdörfer Klaus
Published: February 2015

The aminolysis of 2-(2-hydroxybenzyl)phenyl acetates with n-butylamine in dioxane is much faster than for the corresponding 2-(2-methoxybenzyl)phenyl acetates or 2-methyl-phenyl acetates. The kinetic results can be explained by two equivalent mechanisms. Both of them include the formation of a 1:1-complex between 2-(2-hydroxybenzyl)phenyl acetate and n-butylamine which is formed in an equilibrium. The reaction of this complex according to a second order rate law seems to be more probable than the reaction of the free ester according to a third order rate law.
Wolfram-Carbonylkomplexe mit Stickstoff-Wasserstoff-Liganden [1] / Tungsten Carbonyl Complexes with Nitrogen Hydride Ligands [1]
Authors: Sellmann Dieter , Brandl Alfred , Endeil Ralf
Published: February 2015

Synthesis, properties and reactions of [(OC)5W]2N2H2, [(OC)5W]2N2H4, (OC)5WN2H4, (OC)5WNH3, [(OC)4PØ3W]2N2H4, [(OC)4PØ3WN2H4], [(OC)5W-N2H2-W(CO)4PØ3], [(OC)5W-N2H2-W(CO)4P(CH3)3] and [(OC)5WNHCH3NHC6H5] are reported. The hydrazine complexes are synthesized by ligand exchange from the corresponding tetra-hydrofuran complexes. Oxidation by various oxidizing agents yields the diazene complexes, in most cases very low yields. Substitution of CO by phosphanes leads to reduced stability of the compounds. All complexes undergo base catalysed H-D exchange yielding the corresponding ND derivatives; the diazene complexes show a much faster exchange than the corresponding hydrazine and ammonia complexes, which is explained by the higher acidity of the N2H2 protons. The diazene complexes disproportionate under base catalysis to hydrazine and dinitrogen compounds, the latter of which loose the N2 ligand immediately. The diazene ligand of [(OC)5W]2N2H2 cannot be alkylated by reactions with (CH3)2SO4, LiCH3 or CH2N2; instead, LiCH3 as well as CH2N2 cause disproportionation to N2H4 and N2 complexes. UV irradiation of [(OC)5W]2N2H2 in THF leads to substitution of CO by THF. The THF complexes can be converted to the phosphane substituted diazene complexes. The IR, UV-VIS and 1H NMR spectra of the (OC)5W complexes are nearly identical to those of the analogous Cr and Mo compounds. The unsymmetrical phosphane diazene complexes, however, show a quartet of the N2H2 protons in the 1H NMR spectra with coupling constants of 25-26 Hz for the protons on the NN double bond. This value points to a trans configuration of the diazene ligand and its complexes respectively.
Benzo-benzothiopyranoquinoline Derivatives of Possible Antiparasitic Activity
Authors: Zayed A. , Metri J.
Published: February 2015

For possible antiparasitic activity, benzo-benzothiopyranoquinoline-6-malonaldehyde was synthesized and condensed with hydrazine hydrate, Phenylhydrazine and/or 0-phenylenediamine. This afforded pyrazole, phenylpyrazole and diazepin derivatives respectively.
Structural Effects on Nitrile Infrared Integrated Intensities of Alpha,Beta-Diaryl Cyanoethylenes: Hammett and Quantum Chemical Approaches
Authors: Juchnovski Ivan , Kuzmanova Rositza , Tsenov Jordan , Kaneti José , Binev Ivan
Published: February 2015

The nitrile infrared intensities of a series of a,β-diaryl cyanoethylenes were juxtaposed to the associated substituent constants, HMO and SCF-MO indices and fair to excellent correlations were established. The competitive resonance of the nitrile group with alpha-and beta-aryl substituents is discussed. HMO calculations were used to estimate the steric hindrance to conjugation caused by polycyclic substituents and SCF-MO calculations were made to obtain uniform predictions of nitrile intensities and frequencies for hetero-cyclic derivatives of acrylonitrile.
Über Cyanatomercurate M2Hg3(NCO)8 (M = K, Rb, Cs) - Synthesen, Kristallstrukturen und Schwingungsspektren / On Cyanatomercurates M2Hg3(NCO)8 (M = K, Rb, Cs) - Syntheses, Crystal Structures and Vibrational Spectra
Authors: Thiele Gerhard , Hilfrich Peter
Published: February 2015

By mixing aqueous solutions of Hg(CH3COO)2 and MOCN (M = K, Rb, Cs) the tri-clinic compounds M2Hg3(NCO)8 are formed. In a first approximation the crystal structure analysis indicates isolated Hg(NCO)2 molecules besides K+ and NCO- ions. As in the range of van der Waals radii additional NCO-neighbours are noticed the mercury atoms are surrounded by distorted octahedra. The octahedra around 2/3 of the Hg form infinite chains as in KHg(NCO)3 which are linked together by additional Hg(NCO)2 molecules. Therefore the compound can be formulated as a double salt 2 KHg(NCO)3 • Hg(NCO)2. The vibrational spectrum is discussed. Rb2Hg3(NCO)8 is isotypous while the caesium salt has a double cell volume.
Semiempirische SCF-Rechnungen an den angeregten Zuständen von Hydroxy Cumarinen / Semiempirical SCF-Calculations of the Excited States of Hydroxycoumarines
Authors: Fabian Walter
Published: February 2015

Semiempirical SCF-calculations show that the fluorescence bands of 7-hydroxycoumarin at 1.87 · 104-1,92 · 104 cm-1 are most probably due to a phototautomeric form. A topological rule is evaluated to explain the dependence of the fluorescence intensity upon the position of the hydroxyl group in the various isomeric hydroxycoumarines
Die gas-chromatographische Untersuchung der bei der UV-Bestrahlung von Uracil und Thymin in Lösung und in der Eismatrix gebildeten Produkte / Gas-chromatographic Investigation of Products Formed by UV Irradiation of Uracil and Thymine in Solution and Ice Matrix
Authors: Fahr Egon , Roth Georg Ph. , Wüstenfeld Peter
Published: February 2015

By gas-chromatographic analysis of products prepared by UV irradiation of uracil in water, acetonitrile or ice matrix resp. of thymine in actonitrile could be demonstrated, that in all cases all four cyclobutane dimers are formed
Die Struktur des 2.3.4.6.7.8-Hexamethyl-2.3.4.6.7.8-hexaphosphabicyclo- [3.3.0] octans (PMe)6C2H2 / The Structure of 2,3,4,6,7,8-Hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo[3,3,0]octane (PMe)6C2H2
Authors: Schnering Hans-Georg von , May Wolfgang
Published: February 2015

One of the diastereomeres of 2,3,4,6,7,8-hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo-[3,3,0]octane (PMe)6C2H2 crystallizes in the space group P21/n with four molecules per unit cell. Two independent molecules are nearly identical in shape but differ by inter-molecular packing. The five-membered rings have a skew chair conformation with all exocyclic methyl groups in axial positions leading to a staggered all-trans conformation of the bicyclic system. The mean bond lengths are P-P = 220.9 pm, P-C = 185.9 pm and C-C = 151.9 pm.
Zur Kristallstruktur von Sr6(CrO4)3Cl / On the Crystal Structure of Sr5(CrO4)3Cl
Authors: Müller-Buschbaum Hk. , Sander K.
Published: February 2015

Single crystal X-ray investigation shows that Sr5(CrO4)3Cl is not isotypic with the apatite structure as being affirmed up to now. Chlorine occupies a position other than z = 0.250 implying the lower symmetry C6
6-P 63.

As a consequence one strontium coordination sphere changes from octahedral to trigonal prismatic.