bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spektropolarimetrie. II. Empfindlichkeit von photoelektrischen Polarimetern
Authors: Bürer Th. , Günthard Hs. H. 
Published: December 2004

AbstractSome general considerations are made about the sensitivity of photoelectric polarimeters, characterized by half‐shade arrangements with optical null servo system using a photomultiplier as a detector. Especially for spectropolarimetry the necessity of highly sensitive instruments is shown by a calculation of optimum concentration for measurements of absorbing optically active compounds.
Etude des composés d'addition des acides de LEWIS. XI. Spectre d'absorption infrarouge du composé d'addition CH3COCH3, TiCl4
Authors: Cassimatis D. , Susz B. P. 
Published: December 2004

AbstractThe solid addition compound (CH3)2CO, TiCl4 has been synthesized. The study of its vibrational infrared spectrum shows a characteristic lowering of the frequency ω = v(CO) in regard to that of acetone, viz. 87 cm−1. There exists, therefore, a dative bond between the oxygen and titanium atoms.
Antimetaboliten II Über die Herstellung und Eigenschaften einiger Analoga der Mevalonsäure
Authors: Daeniker H. U. , Druey J. 
Published: December 2004

AbstractDie Synthese von β‐Hydroxy‐β‐methyl‐δ‐mercapto‐valeriansäure und analogen Verbindungen wird beschrieben.
Benzimidazol‐Derivate und verwandte Heterocyclen. IV. Die Kondensation von o‐Phenylendiamin mit α‐Aryl‐ und γ‐Aryl‐acetessigester
Authors: Rossi A. , Hunger A. , Kebrle J. , Hoffmann K. 
Published: December 2004

AbstractThe reaction of o‐phenylenediamine with α‐phenyl‐ and γ‐phenyl‐acetoacetic ester has been investigated. The former yields mainly 1‐β‐methylstyryl‐benzimidazole‐2‐one (IX), the latter affords 4,7‐dihydro‐5‐benzyl‐1H‐2,3‐benzo‐1,4‐diazepin‐7‐one (XVI). The structures of these products have been elucidated.
Isolierung von Bradykinin aus Rinderplasma nach Einwirkung von Schlangengift (Bothrops jararaca). Vorläufige Mitteilung
Authors: Zuber H. , Jaques R. 
Published: December 2004

AbstractBradykinin, resulting from the action of snake venom (Bothrops jararaca) on bovine plasma, has been isolated in an essentially pure form. It contains the five amino acids arginine, phenylalanine, proline, glycine and serine in the ratio of 2:2:2:1:1, corresponding to the amino acid composition found for bradykinin stemming from the action of trypsin on corresponding plasma proteins. Degradation studies give the following partial sequence: H·Arg‐(Pro2 Gly, Ser, Phe)‐Phe‐Arg·OH.
Recherches sur la formation et la transformation de dérivés organiques du fluor III. Préparation d'hydroxy‐acides, d'hydroxy‐nitriles, d'hydroxy‐esters et d'hydroxy‐éthers fluorés ainsi que de leurs dérivé phosphorylés
Authors: Cherbuliez Emile , de Picciotto A. , Rabinowitz J. 
Published: December 2004

AbstractSome new fluorinated hydroxy‐acids and hydroxy‐ethers as well as their phosphorylated derivatives are described.
Synthese vom 1‐Keto‐A‐nor‐cholestan. Beitrag zur Kenntnis der FAWORSKI‐Reaktion
Authors: Sigg H. P. , Tamm Ch. 
Published: December 2004

AbstractCholestanon‐(1) (V) lieferte bei der Bromierung 2α‐Bromcholestanon‐(1) (IX) (Hauptprodukt) sowie 2β‐Bromcholestanon‐(1) (VI) und 2,2‐Dibromcholestanon‐ (1) (VII). Bei der Behandlung von IX mit Alkoholat‐Ionen wurde keine Ring‐ kontraktion nach FAWORSKI, sondern Substitution von Br durch OH unter Bildung von 2α‐ und‐ 2β‐Hydroxycholestanon‐(1)(XI bzw. VIII) sowie Oxydation zur 1,2‐Secosäure XIII beobachtet.
Syntheseversuche in der Griseofulvin‐Reihe. Vorläufige Mitteilung. Totalsynthese von Griseofulvin
Authors: Brossi A. , Baumann M. , Gerecke M. , Kyburz E. 
Published: December 2004

AbstractA total synthesis of the antibiotic griseofulvin is described. Starting from phloroglucinol, rac. epi‐griseofulvin could be synthesized. The latter was isomerized to rac. griseofulvin and hydrolysed to rac. griseofulvic acid by way of rac. iso‐grisrofulvin. Resolution of rac. griseofulvic acid was achieved by means of brucine.
Isolierung von Arenobufagin und einiger weiterer unbekannter Bufogenine aus Ch'an su. Über Krötengifte, 22. Mitteilung
Authors: Hofer Peter , Meyer Kuno 
Published: December 2004

AbstractDie hier beschriebene erneute Untersuchung der chloroformlöslichen Bestandteile der chinesischen Krötengiftdroge Ch'an Su hat durch Kombination der Adsorptionschromatographie an Al2O3 mit der präparativen Papierchromatographie die Isolierung von 14 papierchromatographisch einheitlichen Bufogeninen ermöglicht, wovon 13 sich in Kristallen gewinnen liessen. 4 davon konnten zum ersten Mal in Ch'an Su nachgewiesen werden. Bei diesen neuen Bufogeninen handelt es sich um Arenobufagin und dessen Artefact Bufarenogin, die schon in anderen Krötengiftsekreten nachgewiesen worden sind, und um zwei vermutlich völlig neue Bufogenine – vorläufig mit den Buchstaben G und H bezeichnet –, die zu Unterschied vom Arenobufagin, das ein 14‐Hydroxysteroid ist, auf Grund des IR.‐Spektrums 14,15‐Epoxysteroide sein dürften. Das früher im Ch'an Su nachgewiesene Desacetylbufotalin konnte hier nicht wieder aufgefunden werden.
Über Dipyridyl‐ähnliche Thiazolyl‐oxazole
Authors: Rinderspacher Th. , Prijs B. 
Published: December 2004

AbstractA series of thiazolyl‐oxazoles, most of them having the structural feature NCCN of 2,2′‐bipyridyl known to form metal chelates, has been synthesized by condensation of α‐halogen carbonyl compounds with thioamides of oxazole‐carboxylic acids. The latter were obtained by the method of CORNFORTH and by preparing successively their esters, amides, and nitriles.
Oxydation von o‐Dianisidin durch Röntgen‐Strahlen bzw. H2O2 in Gegenwart von Peroxydase und anderen Haeminverbindungen
Authors: Aebi H. , Temperli A. , Gressly R. , Oestreicher R. , Zuppinger A. 
Published: December 2004

Abstract
Horseradish‐peroxidase with o‐dianisidine in buffered solution has been used for X‐ray dosimetry and for the detection of small amounts of H2O2.
Zur Chemie des 5,10‐Dihydro‐phenophosphazins (5‐Aza‐10‐phospha‐5,10‐dihydro‐anthracen)
Authors: Häring Marc 
Published: December 2004

AbstractEine verbesserte Darstellung, sowie eine Anzahl von Umsetzungen des 10‐Hydroxy‐5,10‐dihydro‐phenophosphazins (II, 5‐Aza‐10‐phospha‐5,10‐dihydro‐anthracens) werden beschrieben; fü die erhaltenen Reaktionsprodukte werden Strukturen vorgeschlagen, die meist durch deren IR.‐Spektren gestützt werden.
Synthese geschützter Depsipeptide
Authors: Schwyzer R. , Carrión J. P. 
Published: December 2004

AbstractThe syntheses and properties of p‐nitrobenzyl diazoacetyl‐glycinate (VI), p‐nitrobenzyl p‐(p‐methoxyphenylazo)‐benzyloxycarbonyl‐glycyl‐glycollyl‐glycinate (II) and p‐nitrobenzyl p‐phenylazo‐benzyloxycarbonyl‐glycyl‐glycollyl‐glycinate are described. These compounds have been prepared as intermediates for the synthesis of other depsipeptides.
Über ein neues Magnesiumarsenid: MgAs4
Authors: Pigon K. 
Published: December 2004

AbstractDas neue Magnesiumarsenid MgAs4, das direkt aus den Elementen hergestellt wurde, ist ein schwarzgraues Pulver, das bei höheren Temperaturen unter Arsenabgabe in das gewöhnliche Arsenid Mg3As2 übergeht und bei 792° ± 5° C (unter 5 Atü Arsendampfdruck) schmilzt. Es ist gegen konzentrierte Salzsäure beständig (was eine einfache Trennung vom mitgebildeten Mg3As2 ermöglicht) und wird erst von konzentrierter Salpetersäure angegriffen.
Ergebnisse der Tieftemperaturforschung XXXIII. Die Dampfdruckdifferenz von 16O2 und 18O2 zwischen 63° und 90°K
Authors: Clusius K. , Endtinger F. , Schleich K. 
Published: December 2004

AbstractDie Dampfdrucke von gewöhnlichem Sauerstoff und einem schweren Sauerstoff mit 0,21% l6O, 0,15% l7O und 99,64% IS0 wurden zwischen 63°K und dem Siedepunkt miteinander verglichen. Umgerechnet auf reine Isotope wird das Dampfdruckverhältnis durch die Beziehung magnified image dargestellt. Der Siedepunkt des 18O2, liegt 0,105° höher als der des 16O2 (90,19,° K); der Dampfdruckunterschied der beiden Isotope betragt bei dieser Temperatur 8,26 mm Hg. Der Unterschied der Verdampfungswärmen macht 6,28 cal/Mol aus, wobei dem schweren Sauerstoff die höhere Verdampfungswärme zukommt. Aus der Temperaturabhängigkeit der Differenz der Verdampfungswärme folgt, dass die Molwärme des flüssigen 18O2 bei 90°K um 0,06, cal/Mol°, bei 65°K um 0,12 cal/Mol° grosser als die des 16O2 ist.
Untersuchung der Bindung von Natrium‐ und Chlorid‐Ionen durch Casein mittels RÖNTGEN‐Strahlen‐ und Elektronen‐Beugung
Authors: Gál S. , Ludi A. , Oswald H. R. , Signer R. 
Published: December 2004

AbstractInvestigations by X‐ray and electron diffraction show that sodium chloride will be bound by casein, if the salt is added in aqueous solution to the protein and if the water is then removed under isothermal and nearly reversible conditions. This confirms earlier results obtained by water sorption measurements. The diffraction method is a simple and safe way for determining the maximum salt binding capacity of the protein. 90 to 95 models of NaCl are bound by 105 g of casein, which is more than 80% of the amount calculated from the amino‐acid composition of the protein.
Die Struktur von Pleiocarpin, Pleiocarpinin und Kopsinin. (Vorläufige Mitteilung)
Authors: Kump W. G. , Le Count D. J. , Battersby A. R. , Schmid H. 
Published: December 2004

AbstractChemical and spectroscopic evidence has led to the derivation of formulas VII, VIII (R=CH3, R'=COOCH3) and VIII (R=H, R'=COOCH3) for pleiocarpine, pleiocarpinine and kopsinine, respectively.
Zur Frage isomerer 1:2‐Chromkomplexe der o,o'‐Dihydroxyazo‐Reihe
Authors: Schetty G. 
Published: December 2004

AbstractIt is shown that, in contrast to the 0‐carboxy‐0′‐hydroxy‐azo‐ and ‐azomethine dyestuffs, the 0,0′‐dihydroxy‐azo dyestuffs form exclusively, or at least mainly, sterically homogeneous 1:2‐chromium complexes.
Bromierung von 2‐Naphtol‐6,8‐disulfosäure: III. Untersuchungen über die Struktur des Zwischenproduktes und die Stereochemie der elektrophilen Substitution
Authors: Christen M. , Koch W. , Simon W. , Zollinger Hch. 
Published: December 2004

Abstract
The structure of the intermediate appearing in brominations of 2‐naphthol‐6, 8‐disulphonic acid with Br2 and HOBr has been investigated.
Zur Chemie des WIELAND‐GUMLICH‐Aldehyds. 55. Mitteilung über Curar‐Alkaloide
Authors: Deyrup J. A. , Schmid H. , Karrer P. 
Published: December 2004

AbstractA synthesis of diaboline (N(a)‐acetyl‐Wieland‐Gumlich aldehyde) is described. Rotational and spectral arguments are employed in a discussion of the configuration of the C‐17 center of the Wieland‐Gumlich aldehyde and some of its derivatives. These results are explained in terms of a conformational analysis of these compounds.
Steroide und Sexualhormone 226. Mitteilung. 10α‐Testosteron und 1‐Dehydro‐10α‐testosteron
Authors: Wenger R. , Dutler H. , Wehrli H. , Schaffner K. , Jeger O. 
Published: December 2004

Abstract10α‐Testosterone and its 1‐dehydro derivative have been synthesised in 7 and 8 steps, respectively, from O‐acetyl‐1‐dehydro‐testosterone. The key step, which is described in a preceding paper, was the selective inversion of configuration at C‐10 of the starting material, effected through a photochemical reaction.
Die Fragmentierung von α‐Aminoketoximen. BECKMANN‐Reaktionen zweiter Art. I. Teil. Fragmentierungs‐Reaktionen. 4. Mitteilung
Authors: Fischer H. P. , Grob C. A. , Renk E. 
Published: December 2004

Abstractsyn and anti forms of α‐amino‐acetophenone oximes R2NCH2(C6H5)CN‐X undergo fragmentation to a carbimonium salt (R2NCH2)⊕ X⊖ and benzonitrile upon conversion into esters (e. g. tosylate, benzoate, p‐nitro benzoate) or ethers (e. g. 2,4‐dinitrophenyl or picryl ether).
Die Raschneutralisation von Wolframaten und Wolframatophosphaten in der Strömungsapparatur
Authors: Schwarzenbach G. , Geier G. , Littler J. 
Published: December 2004

AbstractWith a rapid flow apparatus the investigation of the simple protonation of WO42− was achieved (pK1 + pK2 = 8,1, both H+ being added almost simultaneously). The rapid condensation which follows the protonation leeds during the first decisecond to a product of Z = 1.25, probably H5W4O163−. A few minutes later, a new preequilibrium is established with (according to Sasaki) HW6O215− (Z = 1.167) as practically the only polynuclear product present. The final equilibrium is reached only very slowly.
Steroide und Sexualhormone 228. Mitteilung. Zu Solvolyseversuchen mit Δ4‐ und Δ5‐ungesättigten 19‐Mesyloxy‐Steroiden. (Vorläufige Mitteilung)
Authors: Bonet J. J. , Wehrli H. , Schaffner K. 
Published: December 2004

AbstractSolvolysis of 3,17‐Dioxo‐19‐mesyloxy‐Δ4‐androstene (2) in methanolic sodium methylate solution yields a mixture of the 6β, 19‐cyclo‐androstane derivatives 3 and 4. 3,17‐Diethylenedioxy‐19‐mesyloxy‐Δ5‐androstene (11) in boiling pyridine is converted into 3,17‐diethylenedioxy‐5β, 19‐cyclo‐Δ6‐androstene (12).
Über Steroide und Sexualhormone 227. Mitteilung. Die Fragmentierung einwertiger Alkohole mit Blei(IV)‐acetat
Authors: Amorosa M. , Caglioti L. , Cainelli G. , Immer H. , Keller J. , Wehrli H. , Mihailović M. Lj. , Schaffner K. , Arigoni D. , Jeger O. 
Published: December 2004

AbstractResults previously reported on the fragmentation of monohydric alcohols with lead tetraacetate are extended and correlated on the basis of new experimental evidence.
Die Glykoside der Blätter von Digitalis canariensis L. 1. Mitteilung
Authors: Studer P. , Pavanaram S. K. , Gavilanes C. R. , Linde Horst , Meyer Kuno 
Published: December 2004

AbstractEinem aus getrockneten Blättern von Digitalis canariensis L. bereiteten wässerigen Extrakt liessen sich die Glykoside praktisch vollständig durch Ausschütteln mit Chloroform‐Alkohol‐(4:1) entziehen. Da keine Kristalle aus dem so erhaltenen Glykosidgemisch gewonnen werden konnten, wurde dieses dem partiellen Abbau mit Strophanthobiase zur Monosidstufe unterworfen, wobei 2/5 unverändert blieben. Das Gemisch der Monoside bestand zu etwa 15% aus freien Geninen.
11α, 19, 21‐Triacetoxy‐14‐hydroxy‐Δ1,4‐14β‐pregnadiendion‐(3,20) aus 1α, 11α‐Oxido‐strophanthidol (Monoanhydro‐ouabagenin)
Authors: Tamm Ch. , Zürcher W. 
Published: December 2004

AbstractThe synthesis of llα, 19, 21‐triacetoxy‐14‐liydroxy‐Δ1,4‐14β‐pregnadien‐3, 20‐ dione is described using lα, llα‐oxido‐strophanthidol (monoanhydro‐ouabagenin) as starting material.
Photochemische Reaktionen. 18. Mitteilung. Die Konstitution der Photosantoninsäure
Authors: Schott E. , Arigoni D. , Jeger O. 
Published: December 2004

AbstractOn the basis of degradative work and spectroscopic evidence structure 3 has been derived for photosantoninic acid, a dimeric compound previously obtained by the action of UV.‐light on alcaline solutions of santonin (1). The stereochemistry of the compound and the mechanism of its formation from lumisantonin (2), a known photoisomer of 1, in an alkali‐catalyzed process are briefly discussed.
Konfiguration der raumisomeren 3β‐Acetoxy‐8,14‐epoxyätiansäure‐methylester und verwandter Stoffe. Gallensäuren und verwandte Stoffe, 58. Mitteilung
Authors: Lardon A. , Reichstein T. 
Published: December 2004

AbstractBei der Eliminierung der 14‐ständigen HO‐Gruppe in 3β‐Acetoxy‐l4β‐hydroxy‐5β‐atiansaure‐methylester mit Ameisensäure bei 20° (Methode von FRÈREJACQUE) bilden sich nur die zwei Isomeren IV (Δ14) und V (Δ8:14), wobei IV überwiegt. Bei 80° (15 Min.) entsteht mehr V, und daneben ein drittes, bisher amorphes Isomeres, vermutlich VI (Δ8). Bei längerer Einwirkung (3 Std.) ist VI das einzig fassbare Reaktionsprodukt.
Isolierung und Charakterisierung zweier neuer Blattfarbstoffe: Coleon A und Coleon B. Chinontrennungen an Polyamidpulver
Authors: Eugster C. H. , Küng H.‐P. , Kühnis H. , Karrer P. 
Published: December 2004

AbstractAus der in Afrika vorkommenden Labiate Coleus igniarius (SCHWEINF.) wurden zwei neue Blattfarbstoffe isoliert, welche die Bezeichnung Coleon A (C20H22O6) und Coleon B (C12H20O6) erhielten.
Über die Isolierung neuer Stoffwechselprodukte aus Penicillium brefeldianum DODGE
Authors: Härri E. , Loeffler W. , Sigg H. P. , Stähelin H. , Tamm Ch. 
Published: December 2004

AbstractTwo new mold metabolites, Brefeldin A (C16H24O4) and Brefeldin B (C15H2205), have been isolated from the fermentation broth of a strain of Pefiicillium brefeldiawm DODGE. Their chemical, physical and biological properties have been described.
Une transposition de caractère particulier dans la série des dioxindoles α‐substitués
Authors: Giovannini E. , Rosales J. 
Published: December 2004

AbstractThe diester of N‐methyl‐N‐(o‐carboxyphenylj‐alanine (I b)) gives by DIECKMANN reaction 1,3‐dimethyl‐3‐hydroxy‐oxindole (VIII), which is probably the product of a rearrangement of 1,2‐dimethyl‐2‐hydroxy‐oxindole (V), this latter being the product of autoxydation of the primary formed 1,2‐dimethyl‐indoxyle. VIII seems not to be in equilibrium with V.
Der Einfluss der Alkali‐Ionen auf die Saccharase‐Aktivität der menschlichen Darmschleimhaut. Vorläufige Mitteilung
Authors: Semenza G. , Tosi R. , Delachaux M. C. 
Published: December 2004

AbstractThe invertase activity of human intestinal mucosa is activated by Na+ and, to a smaller extent, by K+. It is inhibited by Rb+, Cs+ and NH. Similar results have been obtained with isomaltase and maltase activities. The activation and the inhibition constants respectively of these cations on invertase activity have been determined.
Anorganische Dünnschicht‐Chromatographie. 7. Mitteilung. Quantitative Bestimmung dünnschicht‐chromatographisch getrennter Kationen
Authors: Seiler H. 
Published: December 2004

AbstractInorganic cations separated by thin‐layer chromatography have been determined without isolation, using area of spots, photometric measurements and radionuclides.
Strahlungschemie der Kohlenwasserstoffe. 8. Mitteilung. Olefine in Hexan
Authors: Widmer Hans , Gäumann Tino 
Published: December 2004

AbstractThe radiation chemistry of solutions of olefins in hexane has been studied as a function of temperature. An activation energy of 5,5 kcal/mole (6,8 kcal/mole) for the addition of alkylradicals to 1‐hexene (1‐octene) is found. The addition of hydrogen atoms to olefins does not show the expected temperature dependence; olefins apparently also reduce the number of radicals formed or available. The reason for this unexpected behaviour is not clear.
Cycloheptatrien‐1, 6‐dicarbonsäure und Bicyclo‐[4, 1, 0]‐2, 4‐heptadien‐1, 6‐dicarbonsäureanhydrid
Authors: Darms R. , Threlfall T. , Pesaro M. , Eschenmoser A. 
Published: December 2004

AbstractThe synthesis and some of the properties of cycloheptatriene‐1,6‐dicarboxylic acid and its norcaradieneoid anhydride are describe.
Die Darstellung von 5,11‐Endomethylen‐tetrahydrophenhomazinen und 5‐Alkyl‐tetrahydrophenhomazinen
Authors: Häring Marc 
Published: December 2004

AbstractThe preparation of some of Tröger's Bases (I), their transformation into the corresponding dibenzo(b‐f)diazocines‐(1,5) (II, phenhomazines) and some of their derivatives are described. The reaction between I and e.g. methylsulphate, yielding II, is shown to proceed through quaternary salts (III) and the intermediates IV. The constitution proposed for the resulting II is supported by the results of hydrogenolytic degradation reactions.
Trennung komplizierter Fettsäuregemische durch Chromatographie an Silbernitrat‐haltigem Silicagel
Authors: Wagner Heribert , Goetschel Jean‐Daniel , Lesch Peter 
Published: December 2004

AbstractColumn chromatography on silicagel impregnated with 10% silver nitrate results in a good resolution of a complex mixture of fatty acid methyl esters. Examples are shown for separation of (a) saturated, unsaturated and monohydroxylated and (b) linolenic and stearolic esters.
Zur Reaktion von Reaktivfarbstoffen mit Cellulose III. Konstitution der Abbauprodukte. 10. Mitteilung über textilchemische Untersuchungen
Authors: Stamm O. A. 
Published: December 2004

AbstractIt is shown that Remazol Brillant Blue R reacts with the glucose unit of cellulose mainly at the C‐2 position. Some reaction also occurs at C‐1 and C‐4 of the reducing and non reducing end groups respectively.
Die Alkaloide von Crinum macrantherum ENGL. 5. Mitteilung über Amaryllidaceen‐Alkaloide
Authors: Hauth H. , Stauffacher D. 
Published: December 2004

AbstractFresh leaf sheaths of Crilzum macrantherum ENGL.contained 0.13 % alkaloids of which 5.5% were phenolic bases. From the non‐phenolic bases eight alkaloids (83% of the total alkaloids) could be obtained and characterized. Four of these proved to be identical with the known alkaloids lycorine (68% of the total alkaloids), crinamine, criwelline, and acetylcaranine, the other four (10% of the total alkaloids) being new: macranthine, its O‐mono‐ and O, O‐diacetyl compounds, and macronine.
Über die Teilchengrössenabhängigkeit der Lichtabsorption in heterogenen Systemen. I. Theoretische Betrachtungen
Authors: Felder B. 
Published: December 2004

AbstractBased on the laws of probability and light scattering being neglected, an equation is derived which describes the light absorption properties of concentrated and diluted monodispersed heterogeneous systems as a function of particle size. Taking into account the volume occupied by a single particle, it is shown that the particle distribution within a concentrated system can be described by a hypergeometric distribution function. The theory is extended to monodispersed systems containing particles of different absorption properties and also to diluted polydispersed systems.
Die vaporometrische (thermoelektrische) Molekulargewichtsbestimmung. Teil IV: Theoretische Behandlung der Messapparatur
Authors: Chylewski Ch. , Simon W. 
Published: December 2004

AbstractThe influence of temperature, drop size, dilution and cell atmosphere on the signal has been calculated for vaporimetric (thermoelectric) molecular weight instruments. The results are supported by experimental data.
Fettsäurehaltige basische Peptide mit antibakterieller Wirkung
Authors: Vogler K. , Lanz P. , Quitt P. , Studer R. O. , Lergier W. , Böhni E. , Fust B. 
Published: December 2004

AbstractThe synthesis of a new class of surface active agents consisting of basic peptides containing on one amino group a large aliphatic acyl residue is outlined. There are some definite relations between constitution and antibacterial properties. The structural conditions for maximum activity are:

The peptide has to consist of strongly basic amino‐acids. Lysine as an inexpensive constituent seems to be the material of choice.
Lengthening of the peptide chain in the oligo series is associated with increasing activity, but lysine dipeptides show optimal properties.
The aliphatic fatty acid residue has to contain preferably 14‐18 carbon atoms, palmitic acid representing the optimum. I t should be attached to the Na‐amino group.
The carboxyl end has to be protected, e. g. by an ester or amide function, in order to avoid a decrease in basicity.
Lower units such as acylated basic amino‐acids exhibit lower activity, especially against GRAM‐negative pathogens.
Réaction de quelques amides substitués de l'acide benzénephosphosphoneux avec les α‐halogénococétones
Authors: Hudson R. F. , Chopard P. A. , Salvasri G. 
Published: December 2004

AbstractBis‐dimethylaminophenylphosphine reacts with α‐halogeno esters and ketones to give hygroscopic quaternary phosphonium salts, leading to ill‐defined betaines which readily undergo the WITTIG reaction with benzaldehyde. In alcohol solution, the reaction with phenacyl chloride gives the corresponding ketone, dialkyl phenyl‐phosphonate and amine hydrochloride. A mixture of trimethylammonium and tetra‐methylammonium chloride has been obtained from methanol, but dimethylammonium chloride only from ethanol. These observations are interpreted by a bimolecular (SN2) de‐alkylation of a trimethoxyphosphonium intermediate in methanol, and a unimolecular (SN1) de‐alkylation of the corresponding triethoxyphosphonium intermediate in ethanol.
Anthropogammamètre (Wohle Body Counter) de Genève. II. Etalonnage pour le potassium naturel et variation de la teneur en potassium naturel en fonction du poids du sujet
Authors: Wenger Pierre , Soucas Kyriacos 
Published: December 2004

AbstractThe whole body counter of Geneva has been calibrated for potassium measurements by using a 42K standard solution and natural potassium.