bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isolation of Infectious DNA from Avian Myeloblastosis Virus Transformed Leukemic Cells
Authors: Ogura Hajime , Friis Robert R. , Bauer Heinz 
Published: August 2018

Abstract
Chick helper factor (chf) negative chick embryo cells were exposed in the presence of DEAE-dextran to chromosomal DNA isolated from avian leukemic myeloblasts which had been induced by infection with the BAI-A strain of avian myeloblastosis virus (AMV) (subgroup B) . After several transfers, avian C-type virus production was observed in the cultures with electron micro­ scopy, although no alteration in the cell morphology was apparent.
Virus interference tests revealed that this virus was infectious and belonged to subgroup B of the avian RNA toumor virus (ATV) group. The virus induced nephroblastomas 2 months after intraperitoneal inoculation of chickens; no myeloblastosis was observed, however, and the virus could neither transform chick embryo cells in vitro nor induce wing web tumors in vivo. The nephroblastomas also produced virus which was again shown to be a member of subgroup B. From these results it was concluded that the virus transmitted in these experiments was avian myeloblastosis associated virus (MAV), an avian leukosis virus known to be present as a major component in AMV stocks.
Endgültige Struktur der Cascaroside A, B, C, D von Rhamnus purshianus D.C. / The structure of the Cascarosides A, B, C, D from Rhamnus purshianus D.C.
Authors: Wagner Hildebert , Demuth Günter 
Published: August 2018

Abstract
The final structure of the Cascarosides A, B, C, D from Rhamnus purshianus D. C. was clearified by chemical and optical methods.
Influence of a Magnetic Field on the UV-sensitivity in Yeast
Authors: Schaarschmidt B. , Lamprecht I. , Müller K. 
Published: August 2018

Abstract
Saccharomyces cells were grown in a 58 000 A/cm magnetic field and then exposed to UV-irradiation. An increase of the survival rate is observed. The application of magnetic field just after UV-exposure shows a decreased survival.
Resistance Changes Associated with the Response of Insect Monopolar Neurons
Authors: Laughlin S. B 
Published: August 2018

Abstract
Intracellular recordings from the dragonfly lamina show that the light initiated hyperpolarising response of large monopolar cells (LMC's) is associated with a resistance decrease. The response reversal potential is at least 40 mV negative to the dark resting potential. The adaptation of the response to a maintained stimulus is associated with a decrease in hyperpolarising input.
Synthese einer Partialsequenz aus dem aktiven Zentrum der Streptokokken-Protease (EC 3.4.22.10), V / Synthesis of a Fragment of the Active Center of the Streptococcal Proteinase, V
Authors: Schaich Eugen , Schneider Friedhelm 
Published: August 2018

Abstract
The synthesis of the protected peptides Boc-Val-Ala-Thr-Ala-Thr-Ala-Gln-Ile-OH and Thr-Ala-Gln-Ile-Met-Lys(Z)-NH2 is described. These sequences are fragments of an active center peptide of the streptococcal proteinase (EC 3.4.22.10)
The Modification of Actomyosin ATPase Activity by Tropomyosin-Troponin and its Dependence on Ionic Strength, ATP-Concentration, and Actin-Myosin Ratio
Authors: Daneker Peter 
Published: August 2018

Abstract
At millimolar concentrations of ATP the ATPase activity of regulated actomyosin (which consisted of myosin and of actin containing the regulatory proteins tropomyosin and troponin) was lower than that of unregulated actomyosin (containing actin devoid of the regulatory proteins) when the ionic strength was high (> 0 .0 3 ᴍ KCl). At low ionic strength (0.03 ᴍ KCl) the ATPase activity of regulated actomyosin was similar to or even higher than that of unregulated acto­ myosin. Besides increasing ionic strength an increasing actin-myosin ratio tended to depress the ATPase activity of regulated actomyosin below that of unregulated one. At lower ATP concen­ trations (0.1 mᴍ or lower) the ATPase activity of regulated actomyosin was higher than that of unregulated actomyosin at any ionic strength and at any actin-myosin ratio. EGTA inhibited the ATPase of regulated actomyosin under any conditions at high ATP concentrations. At lower ATP concentrations EGTA inhibited either at higher ionic strength or at a higher actin-myosin ratio. The inhibition of the ATPase activity of acto-HMM by increasing ionic strength was not in­ fluenced by the regulatory proteins. - For the interpretation of these results it has been assumed that in actomyosin regulated actin can adopt three states: A low-affinity state which activates the ATPase of myosin only slightly (occurring at high ATP concentrations and in the absence of Ca2+), a high affinity state which activates the ATPase of myosin better than does unregulated actin (occurring at low concentrations of ATP and in the presence of Ca2+), and an intermediate state. This latter state (occurring at high concentrations of ATP and in the presence of Ca2+ or at low concentrations of ATP and in the absence of Ca2+) activates the ATPase of myosin less than does unregulated actin when the actin-myosin ratio is high (wide spacing of myosin on the actin filaments) but activates more (or at least not less) when the actin-myosin ratio is low (dense spacing of myosin on the actin filaments)
Flavonoide aus Rhus salicifolia / Flavonoids from Rhus salicifolia
Authors: Wollenweber Eckhard 
Published: August 2018

Abstract
Leaf-extract of Rhus salicifolia is shown to contain, besides myricetin, quercetin and kaempferol, the rare myricetinmethylethers syringetin and europetin and the quercetin-methylethers ombuin and rhamnetin. The structures are proved by spectral analysis (UV, MS, NMR) and by cochromato­ graphy with authentic substances
Metabolisierung von 3.4-Dimethoxybenzaldehyd und 3.4-Dimeth- oxybenzoesäure in der isoliert perfundierten Rattenleber / Metabolism of 3,4-Dimethoxybenzaldehyde and 3,4-Dimethoxybenzoic Acid in Perfused Rat Liver
Authors: Müller-Enoch D. , Thomas H. , Holzmann P. , Haider K. , Harms H. 
Published: August 2018

Abstract
Isolated rat livers were perfused with 3,4-dimethoxybenzaldehyde and 3,4-dimethoxybenzoic acid, which were 14C-labelled in the m eta-and/or para-configurated methoxy group. Because the aldehyde group was completely oxydized to the carboxylic acid, the perfusions with 3,4-dimethoxybenzalde­ hyde and those with 3,4-dimethoxybenzoic acid exhibited principally the same results. After per­ fusion with a 1:1 mixture of (4 -O -[14C]methyl)-and (3 -O -[14C]methyl)-3,4-dimethoxybenzalde­ hyde, each of which had the same specific activity, thin layer chromatography of an extract of the perfusate revealed both radioactive 4-hydroxy-3-methoxybenzoic acid and radioactive 3-hydroxy-4-methoxybenzoic acid as demethylation products. The distribution of radioactivity between these two metabolites was determined as 20:1. Thus, demethylation of the 3,4-dimethoxyphenyl com­pound occurs preferentially at the para-configurated methoxy group. After perfusion with a mixture of (4-O-[14C] methyl) -and (3 -O -[14C] methyl) -3,4-dimethoxybenzoic acid under identical conditions the distribution of radioactivity of the named demethylation products was determined as 15:1.
After perfusion with (4 -O -[14C] methyl) -3,4-dimethoxybenzaldehyde or (4-O -[14C] methyl)-3,4-di-methoxybenzoic acid alone, extracts of the perfusates revealed the expected radioactive 3-hydroxy-4-methoxybenzoic acid. In addition it was found, that the 4-hydroxy-3-methoxybenzoic acid pro­ duced contained small quantities of radioactivity. From these results it may be infered that an interconversion between 3-hydroxy-4-methoxy-and 4-hydroxy-3-methoxybenzoic acid has occured. The identification of the metabolites, separated by thin-layer chromatography, was performed by the reversed isotope dilution technique
Über direktm arkierungen mittels der reaktion 14n (n,p)14c: mikrobielle gewinnung radiochemisch reiner verbindungen aus bestrahlten purin- und benzimidazol-basen / direct labeling by means of 14n (n ,p )14c: microbial production of radiochemical pure compounds with irradiated purine and benzimidazole bases
Authors: Miiller Otto , Alkan Meric , Rapp Ursula 
Published: August 2018

Abstract

14C-labeling by means of neutron irradiation of nitrogen containing heterocyclic compounds such as benzimidazoles and purines has been studied. The isolation of radiochemical pure compounds was realised by a microbiological method using P . sherm anii. This microorganism utilizes benzimida­ zoles and purines for the base moiety of vitamin B12 ana­ logues, which were isolated and degradated. Microbiological methods seem to provide and excellent tool not only for checking specific radioactivity but also for the isolation of radiochemical pure compounds
Eine chromatographische Analysenm ethode für B etalainfarbstoffe in Pilzen und höheren Pflanzen * / Chrom atographie Analysis of Betalaine Pigments in Toadstools and Higher Plants
Authors: Döpp H , Musso H 
Published: August 2018

Abstract
A simple chromatographic procedure for the separation of betalaine pigments is described. The betalaines of Amanita muscaria, A . caesarea and A . flavoconia are compared and the composition of several musca-aurins is given
Further Observations on in vivo Radioprotection of Rats by Selenourea
Authors: Badiello Roberto , Gattavecchia Enrico , Mattii Mario , Tamba Maurizio 
Published: August 2018

Abstract
This paper deals with a study of some tests in rats in vivo after gamma irradiation in the presence and in the ab­ sence of selenourea. The factors considered were the total protein content, the protein pattern, and some serum enzymes, like GOT, GPT and AP. The result shows that the preadministration of selenourea modifies fovourably the changes induced by ionizing radiation
Effect of imipramine on human chromosomes studied by the method of poly-l-lysine binding
Authors: Marfey S. P. , Li M. G. 
Published: August 2018

Abstract
Metaphase chromosomes of group A isolated from the imipramine-treated lymphocyte cultures did bind more tritiated poly-ʟ-lysine (3H-PL) than the control chromosomes. The increase in binding was dependent on the length of treatment and on contraction of chromosomes. The effect of contraction was more pronounced for the treated chromosomes than for controls and was larger when the treatment was done 4 hours before termination of culture. The observed differences in the 3H-PL binding probably reflect differences in the chromosomal surface morphology
Synthese des Phlebiarubrons und der Polyporsäure / The Syntheses of Phlebiarubrone and Polyporic Acid
Authors: Dallacker Franz , Ditgens Klaus 
Published: August 2018

Abstract
The preparation of phlebiarubrone (1) and polyporic acid (13) starting with 1,2-dimethoxy-4.5-methylenedioxybenzene (3) is described.
Shuttles of Artificial Electron Donors for Photosystem I Across the Thylakoid Membrane
Authors: Hauska G. , Oettmeier W. , Reimer S. , Trebst A. 
Published: August 2018

Abstract
NADP+ reduction in isolated chloroplasts of spinach by photosystem I at the expense of various artificial donor systems is not inhibited by the plastoquinone antagonist dibromothymoquinone. The coupled ATP formation in such photoreductions is attributed to an artificial energy conserving site, i. e. a proton liberation during oxidation of the donor at the inner surface of the thylakoid membrane.
Some donor systems for photosystem I are stimulated by uncouplers whereas others are not. The stimulation shows no correlation to the efficiency of the coupled photophosphorylation. Instead a correlation of the stimulation by uncouplers to the presence of an acidic OH-group in the donor molecule is seen. The uncoupler effect is therefore not explained by a release of electron transport control by the high energy state but rather by a pH-dependent distribution of the donor compound across the membrane. This is supported by the properties of donor systems in sonicated chloroplast particles with external oxidation sites of photosystem I.
Phytochromsystem und Lipochinonsynthese in den Plastiden etiolierter Hordeum-Keimlinge Phytochrome System and Synthesis of Lipoquinones in the Plastids of Etiolated Hordeum Seedlings
Authors: Lichtenthaler Hartmut K. , Kleudgen Hans K. 
Published: August 2018

Abstract
Short pulses of red light induce in etiolated barley seedlings an enhanced synthesis of plastidic benzoquinones and vitamin K1 , which can be reverted by subsequent irradiation with short pulses of far-red. As compared to the dark there is more formation of plastoquinone-9 than α-tocopherol. The enhanced formation of vitamin K1 is coupled with a concomitant decrease in the level of the second naphthoquinone vitamin “K”. The data show that active phytochrome Pfr , also in its ground state, induces the light triggered lipoquinone synthesis which is connected to thylakoid formation. The red light induction of enhanced plastoquinone-9 synthesis cannot be fully reverted by subsequent far-red and seems to be a very fast phytochrome response.
Interactions Between Black Lipid Membranes and the Loosely Bound Proteins from Erythrocyte Membranes
Authors: Brennecke R. , Lossen O. , Schubert D. 
Published: August 2018

Abstract
The loosely bound proteins from hum an erythrocyte membranes induce an up to more than 103-fold increase in the electrical conductivity of black lipid membranes made from oxidized cholesterol. The conductivity increase continues until the membrane breaks. Its magnitude insreases with in­ creasing protein concentration and salt concentration. The results are compared with earlier results obtained with the strongly bound proteins from erythrocyte membranes.
Spontaneous Rearrangement in Langmuir-Blodgett Layers of Tripalmitin Studied by Means of ATR Infrared Spectroscopy and Electron Microscopy
Authors: Kopp F. , Fringeli U. P. , Mühlethaler K. , Günthard Hs. H. 
Published: August 2018

Abstract
1. Under the conditions used in our investigation, tripalmitin layers of the Langmuir Blodgett (LB) type undergo a spontaneous transition, leading from a liquid crystalline (LB) state to a microcrystalline (CR) state.
2. This transition is accompanied by a shift of the methylene bending band from 1469 to 1473 cm-1 and a shift of the ester group motion from about 1169 to 1182 cm-1 . In both cases the half widths of the absorption bands are reduced.
3. The two components of the methylene bending band comprise, within experimental error, all of the tripalmitin present. This is demonstrated by the constancy of the sum of the two band areas attributed to the LB and the CR state respectively. Furthermore, this observation indicates that the liquid crystalline and the crystalline state are the two main types of structural organization occuring in these layers.
The Electroantennographic Detector — a Selective and Sensitive Tool in the Gas Chromatographic Analysis of Insect Pheromones
Authors: Arn Heinrich , Städler Erich , Rauscher Stefan 
Published: August 2018

Abstract
A gas chromatographic detector is described which uses an insect antenna as a sensing element and permits the continuous monitoring of pheromones and other compounds with olfactory activity. In high-resolution gas chromatography allowing separations of positional and geometrical isomers, the electroantennographic detector gives precise information on the retention times of active compounds and permits the analysis of insect pheromones with exceedingly small amounts of material.
Energy-Linked Pyridine Nucleotide Transhydrogenase Activity in Photosynthetically Grown Rhodopseudomonas palustris
Authors: Knobloch Karl 
Published: August 2018

Abstract
Rhodopseudomonas palustris (ATCC 17001) develops energy-dependent NADP+ transhydrogenase activity while growing photosynthetically on thiosulfate, formate, or acetate as the electron donors. The enzymatic activity is present in the supernatant fraction S-.144 000. - As reported, this fraction contains small membrane fragments but no closed vesicles and was shown to drive energy-dependent reversed electron flow as well as an aerobic respiratory electron transport. The energy-dependent transhydrogenase reaction in this fraction can be driven either by ATP, ADP, or inorganic pyrophosphate, but also by acetyl phosphate or acetyl-coenzyme A in the presence of orthophosphate. - Arsenate acts as an inhibitor and decreases preferentially the acetyl-coenzyme A-dependent and the acetyl phosphate-driven reaction; whereas, oligomycin inhibits preferentially the ATP-and the acetyl phosphate-dependent reactions. - Acetate kinase and a phosphotrans-acetylase are operative in S-144 000.
Studies on Fragments of Rod Outer Segments from Bovine Retinas
Authors: Karan Hiroko I. , Brody Seymour S. 
Published: August 2018

Abstract
Vision, Monolayers, Rhodopsin, Photobiology Monolayers of fragments of our rod segments were formed at an air-water interface. The area of these particles was measured as a function of the pH of the aqueous phase. A maximum area was measured at pH 6.5.
The film was characterised by measuring the decrease in surface pressure, after compression, and the half time required to reach constant pressure. At a pH between 6 and 7 the decrease in surface pressure was a minimum.
Irradiation of films of fragments resulted in a decrease in surface potential of between 30 and 40 mV. The largest decrease occured at a pH between 6 and 6.5. A small decrease in surface pressure was also observed upon irradiation.
Mixed films of fragments and phosphatidyl ethanolamine were examined. Irradiation of the mixed film resulted in a 70 mV decrease in surface potential.
UV-Induction of Thymine-Containing Dimers in Saccharomyces cerevisiae
Authors: Fäth W. W. , Brendel M. 
Published: August 2018

Abstract
In haploid and diploid S. cerevisiae the dimer yield ratio TT̂/CT̂ is found to be 1.2/1 and 1.3/1, resp., at the UV (254 nm) unit dose 1 erg/mm2, the share of TT̂ and CT̂ in a UV (254 nm) lethal hit being 0.7 TT̂ and 0.6 CT̂. A general formulation of the UV lethal hit is given and discussed. The TT̂ + CT̂ yields obtained for S. cerevisiae are compared to those reported for other organisms. It is found that there obviously exists a directly proportional linear correlation between genome size and TT̂ + CT̂ yield for the UV dose range well below the stationary levels of the TT̂ and CT̂ formation kinetics.
Phase Shifting Effect of Caffeine in the Circadian Rhythm of Phaseolus coccineus L
Authors: Mayer W. , Scherer I. 
Published: August 2018

Abstract
Caffeine, Circadian Rhythm, Sleep and Wakefulness, Phaseolus coccineus L. 4-hour caffeine pulses (10 mᴍ) offered via the trans­ piration stream advances or delays the phase of the circadian leaf movement rhythm of Phaseolus coccineus as a function of the phase of application. It is hypothesized that the caffeine effect upon sleep and wakefulness in man is partly due to this phase-shifting effect.
Untersuchung einer Resonanz des karzinogenen Benzpyren. Studies on a Resonance of Carcinogenic Benzpyrene
Authors: Böhm P , Popp F 
Published: August 2018

Abstract
The a- and p-states of 3.4-benzpyrene are calculated by use of common param eters and of a param eter set which predicts the quasi-degeneracy of these states.
The quasi-degeneracy will be represented by the breakage of pairing theorem and is to be described as a correlation effect, caused by an asymmetric potential.
An external field represents an external perturbation, introduced by interaction with the bioreceptor. The calculation shows a sensitive dependence of probability amplitudes for different configurations which participate in the quasi-degenerated resonance states. Thereby the dipole moment may quickly be changed so that excitons are produced. The resonance phenomenon may lead to the carcinogenic effect
Zur Berechnung des Stoffumsatzes bei Photoreaktionen
Authors: Mauser Heinz 
Published: August 2018

Abstract
A simple but efficient approxim ation method for the integration of differential equations in photokinetics is described. The method can be used in case of weakly and strongly absorbing solutions as well. The rate laws can be calculated as precisely as wanted. The application of this method is not lim ited to simple photoreactions. The procedure and the formalism are shown for the reactions
The Effect of an Antiserum to Plastocyanin on Various Chloroplast Preparations
Authors: Schmid Georg , Radunz Alfons , Menke Wilhelm 
Published: August 2018

Abstract
A monospecific antiserum to tobacco plastocyanin agglutinates strom a-free sw ellable chloroplasts from wild type tobacco, (Nicotia na tabacum var. John William’s Broadleaf) from the tobacco aurea mutant Su/su2, (Nicotiana tabacum var. Su/su2) from Antirrhinum majus and spinach (Spi-nacia oleracea). In this condition the antiserum inhibits linear photosynthetic electron flow in tobacco and spinach chloroplasts. This inhibition of electron transport as well as the agglutination are not observed if the chloroplasts have been sonicated prior to antiserum addition. This is due to the fact that plastocyanin is removed by ultrasonication. The antiserum stimulates a number of photophosphorylation reactions in tobacco chloroplasts. This stimulation is always larger in the aurea mutant chloroplasts and in chloroplasts from yellow leaf patches of a variegated tobacco mutant (N . tabacum , var. NC95) than in the green type chloroplasts. The stimulation appears to be a consequence of the inhibition of linear electron transport. The antiserum does not affect PMS-mediated cyclic photophosphorylation in tobacco chloroplasts from the wild type whereas the reaction appears stimulated in the tobacco mutant chloroplasts. However, menadione-mediated cyclic photo­ phosphorylation is inhibited upon addition of the antiserum. The same is true for noncyclic photo­ phosphorylation coupled to electron transport in the aerobic system diaminodurene/ascorbate → methylviologen in the presence of N-tetraphenyl-p-phenylenediamine in spinach chloroplasts.
If the lamellar system of Antirrhinum and spinach has lost its swellability neither agglutination nor inhibition of electron transport is observed. However, also in this state antibodies to plasto­ cyanin are specifically adsorbed onto the surface of the thylakoid membrane. This state which is characterized by a morphologically well preserved lamellar system is realized in chloroplast prepa­ rations from Antirrhinum and spinach and is termed stroma-freed, chloroplasts.
In both states of the molecular structure of the thylakoid membrane, plastocyanin is located in the outer surface of the thylakoid. However, it cannot be excluded that functioning plastocyanin is also located in the interior of the thylakoid membrane.
The Biosynthesis of 4-Methylsulfinyl-3-butenylglucosinolate (Glucoraphenin) in Matthiola Species / Evidence for Homomethionine and 2-Amino-6-methylthiocaproic Acid as Intermediates
Authors: Löffelhardt W. , Kindi H. 
Published: August 2018

Abstract
[35S] L-Methionine and [methyl-14C] ʟ-methionine were fed to shoots of Matthiola annua and Matthiola sinuata. The label from both precursors was incorporated to a high degree into 4-methylsulfinyl- 3-butenylglucosinolate, the main mustard oil glucoside of M atth iola species. Two homologues of methionine, homomethionine and 2-amino-6-methylthiocaproic acid, were also labelled in these experiments. 2-Amino-6-methylthiocaproic acid, deriving from methionine via homomethionine by two successive C1-chain elongation steps, was higher plants
A Model of Pheromone Molecule-Acceptor Interaction
Authors: Kafka Wolf A. , Neuwirth Jürgen 
Published: August 2018

Abstract
Multiple binding interactions between odor molecules and acceptors are formulated by means of the Boltzmann statistics and intermolecular bond energies. Number, spatial arrangement and electronic properties of binding positions of the acceptor can be defined such that the specificity of sex pheromone receptors in male noctuid moths is quantitatively described.