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1

Digitale Medien

Peroxidatic activity in monocytes and tissue macrophages of mice (1978)

Ogawa, T. ; Koerten, H. K. ; Daems, W. Th.

Springer

Cell & tissue research 188 (1978), S. 361-373

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ISSN: 1432-0878

Schlagwort(e): Macrophages ; Monocytes ; Peroxidatic activity ; Mouse

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Summary A description is given of the distribution of peroxidatic (PO) activity in murine monocytes of blood and peritoneal cavity, and in murine macrophages residing in the unstimulated peritoneal cavity as well as in liver, spleen, bone marrow, and small intestine. In the monocytes, PO activity is restricted to some of the cytoplasmic granules; in the tissue (or resident) macrophages present in peritoneal cavity, liver, spleen, and small intestine, the PO activity is located in the nuclear envelope and the rough endoplasmic reticulum. Macrophages in the bone marrow are PO-negative. In the spleen and bone marrow, reticulum cells show PO activity in the nuclear envelope and the RER. Transitional forms between monocytes and tissue macrophages were not observed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00219778

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2

Digitale Medien

Parthenogenetic monohaploids (2n=x=12) from Solanum tuberosum L. and S. verrucosum Schlechtd. and the production of homozygous potato diploids (1977)

Breukelen, E. W. M. ; Ramanna, M. S. ; Hermsen, J. G. Th.

Springer

Euphytica 26 (1977), S. 263-271

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ISSN: 1573-5060

Schlagwort(e): Solanum tuberosum ; potato ; Solanum verrucosum ; monohaploid ; chromosome doubling ; parthenogenesis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Summary Dihaploid and dihaploid derived clones of Solanum tuberosum and diploid genotypes of S. verrucosum produced 85 viable monohaploids by female parthenogenesis. All were induced using diploid S. phureja clones, homozygous for embryo spot, as pollinator. Frequency of S. tuberosum monohaploids per 100 berries was rather constant in three successive years (14, 17 and 17 respectively). No male and female fertility was found in flowering monohaploids. Colchicine-induced chromosome doubling yielded homozygous s. tuberosum diploids with low pollen quality but good seed fertility. Two diploid self-incompatible species (S. multidissectum and S. berthaultii) produced no monohaploids. The presence of genes for female parthenogenesis in some dihaploids is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00026987

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3

Digitale Medien

Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 4. Linkage between an S-bearing translocation and a locus for virescens (1978)

Hermsen, J. G. Th.

Springer

Euphytica 27 (1978), S. 381-384

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ISSN: 1573-5060

Schlagwort(e): Solanum tuberosum ; potato ; self-compatibility ; dihaploid ; linkage ; virescens ; translocation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Summary Three dihaploids of Solanum tuberosum (two self-compatible, one self-incompatible) were found to be heterozygous for a monogenic recessive virescent mutant. Intercrossing resulted in the expected 3 : 1 ratio only in crosses involving one self-compatible and one self-incompatible parent. Self-compatible x self-compatible matings produced F1's in which 6:1 was found. The same ratio was observed in the self progeny of the two self-compatible dihaploids. This significant deviation could be explained by assuming linkage (25% crossing-over) between v and an S-bearing translocation. This translocation causes self-compatibility in the dihaploids used and early lethality when homozygous.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00043162

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4

Digitale Medien

Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 5. The S-genotype of tetraploid potato cultivar gineke (1978)

Hermsen, J. G. Th. ; Sonneveld, J. ; Vreugdenhil, D. ; [weitere]

Springer

Euphytica 27 (1978), S. 385-388

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ISSN: 1573-5060

Schlagwort(e): Solanum tuberosum ; potato ; incompatibility ; dihaploid

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Summary Investigations of the genetics of self-compatibility and self-incompatibility in dihaploids and diploid derivatives from cv. Gineke revealed the presence of S 1, S2 and S 3 at the S-locus of Gineke and in addition an S 1-allele on a translocation. By means of a complete tester set involving the S-alleles S 1, S2 and S 3 (all from Gineke) and S 4 (from Black 4495) it was demonstrated that some Gineke dihaploids were compatible with all six testers. This indicated a fourth S-allele in Gineke, which differs from those in the tester series and was therefore assigned S 5. Additional evidence was obtained from an analysis of F1's from crosses of two S 5-bearing dihaploids and one of the testers. So the S-genotype of cv. Gineke was identified as S 1S2S3S5/S1, the second S 1 being the S-allele on a translocated fragment.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00043163

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5

Digitale Medien

Determination of the base-pairing content of four specific tRNAs by infrared spectroscopy (1977)

Schernau, U. ; Ackermann, Th.

New York : Wiley-Blackwell

Biopolymers 16 (1977), S. 1735-1745

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ISSN: 0006-3525

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Infrared spectroscopy was used for the determination of the base-pairing content of four specific tRNAs in deuterium oxide solution. Infrared spectra were obtained in the 1750-1550 cm-1 region at various temperatures ranging from about 15 to 90°C. Melting curves were constructed by plotting the molar extinction coefficient at ν = 1657 cm-1 versus temperature. These transition curves enabled us to determine the ranges of temperature which correspond to the ordered (partially double-stranded) or randomly coiled structure of the tRNA. For a set of wavenumbers the extinction coefficients at these temperatures were used for the calculation of the base-pairing content. The procedure employed here is based on a method described earlier by Thomas [(1969) Biopolymers 7, 325-334]. For the conditions selected for this investigation (Mg2+-free D2O-buffer; 0.01M tris-DCl, 0.015M NaCl, pD 7.5) the results of this determination agree within the limits of errors with the number of base pairs predicted by the cloverleaf model.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bip.1977.360160810

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6

Digitale Medien

Free radicals in colloidal systems: Formation and decay of radicals in the tensides α-hexadecyl-ω-hydroxypoly(oxyethylene) and α-tetradecyl-ω-(sodium sulfonato)tri(oxyethylene) (1978)

Henglein, A. ; Proske, Th.

New York : Wiley-Blackwell

Die Makromolekulare Chemie 179 (1978), S. 2279-2295

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ISSN: 0025-116X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Organic radicals were produced in the tensides C16H33(OCH2CH2)21OH and C14H29(OCH2CH2)3-SO3Na in aqueous solutions using a short pulse of high energy electrons. The radicals were formed by OH attack on the (OCH2CH2)x-parts of the tensides. The decay of the 250nm absorption of the radicals was recorded at different initial radical concentrations and tenside concentrations. Several radicals could be produced in one micelle. Radicals formed in the same micelle decay within microseconds or faster. The half life time τ1 in a micelle carrying two radicals is 2,0·10-6 s for C16H33(OCH2CH2)21 OH and less than 6·10-7 s for C14H29(OCH2CH2)3SO3Na. A model for intramicellar radical-radical reactions is proposed according to which the rate is faster in tensides of high critical micelle concentration. Single radicals in micelles of C16H33(OCH2CH2)21OH can deactivate each other without leaving the micelles. This intermicellar reaction is discussed in terms of the rate of diffusion-controlled micelle-micelle encounters, an encounter time of 7·10-8s, and the above time τ1 for intramicellar reaction. The observed rate constant 2k of intermicellar reaction is 3,5·106 mol-1·l·s-1. At low tenside concentrations, the bimolecular rate constant increases since more single tenside radicals are present in solution. They react rapidly (ca. 108 mol-1·l·s-1) with radicals in micelles. Single radicals in C14H33(OCH2CH2)3-SO3Na micelles cannot directly react with each other because of the Coulombic repulsion between two anionic micelles. Reaction occurs after the exit of a tenside radical from its micelle, the rate of which depends on the micellar equilibrium Mn⇄Mn-1+M (M: tenside molecule; n: agglomeration number of micelle). A single radical in solution reacts with a single radical in a micelle with 2k = 1,0·108 mol-1·l·s-1 and with another single radical in solution with 4,0·107 mol-1·l·s-1.γ-Irradiation of both tensides in aqueous solution leads to slight increases in viscosity, followed by turbidity beyond the “gel dose” and phase separation. These effects are explained in terms of crosslinking of tenside molecules. Formation of a large network requires bridges between all participating tenside molecules (not only bridges between micelles).

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/macp.1978.021790915

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7

Digitale Medien

The interrelationship of structure and retetion of polyhalogenated aromatics in adsorption chromatography (1978)

Brinkmann, U. A. Th. ; de Vries, G. ; Turkenburg, L. A. M.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 1 (1978), S. 97-97

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ISSN: 0935-6304

Schlagwort(e): Liquid Chromatography ; Structure and relation of polyhalogenated aromatics ; discussed ; Silica gel/aluminium oxide compared ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240010207

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8

Digitale Medien

Automated glass capillary gas chromatographic analysis of PCB and organochlorine pesticide residues in agricultural productsPresented at the XXXI International Symposium on crop Protection in Gent (Belgium). May 1979. (1979)

Th. Tuinstra, L. G. M. ; Traag, W. A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 2 (1979), S. 723-728

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, glass ; Separation of polychloro biphenyls ; Separation of organochlorine pesticides ; Splitless automated injection ; Residue level ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Complicated PCB mixtures can be separated in individual compounds using glass capillary gas chromatography, (GC)2. Depending on extraction and clean-up procedure it is also possible to separate and determine organochlorine pesticides at the same time.This (GC)2 technique can be used to determine the contents of individual chlorinated biphenyls in milk products and animal feedstuffs and in the analysis of complicated extracts of soil and vegetable material.Practical aspects concerning connection of the capillary, automatic splitless injection, repeatability of the retention time, quality of the column with respect to separation and adsorption and degradation of DDT are discussed.The detection of individual chlorinated biphenyls is possible at the ppb level in fats and vegetable materials, using an extraction and clean-up procedure, based on saponification of the sample.Preliminary results for milk, obtained from several areas, are shown.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240021206

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9

Digitale Medien

Comprehensive Two-Dimensional Gas Chromatography with a Rotating Thermal Desorption Modulator and Independently Temperature-Programmable Columns (2000)

de Geus, Henk-Jan ; Schelvis, Adolf ; de Boer, Jacob ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 23 (2000), S. 189-196

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ISSN: 0935-6304

Schlagwort(e): Comprehensive two-dimensional gas chromatography ; thermal desorption modulator ; temperature programming ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: ---In comprehensive two-dimensional gas chromatography, two individual separations are coupled by means of a rotating thermal desorption modulator interface. The injection pulse introduced via the interface onto the second column should be as short as possible. Parameters affecting the modulator operation are studied. In the set-up used in this study, the temperature of the second column can be programmed independently from that of the first column. Optimization of the second-dimension separation to minimize peak broadening and maximize resolution is discussed and an elegant approach to determine second-dimension retention times using a non-constant modulation frequency is demonstrated. The high separation power of the comprehensive system is demonstrated by the analysis of technical and biota samples containing chlorinated biphenyls and toxaphene.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

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10

Digitale Medien

Form und Mechanismen von Rissen und Brüchen unter gleichzeitiger korrosiver und dynamischer Beanspruchung mit unterschiedlichen Frequenzen (1978)

Schmitt-Thomas, Kh. G. ; Kriner, Th.

Weinheim : Wiley-Blackwell

Materialwissenschaft und Werkstofftechnik 9 (1978), S. 406-413

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ISSN: 0933-5137

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Beschreibung / Inhaltsverzeichnis: Form and Mechanisms of Cracks and Fractures Caused by Simultaneous Corrosive and Dynamic Stress under Various FrequenciesDistinction of crack nucleation and crack propagation under variable frequencies and electrolytic corrosion. Relationship between crack nucleation and frequency due to differing sliding mechanisms. Crack propagation under decreasing frequencies causes transition from corrosion fatigue to cyclic stress corrosion cracking and finally stress corrosion cracking can be observed. Coordination of that transition with the increasing influence of the KISCC-value as determinant of the crack propagation.The influence of frequency on high temperature materals in hot gas atmosphere is mainly determined by creep mechanisms during top-load phase and the gas-metal-reactions. Accordingly the life time increases with growing load frequency.

Notizen: Anrißphase und Phase des Rißfortschritts bei der Betrachtung der Frequenzabhängigkeit unter elektrolytischer Korrosion. Abhängigkeit der Anrißphase von der Frequenz infolge unterschiedlicher Gleitmechanismen. Beim Rißfortschritt erfolgt mit sinkender Frequenz Übergang von Schwingungsrißkorrosion zu zyklischer Spannungsrißkorrosion und schließlich zu Spannungsrißkorrosion. Zuordnung dieses Übergangs zum zunehmenden Einfluß des KISCC-Wertes als Bestimmungsgröße für den Bruchvorgang.Frequenzabhängigkeit bei Hochtemperaturwerkstoffen in Heißgasatmosphäre im wesentlichen bestimmt durch Kriechvorgänge bei Einwirkung der Oberlast und zeitabhängige Gas-Metall-Reaktionen. Entsprechend verlängern sich die Standzeiten mit zunehmender Belastungsfrequenz.

Zusätzliches Material: 16 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mawe.19780091108

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