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1

Digitale Medien

Inhibition of the metabolism of ram spermatozoa by derivatives of α-chlorohydrin (1981)

Brown-Woodman, P. D. C. ; White, I. G. ; Ridley, D. D.

New York, NY : Wiley-Blackwell

Gamete Research 4 (1981), S. 203-217

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ISSN: 0148-7280

Schlagwort(e): α-chlorohydrin ; antifertility agent ; ram ; sperm metabolism ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: The effects of the male antifertility agent, α-chlorohydrin, six of its derivatives, and glycidol were studied on the metabolism of washed ram spermatozoa in vitro with fructose as substrate. The α-chlorohydrin derivatives were the amino, the phosphorylated, and four glycol-bridge (ketal) compounds. All compounds except glycidol, in a concentration between 0.1 and 100 mM, reduced the aerobic glycolsis and/or oxidation of fructose. However, there was not a high correlation between the ability of these compounds to inhibit the metabolism of ram spermatozoa in vitro and their antifertility activity when administered to male rats. Other factors are clearly involved in their antifertility activity, eg, the concentration of the compounds in the epididymis and their conversion of either more or less spermicidal compounds in the body.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mrd.1120040305

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2

Digitale Medien

A crustacean statocyst with only three hairs: Light and scanning electron microscopy (1981)

Rose, R. D. ; Stokes, D. R.

New York, NY : Wiley-Blackwell

Journal of Morphology 169 (1981), S. 21-28

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Standard histological and SEM techniques have been used to examine the pair of statocyst organs located in the telson of the isopod, Cyathara polita. Each organ is formed as an invagination of the dorsal cuticle of the telson. The invagination narrows to form a stalk between the statocyst and dorsal surface. A canal courses longitudinally through this stalk and forms a continuous channel between the lumen of the cyst and the external environment. On the luminal floor of each statocyst, there are three pits; each correlates with a nodule protruding from the ventro-medial wall. From each pit, a single, bifurcating hair projects dorsally to contact the single concretion within the statocyst lumen. No other static organs have been found in this animal. Thus, maintenance of equilibrium in this species appears to be under the control of but six hairs, three in each statocyst. Innervation of each statocyst is provided by a branch of a nerve which connects anteriorly with the last abdominal ganglion.

Zusätzliches Material: 13 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1051690103

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3

Digitale Medien

Chronic exposure to 60-Hz electric fields: Effects on pineal function in the rat (1981)

Wilson, Bary W. ; Anderson, Larry E. ; Ian Hilton, D. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 2 (1981), S. 371-380

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ISSN: 0197-8462

Schlagwort(e): electric fields ; 60 Hz ; pineal gland ; circadian rhythm ; melatonin ; 5 methoxytryptophol ; acetyl transferase ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Physik

Notizen: As a component of studies to search for effects of 60-Hz electric field exposure on mammalian endocrine function, concentrations of melatonin, 5-methoxytryptophol, and serotonin-Nacetyl transferase activity were measured in the pineal glands of rats exposed or sham-exposed at 65 kV/m for 30 days. In two replicate experiments there were statistically significant differences between exposed and control rats in that the normal nocturnal increase in pineal melatonin content was depressed in the exposed animals. Concentrations of 5-methoxytryptophol were increased in the pineal glands of the exposed groups when compared to shamexposed controls. An alteration was also observed in serotonin-N-acetyl transferase activity, with lower levels measured in pineal glands from exposed animals.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bem.2250020408

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4

Digitale Medien

Spirocyclische Titanamide mit der Diphenylsila-titanadiazacyclobutan- Baueinheit. Kristall- und Molekülstruktur von Ti[(NSiMe3)2SiPh2]2 [1]Professor Marianne Baudler zum 60. Geburtstage am 27. April 1981 gewidmet (1981)

Beiersdorf, W. D. ; Brauer, D. J. ; Bürger, H.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 475 (1981), S. 56-66

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ISSN: 0044-2313

Schlagwort(e): Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Durch Umsetzung der N-lithiierten Silylamine Ph2Si(NHR)2 mit SiCl4 bzw. TiBr4 wurden die spirocyclischen Amide B (R = Me, Et, i-Pr) und C (R = i-Pr, Me3Si) dargestellt und ihre Konstitution durch Analysen, 1H- und 29Si-NMR-Spektren gesichert. Von C, R = Me3Si, wurde an einem Einkristall eine Röntgenstrukturanalyse durchgeführt. Wichtige Strukturdaten sind: TiN 1,918(2) Å, SiN endocycl. 1,750(2) Å, exocycl. 1,738(2) Å, ∢ SiNTi 90,3(1)°.Spirocyclic Titanium Amides Containing the Diphenylsila-titana-diazacyclobutane Fragment. Crystal and Molecular Structure of Ti[(NSiMe3)2SiPh2]2By reaction of the N-lithiated silylamines Ph2Si(NHR)2 with SiCl4 and TiBr4, the spirocyclic amides B (R = Me, Et, i-Pr) and C (R = i-Pr, Me3Si) respectively have been prepared. Their constitutions have been confirmed by elemental analyses and by 1H and 29Si nmr spectroscopy. C, R = Me3Si, has been investigated by a single crystal x-ray structure analysis. Important structural parameters are: TiN 1.918(2) Å, SiN endocycl. 1.750(2) Å, exocycl. 1.738(2) Å, ∢ SiNTi 90.3(1)°.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/zaac.19814750408

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5

Digitale Medien

Growth and metabolism of rodents exposed to 60-Hz electric fields (1981)

Hilton, D. I. ; Phillips, R. D.

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 2 (1981), S. 381-390

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ISSN: 0197-8462

Schlagwort(e): 60-Hz electric fields ; body weight ; oxygen consumption ; rat ; mouse ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Physik

Notizen: There have been a number of reports in the literature concerning growth-related changes in various animal species exposed to high-strength electric fields. Many of the laboratories reporting such effects have not documented and controlled for the secondary factors that are associated with generating high-strength electric fields (ie, corona, ozone, harmonic distortion, cage vibration, spark discharge). We have designed an exposure system in which we eliminated or minimized these secondary factors, therefore enabling us to examine only the effects of electric fields per se. Sprague-Dawley rats and Swiss-Webster mice were exposed to 60-Hz electric fields at kV/m for up to four months. In 17 individual experiments, we found a greater number of experiments in which the exposed rats had lower body weights than controls. This trend was not evident in data obtained from 14 individual mouse experiments. In more exhaustive growth studies, we found no significant differences in body weights, organ weights, or O2 consumption between exposed and sham-exposed controls. Our failure to detect any major changes in growth was probably the result of eliminating or minimizing the secondary factors associated with electric field exposure.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/bem.2250020409

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6

Digitale Medien

Influence of homoeotic genes on the aldehyde oxidase pattern in imaginal discs of Drosophila melanogaster (1981)

Sprey, Th. E. ; Segal, D. ; Sprey-Pieters, H. E. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Developmental Genetics 2 (1981), S. 75-87

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ISSN: 0192-253X

Schlagwort(e): Drosophila melanogaster ; homoeosis ; imaginal discs ; aldehyde oxidase ; pattern formation ; compartments ; selector genes ; Life and Medical Sciences ; Genetics

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: In a study of the regulation of enzyme patterns in imaginal discs the aldehyde oxidase pattern was determined for some homoeotic mutations of D. melanogaster. Earlier indications that suggested that this pattern follows the determinitive state of compartments within imaginal discs were confirmed by the aldehyde oxidase (AO) pattern of both the wing and haltere discs from en1; bx3, en1; pbx, and en1; bx3 pbx larvae and the antennal discs from Antp73b and ssa larvae.We additionally analyzed whether AO activity depended on the determinative state of an entire compartment or was expressed autonomously in clones. Homozygous engrailed clones were induced by mitotic recombination. From the AO clones found in normally negative areas of the posterior compartment it was concluded that enzyme activity depended upon the determinative state of the cells and was not a function of the compartment as a whole.The results are described with reference to a scheme in which compartmental and subcompartmental selector genes are thought to determine a binary code on which AO patterns depend.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/dvg.1020020107

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7

Digitale Medien

Kinetics and mechanism of the thermal decomposition of cyclopentyl cyanide (1981)

King, Keith D. ; Goddard, Richard D.

New York, NY : Wiley-Blackwell

International Journal of Chemical Kinetics 13 (1981), S. 755-770

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ISSN: 0538-8066

Schlagwort(e): Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The thermal decomposition of cyclopentyl cyanide has been investigated in the temperature range of 905-1143 K using both conventional stirred-flow reactor and very low-pressure pyrolysis (VLPP) techniques. The results from both techniques are consistent. The main primary processes are HCN elimination to form cyclopentene: and ring fragmentation to form vinyl cyanide plus propylene and ethylene plus cyanopropenes: Under the experimental conditions cyclopentene undergoes further decomposition to cyclopentadiene plus hydrogen. There is evidence for conversion of some of the reactant to a solid residue, presumably polymer. From the stirred-flow reactor results the following Arrhenius expressions were obtained: log k1(s-1) = (12.8 ± 0.3) - (65.6 ± 1.3)/θ and log k2(s-1) = (16.0 ± 0.3) - (80.0 ± 1.1)/θ, where θ = 2.303RT kcal/mol. Application of RRKM theory shows that the VLPP experimental rate constants are consistent with high-pressure Arrhenius parameters given by log k1(s-1) = (12.8 ± 0.3) - (67.8 ± 2.5)/θ for HCN elimination, and log k4(s-1) = (16.3 ± 0.3) - (80.1 ± 2.0)/θ for the sum of the ring fragmentation pathways. The rate parameters for HCN elimination are in good agreement with previous VLPP studies of alkyl cyanides and with theoretical predictions. The difference in activation energies for the ring opening of cyclopentane and cyclopentyl cyanide is reasonably close to the established value for the cyano stabilization energy. This supports the assumption of a biradical mechanism.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/kin.550130807

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8

Digitale Medien

On the Michaelis-Menten behavior of pyridinium chloro chromate oxidations: Oxidation of dimethyl, dipropyl, and diphenyl sulfide in chlorobenzene-nitrobenzene mixtures (1981)

Panigrahi, G. P. ; Mahapatro, D. D.

New York, NY : Wiley-Blackwell

International Journal of Chemical Kinetics 13 (1981), S. 85-96

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ISSN: 0538-8066

Schlagwort(e): Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The kinetics of oxidation of dimethyl, dipropyl, and diphenyl sulfides by pyridinium chloro chromate in chlorobenzene-nitrobenzene mixtures are reported. The rate data show Michaelis-Menten behavior. The oxidation process is catalyzed by the organic acids like dichloro and trichloro acetic acids. The rate-determining step appears to be a unimolecular decomposition of a complex of the reactants.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/kin.550130108

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9

Digitale Medien

Comparative analysis of the development of the lizard, Liolaemus tenuis tenuis. II. A series of normal postlaying stages in embryonic development (1981)

Lemus, D. ; Illanes, J. ; Fuenzalida, M. ; [weitere]

New York, NY : Wiley-Blackwell

Journal of Morphology 169 (1981), S. 337-349

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: In this work, we have completed a study of the development of the ovoviviparous lizard Liolaemus tenuis tenuis. Ovoviviparity in this lizard is a condition in which eggs are retained within the reproductive duct for about 60 days. During this period the phases of segmentation, gastrulation, neurulation, presomitic, and somitic embryos transpire. During the months of December and January the eggs are laid, and at this time the embryos are comparable to stage 27 Liolaemus gravenhorsti lizard embryos, or to stage 29 Calotes versicolor lizard embryos. Differentiation of the facial region occurs between Days 12 and 42 after egg laying. Limbs develop rapidly between the 8th and 23rd days. By 53 days the appendicular skeleton is completely formed. After 36 days the mesonephros begins to degenerate, and its function is gradually taken over by the developing metanephros. Newborn lizards do not possess an egg caruncle. During the period up to hatching, there is a great increase of liquid within the egg, presumably amniotic fluid. Cracks develop in the leathery shell shortly before hatching and are, perhaps, the first sign of the onset of hatching. Increase of liquid in the egg during postlaying development accounts for its increase in weight and change in shape. Weight of the embryo at hatching does not exceed 32% of the total weight of the egg.

Zusätzliches Material: 27 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1051690307

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10

Digitale Medien

Analysis of mesenchyme in the developing hind limb of Rana pipiens larvae with implications for neural development (1981)

Pollack, Emanuel D. ; Richmond, Mary

New York, NY : Wiley-Blackwell

Journal of Morphology 169 (1981), S. 253-257

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Mesenchyme in the hind limbs of Rana pipiens tadpoles may serve as an important influence on the development of specific neural structures involved in limb innervation. Thus a histological quantification of mesenchyme was undertaken to identify landmark stages with respect to mesenchyme presence and neural events. Mesenchyme remained as a high percentage of the limb tissue until stage V (Taylor-Kollros stages, '46), after which it declined dramatically until its virtual absence after stage XI. The volume of mesenchyme, however, was greatest at stages VIII-IX. Periods of high and low mesenchyme content were correlated in time with potential limb involvement in regulating limb innervation and motor neuron loss from the lateral motor columns. This provides additional evidence for developmental relationships between events of the limb and neural tissues.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1051690210

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