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  • Analytical Chemistry and Spectroscopy  (1,354)
  • Inorganic Chemistry  (693)
  • Fisheries
  • Humans
  • SPACE SCIENCES
  • 1990-1994  (2,486)
  • 1960-1964
  • 1990  (2,486)
Collection
Keywords
Publisher
Years
  • 1990-1994  (2,486)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    The solar wind and human birth rate: A possible relationship due to magnetic disturbances (1990)
    Springer
    International journal of biometeorology 34 (1990), S. 42-48 
    Details
    ISSN: 1432-1254
    Keywords: Briths ; Humans ; Solar wind ; Geomagnetism ; Melatonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Data obtained from the literature on the annual pattern of human conceptions and plasma melatonin at high latitudes indicated that simple annual rhythms do not exist. Instead, prominent semiannual rhythms are found, with equinoctial troughs and solsticial peaks. A prominent semiannual environmental event is the magnetic disturbance induced by the solar wind. The semiannual magnetic disturbances are worldwide, but most pronounced in the auroral zones where the corpuscular radiation enters the atmosphere. Magnetic indices that predominantly reflect these events were obtained from the literature and correlated with the melatonin and conception data. Significant and inverse correlations were found for Inuit conceptions and the melatonin data. The correlations obtained for 48 contiguous states of the United States indicated that only the extreme northern states exhibited this relationship. These data were compared with a previous correlational study in the United States which established that sunshine was correlated with conceptions in the middle latitude and southern states. An hypothesis of dual control by electromagnetic and magnetic energies is proposed: melatonin is a progonadal hormone in humans controlled by both factors, depending on their relative strength. Other studies are reviewed regarding the possible factors involved in determining the annual pattern of human conceptions. Demographic studies of geographic variation in temporal patterns of conceptions, with particular regard to variations of the magnetic fields on the earth's surface, may provide some insight into the efficacy of these different factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045819
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  • 2
    Electronic Resource
    Electronic Resource
    The effects ofTilapia introductions in Lake Luhondo, Rwanda (1990)
    Springer
    Environmental biology of fishes 27 (1990), S. 303-308 
    Details
    ISSN: 1573-5133
    Keywords: Fish introductions ; Africa ; Cichlids ; Barbus ; Haplochromis ; Lake management ; Fisheries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Cyprinid fishes apparently constituted the major part of the original fish fauna in Lake Luhondo, Rwanda, at least until 1934. At that time only three species, all cyprinids, were known from the lake:Barbus neumayeri, a small barbel, very common in the lake (described from the lake asBarbus luhondo) and two larger cyprinid species:Barbus microbarbis andVaricorhinus ruandae. These two large species were probably not very common in the lake. Between 1935 and 1938 some youngTilapia were introduced into Lake Luhondo. Since then and certainly since 1952 the large cyprinids seem to have disappeared completely from the lake. The smallBarbus neumayeri has become extremely rare; at present it survives only in some small tributaries of the lake. In the lake itselfTilapia andHaplochromis species are now the dominant fauna. A survey of the available information is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002748
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  • 3
    Electronic Resource
    Electronic Resource
    Masthead (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990) 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230101
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  • 4
    Electronic Resource
    Electronic Resource
    Chrom-Komplexe mit cyclo-Asx-Liganden (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 3-6 
    Details
    ISSN: 0009-2940
    Keywords: Pentaarsacyclopentadienyl ligand / Triarsachromatertrahedranes / Triple-decker complexes / Tetrahedrane, triarsachroma- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromium Complexes with cyclo-Asx, LigandsThe interaction of [(η5C5Me4R)(CO)2Cr]2(Cr≡Cr) (1a: R = CH3 1b: R = C2H5) with yellow arsenic (As4) affords the triarsachromatetrahedranes [(η5-C5Me4R)(CO)2Cr(η3-As3)] (2a, b) as well as the 27-VE triple-decker complexes [{(η5-C5Me4R)Cr}2-(μ,η5-As5)] (3a, b) 3 is also formed photochemically from 2. 2a and 3b have been characterized by X-ray structure analyses. The cyclo-As5 ligand forms a regular arsenic pentagon.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230102
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  • 5
    Electronic Resource
    Electronic Resource
    Bindung von Monosacchariden über die Isocyano- und Carben-Funktion an das Metall-Atom: Chrom(0), Wolfram(0)-, Rhodium(III)-, Iridium(III)-, Palladium(II)-, Platin(II)- und Gold(I)-Komplexe von 1,3,4,6-Tetra-O-acetyl-2-desoxy-2-isocyano-α-D-glucose und - β-D-glucose (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 11-17 
    Details
    ISSN: 0009-2940
    Keywords: Isocyanide complexes / Carbene complexes / Transition metal complexes / Carbohydrates / Glucose, 2-deoxy-2-isocyano-, as complex ligand ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal-Complexes of Biologically Important Ligands, LII. - Binding of Monosaccharides through the Isocyano and Carbene Group to the Metal Atom: Chromium(O), Tungsten(O), Rhodium(III), Iridium(1II). Palladium(I1). Platinum(ZI), and Gold(1) Complexes of 1.3.4.6-Tetra-O-acetyl-2-deoxy-2-isocyano-α-D-glucose and -β-D-glucoseStable isocyanide complexes cis-Cl2Pd(CNR)2 (2), cis-Cl2Pt(CNR)2 (3), cis-Cl2Pt(PPh3)CNR (4), [trans-(Ph3P)2Pt(Cl)CNR]+BF-4 (5), ClAuCNR (6), (OC)5CrCNR (7), (OC)5WCNR (8), (η5-C5Me5)Rh-(CNR)Cl2 (9), (η5-C5Me5)Ir(CNR)Cl2 (10) of 1,3,4,6-tetra-O-acetyl-2-deoxy-2-isocyano-α(β)-D-glucose (CNR) as well as carbene complexes ClAuC(NHR')(NHR) (11, 12) and cis-Cl2Pt(PPh3)C-(OR')NHR (13, 14) have been prepared and characterized by their IR and NMR spectra. The structure of 10 has been determined by X-ray crystal structure analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230104
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  • 6
    Electronic Resource
    Electronic Resource
    Übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XII1. - Übergangsmetall-Schwefelylid-Komplexe, XXVII2) Zur Umwandlung des Phosphaalkenyleisen-Komplexes (η5-C5Me5)-(CO)2FeP=C(SiMe3) 2 in η3-Phosphaallyleisen-Komplexe mittels Me2S(O)=CH2: Synthese und Molekülstruktur der beiden Isomeren von (η5-C5Me5)(CO)Fe{η3-P[CH(SiMe3)2](CHC=O)} (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 23-28 
    Details
    ISSN: 0009-2940
    Keywords: Phosphaallyl complexes / Sulfur ylides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Acylphosphines and Phosphaalkenes. XII. - Transition-Metal Sulfur Ylide Complexes, XXVIIzt - Conversion of a Phosphaalkenyliron Complex (η5-C5Me5)-(CO)2FeP=(SiMe3)2 into (η3-Phosphaallyl)iron Complexes by means of Me2S-(O)=CH2: Synthesis and Molecular Structures of Two Isomeres of (η5-C5Me5)-(CO)η5-P(CH-(SiMe3)2(CHC-0)}The transition-metal-substituted phosphaalkene (η5-C5Me5)-(CO)2FeP=C(SiMe3)2 (1) reacts with the sulfur ylide Me2S-(O)=CH2 (2) to afford the yellow η3-phosphaallyliron complex 4 with a syn-configuration in the organophosphorus ligand. In toluene solution at 40°C this complex undergoes an isomerization to the corresponding anti-configurated complex 5. Constitution and configuration of both compounds were elucidated by spectroscopic methods (IR, 1H, 13C, 31P NMR, and MS) as well as single-crystal X-ray diffraction analyses.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230106
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  • 7
    Electronic Resource
    Electronic Resource
    Diphosphabicyclobutane (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 67-69 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphabicyclobutanes / Valence isomerization ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: DiphosphabicyclobutanesTwo isomeric diphosphabicyclobutanes (5,11) are obtained by treatment of the phosphaalkenes X-P = C(Ph)Tms (1a) and X - P = CTms2 (1b) (X = halogen Tms = trimethylsilyl) with 2, Mg, or Na. Both syntheses proceed by coupling of two phosphaalkene units affording, however, two different diphospha-butadiene intermediates. 4 and 10 readily undergo isomerization reactions to form the diphosphabicyclobutanes. Irradiation of the phosphaalkenes Cp* - P = C(Ph)Tms (12a) and Cp* - P = CTms2 (12b) (Cp* = C5Me5) gives rise to a different reaction pathway. Dimerization of 12a, followed by homolytic cleavage of the Cp* - phosphorus bond and intramolecular recombination produces the butterfly compound 5, whereas homolytic cleavage of the Cp* - element bond in 12 b, followed by rearrangement and intermolecular recombination, affords the diphosphabicyclobutane 11.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230113
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  • 8
    Electronic Resource
    Electronic Resource
    Mononuclear Bis(diazadiene)ruthenium(0) Complexes and the Coupling of Butadiene to a Diazadiene System (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 83-85 
    Details
    ISSN: 0009-2940
    Keywords: Diazadienes/Carbon-carbon coupling/Ruthenium(0) complexes/Ethylene complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complexes (dad)2RuCl2 (1) (dad = diazadiene, RN = CR'- CR'=NR) are reduced to (dad)2Ru (2) which react with L = CO or ethylene to give (dad)2RuL (3,5). Reduction of 1b ( R' = H) with magnesium-butadiene or reaction of 2b with butadiene leads to a new type of C-C coupling of butadiene to one of the diazadiene ligands (6b). Addition of CO induces a rearrangement to 7b by a hydride shift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230117
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  • 9
    Electronic Resource
    Electronic Resource
    Light-Induced Conversion of 4,6,7,8-Tetrahydro-2H-benzopyran-2,5(3H)-diones into 3,5,6,7-Tetrahydrobenzofuran-4(2H)-ones in Methanol (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 101-105 
    Details
    ISSN: 0009-2940
    Keywords: Enol lactones, photochemistry of / Ketene photoextrusion / Ketones, photoreduction / 0-Heterocycles, photochemistry of ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photochemical conversion of 4,4,7,7-tetramethyl-4,6,7,8-tetrahydro-2H-benzopyran-2,5(3H)-dione (1) into 3,3,6,6-tetramethyl-3,5,6,7-tetrahydrobenzofuran-4(2H)-one (4) in methanol does not - as previously assumed - proceed by decarbonylation of the primarily formed acyl-vinyloxy biradical 2. This conclusion results from the finding that C-2, i. e. the CH2 group, of benzofuranone 4 stems from the solvent. Similar observations were made for other benzopyrandiones 15. A reaction sequence consisting of (a) ketene elimination from 2 with formation of 2-isopropylidene-5,5-dimethyl-1,3-cyclo-hexanedione and (b) light-induced (reductive) H . and . CH2OH addition to this intermediate followed by cyclization and dehydration to 4, is proposed for the conversion 1→4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230121
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  • 10
    Electronic Resource
    Electronic Resource
    Synthese von Sieben- und Achtring-anellierten Pyridinen durch “inverse” intramolekulare Diels-Alder-Reaktion mit Trifluormethyl-substituierten 1,2,4-Triazinen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 133-136 
    Details
    ISSN: 0009-2940
    Keywords: 1,2,4-Triazines / Dienophiles, side-chain / [4+21 Cycloaddition / Pyrido[2,3-e-l,4-diazepines / Pyrido[2,3-b]-1,5-diazocines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Seven- and Eight-Membered Ring-Annulated Pyridines by “Inverse” Intramolecular Diels-Alder Reaction with Trifluoromethyl-Substituted 1,2,4-TriazinesIntramolecular [4 + 2] cycloaddition reactions with inverse electron demand of trifluoromethyl-substituted 1,2,4-triazines carrying 7- or 8-membered o-alkyne side-chain dienophiles (3,8,12) lead to the synthesis of bicyclic pyridines with annulated heterocyclic seven- (5, 9, 13-15) or eight-membered rings (19, 22, 23, 26).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230125
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