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  • Electronic Resource  (6)
  • 1990-1994  (6)
  • 1993  (6)
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  • Electronic Resource  (6)
Years
  • 1990-1994  (6)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Structure of hydrocotarnine hydrobromide (1993)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 175-177 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270192008576
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of cefadroxil (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 235-238 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of Cefadroxil, (7-[[amino-(4-hydroxyphenyl)acetyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo-[4.2.0]oct-2-ene-2-carboxylic acid monohydrate), C16H17N3-O5S.H2O has been determined from single crystal X-ray diffraction data. The compound crystallizes in the orthorhombic space groupP212121. The cell parameters area=11.065(3),b=11.221(4) andc=14.436(4)Å;M r=381.41;V=1792(2)Å3,z=4,D x=1.339 Mg−3;β=1.84 cm−1,F(000)=752,T=296 K,R=0.037 andR w=0.037. Theμ-lactam ring is not planar and the nitrogen atom in theβ-lactam deviates from the plane of the other three atoms attached to it by 0.224(4) Å. The thiazene ring is in the half-chair conformation. The molecules are stabilized by N-H⋯O and O-H⋯O hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190052
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure of abrine (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 167-170 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of abrine (N-methyl L-tryptophan, (C12H14N2O2) was determined by X-ray diffraction. Space groupP212121,a=5.372(1),b=8.595(1) andc=24.082(2)Å,Z=4,D m=1.30(4) gcm−3,D x=1.304 gcm−3,R=0.039 andwR=0.042. The conformational parameters for this structure following the IUPAC nomenclature areφ=67.7(5)°, ϰ1=−175(4)°, K21=105.2(7)° and χ22=−66.4(7)°; the atom C9 in the present structure is gauche to N15 andtrans to C12. The molecules exist in a zwiterionic form and are stabilized in the unit cell by N-H⋯O hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190041
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of naphazoline nitrate (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 567-570 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 2-(l-Naphthylmethyl)-2-imidazoline nitrate, C14H15N3O3,M r =273.29, orthorhombic,Pbca, a=12.033(4),b=14.387(4),c=15.913(4)Å,V=2754.9(4)Å3,Z=8,D m=1.32(3) (flotation),D x=1.318 Mgm−3, (CuKα)=1.5418 Å,μ=7.45 cm−1,F(000)=1152,T=296K, finalR=0.078,wR=0.058 for 1397 reflections withI〉 2σ(I). The naphthalene ring exhibits orientational disorder. The N-H⋯O hydrogen bonds involving both the nitrogen atoms of the imidazoline ring serve to form infinite chains of alternating naphazoline cations and nitrate anions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228766
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  • 5
    Electronic Resource
    Electronic Resource
    Preface (1993)
    Springer
    Nutrient cycling in agroecosystems 35 (1993), S. v 
    Details
    ISSN: 1573-0867
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750227
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  • 6
    Electronic Resource
    Electronic Resource
    Use of partially acidulated phosphate rocks as phosphate fertilizers (1993)
    Springer
    Nutrient cycling in agroecosystems 35 (1993), S. 47-59 
    Details
    ISSN: 1573-0867
    Keywords: Partially acidulated phosphate rocks ; phosphate rock reactivity ; soil pH ; compaction ; cogranulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Partially acidulated phosphate rocks (PAPRs) are manufactured by acidulation of PRs with less than the stoichiometric amounts of, usually, phosphoric or sulphuric acids. Products of similar composition to PAPRs are also prepared by cogranulating superphosphate with PRs. For most crops the agronomic value of PAPRs is determined by the availability to plants of their water-soluble P as well as their PR P component. The acid unreacted PR present in the directly acidulated PAPR, is considered to be less reactive than the original PR. This is probably the result of surface coatings of chemical compounds formed during acidulation. Under some soil conditions, in the presence of plants, the PR component probably dissolves faster than the original PR. For seasonal crops, except for fast growing ones such as squash (Cucurbita maxima), reactive PRs partially acidulated so that the final products contain about 50% of its total P in water-soluble form, are generally as effective as fully acidulated superphosphate. For permanent pastures the water P content may be reduced to about 40% of total P without reducing their agronomic effectiveness of the product. In medium P retentive soils pH seems to have little or no influence on the agronomic effectiveness of PAPRs. In highly P retentive soils increasing soil pH reduces the agronomic effectiveness of phosphoric PAPRs apparently by reducing the solubility of the PR component of PAPRs. Even at low pH the dissolution of unreacted PR in sulphuric PAPRs is less than that in phosphoric PAPRs, probably due to the possible coating of calcium sulphate on the residual PR in sulphuric PAPRs. Results on the agronomic effectiveness of PAPRs prepared from unreactive rocks were highly variable and no generalisation could be made regarding the degree of acidulation needed for the products to be consistently effective. Single superphosphate (SSP) cogranulated with reactive rocks (SSP/PR) was agronomically less effective than SSP, and also than phosphoric PAPRs of similar water-soluble P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750219
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