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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 112 (1990), S. 6388-6389 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 113 (1991), S. 8561-8562 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 3 (1956), S. 489-497 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Eine gründliche Revision vonHolcoponera ist sehr erschwert, einmal durch frühere mangelhafte Beschreibungen, dann durch Santschis übermässige Aufgliederung in seiner Revision von 1929, und durch die Schwierigkeit alle betreffenden Typen sehen zu können. Einige neuen Synonymen wurden festgestellt;H. striatula var.antillana Santschi ist nur eine individuelle Variante vonStriatula, und kann daher nomenclatorisch unbeachtet bleiben.H. simplex Emergy schliesst als individuelle Varianten, ohne Anspruch auf formelle Namen, die drei sogenannten Arten oder Unterarten aus Costa Rica ein (Simplex s. str., satzgeri Forel andforeli Santschi). Das Auftreten von die synonymischeH. spurium Forel in Guatemala ist zweifelhaft. Die Artrelicta Mann wurde von der GattungRhopalopone zu der GattungHolcoponera überführt. Die neue ArtH. mina verknüptH. relicta mit den andern Arten dieser Gattung. Zwei Arten sind neu beschreiben:H. mina (Bolivien und Peru) undH. acuta (Bolivien).
    Abstract: Résumé Il est difficile de faire une revision complète desHolcomponera, à cause des mauvaises descriptions publiées jusqu'ici, du morcellement excessif introduit parSantschi dans son travail de 1929 et de l'impossibilité d'examiner tous les types se rapportant au genre. Des synonymies nouvelles sont proposées pour quelques cas particulièrement litigieux.H. striatula var.antillana Santschi est traité comme une variation individuelle destriatula et le nomantillana devra donc disparaître de la nomenclature.H. simplex Emery comprendra comme variations individuelles, sans nom particulier, les trois espèces ou sous-espècessatzgeri Forel,spurium Forel etforeli Santschi, du Costa Rica, avec une seule localité douteuse du Guatémala. L'espèce décrite commeRhopalopone relicta Mann est transférée au genreHolcoponera, par suite des caractères de transition deH. mina sp. nov.-H. mina, de la Bolivie et du Pérou, etH. acuta, de la Bolivie, sont décrits comme espèces nouvelles.
    Notes: Summary InHolcoponera, thorough revisionary work is rendered difficult by the poor quality of previous descriptions, by the excessive splitting ofSantschi in his revision of 1929, and by the difficulty of seeing all of the types involved. New synonymy is offered where the need is obvious in a few cases.H. striatula var.antillana Santschi proves to be an individual variant ofstriatula and is unworthy of nomenclatorial distinction.H. simplex Emery includes, as individual variants without claim to formal names, the three nominal species or subspecies from Costa Rica (simplex s. str., satzgeri Forel andForeli Santschi). Another synonym,H. spurium Forel, occurs doubtfully in Guatemala. The speciesrelicta Mann is transferred fromRhopalopone to the genusHolcoponera because the new speciesH. mina is intergradient between it and the otherHolcoponera species. Two new species are described:H. mina, from Bolivia and Peru, andH. acuta, from Bolivia.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 2 (1955), S. 181-186 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Bioconjugate chemistry 6 (1995), S. 587-595 
    ISSN: 1520-4812
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 6
    facet.materialart.
    Unknown
    Chicago : Periodicals Archive Online (PAO)
    Agricultural History. 26:1 (1952:Jan.) 2 
    ISSN: 0002-1482
    Topics: History , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 7
    facet.materialart.
    Unknown
    Chicago : Periodicals Archive Online (PAO)
    Agricultural History. 64:2 (1990:Spring) 315 
    ISSN: 0002-1482
    Topics: History , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 8
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Transmission electron microscope data on the morphology of exsolution lamellae, the nature of the potassium feldspar and the development of dislocations at lamellar interfaces in coherent cryptoperthites and fine microperthites are reviewed. Dislocations have been reported previously in only two crystals, and periodic dislocations noted in only one, an Or-rich microperthite. Periodic dislocations (spacing 100–150 nm) are here described from a ternary mesoperthite (Or26 Ab52 An22). Small crystallites (〈30 nm) of other phases have sometimes nucleated on the dislocations. The 020 lattice fringes of the feldspar phases have been imaged; the difference in 020 spacings can be almost entirely accommodated by the regular dislocations, so that the boundaries may be termed nearlyperfectly semicoherent. Dislocations have been found so far only in cryptoperthites with lens-shaped or straight lamellae, either in Or-rich feldspars or in Ab-rich ternary ones. In intermediate compositions with wavy or zig-zag albite lamellae, or lozengeshaped albite areas (braid microperthites) dislocations have not been observed. Strain reduction in intermediate compositions occurs by migration of lamellar interfaces from (¯601) to near (¯6¯61) as microcline forms in the diagonal association. In Ab-rich ternary feldspars the relatively high Ancontent blocks interface migration, and strain reduction occurs by nucleation of dislocations; the Or-rich feldspar phase is ‘tweed’ orthoclase. In Or-rich bulk compositions the low volume of albite exerts insufficient stress to promote microcline formation, and tweed orthoclase develops. Interfaces do not migrate, and dislocations again develop. Fields in which different potassium feldspar polymorphs occur and in which the different exsolution textures are developed are summarized on a ternary diagram.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 98 (1988), S. 431-443 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The syenitic layered series in the Klokken intrusion is surrounded by a zone (∼500 m thick) of nearly structureless unlaminated syenite followed outwards by a zone of vertically banded gabbro (≲200 m thick) at the outer rim. The unlaminated syenite is intrusive into the gabbro and develops a thin (∼2 m) transition zone of syenodiorite at the contact. A traverse across the vertical transition zone and inwards towards the layered series was sampled with a portable drill. Mafic silicates (olivine, clinopyroxene, biotite) show inward evolution in Fe/(Fe+Mg) across the syenodiorite-unlaminated syenite zones. Feldspars change rapidly across the syenodiorite zone from rocks dominated by plagioclase, in some cases together with two alkali feldspars, one a mesoperthite or cryptomesoperthite, the other a cryptoperthite, to rocks in which plagioclase is seen only rarely as cores to cryptomesoperthitic alkali feldspar crystals. Plagioclase is absent from the layered series. Alkali feldspars occurring in pairs have bulk compositions on solvus isotherms in the Or-Ab-An ternary system, estimated at 950° C in a syenogabbro and 910° C in a syenodiorite, at ∼1 kbar. The more calcic liquids from which they crystallized fractionated on paths that intersected the two- feldspar surface, whereas the more syenitic members crystallized from liquids which terminated crystallization in the one- feldspar field at ≲900° C. Plagioclases evolve from calcic andesine in syenodiorites, to very rare sodic oligoclase in the most evolved unlaminated syenites. The boundaries between plagioclase cores and alkali feldspar rims, which are usually optically abrupt, involve complex mixed zones on the μm -scale, consistent with arrested reaction between plagioclase primocrysts and crystallizing syenitic liquid. Ternary liquidus-solidus relationships are in qualitative agreement with this interpretation. The syenodiorites are cumulates produced during sidewall crystallization of a trachytic magma against a gabbroic chamberlining. This magma changed little in bulk composition as it evolved, giving rise to the unlaminated syenites by further sidewall crystallization. Water build- up in this liquid probably caused a change in style of chamber filling, giving rise to the layered series by bottom accumulation. Microtextures in the zoned feldspars are described in an accompanying paper.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 98 (1988), S. 444-454 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The microtextures developed during relatively slow cooling as a function of bulk composition in zoned ternary feldspars from syenodiorites and syenites in the Klokken intrusion, described in the preceding paper, were determined by TEM and their origin and evolution deduced. The feldspars normally have a plagioclase core and an alkali feldspar rim; cores become smaller and rims larger and the An content of both decrease with distance from the contact of the intrusion. The following microtextural sequence was observed. The inner plagioclase cores are homogeneous oligoclase-andesine with Albite growth twins only, but are crypto-antiperthitic towards the outer core. At first small platelets of low sanidine a few nanometres thick and up to ∼10 nm long occur sporadically only on Albite-twin composition planes. With further increase in bulk Or they are homogeneously distributed in the plagioclase. Thicker, through-going plates in platelet-free areas are found, which induce Albite twins in the surrounding plagioclase. The microtextures in the rims are regular cryptomesoperthitic, with (¯601) lenses or lamellae, depending on the bulk Or-content, of low sanidine in Albite-twinned low oligoclase-andesine. Albite and Pericline twins in plagioclase in an M-twin relationship, together with lenticular low sanidine, were found in only one small area. The overall diffraction symmetry of the mesoperthites is monoclinic, showing that exsolution started in a monoclinic feldspar, whereas that of the antiperthites is triclinic. The intermediate zone between the core and rim is more complex and microtextures vary over distances of a few micrometres. The cryptomesoperthites are very regular where Or-rich and probably arose by spinodal decomposition. The platelets in the outer cores arose by heterogeneous nucleation on twin composition planes and by homogeneous nucleation elsewhere. Near the intermediate zone they coarsened to give larger plates which induced Albite-twins in the plagioclase. Because of the zoning, microtextures that were initiated in areas of given composition, can propagate laterally into zones of different composition. A diagram is given showing the relationship between ternary bulk composition and the microtexture developed in coherent perthitic alkali feldspars and plagioclases from slowly-cooled rocks.
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