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  • 1
    Series available for loan
    Series available for loan
    Regionalgeologische Erkundungen entlang der GEOLIMEX-Traverse in Südmexico, unter besonderer Berücksichtigung der Sierra de Juárez, Oaxaca. (1995)
    Clausthal-Zellerfeld : Selbstverl. der Geowissenschaftlichen Institute der Techn. Univ. Clausthal
    Associated volumes
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    Call number: SR 91.1170(47)
    In: Clausthaler geowissenschaftliche Dissertationen
    Type of Medium: Series available for loan
    Pages: 105 S.
    Series Statement: Clausthaler geowissenschaftliche Dissertationen 47
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Dosimetric characteristics of ultraviolet and x-ray-irradiated KBr:Eu2+ thermoluminescence crystals (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1068-1070 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermoluminescence (TL) characteristics of KBr:Eu2+ (150 ppm) previously exposed to ultraviolet (UV) light (200–300 nm) and x-ray radiation at room temperature have been determined. The TL glow curve of UV-irradiated samples is composed of six peaks located at 337, 384, 402, 435, 475, and 510 K. The TL glow curves of x-irradiated samples show mainly a TL peak around 384 K. The TL intensities of UV-irradiated (402 and 510 K glow peaks) and x-irradiated specimens present a linear dependence as a function of radiation dose as well as fading stability 300 s after irradiation. These results further enhance the possibilities of using europium-doped materials in nonionizing (actinic region) and ionizing radiation detection and dosimetry applications. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116933
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  • 3
    Electronic Resource
    Electronic Resource
    Dosimetric properties of KCl:Eu2+ under α, β, γ, x ray, and ultraviolet irradiation (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3398-3400 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermoluminescence (TL) characteristics of KCl:Eu2+ subjected to α, β, γ, x ray, and ultraviolet (UV) radiation (200–300 nm), as well as the dose response was investigated. The TL glow curve structure is very similar for any type of irradiation used with differences only in the peak intensities; it has good reproducibility. Also, the dose response is linear for all types of irradiations. These results allowed us to conclude that the KCl:Eu2+ crystals may be used as a dosimeter for ionizing and nonionizing radiation © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116516
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  • 4
    Electronic Resource
    Electronic Resource
    Fading and self-irradiation of potassium halide thermoluminescence dosimeters (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 3126-3127 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fading characteristics of KCl:Eu2+ (150 ppm) thermoluminescent crystals is determined. It is shown that the fading cannot be correctly measured without taking into account the phenomenon of self-irradiation of the crystals, due to natural radioactive nuclide 40K which is presented in potassium halide dosimeters. The results obtained can be useful in those applications of KCl: Eu2+ crystals dealing with long-time exposures, or low-dose levels of radiation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113624
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  • 5
    Electronic Resource
    Electronic Resource
    Actinometric thermoluminescence response of KCl1−xBrx:Eu2+ mixed crystals (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1388-1390 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Europium-doped KCl1−xBrx mixed crystals have been studied as a selective ultraviolet (UV) detector material in the actinometric region (200–300 nm). Thermoluminescence glow curves of room-temperature UV-irradiated samples were analyzed as a function of composition x and irradiation wavelength. A thermoluminescence enhancement, relative to the pure KCl and KBr end components is found; for 210–300 nm irradiation the KCl40Br60:Eu2+ solid solution presents a significant increase in thermoluminescence efficiency. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117590
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  • 6
    Electronic Resource
    Electronic Resource
    A simple calibration method for potassium halide thermoluminescence dosimeters (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3266-3268 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a simple calibration method for europium-doped potassium halide dosimeters. The procedure is based on the self-irradiation absorbed dose of potassium halide thermoluminescence dosimeters due to the natural content of the radionuclide 40K in potassium halide crystals. In the small dose range of the order of 0.5 mGy, the precision of the proposed method is highly competitive with traditional calibration methods, without the need of artificial radiation sources and rather expensive and sophisticated measurement equipment. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114893
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  • 7
    Electronic Resource
    Electronic Resource
    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 15-44 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; systematics ; North America ; new species ; cladistics ; fairy shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033798
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  • 8
    Electronic Resource
    Electronic Resource
    New records of large branchiopods (Branchiopoda: Anostraca, Notostraca, and Spinicaudata) in Mexico (1997)
    Springer
    Hydrobiologia 359 (1997), S. 63-69 
    Details
    ISSN: 1573-5117
    Keywords: geographical distribution ; fairy shrimp ; tadpole shrimp ; clam shrimp ; Lepidurus ; Cyclestheria ; coloration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper reports new distribution records of large branchiopods for Mexico following a three year survey of the Baja California peninsula. The occurance of the anostracans Thamnocephalus mexicanus (Linder, 1941) and T. platyurus (Packard, 1877), the notostracan Lepidurus lemmoni (Holmes, 1894), and the spinicaudatans Eulimnadia cylindrova (Belk, 1989) and E. texana (Packard,1871), all represent the first records for the peninsula. An undescribed species of the anostracan genus Streptocephalus is recorded from the state of Baja California (Norte). The occurrence of the notostracan genus Triops and four other anostracan species on the peninsula is also confirmed. The conchostracan Cyclestheria hislopi (Baird, 1859) is recorded from the state of Quintana Roo. The collections of Lepidurus and Cyclestheria are the first records for México. These records increase the number of species of large branchiopods reported fromMéxico to 36: 20 Anostraca, 3 Notostraca, 11 Spinicaudata, and 2Laevicaudata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003142332493
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  • 9
    Electronic Resource
    Electronic Resource
    Laboratory culture of fairy shirmps using baker's yeast as basic food in a flow-through system (1995)
    Springer
    Hydrobiologia 298 (1995), S. 141-157 
    Details
    ISSN: 1573-5117
    Keywords: Thamnocephalus ; Branchinecta ; growth ; filter-feeders ; feeding ; clay ; silicium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We designed and standardized a culture method for freshwater anostracans using diets free of live algae.Thamnocephalus platyurus andBranchinecta lindahli were used as test organisms. We used baker's yeast as basic food and added inert particles (clay or amorphic silicium dioxide) to improve the digestion of the yeast. A flow-through culture system was used, according to a fixed feeding schedule, to supply separately, culture medium (tap water), food, and inert particle suspensions. Three variants with baker's yeast as basic, food were compared for survival, growth, and reproduction. A diet of solely baker's yeast (diet 1) or baker's yeast supplemented with vegetal oil containing ß-carotene (diet 2) was unsuitable for reproduction ofT. platyurus. Cyst production was only achieved when diet 2 was supplemented with fish oil andSpirulina powder (diet 3). This suggests that not only a digestibility problem, but also nutritional deficiencies are present in baker's yeast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033809
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  • 10
    Electronic Resource
    Electronic Resource
    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 203-232 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; classification ; phylogeny ; fairy shrimp ; phyllopod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of the genus. Thus, our investigation consisted of (1) a review of the external morphology of the antenna, (2) biometry of selected parts of the antenna to obtain informative ratios, (3) a review of the presence or absence of genetal linguiform outgrowths, extension of the non-retractile parts of the penes, and general morphology of the cercopods, (4) a study of the location of the ovaries, and extension of the brood-pouch. On the basis of the results we classifyStreptocephalus into nine species groups. Five subgroups are identified within two of the species groups Several implications of the present approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033815
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