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  • 1
    Monograph available for loan
    Monograph available for loan
    Geotechnologien : das System Erde: vom Prozeßverständnis zum Erdmanagement (2003)
    Potsdam : Geoforschungszentrum
    Details Availability
    Call number: 4/M 05.0119
    Type of Medium: Monograph available for loan
    Pages: XIV, 130 S.
    Edition: 3. veränd. Aufl.
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Orchestration of floral initiation by APETALA1 (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-04-03
    Description: The MADS-domain transcription factor APETALA1 (AP1) is a key regulator of Arabidopsis flower development. To understand the molecular mechanisms underlying AP1 function, we identified its target genes during floral initiation using a combination of gene expression profiling and genome-wide binding studies. Many of its targets encode transcriptional regulators, including known floral repressors. The latter genes are down-regulated by AP1, suggesting that it initiates floral development by abrogating the inhibitory effects of these genes. Although AP1 acts predominantly as a transcriptional repressor during the earliest stages of flower development, at more advanced stages it also activates regulatory genes required for floral organ formation, indicating a dynamic mode of action. Our results further imply that AP1 orchestrates floral initiation by integrating growth, patterning, and hormonal pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaufmann, Kerstin -- Wellmer, Frank -- Muino, Jose M -- Ferrier, Thilia -- Wuest, Samuel E -- Kumar, Vijaya -- Serrano-Mislata, Antonio -- Madueno, Francisco -- Krajewski, Pawel -- Meyerowitz, Elliot M -- Angenent, Gerco C -- Riechmann, Jose Luis -- New York, N.Y. -- Science. 2010 Apr 2;328(5974):85-9. doi: 10.1126/science.1185244.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Business Unit Bioscience, Plant Research International, Wageningen 6700 AA, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20360106" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/*genetics/*growth & development/metabolism ; Arabidopsis Proteins/genetics/*metabolism ; Binding Sites ; Chromatin Immunoprecipitation ; Down-Regulation ; Flowers/*growth & development ; Gene Expression Profiling ; *Gene Expression Regulation, Plant ; Genes, Plant ; Genome, Plant ; Homeodomain Proteins/genetics/metabolism ; MADS Domain Proteins/genetics/*metabolism ; Oligonucleotide Array Sequence Analysis ; Transcription Factors/genetics/*metabolism ; Transcription Initiation Site ; *Transcription, Genetic ; Transcriptional Activation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous 13 C depletion in early Precambrian graphites from Superior Province, Canada (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 696-699 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some 35% of the Precambrian graphite samples measured have 13C concentrations which lie outside the Phanerozoic range. Enrichment has usually been explained by the preferential loss of 12C during metamorphism1-4, but depletion is harder to account for. It has been suggested that depletion may be a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290696a0
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalous 13 C depletion in Precambrian organic carbon (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 172-172 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SCHOELL AND WELLMER REPLY- Towe has raised some often repeated questions which, however, are not directly relevant to our paper. We aimed to explain why some Precambrian graphites are depleted in 13C compared with the bulk of all other Precambrian graphites. We offered an explanation by suggesting ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295172a0
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  • 5
    Electronic Resource
    Electronic Resource
    Unconventional PGE occurrences and PGE mineralization in the Great Dyke: metallogenic and economic aspects (2000)
    Springer
    Mineralium deposita 35 (2000), S. 260-280 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Platinum group elements (PGE) are strategic materials because 96–99% of the world production is derived from just five mining districts and because they cannot be replaced as catalysts in many chemical processes. In order to lessen the strategic character of PGE, both conventional deposits and unconventional PGE mineralizations were investigated in an attempt to locate viable deposits which would diversify the supplier base. In the Great Dyke, conventional PGE mineralization occurs in the form of pristine sulfide ores mined underground and oxidic surface ores. New observations such as bimodal distributions of the PGE in the Main Sulfide Zone (MSZ), elevated Pt/Pd ratios in the oxidized MSZ compared to the sulfidic part and distinct differences between the platinum group mineral (PGM) assemblages of the MSZ and stream sediments of adjacent rivers emphasize the fact that even though the Great Dyke seems to be the second or third largest PGE occurrence in the world, the complicated PGE distributions and supergene redistributions should be kept in mind during planning and mine operation. Investigations of unconventional PGE occurrences in ophiolites, Alaskan-type intrusions, porphyry copper deposits and in the Kupferschiefer show that economically exploitable PGE concentrations can be expected in a broader variety of host rocks than considered favourable in the past. In the Albanian Mirdita ophiolite average contents of 860 ppb Pt and 60 ppb Pd were detected. Flotation concentrates of porphyry copper deposits, for example from Mamut, Malaysia, Santo Tomas, Philippines, Elacite, Bulgaria, and Ok Tedi, Papua New Guinea, contain between 827 and 1860 ppb Pd + Pt. In selected profiles of the Polish Kupferschiefer average contents of 255 ppb Pt, 94 ppb Pd, 2.4 ppm Au and 13.0 ppm Ag were analysed. The distribution of the PGE resources in the world and the annual production rates, however, underline the fact that the chances for a significant change in the supplier base are relatively low. The Bushveld Complex will remain the largest producer, followed by Noril'sk-Talnakh, Sudbury and Stillwater. If the operations in the Great Dyke reach their planned capacities, the Great Dyke will rank in third place among the PGE-producing deposits in the world.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050019
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  • 6
    Electronic Resource
    Electronic Resource
    Statistical and geostatistical methods applied to the exploration work of the Nanisivik Zn-Pb mine, Baffin Island, Canada (1980)
    Springer
    Mathematical geology 12 (1980), S. 321-337 
    Details
    ISSN: 1573-8868
    Keywords: geostatistics ; kriging ; variogram analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The Nanisivik Pb-Zn deposit at Strathcona Sound, northern Baffin Island, Canada, is an orebody that is an S-shaped lens 3000 m long, 75 m wide, and 2–20 m thick. It is an epigenetic karst channel filling. Total reserves are 6.9 million short tons of 14.12% Zn, 1.4% Pb, and 1.77 oz of Ag per ton. The mine was brought into production in 1976 at a rate of 2000 short tons per day. In the preproduction phase variogram studies based only on surface holes indicated a random distribution. For the evaluation of grades and for the determination of the confidence limits, classic statistical procedures were applied. Since the drilling density was different in different ore zones, a model was developed to test the effect of different drill hole spacings on the uncertainties in the present value in a discounted cash flow model. After the initial development and mining stage, structures could be recognized in semivariograms. Studies for a best drilling grid showed that the pattern of 25 ×20 m used in the mine could be extended to 35 ×35 m, taking into account that eight stopes are mined simultaneously. For ore reserve calculations weighing factors were calculated by kriging for six universally applicable geometric situations. Only the drill holes within a block and immediately surrounding it were taken into account. A test in a well-known zone yielded satisfactory results. A test to predict highs and lows of the grade accurately enough to optimally place the pillars failed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029419
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  • 7
    Electronic Resource
    Electronic Resource
    An approximation method for evaluation of the third-rank piezoelectric tensor of the symmetry 3:2 and its application in petrofabric studies (1971)
    Springer
    Mathematical geology 3 (1971), S. 375-378 
    Details
    ISSN: 1573-8868
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02083359
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  • 8
    Electronic Resource
    Electronic Resource
    Factors useful for predicting future mineral-commodity supply trends (1997)
    Springer
    Geologische Rundschau 86 (1997), S. 311-321 
    Details
    ISSN: 0016-7835
    Keywords: Key words Mineral commodity trends ; Mineral commodity supply ; Mineral commodity demand ; Mineral commodity market ; Reserves ; Resources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The analysis of various factors influencing mineral availability documents future short-and long-term mineral-commodity supply trends. The lifetime of reserves, the development of the relative importance of production centres and the forecasting of the depletion of a resource base are mainly geological factors, although the category “reserves”, in contrast to “resources”, is determined by technical and economical aspects. These three factors govern the short-and long-term supply of mineral commodities. The intensity-of-use factors and the growth rate of consumption are variables related to the demand of mineral commodities. They influence the decision of companies for certain commodities as targets for exploration and investment in production centres. Both factors control the short-to medium-term mineral supply. Finally, the lead time to production is a technical variable, although influenced by ore deposit type, and controls short-term mineral availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050142
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  • 9
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    Molecular basis for the specification of floral organs by APETALA3 and PISTILLATA (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-07-30
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Post-embryonic Hourglass Patterns Mark Ontogenetic Transitions in Plant Development (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-22
    Description: The historic developmental hourglass concept depicts the convergence of animal embryos to a common form during the phylotypic period. Recently, it has been shown that a transcriptomic hourglass is associated with this morphological pattern, consistent with the idea of underlying selective constraints due to intense molecular interactions during body plan establishment. Although plants do not exhibit a morphological hourglass during embryogenesis, a transcriptomic hourglass has nevertheless been identified in the model plant Arabidopsis thaliana . Here, we investigated whether plant hourglass patterns are also found postembryonically. We found that the two main phase changes during the life cycle of Arabidopsis , from embryonic to vegetative and from vegetative to reproductive development, are associated with transcriptomic hourglass patterns. In contrast, flower development, a process dominated by organ formation, is not. This suggests that plant hourglass patterns are decoupled from organogenesis and body plan establishment. Instead, they may reflect general transitions through organizational checkpoints.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
    Published by Oxford University Press
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