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  • 1
    Publication Date: 2019-07-13
    Description: Highly promising locales for biosignature prospecting on Mars are ancient hydrothermal deposits, formed by the interaction of surface water with heat from volcanism or impacts. On Earth, they occur throughout the geological record (to at least approx. 3.5 Ga), preserving robust mineralogical, textural and compositional evidence of thermophilic microbial activity. Hydrothermal systems were likely present early in Mars' history, including at two of the three finalist candidate landing sites for M2020, Columbia Hills and NE Syrtis Major. Hydrothermal environments on Earth's surface are varied, constituting subaerial hot spring aprons, mounds and fumaroles; shallow to deep-sea hydrothermal vents (black and white smokers); and vent mounds and hot-spring discharges in lacustrine and fluvial settings. Biological information can be preserved by rapid, spring-sourced mineral precipitation, but also could be altered or destroyed by postdepositional events. Thus, field observations need to be followed by detailed laboratory analysis to verify potential biosignatures. See Attachment
    Keywords: Space Sciences (General)
    Type: JSC-E-DAA-TN52589 , International Mars Sample Return Conference; Apr 25, 2018 - Apr 27, 2018; Berlin; Germany
    Format: application/pdf
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  • 2
    Publication Date: 2016-02-12
    Description: Marine ecosystems at high latitudes are characterized by extreme seasonal changes in light conditions, as well as a limited period of high primary production during spring and early summer. As light returns at the end of winter to Arctic ice-covered seas, a first algal bloom takes place in the bottom layer of the sea ice. This bottom ice algae community develops through three distinct phases in the transition from winter to spring, starting with phase I, a predominantly net heterotroph community that has limited interaction with the pelagic or benthic realms. Phase II begins in the spring once light for photosynthesis becomes available at the ice bottom, although interaction with the water column and benthos remains limited. The transition to the final phase III is then mainly driven by a balance of atmospheric and oceanographic forcing that induce structural changes in the sea ice and ultimately the removal of algal biomass from the ice. Due to limited data availability an incomplete understanding exists of all the processes determining ice algal bloom phenology and the considerable geographic differences in sympagic algal standing stocks and primary production. We present here the first pan-Arctic compilation of available time-series data on vernal sea ice algal bloom development and identify the most important factors controlling its development and termination. Using data from the area surrounding Resolute Bay (Nunavut, Canada) as an example, we support previous investigations that snow cover on top of the ice influences sea ice algal phenology, with highest biomass development, but also earliest termination of blooms, under low snow cover. We also provide a pan-Arctic overview of sea ice algae standing stocks and primary production, and discuss the pertinent processes behind the geographic differences we observed. Finally, we assess potential future changes in vernal algal bloom phenology as a consequence of climate change, including their importance to different groups of grazers.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 4
    Publication Date: 2021-05-19
    Description: The Tana River drains the southern and eastern slopes of Mount Kenya and the eastern slopes of the Aberdares, and is the largest river in Kenya. It passes through most of Kenya's agro-climatic zones (Sombroek et al, 1980) from zone 1-9 (humid and cold) on Mount Kenya and the Aberdares, to VII-1 (very arid and very hot) over much of the lower Tana. The river has received little ecological attention especially in the Kora region and consequently knowledge of the fish fauna is poor. This scarcity of information is largely due to the lack of economic incentives for development and the inaccessibility of much of this region where road communications are difficult and at times impossible. The upper reaches of the Tana, above about 1500m, were examined by van Someren (1952) and notes on the fishes in the middle reaches have been made by copley (1958), Whitehead (1959) made a collection of fishes on the lower Tana River below Garissa. Following this, a single collection has been made, by the Fisheries Department, Kenya, (Oduol, 1976) from six localities on the lower Tana River below Kora.
    Description: Campbell, K., C. Coe and M. Saunders, 1985. A survey of fishes of the Tana River at Koba and a checklist of fishes of the Tana River. p. 175-188. In M. Coe and N.M. Collins (eds.) Kora. An ecological inventory of the Kora National Reserve, Kenya. Royal Geographical Society, London, 380pp.
    Description: Published
    Keywords: Check lists ; Fishery resources ; Fishery surveys ; River fisheries
    Repository Name: AquaDocs
    Type: Book Section , Not Known
    Format: pp.175-188
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 11 (1946), S. 803-811 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 24 (1952), S. 1232-1232 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1723-1728 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 35 (2000), S. 48-62 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Twenty nine samples of silica sinter, ranging in age from modern to Miocene, record temporal changes in both mineralogy and texture. When first deposited, sinters consist largely of noncrystalline spheres (〈1–8 μm diameter) of opal-A exhibiting varying degrees of close-packing. Particle densities range from 1.5 to 2.1 g cm−3, total water 4–10 wt%, and porosities 35–60%. Changes over ∼10,000 years following deposition are slight although the spheres may be invested by an additional film of secondary silica. For the next 10,000 to ∼50,000 years, the silica incrementally crystallises to become poorly crystalline opal-CT and/or opal-C; spherical particles of thin-bladed crystals (lepispheres) replace opal-A particles and coalesce in microbotryoidal aggregates (∼10–30 μm diameter). Amygdaloidal fibrous clusters occur with lepispheres. As silica lattice ordering becomes enhanced, total water content drops to 〈7 wt%, particle density increases to ∼2.3 g cm−3, and porosity reduces to 〈30%. The change from opal-A to opal-C takes place over a briefer periods (∼50 years) in silica sinters that contain other materials (e.g. calcite, sulfur, alunite, plant remains). Sinters older than ∼50,000 years have recrystallised to microcrystalline quartz. With the onset of quartz crystallisation at ∼20,000 years, total water is 〈0.2 wt%, particle density approximates quartz (2.65 g cm−3), and porosity is 〈4%. The progressive changes in silica species and texture yield ageing profiles for sinters that may serve as guides to the paleohydrology of geothermal systems and/or epithermal ore deposits in areas where surface thermal activity has declined or ceased.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    International journal of selection and assessment 8 (2000), S. 0 
    ISSN: 1468-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Two studies are reported which compare more and less successful account officers (debt collectors) in terms of their emotional intelligence, measured using the BarOn Emotional Quotient Inventory. The findings support the view that higher levels of emotional intelligence lead to enhanced job performance. Implications for selection are considered in the conclusion.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 46 (1981), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Utility chucks and Choice plates were coarse ground and mixed to provide raw material with a fat content of about 20%. Four 23 kg meat blocks were assigned, at random, to treatments: (1) control, (2) salt, (3) tripolyphosphate (TPP), and (4) salt and TPP. Each treatment was flaked, blended, and hand formed into logs which were PVC wrapped, freeze-tempered, pressed, and sliced to a 12 mm thickness. Patties were freezer wrapped and stored for evaluation initially (time) and after 30 and 60 days storage. The entire experiment was replicated three times. Sensory evaluation showed that cohesiveness, flavor, and juiciness of patties containing salt (treatments 2 and 4) were more desirable (p〈0.01) than the control or TPP treatments. Differences over the storage period were not significant. Instron values were lower for the control patties than other treatment groups. Patties stored 60 days had higher (P〈0.05) TBA values than those evaluated initially or after 30 days of freezer storage.
    Type of Medium: Electronic Resource
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