633 research outputs found
The crystal structure of aziridine
No full textMitzel NW, Riede J, Kiener C. The crystal structure of aziridine. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1997;36(20):2215-2216
A New Convenient Synthesis for 2-Trifluoromethyl Substituted Aspartic Acid and its Isopeptides
No full textSewald N, Riede J, Bissinger P, Burger K. A New Convenient Synthesis for 2-Trifluoromethyl Substituted Aspartic Acid and its Isopeptides. J. Chem. Soc., Perkin Trans. 1. 1992;(2):267-274
1,4-dibromo-1,4-disilabutane
No full textMitzel NW, Riede J, Schmidbaur H. 1,4-dibromo-1,4-disilabutane. ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS. 1996;52(4):980-982.Molecules of the title compound, C2H8Br2Si2, have a crystallographic centre of inversion. The Si-C-C-Si unit is thus planar and has a trans conformation. The B-Si-C-C moieties have almost ideal gauche conformations with Si-Br bond lengths of 2.2362 (12) Angstrom
TRIS(P-TOLYLSILYL)AMINE
No full textMitzel NW, RIEDE J, SCHIER A, SCHMIDBAUR H. TRIS(P-TOLYLSILYL)AMINE. ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS. 1995;51(4):756-758.The title compound, C21H27NSi3, shows a virtually planar coordination geometry of the N atom. Unlike in (PhH(2)Si)(3)N, the three p-tolylsilyl substituents are not related by crystallographic symmetry
Zum Cycloadditionsverhalten von 5-Azido-4-trifluormethyl-1,3-azolen
No full textBurger K, Höß E, Geith K, Riede J, Bissinger P, Sewald N. Zum Cycloadditionsverhalten von 5-Azido-4-trifluormethyl-1,3-azolen. Z. Naturforsch. B: Chem. Sci. 1990;45(12):1695-1708
1,1,1,4,4,4-Hexachloro-1,4-disilabutane
No full textMitzel NW, Riede J, Schmidbaur H. 1,1,1,4,4,4-Hexachloro-1,4-disilabutane. ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS. 1997;53(9):1335-1337.Molecules of the title compound, C2H4Cl6Si2, have a crystallographic centre of inversion and adopt a trans conformation in the crystal. Important bond lengths are C-C 1.536 (3), Si-C 1.8469 (15), and Si-Cl 2.0229 (6), 2.0225 (6) and 2.0283 (6) Angstrom. The Cl atom trans to the C-C bond is tilted towards the C atom. There are no important intermolecular interactions
SOLID-STATE STRUCTURE OF N,N-DIBENZYLHYDROXYLAMINE
No full textMitzel NW, RIEDE J, ANGERMAIER K, SCHMIDBAUR H. SOLID-STATE STRUCTURE OF N,N-DIBENZYLHYDROXYLAMINE. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES. 1995;50(4):699-701.The solid-state structure of N,N-dibenzylhydroxylamine (1) has been determined by single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P2(1)/n with four formula units in the unit cell. N,N-dibenzylhydroxylamine dimerizes to give N2O2H2 six-membered rings as a result of the formation of two hydrogen bends O-H ... N in the solid state
Towards a new social contract for archaeology and climate change adaptation
No full textAnthropogenic climate change is one of the greatest challenges facing society in the twenty-first century. Climate impacts present wicked and messy challenges that require a cross-disciplinary understanding of social and biophysical change (Tengö et al. 2010). There is a growing body of evidence that climate change will have impacts on food production (Barrett 2010), global health (Watts et al. 2015, 2017), the frequency of hazardous events (IPCC 2014), resource conflict (Barnett and Adger 2007) and the displacement of people (Adger et al. 2013a; Bettini 2013, 2017). Curiously, archaeology, a subject with a long history of studying human-environment interactions, plays a very limited role in contemporary debates about appropriate responses to climate challenges (Costanzo et al. 2007; Dearing et al. 2006; Van de Noort 2013). This paper develops recent calls for archaeology to more actively participate in contemporary climate-adaptation research, public education and community empowerment (Riede 2014a; Riede et al. 2016a; Van de Noort 2013). Firstly, we outline the ways in which long-term perspectives of human interactions with changing climates (and thus archaeology) can contribute to global change research (GCR). Secondly, we outline the idea of a ‘social contract’ in archaeology as a way to enhance GCR. This ‘social contract’ would: (i) encourage interdisciplinary publications that synthesize archaeological research focusing on evidence of the long-term impacts of climate change on human societies; (ii) encourage museums to engage the public with thematic exhibitions that outline impacts of climate change on cultures in the past in ways that make explicit connections to contemporary debates; and, (iii) encourage transdisciplinary projects that better engage the physical sciences with the social sciences and the humanities, as well as with the academy and civil society
Steps towards operationalizing an evolutionary archaeological definition of culture
No full textThis paper will examine the definition of archaeological cultures/techno-complexes from an evolutionary perspective, in which culture is defined as a system of social information transmission. A formal methodology will be presented through which the concept of a culture can be operationalized, at least within this approach. It has already been argued that in order to study material culture evolution in a manner similar to how palaeontologists study biological change over time we need explicitly constructed ‘archaeological taxonomic units’ (ATUs). In palaeontology, the definition of such taxonomic units – most commonly species – is highly controversial, so no readily adoptable methodology exists. Here it is argued that ‘culture’, however defined, is a phenomenon that emerges through the actions of individuals. In order to identify ‘cultures’, we must therefore construct them from the bottom up, beginning with individual actions. Chaîne opèratoire research, combined with the formal and quantitative identification of variability in individual material culture behaviour allows those traits critical in the social transmission of cultural information to be identified. Once such traits are identified, quantitative, so-called phylogenetic methods can be used to track material culture change over time. Phylogenetic methods produce nested hierarchies of increasingly exclusive groupings, reflecting descent with modification within lineages of social information transmission. Once such nested hierarchies are constructed, it is possible to define an archaeological culture at any given point in this hierarchy, depending on the scale of analysis. A brief example from the Late Glacial in Southern Scandinavia is presented and it is shown that this approach can be used to operationalize an evolutionary definition of ‘culture’ and that it improves upon traditional, typologically defined technocomplexes. In closing, the benefits and limits of such an evolutionary and quantitative definition of ‘culture’ are discussed
Figure 2, Panel D: Response of white-tailed deer females to infant distress vocalizations and selected control stimuli.
No full textData in this file represent the response of white-tailed deer females (fig 2, D) to infant distress vocalizations of diverse mammalian species and selected control stimuli.
Data columns include:
Column A: Species & call type: This column includes the species name and the type of stimulus including unmanipulated (UM) distress calls, F0-shifted distress calls (F0S, F0 manipulated by multiplying F0 by a certain factor), RS distress calls (distress calls with the F0 manipulated by overriding the sampling frequency) and certain control stimuli (meadowlark song).
Column B. Individual: This column lists the identity of the animal producing the sound stimulus.
Column C. Mean F0: The mean fundamental frequency (mean F0) of the call in Hz.
Column D. Jitter: due to overlapping values, it was necessary to jitter the data on the x-axis so that the overlapping calls would be visible in figure 2. This column shows the specific extent to which values were jittered. Data are represented on a log scale, making it necessary to apply a larger numerical ‘jitter’ when the mean F0 was higher. Values were not jittered on the y-axis.
Column E. Mean F0 jittered (x): Mean F0 in Hz once jitter is taken into account. This column shows data for the x-axis.
Column G. Female response (y): This column shows data for the y-axis. See corresponding publication for details on the response scale.
For WT (white-tailed deer) 0.2 to 2.0-F0S entries (see Column A), median values for female responses to manipulated white-tailed deer calls were obtained from Teichroeb, L. J., T. Riede, R. Kotrba, and S. Lingle. 2013. Fundamental frequency is key to response of female deer to juvenile distress calls. Behavioural Processes 92:15– 23
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