Biogeochemical ecology of six species of Sphagnum in Costa Rica

There is very little information on the biogeochemical ecology of Sphagnum species in tropical regions. The majority of the ecological information on Sphagnum species in the tropics consists of general habitat information and pH values that are reported in new species descriptions and regional floras such as those of Crum (1980, 1989), Crum and Buck (1988), Karlin (1991), and McQueen (1989)

Scaling and data collapse from local moments in frustrated disordered quantum spin systems

Recently measurements on various spin-1/2 quantum magnets such as H$_3$LiIr$_2$O$_6$, LiZn$_2$Mo$_3$O$_8$, ZnCu$_3$(OH)$_6$Cl$_2$ and 1T-TaS$_2$ -- all described by magnetic frustration and quenched disorder but with no other common relation -- nevertheless showed apparently universal scaling features at low temperature. In particular the heat capacity C[H,T] in temperature T and magnetic field H exhibits T/H data collapse reminiscent of scaling near a critical point. Here we propose a theory for this scaling collapse based on an emergent random-singlet regime extended to include spin-orbit coupling and antisymmetric Dzyaloshinskii-Moriya (DM) interactions. We derive the scaling $C[H,T]/T \sim H^{-\gamma} F_q[T/H]$ with $F_q[x] = x^{q}$ at small $x$, with $q \in$ (0,1,2) an integer exponent whose value depends on spatial symmetries. The agreement with experiments indicates that a fraction of spins form random valence bonds and that these are surrounded by a quantum paramagnetic phase. We also discuss distinct scaling for magnetization with a $q$-dependent subdominant term enforced by Maxwell's relations.Comment: v2. Expanded argument in Appendix 2 and revised for clarity. v3. Fixed typo in Fig 3 caption. Main text 4 pages 4 figures, Appendix 6 pages 1 figur

Using Drama to Persuade

Television ads can be classified as either arguments or dramas or hybrids of these forms. We claim that form dimension influences how ads are processed. An argument backs its claims with appeals to objectivity and is processed evaluatively. A drama appeals more to subjective criteria and is processed empathically. A study is reported in which 40 television commercials were classified on a dramatization scale. They were shown to 1,215 people, and measures of evaluative and empathic processing were taken. The measures were found to be weighted differently for arguments and dramas, supporting the contention that form influences processing

Geography and Giving: The Culture of Philanthropy in New England and the Nation

Looks at aggregate household wealth and income at the national level and for Massachusetts as a state, and analyzes levels of charitable giving in relation to household income

An accurate description of Aspergillus niger organic acid batch fermentation through dynamic metabolic modelling

Abstract Background Aspergillus niger fermentation has provided the chief source of industrial citric acid for over 50 years. Traditional strain development of this organism was achieved through random mutagenesis, but advances in genomics have enabled the development of genome-scale metabolic modelling that can be used to make predictive improvements in fermentation performance. The parent citric acid-producing strain of A. niger, ATCC 1015, has been described previously by a genome-scale metabolic model that encapsulates its response to ambient pH. Here, we report the development of a novel double optimisation modelling approach that generates time-dependent citric acid fermentation using dynamic flux balance analysis. Results The output from this model shows a good match with empirical fermentation data. Our studies suggest that citric acid production commences upon a switch to phosphate-limited growth and this is validated by fitting to empirical data, which confirms the diauxic growth behaviour and the role of phosphate storage as polyphosphate. Conclusions The calibrated time-course model reflects observed metabolic events and generates reliable in silico data for industrially relevant fermentative time series, and for the behaviour of engineered strains suggesting that our approach can be used as a powerful tool for predictive metabolic engineering

A Methodology for Evaluating Whether Web Sites Support Their Organizational Critical Activities

Organizational critical activities (OCAs) are activities which must receive constant management attention in order for that organization to be successful in its industry. Some empirical studies have shown that all of these activities may not be well supported by organizations’ websites. This research attempts to develop the evaluation methodology which can be used to assess how well an organization’s website supports the organization’s OCAs if the OCAs are identified. Based on a review of relevant literature, a prototype was proposed, and then evolved and tested through eight case studies in New Zealand universities. In total, more than two thousands web pages were evaluated and 37 semi-structured interviews were conducted. The final methodology includes five operational stages and seven forms. The results of final case were presented in order to show how the methodology can be utilized in the website evaluation. Some implications and future research are also provided