bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Simulation of Copan Populatin History and its Implications
Authors: Webster David , Sanders William T. , van Rossum Peter 
Published: December 2011

AbstractSeveral projects carried out at Copan since 1975 provide extensive settlement data that form the basis for a simulation of Copan population history between A.D. 400–1250. Most important is a set of 2,048 obsidian hydration dates, associated with 15% of all known sites, that allows unprecedented chronological control of occupational episodes at domestic sites of all social ranks. This article summarizes the results of our simulation, and some of its implications for agricultural intensification, sociopolitical structure, and labor demand for elite construction projects.
ANCIENT MAYA MOSAIC MIRRORS: FUNCTION, SYMBOLISM, AND MEANING
Authors: Healy Paul F. , Blainey Marc G. 
Published: December 2011

AbstractThis paper examines the composite lithic artifacts of the ancient Maya commonly termed “mirrors.” Typically flat, shiny objects with polished iron-ore polygons fitted in a mosaic pattern onto a slate backing, we assess these plaques for the technological, spatiotemporal, and functional contexts of their manufacture. Data from over 500 archaeological specimens, from dozens of Maya sites in Mexico, Guatemala, Belize and Honduras, were examined as part of this study. We also consider the iconography, epigraphy, and possible symbolism of these curious artifacts. Based on this analysis, we conclude that ancient Maya mosaic mirrors were employed in rituals, often by elite individuals, as both symbols of authority but also, importantly, as possible mystical devices for divinatory “scrying.” They were highly valued, often beautifully made, reflective ceremonial objects whose possible use for prognostication in shamanic rites likely has great antiquity in Mesoamerica.
OBJECT, MEMORY, AND MATERIALITY AT YAXCHILAN: THE RESET LINTELS OF STRUCTURES 12 AND 22
Authors: O'Neil Megan E. 
Published: December 2011

AbstractThis article focuses on Structures 12 and 22 from Yaxchilan (Chiapas, Mexico), where the ancient Maya reset stone lintels from the sixth centurya.d.in eighth-century buildings. The resetting highlights attention to the preservation of the lintels as relics from the past. Valued for their antiquity and the histories they had accrued, particularly from contact with ancestors, they served as loci for communication with the past, with memory inhering in their materiality. This essay also explores the lintels’ physical contexts and how the Maya may have engaged with them. For example, the arrangement of the Structure 12 lintels would have guided circumambulation. Such movement was associated with sacred processions, and evidence suggests the building was reserved for ancestor veneration. Although only restricted groups could have entered the small structure to perform rites, these may have been integrated into extended ceremonial circuits in public spaces.This article connects with studies of the life histories of things, in which analysis is directed toward objects’ use, reuse, and modification. Examining how people interacted with sculptures over time offers insight into the people and the objects and provides glimpses into Late Classic Maya perception of sculptures and their material qualities.
THE CONSTRUCTION OF MEMORY: THE USE OF CLASSIC PERIOD DIVINATORY TEXTS IN THE LATE POSTCLASSIC MAYA CODICES
Authors: Vail Gabrielle , Hernández Christine 
Published: December 2011

AbstractMaya codices were important repositories of cultural knowledge and traditions passed down through the centuries. Rather than being focused on human actors, however, the Late Postclassic period Maya screenfolds contain almanacs that predict the movements of celestial bodies during earlier time periods. The purpose of these seemingly “out-of-date” tools was to predict the future based on notions of cyclical time. Recent research suggests that centuries-old astronomical almanacs do more than model the past or formulate rituals. Instead, they are formulated to integrate celestial events with other cycles of time and to contextualize them with events from the mythic past, such as the destruction of a former world by flood. The memory of this calamitous primordial event, framed in terms of astronomical and seasonal cycles, is preserved in pre-Hispanic and historic documents as a means of conveying the ill-fortune associated with like-in-kind events that are certain to repeat, and of scheduling the performance of appropriate ritual actions to mitigate their destructive potential.
EL REINADO DE AXAYACATL Y LA CREACIÓN DEL ESTILO TENOCHCA DEL TRABAJO DE LA CONCHA
Authors: Velázquez-Castro Adrián 
Published: December 2011

AbstractRecientemente, en el Museo del Templo Mayor se ha llevado a cabo un proyecto de investigación uno de cuyos principales objetivo es el conocimiento de las tradiciones tecnológicas del trabajo de las conchas de moluscos, que se desarrollaron en diferentes sitios y regiones del México prehispánico. En el presente trabajo se presentan los resultados de los análisis tecnológicos de cinco colecciones de piezas conquiliológicas que comprenden más de 2,000 años de la historia del centro de México, desde el preclásico temprano hasta la conquista europea (1250 a.C.–1521 d.C.). Se identifican rasgos que son comunes y que evidencian la existencia de una memoria colectiva de larga duración en la elaboración de objetos de concha, así como elementos que son particulares y en los que pueden observarse rupturas o cambios. En este sentido resultan particularmente interesantes las producciones que se elaboran en Tenochtitlan a partir del reinado del gobernante Axayacatl, ya que ciertos materiales y herramientas de uso común en épocas anteriores en el altiplano central de México son olvidados, quizás para la conciente creación de un estilo tecnológico propio de la capital del recientemente consolidado imperio azteca.
Subjective effects of antipsychotic drugs and their relevance for compliance and remission
Authors: Naber Dieter 
Published: January 2012

AbstractOnly recently, success criteria became more ambitious and include a more thorough consideration of negative symptoms and cognitive dysfunction. The most important change within the last decade is the long overdue consideration of the patient's perspective. His/her subjective well-being, often unchanged or even worsened by typical antipsychotics, was neglected for a long time. One reason was the prejudice that schizophrenic patients are not able to self-rate their quality of life. Another reason was the belief that such data are not necessary because the psychiatrists' perspective, “objective” psychopathology, includes these domains. Among other scales, a self-report instrument has been constructed to evaluate “subjective well-being under neuroleptics” (SWN). This scale was used in numerous open and controlled trials, indicating: a) patients, if no longer acutely psychotic or suffering from severe cognitive deficits, are able to reliably assess their subjective well-being, b) high SWN is correlated with high compliance, c) atypical antipsychotics increase SWN, and d) individual improvements of SWN and of PANSS are not strongly related. Moreover, several studies found that early improvement of subjective well-being is a major predictor for the chance of remission. All these data indicate that a better consideration of the patient's perspective is possible and necessary.
Improving the Accuracy and Precision of Cognitive Testing in Mild Dementia
Authors: Wouters Hans , Appels Bregje , van der Flier Wiesje M. , van Campen Jos , Klein Martin , Zwinderman Aeilko H. , Schmand Ben , van Gool Willem A. , Scheltens Philip , Lindeboom Robert 
Published: December 2011

AbstractThe CAMCOG, ADAS-cog, and MMSE, designed to grade global cognitive ability in dementia have inadequate precision and accuracy in distinguishing mild dementia from normal ageing. Adding neuropsychological tests to their scale might improve precision and accuracy in mild dementia. We, therefore, pooled neuropsychological test-batteries from two memory clinics (ns = 135 and 186) with CAMCOG data from a population study and 2 memory clinics (n = 829) and ADAS-cog data from 3 randomized controlled trials (n = 713) to estimate a common dimension of global cognitive ability using Rasch analysis. Item difficulties and individuals’ global cognitive ability levels were estimated. Difficulties of 57 items (of 64) could be validly estimated. Neuropsychological tests were more difficult than the CAMCOG, ADAS-cog, and MMSE items. Most neuropsychological tests had difficulties in the ability range of normal ageing to mild dementia. Higher than average ability levels were more precisely measured when neuropsychological tests were added to the MMSE than when these were measured with the MMSE alone. Diagnostic accuracy in mild dementia was consistently better after adding neuropsychological tests to the MMSE. We conclude that extending dementia specific instruments with neuropsychological tests improves measurement precision and accuracy of cognitive impairment in mild dementia. (JINS, 2012, 18, 314–322)
Latitudinal variation and distribution of photoperiod and temperature sensitivity for flowering in the world collection of pearl millet germplasm at ICRISAT genebank
Authors: Upadhyaya H. D. , Reddy K. N. , Irshad Ahmed Mohd , Dronavalli Naresh , Gowda C. L. L. 
Published: January 2012

The ICRISAT genebank, Patancheru, India holds 22,211 pearl millet germplasm accessions from 50 countries, including 19,063 landraces. Among these, 15,904 landraces that were geo-referenced are either thermo-sensitive (52.5%), or photoperiod-sensitive (45.6%), or insensitive to both temperature and photoperiod (2%). Latitude ranges of 10–15°N with 39.6% and 15–20°S with 13.1% of total accessions are the important regions for pearl millet germplasm. A study on climate data of the germplasm collection sites revealed that most accessions from latitudes ranging from 10 to 20° on both sides of the equator were highly sensitive to longer photoperiod (>12.5 h) and/or lower temperature ( < 12°C). Accessions that originated in locations at higher latitudes (>20–35°) on both the hemispheres exhibited low sensitivity to both photoperiod and low temperature, as they were exposed to such climates during their evolution. The accessions that are insensitive to both photoperiod and temperature were few but they originated from locations spread across all latitudes, although the highest numbers were from mid-latitudes (15–20°) in both hemispheres. As germplasm accessions are sensitive to climatic variables such as temperature and photoperiod, recording of location-specific geo-reference data while collecting the germplasm, which can help to elucidate the sensitivity of accessions to temperature and photoperiod, is emphasized. Critical evaluation of photoperiod-sensitive accessions that are late flowering for forage production and the photoperiod-insensitive early-maturing accessions for grain production, multiple cropping and development of parental lines with synchronized flowering for the development of hybrids is suggested.
A single-cell view of ammonium assimilation in coral–dinoflagellate symbiosis
Authors: Pernice Mathieu , Meibom Anders , Van Den Heuvel Annamieke , Kopp Christophe , Domart-Coulon Isabelle , Hoegh-Guldberg Ove , Dove Sophie 
Published: January 2012

Abstract
Assimilation of inorganic nitrogen from nutrient-poor tropical seas is an essential challenge for the endosymbiosis between reef-building corals and dinoflagellates. Despite the clear evidence that reef-building corals can use ammonium as inorganic nitrogen source, the dynamics and precise roles of host and symbionts in this fundamental process remain unclear. Here, we combine high spatial resolution ion microprobe imaging (NanoSIMS) and pulse-chase isotopic labeling in order to track the dynamics of ammonium incorporation within the intact symbiosis between the reef-building coral Acropora aspera and its dinoflagellate symbionts. We demonstrate that both dinoflagellate and animal cells have the capacity to rapidly fix nitrogen from seawater enriched in ammonium (in less than one hour). Further, by establishing the relative strengths of the capability to assimilate nitrogen for each cell compartment, we infer that dinoflagellate symbionts can fix 14 to 23 times more nitrogen than their coral host cells in response to a sudden pulse of ammonium-enriched seawater. Given the importance of nitrogen in cell maintenance, growth and functioning, the capability to fix ammonium from seawater into the symbiotic system may be a key component of coral nutrition. Interestingly, this metabolic response appears to be triggered rapidly by episodic nitrogen availability. The methods and results presented in this study open up for the exploration of dynamics and spatial patterns associated with metabolic activities and nutritional interactions in a multitude of organisms that live in symbiotic relationships.
Activated plasma coagulation β-Factor XII-induced vasoconstriction in rats
Authors: Papageorgiou Peter C. , Yeo Erik L. , Backx Peter H. , Floras John S. 
Published: January 2012

By inducing BK (bradykinin)-stimulated adrenomedullary catecholamine release, bolus injection of the β-fragment of activated plasma coagulation Factor XII (β-FXIIa) transiently elevates BP (blood pressure) and HR (heart rate) of anaesthetized, vagotomized, ganglion-blocked, captopril-treated bioassay rats. We hypothesized that intravenous infusion of β-FXIIa into intact untreated rats would elicit a qualitatively similar vasoconstrictor response. BN (Brown Norway) rats received for 60 min either: (i) saline (control; n=10); (ii) β-FXIIa (85 ng/min per kg of body weight; n=9); or (iii) β-FXIIa after 2ADX (bilateral adrenalectomy; n=9). LV (left ventricular) volume and aortic BP were recorded before (30 min baseline), during (60 min) and after (30 min recovery) the infusion. TPR (total peripheral resistance) was derived from MAP (mean arterial pressure), SV (stroke volume) and HR. Saline had no haemodynamic effects. β-FXIIa infusion increased its plasma concentration 3-fold in both groups. In adrenally intact rats, β-FXIIa infusion increased MAP by 6% (5±2 mmHg) and TPR by 45% (0.50±0.12 mmHg/ml per min), despite falls in SV (−38±8 μl) and HR [−18±5 b.p.m. (beats/min)] (all P&lt;0.05). In 2ADX rats, β-FXIIa had no HR effect, but decreased SV (−89±9 μl) and MAP (−4±1 mmHg), and increased TPR by 66% (0.59±0.15 mmHg/ml per min) (all P&lt;0.05). After infusion, adrenally intact rats exhibited persistent vasoconstriction (MAP, 10±1 mmHg; TPR, 0.55±0.07 mmHg/ml per min; both P&lt;0.05), whereas in 2ADX rats, MAP remained 5±1 mmHg below baseline (P&lt;0.05) and TPR returned to baseline. End-study arterial adrenaline (epinephrine) concentrations in the three groups were 1.9±0.6, 9.8±4.1 and 0.6±0.2 nmol/l respectively. Thus, in neurally intact lightly anaesthetized untreated rats, β-FXIIa infusion induces both adrenal catecholamine-mediated and adrenally independent increases in peripheral resistance.
Crystal structures of (Mg

1-
x

,Fe

x

)SiO
3
postperovskite at high pressures
Authors: Yamanaka Takamitsu , Hirose Kei , Mao Wendy L. , Meng Yue , Ganesh P. , Shulenburger Luke , Shen Guoyin , Hemley Russell J. 
Published: January 2012

X-ray diffraction experiments on postperovskite (ppv) with compositions (Mg
0.9
Fe
0.1
)SiO
3
and (Mg
0.6
Fe
0.4
)SiO
3
at Earth core-mantle boundary pressures reveal different crystal structures. The former adopts the CaIrO
3
-type structure with space group
Cmcm
, whereas the latter crystallizes in a structure with the
Pmcm
(
Pmma
) space group. The latter has a significantly higher density (
ρ
= 6.119(1) g/cm
3
) than the former (
ρ
= 5.694(8) g/cm
3
) due to both the larger amount of iron and the smaller ionic radius of Fe
2+
as a result of an electronic spin transition observed by X-ray emission spectroscopy (XES). The smaller ionic radius for low-spin compared to high-spin Fe
2+
also leads to an ordered cation distribution in the M1 and M2 crystallographic sites of the higher density ppv structure. Rietveld structure refinement indicates that approximately 70% of the total Fe
2+
in that phase occupies the M2 site. XES results indicate a loss of 70% of the unpaired electronic spins consistent with a low spin M2 site and high spin M1 site. First-principles calculations of the magnetic ordering confirm that
Pmcm
with a two-site model is energetically more favorable at high pressure, and predict that the ordered structure is anisotropic in its electrical and elastic properties. These results suggest that interpretations of seismic structure in the deep mantle need to treat a broader range of mineral structures than previously considered.
Residue Depletion of Tritium-Labeled Ivermectin in the Muscle Tissues of Aquacultured Atlantic Salmon, Tilapia, and Catfish following Oral Treatment
Authors: Shaikh Badar , Rummel Nathan , Gieseker Charles , Cheely Christie-Sue , Reimschuessel Renate 
Published: January 2012

Abstract
The residue depletion and metabolism profiles of tritium-labeled ivermectin in the muscle tissues of aquacultured Atlantic salmon Salmo salar, hybrid tilapia (Nile tilapia Oreochromis niloticus × Mozambique tilapia O. mossambicus; hereafter, “tilapia”) and channel catfish Ictalurus punctatus following oral treatment are reported. Fish were administered 3H-ivermectin at the dose level of 0.1 mg/kg of body weight (9–10 μ curies [Ci]) in a gel capsule via a stomach tube. At each postdose withdrawal time (1, 7, 14, 21, and 28 d), six fish of each species were sedated, euthanized, bled, and scaled, and fillets with adhering skin (except for catfish) were collected. The muscle fillets were homogenized in dry ice and an aliquot of each was extracted in acetonitrile followed by a high-performance liquid chromatographic analysis to determine the presence of parent ivermectin and its potential metabolites. The analysis of the muscle extracts revealed that the parent 3H-ivermectin is the major residue present for the three fish species studied. The results showed that the highest radioactive residue concentrations (ivermectin equivalents) of 21 and 6 ng/g were obtained on postdose day 1 for channel catfish and tilapia, respectively. For Atlantic salmon, the highest concentration of 14 ng/g was detected on day 7. By postdose day 21, the ivermectin radioactive residue depleted to less than 10 ng/g for all three species. No significant radioactive residue concentrations of metabolites were detected on any of the sampling days. These results suggest that parent ivermectin could serve as a marker residue to monitor its unauthorized use in Atlantic salmon, tilapia, and channel catfish.
Learning to be confident and capable journal reviewers: an Australian perspective
Authors: LU Yanping 
Published: December 2011

ABSTRACTJournal peer review has been the subject of much research. However, the learning process through which reviewers acquire their reviewing ability, and reviewers' own perceptions of their capability have rarely been a focus. This interview study asked three questions about reviewer capability and training. At what stage did you gain confidence in reviewing? How did you learn how to review? Is formal training necessary? The interview is part of a mixed‐method project studying experienced Australian reviewers. The respondents indicate that learning to review is a continuous cycle in which formal training will not work. Following a mostly self‐guided initiation, new reviewers establish personal reviewing patterns. By trial and error, the patterns are consolidated and the reviewers eventually feel ‘confident’. ‘Decisiveness' is a good sign of becoming confident. Most respondents emphasized that journals could play a crucial role in producing good reviewers, e.g. by specifying unambiguously their expectations of ‘good reviews’.
Remote Ischemic Preconditioning Applied during Isoflurane Inhalation Provides No Benefit to the Myocardium of Patients Undergoing On-pump Coronary Artery Bypass Graft Surgery
Authors: Lucchinetti Eliana , Bestmann Lukas , Feng Jianhua , Freidank Heike , Clanachan Alexander S. , Finegan Barry A. , Zaugg Michael 
Published: January 2012

Background
Two preconditioning stimuli should induce a more consistent overall cell protection. We hypothesized that remote ischemic preconditioning (RIPC, second preconditioning stimulus) applied during isoflurane inhalation (first preconditioning stimulus) would provide more protection to the myocardium of patients undergoing on-pump coronary artery bypass grafting.

Methods
In this placebo-controlled randomized controlled study, patients in the RIPC group received four 5-min cycles of 300 mmHg cuff inflation/deflation of the leg before aortic cross-clamping. Anesthesia consisted of opioids and propofol for induction and isoflurane for maintenance. The primary outcome was high-sensitivity cardiac troponin T release. Secondary endpoints were plasma levels of N-terminal pro-brain natriuretic peptide, high-sensitivity C-reactive protein, S100 protein, and short- and long-term clinical outcomes. Gene expression profiles were obtained from atrial tissue using microarrays.

Results
RIPC (n = 27) did not reduce high-sensitivity cardiac troponin T release when compared with placebo (n = 28). Likewise, N-terminal pro-brain natriuretic peptide, a marker of myocardial dysfunction; high-sensitivity C-reactive protein, a marker of perioperative inflammatory response; and S100, a marker of cerebral injury, were not different between the groups. The incidence for the perioperative composite endpoint combining new arrhythmias and myocardial infarctions was higher in the RIPC group than the placebo group (14/27 vs. 6/28, P = 0.036). However, there was no difference in the 6-month cardiovascular outcome. N-terminal pro-brain natriuretic peptide release correlated with isoflurane-induced transcriptional changes in fatty-acid metabolism (P = 0.001) and DNA-damage signaling (P < 0.001), but not with RIPC-induced changes in gene expression.

Conclusions
RIPC applied during isoflurane inhalation provides no benefit to the myocardium of patients undergoing on-pump coronary artery bypass grafting.