GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Findings from an in-Depth Annual Tree-Ring Radiocarbon Intercomparison
    Cambridge University Press (CUP) ; 2020
    In:  Radiocarbon Vol. 62, No. 4 ( 2020-08), p. 873-882
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 62, No. 4 ( 2020-08), p. 873-882
    Abstract: The radiocarbon ( 14 C) calibration curve so far contains annually resolved data only for a short period of time. With accelerator mass spectrometry (AMS) matching the precision of decay counting, it is now possible to efficiently produce large datasets of annual resolution for calibration purposes using small amounts of wood. The radiocarbon intercomparison on single-year tree-ring samples presented here is the first to investigate specifically possible offsets between AMS laboratories at high precision. The results show that AMS laboratories are capable of measuring samples of Holocene age with an accuracy and precision that is comparable or even goes beyond what is possible with decay counting, even though they require a thousand times less wood. It also shows that not all AMS laboratories always produce results that are consistent with their stated uncertainties. The long-term benefits of studies of this kind are more accurate radiocarbon measurements with, in the future, better quantified uncertainties.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/RDC.2020.49
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    IntCal09 and Marine09 Radiocarbon Age Calibration Curves, 0–50,000 Years cal BP
    Cambridge University Press (CUP) ; 2009
    In:  Radiocarbon Vol. 51, No. 4 ( 2009), p. 1111-1150
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 51, No. 4 ( 2009), p. 1111-1150
    Abstract: The IntCal04 and Marine04 radiocarbon calibration curves have been updated from 12 cal kBP (cal kBP is here defined as thousands of calibrated years before AD 1950), and extended to 50 cal kBP, utilizing newly available data sets that meet the IntCal Working Group criteria for pristine corals and other carbonates and for quantification of uncertainty in both the 14 C and calendar timescales as established in 2002. No change was made to the curves from 0–12 cal kBP. The curves were constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model used for IntCal04 and Marine04. The new curves were ratified at the 20th International Radiocarbon Conference in June 2009 and are available in the Supplemental Material at www.radiocarbon.org .
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/S0033822200034202
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2009
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Selection and Treatment of Data for Radiocarbon Calibration: An Update to the International Calibration (IntCal) Criteria
    Cambridge University Press (CUP) ; 2013
    In:  Radiocarbon Vol. 55, No. 4 ( 2013), p. 1923-1945
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 55, No. 4 ( 2013), p. 1923-1945
    Abstract: High-quality data from appropriate archives are needed for the continuing improvement of radiocarbon calibration curves. We discuss here the basic assumptions behind 14 C dating that necessitate calibration and the relative strengths and weaknesses of archives from which calibration data are obtained. We also highlight the procedures, problems, and uncertainties involved in determining atmospheric and surface ocean 14 C/ 12 C in these archives, including a discussion of the various methods used to derive an independent absolute timescale and uncertainty. The types of data required for the current IntCal database and calibration curve model are tabulated with examples.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.2458/azu_js_rc.55.16955
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2013
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Extended Radiocarbon Calibration in the Anglo-Saxon Period, AD 395–485 and AD 735–805
    Cambridge University Press (CUP) ; 2008
    In:  Radiocarbon Vol. 50, No. 1 ( 2008), p. 11-17
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 50, No. 1 ( 2008), p. 11-17
    Abstract: Radiocarbon dating has been used infrequently as a chronological tool for research in Anglo-Saxon archaeology. Primarily, this is because the uncertainty of calibrated dates provides little advantage over traditional archaeological dating in this period. Recent advances in Bayesian methodology in conjunction with high-precision 14 C dating have, however, created the possibility of both testing and refining the established Anglo-Saxon chronologies based on typology of artifacts. The calibration process within such a confined age range, however, relies heavily on the structural accuracy of the calibration curve. We have previously reported decadal measurements on a section of the Irish oak chronology for the period AD 495–725 (McCormac et al. 2004). In this paper, we present decadal measurements for the periods AD 395–485 and AD 735–805, which extends the original calibration set.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/S0033822200043344
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2008
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)
    Cambridge University Press (CUP) ; 2020
    In:  Radiocarbon Vol. 62, No. 4 ( 2020-08), p. 725-757
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 62, No. 4 ( 2020-08), p. 725-757
    Abstract: Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14 C concentration. Although calibration curves are constructed from independently dated archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume the international 14 C calibration curves for both the Northern and Southern Hemispheres, as well as for the ocean surface layer, have been updated to include a wealth of new data and extended to 55,000 cal BP. Based on tree rings, IntCal20 now extends as a fully atmospheric record to ca. 13,900 cal BP. For the older part of the timescale, IntCal20 comprises statistically integrated evidence from floating tree-ring chronologies, lacustrine and marine sediments, speleothems, and corals. We utilized improved evaluation of the timescales and location variable 14 C offsets from the atmosphere (reservoir age, dead carbon fraction) for each dataset. New statistical methods have refined the structure of the calibration curves while maintaining a robust treatment of uncertainties in the 14 C ages, the calendar ages and other corrections. The inclusion of modeled marine reservoir ages derived from a three-dimensional ocean circulation model has allowed us to apply more appropriate reservoir corrections to the marine 14 C data rather than the previous use of constant regional offsets from the atmosphere. Here we provide an overview of the new and revised datasets and the associated methods used for the construction of the IntCal20 curve and explore potential regional offsets for tree-ring data. We discuss the main differences with respect to the previous calibration curve, IntCal13, and some of the implications for archaeology and geosciences ranging from the recent past to the time of the extinction of the Neanderthals.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/RDC.2020.41
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Intestinal microflora, morphology and enzyme activity in zinc-deficient and Zn-supplemented rats
    Cambridge University Press (CUP) ; 1986
    In:  British Journal of Nutrition Vol. 55, No. 3 ( 1986-05), p. 603-611
    Details
    In: British Journal of Nutrition, Cambridge University Press (CUP), Vol. 55, No. 3 ( 1986-05), p. 603-611
    Abstract: 1. Immature, male Wistar rats were given a low-zinc diet (2 mg/kg) for 22–24 d. Control groups received a similar diet supplemented with 58 mg Zn/kg either ad lib. , or in amounts matched to the consumption of the Zn-deficient group. Food consumption, rate of growth and food conversion efficiency were markedly lower in the Zn-deficient group of rats compared with controls. Appetite, growth rate and food utilization improved dramatically over a subsequent 4 d period of Zn supplementation. 2. Morphological examination of samples of jejunum and ileum confirmed that Zn deficiency in the rat is accompanied by a reduction in villous dimensions and increase in villous density. After a short period of Zn supplementation, villous density and the basal width and maximum height of individual villi in the jejunum returned to normal. Similar changes occurred in the ileum but to a lesser extent. 3. Mucosal alkaline phosphatase ( EC 3.1.3.1) activity was significantly lower in the small intestine of Zn-deficient rats compared with Zn-supplemented rats. Disaccharidase activities were lower in the Zn-deficient group, compared with their feed-restricted counterparts, but were similar to values for ad lib .-fed controls. Tissue alkaline phosphatase and disaccharidase activitities were consistently higher after a 4 d period of Zn supplementation, compared with non-supplemented animals, but this increase was only significant for alkaline phosphatase. 4. Although there were striking similarities in the mucosal characteristics of gnotobiotic and Zn-deficient rats, there was no indication that even severe dietary Zn depletion reduced the numbers of viable bacteria present in either the small or large intestine. Changes in intestinal structure and function resulting from variation in dietary Zn intake appear, therefore, to be unrelated to changes in the intestinal flora.
    Type of Medium: Online Resource
    ISSN: 0007-1145 , 1475-2662
    URL: Article
    DOI: 10.1079/BJN19860065
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1986
    detail.hit.zdb_id: 2016047-1
    SSG: 12
    SSG: 21
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Impact of early home language exposure on phonological and orthographic skills and their contributions to English literacy abilities in English monolingual and Chinese–English bilingual adults
    Cambridge University Press (CUP) ; 2017
    In:  Applied Psycholinguistics Vol. 38, No. 1 ( 2017-01), p. 181-210
    Details
    In: Applied Psycholinguistics, Cambridge University Press (CUP), Vol. 38, No. 1 ( 2017-01), p. 181-210
    Abstract: Relatively little is known about the importance of phonological and orthographic processing skills for reading and spelling in monolingual and bilingual adults. We compared these underlying skills, using a series of phonological and orthographic tasks, in English monolingual ( n = 28), English first language and Chinese second language bilingual ( n = 21), and Chinese first language and English second language bilingual adults ( n = 22) who were equally proficient in reading and spelling English, and examined the contributions of these skills to English word reading and spelling for each group. The results showed group differences in phonological processing, with English monolingual adults having better phonological skills than both groups of bilingual adults. No significant group differences were found for orthographic processing. Regression analyses showed phonological skills were a unique predictor of English word reading for both bilingual groups, but not for the English monolingual group. Orthographic skills were a significant predictor of English word spelling, but only for the English monolingual adults. This suggests there may be a long-lasting influence of being exposed to two contrasting languages on skills underlying literacy in bilingual individuals.
    Type of Medium: Online Resource
    ISSN: 0142-7164 , 1469-1817
    URL: Article
    DOI: 10.1017/S0142716416000151
    RVK:
    EQ 1285
    RVK:
    EQ 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2017
    detail.hit.zdb_id: 1499968-7
    SSG: 5,2
    SSG: 7,11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    The ANU WiFeS SuperNovA Programme (AWSNAP)
    Cambridge University Press (CUP) ; 2016
    In:  Publications of the Astronomical Society of Australia Vol. 33 ( 2016)
    Details
    In: Publications of the Astronomical Society of Australia, Cambridge University Press (CUP), Vol. 33 ( 2016)
    Abstract: This paper presents the first major data release and survey description for the ANU WiFeS SuperNovA Programme. ANU WiFeS SuperNovA Programme is an ongoing supernova spectroscopy campaign utilising the Wide Field Spectrograph on the Australian National University 2.3-m telescope. The first and primary data release of this programme (AWSNAP-DR1) releases 357 spectra of 175 unique objects collected over 82 equivalent full nights of observing from 2012 July to 2015 August. These spectra have been made publicly available via the WISEREP supernova spectroscopy repository. We analyse the ANU WiFeS SuperNovA Programme sample of Type Ia supernova spectra, including measurements of narrow sodium absorption features afforded by the high spectral resolution of the Wide Field Spectrograph instrument. In some cases, we were able to use the integral-field nature of the Wide Field Spectrograph instrument to measure the rotation velocity of the SN host galaxy near the SN location in order to obtain precision sodium absorption velocities. We also present an extensive time series of SN 2012dn, including a near-nebular spectrum which both confirms its ‘super-Chandrasekhar’ status and enables measurement of the sub-solar host metallicity at the SN site.
    Type of Medium: Online Resource
    ISSN: 1323-3580 , 1448-6083
    URL: Article
    DOI: 10.1017/pasa.2016.47
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2016
    detail.hit.zdb_id: 2560489-2
    detail.hit.zdb_id: 2079225-6
    SSG: 16,12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Neuropsychiatric phenotypes of anti-NMDAR encephalitis: a prospective study
    Cambridge University Press (CUP) ; 2023
    In:  Psychological Medicine Vol. 53, No. 9 ( 2023-07), p. 4266-4274
    Details
    In: Psychological Medicine, Cambridge University Press (CUP), Vol. 53, No. 9 ( 2023-07), p. 4266-4274
    Abstract: Patients with anti- N -methyl- d -aspartate (NMDA) receptor encephalitis (ANMDARE) show a wide range of behavioral abnormalities and are often mistaken for primary psychiatric presentations. We aimed to determine the behavioral hallmarks of ANMDARE with the use of systematic neuropsychiatric and cognitive assessments. Methods A prospective study was conducted, with 160 patients admitted to the National Institute of Neurology and Neurosurgery of Mexico, who fulfilled criteria for possible autoimmune encephalitis and/or red flags along a time window of seven years. Cerebrospinal fluid (CSF) antibodies against the NR1 subunit of the NMDAR were processed with rat brain immunohistochemistry and cell-based assays with NMDA expressing cells. Systematic cognitive, neuropsychiatric, and functional assessments were conducted before knowing NMDAR antibodies results. A multivariate analysis was used to compare patients with and without definite ANMDARE according to antibodies in CSF. Results After obtaining the CSF antibodies results in 160 consecutive cases, 100 patients were positive and classified as having definite ANMDARE. The most frequent neuropsychiatric patterns were psychosis (81%), delirium (75%), catatonia (69%), anxiety-depression (65%), and mania (27%). Cognition was significantly impaired. A total of 34% of the patients had a predominantly neuropsychiatric presentation without seizures. After multivariate analysis, the clinical hallmarks of ANMDARE consisted of a catatonia–delirium comorbidity, tonic-clonic seizures, and orolingual dyskinesia. Conclusions Our study supports the notion of a neurobehavioral phenotype of ANMDARE characterized by a fluctuating course with psychotic and affective symptoms, catatonic signs, and global cognitive dysfunction, often accompanied by seizures and dyskinesia. The catatonia–delirium comorbidity could be a distinctive neurobehavioral phenotype of ANMDARE.
    Type of Medium: Online Resource
    ISSN: 0033-2917 , 1469-8978
    URL: Article
    DOI: 10.1017/S0033291722001027
    RVK:
    XA 10000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2023
    detail.hit.zdb_id: 1470300-2
    SSG: 5,2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Radiocarbon Calibration in the Anglo-Saxon Period: Ad 495–725
    Cambridge University Press (CUP) ; 2004
    In:  Radiocarbon Vol. 46, No. 3 ( 2004), p. 1123-1125
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 46, No. 3 ( 2004), p. 1123-1125
    Abstract: Radiocarbon dating has been rarely used for chronological problems relating to the Anglo-Saxon period. The “flatness” of the calibration curve and the resultant wide range in calendrical dates provide little advantage over traditional archaeological dating in this period. Recent advances in Bayesian methodology have, however, created the possibility of refining and checking the established chronologies, based on typology of artifacts, against 14 C dates. The calibration process, within such a confined age range, however, relies heavily on the structural accuracy of the calibration curve. We have therefore re-measured, at decadal intervals, a section of the Irish oak chronology for the period AD 495–725. These measurements have been included in IntCal04.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/S0033822200033051
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2004
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...