JOURNAL OF NEUROCHEMISTRY, Issue 3 2006
Steve Poirier
Abstract Neural apoptosis-regulated convertase-1/proprotein convertase subtilisin-kexin like-9 (NARC-1/PCSK9) is a proprotein convertase recently described to play a major role in cholesterol homeostasis through enhanced degradation of the low-density lipoprotein receptor (LDLR) and possibly in neural development. Herein, we investigated the potential involvement of this proteinase in the development of the CNS using mouse embryonal pluripotent P19 cells and the zebrafish as models. Time course quantitative RT,PCR analyses were performed following retinoic acid (RA)-induced neuroectodermal differentiation of P19 cells. Accordingly, the mRNA levels of NARC-1/PCSK9 peaked at day 2 of differentiation and fell off thereafter. In contrast, the expression of the proprotein convertases subtilisin kexin isozyme 1/site 1 protease and Furin was unaffected by RA, whereas that of PC5/6 and PC2 increased within and/or after the first 4 days of the differentiation period respectively. This pattern was not affected by the cholesterogenic transcription factor sterol regulatory element-binding protein-2, which normally up-regulates NARC-1/PCSK9 mRNA levels in liver. Furthermore, in P19 cells, RA treatment did not affect the protein level of the endogenous LDLR. This agrees with the unique expression pattern of NARC-1/PCSK9 in the rodent CNS, including the cerebellum, where the LDLR is not significantly expressed. Whole-mount in situ hybridization revealed that the pattern of expression of zebrafish NARC-1/PCSK9 is similar to that of mouse both in the CNS and periphery. Specific knockdown of zebrafish NARC-1/PCSK9 mRNA resulted in a general disorganization of cerebellar neurons and loss of hindbrain,midbrain boundaries, leading to embryonic death at ,,96 h after fertilization. These data support a novel role for NARC-1/PCSK9 in CNS development, distinct from that in cholesterogenic organs such as liver. [source]

NEW BASES FOR PERCUTANEOUS CAVAL FILTER PLACEMENT ON SITE IN GERIATRIC INSTITUTION IN PATIENTS AGED 75 AND OLDER

JOURNAL OF AMERICAN GERIATRICS SOCIETY, Issue 5 2005
Alain F. Le Blanche MD
No abstract is available for this article. [source]

EVAPOTRANSPIRATION DYNAMICS AT AN ECOHYDROLOGICAL RESTORATION SITE: AN ENERGY BALANCE AND REMOTE SENSING APPROACH,

JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 3 2006
Jason W. Oberg
ABSTRACT: Little work is reported where spatial methods are employed to monitor evapotranspiration (ET) changes as a result of vegetation and wetland restoration. A remote sensing approach with the Surface Energy Balance Algorithm for Land (SEBAL) for estimating ET at The Nature Conservancy's Glacial Ridge prairie-wetland restoration site in northwestern Minnesota is presented. The calibrated 24-hour ET from SEBAL was estimated with an average error of prediction of ,4.3 percent. Monthly, interseasonal, and seasonal ET for the period of June to September (2000 to 2003) from three adjacent land-uses: a hydrologic control preserved wetland; a treated or restored site; and a nontreated or impacted wetland, were used in the study. Results from comparing ET behavior to the preserve suggest restoration efforts have affected monthly and seasonal ET within the treated site. Spatial average standard deviations of the seasonal ET within the preserve, treated, and nontreated sites give 47.3, 75.7, and 109.9 mm, respectively, suggesting hydrologic stabilization within the treated site. Monthly and interseasonal comparisons show similar behavior to that of the seasonal data, where monthly correlations suggest increasing agreement within the treated site, approaching those within the preserve. [source]

Evaluation of a vertical frozen soil barrier at oak ridge national laboratory

REMEDIATION, Issue 3 2000
Stanley W. Lynn
Arctic Foundations, Inc. (AFI), of Anchorage, Alaska, has developed a freeze barrier system designed to hydraulically isolate a contaminant source area. The system can be used for long-term or temporary containment of groundwater until appropriate remediation techniques can be applied. The technology was evaluated under the United States Environmental Protection Agency's (EPA's) Superfund Innovative Technology Evaluation (SITE) program at the United States Department of Energy's (DOE's) Oak Ridge National Laboratory (ORNL) facility in Oak Ridge, Tennessee. For the demonstration, an array of freeze pipes called "thermoprobes" was installed to a depth of 30 feet below ground surface around a former waste collection pond and keyed into bedrock. The system was used to establish an impermeable frozen soil barrier to hydraulically isolate the pond. Demonstration personnel collected independent data to evaluate the technology's performance. A variety of evaluation tools were used,including a groundwater dye tracing investigation, groundwater elevation measurements, and subsurface soil temperature data,to determine the effectiveness of the freeze barrier system in preventing horizontal groundwater flow beyond the limits of the frozen soil barrier. Data collected during the demonstration provided evidence that the frozen soil barrier was effective in hydraulically isolating the pond. [source]

OXYGEN AND CARBON ISOTOPE ANALYSIS OF HUMAN TOOTH ENAMEL FROM THE NEW KINGDOM SITE OF TOMBOS IN NUBIA

ARCHAEOMETRY, Issue 5 2010
M. R. BUZON
This study examines the feasibility of using oxygen isotope analysis of tooth carbonate to identify immigrants from the New Kingdom site of Tombos in Nubia (n = 30). In comparison with published data, the results (,18Oca,VSMOW = 31.4,) imply a substantial presence of immigrants. However, further analysis of these data strongly suggests the need to consider hydrological and cultural factors such as the contribution of aquifer waters to the Nile, use of groundwater sources, and differences in handling and storage of water. The carbon isotope analysis, in conjunction with published 87Sr/86Sr data, provides additional support for the presence of immigrants at Tombos. [source]

NEW FRAMES OF ARCHAEOMETRICAL DESCRIPTION OF SPINDLE WHORLS: A CASE STUDY OF THE LATE ENEOLITHIC SPINDLE WHORLS FROM THE 1C SITE IN GRÓDEK, DISTRICT OF HRUBIESZÓW, POLAND

ARCHAEOMETRY, Issue 5 2010
T. CHMIELEWSKI
The essential role of yarn spinning in textile production is indisputable. In this context, spindle whorls, the basic spinning accessories that can be found in the archaeological record, are commonly discussed. Even though the importance of the technical specification of spindle whorls has been already recognized by some authors, their functional characteristics are usually limited to the basic parameters affecting their usage range (i.e., weight, diameter and height). And since the mass moment of inertia of spindle whorls is considered to be a salient index when discussing their technical variability, the descriptions are deficient. With this short study, we intend to implement further research with more complete and flexible frames for the description of spindle whorls, based on a simple and fast-paced method of the angular mass measurement as well as relevant typology based on clear morphometrical criteria. On the basis of the examination of a small sample of Eneolithic artefacts (the South-Eastern Group of the Funnel Beaker Culture, c. 3650 to 2800 bc), a case study of the functioning of spindle whorls is also conducted. [source]

PETROGRAPHY AND PROVENANCE INTERPRETATION OF THE STONE MOULDS FOR BRONZE DAGGERS FROM THE GALDONG PREHISTORIC SITE, REPUBLIC OF KOREA*

ARCHAEOMETRY, Issue 1 2010
C. H. LEE
This paper presents material characteristics and raw material provenance of the stone moulds for bronze slender daggers from Galdong. This type of bronze dagger is uniquely distributed in the Korean Peninsula and these stone moulds were the first to be found by excavation. The stone moulds were made of igneous hornblendite with course-grained holocrystalline textures. Based on petrological, mineralogical and geochemical characteristics, the original rock materials of the moulds were inferred to be derived from the Jangsu or Namwon areas which are about 50 km away from the excavation site. It is a notable achievement that this provenance study confirmed the domestic production of Korean-styled daggers. [source]

GC/MS ANALYSIS OF FATTY ACIDS FROM ANCIENT HEARTH RESIDUES AT THE SWAN POINT ARCHAEOLOGICAL SITE,

ARCHAEOMETRY, Issue 1 2009
B. L. KEDROWSKI
Gas chromatography , mass spectrometry (GC/MS) is used to analyse soil residues from hearth sites in Swan Point, Alaska. An experimental hearth is also prepared by burning animal bones to study the characteristics of bone fires and the lipid residues that they leave embedded in soil. Hearth soil samples are derivatized with HCl in methanol to convert bound and unbound fatty acids into methyl esters. Concentrations of saturated fatty acid methyl esters in the samples are determined and their ratios analysed. The fatty acid patterns found in ancient campfires are consistent with burning bones of large ruminants as well as monogastric herbivores. [source]

INCISED SLIPWARE PRODUCTION AT CASTELFIORENTINO (FLORENCE): THE ,VIA BERTINI' SITE (15TH,17TH CENTURIES)*

ARCHAEOMETRY, Issue 5 2008
N. BRIANESE
This study deals with the physical,chemical and mineralogical,petrographic investigations (OM, SEM,EDS, EPMA, ICP, XRpD, Mössbauer and IR) conducted on first- and second-firing wasters belonging to two types of incised slipware (sgraffito), manufactured at Castelfiorentino between the late 15th and the early 17th centuries. Raw materials, colouring agents and firing products were analysed in order to establish the production technology of the ceramic coatings, by means of detailed microtextural and chemical investigations. The pottery underwent two firing processes: the firing of the white slip-coated ceramic body and a further firing after application of the glaze. The homogeneity of the raw materials, white slip and glaze is remarkable, and demonstrates the use of well-established recipes with a constant supply of raw materials from the same places. Highly efficient kiln management during both firings is revealed by body,glaze interface reactions. [source]

THE PETROGRAPHY AND CHEMISTRY OF THIN-WALLED WARE FROM AN HELLENISTIC, ROMAN SITE AT SEGESTA (SICILY),

ARCHAEOMETRY, Issue 3 2003
G. Montana
Samples of Roman thin-walled ware from Segesta (northwestern Sicily), dating back to the early Imperial period, were studied by optical microscopy (OM) and Neutron Activation Analysis (NAA). Up to now, this class of Roman fine tableware has only occasionally been evaluated archaeometrically. Nevertheless, numerous production centres are believed to have been simultaneously active in the western Mediterranean area. Petrographic and chemical data seem to be in agreement with the archaeological hypothesis of local manufacture in Segesta for most of the analysed samples, through a comparison with kiln wasters and local raw materials. The effectiveness of thin-section petrography for determining the provenance of such a tiny tempered class of pottery and the integrated use of two different grouping procedures (petrography and chemistry) were also tested. [source]

PLACE, PRINT AND MIRACLE: FORLÍ'S MADONNA OF THE FIRE AS FUNCTIONAL SITE

ART HISTORY, Issue 3 2008
LISA PON
The Madonna of the Fire of Forlì is an early woodcut that miraculously survived a fire in 1428, and still resides in the cathedral of Forlì, a city southeast of Bologna. This miracle removed the woodcut from the traffic in images crossing geographic and chronological boundaries in which other early modern prints participated. Since 1428 it has acted instead as a functional site, bound to a single place and able to galvanize disparate local elements into a communal sense of emplacement. This essay explores both that ability to generate a local identity, as well as the Madonna of the Fire's status as a miraculous object. For the transformation of the Madonna of the Fire from quotidian devotional print to miraculous cult icon also activated its ability to work as a functional site by charging overlapping material, geographic and discursive loci with communal significance. [source]

SITEs revisited: Socioeconomic and demographic contours of small island tourist economies

ASIA PACIFIC VIEWPOINT, Issue 1 2010
Jerome L. McElroy
Abstract This study attempts to do three things: (i) provide a review of recent advances in the small island economy literature using the tourism penetration index, (ii) update the impact of tourism across the same global sample of 36 small islands (less than 1 million in population and 5000 km2 in area) introduced in APV 47 (1) 2006, and (iii) employing an abbreviated version of the destination life cycle as a development paradigm, construct three different socioeconomic and demographic profiles based on low, intermediate and high tourism impact. Results using cross-sectional data of 27 indicators reveal three statistically distinct profiles that demonstrate three stages of economic development. Specifically, the findings contrast the low-income, labour-exporting, least tourism-penetrated MIRAB-type (Migrant/Remittances and Aid/Bureaucracy) emerging islands with their more advanced intermediate impact neighbours. In turn, the latter fall at a significant distance from the most successful small island tourist economy (SITE) destinations. Thus, this study further refines the characteristics of SITE islands and confirms the viability of tourism in general and the destination life cycle in particular as an effective engine and model, respectively, of island development. [source]

ENDOSCOPIC DIAGNOSIS OF INTRAEPITHELIAL SQUAMOUS NEOPLASIA IN HEAD AND NECK AND ESOPHAGEAL MUCOSAL SITES

DIGESTIVE ENDOSCOPY, Issue 2006
Manabu Muto
In the multistep process of squamous epithelial carcinogenesis, squamous epithelial dysplasia has been considered to be a preinvasive stage of squamous cell carcinoma. If we could distinguish a dysplasia at high risk, such lesions could be targets for local treatment such as endoscopic mucosal resection to avoid the transformation to invasive carcinoma. Narrow-band imaging, a new optical technology, is useful to identify the cancerous lesion compared to conventional white light image. In addition, narrow-band imaging combined with magnifying endoscopy makes it possible to visualize the changes of microvascular architecture occurring in the epithelium. To evaluate whether these endoscopic findings are reliable to diagnose a dysplasia at high risk, a prospective study on the basis of the standards for reporting diagnostic accuracy initiative is needed. If endoscopic assessment of intraepithelial squamous neoplasia is reliable, it would be of benefit to the patients' outcome and improve cost effectiveness of care because of the avoidance of developing invasive carcinoma and the reduction of unnecessary biopsies. [source]

WEB SITES & LISTSERVERS

ECOLOGICAL MANAGEMENT & RESTORATION, Issue 3 2004
Article first published online: 25 APR 200
No abstract is available for this article. [source]

FITNESS COSTS OF INSECTICIDE RESISTANCE IN NATURAL BREEDING SITES OF THE MOSQUITO CULEX PIPIENS

EVOLUTION, Issue 1 2004
Denis Bourguet
Abstract Genetic changes conferring adaptation to a new environment may induce a fitness cost in the previous environment. Although this prediction has been verified in laboratory conditions, few studies have tried to document this cost directly in natural populations. Here, we evaluated the pleiotropic effects of insecticide resistance on putative fitness components of the mosquito Culex pipiens. Experiments using different larval densities were performed during the summer in two natural breeding sites. Two loci that possess alleles conferring organophosphate (OP) resistance were considered: ace-1 coding for an acetylcholinesterase (AChE1, the OP target) and Ester, a "super locus" including two closely linked loci coding for esterases A and B. Resistance ace-1 alleles coding for a modified AChE1 were associated with a longer development time and shorter wing length. The pleiotropic effects of two resistance alleles Ester1 and Ester4 coding for the overproduced esterases A1 and A4-B4, respectively, were more variable. Both A1 and A4-B4 reduced wing length, although only A1 was associated with a longer preimaginal stage. The fluctuating asymmetry (FA) of the wing did not respond to the presence or to the interaction of resistance alleles at the two loci at any of the density levels tested. Conversely, the FA of one wing section decreased when larval density increased. This may be the consequence of selection against less developmentally stable individuals. The results are discussed in relation to the local evolution of insecticide resistance genes. [source]

RELIGION AND POLITICS: NEW RELIGIOUS SITES AND SPATIAL TRANSGRESSION IN ISRAEL,

GEOGRAPHICAL REVIEW, Issue 2 2008
Noga Collins-Kreiner
ABSTRACT. In order to view the establishment of new religions centers and how they are received by local populations, I analyze such basic geographical concepts as scale, space, location, and image. I see how these can alter the perception and further refine the concept of spatial transgression in three case studies in Israel: the building of the Mormon Center in Jerusalem, the establishment of the Bahá,í Gardens in Haifa, and the struggle to build a mosque in Nazareth. In this article I seek to identify the factors influencing the presence or absence of conflict to help explain the different "stories" revealed. The article also constitutes an addition to the literature on Israeli (and Palestinian) religiogeographical controversies by focusing on nonmainstream or nondominant cases and by comparing the relative roles of different factors that shape the success or failure of spatial transgressions in religious geography. [source]

ISLANDS AS NOVELTY SITES,

GEOGRAPHICAL REVIEW, Issue 2 2007
GODFREY BALDACCHINO
ABSTRACT. Being on the edge, being out of sight and so out of mind, exposes the weakness of mainstream ideas, orthodoxies, and paradigms and foments alternatives to the status quo. Islands are thus propelled as sites of innovative conceptualizations, whether of nature or human enterprise, whether virtual or real. They stand out as sites of novelty; they tend toward clairvoyance; they are disposed to act as advance indicators or extreme reproductions of what is present or future elsewhere. This article, which is essentially bibliographical, celebrates islands as the quintessential sites for experimentation, with reference to the physical sciences, the social sciences, and literature. [source]

MARSH DEVELOPMENT AT RESTORATION SITES ON THE WHITE MOUNTAIN APACHE RESERVATION, ARIZONA,

JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 6 2003
Jonathan W. Long
ABSTRACT: To prioritize sites for riparian restoration, resource managers need to understand how recovery processes vary within landscapes. Complex relationships between watershed conditions and riparian development make it difficult to predict the outcomes of restoration treatments in the semiarid Southwest. Large floods in 1993 scoured riparian areas in the Carrizo watershed on the White Mountain Apache Reservation in east-central Arizona. We evaluated recovery at three of these sites using repeated photographs and measurements of channel cross sections and stream-side vegetation along permanent transects. The sites were mapped as lying on the same soil type, had similar streamside vegetative communities, and were similarly treated through livestock exclusion and supplemental seeding. However, the sites and individual reaches within the sites followed strikingly different development paths. Dramatic recovery occurred at a perennial reach where cover of emergent wetland plants increased from 4.7 percent (standard error = 0.8 percent) in October 1995 to 55.5 percent (standard error = 2.7 percent) in September 2001. At several other reaches, geologic and hydro geomorphic characteristics of the sites limited inputs of fine sediment or surface water, resulting in modest or negligible increases in emergent cover. Recovery efforts for highly valued marshlands in this region should prioritize perennial reaches in low gradient valleys where salty sediments are abundant. [source]

EFFECTS OF TOPOGRAPHY AND SOIL PROPERTIES ON RECHARGE AT TWO SITES IN AN AGRICULTURAL FIELD,

JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 6 2000
Geoffrey N. Delin
ABSTRACT: Field experiments were conducted from 1992 to 1995 to estimate ground water recharge rates at two sites located within a 2.7-hectare agricultural field. The field lies in a sand plain setting in central Minnesota and is cropped continuously in field corn. The sites are located at a topographically high (upland) site and a topographically low (lowland) site in an effort to quantify the effects of depression focusing of recharge. Three site-specific methods were used to estimate recharge rates: well hydrograph analysis, chlorofluorocarbon age dating, and an unsaturated zone water balance. All three recharge methods indicated that recharge rates at the lowland site (annual average of all methods of 29 cm) exceeded those at the upland site (annual average of 18 cm). On an annual basis, estimates by the individual methods ranged from 12 to 44 percent of precipitation at the upland site and from 21 to 83 percent at the lowland site. The difference in recharge rates between the sites is primarily attributed to depression focusing of surface water runon at the lowland site. However, two other factors were also important: the presence of thin lamellae at the upland site, and coarser textured soils below a depth of 1.5 m at the lowland site. [source]

INCREASING THE PRECISION OF THEODOLITE TRACKING: MODIFIED TECHNIQUE TO CALCULATE THE ALTITUDE OF LAND-BASED OBSERVATION SITES

MARINE MAMMAL SCIENCE, Issue 4 2004
H. Bailey
[source]

IRON PRODUCTION SITES IN SOUTHERN BÉNIN

ACTA ARCHAEOLOGICA, Issue 1 2009
Article first published online: 5 JUL 2010
No abstract is available for this article. [source]

Ecoregional planning in marine environments: identifying priority sites for conservation in the northern Gulf of Mexico

AQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS, Issue 4 2001
Michael W. Beck
Abstract 1.,The overall aim of this work was to identify sites within the northern Gulf of Mexico that, if protected, would fully represent the biological diversity of the nearshore waters of this ecoregion. In this paper, we focus on the eastern subregion, northwest Florida, to illustrate the process of ecoregional planning in marine environments. 2.,The basic steps in ecoregional planning include: identification of conservation targets, i.e. species and habitats; collection of data on their ecology and distribution; determination of conservation goals for the amount of targets that must be protected; and identification of a set of sites that meets these goals for all targets. 3.,As a preliminary goal, it was determined that the set of priority sites should contain at least 20% of the current distribution of each target habitat and species. 4.,Two primary tools were used to choose a set of priority sites: a reserve selection program, SITES, and interviews and a workshop with scientists and managers. The final set of priority sites integrated information from these various sources. 5.,The goals were exceeded for all conservation targets in the priority sites. On average, 75 and 58% of the distributions of the habitat targets were contained within the priority and high priority sites, respectively. These priority and high priority sites only occupied 29 and 17% of the study area, respectively. 6.,One of the first steps in the conservation of the bays identified as priority sites is the recognition that they are integrally linked by important processes to the surrounding terrestrial and aquatic environments. Conservation in a part of these estuarine landscapes will benefit biodiversity across environments. Copyright © 2001 John Wiley & Sons, Ltd. [source]

CHEMICAL COMPARISON OF RARE CHINESE WHITE POTTERY FROM FOUR SITES OF THE ERLITOU STATE: RESULTS AND ARCHAEOMETRICAL IMPLICATIONS

ARCHAEOMETRY, Issue 5 2010
BAO-PING LI
White pottery is among the most significant finds from China's earliest state, Erlitou (c. 1900,1500 bc). Samples were primarily discovered in small numbers from elite tombs of a few sites, leading to the hypothesis that they were made at only a few locations and then circulated regionally as prestige items. To facilitate determining provenances, we compare the ICP,MS trace elements and TIMS Sr isotopes of whiteware with two soil samples from Nanwa, a possible manufacturing site, and with shards found at three other sites: Erlitou, Huizui and Nanzhai. The Nanwa shards demonstrate special elemental and Sr isotopic features. Considering the chemical observation and archaeological background together, we propose that Nanwa was a centre for whiteware production, although the two soil samples we collected there were probably not the exact materials used. Some whiteware pieces from Erlitou, Huizui and Nanzhai fall in the chemical field defined by Nanwa samples, indicating that they were possibly made at Nanwa. Many other samples from these three sites plot outside the Nanwa field, implying they were probably not Nanwa products. This study demonstrates that while chemical sourcing is very useful, firm archaeological context must remain the cornerstone of such research. [source]

COOKING WARES IN ANCIENT SYRIA (FIRST TO 10TH CENTURIES ad): RECONSTRUCTING THE PRODUCTION CONTEXTS FROM THE CONSUMPTION SITES

ARCHAEOMETRY, Issue 4 2010
A. VOKAER
This paper deals with Brittle Ware, a cooking ware product that appears to have been highly standardized and widely distributed in Syria during the Roman and the Byzantine periods. The study intends to determine the distribution of Brittle Ware through time and space, by combining typology and a thorough examination of the fabrics in the field, using binocular microscopy (n = 2807 diagnostic fragments). Based on the fabric groupings, petrological and chemical analyses were then undertaken. Resting on an archaeological background and several analytical methods, this paper aims at going beyond a limited provenance study, by characterizing the Brittle Ware production system and thus providing some insights into the economy of ancient Syria. [source]

DATING OF THE HOMINID (HOMO NEANDERTHALENSIS) REMAINS ACCUMULATION FROM EL SIDRÓN CAVE (PILOÑA, ASTURIAS, NORTH SPAIN): AN EXAMPLE OF A MULTI-METHODOLOGICAL APPROACH TO THE DATING OF UPPER PLEISTOCENE SITES

ARCHAEOMETRY, Issue 4 2010
T. De TORRES
The age of Neanderthal remains and associated sediments from El Sidrón cave has been obtained through different dating methods (14CAMS, U/TH, OSL, ESR and AAR) and samples (charcoal debris, bone, tooth dentine, stalagmitic flowstone, carbonate-rich sediments, sedimentary quartz grains, tooth enamel and land snail shells). Detrital Th contamination rendered Th/U dating analyses of flowstone unreliable. Recent 14C contamination produced spurious age-values from charcoal samples as well as from inadequately pretreated tooth samples. Most consistent 14C dates are grouped into two series: one between 35 and 40 ka and the other between 48 and 49 ka. Most ESR and AAR samples yielded concordant ages, ranging between 39 and 45 ka; OSL dating results permitted adequate bracketing of the sedimentary layer that contained the human remains. Our results emphasize the value of multi-dating approaches for the establishment of reliable chronologies of human remains. [source]

ROMAN WINDOW GLASS: A COMPARISON OF FINDINGS FROM THREE DIFFERENT ITALIAN SITES

ARCHAEOMETRY, Issue 2 2010
R. ARLETTI
Thirty-three samples of window glass and five glass lumps coming from three Italian archaeological sites,the Suasa excavations (Ancona, settled from the third century bc to the fifth to sixth centuries ad), the Roman town of Mevaniola (Forlì-Cesena, settled from the Imperial Age up to the fourth century ad) and Theodoric's Villa of Galeata (Forlì-Cesena, settled from the sixth century ad onwards),were analysed to track the changes in the chemical composition and manufacturing technology of window glass through the centuries. The aims of this study were: (1) to establish the origin of the raw materials; (2) to verify the chemical homogeneity among samples coming from different sites and/or produced using different techniques; and (3) to sort the samples into the compositional groups of ancient glass. The analysis of all the chemical variables allowed two groups to be distinguished: (a) finds from Mevaniola and Suasa; and (b) finds from Galeata. All the samples had a silica,soda,lime composition, but the analysis of minor elements,in particular, of Fe, Mn, and Ti,made it possible to split the samples into two groups, with the higher levels of these elements always found in the Galeata samples (HIMT glass). In conclusion, it can be asserted that the main differences between the samples are related to their chronology. [source]

PROVENANCE OF OBSIDIAN EXCAVATED FROM LATE CHALCOLITHIC LEVELS AT THE SITES OF TELL HAMOUKAR AND TELL BRAK, SYRIA*

ARCHAEOMETRY, Issue 6 2009
L. KHALIDI
X-ray fluorescence and laser ablation inductively coupled plasma mass spectrometry (LA,ICP,MS) analyses conducted on 40 obsidian samples from the Late Chalcolithic 2 levels at Tell Hamoukar and Tell Brak in north-east Syria have shown trends towards the exploitation of obsidian sources in the eastern Taurus. While the Bingöl region appears to provide the majority of obsidian to both sites, there is also evidence of more minor exploitation of a source in the Lake Van area and an altogether unknown source (X). This paper presents the data acquired from the analyses of the archaeological obsidian and situates these results within their chronological and regional contexts. [source]

FIXED-FREQUENCY RADIO-WAVE IMAGING OF SUBSURFACE ARCHAEOLOGICAL FEATURES: A MINIMALLY INVASIVE TECHNIQUE FOR STUDYING ARCHAEOLOGICAL SITES*

ARCHAEOMETRY, Issue 1 2005
L. SOMERS
In memoriam Tony Clark Sadly, this research marked the last field visit to the test site that the authors were able to share with their colleague Tony Clark. His enthusiasm, experience and encouragement inspired us to complete this project that, to many, must have appeared as grown men at play in a sand pit. A new approach to subsurface exploration has been developed, based on fixed-frequency radio-wave illumination from a buried transmitter. Data are collected from a buried, continuous wave source with a phase-coherent surface-scanning receiver and recorded in a digital archive from which images of the archaeological features are subsequently produced. An important feature of this approach is the opportunity to separate the data collection and archive functions, which form an uncompromised record of the site, from the more subjective image formation function. This paper reports the results of a feasibility assessment programme and discusses the future application of the method to real archaeological sites. [source]

SITEs revisited: Socioeconomic and demographic contours of small island tourist economies

Electronic States and Spectroscopic Properties of SiTe and SiTe+

CHEMINFORM, Issue 5 2007
Surya Chattopadhyaya
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]