Introduction: the issue of duplicates.

The permanent preservation of objects in global custodianship is a captivating ideal that informs countless museums' corporate identities and governs collection guidelines as well as politics. Recent research has challenged the alleged perpetuity of collections and collected items, revealing their coherence as fragile and dependent on historically, politically and culturally specific conditions. Duplicates offer an instructive point of entry to explore the idea of collection permanence, museum politics, and the mobility of museum objects.

Contested duplicates: disputed negotiations surrounding ethnographic doppelgängers in German New Guinea, 1898-1914.

The issue of duplicates and duplication in ethnographic collection is frequently regarded as a process that begins and ends in the museum as a fundamental act of the process of curating. In contrast, this article maintains, this practice occurred all along the chain of collecting, where indigenous artefacts operated as items of exchange in the context of the colonial encounter. Using the example of German New Guinea, the article maintains that epistemological concerns, as symbolic currency both in terms of inter-museum exchange and in terms of contributing to individual and institutional prestige, guiding ethnographic intuitions had little influence on colonial resident collectors.

A NEIGHBORHOOD-LEVEL POTENTIAL HEALTH IMPACT SCORING TOOL TO SUPPORT LOCAL-LEVEL HEALTH IMPACT ASSESSMENTS.

Health Impact Assessments (HIAs) have quickly become a widely utilized tool for integrating health and health-related evidence and data into decision making processes across a range of projects and polices. Integrating and utilizing the wide range of available data can be daunting. To support communities seeking to engage in health impact assessments, we developed the Neighborhood Potential Health Impact Score (NPHIS) methodology.

The utility of a system dynamics approach for understanding cumulative health risk from exposure to environmental hazards.

The potential of system dynamics modeling to advance our understanding of cumulative risk in the service of optimal health is discussed. The focus is on exploring system dynamics modeling as a systems science methodology that can provide a framework for examining the complexity of real-world social and environmental exposures among populations-particularly those exposed to multiple disparate sources of risk. The discussion also examines how system dynamics modeling can engage a diverse body of key stakeholders throughout the modeling process, promoting the collective assessment of assumptions and systematic gathering of critical data.

Pentadiynylidene and Its Methyl-Substituted Derivates: Threshold Photoelectron Spectroscopy of R-C-R Triplet Carbon Chains.

Mass-selective threshold photoelectron spectroscopy in the gas phase was employed to characterize the dialkynyl triplet carbenes pentadiynylidene (HCH), methylpentadiynylidene (MeCH), and dimethylpentadiynylidene (MeCMe). Diazo compounds were employed as precursors to generate the carbenes by flash pyrolysis. The R-C-R carbon chains were photoionized by vacuum ultraviolet (VUV) synchrotron radiation in photoelectron photoion coincidence (PEPICO) experiments.

Stress and health behaviors as potential mediators of the relationship between neighborhood quality and allostatic load.

Purpose: Neighborhood quality is associated with health. Increasingly, researchers are focusing on the mechanisms underlying that association, including the role of stress, risky health behaviors, and subclinical measures such as allostatic load (AL).

Methods: This study uses mixed-effects regression modeling to examine the association between two objective measures and one subjective measure of neighborhood quality and AL in an ethnically diverse population-based sample (N = 2706) from a medium-sized Texas city.

Subjective neighborhood assessment and physical inactivity: An examination of neighborhood-level variance.

Research suggests a linkage between perceptions of neighborhood quality and the likelihood of engaging in leisure-time physical activity. Often in these studies, intra-neighborhood variance is viewed as something to be controlled for statistically. However, we hypothesized that intra-neighborhood variance in perceptions of neighborhood quality may be contextually relevant.

Firearm carrying and concurrent substance use behaviours in a community-based sample of emerging adults.

Introduction: This paper examines associations between high-risk gun carrying and substance use in emerging adults (ages 18-22). The coexistence of these high-risk behaviours in a general population of emerging adults can have disastrous consequences.

Methods: Dating it Safe is an ongoing longitudinal (2010-2016) survey of emerging adults recruited from seven high schools in five south-east Texas-area school districts (current sample n=684).

[Residues of tetracycline and quinolones in wild fish living around a salmon aquaculture center in Chile].

The presence of residues of tetracycline, quinolones and antiparasitic drugs was investigated in wild fish captured around salmon aquaculture pens in Cochamó, Region X, Chile. Residues of both antibiotics were found in the meta [corrected] of two species of wild fish that are consumed by humans, robalo (Elginops maclovinus) and cabrilla (Sebastes capensis) [corrected] These findings suggest that the antibiotic usage in salmon aquaculture in Chile has nvironmental implications that may affect human and animal health. More studies are needed in Chile to determine the relevance of these findings for human and animal health and the environment to regulate this use of antibiotics.

Isomer abundance of bis(beta-diketonato) complexes of titanium(IV). Crystal structures of the antitumor compound budotitane [Ti(IV)(bzac)(2)(OEt)(2)] and of its dichloro-derivative [Ti(IV)(bzac)(2)Cl(2)] (bzac=1-phenylbutane-1,3-dionate).

The molecular tumor inhibiting titanium compound budotitane [Ti(IV)(bzac)(2)(OEt)(2)] (1) and its dichloro-derivative [Ti(IV)(bzac)(2)Cl(2)] (2) (bzac=1-phenylbutane-1,3-dionate) have been crystallized and characterized by X-ray crystallography and further physical methods. Budotitane (1) crystallizes in the tetragonal, non-centrosymmetric space group P4(1) with two molecules in the asymmetric unit. Both molecules adopt the cis-cis-trans configuration with the acetyl ends of the benzoylacetonate ligands in the trans position.

Prognostic histomorphometry in colorectal adenocarcinoma.

In order to examine the use of morphometry in the prognosis of colorectal adenocarcinoma, histologic material from 30 patients was analyzed. The volume-weighted nuclear volume (Vvnuclei), mean nucleolar diameters (dnucleoli) and their standard deviation (snucleoli) were determined in each case. These variables were compared between patients who died of the disease and those who did not.

Identification of Charcot-Leyden crystals by electron microscopy.

Observations of the ultrastructure of Charcot-Leyden crystals are sporadic in the literature. These crystals appear occasionally in clinical materials, however, and may pose diagnostic dilemmas if not correctly identified. Two cases in which unusual crystallike structures were seen on electron micrographs of specimens were evaluated for diagnostic purposes.

Nucleolar prominence as a diagnostic variable in prostatic carcinoma.

The diagnosis of well-differentiated adenocarcinoma of the prostate can be difficult on needle biopsy specimens. Nucleolar prominence has proven to be a useful diagnostic variable, but its objective evaluation has had limited study. To find nucleolar criteria that might differentiate benign from malignant conditions, we examined 41 open prostatectomy specimens, 25 of which were removed for well-differentiated adenocarcinoma and 16 of which were removed for benign prostatic hypertrophy (BPH).

Effects of hypercalcemia-producing tumor extract and parathyroid hormone on osteoclast ultrastructure.

Hypercalcemia is a frequent complication of cancer. Recently, parathyroid hormone-related protein has been isolated from tumors associated with this syndrome. In the present study, the effects of tumor-derived hypercalcemic factor and bovine parathyroid hormone (PTH) on bone were compared in an organ culture system using calvarial bones from newborn mice.

Comparison of intralobar non-parenchyma, subcapsular non-parenchyma, and liver capsule thickness.

The intralobar and subcapsular areas of human liver were compared in terms of morphometry and morphology, and a correlation was made between the thickness of liver capsules and the amount of intralobar non-parenchyma in normal and diseased livers. Tissue was systematically sampled from 16 normal and 26 fibrotic livers taken at necropsy. The volume fraction of subcapsular and intralobar non-parenchyma and the capsule thickness were determined by morphometry on histological sections.

Morphometry of liver parenchyma in needle biopsy specimens from patients with alcoholic liver disease: preliminary variables for the diagnosis and prognosis of cirrhosis.

The diagnosis of liver cirrhosis depends on assessing fibrosis and architectural alterations of the liver. In a needle biopsy specimen the connective tissue is often inadequately sampled, which leads to an uncertain diagnosis. Parenchymal features alone are currently insufficient.

Hepatic structural correlates of liver fibrosis: a morphometric analysis.

Liver fibrosis is an important feature of many liver diseases, and the assessment of fibrosis is essential for diagnosis and prognosis. Liver needle biopsy, however, tends to sample preferentially the soft parenchyma, which poorly reflects the true extent of fibrosis. Therefore, we have searched for capsule and parenchymal features that are correlated with the fibrosis.

Transluminal expandable nitinol coil stent grafting: preliminary report.

A method is described for the percutaneous catheter placement of expandable nitinol coil stents for the nonoperative restoration and maintenance of patency in internal flow pathways, especially the lumina of blood vessels and biliary ducts.

Morphometry of the small intestinal enterocytes of the fasted rat and the effects of colchicine.

The function of the microtubules that are present in the villus enterocytes of the mammalian small intestine is virtually unknown. In order to advance our knowledge about enterocyte microtubules, a quantitative ultrastructural comparison was carried out on enterocytes from rats injected intraperitoneally with colchicine (0.5 mg/100 g body weight) in saline and from rats injected with saline alone.

A morphometric analysis of the hypertrophy of experimental liver cirrhosis.

The objective of this study was to better elucidate the composition of the hypertrophic cirrhotic liver. We induced cirrhosis with hypertrophy in rats by simultaneous treatment with CCl4 and phenobarbital (PB) and devised a hierarchy of structure applicable to the sampling and morphometric analysis of untreated and PB-treated control livers and of cirrhotic livers. Our analysis demonstrated that the hepatomegaly attributable to cirrhosis is virtually the total result of an increase in the specific volume (ml/100 g body weight) of the non-parenchyma, most of which is connective tissue and vascular lumen volume.

Electron microscopic identity of talc in the liver of a narcotic addict.

In this report we identify the ultrastructural correlate of birefringent crystals that we found in biopsy specimens from an intravenous drug addict and that were presumed to be talc. By electron microscopy the crystals were electron dense and elongated with sharp edges and had an apparent lamination. The crystals were found within portal or granuloma macrophages and were often displaced or associated with section tears and knife marks.