bluuebunny/crossref_metadata_2025_split huggingface dataset:
The profiling and identification of the metabolites of 8‐prenylkaempferol and a study on their distribution in rats by high‐performance liquid chromatography with diode array detection combined with electrospray ionization ion trap time‐of‐flight multistage mass spectrometry
Authors: Ma Li‐Man , Xu Feng , Li Feng‐Chun , Wang Jing‐Zhe , Shang Ming‐Ying , Liu Guang‐Xue , Cai Shao‐Qing 
Published: June 2015

Abstract8‐Prenylkaempferol is a prenylflavonoid that has various bioactivities and benefits for human health. A high‐performance liquid chromatography with a diode array detector combined with electrospray ionization ion trap time‐of‐flight multistage mass spectrometry (HPLC‐DAD‐ESI‐IT‐TOF‐MSn) method was established to profile and identify the metabolites of 8‐prenylkaempferol in rat in vivo and in vitro, and to study the distribution of these metabolites in rats for the first time. A total of 38 metabolites were detected and tentatively identified, 30 of which were identified as new compounds. The new in vivo metabolic reactions in rats of prenylflavonoids of isomerization, polymerization, sulfation, amino acid conjugation, vitamin C conjugation and other known metabolic reactions were found in the metabolism of 8‐prenylkaempferol. The numbers of detected metabolites in feces, urine, plasma, small intestine, stomach, kidneys, liver, heart, lungs, spleen and hepatic S9 fraction were 31, 19, 1, 20, 13, 8, 7, 3, 3, 1 and 11, respectively. This indicated that small intestine and stomach were the major organs in which the 8‐prenylkaempferol metabolites were distributed. Furthermore, 16 metabolites were determined to have bioactivities based on the literature and ‘PharmMapper’ analysis. These findings are useful for better comprehension of the effective forms, target organs and pharmacological actions of 8‐prenylkaempferol. Moreover, they provide a reference for the study of the metabolism and distribution of prenylflavonoid aglycone compounds. Copyright © 2015 John Wiley & Sons, Ltd.
Regional variability in dust‐on‐snow processes and impacts in the Upper Colorado River Basin
Authors: Skiles S. McKenzie , Painter Thomas H. , Belnap Jayne , Holland Lacey , Reynolds Richard L. , Goldstein Harland L. , Lin John 
Published: June 2015

AbstractDust deposition onto mountain snow cover in the Upper Colorado River Basin frequently occurs in the spring when wind speeds and dust emission peaks on the nearby Colorado Plateau. Dust loading has increased since the intensive settlement in the western USA in the mid 1880s. The effects of dust‐on‐snow have been well studied at Senator Beck Basin Study Area (SBBSA) in the San Juan Mountains, CO, the first high‐altitude area of contact for predominantly southwesterly winds transporting dust from the southern Colorado Plateau. To capture variability in dust transport from the broader Colorado Plateau and dust deposition across a larger area of the Colorado River water sources, an additional study plot was established in 2009 on Grand Mesa, 150 km to the north of SBBSA in west central, CO. Here, we compare the 4‐year (2010–2013) dust source, deposition, and radiative forcing records at Grand Mesa Study Plot (GMSP) and Swamp Angel Study Plot (SASP), SBBSA's subalpine study plot. The study plots have similar site elevations/environments and differ mainly in the amount of dust deposited and ensuing impacts. At SASP, end of year dust concentrations ranged from 0.83 mg g−1 to 4.80 mg g−1, and daily mean spring dust radiative forcing ranged from 50–65 W m−2, advancing melt by 24–49 days. At GMSP, which received 1.0 mg g−1 less dust per season on average, spring radiative forcings of 32–50 W m−2 advanced melt by 15–30 days. Remote sensing imagery showed that observed dust events were frequently associated with dust emission from the southern Colorado Plateau. Dust from these sources generally passed south of GMSP, and back trajectory footprints modelled for observed dust events were commonly more westerly and northerly for GMSP relative to SASP. These factors suggest that although the southern Colorado Plateau contains important dust sources, dust contributions from other dust sources contribute to dust loading in this region, and likely account for the majority of dust loading at GMSP. Copyright © 2015 John Wiley & Sons, Ltd.
Multiscale Predictors of Femoral Neck In Situ Strength in Aging Women: Contributions of BMD, Cortical Porosity, Reference Point Indentation, and Nonenzymatic Glycation
Authors: Abraham Adam C , Agarwalla Avinesh , Yadavalli Aditya , McAndrew Christopher , Liu Jenny Y , Tang Simon Y 
Published: June 2015

ABSTRACT

The diagnosis of fracture risk relies almost solely on quantifying bone mass, yet bone strength is governed by factors at multiple scales including composition and structure that contribute to fracture resistance. Furthermore, aging and conditions such as diabetes mellitus alter fracture incidence independently of bone mass. Therefore, it is critical to incorporate other factors that contribute to bone strength in order to improve diagnostic specificity of fracture risk. We examined the correlation between femoral neck fracture strength in aging female cadavers and areal bone mineral density, along with other clinically accessible measures of bone quality including whole-bone cortical porosity (Ct.Po), bone material mechanical behavior measured by reference point indentation (RPI), and accumulation of advanced glycation end-products (AGEs). All measurements were found to be significant predictors of femoral neck fracture strength, with areal bone mineral density (aBMD) being the single strongest correlate (aBMD: r = 0.755, p &lt; 0.001; Ct.Po: r = –0.500, p &lt; 0.001; RPI: r = –0.478, p &lt; 0.001; AGEs: r = –0.336, p = 0.016). RPI-derived measurements were not correlated with tissue mineral density or local cortical porosity as confirmed by micro–computed tomography (μCT). Multiple reverse stepwise regression revealed that the inclusion of aBMD and any other factor significantly improve the prediction of bone strength over univariate predictions. Combining bone assays at multiple scales such as aBMD with tibial Ct.Po (r = 0.835; p &lt; 0.001), tibial difference in indentation depth between the first and 20th cycle (IDI) (r = 0.883; p &lt; 0.001), or tibial AGEs (r = 0.822; p &lt; 0.001) significantly improves the prediction of femoral neck strength over any factor alone, suggesting that this personalized approach could greatly enhance bone strength and fracture risk assessment with the potential to guide clinical management strategies for at-risk populations. © 2015 American Society for Bone and Mineral Research.
Reexamining the Surfaces of Bone in Boys and Girls During Adolescent Growth: A 12-Year Mixed Longitudinal pQCT Study
Authors: Gabel Leigh , Nettlefold Lindsay , Brasher Penelope M , Moore Sarah A , Ahamed Yasmin , Macdonald Heather M , McKay Heather A 
Published: June 2015

ABSTRACT

We revisit Stanley Garn's theory related to sex differences in endocortical and periosteal apposition during adolescence using a 12-year mixed longitudinal study design. We used peripheral quantitative computed tomography to examine bone parameters in 230 participants (110 boys, 120 girls; aged 11.0 years at baseline). We assessed total (Tt.Ar, mm2), cortical (Ct.Ar, mm2), and medullary canal area (Me.Ar, mm2), Ct.Ar/Tt.Ar, cortical bone mineral density (Ct.BMD, mg/cm3), and polar strength-strain index (SSIp, mm3) at the tibial midshaft (50% site). We used annual measures of height and chronological age to identify age at peak height velocity (APHV) for each participant. We compared annual accrual rates of bone parameters between boys and girls, aligned on APHV using a linear mixed effects model. At APHV, boys demonstrated greater Tt.Ar (ratio = 1.27; 95% confidence interval [CI] 1.21, 1.32), Ct.Ar (1.24 [1.18, 1.30]), Me.Ar (1.31 [1.22, 1.40]), and SSIp (1.36 [1.28, 1.45]) and less Ct.Ar/Tt.Ar (0.98 [0.96, 1.00]) and Ct.BMD (0.97 [0.96, 0.97]) compared with girls. Boys and girls demonstrated periosteal bone formation and net bone loss at the endocortical surface. Compared with girls, boys demonstrated greater annual accrual rates pre-APHV for Tt.Ar (1.18 [1.02, 1.34]) and Me.Ar (1.34 [1.11, 1.57]), lower annual accrual rates pre-APHV for Ct.Ar/Tt.Ar (0.56 [0.29, 0.83]) and Ct.BMD (–0.07 [–0.17, 0.04]), and similar annual accrual rates pre-APHV for Ct.Ar (1.10 [0.94, 1.26]) and SSIp (1.14 [0.98, 1.30]). Post-APHV, boys demonstrated similar annual accrual rates for Ct.Ar/Tt.Ar (1.01 [0.71, 1.31]) and greater annual accrual rates for all other bone parameters compared with girls (ratio = 1.23 to 2.63; 95% CI 1.11 to 3.45). Our findings support those of Garn and others of accelerated periosteal apposition during adolescence, more evident in boys than girls. However, our findings challenge the notion of greater endocortical apposition in girls, suggesting instead that girls experience diminished endocortical resorption compared with boys. © 2015 American Society for Bone and Mineral Research.
A Novel Danshensu Derivative Prevents Cardiac Dysfunction and Improves the Chemotherapeutic Efficacy of Doxorubicin in Breast Cancer Cells
Authors: Wang Liang , Zhang Xiaojing , Chan Judy Yuet‐Wa , Shan Luchen , Cui Guozhen , Cui Qingbin , Wang Yingfei , Li Jingjing , Chen Huanxian , Zhang Qingwen , Yu Pei , Han Yifan , Wang Yuqiang , Lee Simon Ming‐Yuen 
Published: June 2015

ABSTRACTDoxorubicin (Dox) is an anthracycline antibiotic widely used in clinics as an anticancer agent. However, the use of Dox is limited by its cardiotoxicity. We have previously shown that a Danshensu (DSS) derivative, ADTM, displayed strong cardioprotective effects. With improved chemical stability and activity, a novel DSS derivative, D006, based on the structure of ADTM, was synthesized. In the present study, the protective effects of D006, indexed by attenuation of the cardiotoxicity induced by Dox as well as chemosensitizing effects that increase the antitumor activity of Dox, were investigated. Our results showed that D006 was more potent than either parental compound, or their use in combination, in ameliorating Dox‐induced toxicity in H9c2 cells. In our zebrafish model, D006, but not DSS, alone significantly preserved the ventricular function of zebrafish after Dox treatment. Moreover, D006 upregulated mitochondrial biogenesis and increased mtDNA copy number after Dox treatment of H9c2 cells. D006 promoted the expression of HO‐1 protein in a time‐dependent manner while the HO‐1 inhibitor, Znpp, reversed the protective effects of D006. In human breast tumor MCF‐7 cells, D006 enhanced Dox‐induced cytotoxicity by increasing apoptosis. In conclusion, our results indicate that a new DSS derivative exhibits promising protective effects against Dox‐induced cardiotoxicity both in vivo and in vitro, an effect at least partially mediated by induction of HO‐1 expression and the activation of mitochondrial biogenesis. Meanwhile, D006 also potentiated the anti‐cancer effects of Dox in breast tumor cells. J. Cell. Biochem. 117: 94–105, 2016. © 2015 Wiley Periodicals, Inc.
Atmospheric ions and new particle formation events at a tropical location, Pune, India
Authors: Kamra A. K. , Siingh Devendraa , Gautam A. S. , Kanawade V. P. , Tripathi S. N. , Srivastava A. K. 
Published: June 2015

Characteristics of small, intermediate and large ions and nanometre particles, and the influences of environmental conditions and local topography on the interactions of these ions and particles in the size range of 3.85–47.8 nm diameter are studied during new particle formation (NPF) events observed at Pune, India from 20 March to 23 May 2012. During the NPF events, the formation rate of 5 nm particles ranged from 3.5 to 13.9 cm−3 s−1and growth rates of both positive and negative ions were greater than those of neutral particles. Total ion concentrations in this size range were approximately double on event days than on non‐event days. The NPF events were generally preceded by 2–3 h periods of enhanced concentration of ions and aerosols (PECIA) which are associated with katabatic winds from the surrounding hill‐slopes at our site. During PECIA, ions ≤8 nm diameter grew faster and attained mode diameters greater than those of neutral particles. PECIA provided the ions of sub‐8 nm diameter and dramatically reduced the condensation sinks and thus contributed to the development of conditions conducive for NPF. During PECIA, total concentrations of the ions and particles become almost equal and the Boltzmann charge distribution breaks down. During NPF events, mode diameters of the ions and particles first steeply decreased accompanied by a steep increase in condensation sink but later gradually increased at identical rates.Observations of charging ratio of 3–4 nm particles being higher than the charge equilibrium value and non‐observation of charge equilibrium for >5 nm ions and particles indicate occurrence of ion nucleation and/or advection during the PECIA.
SWI/SNF-Mediated Lineage Determination in Mesenchymal Stem Cells Confers Resistance to Osteoporosis
Authors: Nguyen Kevin Hong , Xu Fuhua , Flowers Stephen , Williams Edek A.J. , Fritton J. Christopher , Moran Elizabeth 
Published: June 2015

Abstract
Redirecting the adipogenic potential of bone marrow-derived mesenchymal stem cells to other lineages, particularly osteoblasts, is a key goal in regenerative medicine. Controlling lineage selection through chromatin remodeling complexes such as SWI/SNF, which act coordinately to establish new patterns of gene expression, would be a desirable intervention point, but the requirement for the complex in essentially every lineage pathway has generally precluded selectivity. However, a novel approach now appears possible by targeting the subset of SWI/SNF powered by the alternative ATPase, mammalian brahma (BRM). BRM is not required for development, which has hindered understanding of its contributions, but knockdown genetics here, designed to explore the hypothesis that BRM-SWI/SNF has different regulatory roles in different mesenchymal stem cell lineages, shows that depleting BRM from mesenchymal stem cells has a dramatic effect on the balance of lineage selection between osteoblasts and adipocytes. BRM depletion enhances the proportion of cells expressing markers of osteoblast precursors at the expense of cells able to differentiate along the adipocyte lineage. This effect is evident in primary bone marrow stromal cells as well as in established cell culture models. The altered precursor balance has major physiological significance, which becomes apparent as protection against age-related osteoporosis and as reduced bone marrow adiposity in adult BRM-null mice. Stem Cells 2015;33:3028–3038
Core Pluripotency Factors Directly Regulate Metabolism in Embryonic Stem Cell to Maintain Pluripotency
Authors: Kim Hyunsoo , Jang Hyonchol , Kim Tae Wan , Kang Byung-Hee , Lee Sang Eun , Jeon Yoon Kyung , Chung Doo Hyun , Choi Jinmi , Shin Jihoon , Cho Eun-Jung , Youn Hong-Duk 
Published: June 2015

AbstractPluripotent stem cells (PSCs) have distinct metabolic properties that support their metabolic and energetic needs and affect their stemness. In particular, high glycolysis is critical for the generation and maintenance of PSCs. However, it is unknown how PSCs maintain and acquire this metabolic signature. In this study, we found that core pluripotency factors regulate glycolysis directly by controlling the expression of glycolytic enzymes. Specifically, Oct4 directly governs Hk2 and Pkm2, which are important glycolytic enzymes that determine the rate of glycolytic flux. The overexpression of Hk2 and Pkm2 sustains high levels of glycolysis during embryonic stem cell (ESC) differentiation. Moreover, the maintenance of high glycolysis levels by Hk2 and Pkm2 overexpression hampers differentiation and preserves the pluripotency of ESCs in the absence of leukemia inhibitory factor. Overall, our study identifies a direct molecular connection between core pluripotency factors and ESC metabolic signatures and demonstrates the significance of metabolism in cell fate determination. Stem Cells 2015;33:2699–2711
Technology and trust: older people's perspectives of a home monitoring system
Authors: LIE MABEL L. S. , LINDSAY STEPHEN , BRITTAIN KATIE 
Published: June 2015

ABSTRACTWith demographic changes and the growing numbers of older people living alone, concerns have been raised about the care of the ageing population. Increasingly, developments in technology are being seen as the solution to these concerns. For those who do not see themselves as old or frail enough to require personal care provision, and who prefer to maintain their identity as autonomous and independent individuals, the development of assistive technologies such as ambient home monitoring systems is one answer. However, this involves careful negotiations with older people's understandings of safety and privacy, and their experiences and relationships with technology, their carers and relevant service-providers. In two trials of a home monitoring system funded by the United Kingdom Technology Strategy Board, older people were interviewed pre-trial and post-trial about their perspectives on these issues. This paper presents a conceptual analysis of the qualitative data using a sociological framework of trust that considers habitual action, and relationships with kin and with wider institutions. The research found that older people's habits and norms do not need to be disrupted by the ambient system. What was of more importance was relationships between the older person and her or his ‘monitor’ based on trust, as well as institutional providers who need to instil or earn trust.
The role of the local retail food environment in fruit, vegetable and sugar-sweetened beverage consumption in Brazil
Authors: Duran Ana Clara , de Almeida Samuel Luna , Latorre Maria do Rosario DO , Jaime Patricia Constante 
Published: June 2015

AbstractObjectiveTo examine the relationship between the local retail food environment and consumption of fruits and vegetables (FV) and sugar-sweetened beverages (SSB) in São Paulo, Brazil, as well as the moderation effects of income in the studied relationships.DesignCross-sectional study design that drew upon neighbourhood- and individual-level data. For each participant, community (density and proximity) and community food environment (availability, variety, quality and price) measures of FV and SSB were assessed in retail food stores and specialized fresh produce markets within 1·6 km of their homes. Poisson generalized estimating equations (GEE) were used to model the associations of food consumption with food environment measures, adjusted by individual-level characteristics.SettingSão Paulo, Brazil.SubjectsAdults (n 1842) residing in the same census tracts (n 52) in São Paulo, Brazil as those where the neighbourhood-level measures were taken.ResultsFV availability in neighbourhoods was associated with regular FV consumption (≥5 times/week; prevalence ratio=1·41; 95 % CI 1·19, 1·67). Regular FV consumption prevalence was significantly lower among lower-income individuals living in neighbourhoods with fewer supermarkets and fresh produce markets (P-interaction <0·05). A greater variety of SSB was associated with a 15 % increase in regular SSB consumption (≥5 times/week) prevalence, after adjustment for confounding variables.ConclusionsOur findings suggest that the local retail food environment is associated with FV and SSB consumption in a Brazilian urban sample.
A Dictionary Approach to Electron Backscatter Diffraction Indexing
Authors: Chen Yu H. , Park Se Un , Wei Dennis , Newstadt Greg , Jackson Michael A. , Simmons Jeff P. , De Graef Marc , Hero Alfred O. 
Published: June 2015

AbstractWe propose a framework for indexing of grain and subgrain structures in electron backscatter diffraction patterns of polycrystalline materials. We discretize the domain of a dynamical forward model onto a dense grid of orientations, producing a dictionary of patterns. For each measured pattern, we identify the most similar patterns in the dictionary, and identify boundaries, detect anomalies, and index crystal orientations. The statistical distribution of these closest matches is used in an unsupervised binary decision tree (DT) classifier to identify grain boundaries and anomalous regions. The DT classifies a pattern as an anomaly if it has an abnormally low similarity to any pattern in the dictionary. It classifies a pixel as being near a grain boundary if the highly ranked patterns in the dictionary differ significantly over the pixel’s neighborhood. Indexing is accomplished by computing the mean orientation of the closest matches to each pattern. The mean orientation is estimated using a maximum likelihood approach that models the orientation distribution as a mixture of Von Mises–Fisher distributions over the quaternionic three sphere. The proposed dictionary matching approach permits segmentation, anomaly detection, and indexing to be performed in a unified manner with the additional benefit of uncertainty quantification.
Monitoring host responses to the gut microbiota
Authors: Lichtman Joshua S , Sonnenburg Justin L , Elias Joshua E 
Published: June 2015

Abstract
The gastrointestinal (GI) ecosystem is increasingly understood to be a fundamental component of health, and has been identified as a new focal point for diagnosing, correcting and preventing countless disorders. Shotgun DNA sequencing has emerged as the dominant technology for determining the genetic and microbial composition of the gut microbiota. This technology has linked microbiota dysbioses to numerous GI diseases including inflammatory bowel disease, obesity and allergy, and to non-GI diseases like autism and depression. The importance of establishing causality in the deterioration of the host–microbiota relationship is well appreciated; however, discovery of candidate molecules and pathways that underlie mechanisms remains a major challenge. Targeted approaches, transcriptional assays, cytokine panels and imaging analyses, applied to animals, have yielded important insight into host responses to the microbiota. However, non-invasive, hypothesis-independent means of measuring host responses in humans are necessary to keep pace with similarly unbiased sequencing efforts that monitor microbes. Mass spectrometry-based proteomics has served this purpose in many other fields, but stool proteins exist in such diversity and dynamic range as to overwhelm conventional proteomics technologies. Focused analysis of host protein secretion into the gut lumen and monitoring proteome-level dynamics in stool provides a tractable route toward non-invasively evaluating dietary, microbial, surgical or pharmacological intervention efficacies. This review is intended to guide GI biologists and clinicians through the methods currently used to elucidate host responses in the gut, with a specific focus on mass spectrometry-based shotgun proteomics applied to the study of host protein dynamics within the GI ecosystem.