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Principal components analysis

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https://www.readbyqxmd.com/read/28109088/antioxidant-evaluation-and-composition-analysis-of-extracts-from-fuzhuan-brick-tea-and-its-comparison-with-two-instant-tea-products
#1
Qing-An Zhang, Xiao-Li Zhang, Yan-Ying Yan, Xue-Hui Fan
In this paper, the antioxidant capacities and compositions of two commercialized tea products and extracts from Fuzhuanbrick tea (FBT) were investigated using three HPLC methods comparing the retention times of injected standards. Principal component analysis and DPPH-spiking HPLC analysis were used to analyze correlation between antioxidant capacity and the compounds detected to screen which compounds contribute to antioxidant activity. Results indicated that all samples contained high amounts of polysaccharides, phenols, and flavonoids and had good antioxidant activity and a high level of correlation among them...
January 21, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28108922/association-between-heavy-metal-and-metalloid-levels-in-topsoil-and-cancer-mortality-in-spain
#2
Olivier Núñez, Pablo Fernández-Navarro, Iván Martín-Méndez, Alejandro Bel-Lan, Juan F Locutura Rupérez, Gonzalo López-Abente
Spatio-temporal cancer mortality studies in Spain have revealed patterns for some tumours which display a distribution that is similar across the sexes and persists over time. Such characteristics would be common to tumours that shared risk factors, including the geochemical composition of the soil. The aim of this study was to assess the possible association between heavy metal and metalloid levels in topsoil (upper soil horizon) and cancer mortality in mainland Spain. Ecological cancer mortality study at a municipal level, covering 861,440 cancer deaths (27 different tumour locations) in 7917 Spanish mainland towns, from 1999 to 2008...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28108381/metabolomic-study-of-the-intervention-effects-of-shuihonghuazi-formula-a-traditional-chinese-medicinal-formulae-on-hepatocellular-carcinoma-hcc-rats-using-performance-hplc-esi-tof-ms
#3
Yongrui Bao, Shuai Wang, Xinxin Yang, Li Tianjiao, Mingyue Xia, Xiansheng Meng
ETHNOPHARMACOLOGICAL RELEVANCE: Metabolomics is the comprehensive assessment of endogenous metabolites of a biological system in a holistic context, and its property consists with the global view of Traditional Chinese Medicine (TCM). Shuihonghuazi Formula (SHHZF) has been used for liver cancer early treatment in clinical for more than thirty years, but its mechanism remains unclear completely. This paper was designed to explore the therapeutic effects of SHHZF on liver cancer and its metabolomic characters...
January 17, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28108378/the-pressure-induced-deformation-response-of-the-human-lamina-cribrosa-analysis-of-regional-variations
#4
Dan E Midgett, Mary E Pease, Joan L Jefferys, Mohak Patel, Christian Franck, Harry A Quigley, Thao D Nguyen
: The objective of this study was to measure the pressure-induced deformation response of the human lamina cribrosa (LC) and analyze for variations with age and anatomical region. The posterior scleral cup of 8 eyes from 6 human donors was mounted onto a custom inflation chamber. A laser-scanning microscope was used for second harmonic generation (SHG), imaging the collagen structure in the posterior volume of the LC at pressures from 5 mmHg to 45 mmHg. The SHG volumes were analyzed by the Fast-Fourier Iterative Digital Volume Correlation (DVC) algorithm for the three dimensional (3D) displacement field...
January 17, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28107954/headspace-fourier-transform-infrared-spectroscopy-for-the-differentiation-of-pandanus-species
#5
Kim Christopher C Aganda, Maribel G Nonato, Fortunato Sevilla, Karen S Santiago
Headspace Fourier Transform Infrared Spectroscopy (HS-FTIR) in tandem with chemometrics was applied to differentiate several species of the genus Pandanus. The headspace was generated from each Pandanus sample after incubation in a tightly sealed sample chamber. The resulting FTIR spectra of the headspace samples were found to be almost similar, but the application of principal component analysis (PCA) effectively differentiated the species. The unique spectral features for some samples were highlighted in the second-derivative FTIR spectra...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107875/risk-factors-associated-with-the-different-categories-of-piglet-perinatal-mortality-in-french-farms
#6
F Pandolfi, S A Edwards, F Robert, I Kyriazakis
We aimed to identify mortality patterns and to establish risk factors associated with different categories of piglet perinatal mortality in French farms. At farm level, the analyses were performed on data from 146 farms that experienced perinatal mortality problems. At piglet level, the analyses were performed on data from 155 farms (7761 piglets). All data were collected over a period of 10 years (2004-14) by a consulting company, using a non-probability sampling at farm level and a random sampling at sow level...
February 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28107716/occurrence-speciation-and-transportation-of-heavy-metals-in-9-coastal-rivers-from-watershed-of-laizhou-bay-china
#7
Li Xu, Tieyu Wang, Jihua Wang, Anxiang Lu
The occurrence, speciation and transport of heavy metals in 9 coastal rivers from watershed of Laizhou Bay were investigated. The largest dissolved concentrations of Cd, Cu and Zn in water were 6.26, 2755.00, 2076.00 μg/L, respectively, much higher than several drinking water guidelines. The greatest concentrations of Cu, Zn, Cr, Ni, Pb and Cd in sediments were 1462, 1602, 196, 67.2, 63.5 and 1.41 mg/kg, dw, respectively. Correlation and principal component analysis was also conducted to determine the extent between the concentrations of metals in water and sediment, as well as relevant parameters...
January 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107483/genetic-divergence-in-domestic-japanese-quail-inferred-from-mitochondrial-dna-d-loop-and-microsatellite-markers
#8
Mitsuo Nunome, Mikiharu Nakano, Ryo Tadano, Ryoka Kawahara-Miki, Tomohiro Kono, Shinji Takahashi, Takaharu Kawashima, Akira Fujiwara, Keijiro Nirasawa, Makoto Mizutani, Yoichi Matsuda
To assess the genetic diversity of domestic Japanese quail (Coturnix japonica) populations, and their genetic relationships, we examined mitochondrial DNA (mtDNA) D-loop sequences and microsatellite markers for 19 Japanese quail populations. The populations included nine laboratory lines established in Japan (LWC, Quv, RWN, WE, AWE, AMRP, rb-TKP, NIES-L, and W), six meat-type quail lines reimported from Western countries (JD, JW, Estonia, NIES-Br, NIES-Fr, and NIES-Hn), one commercial population in Japan, and three wild quail populations collected from three Asian areas...
2017: PloS One
https://www.readbyqxmd.com/read/28107400/when-contact-is-not-enough-affecting-first-year-medical-students-image-towards-older-persons
#9
Sasmita Kusumastuti, Esther van Fenema, Eugenie C F Polman-van Stratum, Wilco Achterberg, Jolanda Lindenberg, Rudi G J Westendorp
CONTEXT: Many medical schools have initiated care internships to familiarize their students with older persons and to instil a professional attitude. OBJECTIVE: To examine the impact of care internships on the image that first-year medical students have of older persons and to explore the underlying concepts that may play a role in shaping this image. DESIGN: Survey before and after a two-week compulsory care internship using the Aging Semantic Differential (ASD; 32 adjectives) and the Attitudes toward Old People (AOP; 34 positions) questionnaires...
2017: PloS One
https://www.readbyqxmd.com/read/28107009/nmr-and-computation-reveal-a-pressure-sensitive-folded-conformation-of-trp-cage
#10
Soichiro Kitazawa, Martin J Fossat, Scott A McCallum, Angel E Garcia, Catherine Ann Royer
Beyond defining the structure and stability of folded states of proteins, primary amino acid sequences determine all of the features of their conformational landscapes. Characterizing how sequence modulates the population of protein excited states or folding pathways requires atomic level detailed structural and energetic information. Such insight is essential for improving protein design strategies, as well as for interpreting protein evolution. Here, high pressure NMR and molecular dynamics simulations were combined to probe the conformational landscape of a small model protein, the tryptophan cage variant, Tc5b...
January 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28106816/nutrient-patterns-associated-with-fasting-glucose-and-glycated-haemoglobin-levels-in-a-black-south-african-population
#11
Tinashe Chikowore, Pedro T Pisa, Tertia van Zyl, Edith J M Feskens, Edelweiss Wentzel-Viljoen, Karin R Conradie
Type 2 diabetes (T2D) burden is increasing globally. However, evidence regarding nutrient patterns associated with the biomarkers of T2D is limited. This study set out to determine the nutrient patterns associated with fasting glucose and glycated haemoglobin the biomarkers of T2D. Factor analysis was used to derive nutrient patterns of 2010 participants stratified by urban/rural status and gender. Principal Component Analysis (PCA) was applied to 25 nutrients, computed from the quantified food frequency questionnaires (QFFQ)...
January 19, 2017: Nutrients
https://www.readbyqxmd.com/read/28106791/dietary-patterns-in-relation-to-cardiovascular-disease-incidence-and-risk-markers-in-a-middle-aged-british-male-population-data-from-the-caerphilly-prospective-study
#12
Elly Mertens, Oonagh Markey, Johanna M Geleijnse, David Ian Givens, Julie A Lovegrove
Dietary behaviour is an important modifiable factor in cardiovascular disease (CVD) prevention. The study aimed to identify dietary patterns (DPs) and explore their association with CVD incidence and risk markers. A follow-up of 1838 middle-aged men, aged 47-67 years recruited into the Caerphilly Prospective Cohort Study at phase 2 (1984-1988) was undertaken. Principal component analysis identified three DPs at baseline, which explained 24.8% of the total variance of food intake. DP1, characterised by higher intakes of white bread, butter, lard, chips and sugar-sweetened beverages and lower intake of wholegrain bread, was associated with higher CVD (HR 1...
January 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28106475/characterization-of-developmental-immature-fiber-im-mutant-and-texas-marker-1-tm-1-cotton-fibers-using-attenuated-total-reflection-fourier-transform-infrared-atr-ft-ir-spectroscopy
#13
Yongliang Liu, Hee-Jin Kim
The immature fiber ( im) mutant is one type of cotton fiber mutant with unique characteristics of non-fluffy cotton bolls. Compared to its near-isogenic wild type Texas Marker-1 (TM-1), im fiber has a thin secondary cell wall and is less mature. In this work, we applied the previously proposed principal component analysis (PCA) and simple algorithms to analyze the attenuated total reflection Fourier transform infrared (ATR FT-IR) spectra of developmental im and TM-1 fibers. The results from these approaches could not effectively and consistently indicate the inherent difference between TM-1 and im fibers at the same developmental stage...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28105970/classification-of-edible-oils-based-on-atr-ftir-spectral-information-during-a-long-heating-treatment
#14
Marjan Mahboubifar, Bahram Hemmateenejad, Saeed Yousefinejad
Identification of oil type and its QC are important concerns in food control laboratories. Classifying edible oils thathave not been used (i.e., unheated) with the aid of vibrational spectroscopy has previously been reported. However, the classification of used (i.e., heat-treated) oils needs special attention. The effect of long heating times on the classification of four kinds of edible oils (canola, corn, frying, and sunflower) based on attenuated total reflectance (ATR)-FTIR spectra was surveyed. The sampling was done on the oils during a 36 h heating process (at 170°C)...
January 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28105617/-establishment-of-prediction-model-of-acute-gastrointestinal-injury-classification-of-critically-ill-patients-based-on-digital-gastrointestinal-sounds-monitoring
#15
Yan Wang, Jianrong Wang, Weiwei Liu, Guangliang Zhang
OBJECTIVE: To develop the prediction model of acute gastrointestinal injury (AGI) classification of critically ill patients. METHODS: The binary channel gastrointestinal sounds (GIS) monitor system was used to gather and analyze the GIS of 60 consecutive critically ill patients who were admitted in Critical Care Medicine of PLA General Hospital from April 2015 to November 2015 (patients with chronic gastrointestinal disease or history of gastrointestinal surgery were excluded)...
January 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/28104516/influence-of-uv-lamp-sulfur-iv-concentration-and-ph-on-bromate-degradation-in-uv-sulfite-systems-mechanisms-and-applications
#16
Qian Xiao, Ting Wang, Shuili Yu, Peng Yi, Lei Li
Bromate (BrO3(-)) is a possible human carcinogen regulated worldwide at a strict standard of 10 μg/L in drinking water. Removal of BrO3(-) by advanced reduction processes (ARPs) has attracted much attention due to its high reduction efficiency and easier combination with ultraviolet (UV) disinfection. In this study, we employed a UV/sulfite process to degrade BrO3(-) and studied the effects of UV lamp, sulfur(IV) concentration, and pH on effectiveness of the system in degrading BrO3(-). Low-pressure UV lamps (UV-L) instead of medium-pressure UV lamps (UV-M) were selected because of the high ultraviolet-C (UV-C) efficiency of UV-L...
January 11, 2017: Water Research
https://www.readbyqxmd.com/read/28103876/the-norwegian-version-of-the-qolibri-a-study-of-metric-properties-based-on-a-12%C3%A2-month-follow-up-of-persons-with-traumatic-brain-injury
#17
Helene Lundgaard Soberg, Cecilie Roe, Cathrine Brunborg, Nicole von Steinbüchel, Nada Andelic
BACKGROUND: Consequences after Traumatic brain injury (TBI) affect the injured person's self-image and quality of life. The purpose was to assess the health related quality of life (HRQoL) at 12 months after a TBI in patients admitted to regional trauma centres, and to evaluate the metric properties of the Norwegian version of the Quality of Life After Brain Injury (QOLIBRI) questionnaire. METHODS: Two hundred four patients with TBI of all severities were included...
January 19, 2017: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/28103797/genetic-structure-in-the-sherpa-and-neighboring-nepalese-populations
#18
Amy M Cole, Sean Cox, Choongwon Jeong, Nayia Petousi, Dhana R Aryal, Yunden Droma, Masayuki Hanaoka, Masao Ota, Nobumitsu Kobayashi, Paolo Gasparini, Hugh Montgomery, Peter Robbins, Anna Di Rienzo, Gianpiero L Cavalleri
BACKGROUND: We set out to describe the fine-scale population structure across the Eastern region of Nepal. To date there is relatively little known about the genetic structure of the Sherpa residing in Nepal and their genetic relationship with the Nepalese. We assembled dense genotype data from a total of 1245 individuals representing Nepal and a variety of different populations resident across the greater Himalayan region including Tibet, China, India, Pakistan, Kazakhstan, Uzbekistan, Tajikistan and Kirghizstan...
January 19, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28103408/functional-planning-units-for-the-management-of-an-endangered-brazilian-titi-monkey
#19
Sidney F Gouveia, João Pedro Souza-Alves, Bruno B de Souza, Raone Beltrão-Mendes, Leandro Jerusalinsky, Stephen F Ferrari
Conservation practices in the tropics often rely on the data available for a few, better-known species and the adoption of an appropriate spatial scale. By defining a set of landscape units that account for critical aspects of the focal species, the information available on these conservation targets can support regional conservation policies. Here, we define and classify adjacent landscapes, termed planning units, to orientate management decisions within and among these landscapes, which are occupied by an endangered flagship primate species (Coimbra-Filho's titi monkey, Callicebus coimbrai) from eastern Brazil...
January 19, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28103242/genome-wide-binding-of-posterior-hoxa-d-transcription-factors-reveals-subgrouping-and-association-with-ctcf
#20
Ivana Jerković, Daniel M Ibrahim, Guillaume Andrey, Stefan Haas, Peter Hansen, Catrin Janetzki, Irene González Navarrete, Peter N Robinson, Jochen Hecht, Stefan Mundlos
Homeotic genes code for key transcription factors (HOX-TFs) that pattern the animal body plan. During embryonic development, Hox genes are expressed in overlapping patterns and function in a partially redundant manner. In vitro biochemical screens probing the HOX-TF sequence specificity revealed largely overlapping sequence preferences, indicating that co-factors might modulate the biological function of HOX-TFs. However, due to their overlapping expression pattern, high protein homology, and insufficiently specific antibodies, little is known about their genome-wide binding preferences...
January 19, 2017: PLoS Genetics
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