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  • 1
    Language: English
    In: Animal Behaviour, April 2012, Vol.83(4), pp.891-903
    Description: In mammals, maternal care is essential for offspring survival, yet individual differences in this care can dramatically affect offspring growth and development. Few studies have, however, investigated the sources, magnitude and consequences of naturally occurring interindividual variation in maternal care during the neonatal period. In this study, we examine several hormonal and nonhormonal predictors of naturally occurring variation in the mother–neonate relationship during the first 8 weeks of infancy in 34 wild baboon ( ) mother–infant dyads in Amboseli, Kenya. We use data on physical contact and suckling patterns to assess the quality of the mother–neonate relationship and to evaluate the extent to which variation in this relationship is predictable from perinatal ovarian steroids (i.e. faecal oestrogen and progesterone metabolites), previous infant care experience, maternal dominance rank and offspring sex. We found that newborn infants of more experienced mothers initiated higher rates of changes in mother–infant contact than newborns of less experienced mothers. However, at each level of maternal experience, newborn males initiated higher rates of changes in mother–infant contact than newborn females. Moreover, we found evidence suggesting that variation in suckling activity among daughters (but not sons) was predictable from maternal dominance rank and faecal oestrogen (fE) concentrations before birth. To our knowledge, our study provides the first evidence of (1) the influence of cumulative maternal experience on the mother–infant relationship and (2) the emergence of sex differences in the mother–infant relationship during the neonatal period in wild primates. Our results suggest that the well-documented sex differences in life history, behaviour and ecology in primates (and other social mammals) may originate very early in life. ► We studied causes of variability in the mother–neonate relationship in wild baboons. ► The more experience a mother had, the more initiative her newborn infant exhibited. ► At each level of maternal experience, sons exhibited more initiative than daughters. ► Suckling by daughters was predicted from maternal rank and prenatal oestrogens. ► Our results suggest sex differences in primate life history emerge early in infancy.
    Keywords: Infant Independence ; Maternal Care ; Neonatal Sex Differences ; Sexual Dimorphism ; Veterinary Medicine ; Zoology ; Psychology
    ISSN: 0003-3472
    E-ISSN: 1095-8282
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  • 2
    Language: English
    In: Journalism & Mass Communication Quarterly, Spring, 2010, Vol.87(1), p.100(17)
    Description: The present study proposes a model of agenda diffusion as an explanation for inconsistencies in agenda-setting research. We suggest that interpersonal communication plays a pivotal role in a two-step process in which the media agenda diffuses first from the mass media to media users, and then from these via interpersonal communication to nonusers. We present findings from a field study to provide empirical evidence for the reality of agenda diffusion and discuss theoretical, analytical, and methodological implications for further agenda-setting research. (Author abstract)
    Keywords: Information Management -- Methods ; Interpersonal Communication -- Methods ; Media Literacy -- Methods
    ISSN: 1077-6990
    Source: Cengage Learning, Inc.
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  • 3
    In: Acta Paediatrica, May 2017, Vol.106(5), pp.749-754
    Description: Byline: Nga Nguyen, Laurent Vandenbroucke, Alfredo Hernandez, Tu Pham, Alain Beuchee, Patrick Pladys Keywords: Heart rate; Heart rate variability; Neonatal sepsis; Newborn infant; Signal processing Abstract Aim This study examined the heart rate variability characteristics associated with early-onset neonatal sepsis in a prospective, observational controlled study. Methods Eligible patients were full-term neonates hospitalised with clinical signs that suggested early-onset sepsis and a C-reactive protein of 〉10 mg/L. Sepsis was considered proven in cases of symptomatic septicaemia, meningitis, pneumonia or enterocolitis. Heart rate variability parameters (n = 16) were assessed from five-, 15- and 30-minute stationary sequences automatically selected from electrocardiographic recordings performed at admission and compared with a control group using the U-test with post hoc Benjamini-Yekutieli correction. Stationary sequences corresponded to the periods with the lowest changes of heart rate variability over time. Results A total of 40 full-term infants were enrolled, including 14 with proven sepsis. The mean duration of the cardiac cycle length was lower in the proven sepsis group than in the control group (n = 11), without other significant changes in heart rate variability parameters. These durations, measured in five-minute stationary periods, were 406 (367-433) ms in proven sepsis group versus 507 (463-522) ms in the control group (p 〈 0.05). Conclusion Early-onset neonatal sepsis was associated with a high mean heart rate measured during automatically selected stationary periods.
    Keywords: Heart Rate ; Heart Rate Variability ; Neonatal Sepsis ; Newborn Infant ; Signal Processing
    ISSN: 0803-5253
    E-ISSN: 1651-2227
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  • 4
    Language: English
    In: Journal of Colloid And Interface Science, May 15, 2013, Vol.398, p.210(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcis.2013.02.018 Byline: Nguyen Kim Nga (a), Phi Thi Thuy Hong (a), Tran Dai Lam (b), Tran Quang Huy (c) Keywords: Magnesium oxide nanoparticles; Reactive blue 19; Adsorption; BET; Cetyltrimethylammonium bromide (CTAB); Environmental treatment Abstract: Display Omitted Author Affiliation: (a) School of Chemical Engineering, Hanoi University of Science & Technology, 1 Dai Co Viet Road, Hanoi, Viet Nam (b) Institute of Materials Science, Vietnam Academy of Science & Technology, 18 Hoang Quoc Viet Road, Hanoi, Viet Nam (c) National Institute of Hygiene and Epidemiology (NIHE), 1 Yersin Street, Hanoi, Viet Nam Article History: Received 10 December 2012; Accepted 8 February 2013
    Keywords: Bromine Compounds -- Chemical Properties ; Adsorption -- Chemical Properties ; Magnesium Oxide -- Chemical Properties
    ISSN: 0021-9797
    Source: Cengage Learning, Inc.
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  • 5
    Language: English
    In: Journal of Polymer Science Part A: Polymer Chemistry, August 1, 2013, Vol.51(15), p.3110(14)
    Description: Byline: Nga H. Nguyen, Xuefei Leng, Hao-Jan Sun, Virgil Percec Keywords: air; hydrophilic polymers; kinetics (polym.); living polymerization; oligo (ethylene oxide) methacrylate; SET-LRP ABSTRACT The efficient Cu(0) wire-catalyzed single-electron transfer-living radical polymerization (SET-LRP) of oligo(ethylene oxide) methyl ether methacrylate (OEOMA) in DMSO and binary mixtures of DMSO with H.sub.2O is reported. Addition of 10-80% H.sub.2O to DMSO resulted in an increase in the apparent rate constant of propagation ( kp app), corresponding to an increase in the polarity and extent of disproportionation. At higher H.sub.2O content, kp app decreases, and kp app in H.sub.2O is slightly lower than that in DMSO. This unexpected behavior was attributed to the physical inaccessibility of Cu(0) wire catalyst to the hydrophobic reactive centers of OEOMA and initiator which self-assemble in H.sub.2O into micellar aggregates and vesicles. This hypothesis was confirmed by the faster polymerization in H.sub.2O than in DMSO during catalysis with Cu(0) nanoparticles generated by disproportionation of CuBr. SET-LRP of OEOMA can be performed in protic and dipolar aprotic solvents in air by the addition of hydrazine hydrate. The polymerization exhibited no induction period and identical kp app as in the degassed experiment, and led to polymers with narrow molecular weigh distribution. A[c] 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3110-3122 Author Affiliation:
    Keywords: Free Radicals ; Methyl Ether ; Ethylene Oxide ; Ethylene ; Polymerization ; Electron Transport ; Heterocyclic Compounds
    ISSN: 0887-624X
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  • 6
    Language: English
    In: Journal of Membrane Science, Dec 1, 2015, Vol.495, p.457(14)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.memsci.2015.05.039 Byline: Thi Phuong Nga Nguyen, Byung-Moon Jun, Jong Hwa Lee, Young-Nam Kwon Abstract: This study systematically investigated the structure and performance of integrally asymmetric and thin film composite (TFC) FO membranes to gain a better understanding of the FO transport mechanism, and to suggest appropriate characteristics of FO membranes. The effect of structure parameters (S) on the performance of the membranes was also examined. Under various operating conditions, TFC membranes yielded superior J.sub.w than integrally asymmetric CTA-based membranes, especially, with larger J.sub.w leading to higher solute resistance at alkaline feed and draw solutions. However, the integrally asymmetric membranes possessed smoother surfaces, resulting in lower fouling propensity than the polyamide TFC membranes. Besides the structure, chemical composition of the skin layer also affected the performance. TFC membranes from Toray Chemical Korea (TCK) showed lower oxygen atomic content on the active layer (AL), higher negatively charged AL and higher fouling propensity compared to the TFC HTI membrane. The TCK membrane with a woven substrate served as a promising membrane, with 2.25 times higher J.sub.w and 1.48 times less J.sub.s /J.sub.w than the TFC HTI membrane. This study showed that a preparation of FO membranes with both enhanced antifouling resistance and TCK membrane-like open and thin structure are required to develop FO membranes with desirable characteristics. Author Affiliation: (a) School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea (b) R&D Institute, Toray Chemical Korea Inc., Suwon 443-270, Republic of Korea Article History: Received 17 December 2014; Revised 6 April 2015; Accepted 16 May 2015
    Keywords: Thin Films – Analysis ; Polyamides – Analysis
    ISSN: 0376-7388
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Journal of Membrane Science, April 15, 2013, Vol.433, p.49(11)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.memsci.2013.01.027 Byline: Thi Phuong Nga Nguyen (a), Eun-Tae Yun (a), In-Chul Kim (b), Young-Nam Kwon (a) Keywords: Forward osmosis; Membrane; Cellulose triacetate; Cellulose acetate; Immersion precipitation Abstract: Cellulose triacetate/cellulose acetate (CTA/CA)-based membranes for forward osmosis (FO) were prepared by immersion precipitation. Casting composition and preparation conditions -- 1,4-dioxane/acetone ratio, CTA/CA ratio, substrate type, casting thickness, evaporation time and annealing temperature -- were tested for their effects on formation and subsequent performance of membranes. Membranes were characterized by various methods, and their performances were tested against commercially available membranes. The FO membrane prepared under optimized composition and conditions had a smooth surface and showed higher water flux and salt resistance than the commercial membranes. Annealing improved the membrane performance by removing residual additives and solvents. The computerized image processing of optical microscopy images was shown to be useful for assessing the membrane substrates. Author Affiliation: (a) School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea (b) Environment & Resources Research Center, Korea Research Institute Chemical Technology, Daejeon 305-606, Republic of Korea Article History: Received 25 October 2012; Revised 7 January 2013; Accepted 20 January 2013
    Keywords: Image Processing Equipment ; Rain ; Cellulose Acetate ; Cellulose
    ISSN: 0376-7388
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Journal of Banking & Finance, June, 2014, Vol.43, p.179(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jbankfin.2014.03.023 Byline: Benjamin M. Blau, Nga Nguyen, Ryan J. Whitby Abstract: A broad stream of research shows that information flows into underlying stock prices through the options market. For instance, prior research shows that both the Put-Call Ratio (P/C) and the Option-to-Stock Volume Ratio (O/S) predict negative future stock returns. In this paper, we compare the level of information contained in these two commonly used option volume ratios. First, we find that P/C ratios contain more predictability about future stock returns at the daily level than O/S ratios. Second, in contrast to our first set of results, O/S ratios contain more predictability about future returns at the weekly and monthly levels than P/C ratios. In fact, our tests show that while P/C ratios contain predictability about future daily returns and, to some extent, future weekly returns, the return predictability in P/C ratios is fleeting. O/S ratios, on the other hand, significantly predict negative returns at all levels: daily, weekly, and monthly. While Pan and Poteshman (2006) show that signed P/C ratios, which require proprietary data, have predictive power, we find that unsigned P/C ratios, which do not require proprietary data, also have predictive power. Article History: Received 14 May 2013; Accepted 15 March 2014
    ISSN: 0378-4266
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: Physical Review B, 9/2011, Vol.84(11)
    Description: We theoretically consider the effects of having unintentional charged impurities in laterally coupled two-dimensional double (GaAs) quantum dot systems, where each dot contains one or two electrons and a single charged impurity in the presence of an external magnetic field. Using molecular orbital and configuration interaction method, we calculate the effect of the impurity on the 2-electron energy spectrum of each individual dot as well as on the spectrum of the coupled-double-dot 2-electron system. We find that the singlet-triplet exchange splitting between the two lowest energy states, both for the individual dots and the coupled dot system, depends sensitively on the location of the impurity and its coupling strength (i.e. the effective charge). A strong electron-impurity coupling breaks down equality of the two doubly-occupied singlets in the left and the right dot leading to a mixing between different spin singlets. As a result, the maximally entangled qubit states are no longer fully obtained in zero magnetic field case. Moreover, a repulsive impurity results in a triplet-singlet transition as the impurity effective charge increases or/and the impurity position changes. We comment on the impurity effect in spin qubit operations in the double dot system based on our numerical results.
    Keywords: Physics;
    ISSN: 1098-0121
    E-ISSN: 1550-235X
    Source: American Physical Society (APS) (via CrossRef)
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  • 10
    Language: English
    In: Physical Review B, 2/2011, Vol.83(7)
    ISSN: 1098-0121
    E-ISSN: 1550-235X
    Source: American Physical Society (APS) (via CrossRef)
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