Science Letters： Simultaneous determination of fluoride, chloride, sulfate, phosphate, monofluorophosphate, glycerophosphate, sorbate, and saccharin in gargles by ion chromatography

Simple, reliable and sensitive analytical methods to determine anticariogenic agents, preservatives, and artificial sweeteners contained in commercial gargles are necessary for evaluating their effectiveness, safety, and quality. An ion chromatography （IC） method has been described to analyze simultaneously eight anions including fluoride, chloride, sulfate, phosphate, monofluorophosphate, glycerophosphate （anticariogenic agents）, sorbate （a preservative）, and saccharin （an artificial sweetener） in gargles. In this IC system, we applied a mobile phased gradient elution with KOH, separation by IonPac AS18 columns, and suppressed conductivity detection. Optimized analytical conditions were further evaluated for accuracy. The relative standard deviations （RSDs） of the inter-day＇s retention time and peak area of all species were less than 0.938% and 8.731%, respectively, while RSDs of 5-day retention time and peak area were less than 1.265% and 8.934%, respectively. The correlation coefficients for targeted analytes ranged from 0.999 7 to 1.000 0. The spiked recoveries for the anions were 90%-102.5%. We concluded that the method can be applied for comprehensive evaluation of commercial gargles.     

^—T（1,1,t＋1,t,1）和^—T（1,1,t＋2,t,1）的色唯一性

h（G,x）表示图G的伴随多项式,β（G）表示h（G,x）的最小负实根．证明了当t≥3时,r（1,1,t＋1,t,1）和T（1,1,t＋2,t,1）的补图的色唯一性。     

Serial learning,interitem associations,phrasing cues,interference, overshadowing,chunking, memory,and extinction

Two experiments indicated that two approaches to serial learning are too extreme—the classical view that it consists only of interitem associations and various recent views that it involves no interitem associations. The novel assumption introduced here was that phrasing cues, normally conceptualized as merely segregating long series into smaller units or chunks, may also enter into associations with items, thereby reducing interitem interference and facilitating serial learning. It was found that one item could become a signal for another item, an interitem association, or be overshadowed by a phrasing cue, such as a brightness and temporal cue, also signaling that item. The items were .045-g pellets. Rats traversed a runway for items arranged in ordered series, 14-7-3-1-0 pellets (Experiment 1) or 10-2-0-10 (Experiment 2). Complete tracking of, for example, the 10-2-0-10 series would consist of fastest running to 10 pellets and slowest running to 0 pellets. In both investigations, the interitem association overshadowed was that between 0 pellets and the subsequent rewarded item, 0 → 14 (Experiment 1) or 0 → 10 (Experiment 2). Either repetitions of the 14-7-3-1-0 subpattern (Experiment 1) or merely the terminal 10-pellet item (Experiment 2) were phrased, both methods producing identical results. Overshadowing the 0-pellet item produced superior serial learning, more rapid extinction, and, in Experiment 1, considerable elevation of responding when the brightness phrasing cue was introduced in extinction, an effect said to be conceptually identical to spontaneous recovery and one demonstrating directly that phrasing cues are in reality overshadowing cues. It was suggested that many effects attributed to forgetting may be due to unrecognized overshadowing of memory cues by phrasing cues, giving rise to exaggerated estimates of forgetting.     

The Highly Lawful Relationships Among Pseudoword Decoding,Word Identification,Spelling, Listening,and Reading

It has been theorized that there are highly lawful relationships among levels of pseudoword decoding, word identification, spelling, listening, and reading that can be represented by relatively simple mathematical formulas. This theory was tested by reanalyzing data collected from 55 parochial school students in Grades 3 to 6 (Study I) and 83 public school students in Grades 4 and 5 (Study II). These students were given a battery of reading-related tests that included measures relevant to the theory noted previously. The results from Study II replicated those from Study I, indicating that (a) level of word identification and level of spelling are equal, (b) level of pseudoword decoding (or word attack) and level of ability to pronounce unknown real words are equal, (c) level of word identification equals the average of the level of reading and the level of pseudoword decoding, and (d) level of reading equals the average of the level of listening and the level of word identification. These data, along with previously collected data, suggest that measures of the aforementioned reading-related variables are so closely connected that (a) highly reliable measures of spelling level and word attack level for a student could be used to estimate or predict that student's levels of reading, listening, and word identification, and (b) highly reliable measures of reading level and word identification level for a student could be used to estimate or predict that student's levels of listening, spelling, and word attack.     

Simultaneous determination of fluoride, chloride, sulfate, phosphate,monofluorophosphate, glycerophosphate, sorbate, and saccharin in gargles by ion chromatography

Simple, reliable and sensitive analytical methods to determine anticariogenic agents, preservatives, and artificial sweeteners contained in commercial gargles are necessary for evaluating their effectiveness, safety, and quality. An ion chromatography (IC) method has been described to analyze simultaneously eight anions including fluoride, chloride, sulfate, phosphate,monofluorophosphate, glycerophosphate (anticariogenic agents), sorbate (a preservative), and saccharin (an artificial sweetener)in gargles. In this IC system, we applied a mobile phased gradient elution with KOH, separation by IonPac AS18 columns, and suppressed conductivity detection. Optimized analytical conditions were further evaluated for accuracy. The relative standard deviations (RSDs) of the inter-day's retention time and peak area of all species were less than 0.938% and 8.731%, respectively,while RSDs of 5-day retention time and peak area were less than 1.265% and 8.934%, respectively. The correlation coefficients for targeted analytes ranged from 0.999 7 to 1.000 0. The spiked recoveries for the anions were 90%～102.5%. We concluded that the method can be applied for comprehensive evaluation of commercial gargles.     

Understanding Parenting Stress Among Young, Low-income, African-American, First-Time Mothers

The purpose of this study was to test a theoretical model that examined the extent to which cognitive readiness to parent, perceived difficult child temperament, observed parenting behaviors, and positive coping styles predicted parenting stress among young, low-income, first-time, African-American mothers. One hundred and twenty African-American, first-time mothers who applied to the Early Head Start program were selected to participate in this study. Results based on structural equation modeling indicated that: (1) observed positive parenting behaviors were negatively related to parenting stress; (2) difficult child temperament was positively related to parenting stress; (3) positive coping styles did not buffer the relationship between difficult child temperament and parenting stress; (4) difficult child temperament was not directly associated with observed parenting behaviors; (5) cognitive readiness to parent was only indirectly related to parenting stress; and (6) observed parenting behaviors mediated the link between cognitive readiness to parent and parenting stress. Future research directions and implications of these findings for professionals working with young mothers are discussed.     

ISEI,ISCED, HOMEPOS,ESCS

Ziel dieses Beitrages ist es, verschiedene Indikatoren der sozialen Herkunft bei der Quantifizierung von sozialen Disparit?ten zu vergleichen. Im Mittelpunkt steht dabei der in PISA eingesetzte Index für den Economic, Social and Cultural Status (ESCS). Dieser umfasst sozio?konomische und kulturelle Ressourcen des Elternhauses und deckt damit das theoretische Konstrukt umfassender ab als andere Indikatoren der sozialen Herkunft. Anhand der internationalen Schülerdaten aus PISA 2003 und aus der nationalen Erg?nzungsstudie (PISA-E) wurden Regressionsanalysen mit verschiedenen Herkunftsindikatoren gerechnet. Neben dem ESCS wurden als Pr?diktoren der sozio?konomische Status (HISEI), der h?chste Bildungsabschluss umgerechnet in Bildungsjahre (PARED) und ein Index für h?usliche Besitztümer (HOMEPOS) berücksichtigt. Es zeigt sich, dass der ESCS in allen Bildungssystemen deutlich mehr Varianz in der mathematischen Kompetenz aufkl?rt als die Einzelpr?diktoren HISEI, PARED oder HOMEPOS. Auch in einer anschlie?enden Analyse zu sozialen Disparit?ten der Bildungsbeteiligung lieferte der ESCS differenziertere Befunde als der HISEI. Insgesamt wird der ESCS als valider und theoretisch umfassender Index der sozialen Herkunft eingesch?tzt.     

Olympism,Sport, and Education

The aims and values of Olympism are briefly examined. Sport is then described as an inherently worthwhile practice, concemed with its own goals, standards, and traditions. The place of sport in relation to education and the curriculum is discussed, and the role of the teacher of sport as “educator” is clarified by reference to four points: (a) the teacher as an initiator into and as a guardian of the practice view of sport; (b) the teacher as an enlightened leader of discussion; (c) the teacher as a provider of individual pastoral care; and (d) the teacher as exemplar of the values to which a commitment has been made. The final section is concemed with the relationship between Olympism and sport as a form of education.     

譬侔援推及其规则

《墨经》中所论譬、侔、援、推是以"类同"为根据的类比推理,运用中遵守"异类不比"的基本规则.系统阐释四种推理的内涵、特征,可见我国先秦类比逻辑的基本架构.     

Further Distinctions between Magic, Reality, Religion, and Fiction

Children's representations of counterintuitive phenomena can be better understood if we take into account the following: (1) Children may develop a conceptual slot for "counterintuitive+real" phenomena, (2) Notions of "reality" in early children's handling of fiction. (4) Cultural systems of religious representations make particular demands on developmental processes.     

Cloning, expression, purification, and characterization of LC-1 ScFv with GFP tag

INTRODUCTION Because of its low molecular weight and ability to fluoresce independently (George, 1997), the new molecular tag, green fluorescent protein (GFP), has become more and more popular after Prasher et al.(1992) cloned its cDNA in 1992. There are many reports describing the co-expression of GFP and a specific antibody or cytokine gene, with the fusion protein expressing the fluorescent activity and bio-logical activity of the complement protein (Haraguchi et al., 1999; Mclean…     

Ethnicity,Effort, Self-Efficacy,Worry, and Statistics Achievement in Malaysia: A Construct Validation of the State-Trait Motivation Model

The relations between motivational constructs, effort, self-efficacy and worry, and statistics achievement were investigated in a sample of 360 undergraduates in Malaysia. Both trait (cross-situational) and state (task-specific) measures of each construct were used to test a mediational trait (r) state (r) performance (TSP) model. As hypothesized, all three traits were found to be empirically distinguishable from their state counterparts in a confirmatory factor analysis. In a structural equation model, each trait also had a direct effect on its corresponding state as hypothesized. Most importantly, state worry and state effort had significant direct effects on statistics achievement in the predicted direction. Gender and ethnic (Malay vs. Chinese) differences and other predictions related to social cognitive theories of motivation also were analyzed and are discussed. Overall, results provide strong evidence for the utility of the state-trait distinction as applied to motivational constructs and are consistent with findings from U.S. samples.     

Buckyballs,hairyballs, educational semiotics,and other interesting topics

This paper develops the thesis that the educational semiotic described by Cunningham offers an interesting perspective from which to view educational issues, but it offers little in the way of practical approaches to educational problems. After agreeing with Cunningham's argument that knowledge is constructed rather than received, the paper goes on to state three concerns about an educational semiotic: (a) The theory has the wrong architecture, (b) the theory is too powerful, and (c) the theory has no practical use. The paper closes with the observation that an educational semiotic must become more specific and it must provide empirical demonstrations of practical utility if it is to pose a challenge to currently prevailing theories.     

Navigating Community College Transfer in Science,Technical, Engineering,and Mathematics Fields

Given financial barriers facing community college students today, and workforce projections in science, technical, engineering, and math (STEM) fields, the costs of unnecessary delays while navigating transfer pathways are high. In this phenomenological study, we analyzed the delay experiences of 172 students (65% female) navigating community college transfer pathways in STEM fields in Massachusetts. When focusing on institutional delays, three central elements emerged: (a) informational setbacks from dissatisfactory advising, (b) imperfect program alignment with four-year institutions, and (c) college resource limitations. Students took unnecessary courses or could not get into courses in a timely manner, resulting in lost time, money, and credit. An accumulation of delays is particularly detrimental to STEM women and men, given the sequential nature of their programming. Implications for policy and practice are discussed.     

Cars, Culture, and Tactical Technical Communication

This article examines two cases of technical documentation occurring outside of institutions. Using a framework derived from de Certeau's (1984) distinction between strategies and tactics and Johnson's (1998) concept of the user-as-producer, I analyze communities surrounding Muir's (1969) How to Keep Your Volkswagen Alive! A Manual of Step by Step Procedures for the Compleat Idiot and Champion's (2000) Build Your Own Sports Car for as Little as £250. These communities engage in tactical technical communication, especially in the form of technological narratives that participate in broader cultural narratives about technology.     

College Student Cyberbullying: Self‐Esteem,Depression, Loneliness,and Attachment

In an online survey (N = 338) at a large midwestern university, frequency counts indicated that 51 (15.1%) undergraduate students were cyberbully victims during college, and 27 (8.0%) were cyberbully offenders during college. In simultaneous regressions, maternal attachment anxiety explained unique variance in cybervictimization and cyberoffending. In multivariate analyses of variance, cyberbully victims (vs. nonvictims) reported higher depression, loneliness, and maternal attachment anxiety, and cyberbully offenders (vs. nonoffenders) reported lower self‐esteem and higher maternal attachment anxiety. College counseling implications are discussed.     

Father absence, perceived, maternal behavior, and moral development in boys.

The rated and observed moral behavior, judgment, and affect of 120 preadolescent, predominantly lower-class boys from early-divorced (before the boys were 6), late-divorced (between 6 and 10), and parentally intact homes were investigated. In addition, the mothers' discipline (power assertive, inductive, and love withdrawal) and affection were examined by asking subjects about their mothers' methods of dealing with their transgressions. Moral behavior was assessed with resistance-to-temptation, self-criticism, altruism, reparation, and teacher-rating measures, while moral judgment was evaluated with 3 Kohlberg items and moral affect was investigated with 2 story-completion items maximizing guilt. The major findings were: (1) when relevant variables (IQ, SES, age, sibling status) were controlled, few differences were found between father-absent and father-present boys; (2) however, father-absent boys were reported by their teachers as less advanced in moral development than father-present boys; (3) the sons of the divorced women showed more "social deviation", according to their teachers, but were more advanced in level of moral judgment than were the sons of widows; (4) divorced women disciplined with more power assertion than widows, according to their sons' reports.     

Class, Identity, and Teacher Education

This paper explores the possibilities of working with White, working-class teacher education students to explore the “complex social trajectory” (Reay in Women’s Stud Int Forum 20(2):225–233, 1997a, p. 19) of class border crossing as they progress through college. Through analysis of a course that I have developed, Education and the American Dream, I explore political and pedagogical issues in teaching the thousands of teacher education students who are the first in their families to attend college about social class. Arguing that faculty in teacher education too often disregard the significance of deep class differences between themselves and many of their students, I propose that teacher education include coursework in which upwardly-mobile students (a) draw upon their distinctive perspectives as class border-crossers to elucidate their “complex social positioning as a complicated amalgam of current privilege interlaced with historic disadvantage” (Reay in Women’s Stud Int Forum 20(2):225–233, 1997a, p. 25) and (b) complicate what Adair and Dahlberg (Pedagogy 1:173–175, 2001, p. 174) have termed a cultural “impulse to frame class mobility as a narrative of moral progress”. Such coursework, I suggest, has implications for the development of teacher leaders in stratified schools. The paper draws upon the literatures on social class and educational attainment, on the construction of classed identities in spite of silence about class in public and academic discourse, and on pedagogies for teaching across class differences.     

Business,Ethics, and the Physical Activity Field

Already in childhood, (a) high general and visceral fatness and poor cardiovascular (CV) fitness are linked with dyslipidemia, elevated blood pressure, and insulin resistance; (b) higher fatness is associated with low amounts of vigorous physical activity (PA) and relatively low energy intake; (c) higher CV fitness is more clearly associated with vigorous PA than with moderate PA; (d) higher levels of PA are associated with higher bone density only in youths with relatively high calcium intakes. Physical training in youths has favorable effects on total body and visceral adiposity, bone density, CV fitness, and some risk factors for CV disease and type 2 diabetes. Thus, vigorous PA during childhood may help to prevent some major “adult” health problems.