Home About us Contact
|
Home About us Contact | ||
|
|
||
Minimal Influence (minimal + influence)
Selected AbstractsAcquisition of Spanish Gender Agreement in Two Learning Contexts: Study Abroad and At HomeFOREIGN LANGUAGE ANNALS, Issue 2 2010Christina Isabelli-García Abstract: The goal of this study is to describe the acquisition rate for gender acquisition in Spanish and to show whether individual variability and language contact may affect this rate. The participants were intermediate second language Spanish (first language English) learners in the study abroad and at-home contexts over a 4-month period. The participants received grammaticality judgment tests coded for morphological class of the modified noun as well as attributive and predicative adjectives. Data were also collected on social behavior and language contact in Spanish and English in order to explain data outcome. The findings suggest that no difference exists between the two learning contexts and that social behavior and language contact abroad have minimal influence on acquisition rate. [source] Conservation and management implications of fine-scale genetic structure of Gulf sturgeon in the Pascagoula River, MississippiJOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2004M. A. Dugo Summary The anadromous Gulf sturgeon occurs along the north central coast of the Gulf of Mexico and is federally listed as threatened. We analyzed fine-scale patterns of Gulf sturgeon population structure, focusing on the Pascagoula River drainage of Mississippi, in reference to movement patterns as determined via telemetry and capture data. We genotyped 361 Gulf sturgeon using eight microsatellite loci including samples from the Pascagoula, Pearl, Escambia, Yellow, Choctawhatchee, and Apalachicola river drainages. Pairwise FST estimates indicated that genetic structure occurs at least at the drainage level. The Pascagoula and Pearl rivers form a western group, demonstrating 100% bootstrap support for a division with drainages to the east. Assignment tests detected non-natal genotypes occurring in all drainages. According to assignment tests, the Pascagoula supports an admixture of individuals, containing minimal influence from drainages to the east (2%) and substantial interaction with the Pearl River (14.1%). The occurrence of Pascagoula River fish in the Pearl was non-reciprocal, observed at 1.1%. After accounting for non-natal genetic diversity within the Pascagoula, there remained a disparity between a pooled Pascagoula group and the only documented spawning site within the drainage located in the Bouie River. We interpret this as an indication of a second genetic stock within the Pascagoula River drainage. Radio telemetry data suggest that spawning likely occurs in the Chickasawhay River, in areas isolated from the Bouie River spawning site by about 350 river kilometers. We emphasize the utility of integrating field and molecular approaches when delineating fine-scale patterns of population structure in anadromous fishes. [source] Multi-institutional study of barriers to research utilisation and evidence-based practice among hospital nursesJOURNAL OF CLINICAL NURSING, Issue 13-14 2010Caroline E Brown Aims., The study aims were to explore the relationships between perceived barriers to research use and the implementation of evidence-based practice among hospital nurses and to investigate the barriers as predictors of implementation of evidence-based practice. Background., Evidence-based practice is critical in improving healthcare quality. Although barriers to research use have been extensively studied, little is known about the relationships between the barriers and the implementation of evidence-based practice in nursing. Design., Cross-sectional study. Method., Data were collected between December 2006,January 2007 for this cross-sectional study using computerised Evidence-Based Practice Questionnaire and BARRIERS surveys. A convenience sample (n = 1301) of nurses from four hospitals in southern California, USA, participated. Hierarchical multiple regression analyses were performed for each of the three dependent variables: practice, attitude and knowledge/skills associated with evidence-based practice. BARRIERS subscales were used as predictor variables. Results., The perceived barriers to research use predicted only 2·7, 2·4 and 4·5% of practice, attitude and knowledge/skills associated with evidence-based practice. Conclusions., It was unexpected that the barriers to research use predicted such small fractions of practice, attitude and knowledge/skills associated with evidence-based practice. The barriers appear to have minimal influence over the implementation of evidence-based practice for most hospital nurses. Relevance to clinical practice., In implementing evidence-based practice, the focus on barriers to research use among general nursing staff may be misplaced. Further studies are needed to identify the predictors of evidence-based practice and to identify the subset of nurses who are most amenable to adopting evidence-based practice. [source] Injury risk in young people with intellectual disabilityJOURNAL OF INTELLECTUAL DISABILITY RESEARCH, Issue 1 2002J Sherrard Abstract Epidemiological studies have established injury as a major public health problem for young people in the general population, but minimal population-based injury information exists on those with intellectual disability (ID). The present study investigated risk factors for injury to subjects in the Australian Child and Adolescent Development (ACAD) programme, which is examining emotional and behavioural problems in young people with ID. Extensive biopsychosocial data for the ACAD programme were collected at two time intervals (i.e. 1990,1991 and 1995,1996). Carer report of medically attended injury over one year was collected for the first time period (1995,1996) on a sample of 465 ACAD subjects (aged 5,29 years) representative of young people with ID (IQ < 70) to determine risk factors for injury using the ACAD biopsychosocial data. Psychopathology [odds ratio (OR) = 3.4] epilepsy (OR = 2.4) and an overly sociable temperament (OR = 2.2) are associated with injury in young people with ID. Social and family factors had minimal influence on injury risk in this population. Those who are highly disruptive, self-absorbed, anxious, have problems relating socially, have communication disturbance or have attention deficit hyperactivity symptoms are particularly at increased risk for injury. The present study demonstrates a largely under-recognized public health problem of a high unintentional injury risk for young people with ID, and identifies substantial and important risk factors for injury. Injury prevention programmes, with a particular focus on those with highly disturbed behaviours or epilepsy, are warranted in this population. [source] Influence of the alkene structure on the mechanism and kinetics of thiol,alkene photopolymerizations with real-time infrared spectroscopyJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 24 2004Todd M. Roper Abstract The effect of the chemical structure on the reactivity of alkenes used in thiol,ene photopolymerizations has been investigated with real-time infrared spectroscopy. Model studies of thiol,ene photoreactions with various monofunctional hydrocarbon alkenes and the monofunctional thiol ethyl-3-mercaptopropionate have been performed to identify and understand structure,reactivity relationships. The results demonstrate that terminal enes react very rapidly with thiol, achieve complete conversion, and are independent of the aliphatic hydrocarbon substituent length. Disubstitution on a single carbon of a terminal ene significantly reduces the reactivity, whereas substitution on the carbon , to the terminal ene has a minimal influence on the reactivity. Internal trans enes display reduced reactivity and a lower overall conversion and deviate from the standard thiol,ene reaction mechanism because of steric strain induced by 1,3-interactions. The reactivity and conversion of internal trans enes decrease as the substituents on the ene become larger, reaching a minimum when the substituent size is greater than or equal to that of propyl groups. Internal cis enes react rapidly with thiol; however, they undergo a fast isomerization,elimination reaction sequence generating the trans ene, which proceeds to react at a reduced rate with thiol. The reactivity of cyclic enes is dictated by ring strain, stereoelectronic effects, and hydrogen abstractability. The reactivity trends in the model studies have been used to explain the photopolymerization mechanism and kinetics of a series of multifunctional thiol,ene systems. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 6283,6298, 2004 [source] Photosensitivity in patients with lupus erythematosus: a clinical and photobiological study of 100 patients using a prolonged phototest protocolBRITISH JOURNAL OF DERMATOLOGY, Issue 1 2003C.J.G. Sanders SummaryBackground There is a clear relationship between ultraviolet (UV) radiation (UVR) and the clinical manifestations of patients with lupus erythematosus (LE). Cutaneous lesions are induced or exacerbated by exposure to UVR. Of patients with LE, 24,83% are reported to be photosensitive to UVR. LE tumidus appears to be the most photosensitive subtype of LE, followed by subacute cutaneous LE (SCLE). In general, the history of patients with LE correlates poorly with the presence or absence of photosensitivity, due to a delayed time interval between UV exposure and exacerbation of skin lesions. Phototesting using artificial UVR and visible light is a reliable way of diagnosing photosensitivity. Objectives To investigate the photoreactivity of patients with various subtypes of LE using an individualized phototest protocol. The results of phototests were correlated with the history of photosensitivity, the subtype of LE, the presence of autoantibodies and the use of anti-inflammatory medication by these patients. Methods Phototesting with UVA, UVB and visible light was performed in 100 patients with LE. The diagnosis of LE was established both on clinical examination and skin histology. Serological studies were also performed in all patients. The phototests were performed on large skin areas of the forearm or trunk; the first dose was twice the minimal erythema dose and the dosage was increased according to the individual reactions of the patients at the test sites. Follow-up of skin reactions at the test sites was performed for up to 2 months. Histological examination of the photoprovoked skin lesions was carried out in 57 patients. Results Of the 100 patients included (81 women and 19 men; mean age 41 years, range 17,79), 46 had chronic discoid LE, 30 SCLE and 24 systemic LE. An abnormal reaction to UVR and visible light was found in 93% of our patients with LE. No clinical or histological evidence at the phototest sites of polymorphic light eruption was found. There was no correlation between photosensitivity and LE subtype, presence of autoantibodies or medical history. Concomitant use of anti-inflammatory medication seemed to exert only minimal influence on the results of phototesting. Conclusions When using an extended phototesting protocol, almost all patients with LE in this study showed clinical and histological evidence of aberrant photosensitivity. Therefore, patients with LE should receive thorough advice and instruction on photoprotective measures, regardless of their history, LE subtype or presence of autoantibodies. [source] Systemic tetracycline delays degradation of three different collagen membranes in rat calvariaCLINICAL ORAL IMPLANTS RESEARCH, Issue 2 2009Ofer Moses Abstract Objectives: The aim of this study was to quantitatively evaluate the effect of systemic tetracycline (TTC) on the degradation of three different collagen membranes. Materials and methods: Collagen membranes were cut into 5 mm diameter membrane discs and labeled with aminohexanoyl-biotin- N -hydroxy-succinimide ester. One membrane disc each of a non-cross-linked [BioGide® (BG)], glutaraldehyde cross-linked [BioMend Extend® (BM)], and ribose cross-linked [OssixÔ (OS)] was implanted on the calvaria of 40 Wistar rats. Another 10 biotinylated collagen membrane discs from each membrane type were processed for histologic observation and served as baseline; half of them (five from each group) were also treated with formic acid to inspect possible interference with biotinilazation of collagen by formic acid used during the decalcification process. A 10 mg/kg dose of TTC (50% of the minimal recommended antibacterial dose) to the experimental (20 animals) and saline to the control (20 animals) group was administered intramuscularly every 3 days. From each group, block sections were retrieved in half of the animals after 14 days and in the remaining after 28 days. Decalcified tissue histology was stained with streptavidin horseradish peroxidase. A computer-assisted program measured the membranes' collagen contents. Statistical analysis consisted of analysis of variance (ANOVA) with repeated measures. Results: No statistically significant differences in collagen contents were appreciated between biotinylated non-implanted membranes treated or not treated by formic acid. Systemic TTC had a different effect on the bio-degradation of the membranes: while it significantly decreased the resorption of two of the membranes (BG and BM), it had minimal influence on the ribose cross-linked membrane (OS). ANOVA with repeated measures, tests of within-subjects effects, showed a statistically significant difference between the membranes (P<0.001), within the membranes at the different time-points (P<0.001), a significant interaction between membranes and time and between the membranes and administered TTC (P<0.001). Test of between-subject effects revealed a statistically significant interaction with time and with TTC (P<0.001). Conclusions: Systemically administered TTC in sub-antibacterial doses may offer a possible treatment alternative to reduce bio-degradation and enhance bio-durability of certain collagen membranes. The findings of the present study could have clinical application in large non-self-contained bone defects, where prolonged membrane barrier functions are desirable. [source] | ||||||||||