Randomized trial of individual reminiscence therapy for older adults with cognitive impairment: a 3-month responder analysis. / Ensayo aleatorio de terapia de reminiscencia individual para adultos mayores con deterioro cognitivo: un análisis de respuesta de tres meses.

INTRODUCTION: Non-pharmacological intervention options, including individual reminiscence therapy (iRT), have been effective in improving cognitive functioning, mood, and quality of life (QoL) in persons with neurocognitive disorders (NCD). OBJECTIVES: A 13-week randomized trial intervention utilizing iRT was conducted on older adults with NCD. We explored predictors of participants with positive and non-positive intervention responses using responder analysis, an analytic strategy that focuses on contributors to intervention response. PATIENTS AND METHODS: Re-analysis of a published single-blind, multicentre, randomised controlled trial on 251 older adult residents with NCD from residential facilities across Portugal. Participants received 13 weeks of biweekly iRT (26 sessions) or treatment/programming as usual. Outcomes included global cognition (Minimental State Examination), memory (MAT), executive functioning (FAB), depressive symptoms (GDS-15), and QoL (QoL-AD). RESULTS: There were more responders in the intervention than the control group on all five criteria, with significant differences for cognition (p = 0.001; f = 0.202; NNT = 5) and memory (p = 0.004; f = 0.184; NNT = 6). At baseline, intervention responders vs non-responders had: higher QoL-AD scores (30.23 vs 25.57; p < 0.001; d = -0.774) for cognition; lower FAB scores (1.41 vs -2.12; p < 0.001; d = 0.928) for executive functioning; higher GDS-15 scores for the depressive symptoms (7.57 vs 4.91; p < 0.001; d = -0.845), and for QoL (6.81 vs 5.33; p = 0.013; d = -0.443). CONCLUSIONS: The iRT intervention showed high response rates for cognition and memory. Those with worse executive dysfunction, mood, and QoL, benefitted most from the intervention for those respective outcomes. Therefore, the presented iRT has beneficial effects for people with NCD, with mood and QoL as important influential factors.

TITLE: Ensayo aleatorio de terapia de reminiscencia individual para adultos mayores con deterioro cognitivo: un análisis de respuesta de tres meses.Introducción. La terapia de reminiscencia individual (iTR) ha demostrado mejorar la cognición, el estado de ánimo y la calidad de vida (CdV) de personas con trastornos neurocognitivos (TNC). Objetivo. Se exploraron los predictores de la respuesta positiva a la iTR utilizando el análisis de respuesta, una estrategia analítica de los factores que contribuyen a una respuesta a la intervención. Pacientes y métodos. Reanálisis de un ensayo controlado aleatorizado de 251 adultos mayores portugueses con TNC. Los participantes recibieron dos sesiones de iTR durante 13 semanas (26 sesiones) o el tratamiento habitual. Las variables analizadas fueron la cognición global (Minimental State Examination), la memoria (test de alteración de la memoria), el funcionamiento ejecutivo ­batería de evaluación frontal (FAB)­, los síntomas depresivos ­escala de depresión geriátrica-15 (GDS-15)­ y la CdV ­escala de calidad de vida en la enfermedad de Alzheimer (QOL-AD)­. Resultados. Hubo más respondedores en el grupo de intervención que en el de control en los cinco criterios, con diferencias significativas para cognición (p = 0,001; f = 0,202; número necesario para tratar = 5) y memoria (p = 0,004; f = 0,184; número necesario para tratar = 6). En la línea de base, los respondedores tenían: puntuaciones más altas de QOL-AD (30,23 frente a 25,57; p menor de 0,001; d = ­0,774) para la cognición; puntuaciones FAB más bajas (1,41 frente a ­2,12; p menor de 0,001; d = 0,928) para el funcionamiento ejecutivo; y mayores puntuaciones en la GDS-15 para los síntomas depresivos (7,57 frente a 4,91; p menor de 0,001; d = ­0,845) y para la CdV (6,81 frente a 5,33; p = 0,013; d = ­0,443). Conclusiones. La iTR mostró altas tasas de respuesta para la cognición y la memoria. Los que tienen peor función ejecutiva, estado de ánimo y CdV se beneficiaron más de la intervención para esas respectivas variables. La iTR tiene efectos beneficiosos en los TNC, con el estado de ánimo y la CdV como factores influyentes.

Ensayo aleatorio de terapia de reminiscencia individual para adultos mayores con deterioro cognitivo: un análisis de respuesta de tres meses / Randomized trial of individual reminiscence therapy for older adults with cognitive impairment: a 3-month responder analysis

Introducción: La terapia de reminiscencia individual (iTR) ha demostrado mejorar la cognición, el estado de ánimo y la calidad de vida (CdV) de personas con trastornos neurocognitivos (TNC). Objetivo: Se exploraron los predictores de la respuesta positiva a la iTR utilizando el análisis de respuesta, una estrategia analítica de los factores que contribuyen a una respuesta a la intervención. Pacientes y métodos: Reanálisis de un ensayo controlado aleatorizado de 251 adultos mayores portugueses con TNC. Los participantes recibieron dos sesiones de iTR durante 13 semanas (26 sesiones) o el tratamiento habitual. Las variables analizadas fueron la cognición global (Minimental State Examination), la memoria (test de alteración de la memoria), el funcionamiento ejecutivo –batería de evaluación frontal (FAB)–, los síntomas depresivos –escala de depresión geriátrica-15 (GDS-15)– y la CdV –escala de calidad de vida en la enfermedad de Alzheimer (QOL-AD)–. Resultados: Hubo más respondedores en el grupo de intervención que en el de control en los cinco criterios, con diferencias significativas para cognición (p = 0,001; f = 0,202; número necesario para tratar = 5) y memoria (p = 0,004; f = 0,184; número necesario para tratar = 6). En la línea de base, los respondedores tenían: puntuaciones más altas de QOL-AD (30,23 frente a 25,57; p < 0,001; d = –0,774) para la cognición; puntuaciones FAB más bajas (1,41 frente a –2,12; p < 0,001; d = 0,928) para el funcionamiento ejecutivo; y mayores puntuaciones en la GDS-15 para los síntomas depresivos (7,57 frente a 4,91; p < 0,001; d = –0,845) y para la CdV (6,81 frente a 5,33; p = 0,013; d = –0,443). Conclusiones: La iTR mostró altas tasas de respuesta para la cognición y la memoria. Los que tienen peor función ejecutiva, estado de ánimo y CdV se beneficiaron más de la intervención para esas respectivas variables. La iTR tiene efectos beneficiosos en los TNC, con el estado de ánimo y la CdV como factores influyentes.(AU)

Introduction: Non-pharmacological intervention options, including individual reminiscence therapy (iRT), have been effective in improving cognitive functioning, mood, and quality of life (QoL) in persons with neurocognitive disorders (NCD). Objectives: A 13-week randomized trial intervention utilizing iRT was conducted on older adults with NCD. We explored predictors of participants with positive and non-positive intervention responses using responder analysis, an analytic strategy that focuses on contributors to intervention response. Patients and methods: Re-analysis of a published single-blind, multicentre, randomised controlled trial on 251 older adult residents with NCD from residential facilities across Portugal. Participants received 13 weeks of biweekly iRT (26 sessions) or treatment/programming as usual. Outcomes included global cognition (Minimental State Examination), memory (MAT), executive functioning (FAB), depressive symptoms (GDS-15), and QoL (QoL-AD). Results: There were more responders in the intervention than the control group on all five criteria, with significant differences for cognition (p = 0.001; f = 0.202; NNT = 5) and memory (p = 0.004; f = 0.184; NNT = 6). At baseline, intervention responders vs non-responders had: higher QoL-AD scores (30.23 vs 25.57; p < 0.001; d = –0.774) for cognition; lower FAB scores (1.41 vs –2.12; p < 0.001; d = 0.928) for executive functioning; higher GDS-15 scores for the depressive symptoms (7.57 vs 4.91; p < 0.001; d = –0.845), and for QoL (6.81 vs 5.33; p = 0.013; d = –0.443). Conclusions: The iRT intervention showed high response rates for cognition and memory. Those with worse executive dysfunction, mood, and QoL, benefitted most from the intervention for those respective outcomes. Therefore, the presented iRT has beneficial effects for people with NCD, with mood and QoL as important influential factors.(AU)

Genetic analysis of feet and leg conformation traits in Nelore cattle.

Feet and leg conformation scores are important traits in beef cattle because they encompass a wide range of locomotion disorders that can lead to productive and reproductive losses. Thus, the study of feet and legs in beef cattle is essential for evaluating possible responses to selection focusing on minimizing economic losses caused by the occurrence of feet and leg problems. The aim of this study was to estimate variance components for feet and leg conformation traits in Nelore cattle. The data set contained records of approximately 300,000 animals that were born between 2000 and 2013. These animals belonged to the commercial beef cattle breeding program of the CRV Lagoa (). Feet and legs were evaluated by assigning visual scores at 2 different time points: feet and leg evaluated as a binary trait (FL1), measured at yearling (about 550 d of age) to identify whether (or not) an animal has feet and leg defects, and feet and leg score (FL2), ranging from 1 (less desirable) to 5 (more desirable) was assigned to the top 20% of animals according to the selection index adopted by the beef cattle breeding program, which was measured 2 to 5 mo after the yearling evaluation. The FL1 and FL2 traits were analyzed together with yearling weight (YW). The (co)variance components and breeding values were estimated by Bayesian inference using 2-trait animal models. The posterior means (standard errors) of the heritabilities for FL1, FL2, and YW were 0.18 (0.04), 0.39 (0.07), and 0.47 (0.01), respectively. The results indicate that the incidence of feet and leg problems in this population might be reduced by selection. The genetic correlation between FL1 and FL2 (-0.47) was moderate and negative as expected because the classification score that holds up each trait has opposite numerical values. The genetic trends estimated for FL1 and FL2 (-0.042 and 0.021 genetic standard deviations per year, respectively) were favorable and they indicate that the independent culling strategy for feet and leg problems promotes favorable changes and contributes to the genetic progress of these traits in the population under study.

Accuracy of genomic predictions in Gyr (Bos indicus) dairy cattle.

Genomic selection may accelerate genetic progress in breeding programs of indicine breeds when compared with traditional selection methods. We present results of genomic predictions in Gyr (Bos indicus) dairy cattle of Brazil for milk yield (MY), fat yield (FY), protein yield (PY), and age at first calving using information from bulls and cows. Four different single nucleotide polymorphism (SNP) chips were studied. Additionally, the effect of the use of imputed data on genomic prediction accuracy was studied. A total of 474 bulls and 1,688 cows were genotyped with the Illumina BovineHD (HD; San Diego, CA) and BovineSNP50 (50K) chip, respectively. Genotypes of cows were imputed to HD using FImpute v2.2. After quality check of data, 496,606 markers remained. The HD markers present on the GeneSeek SGGP-20Ki (15,727; Lincoln, NE), 50K (22,152), and GeneSeek GGP-75Ki (65,018) were subset and used to assess the effect of lower SNP density on accuracy of prediction. Deregressed breeding values were used as pseudophenotypes for model training. Data were split into reference and validation to mimic a forward prediction scheme. The reference population consisted of animals whose birth year was ≤2004 and consisted of either only bulls (TR1) or a combination of bulls and dams (TR2), whereas the validation set consisted of younger bulls (born after 2004). Genomic BLUP was used to estimate genomic breeding values (GEBV) and reliability of GEBV (R2PEV) was based on the prediction error variance approach. Reliability of GEBV ranged from ∼0.46 (FY and PY) to 0.56 (MY) with TR1 and from 0.51 (PY) to 0.65 (MY) with TR2. When averaged across all traits, R2PEV were substantially higher (R2PEV of TR1 = 0.50 and TR2 = 0.57) compared with reliabilities of parent averages (0.35) computed from pedigree data and based on diagonals of the coefficient matrix (prediction error variance approach). Reliability was similar for all the 4 marker panels using either TR1 or TR2, except that imputed HD cow data set led to an inflation of reliability. Reliability of GEBV could be increased by enlarging the limited bull reference population with cow information. A reduced panel of ∼15K markers resulted in reliabilities similar to using HD markers. Reliability of GEBV could be increased by enlarging the limited bull reference population with cow information.

Genetic control of residual variance of yearling weight in Nellore beef cattle.

There is evidence for genetic variability in residual variance of livestock traits, which offers the potential for selection for increased uniformity of production. Different statistical approaches have been employed to study this topic; however, little is known about the concordance between them. The aim of our study was to investigate the genetic heterogeneity of residual variance on yearling weight (YW; 291.15 ± 46.67) in a Nellore beef cattle population; to compare the results of the statistical approaches, the two-step approach and the double hierarchical generalized linear model (DHGLM); and to evaluate the effectiveness of power transformation to accommodate scale differences. The comparison was based on genetic parameters, accuracy of EBV for residual variance, and cross-validation to assess predictive performance of both approaches. A total of 194,628 yearling weight records from 625 sires were used in the analysis. The results supported the hypothesis of genetic heterogeneity of residual variance on YW in Nellore beef cattle and the opportunity of selection, measured through the genetic coefficient of variation of residual variance (0.10 to 0.12 for the two-step approach and 0.17 for DHGLM, using an untransformed data set). However, low estimates of genetic variance associated with positive genetic correlations between mean and residual variance (about 0.20 for two-step and 0.76 for DHGLM for an untransformed data set) limit the genetic response to selection for uniformity of production while simultaneously increasing YW itself. Moreover, large sire families are needed to obtain accurate estimates of genetic merit for residual variance, as indicated by the low heritability estimates (<0.007). Box-Cox transformation was able to decrease the dependence of the variance on the mean and decreased the estimates of genetic parameters for residual variance. The transformation reduced but did not eliminate all the genetic heterogeneity of residual variance, highlighting its presence beyond the scale effect. The DHGLM showed higher predictive ability of EBV for residual variance and therefore should be preferred over the two-step approach.

Manual resuscitators in successive use in the same patient: reservoir of multi- and extensively resistant bacteria.

To determine the bacterial load on manual resuscitators (MRs), swab samples of MR connectors from a Brazilian intensive care unit were collected at time zero, and after 24 and 48h use in the same patient. From 20 MRs, a total of 54 bacteria were isolated: six at t=0, 17 at t=24, and 31 at t=48. Staphylococcus aureus, Acinetobacter baumannii, Serratia marcescens, and Pseudomonas aeruginosa were the predominant isolates, and multidrug resistance was widespread in all species. Greater awareness of the need to ensure effective decontamination of MRs between patients, as well as more frequent replacement of MRs in individual patients, is recommended to minimize the risk of (re)colonization/infection of the respiratory tract.

Genome-wide association with residual body weight gain in Bos indicus cattle.

Weight gain is a key performance trait for beef cat-tle; however, attention should be given to the production costs for better profitability. Therefore, a feed efficiency trait based on per-formance can be an interesting approach to improve performance without increasing food costs. To identify candidate genes and ge-nomic regions associated with residual body weight gain (RWG), we conducted a genome-wide association study (GWAS) with 720 Nellore cattle using the GRAMMAR-Gamma association test. We identified 30 significant single nucleotide polymorphisms (SNPs), especially on chromosomes 2, 8, 12, and 17. Several genes and quantitative train loci (QTLs) present in the regions identified were appointed; we highlight DMRT2 (doublesex and mab-3 related tran-scription factor 2), IFFO2 (intermediate filament family orphan 2), LNX2 (ligand of numb-protein X 2), MTIF3 (mitochondrial transla-tional initiation factor 3), and TRNAG-CCC (transfer RNA glycine anticodon CCC). The metabolic pathways that can explain part of the phenotypic variation in RWG are related to oxidative stress and muscle control.

Strategies for single nucleotide polymorphism (SNP) genotyping to enhance genotype imputation in Gyr (Bos indicus) dairy cattle: Comparison of commercially available SNP chips.

Genotype imputation is widely used as a cost-effective strategy in genomic evaluation of cattle. Key determinants of imputation accuracies, such as linkage disequilibrium patterns, marker densities, and ascertainment bias, differ between Bos indicus and Bos taurus breeds. Consequently, there is a need to investigate effectiveness of genotype imputation in indicine breeds. Thus, the objective of the study was to investigate strategies and factors affecting the accuracy of genotype imputation in Gyr (Bos indicus) dairy cattle. Four imputation scenarios were studied using 471 sires and 1,644 dams genotyped on Illumina BovineHD (HD-777K; San Diego, CA) and BovineSNP50 (50K) chips, respectively. Scenarios were based on which reference high-density single nucleotide polymorphism (SNP) panel (HDP) should be adopted [HD-777K, 50K, and GeneSeek GGP-75Ki (Lincoln, NE)]. Depending on the scenario, validation animals had their genotypes masked for one of the lower-density panels: Illumina (3K, 7K, and 50K) and GeneSeek (SGGP-20Ki and GGP-75Ki). We randomly selected 171 sires as reference and 300 as validation for all the scenarios. Additionally, all sires were used as reference and the 1,644 dams were imputed for validation. Genotypes of 98 individuals with 4 and more offspring were completely masked and imputed. Imputation algorithms FImpute and Beagle v3.3 and v4 were used. Imputation accuracies were measured using the correlation and allelic correct rate. FImpute resulted in highest accuracies, whereas Beagle 3.3 gave the least-accurate imputations. Accuracies evaluated as correlation (allelic correct rate) ranged from 0.910 (0.942) to 0.961 (0.974) using 50K as HDP and with 3K (7K) as low-density panels. With GGP-75Ki as HDP, accuracies were moderate for 3K, 7K, and 50K, but high for SGGP-20Ki. The use of HD-777K as HDP resulted in accuracies of 0.888 (3K), 0.941 (7K), 0.980 (SGGP-20Ki), 0.982 (50K), and 0.993 (GGP-75Ki). Ungenotyped individuals were imputed with an average accuracy of 0.970. The average top 5 kinship coefficients between reference and imputed individuals was a strong predictor of imputation accuracy. FImpute was faster and used less memory than Beagle v4. Beagle v4 outperformed Beagle v3.3 in accuracy and speed of computation. A genotyping strategy that uses the HD-777K SNP chip as a reference panel and SGGP-20Ki as the lower-density SNP panel should be adopted as accuracy was high and similar to that of the 50K. However, the effect of using imputed HD-777K genotypes from the SGGP-20Ki on genomic evaluation is yet to be studied.

A genomewide association mapping study using ultrasound-scanned information identifies potential genomic regions and candidate genes affecting carcass traits in Nellore cattle.

The aim of this study was to identify candidate genes and genomic regions associated with ultrasound-derived measurements of the rib-eye area (REA), backfat thickness (BFT) and rumpfat thickness (RFT) in Nellore cattle. Data from 640 Nellore steers and young bulls with genotypes for 290 863 single nucleotide polymorphisms (SNPs) were used for genomewide association mapping. Significant SNP associations were explored to find possible candidate genes related to physiological processes. Several of the significant markers detected were mapped onto functional candidate genes including ARFGAP3, CLSTN2 and DPYD for REA; OSBPL3 and SUDS3 for BFT; and RARRES1 and VEPH1 for RFT. The physiological pathway related to lipid metabolism (CLSTN2, OSBPL3, RARRES1 and VEPH1) was identified. The significant markers within previously reported QTLs reinforce the importance of the genomic regions, and the other loci offer candidate genes that have not been related to carcass traits in previous investigations.

Body condition score of Nellore beef cows: a heritable measure to improve the selection of reproductive and maternal traits.

Despite the economic importance of beef cattle production in Brazil, female reproductive performance, which is strongly associated with production efficiency, is not included in the selection index of most breeding programmes due to low heritability and difficulty in measure. The body condition score (BCS) could be used as an indicator of these traits. However, so far little is known about the feasibility of using BCS as a selection tool for reproductive performance in beef cattle. In this study, we investigated the sources of variation in the BCS of Nellore beef cows, quantified its association with reproductive and maternal traits and estimated its heritability. BCS was analysed using a logistic model that included the following effects: contemporary group at weaning, cow weight and hip height, calving order, reconception together with the weight and scores of conformation and early finishing assigned to calves at weaning. In the genetic analysis, variance components of BCS were estimated through Bayesian inference by fitting an animal model that also included the aforementioned effects. The results showed that BCS was significantly associated with all of the reproductive and maternal variables analysed. The estimated posterior mean of heritability of BCS was 0.24 (highest posterior density interval at 95%: 0.093 to 0.385), indicating an involvement of additive gene action in its determination. The present findings show that BCS can be used as a selection criterion for Nellore females.

Genetic analysis of the temperament of Nellore cattle using linear and threshold models.

Temperament is an important trait for the management and welfare of animals and for reducing accidents involving people who work with cattle. The present study aimed to estimate the genetic parameters related to the temperament score (T) and weaning weight (WW) of Nellore cattle, reared in a beef cattle breeding program in Brazil. Data were analyzed using two different two-trait statistical models, both considering WW and T: (1) a linear-linear model in which variance components (VCs) were estimated using restricted maximum likelihood; and (2) a linear-threshold model in which VCs were estimated via Bayesian inference. WW was included in the analyses of T to minimize any possible effects of sequential selection and to allow for estimation of the genetic correlation between these two traits. The heritability estimates for T were 0.21 ± 0.003 (model 1) and 0.26 (model 2, with a 95% credibility interval (95% CI) of 0.21 to 0.32). The estimated genetic correlations between WW and T were of a moderate magnitude (-0.33 ± 0.01 (model 1) and -0.34 (95% CI: -0.40, -0.28, model 2). The genetic correlations between the estimated breeding values (EBVs) obtained for the animals based on the two models were high (>0.92). The use of different models had little influence on the classification of animals based on EBVs or the accuracy of the EBVs.

Genetic relationship among reproductive traits in Nellore cattle.

In order to achieve improvements in production efficiency in livestock, herds of high sexual precocity and good fertility are needed. These traits increase the availability of animals in herd, either for sale or selection, allowing both greater selective intensity and greater genetic progress. This study aimed at estimating genetic parameters for reproductive traits measured directly in females in order to verify whether they could be used as selection criteria for genetic improvement in Nellore cows, as well as estimating the genetic relationship among these traits and scrotal circumference (SC), the traditional selection criterion for sexual precocity in cattle. In addition to SC, stayability (STAY), number of calvings at 53 months (NC53) and heifers rebreeding (HR) were studied. The (co)variances and genetic parameters were estimated using Bayesian inference. STAY, NC53 and HR were analyzed assuming a threshold model, whereas SC was analyzed with a linear model. Heritability estimated for NC53 was 0.22, and this trait was strongly and positively correlated with STAY, meaning selection for NC53 would improve productive longevity of Nellore cows. Correlations estimated between HR and STAY (≈0.97) and between HR and NC53 (≈0.99) allow an improvement on HR rates if selection was applied to traits related to longevity. Genetic correlations among SC and female reproductive traits were positive but weak, suggesting the need to use reproductive traits directly measured in females in order to obtain greater improvements in sexual precocity and longevity.

Peripheral myopization and visual performance with experimental rigid gas permeable and soft contact lens design.

PURPOSE: To evaluate the performance of two experimental contact lenses (CL) designed to induce relative peripheral myopic defocus in myopic eyes. METHODS: Ten right eyes of 10 subjects were fitted with three different CL: a soft experimental lens (ExpSCL), a rigid gas permeable experimental lens (ExpRGP) and a standard RGP lens made of the same material (StdRGP). Central and peripheral refraction was measured using a Grand Seiko open-field autorefractometer across the central 60° of the horizontal visual field. Ocular aberrations were measured with a Hartman-Shack aberrometer, and monocular contrast sensitivity function (CSF) was measured with a VCTS6500 without and with the three contact lenses. RESULTS: Both experimental lenses were able to increase significantly the relative peripheral myopic defocus up to -0.50 D in the nasal field and -1.00 D in the temporal field (p<0.05). The ExpRGP induced a significantly higher myopic defocus in the temporal field compared to the ExpSCL. ExpSCL induced significantly lower levels of Spherical-like HOA than ExpRGP for the 5mm pupil size (p<0.05). Both experimental lenses kept CSF within normal limits without any statistically significant change from baseline (p>0.05). CONCLUSIONS: RGP lens design seems to be more effective to induce a significant myopic change in the relative peripheral refractive error. Both lenses preserve a good visual performance. The worsened optical quality observed in ExpRGP was due to an increased coma-like and spherical-like HOA. However, no impact on the visual quality as measured by CSF was observed.

Genome-wide association study for feedlot average daily gain in Nellore cattle (Bos indicus).

The genome-wide association study (GWAS) results are presented for average daily gain (ADG) in Nellore cattle. Phenotype of 720 male Bos indicus animals with information of ADG in feedlots and 354,147 single-nucleotide polymorphisms (SNPs) obtained from a database added by information from Illumina Bovine HD (777,962 SNPs) and Illumina BovineSNP50 (54,609) by imputation were used. After quality control and imputation, 290,620 SNPs remained in the association analysis, using R package Genome-wide Rapid Association using Mixed Model and Regression method GRAMMAR-Gamma. A genomic region with six significant SNPs, at Bonferroni-corrected significance, was found on chromosome 3. The most significant SNP (rs42518459, BTA3: 85849977, p = 9.49 × 10(-8)) explained 5.62% of the phenotypic variance and had the allele substitution effect of -0.269 kg/day. Important genes such as PDE4B, LEPR, CYP2J2 and FGGY are located near this region, which is overlapped by 12 quantitative trait locus (QTLs) described for several production traits. Other regions with markers with suggestive effects were identified in BTA6 and BTA10. This study showed regions with major effects on ADG in Bos indicus in feedlots. This information may be useful to increase the efficiency of selecting this trait and to understand the physiological processes involved in its regulation.

Ocular dominance and visual function testing.

PURPOSE: To show the distribution of ocular dominance as measured with sensory and eye sighting methods and its potential relationship with high and low contrast LogMAR visual acuity in presbyopic subjects. METHOD: Forty-four presbyopes (48.5 ± 3.5 years) participated in this study. Ocular dominance was determined by eye sighting (hole-in-card) and sensorial (+1.50 D lens induced blur) methods. According to the dominance detected with each method (RE: right eye or LE: left eye), patients were classified in dominance type 1 (RE/RE), type 2 (RE/LE), type 3 (LE/RE) and type 4 (LE/LE). RESULTS: Baseline refractive error (MSE) was RE:-0.36 ± 1.67 D and LE:-0.35 ± 1.85 D (P = 0.930). RE was the dominant eye in 61.4% and 70.5% of times as obtained from sensorial and sighting methods, respectively. Most frequent dominance was of type 1 (52.3%), in this case the RE showed statistically significant better distance low contrast LogMAR VA (0.04 LogMAR units) compared to the LE (P < 0.05). CONCLUSIONS: The dominance was more frequent in RE in this sample. The eye sighting and sensorial methods to define ocular dominance agreed in more than half of cases. Amount of MSE was not significantly different between dominant and non-dominant eye. But in case of right dominance, the RE presented better distance low contrast VA compared to the LE.

Genetic parameters for an alternative criterion to improve productive longevity of Nellore cows.

Number of calvings at 53 mo (NC53) was proposed as an alternative selection criterion to improve productive longevity of Nellore cows. This study was carried out to estimate variance components for NC53 by assuming different models, so that the potential for using this selection criterion to improve fertility of Nellore cows could be assessed. Genetic correlations between NC53, number of calvings at 89 mo (NC89), and 2 selection indexes used in this breed were also estimated. The NC53 trait is moderately heritable (posterior mean heritability ≈ 0.17) and selecting for this criterion could improve productive longevity of Nellore cows. Greater response to selection is expected by fitting a threshold animal model for this trait, rather than a linear animal model. Greater accuracy of prediction for this criterion could be achieved by fitting a threshold-linear model, considering this trait and a selection index composed by traits evaluated at weaning and long-yearling.

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle.

Animal temperament is a trait of economic relevance and its use as a selection criterion requires the identification of environmental factors that influence this trait, as well as the estimation of its genetic variability and interrelationship with other traits. The objectives of this study were to evaluate the effect of the covariates dam age at calving (ADC), long yearling age (YA) and long yearling weight (YW) on temperament score (T) and to estimate genetic parameters for T, scrotal circumference (SC) at long YA and age at first calving (AFC) in Nellore cattle participating in a selection program. The traits were analyzed by the restricted maximum likelihood method under a multiple-trait animal model. For all traits, contemporary group was included as a fixed effect and additive genetic and residual as random effects. In addition to these effects, YA, YW and ADC were considered for analyzing T. In the case of SC and AFC, the effect of long YW was included as a covariate. Genetic parameters were estimated for and between traits. The three covariates significantly influenced T. The heritability estimates for T, SC and AFC were 0.18 ± 0.02, 0.53 ± 0.04 and 0.23 ± 0.08, respectively. The genetic correlations between T and SC, and T and AFC were -0.07 ± 0.17 and -0.06 ± 0.19, respectively. The genetic correlation estimated between SC and AFC was -0.57 ± 0.16. In conclusion, a response to selection for T, SC and AFC is expected and selection for T does not imply correlated responses with the other traits.

Out-of-plane, high strength, polymer microneedles for transdermal drug delivery.

This paper reports on the high strength of high-aspect ratio (> 50) hollow, polymer microneedles fabricated out-of-plane using a fairly repeatable fabrication process. Further, these microneedle tips were sharpened by a molding principle, with a simple anisotropic etch of silicon wafer. Also, an enhanced elegant process was explored to incorporate the mounting of the microneedle onto a platform without using any additional material, such that the bore of the microneedle is continuous with the bore of the platform in order to facilitate microfluidic delivery through the hollow needles. The high aspect ratio microneedles undergo failure at the critical load of around 4 N, while the insertion force for such a needle into agar gel, which is a fairly good equivalent of the human skin due to its inherent visco-elastic properties, is 7 mN, which translates into a safety factor (ratio of critical loading force to the maximum applied force) of greater than 500 thus, making it adequately strong for skin penetration.

Two-dimensional multi-channel neural probes with electronic depth control.

This paper presents multi-electrode arrays for in vivo neural recording applications incorporating the principle of electronic depth control (EDC), i.e., the electronic selection of recording sites along slender probe shafts independently for multiple channels. Two-dimensional (2D) arrays were realized using a commercial 0.5- µm complementary-metal-oxide-semiconductor (CMOS) process for the EDC circuits combined with post-CMOS micromachining to pattern the comb-like probes and the corresponding electrode metallization. A dedicated CMOS integrated front-end circuit was developed for pre-amplification and multiplexing of the neural signals recorded using these probes.

Hydrogel optimization towards fibroblast-friendly biomimetic coatings for implantable devices.

In this paper we present our investigations related to the optimization of hydrogels for the coating/packaging of biomedical devices. In order for hydrogels to be a viable interface/packaging material, a number of conditions must be met. We outline the tailoring of the mechanical properties of a HEMA based hydrogel by exploiting the influence of individual hydrogel components to achieve these requirements. The water sorption, the elasticity and the porosity of various hydrogel materials were tested and the effects of the different hydrogel components was determined. These components include gelatin (used as a pore generator or porogen), alginate (to influence mechanical properties) and collagen (to improve cell adhesion). We also report the results of in vitro fibroblast testing on various hydrogel types.