Characteristics of a Broadband Dye Laser Using Pyrromethene and Rhodamine Dyes

A broadband dye laser pumped by a frequency-doubled Nd:YAG laser with a full-width half-maximum (FWHM) from 592 to 610 nm was created for the use in a dual-pump broadband CARS system called WIDECARS. The desired broadband dye laser was generated with a mixture of Pyrromethene dyes as an oscillator gain medium and a spectral selective optic in the oscillator cavity. A mixture of Rhodamine dyes were used in the amplifier dye cell. To create this laser a study was performed to characterize the spectral behavior of broadband dye lasers created with Rhodamine dyes 590, 610, and 640, Pyrromethene dyes 597 and 650 as well as mixture of these dyes

Twenty-Four-Month Longitudinal Study Suggests Little to No Horizontal Gene Transfer In Situ between Third-Generation Cephalosporin-Resistant \u3ci\u3eSalmonella\u3c/i\u3e and Third-Generation Cephalosporin-Resistant \u3ci\u3eEscherichia coli\u3c/i\u3e in a Beef Cattle Feedyard

Third-generation cephalosporins (3GCs) are preferred treatments for serious human Salmonella enterica infections. Beef cattle are suspected to contribute to human 3GC-resistant Salmonella infections. Commensal 3GC-resistant Escherichia coli are thought to act as reservoirs of 3GC resistance because these strains are isolated more frequently than are 3GC-resistant Salmonella strains at beef cattle feedyards. During each of 24 consecutive months, four samples of pen surface material were obtained from five pens (N = 480) at a Nebraska feedyard to determine to the contribution of 3GC-resistant E. coli to the occurrence of 3GC-resistant Salmonella. Illumina whole genome sequencing was performed, and susceptibility to 14 antimicrobial agents was determined for 121 3GC-susceptible Salmonella, 121 3GC-resistant Salmonella, and 203 3GCresistant E. coli isolates. 3GC-susceptible Salmonella isolates were predominantly from serotypes Muenchen (70.2%) and Montevideo clade 1 (23.1%). 3GC-resistant Salmonella isolates were predominantly from serotypes Montevideo clade 2 (84.3%). One bla gene type (blaCMY-2) and the IncC plasmid replicon were present in 100 and 97.5% of the 3GC-resistant Salmonella, respectively. Eleven bla gene types were detected in the 3GC-resistant E. coli, which were distributed across 42 multilocus sequence types. The blaCMY-2 gene and IncC plasmid replicon were present in 37.9 and 9.9% of the 3GC-resistant E. coli, respectively. These results suggest that 3GC resistance in Salmonella was primarily due the persistence of Salmonella Montevideo clade 2 with very minimal or no contribution from 3GC-resistant E. coli via horizontal gene transfer and that 3GCresistant E. coli may not be a useful indicator for 3GC-resistant Salmonella in beef cattle production environments

Book reviews

Teaching/Communication/Extension/Profession,

Liver ‘organ on a chip’

© 2017 The liver plays critical roles in both homeostasis and pathology. It is the major site of drug metabolism in the body and, as such, a common target for drug-induced toxicity and is susceptible to a wide range of diseases. In contrast to other solid organs, the liver possesses the unique ability to regenerate. The physiological importance and plasticity of this organ make it a crucial system of study to better understand human physiology, disease, and response to exogenous compounds. These aspects have impelled many to develop liver tissue systems for study in isolation outside the body. Herein, we discuss these biologically engineered organoids and microphysiological systems. Keywords: Microphysiologic systems; Organoids; 3D culture systemsNational Institutes of Health (U.S.) (Grant UH3TR000496)National Institutes of Health (U.S.) (Grant UH3TR000503

The patient patient: The importance of knowing your navigator

In Ontario, Diagnostic Assessment Programs (DAPs) have been implemented to improve the quality of care patients receive during the diagnostic phase of the cancer journey. Patient navigators play a critical role in this model by coordinating care and providing information and support to patients and their families. The objectives of this study were 1) to determine whether patient navigation in DAPs is associated with a better patient experience and 2) to examine whether patient navigation in DAPs modifies the effect of wait times and patient volumes on patient experience. Data reflecting patients’ experience within the DAP were collected via survey and an average experience score was calculated for each region. To ascertain the relationship between patient experience, wait times and volumes, correlation coefficients were computed between regional patient experience scores and total regional patient volumes and between regional patient experience score and regional diagnostic wait times. To understand the impact of navigators on the patient experience, the sample was subdivided according to whether or not the respondent reported knowing their navigator. Patients who knew their navigator rated their experience significantly better than those who did not. For those who did not know their navigator, there was an inverse and significant correlation between patient experience scores and wait times; patients in regions with long waits had poorer experience scores overall. Patients who knew their navigator reported consistently good experience regardless of their diagnostic wait. The navigator appears to mitigate the negative impact of longer wait times on experience

Romantic Relationship Experiences from Late Adolescence to Young Adulthood: The Role of Older Siblings in Mexican-Origin Families

Youth\u27s experiences with romantic relationships during adolescence and young adulthood have far reaching implications for future relationships, health, and well-being; yet, although scholars have examined potential peer and parent influences, we know little about the role of siblings in youth\u27s romantic relationships. Accordingly, this study examined the prospective longitudinal links between Mexican-origin older and younger siblings\u27 romantic relationship experiences and variation by sibling structural and relationship characteristics (i.e., sibling age and gender similarity, younger siblings\u27 modeling) and cultural values (i.e., younger siblings\u27 familism values). Data from 246 Mexican-origin families with older (M = 20.65 years; SD = 1.57; 50% female) and younger (M = 17.72 years; SD = .57; 51% female) siblings were used to examine the likelihood of younger siblings\u27 involvement in dating relationships, sexual relations, cohabitation, and engagement/marriage with probit path analyses. Findings revealed older siblings\u27 reports of involvement in a dating relationship, cohabitation, and engagement/marriage predicted younger siblings\u27 relationship experiences over a two-year period. These links were moderated by sibling age spacing, younger siblings\u27 reports of modeling and familism values. Our findings suggest the significance of social learning dynamics as well as relational and cultural contexts in understanding the links between older and younger siblings\u27 romantic relationship experiences among Mexican-origin youth

The effect of FTO variation on increased osteoarthritis risk is mediated through body mass index : a mendelian randomisation study

Objective: Variation in the fat mass and obesity-associated (FTO) gene influences susceptibility to obesity. A variant in the FTO gene has been implicated in genetic risk to osteoarthritis (OA). We examined the role of the FTO polymorphism rs8044769 in risk of knee and hip OA in cases and controls incorporating body mass index (BMI) information. Methods: 5409 knee OA patients, 4355 hip OA patients and up to 5362 healthy controls from 7 independent cohorts from the UK and Australia were genotyped for rs8044769. The association of the FTO variant with OA was investigated in case/control analyses with and without BMI adjustment and in analyses matched for BMI category. A mendelian randomisation approach was employed using the FTO variant as the instrumental variable to evaluate the role of overweight on OA. Results: In the meta-analysis of all overweight (BMI≥25) samples versus normal-weight controls irrespective of OA status the association of rs8044769 with overweight is highly significant (OR[CIs] for allele G=1.14 [01.08 to 1.19], p=7.5×10−7). A significant association with knee OA is present in the analysis without BMI adjustment (OR[CIs]=1.08[1.02 to 1.14], p=0.009) but the signal fully attenuates after BMI adjustment (OR[CIs]=0.99[0.93 to 1.05], p=0.666). We observe no evidence for association in the BMI-matched meta-analyses. Using mendelian randomisation approaches we confirm the causal role of overweight on OA. Conclusions: Our data highlight the contribution of genetic risk to overweight in defining risk to OA but the association is exclusively mediated by the effect on BMI. This is consistent with what is known of the biology of the FTO gene and supports the causative role of high BMI in OA