Tax Policy and Returns to Education

This paper considers how asymmetric tax treatment, where labour market earnings are taxed but household production is untaxed, aspects educational choice and labour supply. We show that taxes on labour market earnings can generate a large (non-marginal) switch to home production and the ensuing deadweight losses are large. Using a cross-country panel, we find that gender differences in labour supply responses to tax policy can explain differences in aggregate labour supply and years of education across countries.Increasing returns; tax policy; gender; labour supply; education

Electron microscopic measurement of the size of the optical focus in laser scanning microscopy

We describe a method for measuring the lateral focal spot size of a multiphoton laser scanning microscope (LSM) with unprecedented accuracy. A specimen consisting of an aluminum film deposited on a glass coverslip was brought into focus in a LSM and the laser intensity was then increased enough to perform nanoablation of the metal film. This process leaves a permanent trace of the raster path usually taken by the beam during the acquisition of an optical image. A scanning electron microscope (SEM) was then used to determine the nanoablated line width to high accuracy, from which the lateral spot size and hence resolution of the LSM can be determined. To demonstrate our method, we performed analysis of a multiphoton LSM at various infrared wavelengths, and we report measurements of optical lateral spot size with an accuracy of 20 nm, limited only by the resolution of the SEM

Does Wheat Cultivar Choice Affect Crop Quality and Soil Microbial Communities in Cropping Systems?

Wheat (Triticum aestivum L.) cultivars may have differential effects on soil microbial communities and the breadmaking quality of harvested grain. We compared six Canadian spring wheat cultivars under organic and conventional management systems for yield, breadmaking quality and soil phospholipid fatty acid analysis (PLFA) profile. Yields were lower, but protein levels were higher in the organic system. Cultivars differed for quality traits, but all cultivars had acceptable levels for processing. There were small differences in PLFA profiles for cultivars in the conventional system, but none in the organic system. More significant correlations between grain quality and PLFA measures were present in the organic system. Protein levels and breadmaking quality at least equal to conventional systems can be achieved in organic systems. Wheat cultivars differed for grain quality in both organic and conventional systems, and culivars altered the soil microbial profile in conventional systems. Microbes may play a greater role in determining crop quality in organic systems than in conventional systems

Applying the Biopsychosocial Model: Factors Associated with Depression in Mexican-American Adults

Although professionals in psychiatry, psychology and medicine claim to endorse the biopsychosocial model as proposed by George L. Engel (1977), clinicians in all three fields still tend to underutilize it. Some academics have also criticized the model for its inadequate emphasis on cultural contextualization. To improve upon the model, I sought to empirically establish the relationship between culturally-specific social factors and psychological disorder, in this case depressive symptoms in Mexican-American adults. Eighty-six Mexican-American participants living on the US-Mexico border completed scales measuring depressive symptoms, bidirectional acculturation, living situation, diabetes, and health beliefs regarding the origins of diabetes. The results revealed that diabetes, acculturation, and gender were not associated with depressive symptoms in this population, even when controlling for mental health biases. This finding is in contrast to findings from other literature that associated diabetes, low acculturation and gender with depression in Hispanic adults. Extended family cohabitation was also not associated with lower numbers of depressive symptoms, despite the importance of familism and the extended family unit in Mexican-American culture. Unemployment was significantly related to number of depressive symptoms in both genders. There was no significant relationship between acculturation and health beliefs. These results indicate the importance of studying psychological disorders within the context of specific population groups that transcend vague censual terms. The discussion addresses methodological concerns and further directions for research concerning gender roles, chronic illness, depression and out-of-home employment in Mexican-American adults

Chirality and the angular momentum of light

Chirality is exhibited by objects that cannot be rotated into their mirror images. It is far from obvious that this has anything to do with the angular momentum of light, which owes its existence to rotational symmetries. There is nevertheless a subtle connection between chirality and the angular momentum of light. We demonstrate this connection and, in particular, its significance in the context of chiral light–matter interactions

Interiorism as a Means to Go Forward in Designing for the Adaptable City

In the context of the city, we must—especially today—study the types of spaces cities present as public, free and open.  With a notion of interiorism, the goals are to explain how urban spaces act as interiors, and why it is important to expose the qualities and characters that compose and define them.  The pedagogy mixed with theory and reseach presented in this essay is intended for practitioners and students to gaine new awareness.  We worked through a series of local and global urban interior field work research scenarios, a multi-disciplinary reading list of urbanists, sociologists, designers, practitioners, journalists and other critics’ writings that culminated with Sketch Problem/Charrette exercise focusing on a global urban locale. These designs express an forward thinking positive attitude concerning the pandemic and the global spaces that are to be re-adapted