rots in maize. High yielding cultivars, increased plant densities, and improvements in soil fertility are generally Stalk lodging in maize (Zea mays L.) causes yield losses estimated accepted to have also contributed to increased stalk to range from 5 to 20% annually worldwide. Selection for rind penetrometer resistance (RPR) has proven useful in enhancing germplasm lodging. for stalk strength,...

Introduction This study evaluated whether post in vitro capacitation changes sperm could be used to estimate field fertility differences between bulls. Methods Frozen-thawed semen from five bulls (two four ejaculates per bull) previously identified as high (48.1% and 47.7%), intermediary (45.5%) or low (40.7% 43.1%) fertility, based on pregnancy AI (P/AI), were for total progressive motility, p...

Identifying the effect of differential taxation on portfolio allocation requires exogenous variation in marginal tax rates. Marginal tax rates vary with income, but income surely affects portfolio choice directly. In systems of individual taxation – like Canada’s – couples with the same household income can face different effective tax rates on capital income when labor income is distributed di...

While the molecular mechanism of membrane fusion by the influenza virus hemagglutinin (HA) protein has been studied extensively in vitro, the role of acid-dependent HA protein activation in virus replication, pathogenesis, and transmission in vivo has not been characterized. To investigate the biological significance of the pH of activation of the HA protein, we compared the properties of four ...

What are the fiscal consequences of high-skilled emigration for source countries? This paper develops methodologies for inferring these consequences and applies them to the recent sizable emigration of high-skilled workers from India to the U.S. This wave of emigration from India to the U.S. is shown to be unusually concentrated amongst the prime-age work force, the highly educated and high ear...

We address the puzzle of incomplete take-up with a unique …eld experiment in collaboration with the IRS. Speci…cally, we test the role of program information (regarding bene…ts, costs, and rules), informational complexity, and stigma on response to experimental mailings notifying 35,050 eligible individuals of $26m in unclaimed EITC bene…ts. We …nd residual increases in take-up due to the mere ...

I quantitatively study the optimal capital income taxation in the general equilibrium overlapping generations model with uninsurable idiosyncratic income shocks and with housing and flnancial assets. Following key characteristics of housing are explicitly modeled: (i) housing is held for the dual purpose of consumption and savings, (ii) housing can be either owned or rented, (iii) if owned, hou...

Taxes, Wages and Working Hours This paper presents estimates of individuals’ responses in hourly wages to changes in marginal tax rates. Estimates based on register panel data of Swedish households covering the period 1992 to 2007 produce significant but relatively small net-of-tax rate elasticities. The results vary with family type, with the largest elasticities obtained for single males and ...