A differential operator D commuting with an S-action is said to be rigid if the non-constant Fourier coefficients of kerD and coker D are the same. Somewhat surprisingly, the study of rigid differential operators turns out to be closely related to the problem of defining Chern numbers on singular varieties. This relationship comes into play when we make use of the rigidity properties of the com...

It is well established that hypoxia causes excess accumulation of glutamate in developing neural tissues. This study aimed to elucidate the mechanism by which glutamate can cause retinal ganglion cell (RGC) death through the N-methyl-D-aspartate (NMDA) receptors (NR) in the developing retina. One-day-old Wistar rats were exposed to hypoxia for 2 hours and then killed at different time points. N...

Exogenous bone morphogenetic proteins (Bmp) are well known to induce ectopic bone formation, but the physiological effect of Bmp signaling on normal bone is not completely understood. By deleting the receptor Bmpr1a in osteoblast lineage cells with Dmp1-Cre, we observed a dramatic increase in trabecular bone mass in postnatal mice, which was due to a marked increase in osteoblast number that wa...

Tobacco (Nicotiana tabacum L.) is an important cash crop to most farmers in Western and Central Zones of Tanzania [1]. However, the yield adversely affected by low soil fertility [2]. The nutritional requirement for provide potential yield-is high requires huge amount nitrogen (N), phosphorous (P), potassium (K) proper growth development roots [3–7]. After being transplanted fields, tobacco see...

Cynthia Feltner, MD, MPH; Ina F. Wallace, PhD; Christine E. Kistler, MASc; Manny Coker-Schwimmer, Daniel Jonas, MPH

Objective. To evaluate primary care reform (PCR) in Barcelona during the year 2000 using 3 preventive practices: anti-smoking advice, blood pressure measurement, and flu vaccination. Any inequalities of gender, age, or social class in receiving these practices are also assessed. Design. Cross-sectional, descriptive, observational study. Setting. Barcelona Health Survey, primary health care, Spa...