Nitric Oxide in the E-region*
نویسنده
چکیده
-Rocket and satellite studies have demonstrated that nitric oxide (NO) in the thermosphere is almost always more abundant at higher than at lower latitudes. The ultraviolet nitric oxide spectrometer (UVNO) on the Atmosphere Explorer C (AE-C) spacecraft observed longitudinal asymmetries in thermospheric NO with greater abundances existing in the longitudinal sector associated with the magnetic poles of both hemispheres. This asymmetry persists even in geomagnetic coordinates. In this paper, we suggest an explanation for the longitudinal asymmetry, using neutral parcel trajectories calculated from the NCAR thermospheric general circulation model (TGCM). It is evident from a study of these calculated trajectories that certain longitudes are favored for equatorward transport out of the auroral zone in the E-region. These favored longitudes are those associated with the magnetic poles, where NO is most abundant.
منابع مشابه
Inhibition of nitric oxide synthase activity improves focal cerebral damage induced by cerebral ischemia/reperfusion in normotensive rats
Introduction: Nitric oxide seems to play a dual role in ischemia/reperfusion injury. Few studies have investigated whether it exacerbates or improves brain edema. In the present study, we inhibited the activity of nitric oxide synthase by L-NAME and evaluated the cerebral infarct volume, tissue swelling and brain edema, alongside the measurement of blood flow of the ischemic region. Methods...
متن کاملP-95: Effect of Nano Silver on Nitric Oxide Production in Chicken's Sertoli Cells
Background: Chicken sertoli cells are a model to evaluate the effects of toxic Materialss. These cells can actively proliferate in the in vitro conditions and they are able to passage several times. Because of the widespread use of nanosilver in life and also few studies on the effects of these Materialss on different cell lines, evaluation of its toxic effects is felt. Mechanism of nanosilver ...
متن کاملMeasurement of Renal Vitamin E for Assessment of Iron and Nitric Oxide Interaction in Rats
Oxidative stress has been implicated as an important factor in induction of many disorders such as nephropathy and cancer. Iron by producing hydroxyl radical can cause this kind of stress. On the other hand nitric oxide (NO) when its concentration is high results in oxidative stress. Iron and NO have some interactions in each other function but there is no total agreement on this. For example i...
متن کاملIncreasing of serum nitric oxide metabolites in chicken Eimeria infection
In order to determine the involvement of nitric oxide in the pathogenesis of coccidiosis induced by Eimeria, 30 chickens were challenged with mixed sporulated oocysts of four species of Eimeria (E. acervulina, E. maxima, E. necatrix, and E. tenella) at 26 days of age. There was an increasing of oocyst shedding in the infected birds at 6, 10 and 14 days post-infection. Histopathological examinat...
متن کاملEffect of 17-? Estradiol on the Expression of Inducible Nitric oxide Synthase in Parent and Tamoxifen Resistant T47D Breast Cancer Cells
Indirect evidence suggests that estrogen is involved in the etiology of breast cancer. Estrogen is also thought to modulate nitric oxide (NO) in human breast tumor tissue via regulation of inducible nitric oxide synthase (iNOS). Objectives of this study were to determine whether estradiol (E2) affects iNOS expression level in breast cancer cells and to study the effect of various concentrations...
متن کاملEffect of 17-? Estradiol on the Expression of Inducible Nitric oxide Synthase in Parent and Tamoxifen Resistant T47D Breast Cancer Cells
Indirect evidence suggests that estrogen is involved in the etiology of breast cancer. Estrogen is also thought to modulate nitric oxide (NO) in human breast tumor tissue via regulation of inducible nitric oxide synthase (iNOS). Objectives of this study were to determine whether estradiol (E2) affects iNOS expression level in breast cancer cells and to study the effect of various concentrations...
متن کامل