منابع مشابه
Computed Tomography in the Diagnosis of Lesions in and Around the Saddle Area
Computed tomography is the method of choice for initial evaluation of pa tints with potential suprasellar masses. In our experience during the last 2 years C.T. has proved reliable for detecting or rulling out the presence of a suprasellar mass. It shows the direction and degree of parasellar extension and the presence of any calcific or cystic component of the lesion. When C.T. was negat...
متن کاملMedicinal chemistry endeavors around the phytocannabinoids.
Over the past 50 years, a considerable research in medicinal chemistry has been carried out around the natural constituents of Cannabis sativa L. Following the identification of Delta9-tetrahydrocannabinol (Delta9-THC) in 1964, critical chemical modifications, e.g., variation of the side chain at C3 and the opening of the tricyclic scaffold, have led to the characterization of potent and cannab...
متن کاملSpinning around in Transition-Metal Chemistry.
The great diversity and richness of transition metal chemistry, such as the features of an open d-shell, opened a way to numerous areas of scientific research and technological applications. Depending on the nature of the metal and its environment, there are often several energetically accessible spin states, and the progress in accurate theoretical treatment of this complicated phenomenon is p...
متن کاملX-ray chemistry in the envelopes around young stellar objects
We present chemical models of the envelope of a young stellar object (YSO) exposed to a central X-ray source. The models are applied to the massive star-forming region AFGL 2591 for different X-ray fluxes. Model results for this region show that the X-ray ionization rate with and without the effects of Compton scattering differs by only a few percent and the influence of Compton scattering on t...
متن کاملChemistry in the Envelopes around Massive Young Stars
Recent observational studies of intermediateand high-mass star-forming regions at submillimeter and infrared wavelengths are reviewed, and chemical diagnostics of the different physical components associated with young stellar objects are summarized. Procedures for determining the temperature, density and abundance profiles in the envelopes are outlined. A detailed study of a set of infrared-br...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 2006
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.314.5801.895d