منابع مشابه
Safe in the Sun
سرطانهای جلدی را می توان به انواع پیش بدخیم و بدخیم تقسیم نمود. شایعترین ضایعه جلدی پیش بدخیم، کراتوز آفتابی نام دارد که بصورت ضایعات خشک و دلمه دار جلدی بروز می کنند - لنتیگو آفتابی یک ضایعه پیش بدخیم دیگرن است که بصورت لکه های قهوه ای و صاف (غیر برجسته روی پوست مشاهده می شوند) ضایعات پیش بدخیم در صورت عدم درمان می توانند بدخیم شوند.
متن کاملIs the Sun a Random Star?
The properties of our star may be associated with special prerequisites for life. By comparing our Sun to other stars in our galaxy, we may be able to identify such prerequisites. If our star is typical, stellar conditions appropriate for life, and life itself may be common in the Universe. On the other hand, if the Sun is atypical, conditions appropriate for life may be uncommon. Here we descr...
متن کاملVitamin D Status of Tehran Taxi Drivers: How Efficient Is the Occupational Exposure to Sun? A Case-control Study
Background and Objectives: Day-shift taxi drivers have a long duration of direct sun exposure. However, the efficiency of this occupational exposure in vitamin D synthesis has not been addressed yet. The aim of this study was to assess the vitamin D status of taxi drivers in Tehran, and examine vitamin D status association with some anthropometric and circulating biomarkers. Materials and Meth...
متن کاملWhy the Salpeter approximation is not valid in the Sun
We review the derivation of the electrostatic screening effect from first principles. We show that under the conditions prevailing in the Sun the number of particles in the Debye sphere is of the order of unity. Consequently, fluctuations play a dominant role in the screening process and lead to an energy exchange between the scattering particles and the surrounding plasma that depends on the e...
متن کاملWhat Is the Neon Abundance of the Sun?
We have evolved a series of thirteen complete solar models that utilize different assumed heavy element compositions. Models that are based upon the heavy element abundances recently determined by Asplund, Grevesse, & Sauval (2005) are inconsistent with helioseismological measurements. However, models in which the neon abundance is increased by 0.4-0.5 dex to [Ne/H] = 8.29 ± 0.05 are consistent...
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ژورنال
عنوان ژورنال: Tydskrif vir Letterkunde
سال: 2018
ISSN: 2309-9070,0041-476X
DOI: 10.17159/2309-9070/tvl.v.40i0.4914