When did 1989 end?

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Viral Encephalitis in England, 1989–1998: What Did We Miss?

We analyzed hospitalizations in England from April 1, 1989, to March 31, 1998, and identified approximately 700 cases, 46 fatal, from viral encephalitis that occurred during each year; most (60%) were of unknown etiology. Of cases with a diagnosis, the largest proportion was herpes simplex encephalitis. Using normal and Poisson regression, we identified six possible clusters of unknown etiology...

متن کامل

When did oxygenic photosynthesis evolve?

The atmosphere has apparently been oxygenated since the 'Great Oxidation Event' ca 2.4 Ga ago, but when the photosynthetic oxygen production began is debatable. However, geological and geochemical evidence from older sedimentary rocks indicates that oxygenic photosynthesis evolved well before this oxygenation event. Fluid-inclusion oils in ca 2.45 Ga sandstones contain hydrocarbon biomarkers ev...

متن کامل

When did medicines become essential?

Expanding access to essential medicines has become one of the most visible challenges of global health delivery. Only a half-century ago, however, the role of medicines in international public health was far less obvious. Indeed, the original 1946 Constitution of the World Health Organization (WHO) barely mentioned medicines. 1 How did access to drugs assume such a central role within global he...

متن کامل

What did they know, and when did they know it?

voted to ease monetary policy, which was widely reported as a lowering of interest rates. Although some interest rates fell with the Fed' s action, the declines were generally small, and over succeeding months market interest rates tended to rise. The yield on the Treasury' s 10-year note, for example, which had been 5.63 percent on January 30, and which closed at 5.60 percent on January 31, st...

متن کامل

The universe at z > 5: when and how did the "dark age" end?

This paper considers how the first subgalactic structures produced the UV radiation that ionized the intergalactic medium before z = 5 and the "feedback" effects of the UV radiation on structure formation. The first "pregalaxies" may eventually be detectable by their direct UV emission, with characteristic spectral features at Lyman alpha; high-z supernovae may also be detectable. Other probes ...

متن کامل

ذخیره 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: Social Science Information

سال: 2020

ISSN: 0539-0184,1461-7412

DOI: 10.1177/0539018420936043