منابع مشابه
New July Sahara
Awareness and knowledge about HIV mother-to-child transmission (MTCT) and preventive measures in different population groups and health personnel were analysed in future intervention areas in western Uganda and southwestern Tanzania. In Uganda, a total of 751 persons (440 clients of antenatal and outpatient clinics, 43 health workers, 239 villagers, 29 traditional birth attendants) and in Tanza...
متن کاملRainfall regimes of the Green Sahara
During the "Green Sahara" period (11,000 to 5000 years before the present), the Sahara desert received high amounts of rainfall, supporting diverse vegetation, permanent lakes, and human populations. Our knowledge of rainfall rates and the spatiotemporal extent of wet conditions has suffered from a lack of continuous sedimentary records. We present a quantitative reconstruction of western Sahar...
متن کاملDrought in the sahara: insufficient biogeophysical feedback?
5 C K H u n n ~ r f o r dJ U'ilill M a ~ ~ a n e n ~ e n i latitudinal averages obscure pertinent spa28. 141 ( 1964). I. I . I . LlcMillan. J. W~idl . .Mana,cement 28. 702 6, R , ,4, ~ l J , E~,rp,~ h ~~25 (197 1). ~ 1 , , tial and temporal variationi. Although the ~ ~ ~1 7 . (1964) 7. H . W. Bcnnetts. C . J . Cndcruood , F.. I Shier. precipitation pattern depends most 2. W. .I. F ranc~s , ibid...
متن کاملFlooding along the river
Rock-a-bye bone marrow Chemotherapy saves the lives of many cancer patients. However, it is a difficult treatment that induces many major side effects, with one of the most common being myelosuppression—depletion of bone marrow cells. The consequences of myelosuppression include anemia, thrombocytopenia, and neutropenia, all of which can cause severe complications and delay subsequent courses o...
متن کاملThe Megageomorphology of the Radar Rivers of the Eastern Sahara
The Eastern Sahara (Fig. i) is devoid of surface drainage -this unusual characteristic distinguishes its morphology from that of most other desert regions where running water dominates landscape development (Peel, 1939). Cyclic aridity, which is responsible for the obscuring eolian blankets and wind-erosion effects, had set in by the Pliocene-Pleistocene transition, about 2 million years ago (W...
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ژورنال
عنوان ژورنال: Science
سال: 1886
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-8.185.165-a