نتایج جستجو برای: 2 over the sahara globally
تعداد نتایج: 16557955 فیلتر نتایج به سال:
The drought recorded in 1970s and 1980s, particularly the Sahara Sahel region has greatly affected population as well economies eco-systems of this area. In 2007, African Union launched a Pan-African program, Great Green Wall for Sahara, Initiative (GGWSSI) to reverse land degradation desertification by planting wall trees stretching from Dakar Djibouti. objective is improve food security, supp...
The Sahara experienced several humid episodes during the late Quaternary, associated with the development of vast fluvial networks and enhanced freshwater delivery to the surrounding ocean margins. In particular, marine sediment records off Western Sahara indicate deposition of river-borne material at those times, implying sustained fluvial discharges along the West African margin. Today, howev...
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...
Kröpelin et al. (Research Articles, 9 May 2008, p. 765) interpreted a sediment record from Lake Yoa in the east-central part of North Africa as support for a weak biogeophysical climate-vegetation feedback in the Sahara during the mid-Holocene. We argue that the new data do not invalidate earlier modeling results on strong land-atmosphere coupling in the Western Sahara for which the Lake Yoa re...
Background and purpose: Leishmaniasis is an important tropical disease in Iran and the world. Despite extensive effort to make a vaccine, no success was achieved. Moreover, routine methods have failed to control and cut the spread of this disease. Hence, the major aim of this study was to identify and determine the Leishmania infections in the vector and the ecological and biological criteria o...
introduction acetic acid bacteria are large group of obligate aerobic gram negative bacteria with the ability to oxidize ethanol to acetic acid (1). they are widely distributed in natural habitats and classified in family acetobacteraceae. members of this family are useful in industrial production of vinegar(2). acetic acid bacteria (aab) can use substrates as glucose, ethanol, lactate or glyc...
[1] Each summer large amounts of mineral dust from the Sahara are transported across the Atlantic and arrive at the Caribbean with far-reaching implications for climate in this region. In this paper we analyze summer season interannual variability of North African mineral dust over the Caribbean using the Total Ozone Mapping Spectrometer (TOMS)/Nimbus 7 (1979–1992) and TOMS/Earth Probe (1998–20...
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