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African Medicus Procedures Manual : I-In French: African Index Medicus Saisie des Donnees/Manuel de Procedures

By World Health Organization

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Book Id: WPLBN0000202241
Format Type: PDF eBook
File Size: 0.4 MB
Reproduction Date: 2005

Title: African Medicus Procedures Manual : I-In French: African Index Medicus Saisie des Donnees/Manuel de Procedures  
Author: World Health Organization
Volume:
Language: English
Subject: Health., Public health, Wellness programs
Collections: Medical Library Collection, World Health Collection
Historic
Publication Date:
Publisher: World Health Organization

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Organization, W. H. (n.d.). African Medicus Procedures Manual : I-In French. Retrieved from http://hawaiilibrary.net/


Description
Medical Reference Publication

Excerpt
INTRODUCTION Ecologists have found that water velocity in streams has a great bearing on the breeding and development of bilharziasis vector snails. Careful investigation of this subject has been hampered by the difficulty of determining velocities near the periphery of the watercourse, the usual habitat of these snails. Upon review of hydraulic treatises, it was found that the subject of water velocity in canals is dealt with mainly from the engineering point of ~-iei\-; emphasis being laid on the determination of the mean velocity for calculating the rate of water flow. The distribution of water velocities within the crosssectional area of the canal is considered of a rather academic interest. There is a certain diversity of opinion among authors concerning the distribution of water velocities, and their statements regarding velocities near the periphery of the canal lack the precision required for ecological studies of the vector snails. Some of these authorities n-ill be quoted later when the results of this study are compared XI-ith available material on the subject.

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