Acknowledgements Grateful acknowledgement is made to the following sources for permission to reproduce material in this course: The content acknowledged below is Proprietary and used under licence (not subject to Creative Commons licence). See Terms and Conditions. These extracts are taken from DD208 © 2008 The Open University. Course image: Michelle in Flickr m
1.8 Maintenance Databases are one of the more enduring software engineering artefacts; it is not uncommon to find database implementations whose use can be traced back for 15 years or more. Consequently, maintenance of the database is a key issue. Maintenance can take three main forms: Operational maintenance, where the performance of the database is monitored. If it falls below some acceptable standard, then reorganisation of the database, usuall
STS-133 Daily Mission Recap - Flight Day 7
A video recap of flight day 7 of the STS-133 mission of space shuttle Discovery to the International Space Station.
1.3.4 Hormonal control of sperm production The most important hormone involved in controlling sperm production is a steroid called testosterone. This is produced in the testis itself, by the Leydig cells (see Figure 12a). The testosterone is released from the Leydig cells between the tubules, and taken up by the neighbouring Sertoli cells. The Leydig cells are stimulated to make testosterone by two other hormones, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which are both produced by the pituitary gland and
Acknowledgements Amanda Burrows is a graduate of Laban and gained an MA in Education from The Open University. She has taught dance in secondary schools, FE colleges, universities and in community settings. Amanda is currently Head of Curriculum for Visual, Performing Arts and Media at Grantham College, and has produced materials for the Open Univerity's Teachandlearn.net, repurposed here for openlearn. Except for third party materials and otherwise stated (see Author(s):
One Minute Languages - Schedules
This flyer provides details on publication dates for each of the new One Minute Languages courses released between September and December 2008.Author(s):
1.1.4 Le rôle du touriste
Activité 4