This volume connects current ideas and concepts about sleep functions and circadian rhythms with the search for novel target-selective sleep-wake therapeutics. To do so, it provides a timely, state-of-the-art overview of sleep-wake mechanisms in health and disease, ongoing developments in drug discovery, and their prospects for the clinical treatment of sleep-disordered patients. It particularly focuses on the concept that sleep and wakefulness mutually affect each other, and the future therapeutic interventions with either sleep- or wake-promoting agents that are expected to not only improve the quality of sleep but also the waking behavior, cognition, mood and other sleep-associated physiological functions. The chapter 'Sleep Physiology, Circadian Rhythms, Waking Performance and the Development of Sleep-Wake Therapeutics' available open access under a CC BY 4.0 license at link.springer.com

Genetic variability is an important parameter for plant breeders in any con ventional crop improvement programme. Very often the desired variation is un available in the right combination, or simply does not exist at all. However, plant breeders have successfully recombined the desired genes from cultivated crop gerrnplasm and related wild species by sexual hybridization, and have been able to develop new cultivars with desirable agronomie traits, such as high yield, disease, pest, and drought resistance. So far, conventional breeding methods have managed to feed the world's ever-growing population. Continued population growth, no further scope of expanding arable land, soil degradation, environ mental pollution and global warrning are causes of concern to plant biologists and planners. Plant breeders are under continuous pressure to improve and develop new cultivars for sustainable food production. However, it takes several years to develop a new cultivar. Therefore, they have to look for new technologies, which could be combined with conventional methods to create more genetic variability, and reduce the time in developing new cultivars, with early-maturity, and improved yield. The first report on induced mutation of a gene by HJ. Muller in 1927 was a major mi1estone in enhancing variation, and also indicated the potential applica tions of mutagenesis in plant improvement. Radiation sources, such as X-rays, gamma rays and fast neutrons, and chemical mutagens (e. g. , ethyl methane sulphonate) have been widely used to induce mutations.

Knowledge about the etiology and diagnosis as well as treatment concepts of neu- oncologic diseases is rapidly growing. This turnover of knowledge makes it dif? cult for the physician engaged in the treatment to keep up to date with current therapies. This book sets out to close the gap and pursues several innovative concepts. As a comprehensive text on neuro-oncology, its chapters are interconnected, but at the same time some chapters or subdivisions are so thoroughly assembled that the whole volume gives the impression of several books combined into one. Neuropathology is treated in an extensive and clearly structured section. The int- ested reader ? nds for each tumor entity the latest well-referenced consensus rega- ing histologic and molecular pathology. Through this “book-in-the-book” concept, information on neuropathology is readily at hand in a concise form and without ov- loading the single chapters. Pediatric neuro-oncology differs in many entities from tumors in adult patients; also, certain tumors of the CNS are typically or mainly found only in the child. Therefore, pediatric neuro-oncology was granted its own, book-like section. Tumor entities that are treated differently in children and adults are included both in the pediatric neuro-oncology section and in the general section. Entities that typically occur only in the child and adolescent are found in the pediatric section in order to avoid redundancies.