Acht Vortr Ge Ber China

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Vortr Ge Ber R Mische Geschichte An Der Universit T Zu Bonn Gehalten

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Author : Meyer Isler
language : de
Publisher: Рипол Классик
Release Date :

Vortr Ge Ber R Mische Geschichte An Der Universit T Zu Bonn Gehalten written by Meyer Isler and has been published by Рипол Классик this book supported file pdf, txt, epub, kindle and other format this book has been release on with History categories.

Experimental Techniques In Plant Disease Epidemiology

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Author : Jürgen Kranz
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Experimental Techniques In Plant Disease Epidemiology written by Jürgen Kranz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.

Most books on epidemiology have treated the subject from a statistical, mathematical or computer applicational point of view. However, experiments must be performed first to provide the data for models which in turn can then be proven by further experimentation. This mutual interplay of theory and empirics gives epidemiology its scientific thrust and charm. This book provides a choice of methods for varying applications and objectives, covering all important aspects for the designing of experiments. Furthermore, the reader is supplied with solutions to his experimental problems and many "tricks of the trade". The newcomer to the field will also profit by this methodology guide.

Insects And Climate

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Author : Sir Boris Petrovich Uvarov
language : en
Publisher:
Release Date : 1931

Insects And Climate written by Sir Boris Petrovich Uvarov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1931 with Beneficial insects categories.

Bibliography Of Agriculture

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Author :
language : en
Publisher:
Release Date : 1966

Bibliography Of Agriculture written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Agriculture categories.

Missing Persons

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Author : Karen Shalev Greene
language : en
Publisher: Taylor & Francis
Release Date : 2016-10-14

Missing Persons written by Karen Shalev Greene and has been published by Taylor & Francis this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-14 with Social Science categories.

A missing person is an individual whose whereabouts are unknown and where there is some concern for his or her wellbeing. In the UK, around 250,000 people are reported missing every year, with the majority being children under the age of 18. Despite the fact that missing persons are a social phenomenon which encompasses vast areas of interest, relatively little is known about those who go missing, what happens to them while they are missing, and what can be done to prevent these incidents from occurring. This groundbreaking book brings together for the first time ideas and expertise across this vast subject area into one interconnected publication. It explores the subjects of missing children, missing adults, the investigative process of missing person cases, and the families of missing persons. Those with no prior knowledge or professionals with focused knowledge in some areas will be able to expand their understanding of a variety of topics relevant to this field through detailed chapters which advance our understanding of this complex phenomenon, discuss what is unknown, and suggest the best and most important steps forward to further advance our knowledge.

Biotechnology And Ecology Of Pollen

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Author : David L. Mulcahy
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Biotechnology And Ecology Of Pollen written by David L. Mulcahy and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.

In Recognition of the Forgotten Generation D. L. MULCAHyl Pollen was long believed to serve primarily a single function, that of delivering male gametes to the egge A secondary and generally overlooked value of pollen is that it serves to block the transmission of many defective alleles and gene combinations into the next generation. This latter function comes about simply because pollen tubes carrying defective haploid genotypes frequently fail to complete growth through the entire length of the style. However, the beneficial consequences of this pollen selection are diluted by the fact that the same deleterious genotypes are often transmitted through the egg at strictly mendelian frequencies (Khush, 1973). Gene expression in the pollen might thus at least appear to be a phenomenon of trivial consequence. Indeed, Heslop-Harrison (1979) rightly termed the gametophytic portion of the angiosperm life cycle, the "forgotten generation." This neglect, however, came about despite subtle but constant indications that pollen is the site of intense gene activity and selection. For example, Mok and Peloquin (1975) demonstrated that relatively heterozygous diploid pollen shows heterotic characteristics whereas relatively homozygous diploid pOllen does not. This was proof positive that genes are expressed (that is, transcribed and translated) in the pollen. 1 Department of Botany, University of Massachusetts Amherst, MA 01003, USA viii However, the implications for pollen biology of even this recent and well known study were not widely recognized.

Durability Of Disease Resistance

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Author : Th. Jacobs
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-02-02

Durability Of Disease Resistance written by Th. Jacobs and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-02 with Science categories.

From February 24 -28, 1992 an international symposium on Durability of Disease Resistance was held at the International Agricultural Centre in Wageningen, the Netherlands. The symposium, organized by the Department of Plant Breeding of Wageningen Agricultural University and the Centre for Plant Breeding and Repro duction Research, CPRO-DLO, was part of the DGIS funded programme Durable Resistance in Developing Countries. Without any form of prevention or protection nearly all crops will be seriously or even severely damaged by a range of pathogens. In modern agriculture man has been able to control many if not most pathogens using i) pesticides, ii) phyto sanitary methods such as control of seed and plant material in order to start a crop disease free, iii) agronomic measures such as crop rotation, iv) disease resis tance or combinations of these measures. Over the years the use of pesticides has increased enormously and so did the pro blems associated with pesticide use, such as environmental pollution and building of resistance and tolerance to these pesticides in the pathogens. The use of resis tance too increased strongly over the years and here too problems arose.

Schmidt S Jahrbuecher

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Author :
language : en
Publisher:
Release Date : 1859

Schmidt S Jahrbuecher written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1859 with categories.

Arctic And Alpine Biodiversity Patterns Causes And Ecosystem Consequences

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Author : F.Stuart III Chapin
language : en
Publisher: Springer
Release Date : 2012-02-26

Arctic And Alpine Biodiversity Patterns Causes And Ecosystem Consequences written by F.Stuart III Chapin and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-26 with Science categories.

As human populations expand and have increasing access to technol ogy, two general environmental concerns have arisen. First, human pop ulations are having increasing impact on the earth system, such that we are altering the biospheric carbon pools, basic processes of elemental cycling and the climate system of the earth. Because of time lags and feedbacks, these processes are not easily reversed. These alterations are occurring now more rapidly than at any time in the last several million years. Secondly, human activities are causing changes in the earth's biota that lead to species extinctions at a rate and magnitude rivaling those of past geologic extinction events. Although environmental change is potentially reversible at some time scales, the loss of species is irrevo cable. Changes in diversity at other scales are also cause for concern. Habitat fragmentation and declines in population sizes alter genetic di versity. Loss or introduction of new functional groups, such as nitro gen fixers or rodents onto islands can strongly alter ecosystem processes. Changes in landscape diversity through habitat modification and frag mentation alter the nature of processes within and among vegetation patches. Although both ecological changes altering the earth system and the loss of biotic diversity have been major sources of concern in recent years, these concerns have been largely independent, with little concern for the environmental causes the ecosystem consequences of changes in biodiversity. These two processes are clearly interrelated. Changes in ecological systems cause changes in diversity.

Orientalische Bibliographie

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Author :
language : de
Publisher:
Release Date : 1897

Orientalische Bibliographie written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1897 with Bibliography categories.