An Introduction to a Scandinavian Pollen Flora PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download An Introduction to a Scandinavian Pollen Flora PDF full book. Access full book title An Introduction to a Scandinavian Pollen Flora by Gunnar Erdtman. Download full books in PDF and EPUB format.
Author: Gunnar Erdtman
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 194
Get Book
Book Description
Author: Gunnar Erdtman
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 194
Get Book
Book Description
Author: Gunnar Erdtman
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 89
Get Book
Book Description
Author: Gunnar Erdtman
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 150
Get Book
Book Description
Author: W. Punt
Publisher: Elsevier
ISBN: 1483289680
Category :
Languages : en
Pages : 145
Get Book
Book Description
The Northwest European Pollen Flora
Author: G. Erdtman
Publisher: Read Books Ltd
ISBN: 1447494768
Category : Science
Languages : en
Pages : 260
Get Book
Book Description
AN INTRODUCTION TO POLLEN ANALYSIS by G. ERDTMAN. FOREWORD: It has long been the custom among those making pollen surveys to expose microscope slides coated with a suitable adhesive and examine them for the pollen grains caught. The counts of the various species are tabulated each day and at the end of the season drawn into a graph or pollen spectrum, as it is called , which gives a clear picture of the relative amounts of the different kinds of pollen which are floating in the air from day to day throughout the growing season If done in the north temperate zone such a spectrum will show the pollen of the early flowering trees, at first a trickle, as the junipers, alders and hazels flower, then a deluge as the birches, oaks and pines ami many other trees cast their pollen to the air. This is generally followed by a long stream of grass pollen, fluctuating from week to week as the various species come into flower, reach their zenith, then die out giving way to succeeding species And toward the end of the summer pollens of the late flowering weeds make their appearance, nowadays in most places com pletely dominated by that of the ragweed. If the record is repeated the following year the spectrum will be nearly the same The succession can be counted on to repeat itself with hltle change from year to year for many years to come, unless some cataclysm changes the surrounding vegetation which contributes to the pollen spectrum, for it is always a faithful representation of the surrounding vegetation...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Get Book
Book Description
Author: S N Agashe
Publisher: CRC Press
ISBN: 1439843376
Category : Science
Languages : en
Pages : 412
Get Book
Book Description
Palynology finds applications in various fields. Some of them are taxonomy, plant evolution, plant breeding programmes, biotechnology, microbiology of water, soil and air, the pharmaceutical industry, cosmetic industry, energy food industry, forensic science, aerobiology, allergy, epidemiology, meteorology, fossil fuel exploration and biodiversity.
Author: Mauro Cresti
Publisher: Springer Science & Business Media
ISBN: 3642599699
Category : Science
Languages : en
Pages : 444
Get Book
Book Description
Biotechnological methods are opening new ways in plant breeding. They allow novel strategies for improving crop productivity and quality, especially in the agrofood sector. The molecular mechanisms underlying these biotechnological approaches are presented here. Topics included are: pollen development, pollen tube growth, macrosporogenesis and fertilization and the effects of pesticides on sexual plant reproduction. Fertilization in higher plants is a complex process consisting of two events, the fusion of the egg with one sperm cell resulting in the diploid zygote, and the fusion of embryosac nuclei with another sperm cell, leading to a triploid endosperm. This "double fertilization" is preceded by the pollination process and a long lasting interaction between the dipoid pistil and the haploid pollen tube (progamic phase). Fertilization of flowering plants results in the formation of seeds and fruits, our basic food supply.
Author: G. Erdtman
Publisher: BRILL
ISBN: 9004612157
Category : Science
Languages : en
Pages : 567
Get Book
Book Description
Author: Willem Punt
Publisher:
ISBN: 9780444418838
Category : Botany
Languages : en
Pages : 183
Get Book
Book Description
