Temperature-Sensitive Mutation in [em]PARAMECIUM AURELIA[/em]. I. Induction and Inheritance PDF Download
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Languages : en
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A new class of mutation was induced by X-radiation in Paramecium aurelia . These mutant segregants were called temperature-sensitive mutants ( ts mutants) since they can grow normally at 27° but are inviable at 36°. The maximum yield of ts mutant segregants after 2 kR of X-radiation was about 14% of the segregants viable at 27°. Crosses between persistent ts mutant segregants and wild-type stocks showed that the ts character is inheritable and recessive. Crosses between different ts mutant stocks revealed that these ts loci are widely spread over the genome of Paramecium. Certain subsidiary problems arising in the course of the work and the genetic applications of the ts mutations to genetic analysis of paramecia were discussed.
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A new class of mutation was induced by X-radiation in Paramecium aurelia . These mutant segregants were called temperature-sensitive mutants ( ts mutants) since they can grow normally at 27° but are inviable at 36°. The maximum yield of ts mutant segregants after 2 kR of X-radiation was about 14% of the segregants viable at 27°. Crosses between persistent ts mutant segregants and wild-type stocks showed that the ts character is inheritable and recessive. Crosses between different ts mutant stocks revealed that these ts loci are widely spread over the genome of Paramecium. Certain subsidiary problems arising in the course of the work and the genetic applications of the ts mutations to genetic analysis of paramecia were discussed.
Author: William R. Catton
Publisher: University of Illinois Press
ISBN: 0252098005
Category : Social Science
Languages : en
Pages : 321
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Book Description
Our day-to-day experiences over the past decade have taught us that there must be limits to our tremendous appetite for energy, natural resources, and consumer goods. Even utility and oil companies now promote conservation in the face of demands for dwindling energy reserves. And for years some biologists have warned us of the direct correlation between scarcity and population growth. These scientists see an appalling future riding the tidal wave of a worldwide growth of population and technology. A calm but unflinching realist, Catton suggests that we cannot stop this wave - for we have already overshot the Earth's capacity to support so huge a load. He contradicts those scientists, engineers, and technocrats who continue to write optimistically about energy alternatives. Catton asserts that the technological panaceas proposed by those who would harvest from the seas, harness the winds, and farm the deserts are ignoring the fundamental premise that "the principals of ecology apply to all living things." These principles tell us that, within a finite system, economic expansion is not irreversible and population growth cannot continue indefinitely. If we disregard these facts, our sagging American Dream will soon shatter completely.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
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Author: Dennis S. Hill
Publisher: Springer Science & Business Media
ISBN: 1402067380
Category : Science
Languages : en
Pages : 708
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Book Description
This is a textbook providing basic data about the crop pests and the damage they inflict throughout the tropics and sub-tropics. Each major pest is illustrated by either a line drawing or a photograph, and sometimes the damage can also be seen. A world distribution map is provided for each species. Control measures tend to be general rather than very specific. Most of the pests are insects and mites, but some nematodes, molluscs, birds and mammals are included.
Author: Daniel Israel Arnon
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 596
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Author: Shree Ram Singh
Publisher: Humana
ISBN: 9781493945672
Category : Medical
Languages : en
Pages : 0
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Book Description
Mouse Genetics: Methods and Protocols provide selected mouse genetic techniques and their application in modeling varieties of human diseases. The chapters are mainly focused on the generation of different transgenic mice to accomplish the manipulation of genes of interest, tracing cell lineages and modeling human diseases. Composed in the highly successful Methods in Molecular Biology series format, each chapter contains a brief introduction, a list of necessary materials, systematic, readily reproducible methods and a notes section, which shares tips on troubleshooting in order to avoid known pitfalls. Comprehensive and authoritative, Mouse Genetics: Methods and Protocols promises to deliver fundamental techniques and protocols to geneticists, molecular biologists, cell and developmental biologists, students and postdoctoral fellows working in the various disciplines of mouse biology and modeling human disease.
Author: Bernice Pauahi Bishop Museum
Publisher:
ISBN:
Category : Insects
Languages : en
Pages : 356
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Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 914
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Book Description
"Zoological Record is published annually in separate sections. The first of these is Comprehensive Zoology, followed by sections recording a year's literature relating to a Phylum or Class of the Animal Kingdom. The final section contains the new genera and subgenera indexed in the volume." Each section of a volume lists the sections of that volume.
Author: Environmental Monitoring and Support Laboratory (Las Vegas, Nev.)
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 28
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Author: John G. Scandalios
Publisher: Academic Press
ISBN: 148327022X
Category : Science
Languages : en
Pages : 293
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Book Description
Physiological Genetics is a compilation of developments, contributed by experts in the field of physiological genetics. The articles contained in the book covers various accounts of developments in the field. The book starts with an introductory chapter describing genetic factors in developmental gene regulation, followed by discussions on enzyme differentiation, hormonal control of gene expression, biochemical genetics of morphogenesis, cytoplasmic male sterility in maize, plant somatic cell genetics, and the population dynamics of genetic polymorphism. Physiologists, biologists, geneticists, and students will find a valuable reference material.
