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Wednesday, July 22, 2020 | History

4 edition of Studies on the germ cell of aphids. found in the catalog.

Studies on the germ cell of aphids.

Nettie Maria Stevens

Studies on the germ cell of aphids.

by Nettie Maria Stevens

  • 64 Want to read
  • 28 Currently reading

Published in Washington .
Written in English

    Subjects:
  • Aphids -- Embryology,
  • Germ cells

  • Classifications
    LC ClassificationsQL958 .S84
    The Physical Object
    Pagination28 p.
    Number of Pages28
    ID Numbers
    Open LibraryOL6971401M
    LC Control Number06022856
    OCLC/WorldCa14790585

    Childhood extracranial germ cell tumors form from germ cells in parts of the body other than the brain. A germ cell is a type of cell that forms as a fetus (unborn baby) develops. These cells later become sperm in the testicles or eggs in the ovaries.. This summary is about germ cell tumors that form in parts of the body that are extracranial (outside the brain).   However, detailed studies in D. melanogaster and more descriptive analyses of other insects suggest germ cell specification is likely mediated by preformation in the orders Diptera, Lepidoptera, and Hymenoptera (29, 48). If so, germ cells were likely specified by preformation in the Hymenoptera before the evolution of polyembryony itself.

    A germ cell is any biological cell that gives rise to the gametes of an organism that reproduces many animals, the germ cells originate in the primitive streak and migrate via the gut of an embryo to the developing , they undergo meiosis, followed by cellular differentiation into mature gametes, either eggs or animals, plants do not have germ cells. Sexual females then lay overwintering eggs that hatch in the spring. Thus, aphids with the same genomes can produce drastically different reproductive forms. The major differences between asexual and sexual aphids are the structure of the ovaries and the fate of germ cells. Aphid ovaries consist of six to eight ovarioles.

    Some studies have found that size and histology were the major factors determining prognosis for patients with malignant mixed germ cell tumors of the ovary.[6,8] Prognosis was poor for patients with large tumors when more than one-third of the tumor was composed of endodermal sinus elements, choriocarcinoma, or grade 3 immature teratoma. Charles Bonnet was a naturalist and philosopher in the mid eighteenth century. His most important contribution to embryology was the discovery of parthenogenesis in aphids, proving that asexual reproduction of offspring was possible. In his later life, he was an outspoken defender of the theory of generation now known as preformationism, according to which offspring exist prior to conception.


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Studies on the germ cell of aphids by Nettie Maria Stevens Download PDF EPUB FB2

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book: Additional Physical Format: Print version: Stevens, Nettie Maria, Studies on the germ cell of aphids. Washington, (DLC) (OCoLC) Material Type: Document, Internet resource: Document Type: Internet Resource, Computer File:.

Additional Physical Format: Online version: Stevens, Nettie Maria, Studies on the germ cell of aphids. Washington, (OCoLC) Free 2-day shipping on qualified orders over $ Buy Studies on the Germ Cell of Aphids () at nd: Nettie Maria Stevens. Studies on the germ cells of aphids, By.

Stevens, N. (Nettie Maria), Publication Details. Washington, D.C.:Carnegie Institution of Washington, If you are generating a PDF of a journal article or book chapter, please feel free to enter the title and author information.

The information you enter here will be stored in the. Studies on germ cells.: I. The history of the germ cells in insects with special reference to the keimbahn-determinants. Author Hegner, Robert William,   Studies on the Germ Cell of Aphids () by Nettie Maria Stevens,available at Book Depository with free delivery worldwide.

Buy Studies on the Germ Cells of Aphids by Nettie Maria Stevens from Waterstones today. Click and Collect from your local Waterstones or get FREE UK delivery on orders over £ Studies on the germ cells of aphids, By N. (Nettie Maria) Stevens Topics: Alphididae, Embryology, Insects.

While much attention has been given to the study of different genetic and chemical methods for the generation of iPS (induced pluripotent stem) cell lines, relatively little is known about the. Human germline engineering is the process by which the genome of an individual is edited in such a way that the change is heritable.

This is achieved through genetic alterations within the germ cells, or the reproductive cells, such as the egg and germline engineering is a type of genetic modification that directly manipulates the genome using molecular engineering techniques.

In our previous immunostaining experiments the cross-reacting antibody against Drosophila Nanos only marked aphid germ cells until the blastoderm is formed, but after that germ cells become devoid.

This book is printed in black & white, sewing binding for longer life, Printed on high quality Paper, re-sized as per Current standards, professionally processed without changing its contents. Studies on the Germ Cells of Aphids (Hardback) N M Stevens.

Publicado por Wentworth Press, United States () ISBN ISBN Studies in Spermatogenesis is a two volume book written by Nettie Maria Stevens, and published by the Carnegie Institution of Washington in and In the books Stevens explains the research she conducted on chromosomal sex determination in the sperm and egg cells of insect species while at Bryn Mawr College, near Philadelphia, Pennsylvania.

About this Book Catalog Record Details. Studies on the germ cell of aphids. Stevens, Nettie Maria, View full catalog record. Rights: Public Domain, Google-digitized. Aphids David L. Stern What is an aphid. Aphids are small, soft-bodied insects that feed by inserting their slender mouthparts into phloem cells, the food conduits of plants.

Most aphid species feed on only one species of plant and closely related aphid species tend to feed on closely related species of plants.

Once an aphid finds the correct plant. Germ cells are the embryonic precursors of the gametes. They are set aside from the somatic cell lineages early in the development of most species. In the mouse. the germ cells, once they have formed, migrate through the tissues of the embryo to the gonad primordia (genital ridges), where they coassemble with somatic gonadal cells to form the sex cords.

Pathophysiology. While the etiology of primary CNS GCT is unclear, and there are several hypotheses that attempt to explain this disease process cells are believed to be pluripotent and able to differentiate into any type of cell These cells originate in the yolk sac of the embryo around the third to fourth week of gestation, normally destined for the ovaries or testes but can.

Germ cells are cells that create reproductive cells called gametes. Most cells in your body are somatic cells. They include skin cells, bone cells, red blood cells, and many more.

Germ cell tumors that occur in places other than the testicles and ovaries (extragonadal germ cell tumors) are very rare. Germ cell tumors tend to respond to treatment and many can be cured, even when diagnosed at a late stage.If technically feasible, patients with late relapse and negative tumour markers should undergo immediate radical surgery to completely resect all mature teratoma or secondary non-germ cell cancer.

Due to the poor results of chemotherapy in patients with late relapses, patients with small and completely resectable lesions should undergo surgery.Certain studies have analysed the pea aphid transcriptome in different tissues and physiological conditions [38, but no global gene expression analysis of the aphids.