• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
What`s New in the Plant Cell Cycle?
What`s New in the Plant Cell Cycle?

... cultured, and from which an entire plant could be regenerated (Feldman and Torey 1975). These observations were consistent with the idea that cells of the quiescent centre are pluripotent. However, and at the time somewhat surprisingly, when all cells of the QC were laser ablated, subtending cells o ...
Primordial germ cell migration - The International Journal of
Primordial germ cell migration - The International Journal of

... this interaction may be required for PGC motility as well as survival in this environment. Between E9.0-E9.5, PGCs exit from the dorsal aspect of the gut, split into two streams and migrate towards the positions of the developing genital ridges. It was proposed that PGC migration was not directional ...
Role of Membrane Potential in the Regulation of Cell Proliferation
Role of Membrane Potential in the Regulation of Cell Proliferation

Metabolic communication from cardiac myocytes to vascular
Metabolic communication from cardiac myocytes to vascular

... specific cells, thereby conferring local specialization of function. Specialization of function is shown by the varied control mechanisms that appear to modulate vasomotor tone at different locations in the coronary vasculature. This precise regulation of vascular tone is critical because the heart ...
Isolation of Chinese Hamster Ovary Cell Mutants Requiring the
Isolation of Chinese Hamster Ovary Cell Mutants Requiring the

Introduction to Biology - Phillips Scientific Methods
Introduction to Biology - Phillips Scientific Methods

... b. Cilia and flagella – are extensions of eukaryotic cells, and are composed of, and move by, microtubules. Cilia are numerous and short, and flagella occur one or two to a cell and are longer. 1) Cilia and flagella are composed of a core of nine pairs of microtubules arranged in a ring around two s ...
CHAPTER 11 CELL COMMUNICATION
CHAPTER 11 CELL COMMUNICATION

FREE Sample Here
FREE Sample Here

... Full file at http://emailtestbank.com/ Test-Bank-for-Essentials-of-Genetics-8th-Edition--by-Klug ...
a Gene Encoding a Putative Signal Transduction Receptor in
a Gene Encoding a Putative Signal Transduction Receptor in

... cells exchange pronuclei and fertilization occurs when the migratory nucleus from the mating partner fuses with the stationary pronucleus. The zygotic nuclei undergo two postzygotic mitoses to produce four nuclei in each cell, two of which develop into new macronuclei (macronuclear anlagen) and two ...
CT1
CT1

... 2. The cell membrane lets only certain substances in and out; it is said to be _________________________. 3. If a sodium ion (Na+) is being transported across the cell membrane into an area of higher concentration, the SPECIFIC transport process being used is _____________________. 4. When a cell is ...
Day1 chick development
Day1 chick development

... Fig. 1. Phylogenetic and ontogenetic relationships between the mammals and birds. A: Amniote phylogeny. The Synapsida (mammalian) group contains the monotremes, marsupials, and eutherians. The sauropsida (reptilian and avian) group contains the birds, crocodiles (omitted), turtles, lizards, snakes ( ...
File
File

... Oxidation and reduction are paired chemical reactions in which electrons are transferred from one substance to another in a predictable way. The control and applications of oxidation and reduction reactions have significant implications for industry, health and safety, and the environment. ...
File
File

... Result: Water moves equally in both directions and the cell remains same size! (Dynamic Equilibrium) ...
Canonical Cortical Circuits
Canonical Cortical Circuits

... is proportional to the pooled activity of a large number of cortical cells and acts to divide the firing rate of each cell in the pool. Quite how this might be implemented mechanistically is not at all clear, but such normalization models do at least offer one means of correcting the deficiencies of t ...
Transpiration
Transpiration

... – Locally (cell to cell) ...
High throughput quantitative reverse transcription PCR assays
High throughput quantitative reverse transcription PCR assays

regulation of cell growth by vitreous humour
regulation of cell growth by vitreous humour

... Cartilage, which is vascularized during embryogenesis, becomes avascular as development continues (Haraldsson, 1962). Neonatal rabbit cartilage was found to inhibit tumour or tumour extract-induced neovascularization occurring in the rabbit cornea or in the chicken chorioallantoic membrane (CAM) (Br ...
Calcium Imaging and Electron Microscopy by Response to Antigen
Calcium Imaging and Electron Microscopy by Response to Antigen

... Recent data suggest that Itk, through its interaction with the scaffolding membrane protein LAT and the adaptor protein SLP-76, is involved in an amplification step that is necessary for a full activation of PLC-␥ and, therefore, of the Ca2⫹ response (11–13). Most of these conclusions have been draw ...
3.4 Diffusion and Osmosis
3.4 Diffusion and Osmosis

... transport materials that cannot diffuse across a membrane. ...
Chloroplasts and mitochondria worksheet answers
Chloroplasts and mitochondria worksheet answers

... of coins within the walls of the chloroplast, and they act to trap the. Process usually occurring within chloroplasts whereby chlorophyll traps solar energy and carbon dioxide is reduced to a. Photosynthesis Review Worksheet. 7. Mitochondria do not take part in the conversion of light energy into ch ...
Subconjunctival hibernoma in a dog
Subconjunctival hibernoma in a dog

... cytoplasm, coarsely stippled chromatin ›  Rare mitotic figures; moderate pleomorphism ...
Adjustment of Host Cells for Accommodation of
Adjustment of Host Cells for Accommodation of

... zone (interzone 2/3 according to Vasse et al., 1990) (Figures 1A, 1B, 1D, and 1G); and (4) more mature infected cells of the fixation zone (Figures 1A, 1B, 1E, and 1H). For 3D reconstruction, Z-stacks covering whole cells were obtained for at least eight infected/noninfected cells at each selected de ...
Gene Section MIEN1 (migration and invasion enhancer 1) in Oncology and Haematology
Gene Section MIEN1 (migration and invasion enhancer 1) in Oncology and Haematology

... induction of cell motility and invasion (Dasgupta et al., 2011; Katz et al., 2010). High levels of MIEN1 expression lead to epithelial to mesenchymal transition in breast cell lines (Katz et al., 2011a). However, intermediate levels lead to a cancer phenomenon rarely observed in experimental models, ...
- Orangefield ISD
- Orangefield ISD

... • Formation of membranes was an important step in the evolution of life. • Researchers have investigated ways of enclosing molecules in membranes, but the connection between various chemical events and the overall path to cells is unresolved. ...
Cellular Senescence and the Biology of Aging, Disease, and Frailty
Cellular Senescence and the Biology of Aging, Disease, and Frailty

... cellular impairments that manifest as deterioration (e.g. as evidenced by the cardiovascular, metabolic, musculoskeletal, and the nervous system), hyperproliferation (i.e. as in the aberrant growth of malignant cells), and chronic, low grade, sterile inflammation (inflammaging). These phenotypes of ...
< 1 ... 370 371 372 373 374 375 376 377 378 ... 1231 >

Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report