• 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
The medicinal leech as a model organism for establishing the
The medicinal leech as a model organism for establishing the

... How is sensory information processed? It was shown in [6] that a skin stimulation activates a large number of cells. Among others, the pressure sensitive P-Cell and a cell of unknown function, the AP-Cell, were active. ...
“Virtual Cell” Activity
“Virtual Cell” Activity

... “Virtual Cell” Activity Go to www.virtualcell.com, then CLICK on “The Virtual Textbook”, then CLICK on “Cell Biology” to begin. The virtual cell will allow you to get a close-up view of several organelles in 3-D! You will be able to choose certain organelles within the cell and manipulate them by zo ...
Multiple Expression of Ly-6C and Accumulation of a Ly-6C Pre-mRNA... Activated Macrophages Involved in Rejection of an Allografted Tumor
Multiple Expression of Ly-6C and Accumulation of a Ly-6C Pre-mRNA... Activated Macrophages Involved in Rejection of an Allografted Tumor

... by immunoblot data obtained with antiserum against Ly-6C (Fig. 3). Furthermore, when the expression of Ly-6C on these cells was examined by FCM using an AL-21 mAb specific for Ly-6C (24), more than 90% of the AIMs (Fig. 1F) or BCG-elicited Møs (Fig. 1G) and about 50% of the bone marrow cells (Fig. 1 ...
Epithelial and Connective Tissues
Epithelial and Connective Tissues

... collagen network) that supports epithelium-really associated connective tissue • Connective tissue support • Nutrients from capillaries in underlying connective tissue • Nerves pass through • Easily regenerates • E.g. skin, lining of gut, mucous membranes Human Anatomy, Larry M. Frolich, Ph.D. ...
title: green synthesis of silver nanoparticles and its cancer cells
title: green synthesis of silver nanoparticles and its cancer cells

... cancer cell lines. The synthesis of nanoparticles was confirmed by UV- Visible ...
The Sonic Hedgehog
The Sonic Hedgehog

... •Basal Cell Carcinoma is the most common skin cancer, and possibly the most common cancer of all ...
Protista
Protista

... Structure of Amoeba Contractile Vacuole: maintains salt and water balance within cell (Osmoregulation): - collects water entering cell by osmosis. - swells, touches cell membrane. ...
The basic structural and functional unit of an organism
The basic structural and functional unit of an organism

... Chromosomes are condensed form of the fine thread like structure called chromatin material (thread) which are seen only cell undergoing cell division. The chromatin thread are made up of DNA which organize into gene. Chromosomes are called hereditary vehicle This is because they contain gene which ...
Hormones in action
Hormones in action

...  Agonists act like the "normal" hormone, although perhaps more or less potently. Natural hormones are themselves agonists and, in many cases, more than one distinct hormone binds to the same receptor. For a given receptor, different agonists can have dramatically different potencies.  Antagonists ...
Summary for the non-biologist Developmental biology
Summary for the non-biologist Developmental biology

... same time that they relay the signal (or pass on the message). This is how multicellular development is triggered and its dependence on extracellular cAMP is a unique feature of Dictyostelium development. The proteins or enzymes that produce cAMP are called adenylyl cyclases and we find three in Dic ...
Cell City
Cell City

... Name ____________________________________________________________ Period ______ ...
osmosis - School
osmosis - School

... The contents of the cell cytoplasm are a complex mixture of dissolved solutes, giving a certain water potential. If the cell is placed in a solution of equal concentration then as much water will diffuse in as out and the two solutions are ...
Cel l and Tissue Injury
Cel l and Tissue Injury

... • Pathology is "Scientific study of disease“ Study of structural and functional changes in disease. • Diseases is an expression of "discomfort" due to structural or functional abnormality. • "Pathology deals with knowledge of what causes disease, how disease starts, progresses & it explains the rea ...
chapter3_Cells - Moore Middle School
chapter3_Cells - Moore Middle School

... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
Midterm_Review
Midterm_Review

... vacuole, centriole, chloroplast, chromatin, chromosome, cilia, crista, (plural, cristae), cytoplasm, cytoskeleton, electron microscope (EM), endomembrane system, endoplasmic reticulum (ER),, endosymbiosis, eukaryotic cell, extracellular ...
Chapter 3
Chapter 3

... • A group of organs working together to perform a particular function is called an organ system. Each organ system has a specific job in the body. • Examples of organ systems are the digestive system, the respiratory system, and the cardiovascular system. • Examples of plant organ systems are leaf s ...
Chapter 3 - Cobb Learning
Chapter 3 - Cobb Learning

... • As a cell’s volume increases, its surface area grows. But volume increases faster than the surface area. • The area of a cell’s surface–compared with the cell’s volume–limits the cell’s size. • The ratio of the cell’s outer surface to the cell’s volume is called the surface area-to-volume ratio: ...
Chapter 5
Chapter 5

... Endocytosis and Exocytosis • Endocytosis  Brings macromolecules, large particles, small molecules, and even other cells into the eukaryotic cell. • Exocytosis  Process by which materials packaged in vesicles are secreted from the cell. ...
Maintaining a Dynamic Equilibrium The Need for Homeostasis
Maintaining a Dynamic Equilibrium The Need for Homeostasis

... as its external environment changes. This ability of all living things to detect deviations and to maintain a constant internal environment is known as homeostasis. An obvious change that has occurred in the course of evolution is the development of larger multicellular organisms from microscopic, s ...
Cells
Cells

...  Hypertonic to the cell – Concentration of solute is greater outside cell → water moves in until equilibrium is reached. Cell may shrivel.  Hypotonic to the cell – Concentration of solute is lower outside cell → water moves into cell until equilibrium is reached. Cell may swell to bursting point. ...
Introduction to Cell Biology
Introduction to Cell Biology

... unit of all living organisms, conserving the features of the organism, having the ability of self-control, self-regulation, and ...
4150 Lecture 8
4150 Lecture 8

... What happens when telomeres get too short? • Cell detects short telomere ends and become senescent or undergo apoptosis • Biological clock for regulating the number of cell divisions for a cell • Genes located near telomeres may be regulated by length – age-regulated gene expression ...
GENETICS
GENETICS

... The history of chemotherapy starts with Paul Ehrlich • Development of salvarsan to treat syphilis ...
Polycationic Polypeptides: a Possible Model for the
Polycationic Polypeptides: a Possible Model for the

... phosphate-buffered saline pH 7.2 (PBS) (Dulbecco & Vogt, 1954)at room temperature, and collected by low-speed centrifugation at 1OOOg. JM cells were kindly provided by Dr H. W. Kreth, Institut fur Virologie, Universitat Wiirzburg. The JM cell line is a human lymphoblastoid cell line with T cell char ...
Undergraduate student projects in the Department of Molecular
Undergraduate student projects in the Department of Molecular

... Irx3 and Irx5 target genes in adipocyte differentiation Our laboratory has recently identified Irx3 and Irx5 as major regulators of energy homeostasis in both the hypothalamus and adipose tissue. Knockout of Irx3 or Irx5 leads to profound defects in adipocyte differentiation. This summer project wil ...
< 1 ... 578 579 580 581 582 583 584 585 586 ... 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