acrosomal reaction definition
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Acrosome Reaction Definition - What does Acrosome Reaction mean? The acrosomal reaction is the process of two sex gametes, known as the egg cell and the sperm cell, fusing together, causing fertilization. Acrosomal reactions are an essential step of conception, and any abnormality can prevent fertilization and cause infertility.
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- Iodine clock reaction. Iodine clock reaction (persulfate variation) The iodine clock reaction (also known as the Harcourt-Esson reaction or the Harcourt-Essen reaction) is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886.
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Acromegaly Acromegaly. Acromegaly is a condition caused by a benign tumor on the pituitary gland that results in the body's excessive production of growth hormone. Growth hormone is essential during puberty and is responsible for growth spurts. But after puberty, growth hormone production ordinarily drops to very low levels.n acromegaly, elevated growth hormone causes an abnormal increase in shoe and ring size, enlargement of the lower jaw bone and separation of teeth, and enlargement of the nose.
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- acrosome. the caplike, membrane-bounded structure that covers the anterior portion of the head of the mammalian spermatozoon; it is bounded by an inner and an outer membrane and contains enzymes involved in penetration of the ovum. acrosome reaction.fusion of the outer acrosomal membrane with the sperm plasma membrane, and the breakdown of the fused complex, after the attachment of the spermatozoon to the zona pellucida. It is induced by substances from the egg investments and releases enzymes involved in penetration of the ovum.1  Facebook.crosome reaction. fusion of the outer acrosomal membrane with the sperm plasma membrane, and the breakdown of the fused complex, after the attachment of the spermatozoon to the zona pellucida.
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Practice Essentials Dystonic reactions are reversible extrapyramidal effects that can occur after administration of a neuroleptic drug. Symptoms may begin immediately or can be delayed hours to days. Although a wide variety of medications can elicit symptoms, the typical antipsychotics are most often responsible.
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Acrosome In Eutherian mammals the acrosome contains digestive enzymes (including hyaluronidase and acrosin). These enzymes break down the outer membrane of the ovum, called the zona pellucida, allowing the haploid nucleus in the sperm cell to join with the haploid nucleus in the ovum.his can be done to serve as a positive control when assessing the acrosome reaction of a sperm sample by flow cytometry or fluorescence microscopy. This is usually done after staining with a fluoresceinated lectin such as FITC-PNA, FITC-PSA, FITC-ConA, or fluoresceinated antibody such as FITC-CD46.
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- Transition to invasive carcinoma (with immunohistochemical profile similar to microglandular adenosis) from atypical microglandular adenosis has been documented although some cases may represent juxtaposition of 2 unrelated pathologies (Arch Pathol Lab Med 2007;131:1397)
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What is orbital hypertelorism An isolated osteotomy is the type of procedure most commonly used in this situation. An isolated osteotomy involves cutting and repositioning of the eye sockets. Some children with orbital hypertelorism also have a midface that is shortened and cleft.
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Maillard reaction A non-enzymatic heat-activated chemical reaction between sugars (especially ribose) and amino acids, which occurs in foods as they form glycosylamines and Amadori compounds.
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Gigantism and Acromegaly Gigantism and acromegaly are syndromes of excessive secretion of growth hormone (hypersomatotropism) that are nearly always due to a pituitary adenoma. Before closure of the epiphyses, the result is gigantism. Later, the result is acromegaly, which causes distinctive facial and other features. Diagnosis is clinical and by skull and hand x-rays and measurement of growth hormone levels. Treatment involves removal or destruction of the responsible adenoma.
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Organic Chemistry- Alkenes and Alkynes a reaction involving an increase in the number of groups attached to the alkene and a decrease in the number of elements of unsaturation. anti-addition. an addition in which two groups add to opposite faces of the double bond (Br2) electrophilic addition.
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Reproductive System acrosome reaction. When a sperm comes in contact with the protein coats surrounding the egg, the acrosome (an enzyme-filled vacuole at the tip of the sperm cell) bursts open and releases enzymes that digest the jelly-like coating of the egg.   .
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Antistreptolysin O Titer Related Topics. Antistreptolysin O (ASO) titer is a blood test to measure antibodies against streptolysin O, a substance produced by group A Streptococcus bacteria. Antibodies are proteins our bodies produce when they detect harmful substances, such as bacteria. Reference from A.D.A.M.
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Oncogenic transformation The abnormal FIG-ROS fusion protein has constitutively active kinase activity that causes oncogenic transformation (a transformation from normal cells to cancer cells). Chromosomal inversion s: reversing the orientation of a chromosomal segment.
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Endergonic reaction In chemical thermodynamics, an endergonic reaction (also called a nonspontaneous reaction or an unfavorable reaction) is a chemical reaction in which the standard change in free energy is positive, and energy is absorbed.
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Acromioclavicular (AC) Joint Instability, Subluxation & Dislocation An AC Joint Subluxation is a partial dislocation, meaning that the clavicle goes partially out of joint, with part of the clavicle still touching the acromion. An AC Joint Subluxation looks like a small bump on top of the shoulder.
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- The Arthus reaction is a type of local type III hypersensitivity reaction which involves the deposition of antigen/antibody complexes mainly in the vascular walls, serosa (pleura, pericardium, synovium) and glomeruli. An immune complex is formed from the integral binding of an antibody to a soluble antigen.
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AC Joint Arthosis AC Joint Arthosis. The acromioclavicular or AC joint is the site where the shoulder girdle, which includes the arm and the shoulder blade, attaches to the axial skeleton through the clavicle. This acromioclavicular joint is a common place of injury and can be a common source of shoulder pain.
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Acrosome reaction It also alters a patch of pre-existing sperm plasma membrane so that it can fuse with the egg plasma membrane. A sperm penetration assay includes an acrosome reaction test that assesses how well a sperm is able to perform during the fertilization process.art of the sperm's cell membrane then fuses with the egg cell's membrane, and the contents of the head sink into the egg. In the mouse it has been demonstrated that ZP3, one of the proteins that make up the zona pellucida, binds to a partner molecule (to the β1,4-galactosyl transferase receptors) on the sperm.
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Acrosome reaction Acrosome reaction on a Sea Urchin cell. During fertilization, a sperm must first fuse with the plasma membrane and then penetrate the female egg in order to fertilize it. Fusing to the egg usually causes little problem, whereas penetrating through the egg's hard shell can present more of a problem to the sperm.he membrane at the tip of the acrosomal process fuses with the egg's plasma membrane. In some echinoderms, including starfish and sea urchins, a major portion of the exposed acrosomal content contains a protein that temporarily holds the sperm on the egg's surface.
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LEUKOSCAN FOR THE DIAGNOSIS OF PROSTHESIS INFECTION AFTER TOTAL JOINT ARTHROPLASTY Abstract. Antigranulocyte scintigraphy with the use of monoclonal antibodies or antibody fragments (leukoscan) is a promising diagnostic tool that has been used widely during the recent years for the establishment of prosthesis infection after total hip or knee arthroplasty.ntigranulocyte scintigraphy with the use of monoclonal antibody fragment sulesomab (leukoscan) had good but not perfect diagnostic performance for the diagnosis of prosthesis infection in patients with total hip or knee arthroplasty.
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Hypersensitivity reactions associated with endovascular devices Hypersensitivity to orthopaedic, dental, endovascular and other implanted devices has been reported in case and group studies. However, allergic reactions to endoprostheses are still unpredictable processes that are not fully understood.
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- Mechanism of action. Crisaborole is the product of a focused medicinal chemistry effort to create small molecules that inhibit TNF-alpha, the inflammatory cytokine that is the target of the powerful monoclonal antibodies now marketed for the treatment of psoriasis.
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Cerebral achromatopsia Main article: Agnosia. Cerebral achromatopsia is a type of color-blindness caused by damage to the cerebral cortex of the brain, rather than abnormalities in the cells of the eye's retina. It is often confused with congenital achromatopsia but underlying physiological deficits of the disorders are completely distinct. 1 History.
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- Acylation reaction involves substitution by an electron donor (nucleophile) at the electrophilic carbonyl group (C=O). Common nucleophiles in the acylation reaction are aliphatic and aromatic alcohols, both of which give rise to esters and amines (RNH 2) which give amides.n substitutive chemical nomenclature, their names are formed by adding '-oyl' as a suffix to the name of the parent compound; ethanoyl chloride, CH 3 COCl, is an example. The terms acyl and aroyl halides refer to aliphatic or aromatic derivatives, respectively.
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- 2° Immune Response. 1  If a second dose of the same antigen is given days or even years later, an accelerated 2° or anamnestic immune response (IR) occurs. 2  The amount of antibody produced rises to a high level. 3  Antibody level tends to remain high for longer.