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Positive in Biological Definition

Gel electrophoresis

... operates as an electrolytic cell; the anode is positive and the cathode is negative). In the case of ... the direction of migration, from negative to positive electrodes, is due to the natural negative charge ... rates, or at all, when placing a negative to positive EMF on the sample. Proteins therefore, are ...

Gel electrophoresis

... operates as an electrolytic cell; the anode is positive and the cathode is negative). In the case of ... the direction of migration, from negative to positive electrodes, is due to the natural negative charge ... rates, or at all, when placing a negative to positive EMF on the sample. Proteins therefore, are ...

Blood type

... system is very important, as mismatching (an Rh positive donor to an Rh negative recipient) will cause ... an Rh negative mother who has already had an Rh positive child (or an accidental Rh+ blood transfusion) carries another Rh positive child. After the first pregnancy, the mother ...

T cell

... at their surface, they are said to be double positive (CD4 + CD8 + ). Double positive cells move deeper in the cortex, where they get ... engulfed by macrophages. This process is called positive selection . All their life T cells recognize ...

Amine

... available which can accept a H + ion to bond to the nitrogen forming a positive substituted ammonium ion. The pairs of dots on the N atoms in the ... If the reacting amine is a tertiary amine in such a reaction, then a positive quaternary ammonium cation will be formed along with a negative halide ...

Arabidopsis

... processes. Study of this organism has led to discoveries such as positive phototropic responses of root cells to red, far red and infrared light. ... have shown both negative phototropic response to blue or white light, and positive phototropic response to red light. The photosensitive pigments phytochrome ...

Ebola

... air, but did not cause any human fatalities; although four men did test positive for the virus, none became ill. Further outbreaks have occurred in ... in the factory were tested for Ebola, none of the tests came back testing positive (Draper 30-31). The natural reservoir for Ebola is still unknown today ...

Hepatitis B

... transmission is most common. Without intervention, a mother who is positive for the Hepatitis B surface antigen confers a 20% risk of passing the ... at the time of birth. This risk is as high as 90% if the mother is also positive for the Hepatitis B e antigen. Roughly 16-40% of unimmunized sexual ...

Homeostasis

... signalled to increase their activity and expel more carbon dioxide. In positive feedback , the response is to amplify the change in the variable. This has a de-stabilizing effect, so does not result in homeostasis. positive feedback is less common in naturally occurring systems than negative ...

Human

... in human race ), but human and especially humane may also emphasize positive aspects of human nature , and can be synonymous with benevolent (versus ... experienced as a bodily urge, often accompanied by strong emotions, both positive (such as love or ecstasy ) and negative (such as jealousy ). (See also ...

Prion

... action of a prion protein on a normal protein, but rather results from a positive feedback loop during the biosynthesis of PrP. In this view, the presence ... that, in some proteins, the ability to adopt a prion form may result from positive evolutionary selection. As of 2003 , the following proteins in ...

Alpha helix

... is too high. Some amino acids (called helix breakers ) like proline will disrupt the helical structure. Ordinarily, a helix has a buildup of positive charge at the N-terminal end and negative charge at the C-terminal end which is a destabilizing influence. As a result, α helices are often ...

Ames test

... grown in an agar containing dish so that a "lawn" of bacteria is present. The experimental cultures are exposed to the agent to be tested while the positive control cultures are exposed to a known mutagen to confirm that there has been no contamination of the strain. Strains of bacteria are available ...

Apoptosis

... picture: the actual process in which B and T cells are driven to proliferation, differentiation or apoptosis comprises a complex interplay between positive and negative regulators Apoptotic process Morphology A cell undergoing apoptosis shows a characteristic morphology that can be seen ...

Avian influenza

... the mother became ill and perished as well. In March, 2005 it was revealed that two nurses who had cared for avian flu patients have tested positive for the disease. Prevention and treatment Avian influenza in humans can be detected with standard influenza tests. However, these tests have ...

Depolarization

... In biology, depolarization refers to the event a cell undergoes when its membrane potential grows more positive with respect to the extracellular solution. Depolarization typically results from the influx of positively charged ions (such as sodium or ...

Down syndrome

... progress whatever the starting point. The commitment of parents, teachers and therapists to individual children has produced previously unexpected positive results. Medical research Of the inborn disorders that affect intellectual capacity, Down syndrome is the most prevalent and best studied. ...

Evolution

... operates on mutations in several different ways: Purifying or background selection eliminates deleterious mutations from a population. positive selection increases the frequency of a beneficial mutation. Balancing selection maintains variation within a population through a number of ...

Ewens's sampling formula

... probability that there are a 1 alleles represented once in the sample, and a 2 alleles represented twice, and so on, is for some positive number θ , whenever a 1 , ... a n is a sequence of nonnegative integers such that The phrase "under certain conditions", used ...

Flaviviridae

... include classical swine fever or hog cholera) The genome of the Flaviviridae viruses is a monopartite, linear, single-stranded RNA of positive sense that is 10,000-11,000 nucleotides long. The 5'-terminus carries a methylated nucleotide cap or a genome-linked protein. The virus itself ...

Life

... bound, carbon metabolic, nucleic acid replicated, protein readout system "a system of inferior negative feedbacks subordinated to a superior positive feedback " ( J. theor Biol. 2001 ) Tom Kinch's definition of life as a highly organized auto-cannibalizing system naturally emerging from ...

Polymerase chain reaction

... and then applying an electric current to the gel. As a result, the smaller DNA strands move faster than the larger strands through the gel toward the positive current. The size of the PCR product can be determined by comparing it with a DNA ladder , which contains DNA fragments of known size, also within ...

Peptide bond

... of PNA is also held together by peptide bonds. The C-N bond has a partial double bond character (with the Nitrogen atom attaining a partial positive charge and the oxygen atom a partial negative charge) and the molecule can normally not rotate around this bond. The whole arrangement of the four ...

Phloem

... movement of water and minerals through the xylem is driven by negative pressures (tension) most of the time, movement through the phloem is driven by positive hydrostatic pressures . This process is termed translocation , and is accomplished by a process called phloem loading and unloading . Cells in a ...

Potential energy

... affect the physics. If we redefine the potential at A to be a + c and the potential at B to be b + c [where c can be any number, positive or negative, but it must be the same number for all points] then the work done going from as before. In practical terms, this means that ...

Virus

... size, structure and, anatomy Virus particles comprise a nucleic acid genome , that may be either DNA or RNA , single or double stranded and positive or negative sense. This is surrounded (encapsidated) by a protective coat of protein called the capsid . The viral capsid may be either ...
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