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Value in Biological Definition

Biodiversity

... less recognized as such. . Estimation of the value of biodiversity is a necessary precondition to ... the distribution of biodiversity richnesses. This value can be divided into use value (direct such as tourism or indirect such as ...

Signal transduction

... [HR]=receptor-bound hormone The important value for the strength of the signal relayed by the ... of the circulating hormone is the key value for the strength of the signal, since the other ... processes and cell differentiation . The key value for the signal strength is the hormone ...

Hardy-Weinberg principle

... level for 1 degree of freedom is 3.84, and since the χ 2 value is less than this, the null hypothesis that the population is in ... from Hardy–Weinberg equilibrium: where the expected value from Hardy–Weinberg equilibrium is given by For example, ...

Michaelis-Menten kinetics

... of that, no [S] for V max can be given. Instead, the characteristic value for the enzyme is defined by the substrate concentration at its half-maximum speed ( V max /2 ). This K M value is also called Michaelis-Menten constant . Contents ...

Potential energy

... force is said to be conservative and it is possible to define a numerical value of potential associated with every point in space. A force field can be ... A graph of a 1D or 2D potential function with the function value scale increasing upward is useful to visualize the potential field: a ball ...

Biology

... of a population on the landscape, and the points A, B, and C are local optima. The red ball indicates a population that moves from a very low fitness value to the top of a peak Main articles: Evolutionary biology , Botany , Zoology Evolutionary biology is concerned with the origin and ...

Full blood count

... (MCV) - the average volume of the red cells, measured in femtolitres . Anemia is classified as microcytic or macrocytic based on whether this value is above or below the expected normal range. Other conditions that can affect MCV include thalassemia and reticulocytosis . Mean cell ...

Chi-square test

... association chi-square test All such tests involve a statistic of the form where the word "expected" often does not denote an expected value , but an observable estimate of an expected value. ...

Culture

... and emotional features of society or a social group and that it encompasses, in addition to art and literature, lifestyles, ways of living together, value systems, traditions and beliefs". [ UNESCO, 2002 ] While these two definitions are broad, they do not exhaust the many uses of this concept -- in ...

DNA

... the phosphate chains did not vary along a sequence. Watson and Crick were able to discern that this distance was constant and to measure its exact value of 2 nanometres from an X-ray pattern obtained by Franklin. The same pattern also gave them the 3.4 nanometre-per-10 bp " pitch " of the helix. The ...

Electrophysiology

... using feedback through an operational amplifier circuit. The control of the membrane potential using voltage-clamp is most obviously of value in the study of voltage-gated ion channels , but also aids in characterizing conductance . Current-clamp, on the other hand, is used to study cell ...

Fitness landscape

... of a population on the landscape, and the points A, B, and C are local optima. The red ball indicates a population that moves from a very low fitness value to the top of a peak. Illustration by C.O. Wilke, 2001. Further reading Sewall Wright . "The roles of mutation, inbreeding, ...

Genetic fingerprinting

... leave the DNA sample at the exact time of the crime? If yes, does that mean that the accused is guilty of the crime? Fake DNA evidence The value of DNA evidence has to be seen in light of recent cases where criminals planted fake DNA samples at crime scenes. In one notorious case, a criminal ...

Human

... a set of distinctive material, intellectual , emotional , and spiritual features of a social group, including art , literature , lifestyles , value systems , traditions , rituals , and beliefs . One common understanding of culture is to see it as consisting of three elements: values, social ...

Hydrolysis

... concentration of A, and W = [H 2 O] = 55.5 molar, then x can be calculated with the equation: let K d ×W = k then For a value of C = 0.001 molar, and k = 1 molar, x /C > 0.999. Less than 0.1% of the original reactant would be present once the reaction is complete. This ...

Insulin

... immune system, leaving thousands of islets. They then isolated the protein from these islets to produce what they called isletin . Macleod saw the value of the research on his return from Europe, but demanded a re-run to prove the method actually worked. Several weeks later it was clear the second run ...

Metapopulation

... patches, dN , is d N = (1 - N ) c N - e N . This takes on a sigmoid shape similar to the logistic model . The equilibrium value of N can be calculated by setting dN to be equal to zero. Solving for N gives either N = 0 or N = 1 - e / c This result, ...

Magnetic resonance imaging

... region within an organism or sample, but gives relatively little information about the chemical or physical nature of that region--its chief value is in being able to distinguish the properties of that region relative to those of surrounding regions. MR spectroscopy, however, provides a wealth ...

Nutrition

... Medicine and Trauma Institute of food additives and ingredients Burning Fat sound advices eLook Nutrition - Covers the nutritional value of common day food stuff Department of Agriculture's Food and Nutrition Information Center . Good Nutrition Habits. Are you getting enough ...

Paternity testing

... genome can only prove if two individuals are related by common descent through maternal lines only from a common ancestor and is thus of limited value (for instance, it could not be used to test for paternity). Obtaining news that a child either is or isn't one's own is someting that a parent or ...

Sociobiology

... male is displaced. Female infanticide and fetal resorption are active areas of study. In general, females with more bearing opportunities may value offspring less. Also, females may arrange bearing opportunities to maximize the food and protection from mates. Criminality is actively under ...

Vitamin

... 2.2 About names 3 Pseudo-vitamins 4 Non-human vitamins 5 See also 6 References 7 External links History The value of eating certain foods to maintain health was recognized long before vitamins were identified. The ancient Egyptians knew that feeding a patient ...

Zoology

... Cuvier , anatomical study has associated itself with the more superficial morphography until today no one considers a study of animal form of any value which does not include internal structure, histology and embryology in its scope. The real dawn of zoology after the legendary period of the ...
Other Contents
(Date:8/29/2014)... at UC Davis have made some surprising discoveries ... Studying simian immunodeficiency virus (SIV), the team found ... cells are early responders to viral invasion and ... a cytokine called interleukin-1 beta (IL-1β). , ... causes breakdown of the gut epithelium that provides ...
(Date:8/29/2014)... researcher from the University of Texas Medical Branch at Galveston ... monoclonal antibodies can completely protect monkeys against a lethal dose ... a time when the disease is severe. , Thomas Geisbert, ... Nature discussing advances in Ebola treatment research. The ... the most deadly of pathogens, with fatality rates of up ...
(Date:8/29/2014)... news release is available in German . ... key players in the natural nitrogen cycle on Earth ... specialist bacteria were thought to depend on nitrite as ... led by Holger Daims, a microbiologist at the University ... use hydrogen as an alternative source of energy. The ...
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(Date:9/2/2014)... Growing public support for marijuana legalization in the U.S. ... "safer" than other substances, such as alcohol. In January, ... that marijuana is more dangerous than alcohol. Despite the ... use as compared to alcohol use are not well ... Psychosocial Outcomes Associated with Drug Use among US High ...
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(Date:9/2/2014)... fact that mechanical heart valves increase risks during and ... ROPAC registry presented for the first time today in ... W. Roos-Hesselink, co-chair with Professor Roger Hall of the ... pregnant women with a mechanical heart valve died and ... Of Pregnancy And Cardiac disease (ROPAC) is an ongoing ...
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