value

Zoology

...day 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 Middle Ages is connected with the name of an Englishman , Edward Edward Wotton , born at Oxford in...

Vitamin

...rences 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 liver would help cure night blindness, now known to be caused by a Vitamin A deficiency. In 174...

Sociobiology

...neral, 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 study, but extremely controversial. There are persuasive arguments that in some uncivilized environme...

Signal transduction

...rmone; [HR]=receptor-bound hormone The important value for the strength of the signal relayed by the rece...oncentration of the circulating hormone is the key value for the strength of the signal, since the other two values are constant. For fast reaction, the horm...

Potential energy

...servative and it is possible to define a numerical value of potential associated with every point in space....of a 1D or 2D potential function with the function value scale increasing upward is useful to visualize the potential field: a ball rolling to the lowest par...

Paternity testing

...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 erstwhile (?) parent can undertake at their own expense, without necessarily informing anyone either ab...

Nutrition

...vices 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 vitamins? . Criticism of the Food Pyramid in the Wall Street Journal, 2002 Discussion of China Pr...

Magnetic resonance imaging

...mical 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 of chemical information about that region, as would an NMR spectrum of that region. Functional MRI...

Michaelis-Menten kinetics

...V max can be given. Instead, the characteristic value for the enzyme is defined by the substrate concent...t its half-maximum speed ( V max /2 ). This K M value is also called Michaelis-Menten constant . Contents showTocToggle("show","hide") 1 Mich...

Metapopulation

... 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, that N is always less than one, implies that some fraction of a species habitat will always be unoccupied....

Insulin

...oduce 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 was also a success, and he helped publish their results privately in Toronto that November. However ...

Hydrolysis

...quation: 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 theme of physiological irreversibility of hydrolysis is used consistently in metabolic pathways, sin...

Human

...oup, 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 norms, and artifacts . Values are ideas about what is important. Norms are expectations of how people...

Hardy-Weinberg principle

... degree of freedom is 3.84, and since the χ 2 value is less than this, the null hypothesis that the ...dash;Weinberg equilibrium: where the expected value from Hardy–Weinberg equilibrium is given by For example, for Ford's data above; F ...

Genetic fingerprinting

...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 even planted fake DNA evidence in his own body: Dr. Schneeberger of Canada raped one of his sedated pa...

Fitness landscape

...es 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, crossbreeding, and selection in evolution". In Proceedings of the Sixth International Congress on Genetics , pp. 35...

Electrophysiology

...otential 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 excitability by analyzing the action potentials produced by a cell. The most common electrophysiol...

DNA

...his 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 pair quickly converged upon a model, which they announced before Franklin herself published any of her...

Culture

...d 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 1952, Alfred Kroeber and Clyde Kluckhohn compiled a list of more than 200 different definitions of ...

Chi-square test

...word "expected" often does not denote an expected value , but an observable estimate of an expected value....

Full blood count

...s 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 hemoglobin (MCH) - the average amount of hemoglobin per red blood cell, in picograms . Mean cell hemoglobi...

Biodiversity

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

Biology

...es 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 descent of species , as well as their change over time, i.e. their evolution . Evolutionary biology is an...