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From Wikipedia, the free encyclopedia
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, noted for his subtle compositions

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, composition is the placement or arrangement of visual elements or 'ingredients' in a work of art, as distinct from the subject. It can also be thought of as the organization of the elements of art according to the principles of art .

The composition of a picture is different from its subject, what is depicted, whether a moment from a story, a person or a place. Many subjects, for example Saint George and the Dragon , are often portrayed in art, but using a great range of compositions even though the two figures are typically the only ones shown.

The term composition means 'putting together' and can apply to any work of art, from music to writing to photography, that is arranged using conscious thought. In the visual arts, composition is often used interchangeably with various terms such as design, form, visual ordering, or formal structure, depending on the context. In graphic design for press and desktop publishing , composition is commonly referred to as page layout .

Contents

Main article: Elements of art

The various visual elements, known as elements of design , formal elements , or elements of art, constitute the vocabulary with which the visual artist composes. These elements in the overall design usually relate to each other and to the whole art work.

The elements of design are:

Lines are optical phenomena that allow the artist to direct the eye of the viewer. The optical illusion of lines do exist in nature and visual arts elements can be arranged to create this illusion. The viewer unconsciously reads near continuous arrangement of different elements and subjects at varying distances. Such elements can be of dramatic use in the composition of the image. These could be literal lines such as telephone and power cables or rigging on boats. Lines can derive also from the borders of areas of differing color or contrast, or sequences of discrete elements. Movement is also a source of line, and blur can also create a reaction. [ Footlocker Finishline For Sale Cheap Best Seller OEM high top men air fashion sport no brand name basketball shoes 85M3keN
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Subject lines contribute to both mood and linear perspective , giving the viewer the illusion of depth. Oblique lines convey a sense of movement and angular lines generally convey a sense of dynamism and possibly tension. Lines can also direct attention towards the main subject of picture, or contribute to organization by dividing it into compartments. The artist may exaggerate or create lines perhaps as part of their message to the viewer. Many lines without a clear subject point suggest chaos in the image and may conflict with the mood the artist is trying to evoke. [ citation needed ]

Assignment to super is not allowed.

null represents the null value for pointers, pointers to functions, delegates, dynamic arrays, associative arrays, and class objects. If it has not already been cast to a type, it is given the singular type typeof(null) and it is an exact conversion to convert it to the null value for pointers, pointers to functions, delegates, etc. After it is cast to a type, such conversions are implicit, but no longer exact.

These are of type bool and when cast to another integral type become the values 1 and 0, respectively.

Character literals are single characters and resolve to one of type char , wchar , or dchar . If the literal is a \u escape sequence, it resolves to type wchar . If the literal is a \U escape sequence, it resolves to type dchar . Otherwise, it resolves to the type with the smallest size it will fit into.

String literals can implicitly convert to any of the following types, they have equal weight:

By default, a string literal is typed as a dynamic array, but the element count is known at compile time. So all string literals can be implicitly converted to static array types.

String literals have a 0 appended to them, which makes them easy to pass to C or C++ functions expecting a const char* string. The 0 is not included in the .length property of the string literal.

Array literals are a comma-separated list of AssignExpression s between square brackets [ and ] . The AssignExpression s form the elements of a dynamic array, the length of the array is the number of elements. The common type of the all elements is taken to be the type of the array element, and all elements are implicitly converted to that type.

By default, an array literal is typed as a dynamic array, but the element count is known at compile time. So all array literals can be implicitly converted to static array types.

If any of the arguments in the ArgumentList are a ValueSeq , then the elements of the ValueSeq are inserted as arguments in place of the sequence.

Array literals are allocated on the memory managed heap. Thus, they can be returned safely from functions:

When array literals are cast to another array type, each element of the array is cast to the new element type. When arrays that are not literals are cast, the array is reinterpreted as the new type, and the length is recomputed:

Associative array literals are a comma-separated list of key : value pairs between square brackets [ and ] . The list cannot be empty. The common type of the all keys is taken to be the key type of the associative array, and all keys are implicitly converted to that type. The common type of the all values is taken to be the value type of the associative array, and all values are implicitly converted to that type. An AssocArrayLiteral cannot be used to statically initialize anything.

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Measurements of glucose concentration can be obtained from whole-blood samples or from plasma (or serum) samples. Ideally, glucose levels should be measured from plasma samples. This is particularly necessary when calculating glucose fluxes using isotopic techniques. There are commercially available instruments that measure glucose directly from plasma samples (e.g. from YSI, Analox). The advantage of these instruments is that plasma glucose values can be obtained during an experiment. However, this requires the acquisition of larger blood volumes (10–20 μl) and the additional step of separating plasma from blood cells. Alternatively, if a plasma glucose analyzer is not available, glucose values can be obtained from plasma samples using an enzymatic spectrophotometric or fluorometric assay following completion of the experiments.

Hand-held whole-blood glucose monitors (e.g. from Bayer, Roche, BD) are more commonly used than plasma glucose analyzers. Because of their size, they are more practical than plasma analyzers, particularly when performing multiple experiments at once. Another advantage of whole-blood monitors is that they require small blood volumes – typically 5 μl or less. This is especially advantageous in tests that require multiple sampling (e.g. GTTs, ITTs, clamp experiments). As previously stated, if isotopic techniques are used to assess glucose flux, then glucose concentration should be measured from plasma samples. This can be done following completion of the experiment using an enzymatic assay.

It is important to note that whole-blood glucose monitors are designed for measurement of glucose in human blood. The AlphaTRAK whole-blood glucose monitor by Abbott Laboratories is advertised as being calibrated for the unique properties of animal blood. One advantage of this monitor is that it has a much higher range (i.e. up to ∼1000 mg/dl) compared with other hand-held monitors. Notably, the regression line obtained when comparing whole-blood glucose values from the AlphaTRAK® glucose monitor versus plasma glucose values determined with an enzymatic assay does not intersect the y -axis at zero ( Discount Very Cheap TOSJC 2018 Summer Sneakers Casual Whiter Shoes White Buy Cheap Affordable Sale Best Seller Czcxf
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). The regression line comparing the two different whole-blood glucose monitors also does not intersect the y -axis at zero ( Fig. 2 ). Given the differences between monitors, investigators should select the brand of monitor they deem most accurate (i.e. when whole-blood glucose values are compared with plasma glucose values) and only use that brand of monitor.

Fig. 2.

Comparison of whole-blood glucose meters and plasma glucose measurements. The regression line obtained when comparing glucose values obtained using the AlphaTRAK® (top panel) or the Accu-Chek Advantage (middle panel) whole-blood glucose monitors and plasma glucose values obtained using an enzymatic assay does not intersect the -axis at zero. Comparison of glucose values obtained with each monitor (bottom panel) shows that the regression line also does not intersect the -axis at zero.

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Measurement of fasting glucose and insulin is a simple screening method for detecting alterations in glucose metabolism. Typically, a single blood sample is taken from an unrestrained mouse by cutting off the tip of the tail or via an arterial catheter. Alternatively, retro-orbital bleeding can also be used to obtain samples. Methods for measuring glucose have been discussed. There are many commercially available kits for measuring plasma insulin levels, either by radioimmunoassay or by ELISA. Plasma requirements for these assays range from 5–25 μl.

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