Pearson Prentice Hall and our other respected imprints provide educational materials, technologies, assessments and related services across the secondary curriculum. Take a closer look at the instructional resources we offer for secondary school classrooms. Use the Web Code found in your Pearson textbook to access supplementary online resources. This review briefly notes recent findings important for understanding the composition of functions practice pdf mechanical functions of pulmonary surfactant.
Currently known surfactant-specific proteins and lipids are discussed, with an eye to their possible functions. Competing models of the alveolar subphase life cycle of surfactant are also presented. It is concluded that, in spite of much effort, we still do not understand the basic molecular mechanisms underlying surfactant’s rapid adsorption to the air-water interface. This article is about the programming concept. How those other classes gain access to the mixin’s methods depends on the language. Mixins are sometimes described as being “included” rather than “inherited”.
A mixin class acts as the parent class, containing the desired functionality. Mixins are useful when a programmer wants to share functionality between different classes. Instead of repeating the same code over and over again, the common functionality can simply be grouped into a mixin and then included into each class that requires it. Mixins allow inheritance and use of only the desired features from the parent class, not necessarily all of the features from the parent class. Mixin is a class from which another class can inherit slot definitions and methods. The Mixin usually does not have direct instances.
Since a Flavor can inherit from more than one other Flavor, it can inherit from one or more Mixins. Note that the original Flavors did not use generic functions. So, for example, a stream-lock-mixin can add locking around existing methods of a stream class. Both CLOS and Flavors allow the computed reuse via method combinations. Other method combinations are provided.
This is used, for example, with the border-mixin for graphical objects. A graphical object may have a generic width function. The border-mixin would add a border around an object and has a method computing its width. All return values are added and create the combined width of the object. Gilad Bracha and William Cook reinterpret different inheritance mechanisms found in Smalltalk, Beta and CLOS as special forms of a mixin inheritance. Some languages do not support mixins on the language level, but can easily mimic them by copying methods from one object to another at runtime, thereby “borrowing” the mixin’s methods. Other languages that do not support mixins can support them in a round-about way via other language constructs.