that natural selection should favor the ability of animals to modify the sex ratio of their offspring whenever the net fi tness benefi ts of producing sons or daughters vary as a function of parental condition. For example, when males compete strongly for females and have greater variance in reproductive success than females, parents in good condition should invest more in sons. Parents in poor...

Mary Salisbury is President, The Cedar Institute, Inc., N. Kingstown, RI. Susan M. Hohenhaus is President, Hohenhaus & Associates, Inc, Wellsboro, Pa. For correspondence, write: Susan M. Hohenhaus, MA, RN, FAEN, 6 Willard Terrace, Wellsboro, PA 16901; E-mail: [email protected]. J Emerg Nurs 2008;34:46-8. 0099-1767/$34.00 Copyright n 2008 by the Emergency Nurses Association. doi: 10.1016/j.jen.20...

in this paper, we are interested to study the sine-gordon equation in generalized functions theory introduced by colombeau, in the first we give result of existence and uniqueness of generalized solution with initial data are distributions (elements of the colombeau algebra). then we study the association concept with the classical solution.

Systematic deviations in sex ratio may be adaptive in the face of the prevailing environmental or physiological cues experienced by the mother; yet some theoretical and mechanistic hypotheses remain at odds and are rarely examined noninvasively under natural conditions. Conventional interpretations of the Trivers and Willard (Trivers RL, Willard DE. 1973. Natural selection of parental ability t...

In this paper, we solve a inhomogeneous fractional Klein-Gordon equation by the method of separating variables. We apply the method for three boundary conditions, contain Dirichlet, Neumann, and Robin boundary conditions, and solve some examples to illustrate the effectiveness of the method.

Angelica urumiensis Mozaff. and Eryngium iranicum Mozaff. are described as new species from Iran. Aphanopleura trachysperma Boiss. and Pastinaca sativa L. subsp. urens (Req. ex Gordon) Čelak are reported as new records from Iran.