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Water balance of terrestrial anuran (Eleutherodactylus Coqui) eggs: importance of parental care
(The Ecological Society of America: Ecology, 1984-02)
The terrestrial eggs of the coqui of Puerto Rico are brooded almost continuously by the male parent from the time of oviposition until the fully metamorphosed hatchlings emerge from the eggs 15-20 d later. The gelatinous ...
Aqueous shift reagents for high-resolution cationic nuclear magnetic resonance. III. Dy(TTHA)3−, Tm(TTHA)3−, and Tm(PPP)27−
(Elsevier: Journal of Magnetic Resonance, 1984-01)
The isotropic hyperfine shifts induced in the 23Na+ resonance by the shift reagents Dy(DPA)33−, Dy(NTA)23−, Dy(PPP)27−, Tm(PPP)27−, Dy(TTHA)3−, and Tm(TTHA)3− are compared under similar conditions. The last three are ...
Crystal and molecular structure of a dinuclear ortho-metalated platinum ylid complex, [Pt(u-Cl)CH3COCHP(C6H4)(C6H5)2]2*2CDCl3
(The American Chemical Society: Organometallics, 1983-10)
The product of the reaction between PtCl2 and APPY (APPY = acetylmethylenetriphenylphosphorane, (C6H5)3PCHC(O)CH3), upon heating a 1:2 mole ratio at reflux in acetonitrile for 44 h, was originally formulated as Pt(APPY)2C12 ...
Critical behavior of a microemulsion studied by small-angle neutron scattering
(American Physical Society, 1983-07)
The critical behavior of a three-component water-in-oil microemulsion was studied by small-angle neutron scattering. Intensity spectra were analyzed by the treatment of critical scattering as arising from concentration ...
Specializations of the body form and food habits of snakes
(Oxford University Press: American Zoologist, 1983)
Viperid snakes have stouter bodies, larger heads, and longer jaws than snakes in other families; there are no major differences between the two subfamilies of vipers in these features. A suite of morphological characters ...
Population density of tropical forest frogs: relation to retreat sites
(American Association for the Advancement of Science: Science, 1983)
The forest frog Eleutherodactylus coqui defends specific sites for retreats and nests in the Luquillo Forest, Puerto Rico. The hypothesis that shortages of nest and retreat sites limit population size was tested by placing ...
36Cl bomb pulse measured in a shallow ice core from Dye 3, Greenland
(Nature Publishing Group: Nature, 1982-12-23)
Nuclear weapons tests at oceanic sites during the 1950s produced a large amount of 36Cl (t 1/2 = 3.0 105 yr) through neutron capture of 35Cl in seawater. Part of this anthropogenic 36Cl was injected into the stratosphere ...
Thermonuclear 36Cl pulse in natural water
(Nature Publishing Group: Nature, 1982-12-23)
Radionuclides produced by atmospheric testing of nuclear weapons have been used as environmental tracers for the past 30 years. 185W and 90Sr have proved valuable in monitoring atmospheric circulation1, 14C has been applied ...
Comparison of through-space and through-bond interactions in four-membered ring systems
(The American Chemical Society: Journal of Physical Chemistry, 1982-09-30)
Numerous authors have discussed the interactions between nondirectly bonded functions in terms of direct “though-space” orbital interactions and/or “through-bond” orbital interactions. In this study, ab initio interaction ...
Reaction of 2,4-dinitrobenzenesulfenyl chloride with quadricyclene
(The American Chemical Society: The Journal of Organic Chemistry, 1982-04-09)
The treatment of quadricyclene with 2,4-dinitrobenzenesulfenyl chloride has been reinvestigated and chloro adducts 1-A and 2b-A as well as acetates 4a-A, 4b-A, 6, and 7 have been obtained. Establishing 2b-A with endo-chloride ...