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Now showing items 731-740 of 767
Acid precipitation and embryonic mortality of spotted salamanders, Ambystoma maculatum
(American Association for the Advancement of Science: Science, 1976-04-02)
Spotted salamanders breed in temporary pools formed in early spring by melted snow and rain. Many of these pools reflect the low pH of precipitation in the northeastern United States. Egg mortality is low (less than 1 ...
The role of fatigue in temperature resistance of salamanders
(Elsevier: Journal of Thermal Biology, 1976-04)
1. We measured temperature resistance and lactic acid production of Notophthalmus viridescens and Plethodon cinerus acclimated to 10, 20 or 30°C.
2. Fatigue is responsible for the Loss of Righting Response (LRR) observed ...
Palladium/hydrogen catalyzed alcoholysis of benzylsilanes
(Elsevier: Journal of Organometallic Chemistry, 1976)
Certain benzylsilanes are converted to methoxy or ethoxysilanes and toluene when treated with methanol or ethanol in the presence of hydrogen and catalytic amounts of palladium on charcoal. The reaction is promoted by a ...
Salt excretion in a beach lizard (Ameiva quadrilineata, Teiidae)
(Springer: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 1976-01)
The teiid lizardAmeiva quadrilineata has a nasal salt gland that responds to NaCl loading by increasing excretion of Na+ (from 1.12 to 2.63 uM/100 gh), K+ (from 0.14 to 2.43 uM/100 gh), and Cl– (from 1.10 to 5.47 uM/100 ...
Stereochemistry and mechanism of ionic cyclopropane ring cleavage by arenesulfenyl chloride addenda in quadricyclene systems
(The American Chemical Society: The Journal of Organic Chemistry, 1975-10-17)
Addition of benzenesulfenyl chloride to quadricyclenedicarboxylic acid (la) and to the corresponding dimethyl ester (1b) gave adducts [exo-5-chloro-endo-3-phenylthiotricyclo[2.2.1.0^2,6]heptane-2,exo-3-dicarboxylic acid ...
The Esterolytic activity of poly(1-methyl-4- and -5-vinylimidazole) in water
(American Chemical Society: Macromolecules, 1975-07)
The water solubility of poly(1-Me-5-VIm) has made it possible to achieve phenomenal rate enhancements and to gain even greater insight into the mechanism of catalysis by polymeric imidazoles. The poly(l-Me-5-V1m)-catalyzed ...
The Esterolytic activity of poly(N-alkylimidazoles) in ethanol-water. The poly(1-methyl-5-vinylimidazole)-catalyzed hydrolysis of p-nitrophenyl acetate and 3-nitro-4-acetoxybenzoic acid
(American Chemical Society: Macromolecules, 1975-07)
1-Methyl-4-vinylimidazole (1-Me-4-VIm) and 1-methyl-5-vinylimidazole (1-Me-5-VIm) have been synthesized and polymerized. The esterolytic activity of these polymers in 28.5% ethanol-water toward p-nitrophenyl acetate (PNPA) ...
The Esterolytic activity of poly(N-alkylimidazoles). The effect of ester chain length in the substrate and alkyl chain length in the catalyst on the esterolytic activity of poly(N-alkylimidazoles).
(American Chemical Society: Macromolecules, 1975-07)
In an effort to exploit the enhancement in catalytic activity which might be derived through hydrophobic interactions between polymeric catalyst and substrate, 1-methyl-5-vinylimidazole (l-Me-5-VIm), l-methyl-4-vinylimidazole ...
Nonlinear optimization; some applications to colorant formulations
(The Optical Society of America, 1975-06)
The total synthesis and anti-fertility activity of 6-silasteroids
(Elsevier: Tetrahedron, 1975)
4,4-Dimethyl-6-methoxy-4-sila-1-tetralone (2) was prepared by a modified literature procedure and converted to 3-methoxy-6,6-dimethyl-6-silaestra-1,3,5(10),8,14-pentaen-17β-yl acetate (5c). Catalytic hydrogenation of 5c ...