METHOD FOR THE DETECTION OF INDOLE     

Jacobs MB  Pincus S 《Science (New York, N.Y.)》1945,102(2643):204-206

A simple and sensitive method for the detection of indole in cultures, urine, sewage, etc., is presented. The indole is extracted with chloroform and is then treated with a modified Ehrlich reagent. The possibility of use for the detection of water pollution is indicated.  相似文献   

Change of birds' notes     

Jacobs FO 《Science (New York, N.Y.)》1883,2(27):167-169

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Gene flow or heterozygote advantage?     

Berrigan D  Evans J  Holway D  Jacobs L  Richards M  Seger J 《Science (New York, N.Y.)》1994,263(5150):1157

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A fossil snake with limbs     

Tchernov E  Rieppel O  Zaher H  Polcyn MJ  Jacobs LL 《Science (New York, N.Y.)》2000,287(5460):2010-2012

A 95-million-year-old fossil snake from the Middle East documents the most extreme hindlimb development of any known member of that group, as it preserves the tibia, fibula, tarsals, metatarsals, and phalanges. It is more complete than Pachyrhachis, a second fossil snake with hindlimbs that was recently portrayed to be basal to all other snakes. Phylogenetic analysis of the relationships of the new taxon, as well as reanalysis of Pachyrhachis, shows both to be related to macrostomatans, a group that includes relatively advanced snakes such as pythons, boas, and colubroids to the exclusion of more primitive snakes such as blindsnakes and pipesnakes.  相似文献   

Selective chemical catalysis by an antibody   总被引：20，自引：0，他引：20  

S J Pollack  J W Jacobs  P G Schultz 《Science (New York, N.Y.)》1986,234(4783):1570-1573

The immunoglobulin MOPC167, which binds the transition state analog p-nitrophenylphosphorylcholine with high affinity, catalyzed the hydrolysis of the corresponding carbonate 1. MOPC167 catalysis displayed saturation kinetics with catalytic constant (kcat) = 0.4 min-1 and Michaelis constant (Km) = 208 microM, showed substrate specificity, and was inhibited by p-nitrophenylphosphorylcholine. The rate of the reaction was first order in hydroxide ion concentration between pH 6.0 and 8.0. The lower limit for the rate of acceleration of hydrolysis by the antibody above the uncatalyzed reaction was 770. This study begins to define the rules for the generation of catalytic antibodies.  相似文献   

Research in parasites     

Jacobs L 《Science (New York, N.Y.)》1967,156(3782):1553

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Spectral tuning of pigments underlying red-green color vision   总被引：18，自引：0，他引：18  

M Neitz  J Neitz  G H Jacobs 《Science (New York, N.Y.)》1991,252(5008):971-974

Variations in the absorption spectra of cone photopigments over the spectral range of about 530 to 562 nanometers are a principal cause of individual differences in human color vision and of differences in color vision within and across other primates. To study the molecular basis of these variations, nucleotide sequences were determined for eight primate photopigment genes. The spectral peaks of the pigments specified by these genes spanned the range from 530 to 562 nanometers. Comparisons of the deduced amino acid sequences of these eight pigments suggest that three amino acid substitutions produce the approximately 30-nanometer difference in spectral peaks of the pigments underlying human red-green color vision, and red shifts of specific magnitudes are produced by replacement of nonpolar with hydroxyl-bearing amino acids at each of the three critical positions.  相似文献   

Play ball!     

Jacobs RA 《Science (New York, N.Y.)》1995,268(5218):1683

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Intrathecal interferon for multiple sclerosis     

Jacobs L  O'malley J  Freeman A  Ekes R 《Science (New York, N.Y.)》1982,217(4556):269-270

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Freshening of the Ross Sea during the late 20th century     

Jacobs SS  Giulivi CF  Mele PA 《Science (New York, N.Y.)》2002,297(5580):386-389

Ocean measurements in the Ross Sea over the past four decades, one of the longest records near Antarctica, reveal marked decreases in shelf water salinity and the surface salinity within the Ross Gyre. These changes have been accompanied by atmospheric warming on Ross Island, ocean warming at depths of approximately 300 meters north of the continental shelf, a more negative Southern Oscillation Index, and thinning of southeast Pacific ice shelves. The freshening appears to have resulted from a combination of factors, including increased precipitation, reduced sea ice production, and increased melting of the West Antarctic Ice Sheet.  相似文献