California flora     

Rabeler RK 《Science (New York, N.Y.)》1993,262(5131):261

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Cold fusion difficulty     

Oriani RA 《Science (New York, N.Y.)》1993,261(5119):279-280

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Transportation costs and the national debt     

Haensel V 《Science (New York, N.Y.)》1993,262(5131):163-164

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Called ;trimates,' three bold women shaped their field     

Morell V 《Science (New York, N.Y.)》1993,260(5106):420-425

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Response     

Olby R 《Science (New York, N.Y.)》1993,261(5128):1508

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Protein synthesis measured in the whole body of chick embryos cultured in vitro     

K. Kita  S. Nakagawa  R. Pinontoan  J. Okumura  T. Muramatsu 《British poultry science》1993,34(5):1043-1047

1. Whole body protein synthesis was measured in chick embryos cultured in vitro. On day 7 of incubation chick embryos were cultured for 60 min in synthetic serum‐free medium containing 4‐[³H]phenylalanine. Specific radioactivities in free and protein‐bound phenylaline in the whole embryo were measured, starting 2 min after commencement of the culture process.

2. The values for fractional synthesis rate (FSR) estimated in vitro at 20, 30, 45 and 60 min during the embryo culture agreed well, ranging from 35 to 40%/d, suggesting that the method would serve as a useful model for studying the effect of growth promoters in chick embryos.

3. Bovine insulin in the synthetic medium did not affect FSR of protein in chick embryos cultured in vitro.  相似文献   

Monitoring pregnancy losses in small dairy herds     

Lemire GE  Stalheim PS  Lemire MR  Tiemann M  Verdon L 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(1):33-35

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Limitations of automobile insurance     

Horne RB 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(1):9

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Insure to ensure     

Horne RB 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(1):7

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Electrochemical detection of single molecules     

Fan FR  Bard AJ 《Science (New York, N.Y.)》1995,267(5199):871-874

The electrochemical behavior of a single molecule can be observed by trapping a small volume of a dilute solution of the electroactive species between an ultramicroelectrode tip with a diameter of approximately 15 nanometers and a conductive substrate. A scanning electrochemical microscope was used to adjust the tip-substrate distance ( approximately 10 nanometers), and the oxidation of [(trimethylammonio)methyl] ferrocene (Cp(2)FeTMA(+)) to Cp(2)FeTMA(2+) was carried out. The response was stochastic, and anodic current peaks were observed as the molecule moved into and out of the electrode-substrate gap. Similar experiments were performed with a solution containing two redox species, ferrocene carboxylate (Cp(2)FeCOO(-)) and Os(bpy)(3)(2+) (bpy is 2,2'-bipyridyl).  相似文献