DNA-dependent RNA polymerases from Schneider 2-L cells of Drosophila. II. Response to infection by an endogenous picorna-like virus.
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Amanitins↗
Biomedical subjects
C Feng
Publications and source records attributed to C Feng.
Excerpta Medica abstracting journals: a case study of costs to medical school libraries.
A cost comparison study was made of Excerpta Medica's abstracting journals, based upon actual costs to a library. Unit costs were determined for six sections of EM as compared with six corresponding abstract journals. On average, EM sections were found to be 138% more costly than corresponding abstract journals. The effects of splitting of EM journal titles were also analyzed. This practice increases the price of a total subscription to EM and makes comprehensive information retrieval more difficult. A survey of medical school librarians as users of EM points to dissatisfaction with its increasing price, particularly when it results from title splitting.
Abstracting and Indexing↗
[Analgesic action of intracerebral injection of adrenaline in relation to that of morphine].
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Animals↗
Memory consolidation in Drosophila operant visual learning.
A new conditioning procedure, developed for the operant learning paradigm at the flight simulator, leads to stronger learning scores in wild-type flies. This procedure produces mean learning indices up to LI = 0.52. The heat-avoidance behavior acquired during training is very difficult to extinguish during extinction. Memory decays quickly during the first 3 hr after training and still is measurable 48 hr later. Disruption experiments demonstrate that memory can be disrupted by cold anesthesia within the first approximately 20 min after training, whereas KCl- and CXM-feeding regimens abolish memory soon after training and 3 hr later, respectively. These results initially suggest at least three distinct memory phases involved in memory consolidation in Drosophila after operant conditioning.
Animals↗
[Cloning and characterization of a novel mouse short-chain dehydrogenase/reductases cDNA mHsdl2#, encoding a protein with a SDR domaid and a SCP2 domain].
The short-chain dehydrogenases/reductases (SDRs) play important roles in body's metabolism. We cloned a novel mouse SDR cDNA which encodes a deduced HSD-like protein with a conserved SDR domain and a SCP2 domain. The 1.8 kb cDNA consists of 11 exons and is mapped to mouse chromosome 4B3. The corresponding gene is widely expressed in normal mouse tissues and its expression level in liver increases after inducement with cholesterol food. The predicted mouse HSDL2 protein, which has a peroxisomal target signal, is localized in the cytoplasm of NIH 3T3 cells.
Amino Acid Sequence↗
[Phylogenetic diversity and activity of anaerobic microorganisms of high-temperature horizons of the Dagang Oilfield (China)].
The number of microorganisms of major metabolic groups and the rates of sulfate-reducing and methanogenic processes in the formation waters of the high-temperature horizons of Dagang oilfield have been determined. Using cultural methods, it was shown that the microbial community contained aerobic bacteria oxidizing crude oil, anaerobic fermentative bacteria, sulfate-reducing bacteria, and methanogenic bacteria. Using cultural methods, the possibility of methane production from a mixture of hydrogen and carbon dioxide (H2 + CO2) and from acetate was established, and this result was confirmed by radioassays involving NaH14CO3 and 14CH3COONa. Analysis of 16S rDNA of enrichment cultures of methanogens demonstrated that these microorganisms belong to Methanothermobacter sp. (M. thermoautotrophicus), which consumes hydrogen and carbon dioxide as basic substrates. The genes of acetate-utilizing bacteria were not identified. Phylotypes of the representatives of Thermococcus spp. were found among 16S rDNAs of archaea. 16S rRNA genes of bacterial clones belong to the orders Thermoanaerobacteriales (Thermoanaerobacter, Thermovenabulum, Thermacetogenium, and Coprothermobacter spp.), Thermotogales, Nitrospirales (Thermodesulfovibrio sp.) and Planctomycetales. 16S rDNA of a bacterium capable of oxidizing acetate in the course of syntrophic growth with H2-utilizing methanogens was found at high-temperature petroleum reservoirs for the first time. These results provide further insight into the composition of microbial communities of high-temperature petroleum reservoirs, indicating that syntrophic processes play an important part in acetate degradation accompanied by methane production.
Anaerobiosis↗