Results 201 to 210 of about 28,237 (223)

Heterogeneity in ampR-ampC Gene Interaction in Enterobacter cloacae

Clinical Infectious Diseases, 1988
The ampR gene and its regulation of AmpC beta-lactamase synthesis were investigated for Enterobacter cloacae 1194E, a wild-type strain producing a group A (pI 8.7) enzyme. Expression of the cloned E. cloacae 1194E ampR-ampC region was examined initially in Escherichia coli HB101. However, transformants showed only constitutive beta-lactamase expression.
R V, Goering, C C, Sanders, W E, Sanders, R, Guay, S, Guerin   +4 more
openaire   +2 more sources

Interactions of wild‐type and mutant AmpR of Citrobacter freundii with target DNA

Molecular Microbiology, 1993
SummaryThe AmpR transcriptional activator for the chromosomal ampCβ‐lactamase gene of Citrobacter freundii was found to interact with an operator sequence located in the 5′ half of the 38 bp region protected by AmpR in DNase I footprinting experiments. AmpR binding was associated with significant DNA bending of target DNA.
E, Bartowsky, S, Normark
openaire   +2 more sources

Translation in Escherichia coli mini-cells containing hamster mitochondrial DNA-Co1E1 · Ampr recombinant plasmids

Biochimica et Biophysica Acta (BBA) - Nucleic Acids and Protein Synthesis, 1977
Hamster mitochondrial DNA is cleaved into two fragments (4.2 and 11.4 kilobase pairs of DNA (kb)) by the restriction enzyme, Eco RI. Recombinant DNA molecules formed in vitro between an Escherichia coli plasmid, Co1E1 - Ampr, and Eco RI-digested hamster mitochondrial DNA were transformed into E. coli K12. The translation products of the parent plasmid,
D L, Miller, T L, Andreone, J E, Donelson   +2 more
openaire   +2 more sources

Introduction of an AmpR-L2 intergenic segment attenuates the induced β-lactamase activity of Stenotrophomonas maltophilia

European Journal of Clinical Microbiology & Infectious Diseases, 2010
Expression of the L1 and L2 beta-lactamase genes is generally regulated by a LysR type regulator of the AmpR in Stenotrophomonas maltophilia. The ampR gene is located immediately upstream of L2 and is transcribed divergently, forming an ampR-L2 module. The ampR-L2 modules of 16 S.
Y-C, Chang, Y-W, Huang, K-H, Chiang, T-C, Yang, T-C, Chung   +4 more
openaire   +2 more sources

AMPred-CNN: Ames mutagenicity prediction model based on convolutional neural networks

Computers in Biology and Medicine
Mutagenicity assessment plays a pivotal role in the safety evaluation of chemicals, pharmaceuticals, and environmental compounds. In recent years, the development of robust computational models for predicting chemical mutagenicity has gained significant attention, driven by the need for efficient and cost-effective toxicity assessments.
Thi Tuyet Van Tran, Hilal Tayara, Kil To Chong   +2 more
openaire   +2 more sources

The role of AmpR in regulation of L1 and L2 β-lactamases in Stenotrophomonas maltophilia

Research in Microbiology, 2009
Stenotrophomonas maltophilia is known to produce at least two chromosomal-mediated inducible beta-lactamases, L1 and L2. Gene L2, which encodes a class A beta-lactamase, and the adjacent ampR gene form an ampR-class A beta-lactamase module. L1 belongs to the class B beta-lactamase and has no neighbor ampR-like regulatory gene.
Cheng-Wen, Lin, Yi-Wei, Huang, Rouh-Mei, Hu, Kai-Hung, Chiang, Tsuey-Ching, Yang   +4 more
openaire   +2 more sources

Biological and Chemical Transformation of the Six-Carbon Polyfluoroalkyl Substance N-Dimethyl Ammonio Propyl Perfluorohexane Sulfonamide (AmPr-FHxSA)

Environmental Science & Technology, 2022
Sites impacted by aqueous film-forming foam (AFFF) contain co-contaminants that can stimulate biotransformation of polyfluoroalkyl substances. Here, we compare how microbial enrichments from AFFF-impacted soil amended with diethyl glycol monobutyl ether (found in AFFF), aromatic hydrocarbons (present in co-released fuels), acetate, and methane ...
Emily K. Cook, Christopher I. Olivares, Edmund H. Antell, Shan Yi, Anastasia Nickerson, Youn Jeong Choi, Christopher P. Higgins, David L. Sedlak, Lisa Alvarez-Cohen   +8 more
openaire   +2 more sources

Purification and mutant analysis of Citrobacter freundii AmpR, the regulator for chromosomal AmpC β‐lactamase

Molecular Microbiology, 1991
SummaryAmpR, the transcriptional regulator for the Citrobacter freundii ampC β‐lactamase gene, was purified. The purified AmpR had DNA‐binding activity, the same molecular mass (32 kDa) on sodium dodecyl sulphate polyacrylamide gel electrophoresis as previously described, and N‐terminal sequencing of the first 15 amino acids was in agreement with that ...
E, Bartowsky, S, Normark
openaire   +2 more sources

Study on pixel matching method of the multi-angle observation from airborne AMPR measurements

SPIE Proceedings, 2015
For the along-track scanning mode, the same place along the ground track could be detected by the Advanced Multi-angular Polarized Radiometer (AMPR) with several different scanning angles from -55 to 55 degree, which provides a possible means to get the multi-angular detection for some nearby pixels.
Weizhen Hou, Lili Qie, Zhengqiang Li, Xiaobing Sun, Jin Hong, Xingfeng Chen, Hua Xu, Bin Sun, Han Wang   +8 more
openaire   +1 more source

High Altitude Airborne Remote Sensing Mission Using The Advanced Microwave Precipitation Radiometer (AMPR)

[Proceedings] IGARSS'91 Remote Sensing: Global Monitoring for Earth Management, 2005
The advanced microwave precipitation radiometer (AMPR) is an airborne multichannel imaging radiometer used to better understand how the earth's climate structure works. Airborne data results from the October 1990 Florida thunderstorm mission in Jacksonville, FL, are described. AMPR data on atmospheric precipitation in mesoscale storms were retrieved at
J.A. Galliano, R.H. Platt, R. Spencer, R. Hood   +3 more
openaire   +1 more source