Browsing UMBC Biological Sciences Department by Issue Date
Now showing items 21-40 of 644
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Altered regulation of the glnA gene in glutamine synthetase mutants of Bacillus subtilis
(American Society for Microbiology, 1986-07-01)Expression of beta-galactosidase by Bacillus subtilis strains carrying transcriptional fusions of the glnA promoter region to the Escherichia coli lacZ gene was found to be regulated by the nitrogen source in glnA+ strains. ... -
Transcription of ribosomal genes during a nutritional shift-up of Escherichia coli
(American Society for Microbiology, 1986-09)We measured the differential transcription rates of individual ribosomal operons after a nutritional shift-up. All operons showed a transient increase in transcription. However, the response of the S10 ribosomal protein ... -
Spectral sensitivity of the compound eyes in the purple land crab, Gecarcinus lateralis
(1987-08-17)The spectral sensitivities(S(λ)) of dark-adapted compound eyes of the purple land crab Gecarcinus lateralis posses a broad maximum in the blue-green, 420-530 nm,when measured by electroretinographic (ERG) techniques. ... -
Autogenous control of the S10 ribosomal protein operon of Escherichia coli: genetic dissection of transcriptional and posttranscriptional regulation
(National Academy of Sciences, 1987-09)The S10 ribosomal protein operon is regulated autogenously by the product of one of the genes of the operon, the gene encoding ribosomal protein L4. We have used site-directed mutagenesis to isolate leader mutations affecting ... -
Ocular Tracking of Rapidly Moving Visual Targets by Stomatopod Crustaceans
(Company of Biologists, 1988)1. Ocular tracking in two species of stomatopod crustaceans, Squilla empusa (Say) and Gonodactylus oerstedii (Hansen), was studied by presenting animals with small targets moving to their right and left. 2. Squilla ... -
Secondary structure of the leader transcript from the Escherichia coli S10 ribosomal protein operon
(Oxford University Press, 1988-09-26)Genetic analysis of the autogenous control of the S10 ribosomal protein operon of Escherichia coli has suggested that the secondary or tertiary structure of the leader transcript is important for this regulation. We have ... -
Translational coupling of the two proximal genes in the S10 ribosomal protein operon of Escherichia coli
(American Society for Microbiology, 1989-05)We have examined the translational coupling between the first two genes in the S10 ribosomal protein operon. We isolated mutations blocking the translation of the first gene of the operon, coding for S10, and monitored ... -
Spectral Sensitivity of Vision in the Mantis Shrimp, Gonodactylus oerstedii, Determined Using Noninvasive Optical Techniques
(The Biological bulletin, 1989-06-01)Compound eyes of stomatopod crustaceans have many unique design features. Recently developed intracellular optical physiology techniques permit the measurement of spectral sensitivity functions in intact eyes of these ... -
Autogenous control is not sufficient to ensure steady-state growth rate-dependent regulation of the S10 ribosomal protein operon of Escherichia coli
(American Society for Microbiology, 1990-01)The regulation of the S10 ribosomal protein operon of Escherichia coli was studied by using a lambda prophage containing the beginning of the S10 operon (including the promoter, leader, and first one and one-half structural ... -
Ribosomal protein L4 stimulates in vitro termination of transcription at a NusA-dependent terminator in the S10 operon leader
(National Academy of Sciences, 1990-04)The 11-gene S10 ribosomal protein operon of Escherichia coli is under the autogenous control of L4, the product of the third gene of the operon. Ribosomal protein L4 inhibits both transcription and translation of the operon. ... -
Intermediates in the degradation of mRNA from the lactose operon of Escherichia coli
(Oxford University Press, 1991-05-25)We have analyzed the processing of mRNA from the lac operon in an Escherichia coli strain carrying the lac on a multicopy plasmid. Messenger RNA was analyzed by hybridization and nuclease protection of pulse-labeled RNA ... -
Regional Specialization for Control of Ocular Movements in the Compound Eyes of a Stomatopod Crustacean
(Company of Biologists, 1992)1. Regional specialization within the triple compound eyes of the gonodactyloid stomatopod Gonodactylus oerstedii (Hansen) was studied by examining how ocular tracking of a small target was affected after occluding vision ... -
A new rRNA processing mutant of Saccharomyces cerevisiae
(Oxford University Press, 1992-01-25)We have identified from a collection of temperature sensitive yeast mutants strains which fail to process rRNA normally. Characterization of one such mutant is reported here. This strain accumulates increased amounts of ... -
Interaction of the Bacillus subtilis glnRA repressor with operator and promoter sequences in vivo
(American Society for Microbiology (ASM), 1992-02)In vivo dimethyl sulfate footprinting of the Bacillus subtilis ginRA regulatory region under repressing and derepressing conditions demonstrated that the GlnR protein, encoded by glnR, interacts with two sites situated within ... -
Visual Rhythms in Stomatopod Crustaceans Observed in the Pseudopupil
(1992-04)Many aspects of visual function in animals are influenced by the operation of endogenous rhythms. Using techniques of intracellular optical physiology, I investigated visual rhythms in two species of stomatopod crustaceans ... -
A high-mobility-group protein and its cDNAs from Drosophila melanogaster
(American Society for Microbiology, 1992-05)We have identified, purified, and characterized a high-mobility-group (HMG) protein and its cDNAs from Drosophila melanogaster. This protein, HMG D, shares most of the characteristics of vertebrate HMG proteins; it is ... -
Ribosomal protein L4 and transcription factor NusA have separable roles in mediating terminating of transcription within the leader of the S10 operon of Escherichia coli
(Cold Spring Harbor Laboratory Press, 1992-10-14)Ribosomal protein L4 of Escherichia coli autogenously regulates both transcription and translation of the 11-gene S10 operon. Transcription regulation occurs by L4-stimulated premature termination at an attenuator hairpin ... -
Altered regulation of the glnRA operon in a Bacillus subtilis mutant that produces methionine sulfoximine-tolerant glutamine synthetase
(American Society for Microbiology, 1993-02)A Bacillus subfilis mutant that produced glutamine synthetase (GS) with altered sensitivity to DL-methionine sulfoximine was isolated. The mutation, designated glnA33, was due to a T- A-to-C- G transition, changing valine ... -
Domain I of 23S rRNA competes with a paused transcription complex for ribosomal protein L4 of Escherichia coli
(Oxford Universiiy Press, 1993-05-25)Ribosomal protein L4 of Escherichia coli regulates expression of its own eleven gene S10 operon both by inhibiting translation and by stimulating premature termination of transcription. Both regulatory processes presumably ... -
The RNA of RNase MRP is required for normal processing of ribosomal RNA
(National Academy of Sciences, 1994-01-18)We have isolated clones which complement the temperature sensitivity and abnormal rRNA processing pattern of the rrp2-2 mutant of Saccharomyces cerevisiae we previously described. DNA sequencing and restriction analysis ...