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Biomedical subjects

M Giesen

Publications and source records attributed to M Giesen.

At least 37 records · Page 2Linked to original sources
PubMed1977

[The investigation of different types of vocal disorder by statistical frequency analysis (author's transl)].

Common disorders of the vocal cords were assessed by indirect and direct laryngoscopy and by stroboscopy, and they were compared over the frequency range of "a". Amplitude and frequency variations from the normal are illustrated in recurrent laryngeal nerve paralysis, intubation granuloma, chronic oedema, the hyperkeratosis of chronic laryngitis, hypokinesia and hypokinetic dysphonia. In several cases, the effects of exercise or previous surgery are demonstrated. The described technique gives a useful aid to the management of vocal cord disease.

Aged↗
PubMed1976

Formation of an 80 S methionyl-tRNA initiation complex with soluble factors from wheat germ.

Wheat germ supernatant is resolved into four fractions, C3alpha, C3beta, D and A, all of which are required in addition to elongation EF1 and EF2 for tobacco mosaic virus-RNA (TMV-RNA)-catalyzed amino acid polymerization. Fractions C3beta and D function in the binding of Met-tRNAiMet to the 40 S ribosomal subunit forming an unstable 40 S-Met-tRNA1Met complex that is detected in sucrose gradients only after fixation with glutaraldehyde. Fraction C3beta binds Met-tRNAiMet suggesting that a C3beta-Met-tRNAiMet complex may be an intermediate in the formation of the 40 S complex. GTP is required for the formation of both the C3beta-Met-tRNAiMet and the 40 S-Met-tRNAiMet complexes. In either reaction the nucleotide is partially replaceable by quanyl-5'-yl methylene diphosphonate (GMP-P (CH2) P) while ATP is inactive. When ATP, C3alpha, mRNA, and magnesium acetate (final concentration 3.6 mM) are added to an incubation reaction containing the 40 S-Met-tRNAiMet complex, a stable 80 S-Met-tRNAiMet complex is formed. Radioactive TM virus-RNA binds specifically to the 80 S-Met-tRNAi complex suggesting that mRNA is a component of this complex. C3beta and D, the fractions required in the formation of the 40 S-Met-tRNAiMet complex, are also required for formation of the 80 S-Met-tRNAiMet complex. In addition, unlabeled Met-trnaiMet does not compete significantly with preformed 40 S-Met-tRNAiMet in the 80 S complex-forming reaction. These observations suggest that the 40 S-Met-tRNAiMet complex is an intermediate in the 80 S reaction. The 80 S-Met-tRNAiMet product of the sequential reaction is reactive with puromycin and on this basis it is tentatively considered to be a functional initiation complex. The additional requirement of Fraction A for amino acid polymerization suggests, however, that the initiation process may be more complex.

Binding Sites↗
PubMed1976

Isolation and characterization of a growth-cycle-reflecting, high-molecular-weight protein associated with Escherichia coli ribosomes.

A high-molecular-weight, acidic protein, acidic protein whose amount per ribosomal particle depends on the growth cycle is shown to be associated with Escherichia coli ribosomes. The protein is associated with ribosomes from cells harvested at different phases of the growth cycle, but a large increase in its amount is seen with ribosomes from post-exponential phase cells. The protein is only slightly washed off the ribosomes by 1 M NH4CL. When ribosomes are dissociated it remains entirely with the 30-S subunits. We have purified the protein to homogeneity. It has a molecular weight of 70 000 and its amino acid composition showed some resemblance to that of ribosomal protein S1. However, the two proteins ar-shown variation in the acetylation of L12 during the growth cycle, indicated that certain proteins of (or associated with) E. coli ribosmes may carry specific biochemical roles connected with cellular adaption toward the stationary phase.

Amino Acids↗
PubMed1975

False physiological feedback and persuasion: effect of fear arousal vs. fear reduction on attitude change.

Two experiments tested the hypothesis that increases in false physiological feedback of fear arousal will enhance persuasion and that reduction in the arousal feedback is unnecessary for increased persuasion to occur. Prior research has usually found a positive relation between level of arousal and persuasion, but support for the drive reduction hypothesis is tenuous. However, Harris and Jellison (1971) claimed support for such a hypothesis. They manipulated subjects' fear arousal cognitively via false physiological feedback while the subjects listened to a persuasive communication. The present experiments used a similar procedure in an attempt to test an "arousal only" against an "arousal reduction" hypothesis. Subjects listened to a persuasive speech while receiving false feedback via a meter concerning their fear arousal. In Experiment I half of the subjects received high arousal and half received moderate arousal information. Within each of these conditions half of the subjects had their arousal reduced, and the other half did not. In Experiment II subjects received either low arousal, high arousal, or high then low arousal feedback while listening. The results of the two studies generally provided support for the "arousal only" hypothesis. An interpretation in terms of Bem's attribution theory was tentatively suggested.

Arousal↗
PubMed1975

[Clinical diagnosis of the auditory pathway using different acoustical evoked responses (author's transl)].

Evoked responses originating from cochlea, brain stem, and cortex are clinically used for differential diagnosis of hearing losses. The diagnostic range and the reliability of the different ERA methods are discussed. In our clinic brain stem potentials recorded by a nonsurgical method have been used as a routine audiometric test in more than 900 cases. The procedure has proved to be easier than electrocochleography and gives nearly the same information about cochlear and middle ear function if there is no VIIIth nerve or lower brain stem damage. For topical diagnosis of the lower auditory pathway additional recording of ECoG is necessary. In the examination of a cortical deafness the recording of brain stem potentials yields the same result as the electrocochleography according to Aran (Fig. 2). In a case of an Apallic syndrome (Fig. 3) brain stem potentials are found only for high intensity clicks, and latencies are abnormally increased. The cochlear potentials simultaneously recorded from the promontory are quite normal. So damage of the brain stem is confirmed.

Adult↗