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  • 1984  (120)
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  • 1984  (120)
  • 1
    Language: English
    In: Biophysical Journal, 1984, Vol.45(3), pp.645-646
    Keywords: Biology
    ISSN: 0006-3495
    E-ISSN: 1542-0086
    Source: ScienceDirect Journals (Elsevier)
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  • 2
    Language: English
    In: Perceptual and Motor Skills, 04/1984, Vol.58(2), pp.673-674
    Description: Undergraduate women were divided into 20 augmenters and 20 reducers at the median of 3.7 according to Petrie's method. Reducers recalled simple stimuli better than augmenters whether time was long or short. There were no differences for complex stimuli.
    Keywords: Psychology;
    ISSN: 0031-5125
    E-ISSN: 1558-688X
    Source: CrossRef
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  • 3
    Language: English
    In: Journal of neurophysiology, May 1984, Vol.51(5), pp.925-38
    Description: The properties of neuronal spike potentials ranging from 20 to 60 mV in size were studied in stable recordings made from the motor cortex of unanesthetized, unparalyzed cats. Histologic evidence that injection of horseradish peroxidase (HRP) was confined to single neurons and appropriately high levels of potassium measured with K+ ion-sensitive electrodes indicated that these recordings were obtained from single, intracellularly penetrated neurons. Pressure injection of small volumes of 4% HRP in 1 M KC1, intracellularly, was characteristically associated with transient increases in spike size and decreases in input resistance. Recoveries of HRP-filled dendritic processes without filling of somata were obtained from penetrations giving spikes smaller than the recorded resting potential (spike-undershoot recordings). Recordings with dendritic recoveries had higher input resistances and showed greater increases in spike size during pressure injection than did recordings with both somata and dendrites recovered. The activity in response to a weak click elicited in cells with spike potentials between 20 and 40 mV was as great or greater than that elicited in cells with larger spike potentials or in extracellularly recorded units. We conclude that many stable spike-undershoot recordings of neurons of the motor cortex of awake cats reflect penetrations of dendritic processes as opposed to injury because they show a) a normal functional response to weak auditory stimuli delivered over periods of many minutes, b) a reversible increase in spike size during pressure injection of small volumes of HRP in KC1 consistent with penetration of a cable remote from the site of spike generation, and c) the frequent recovery of HRP-marked dendrites without somata.
    Keywords: Motor Cortex -- Physiology
    ISSN: 0022-3077
    E-ISSN: 15221598
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  • 4
    Language: English
    In: Child development, June 1984, Vol.55(3), pp.963-72
    Description: An experimental task modeled after hypothesis-testing probes was devised to examine the hypotheses and strategies children (from grades K, 2, 4, and 6) used when making proportional judgments. Earlier studies of proportional reasoning have been limited by methodological inadequacies and by attempts to obtain a "static" measure of children's understanding of proportion concepts. The task used here was oriented toward determining the maximum level of performance a child was capable of without specific training. However, the children did not change or alter their hypotheses or strategies, even after negative feedback, probably because they did not actually receive a counter (square) of the designated color. Other results showed that choosing the set of elements with a greater proportion of, say, white squares in order to get a white square increased with age and increased when the stimulus squares were randomly displayed. In general, the hypotheses used by children at different grades conformed with a developmental sequence proposed by Piaget and Inhelder (even if the specific ages at which appropriate behaviors were observed did not so conform). Further attempts to describe how children acquire proportion concepts were discussed.
    Keywords: Child Development ; Concept Formation ; Problem Solving
    ISSN: 0009-3920
    E-ISSN: 14678624
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  • 5
    Article
    Article
    Language: English
    In: The Journal of the Acoustical Society of America, 10/1984, Vol.76(4), pp.1281-1281
    ISSN: 0001-4966
    Source: CrossRef
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  • 6
    Language: English
    In: Biochimica et biophysica acta, 21 December 1984, Vol.791(3), pp.285-93
    Description: The stability and physicochemical properties of the major trypsin inhibitor from the winged bean seed (designated trypsin inhibitor 2) have been studied in solution. The purified inhibitor, which stoichiometrically inhibits bovine trypsin in the molar ratio 1:1, is stable over the pH range 3-11 at ambient temperatures. Only a slight decrease in inhibitory activity occurs down to pH 2, but a sharper decrease occurs at pH values above 11. The inhibitor is stable to heat up to 60 degrees C, but at higher temperatures (60-90 degrees C) it is more stable at pH than at pH 5.5 or pH 8.0. Trypsin inhibitor 2 retains its inhibitory activity in 8 M urea at pH 8.0, but is more susceptible to 8 M urea at pH 4.0. The stronger denaturant 6 M guanidine hydrochloride, however, abolishes the inhibitory activity at both pH 4.0 and pH 8.0. The inhibitor was not inactivated in 0.14 M beta-mercaptoethanol at either pH; however, reduction in the presence of 8 M urea or 6 M guanidine hydrochloride results in a loss of inhibitory activity. Circular dichroism and optical rotatory dispersion studies indicate that the inhibitor structure is characterized by beta-sheet and unordered forms and the absence of alpha-helix. The positive CD band centered at 227 nm has been used to follow conformation change as a function of temperature. In line with the stability studies, the inhibitor conformation was thermally most stable at pH 3.0 and changed increasingly as the pH was raised. This band showed little change at neutral pH up to 8 M guanidine hydrochloride. Tyrosine titration in aqueous solution indicates that 1 or 2 of the 11 tyrosines are difficult to titrate even at pH 13. A more normal titration curve is obtained in 6 M guanidine hydrochloride, although at least one tyrosine side-chain appears to be buried in the protein interior and resists complete titration at pH values in excess of 12. These data show that this inhibitor has a high degree of stability, typical of other known protein proteinase inhibitors.
    Keywords: Seeds -- Analysis ; Trypsin Inhibitors -- Isolation & Purification
    ISSN: 0006-3002
    Source: MEDLINE/PubMed (U.S. National Library of Medicine)
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  • 7
    Language: English
    In: Psychiatry Research, 1984, Vol.11(3), pp.205-209
    Description: Platelet monoamine oxidase activity (MAO) was determined in 39 unmedicated chronic schizophrenic patients and 88 normal control subjects. Platelet MAO activity did not distinguish paranoid from nonparanoid patients or patients who met Taylor and Abrams criteria for narrowly defined schizophrenia from other schizophrenics. Enzyme activity was not related to either prognostic scores or age at onset of illness. MAO activity was decreased in patients compared to controls, and was lower in males than in females. Our findings indicate that clinical phenomenology, as defined in the present study, is of limited use in identifying biological subtypes of schizophrenia with deviant platelet MAO activity.
    Keywords: Schizophrenia ; Platelet Monoamine Oxidase ; Clinical Phenomenology ; Medicine
    ISSN: 0165-1781
    E-ISSN: 1872-7123
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  • 8
    Language: Undetermined
    In: Journal für Betriebswirtschaft : management review quarterly, 1984, Vol.34(1), pp. 203-225,50
    ISSN: 03449327
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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  • 9
    Language: English
    In: The Annals of Regional Science, 1984, Vol.18(2), pp.1-10
    Description: This paper discusses the relative lack of the use of sociological and cultural variables in the basic conceptual models of regional science. It presents sociological and cultural additions to classic residential location and land value theory. The augmentation of the topographic physical models and theories of regional science by the explicit introduction of social geography would permit improved land use decisions to be made. Survev or market research techniques are frequently required to identify the key links between the externally observable demographic characteristics of a group and the consumer preferences and behavior information needed to estimate the group's location-specific bidrent function.
    Keywords: Public Administration ; Education ; Constitution ; Theory ; Sociology ; Housing ; Culture ; Article;
    ISSN: 0570-1864
    E-ISSN: 1432-0592
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  • 10
    Language: English
    In: Economic Papers: A journal of applied economics and policy, 06/1984, Vol.3(2), pp.40-50
    ISSN: 08120439
    E-ISSN: 17593441
    Source: Wiley (via CrossRef)
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