نتایج جستجو برای None

تعداد نتایج: 225146  

Journal: :The Journal of General Physiology 1961
R. Werman, H. Grundfest,

Graded electrically excited responsiveness of Romalea muscle fibers is converted to all-or-none activity by Ba(++), Sr(++), or Ca(++), the two former being much the more effective in this action. The change occurs with as little as 7 to 10 per cent of Na(+) substituted by Ba(++). The spikes now produced have overshoots and may be extremely prolonged, lasting many seconds. During the spike the m...

1963
Edward J. Crothers,

Several alternative interpretations of all-or~none processes for paired-associate learning and concept formation are examined. These models, along with a simple incremental process, are compared to data obtained in three-response and four-response paired-associate learning experiments. The results strongly favor a two~process model that postulates a distinction between long-term and short-term ...

2015
Lars Strother, Kyle W. Killebrew, Gideon P. Caplovitz,

Curvature is a highly informative visual cue for shape perception and object recognition. We introduce a novel illusion-the Lemon Illusion-in which subtle illusory curvature is perceived along contour regions that are devoid of physical curvature. We offer several perceptual demonstrations and observations that lead us to conclude that the Lemon Illusion is an instance of a more general illusor...

Journal: :Genetics 1949
A Robertson, I M Lerner,

N E of the fundamental steps in any analysis of the inheritance of quan0 titative characters is the partitioning of the total phenotypic variance of the trait under study into it; genetic and environmental portions. The various techniques for this purpose for characters showing continuous or graded types of variation are well known (see WHATLEY 1942). They are based on methods of variance and c...

Journal: :Development 1990
T S Musci, R J Mullen,

Mouse embryos homozygous for the mutant gene Loop-tail (Lp) are characterized by craniorachischisis, an open neural tube extending from the midbrain to the tail. In the present study, experimental chimeric mice containing mixtures of genetically mutant (from Lp/+ x Lp/+ matings) and genetically normal cells were produced. Our aim was to determine whether a 'rescue,' phenotypic gradient, or inte...

Journal: :Child welfare 1998
M Weissman, C M LaRue,

The Center for Community Alternatives (CCA) operates an array of programs that primarily serve students whose parents are incarcerated. The authors explore outreach and programmatic approaches and discuss the benefits of a holistic, multifaceted, open approach to identifying, assessing, and meeting the needs of adolescent children of incarcerated parents. The article concludes with policy recom...

Journal: :Artif. Intell. 1975
Herbert A. Simon, Joseph B. Kadane,

Optimal algorithms are derived for safisficing problem-solving search, that is, search where the goal is to reach any. solution, no distinction being made among differ-ent solutions. This task is quite different from search for best solutions or shortest path solutions. L:onstraints mav be placed on the order in which sittes may be searched. This paper treats salisficing searches through partia...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1998
C C Petersen, R C Malenka, R A Nicoll, J J Hopfield,

The molecular mechanisms underlying long-term potentiation in the hippocampus have received much attention because of the likely functional importance of synaptic plasticity for information storage and the development of neuronal connectivity. Surprisingly, it remains unclear whether activity modifies the strength of individual synapses in a digital (all-or-none) or analog (graded) manner. Here...

Journal: :Journal of medical ethics 1995
C J Ryan, G de Moore, M Patfield,

Is there ever any reason for a doctor to lie to a patient? In this paper, we critically review the literature on lying to patients and challenge the common notion that while lying is unacceptable, a related entity--'benevolent deception' is defensible. Further, we outline a rare circumstance when treating psychotic patients where lying to the patient is justified. This circumstance is illustrat...

1998

INTERFERENCES: Larger than respirable particles (over 10 μm) have been found in some cases by microscopic analysis of cyclone filters. Over-sized particles in the sample are known to be caused by inverting the cyclone assembly. Heavy dust loadings, fibers, and water-saturated dusts also interfere with the cyclone's size-selective properties. The use of cond uctive samplers is recommended to min...

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