The lateral movement of auixin has been stuidied with bioassays and also by application of '4C-IAA. Both techniqutes have demonstrated that the tupper hal,f of a horizontally positioned stem or root contains at least 30 to 45 % of the total auxin present in the tissuie (2). However, such an auxin gradient is difficult to reconcile with the Cholodny-WVent theory of root geotropism becatuse it is...

Suppletion is where the word-forms of the same lexeme have phonologically distinct stems. A study of thirty languages shows it to be surprisingly widespread, suggesting resistance to the pressure of paradigmatic levelling. While a major factor in its preservation appears to be the high frequency of the items that display it, two other factors are in operation, the type of inflectional category ...

The term "bound auxin" is herein used to describe auxin conjugates insoluble in organic solvents which dissolve indoleacetic acid (IAA) and its derivatives, but hydrolyzable by NaOH to release IAA. Bound auxin from pea stems was fractionated into water-soluble, water-insoluble/NaOH-hydrolyzable, and insoluble components. Formation of bound auxin commenced with 15 minutes of applying exogenous l...

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In this issue of Cell Stem Cell, Kokovay et al. uncover that VCAM1 expression in neural stem cells regulates adult neurogenesis. Cerebrospinal fluid-borne IL-1β upregulates VCAM1 expression, which in turn regulates the architecture of the stem cell niche, redox homeostasis, and neurogenesis.

Functional and structural characteristics of corticular photosynthesis of sun-exposed bark of olive tree (Olea europaea L.) were examined. Stomata are only sporadically present during stem primary growth. Light transmission through the phellem was age dependent, decreasing rapidly in stems older than five years of age. Light transmission was also low in pubescent 1-year-old stems. Light transmi...

We report the clinical and radiological outcome of 111 primary Taperloc hip arthroplasties implanted with Boneloc bone cement and the effect of stem size on survival. The mean follow-up was 5.3 years (range 3.2-6.6 years). The average age of the patients at operation was 73.4 years. Twenty-seven were male and 84 female. We defined clinical failures as those who had revision for aseptic loosenin...