Low irra(liances of 254 nm UV photoreversibly interfere with the capacity of plant cells properly to tutilize auixin for cell division, enlargement and (lifferentiationi (3,8,17). This UV-induced auixinrecalcitrance does not seem to be caused by activation of aulxin oxidase or by alteration of auxin metal)olism, penetration, or translocation. In view of the role of nucleic acid and protein meta...

During the process of myelination of axons by oligodendrocytes (OLGs) in the central nervous system, myelin-specific proteins and lipids are sorted and transported from their site of synthesis, the OLG cell body, to their site of destination, the myelin sheath. Insight into the mechanism of these events is crucial for the development of therapeutic approaches in devastating demyelinating diseas...

BACKGROUND Tungsten carbide nanoparticles are being explored for their use in the manufacture of hard metals. To develop nanoparticles for broad applications, potential risks to human health and the environment should be evaluated and taken into consideration. OBJECTIVE We aimed to assess the toxicity of well-characterized tungsten carbide (WC) and cobalt-doped tungsten carbide (WC-Co) nanopa...

In a letter to the Editor of Science (176, 966, 1972), Professor Szent-Gyorgyi described his approach to science as Dionysian. This little book provides some further insight into the meaning of this statement. In 114 pp. he writes about some of his research interests over the past half century. This account does not describe the work in much experimental detail, but rather tries to give the mot...

Ti the ditor: Thle articlc otf Stanton A. Glantz on hliostatistics' as the first paper ofa new decadc appeared alt thc right timle. Voo many investigators iiiisulsc tlie statistics aiid hence support erroneous concltisions. xxonder w h\ the author did not include a vers sinmple, eas -torecogni.'e hut of'teni fOund mistake, even in Circulaion The figuire 4 in the articie oF C rawtford et al.2 in...

Rapid changes in the transpiration rate from a leaf or leafy shoot as a result of excision of that leaf or shoot have been observed in many plants bv many investigators (1, 2, 5, 7, 10, 11, 12, 13, 16). In banana plants, both photosynthesis and transpiration have been found to change rapidly following excision of the leaf (7). The mechanism underlying such rapid changes in transpiration has bee...

Proofs of classical Chernoo-Hoeeding bounds has been used to obtain polynomial-time implementations of Spencer's derandomization method of conditional probabilities on usual-nite machine models: given m events whose complements are large deviations corresponding to weighted sums of n mutually independent Bernoulli trials, Raghavan's lattice approximation algorithm constructs for 0 ? 1 weights a...

Sinice Kogl. Haagen-Sniit aid(I Erxlel)en (10) first reported oni the growth stimulatory properties of IAA., manv sttldies hlave l)een devoted to tracinig its rotute of biosynithesis. In 1940. Skoog alnd Thimanni (20) recognlize(d that tryp)tophan in structtural protein col(Il be converted to IAA in the preselice of proteolytic enzym-es. Sinice theln a zinumber of investigationis (6. 13. 24) ha...

The genus Ctenus Walckenaer 1805 was recently revised by Jäger (2012) for Laos and neighbouring countries. He followed the broader definition of the genus by Steyn et al. (1997) and recorded five species from Laos, three of which were described as new (Jäger 2012). In May 2012 one male of the genus Ctenus was collected in the Khammouan Province, Laos. It belongs to an undescribed species, which...