The interactions between charged alkylacrylamide gels of varying hydrophobicity and charge density and the oppositely charged surfactant hexadecyltrimethylammonium (C(16)TA(+)) have been investigated to determine the conditions necessary to induce excess surfactant binding (beyond charge neutralization) and resolubilization of the polymer-surfactant complex. In all cases, an initial gel collapse o

Caloplaca gyalectoides S. Kondratyuk & Karnefelt from the Cape Province, South Africa, and Caloplaca chilensis S. Kondratyuk, Karnefelt, Froden & Arup with an associated parasymbiont Arthonia tetraspora S. Kondratyuk & Karnefelt occurring mainly along the coast in central Chile are described as new. Possible associated taxa are briefly discussed. Distribution maps are provided for all

An amorphous, colorless, and highly transparent polymer containing boron atoms in its branched chain architecture was synthesised from boron trioxide, poly(ethylene glycol) (PEG) and methoxy end-capped PEG. Electrolytes based on this polymer and different concentrations of lithium perchlorate (LiClO4) were prepared and characterised by impedance spectroscopy, calorimetry and thermogravimetry. The

Erasure of data stored by use of photon echoes has been investigated as a function of data writing time and data storage time. The results clarify the requirements on laser phase and frequency stability for performing photon-echo data erasure. The analysis of phase and frequency stability of a light source by the photon-echo erasure process is illustrated. A theoretical analysis emphasizing the ph

The cytogenetic, hematologic, and clinical characteristics of a 13-year-old girl with acquired t(6;9)(p23;q34) and dysmyelopoietic syndrome developing into acute myelomonocytic leukemia are described, bringing the total number of patients with t(6;9) and hematologic disease described in the literature up to 19. The diagnosis has been acute myeloid leukemia in the great majority of these patients;

Oxygen consumption (FO2) and lactate production (Flac) were measured during spontaneous activity in the guinea-pig mesotubarium. During spontaneous contractions FO2 increased to maximally 0.270 +/- 0.025 mumol min-1g-1 (n = 23), followed by a rapid fall immediately upon relaxation. In the relaxed period (5-15 min) between spontaneous contractions FO2 continued to slowly decrease by about 25% towar

Background Earlier reports on reduced physical performance and osteoporosis-related fractures have mostly been short-term studies. The aim of this investigation was to examine the effects of fractures on physical functioning 3 years after trauma, the latter being stratified for pain. Participants and methods The study consisted of a population-based case-control study including 289 subjects from t

The pseudo-rapidity dependence of the elliptic flow at various excitation energies measured by the PHOBOS Collaboration in Au+Au collisions at RHIC is one of the surprising results that has not been explained before in terms of hydrodynamical models. Here we show that these data are in agreement with theoretical predictions based on perfect fluid hydrodynamics. We also show that these PHOBOS data

Polyamine analogues have demonstrated anti-tumour activity in a number of solid tumour models. In the present study we compared the cytotoxicities of three polyamine analogues against four breast cancer cell lines. All cell lines are derived from tumours of women with breast cancer and, although we are sampling just a small number of tumours, they represent a spectrum of the genetic plethora of br

A dual-pump, dual-broadband coherent anti-Stokes Raman scattering system for simultaneous measurements of temperature and concentrations of N-2, O-2, and CO2 in reacting flows is demonstrated. In this system pure rotational transitions of N-2-O-2 and rovibrational transitions of N-2-CO2 are probed simultaneously with two narrowband pump beams, a broadband pump beam, and a broadband Stokes beam. Th

A new DNA variant in the promoter region of the human cystatin C gene has been detected by direct sequencing. The base substitution generates a newDdeO restriction site, thus allowing the design of a rapid polymerase chain reaction assay for analysis of this polymorphism in the population.

The intangible nature of software means that traditional processes for managing product development are not sufficiently effective. This, in combination with the increasing share of software in technical products, has had the effect of making it difficult to identify improvement proposals for engineering processes in many cases. This thesis uses both qualitative and quantitative research methods t

The initial oxidation of Rh(100) has been studied using high resolution core level spectroscopy, low energy electron diffraction, surface x-ray diffraction, scanning tunneling microscopy, and density functional theory. We report a structural study of an oxygen induced structure displaying a c(8x2) periodicity at an oxygen pressure above 10(-5) mbar and using a sample temperature of 700 K. Our expe