We report on Green Bank Telescope observations of interstellar scintillation from the pulsar B0450−18 at 340 and 825 MHz, revealing prominent arcs in secondary spectra both frequencies. The are successfully modeled by one-dimensional angular brightness distributions, estimated two independent techniques. distributions do not follow expected shape for a Kolmogorov plasma density spectrum, their ...

A clonal, myoepithelial-like cell line has been obtained from a primary culture established from the mammary gland of a 7-d-old rat. In a number of respects, this cell line, termed Rama 401, resembles the myoepithelial cells of the mammary gland, especially when grown on floating collagen gels. The cells grow as multilayers on the gel surface and form branching structures that do not appear to ...

Actomyosin stress fibers impinge on the nucleus and can exert compressive forces on it. These compressive forces have been proposed to elongate nuclei in fibroblasts, and lead to abnormally shaped nuclei in cancer cells. In these models, the elongated or flattened nuclear shape is proposed to store elastic energy. However, we found that deformed shapes of nuclei are unchanged even after removal...

Context. The youngest protostars that power energetic outflows are surrounded by infalling and rotating envelopes that contain most of the mass of the system. Aims. To study the properties and kinematics of the protostellar envelope surrounding the embedded source IRAS 05173−0555 in L1634. Methods. We carried out VLA ammonia observations at 1.3 cm with the VLA in the D configuration to map the ...

Application of dimethyl sulfoxide to proliferating L8 myoblasts (an established cell line of rat skeletal muscle) for 72 hr completely prevented fusion and induction of creatine phosphokinase (EC 2.7.3.2) activity (an indicator of muscle differentiation). The growth pattern changed from the usual sheets of randomly oriented cells to flattened, whorled monolayers of elongated fibroblast-like cel...

We perform Monte Carlo computer simulations of nematic drops in equilibrium with their vapor using a Gay-Berne interaction between the rod-like molecules. To generate the drops, we initially perform NPT simulations close to the nematic-vapor coexistence region, allow the system to equilibrate and subsequently induce a sudden volume expansion, followed with NVT simulations. The resultant drops c...

We report the observation of structural reorganizations associated with unique, stress-assisted gating of mechanosensitive (MscL) membrane protein on a silicon surface modified with alkyl-terminated monolayers. We observed that the shape of MscL membrane proteins changed dramatically depending upon the packing density of alkyl tails and the surface tension of the supporting organic layer. High-...

The diffusion equation has been solved numerically for the non steady-state problem of a two-dimensional, biphasic stratum corneum membrane. A brickand-mortar geometry was used, having variable relative phase permeability, corneocyte arrangement and corneocyte/lipid phase partition coefficient. The dependence of the diffusional pathway and the overall barrier function is shown to depend on thes...

We present 1300μmmaps of regions centered on the energy sources of 20 HH objects in order to study the distribution of circumstellar matter around these young stellar objects. The data show that the emission generally originates from a rather compact region which is embedded in a more diffuse environment. The relative contribution of the compact component to the total emission varies from 15 to...

We report experimental observations of the mechanical effects of light on ellipsoidal micrometre-sized dielectric particles, in water as the continuous medium. The particles, made of polystyrene, have shapes varying between near disk-like (aspect ratio k = 0.2) to very elongated needle-like (k = 8). Rather than the very tightly focused beam geometry of optical tweezers, we use a moderately focu...