Search

We demonstrate an on-wafer liquid crystal phase shifter which has a tunable 0-300°/cm phase shift at 110 GHz. The results show no dispersion over the entire frequency range indicating a tunable 'true time delay' of up to 2.5 ps/cm at all frequencies. The inherent losses in the liquid crystal are small, less than 1 dB/cm over the range of 1-110 GHz. The full tunability is achieved using small voltages, close to 10 V. We anticipate that one could achieve a phase shift of 600°/cm at 220 GHz. [ABSTRACT FROM AUTHOR]

We explore a new geometry allowing effective excitation of the lowest antisymmetric standing spin wave mode in ferromagnetic metallic films with symmetrical boundary conditions. The approach is based on the use of a coplanar waveguide with the ferromagnetic film, Permalloy (Py), playing the role of the signal line. In addition, we study a signal line which is a sandwich of Py inside two nonmagnetic metallic films. We find that the thickness and conductivity of the metal films can significantly alter the amount of absorption, at ferromagnetic resonance, between the symmetric and antisymmetric spin wave modes. The experimental results are supported by numerical calculations indicating the origin of the strength of the absorption. [ABSTRACT FROM AUTHOR]

Providing patients with the basic information they need to reduce their caloric intake and increase activity levels may not be as challenging as doing a complex diagnostic work-up or performing an intricate surgical procedure. But the clinical results can be just as rewarding. [ABSTRACT FROM AUTHOR]

OBJECTIVE: To determine the relationship between two common apoA-IV variants (Thr347→Ser; Gln360→His), and body mass index (BMI) and percentage body fat. DESIGN: Cross-sectional study. SUBJECTS: Eight-hundred and forty-eight subjects screened for participation in ongoing clinical studies. MEASUREMENTS: ApoA-IV genotype, body mass index, waist-to-hip ratio and percentage body fat by bioelectric impedance. RESULTS: Participants had an average age of 41±12 y and an average BMI of 28.2±5.5 kg/m2. Individuals homozygous for the Ser347 allele had higher BMI (32.3±6.6 vs 28.6±5.3 kg/m2; P<0.01) and percentage body fat (36.9±7.8 vs 31.0±9.6%; P<0.05) compared with individuals homozygous for Thr347. In contrast, the presence of at least one copy of the His360 allele was associated with lower BMI (27.2±5.0 vs 28.4±5.6 kg/m2; P<0.05) and percentage body fat (28.6±8.2 vs 30.7±9.1%; P<0.05). The genotype effects persisted after normalization of the data for the potential confounding effects of gender, age and race. When grouped by BMI percentile, the frequency of the Ser347/Ser347 genotype increased while the frequency of the His360 allele decreased with increasing BMI. CONCLUSIONS: These data suggest a role for apoA-IV in fat storage or mobilization and that genetic variations in the apoA-IV gene may play a role in the development of obesity. International Journal of Obesity (2000) 24, 945–953 [ABSTRACT FROM AUTHOR]

Using mouse spleen cells, before and after treatment with glutaraldehyde or mild hyperthermia, we observe a strong correlation between permeability to fluorescein and susceptibility to staining with N epsilon-dansyl-L-lysine (irrespective of the cells' ability to exclude trypan blue). We observe the same correlation using liposomes prepared from phosphatidylcholine and varying amounts of cholesterol. We have recently introduced N epsilon-dansyl-L-lysine as a fluorescent membrane stain, or "probe," whose uptake, we propose, is selective for phospholipid domains in membranes (G.M.K. Humphries & J.P. Lovejoy Biophys. J. 42:307-310, 1983; G.M.K. Humphries & J.P. Lovejoy J. Membrane Biol. 77:115-122, 1984). The results presented here are consistent with the hypothesis that the presence or absence of phospholipid domains in membranes also modifies their permeability toward fluorescein, and suggests that permeability towards other chemical species may be similarly affected. On the basis of work using liposomes, we believe this to be the case for carboxyfluorescein and for glucose. [ABSTRACT FROM AUTHOR]

Reports on the habitual low intake of fiber together with high intake of dietary fat. Correlation with diminished insulin sensitivity in lean and obese subjects who are otherwise healthy.