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Showing 25 to 36 of 930 entries
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Temporal response of a random medium from third-order laser speckle frequency correlations.

Physical review letters

Webster MA, Webb KJ, Weiner AM.
PMID: 11801058
Phys Rev Lett. 2002 Jan 21;88(3):033901. doi: 10.1103/PhysRevLett.88.033901. Epub 2002 Jan 02.

We demonstrate for the first time that the temporal response of a random medium can be obtained from optical intensity fluctuations. Our method uses third-order intensity correlations of measured speckle patterns from a multiple scattering random medium as a...

Latent inhibition is disrupted by acute and repeated administration of corticosterone.

The international journal of neuropsychopharmacology

Shalev U, Feldon J, Weiner I.
PMID: 11281953
Int J Neuropsychopharmacol. 1998 Dec;1(2):103-113. doi: 10.1017/S1461145798001163.

Latent inhibition (LI), namely, a retardation in conditioning to a stimulus, as a consequence of its prior non- reinforced pre-exposure, is disrupted in amphetamine-treated rats and humans and in some subsets of schizophrenic patients. One factor that has been...

Antibodies That Distinguish between the Serine-158 Phospho- and Dephospho-Form of Spinach Leaf Sucrose-Phosphate Synthase.

Plant physiology

Weiner H.
PMID: 12228466
Plant Physiol. 1995 May;108(1):219-225. doi: 10.1104/pp.108.1.219.

Serum antibodies were raised against a synthetic peptide corresponding to the amino acid sequence surrounding the major inactivating phosphorylation site (serine-158) of spinach (Spinacia oleracea) leaf sucrose-phosphate synthase (SPS). The anti-peptide antibodies precipitated highly activated SPS preferentially to ATP-inactivated...

Generalized grating equation for virtually-imaged phased-array spectral dispersers.

Applied optics

Vega A, Weiner AM, Lin C.
PMID: 12856727
Appl Opt. 2003 Jul 10;42(20):4152-5. doi: 10.1364/ao.42.004152.

The virtually-imaged phased array (VIPA) is a side-entrance etalon with potential application as a high-resolution spectral disperser for wavelength division multiplexing. Here we present an approximate analytical spectral dispersion law for the VIPA, which we confirm experimentally.

Origin of antimony segregation in GaInSb/InAs strained-layer superlattices.

Physical review letters

Steinshnider J, Harper J, Weimer M, Lin CH, Pei SS, Chow DH.
PMID: 11082596
Phys Rev Lett. 2000 Nov 20;85(21):4562-5. doi: 10.1103/PhysRevLett.85.4562.

We show how cross-sectional scanning tunneling microscopy may be used to reconstruct the Sb segregation profiles in GaInSb /InAs strained-layer superlattices. These profiles are accurately described by a one-dimensional model parametrizing the spatial evolution of an Sb seed at...

Fast wavelength-parallel polarimeter for broadband optical networks.

Optics letters

Wang SX, Weiner AM.
PMID: 15143628
Opt Lett. 2004 May 01;29(9):923-5. doi: 10.1364/ol.29.000923.

We describe a novel wavelength-parallel polarimeter operating in the light-wave band that measures the complete state of polarization of 256 wavelengths in parallel within 20 ms (software-limited), with the potential for submillisecond operation. By use of fast switching ferroelectric...

A closer look into DESIRE for NMR microscopy.

Journal of magnetic resonance (San Diego, Calif. : 1997)

Weiger M, Zeng Y, Fey M.
PMID: 17983786
J Magn Reson. 2008 Jan;190(1):95-104. doi: 10.1016/j.jmr.2007.10.003. Epub 2007 Oct 12.

The major challenge of nuclear magnetic resonance (NMR) microscopy at a spatial resolution of a few micrometers is to obtain a sufficiently high signal-to-noise-ratio (SNR) within a reasonable measurement time. As a particular difficulty, molecular self-diffusion poses a serious...

Single-atom contact mechanics: from atomic scale energy barrier to mechanical relaxation hysteresis.

Physical review letters

Schirmeisen A, Weiner D, Fuchs H.
PMID: 17026048
Phys Rev Lett. 2006 Sep 29;97(13):136101. doi: 10.1103/PhysRevLett.97.136101. Epub 2006 Sep 25.

The potential energy landscape of surfaces governs the dynamics of adsorbed molecules, as well as atomic scale friction processes. We measure the potential energy landscape of a single-atom tip interacting with a vicinal nonconducting NaCl(100) surface in real space...

Interferometry from a scattering medium.

Optics letters

Wang Z, Weiner AM, Webb KJ.
PMID: 17632627
Opt Lett. 2007 Jul 15;32(14):2013-5. doi: 10.1364/ol.32.002013.

A two-beam random interferometer is demonstrated where coupling is facilitated by a scattering medium. A modulation observed in the normalized second-order intensity frequency correlation of the transmitted light is attributed to the relative temporal delay of the two beams...

Caregiving burden responses differ for Internet and telephone data collection.

AMIA ... Annual Symposium proceedings. AMIA Symposium

Segal M, Weiner M.
PMID: 17238707
AMIA Annu Symp Proc. 2006;1088.

We compared data collected by internet and by telephone from chronic patients' family members about the experience of caregiving. We used a within-subject design, and dual administration of scales including caregiving burden, caregiver social support, depression, and locus of...

Identification of factors regulating the phosphorylation status of sucrose-phosphate synthase in vivo.

Plant physiology

Weiner H, McMichael RW, Huber SC.
PMID: 16669055
Plant Physiol. 1992 Aug;99(4):1435-42. doi: 10.1104/pp.99.4.1435.

The purpose of this study was to identify the factors that control sucrose-phosphate synthase (SPS)-kinase and SPS-protein phosphatase (SPS-PP) activity in situ, and thereby mediate the activation of SPS by light or mannose. Feeding mannose to excised spinach (Spinacia...

Broadband all-order polarization mode dispersion compensation via wavelength-by-wavelength Jones matrix correction.

Optics letters

Miao H, Weiner AM, Mirkin L, Miller PJ.
PMID: 17700785
Opt Lett. 2007 Aug 15;32(16):2360-2. doi: 10.1364/ol.32.002360.

We demonstrate wideband all-order polarization mode dispersion (PMD) compensation by applying high-speed spectral polarization sensing and ultrafast pulse shaping techniques to characterize and correct the frequency-dependent Jones matrix associated with PMD of optical fibers on a wavelength-by-wavelength basis. We...

Showing 25 to 36 of 930 entries