17 Result(s)

Article

Diagnostic capabilities of fractal dimension and mandibular cortical width to identify men and women with decreased bone mineral density

Dental panoramic radiographs could be used to screen for osteopenia. We found the fractal dimension to be a good discriminator of osteopenia in both men and women but that the mandibular cortical width (MCW) d...

A. C. Alman, L. R. Johnson, D. C. Calverley, G. K. Grunwald… in Osteoporosis International (2012)

Article

Akt-mediated GSK-3β inhibition prevents migration of polyamine-depleted intestinal epithelial cells via Rac1

The rapid migration of intestinal epithelial cells (IEC) is important for the healing of mucosal wounds. We have previously shown that polyamine depletion inhibits migration of IEC-6 cells. Akt activation and ...

R. J. Vaidya, R. M. Ray, L. R. Johnson in Cellular and Molecular Life Sciences CMLS (2006)

Article

Individual and Joint Actions of Selenate and Methylmercury on the Development and Survival of Insect Detritivore Megaselia scalaris (Diptera: Phoridae)

Despite the important roles played by insects in most ecosystems, surprisingly little is known about how anthropogenic pollutants or their mixtures interact to affect insect populations. The independent and jo...

P. D. Jensen, L. R. Johnson, J. T. Trumble in Archives of Environmental Contamination an… (2006)

Article

Decreased apoptosis in polyamine depleted IEC-6 cells depends on Akt-mediated NF-κB activation but not GSK3β activity

The PI3-kinase/Akt pathway promotes cell survival in many different cell types including intestinal epithelial cells. Increased AKT activation in polyamine depleted intestinal epithelial cells correlated well ...

S. Bhattacharya, R. M. Ray, L. R. Johnson in Apoptosis (2005)

Article

Effects of Rock Damage on Seismic Waves Generated by Explosions

 — In studying the physical processes involved in the generation of seismic waves by explosions, it is important to understand what happens in the region of high stresses immediately surrounding the explosion....

L. R. Johnson, C. G. Sammis in pure and applied geophysics (2001)

Chapter

Effects of Rock Damage on Seismic Waves Generated by Explosions

In studying the physical processes involved in the generation of seismic waves by explosions, it is important to understand what happens in the region of high stresses immediately surrounding the explosion. Th...

L. R. Johnson, C. G. Sammis in Monitoring the Comprehensive Nuclear-Test-… (2001)

Article

Nonlinear Three-dimensional Inversion of Low-frequency Scattered Elastic Waves

—We investigate a new nonlinear inversion method for low frequencies to determine the bulk and shear modulus as well as the material density and the location of subsurface inhomogeneities. The solution is a di...

R. Gritto, V. A. Korneev, L. R. Johnson in pure and applied geophysics (1999)

Article

Urinary arsenic speciation and the assessment of UK dietary, environmental and occupational exposures to arsenic

J. G. Farmer, L. R. Johnson, M. A. Lovell in Environmental Geochemistry and Health (1989)

Article

Urinary arsenic concentrations and speciation in Cornwall residents

Inorganic arsenic and its methylated metabolites were determined in urine from adults and children in Cornwall and from corresponding control groups in Glasgow. In the mineralised south-west of England, where ...

L. R. Johnson, J. G. Farmer in Environmental Geochemistry and Health (1989)

Article

Isolated rat parietal cells: Comparison of binding and functional response to cholinergic drugs

R. Ecknauer, L. R. Johnson… in Fresenius' Zeitschrift für analytische Chemie (1980)

Chapter

Pharmacological Actions

During the past eight decades, histamine has, from time to time, been both invoked and challenged as a physiologic regulator of the cardiovascular system (Lewis, 1927; Dale, 1929a, b; Best and McHenry, 1931; Burn

B. Mauricio Altura, S. Halevy, L. R. Johnson in Histamine II and Anti-Histaminics (1978)

Article

Iron and manganese encrustations in Recent sediments

CORES taken from the north-eastern Mediterranean (Fig. 1) during cruise 4/72 of the RRV Shackleton, using a Lehigh 4-inch hydroplastic gravity corer, contain layered organic structures encrusted with either manga...

H. A. BUCKLEY, A. J. EASTON, L. R. JOHNSON in Nature (1974)

Article

Montmorillonite in surface detritus

QUANTITATIVELY, clay minerals are usually the most important components of those fractions of deep-sea sediments which are smaller than 2 µm. There are specific patterns in the distributions of the principal grou...

R. CHESTER, J. H. STONER, L. R. JOHNSON in Nature (1974)

Article

Uptake of Cobalt from Seawater by Aeolian Dust

UPTAKE onto the surfaces of detrital particles has been considered as a possible mechanism for the removal of trace elements from sea water^1,2. But Kharkar et al.³ have examined experimentally the adsorption of t...

S. ASTON, R. CHESTER, L. R. JOHNSON in Nature (1972)

Article

Trace Element Geochemistry of North Atlantic Aeolian Dusts

WIND-TRANSPORTED (aeolian) dusts make a significant contribution to the land-derived material of some deep-sea sediments^1–4 and this is particularly significant in the region of the North Atlantic between about 1...

R. CHESTER, L. R. JOHNSON in Nature (1971)

Article

Atmospheric Dusts collected off the West African Coast

IN recent years several studies^1–4 have revealed that wind-transported (eolian) dusts make a significant contribution to the land-derived material in some deep-sea sediments. This contribution depends, among othe...

R. CHESTER, L. R. JOHNSON in Nature (1971)