Search Results - (Author, Cooperation:A. K. Lee)

2014-08-16

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Action Potentials ; Animals ; Brain Mapping ; CA1 Region, Hippocampal/cytology/*physiology ; Electrodes, Implanted ; Exploratory Behavior ; Male ; Maze Learning ; Memory/physiology ; Orientation ; Poisson Distribution ; Pyramidal Cells/*physiology ; Rats ; Rats, Long-Evans ; *Space Perception

2012-08-21

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; CA1 Region, Hippocampal/cytology/*physiology ; *Excitatory Postsynaptic Potentials ; *Memory ; Pyramidal Cells/*physiology ; Rats ; *Spatial Behavior ; Synapses/*physiology

2011-11-05

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Acetobacter/genetics/*physiology ; Animals ; Body Size/genetics ; Carbohydrate Dehydrogenases/*metabolism ; Drosophila/growth & development/*microbiology ; Female ; Homeostasis ; Insulin/*metabolism ; Intestines/microbiology ; Metagenome/*physiology ; *Signal Transduction ; Somatomedins/metabolism

2018-03-21

BMJ Publishing Group

0021-9746

1472-4146

Medicine

Diagnostics, Open access

1471-0528

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Materno-fetal transmission of hepatitis B was studied in 97 healthy carriers of hepatitis B surface antigen (HBsAg). Antepartum transmission occurred in at least 10 per cent. Intrapartum transmission may have occurred in about 40 per cent as a result of swallowing of the infective fluid by the baby during delivery, and materno-fetal transfusion during labour. Person to person transmission after delivery played a minor role. The presence of hepatitis B associated e antigen (HBeAg) in 48 per cent of maternal serum correlated strongly with the subsequent presence of antigen in the infants. There was a linear association between the incidence of antigens in cord blood and the duration of the first stage of labour, with a significant association when labour exceeded nine hours. Caesarean section is recommended if mothers have HBeAg; likewise amniocentesis and breast feeding should be discouraged if mothers have HBeAg.

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] In the vast majority of brain areas, the firing rates of neurons, averaged over several hundred milliseconds to several seconds, can be strongly modulated by, and provide accurate information about, properties of their inputs. This is referred to as the rate code. However, the biophysical laws ...

Electronic Resource

1432-1920

Ectopic pituitary adenoma ; Magnetic resonance imaging ; Sphenoid sinus

Springer Online Journal Archives 1860-2000

Medicine

Abstract MR images of an ectopic pituitary adenoma have been published in only a single case, a suprasellar mass. We present a patient with Cushing's disease in whom MRI revealed a pituitary adenoma within the sphenoid sinus. Radiologic characteristics of ectopic pituitary adenomas are reviewed, with emphasis on MRI, which demonstrates a soft tissue mass, isointense with gray matter on T1-weighted images, which enhances in a heterogeneous manner.

Electronic Resource

1432-1793

Springer Online Journal Archives 1860-2000

Biology

Abstract The pedal retractor muscle of Nassarius coronatus, unlike most mollusc muscles, contains high activities of both octopine dehydrogenase (159 IU g-1 wet wt muscle) and D-lactate dehydrogenase (40 IU g-1 wet wt muscle). Pedal retractor muscles show accumulation of octopine (increase of 4.7 μmol g-1 wet wt muscle), and a fall in arginine phosphate concentration (decrease of 4.1 μmol g-1 wet wt musscle) after exercise. During recovery from exercise, octopine returns to resting levels after about 120 min, D-lactate accumulates (5.1 μmol g-1 wet wt muscle), and arginine phosphate returns to resting levels within 30 min. D-lactate (2.0 μmol g-1 wet wt muscle) accumulates during long-term exposure to air. The results show that octopine dehydrogenase and D-lactate dehydrogenase can function to catalyze the terminal step of glycolysis during muscle anoxia associated with these different physiological states.

Electronic Resource

1432-136X

Springer Online Journal Archives 1860-2000

Biology

Medicine

Summary Oxygen consumption rates ( $$\dot V_{{\text{O}}_2 } $$ ) and a number of possible anaerobic end products were determined forLimaria fragilis at rest, and following active swimming. $$\dot V_{{\text{O}}_2 } $$ increased up to 8-fold (=4) during swimming. Swimming did not change the concentrations ofl-lactate, alanine or arginine phosphate in the single striated fast adductor muscle. Octopine, succinate andd-lactate were not detected in the adductor muscles of resting or active animals (〈0.2 μmoles/g wet weight). It is concluded that the slow sustained swimming displayed byLimaria utilises predominantly aerobic mechanisms of ATP production.

Electronic Resource

0360-6376

Physics ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

Mass spectra of linear copolymers of ethylene and propylene oxides show features which are characteristic of the two monomers. Interpretation of the spectra of samples with and without modified end groups allows them to be classified as either random or blocked in structure and, in the latter case, permits determination of the order in which blocks are incorporated. Within a limited molecular weight range, the method can lead to a full determination of the distribution of molecular weights in the samples.

9 Ill.

Electronic Resource

0360-6376

Physics ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

Molecular-weight distributions derived from mass spectrometric studies of some alkylene oxide copolymers have been used to calculate rate constant ratios for the first eight steps in the polymerization process. Results suggest that there is a significant reduction in reactivity of the growing chains during this initial period.

4 Ill.

Electronic Resource

0449-296X

Physics ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

The techniques of mass spectrometry have been applied to the copolymer from tri-fluoronitrosomethane (CF3NO) and tetrafluoroethylene (C2F4). The copolymer yields spectra of a repetitive nature, typical of the repeating units in the polymer chain. Molecules with masses up to m/e 6400 can be distilled from the unfractionated polymer which is stable up to 220°C. Interpretation of the mass spectrum suggests a linear structure for the regular polymer.

5 Ill.

Electronic Resource

0449-296X

Physics ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

Mass spectra of the volatile fractions from polyperfluorobut-2-yne have been obtained. The polymer appears to be thermally stable up to 300°C and molecules containing up to 12 monomer units have been identified. A regular structure is indicated by the mass spectrum which is characterized by unusually intense doubly charged ions. The endgroups are readily identified, and a conjugated polyolefin structure is indicated.

2 Ill.

Electronic Resource