Search Results - (Author, Cooperation:J. Barber)

2011-05-14

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Biomass ; *Electricity ; Electrolysis ; Hydrogen ; *Photosynthesis ; Plant Development ; Plants/metabolism ; *Solar Energy ; Sunlight ; Synthetic Biology

2015-08-01

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2018-09-13

Royal Society

2054-5703

Natural Sciences in General

biomaterials

1365-3040

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Abstract. A review is given of the organization and properties of thylakoid membrane proteins and lipids as a basis for understanding the factors which regulate the light reactions of photosynthesis. Particular emphasis is placed on the lateral organization of the major intrinsic multipeptide complexes and on the importance of diffusional processes in controlling the kinetics of electron transport and the distribution of light energy between photosystems 1 and 2.

Electronic Resource

2018-08-23

American Association for the Advancement of Science (AAAS)

2375-2548

Natural Sciences in General

2018-07-05

American Association for the Advancement of Science (AAAS)

2375-2548

Natural Sciences in General

2018-02-21

BMJ Publishing

2044-6055

Medicine

Open access, Mental health

2018-09-28

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Geosciences

Computer Science

Medicine

Natural Sciences in General

Physics

Anatomy, Morphology, Biomechanics, Ecology

1089-7550

AIP Digital Archive

Physics

The feasibility of a high-temperature superconducting switch based on the principle of the superconducting vector switch (SVS) is discussed. This switch exploits the anisotropy in electrical conductivities of the high-temperature superconductors. Underlying the SVS mechanism is the ability to turn on/off large superconducting currents confined to the CuO2 planes that characterize these materials using lower currents flowing normal to the planes. The required conditions to optimize the switch and increase the gain are presented.

Electronic Resource

1469-8986

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Psychology

Behavioral factors and cardiovascular changes associated with myocardial degeneration and cardiac arrest induced by shock avoidance stress were studied. Pairs of avoidance and yoked squirrel monkeys were exposed to a 24-hr session. Myocardial degeneration and cardiac arrest were more readily induced in avoidance than yoked monkeys. The cardiac lesions were not related to body weight, aggressive behavior, or number of shocks received during stress, but an increased heart rate without hypertension during the first stress hour was more evident in avoidance than yoked monkeys. These cardiac changes were attributed to an autonomic disturbance associated with the response contingencies of the avoidance situation. An autonomic effect also appeared to be involved with stress-induced death. These deaths were characterized by a sudden, severe bradycardia without initial hypotension and cardiac arrest which was attributed to either parasympathetic activation or sympathetic inhibition. While heart rate decreased in all monkeys, stress-induced death followed only in monkeys which gave up and stopped contending with the stress. Thus, stress-induced myocardial changes and death were related to autonomic disturbances precipitated by psychological stress.

Electronic Resource

1468-2494

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

The phase diagram water, phenethyl alcohol and laureth 4 was determined and the variation of the vapour pressure of the alcohol was determined during evaporation using gas chromatographic head-space analysis. The phase changes during evaporation were estimated from the phase diagram and compared to the appearance of the emulsion using optical microscopy. The transfer of the fragrance ingredient between different phases during the process was estimated and its measured vapour pressures compared to those calculated from values of earlier determination in different phases in the system. The agreement was good. On a elabore le diagramme de phase eau, alcool phenethylique et laureth 4 et on a determine la variation de la tension de vapeur de l'alcool durant l'evaporation en utilisant l'analyse par chromatographie gazeuse a injection directe en tete de colonne. Les changements de phase durant l'evaporation sont estimes a partir du diagramme de phase et compares a l'aspect de l'emulsion par microscopie optique. On a estime le transfert de l'ingredient parfume entre les differentes phases durant le processus et ses tensions de vapeur mesurees ont ete comparees a celles calculees a partir de valeurs determinees anterieurement dans differentes phases du systeme. La concordance est satisfaisante.

Electronic Resource

1469-8986

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Psychology

The influence of autonomic innervation on stress-induced cardiomyopathy and heart rate changes was analyzed by selective removal of parasympathetic and sympathetic myocardial inputs. Squirrel monkeys with bilateral cervical vagotomy or β-adrenergic receptors blocked by propranolol were studied in shock stress and restraint situations. Because propranolol reduced stress-induced lesions and tachycardia, enhanced sympathetic β-receptor activity was considered responsible for these effects in intact monkeys. No role for increased parasympathetic activity in myocardial pathology was indicated. Enhanced sympathetic activity was also implicated by lesions and tachycardia of vagotomy monkeys. However, vagotomy alone induced myocardial pathology and confounded the effects of shock stress. Stress-induced cardiac arrest in both vagotomy and propranolol monkeys was observed. An imbalance of either autonomic input was suggested to be responsible for this dysfunction. Thus, autonomic innervation was involved in stress-induced cardiomyopathy and heart rate changes.

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Expression of proto-oncogene fos is induced in response to a variety of growth factors and differentiation-specific agents. However, the induction of fos gene expression is not influenced by inhibition of protein synthesis. We, therefore, entertained the notion that expression of the fos gene may be governed by posttranslational modification of cellular transcriptional factors. We report here that transcription of the human c-fos gene is modulated by negatively and positively acting cellular factors.The nuclear protein products of the resident oncogene of the FBJ-murine osteosar-coma virus (v-fos) and its corresponding cellular proto-oncogene (c-fos) are stoichiometrically phosphorylated on serine and threonine residues. The c-fos protein is more highly phosphorylated than the v-fos protein due to the phosphorylation of unique sites tentatively localized to the c-terminal 20 amino acid residues. The protein kinase C agonist, TPA, stimulates phosphorylation of the c-fos, but not the v-fos protein.

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Electronic Resource

1365-2044

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-3040

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Abstract. The structure of chloroplast membrane proteins and their organization into photosynthetically-active multimeric complexes is described. Extensive use has been made of information derived from gene sequencing and other biochemical studies to predict likely protein conformations. These predictions have been assimilated into structural models of the various thylakoid complexes. The enzymatic activities of the complexes have also been described and where possible related to individual polypeptides.

Electronic Resource

1365-2222

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Sixty-three patients completed a double-blind placebo-controlled study of oral oxatomide (30 mg t.d.s.) in the management of seasonal allergic rhinitis and/or conjunctivitis. Hay fever symptom scores were significantly lower for oxatomide-treated patients than for the placebo group on the majority of days during periods of high pollen counts. Moreover, on days when pollen counts were 10/m3 or more, a statistically significant positive correlation between symptom score and pollen count was demonstrated for the placebo group but not for the oxatomide group. Oxatomide also appeared to be superior to placebo in terms of patients' requirements for supplementary mepyramine (Anthisan) tablets, and the doctor's global assessment. Side-effects were reported by four patients in the oxatomide group and by three receiving placebo.

Electronic Resource

1399-3054

Blackwell Publishing Journal Backfiles 1879-2005

Biology

The uptake and distribution of inorganic mercury (HgCl2) within higher plants (Pisum sativum and Mentha spicata) was examined using solution culture and radiotracer techniques. Plants were found to tolerate an external level of 1 mgHg/kg of solution but both physiological and biochemical processes were affected at 5 mgHg/kg and 10 mgHg/kg. The uptake of Hg into plants grown in hydroponic solution was a function of external concentration. Over the concentration range considered the accumulation of Hg in the roots was linear on a log-log basis although the uptake of the element into the shoots appeared to be two-phased. The distribution of Hg in plants was asymmetrical with much greater amounts of the element in the roots than the shoots. Although the level of Hg increased generally in plant tissues with increasing external levels, the proportion retained in the roots, relative to the shoots, was constant (approximately 95%). Two binding characteristics of the Hg within plant tissue were detected. A major proportion of Hg was tightly bound, being unaffected by treatment with ethanol and hydrochloric acid. The remaining Hg in the tissue was removed by either water or hydrochloric acid treatment. Cell fractionation indicated that the major binding component of Hg in plant tissues was the cell wall.

Electronic Resource

0027-4380

Musicology

Briefly Noted

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] ACCORDING to an article by Moore and colleagues published in this issue of Nature (see p.630), one of the major obstacles to the development of an artificial photo-synthetic system has been overcome. For many years the goal of photochemists has been to provide an artificial system that mimics the ...

Electronic Resource