Search Results - (Author, Cooperation:A. Herman)

2018-01-30

Genetics Society of America (GSA)

0016-6731

Biology

2018-05-18

American Physical Society (APS)

0031-9007

1079-7114

Physics

Condensed Matter: Electronic Properties, etc.

2012-01-24

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Alginates/chemistry/*metabolism ; Bacterial Proteins/genetics/metabolism ; *Biofuels ; Biological Transport ; Biomass ; Carrier Proteins/genetics/metabolism ; Escherichia coli/*genetics/metabolism ; Ethanol/*metabolism ; Fermentation ; Genes, Bacterial ; Glucose/metabolism ; Glucuronic Acid/chemistry/metabolism ; Hexuronic Acids/chemistry/metabolism ; Lactic Acid/metabolism ; Mannitol/metabolism ; *Metabolic Engineering ; Metabolic Networks and Pathways ; Open Reading Frames ; Phaeophyta/*metabolism ; Polysaccharide-Lyases/genetics/metabolism ; Seaweed/*metabolism ; Vibrio/*enzymology/genetics

2012-04-03

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Adipocytes/metabolism ; Adipose Tissue/cytology/*metabolism/pathology ; Adiposity ; Animals ; Basic Helix-Loop-Helix Leucine Zipper Transcription ; Factors/chemistry/genetics/*metabolism ; Blood Glucose/metabolism ; Body Mass Index ; Body Weight ; Cells, Cultured ; Cohort Studies ; Cross-Sectional Studies ; Diabetes Mellitus/blood/genetics/metabolism ; Female ; Gene Expression Regulation/genetics ; Genotype ; Glucose/*metabolism/pharmacology ; Glucose Intolerance/genetics ; Glucose Transporter Type 4/biosynthesis/genetics/metabolism ; Homeostasis/genetics ; Humans ; Insulin/metabolism/pharmacology ; Insulin Resistance/genetics ; Lipogenesis ; Male ; Mice ; Mice, Knockout ; Molecular Sequence Data ; Nuclear Proteins/chemistry/deficiency/genetics/*metabolism ; Obesity/genetics/metabolism ; Promoter Regions, Genetic/genetics ; Protein Isoforms/chemistry/genetics/metabolism ; RNA, Messenger/genetics/metabolism ; Transcription Factors/chemistry/deficiency/genetics/*metabolism

2018-05-15

American Heart Association (AHA)

1524-4539

Medicine

Cardiovascular Disease, Epidemiology, Mental Health, Race and Ethnicity, Risk Factors

2018-10-27

The American Society for Pharmacology and Experimental Therapeutics (ASPET)

0026-895X

1521-0111

Chemistry and Pharmacology

Medicine

1471-0528

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1469-8986

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Psychology

The effects of stress on the affective content of dreams and on rapid-eye-movement (REM) period eye-movement activity and respiration were studied. The experiment was also designed to examine the similarity between walking and sleeping states in the respiratory correlates of emotion. Sleep records and dream reports were collected following the viewing of stress and neutral films. The stress films significantly increased dream anxiety and also increased REM-period respiratory irregularity among those Ss who, in the walking state, showed irregular breath patterns in response to stressful film scenes. Some evidence was also found that dream affect is related to RFM-period respiratory irregularity among the Ss who are walking responders. These data are interpreted as supporting the hypothesized congruence between the waking und dream states in The relationship between affect and breathing irregularity.

Electronic Resource

1471-0528

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Summary. Sixty-two patients with genuine stress incontinence (group A) and 30 women with combined detrusor instability and genuine stress incontinence (group B) had a colposuspension operation. The proportion with symptoms of detrusor instability was significantly reduced from 24% before operation to 9% after operation in group A and from 73% to 33% in group B. Urodynamically, detrusor instability developed after surgery in 17 of the 62 patients (27%) in group A whereas only 12 of the 30 women (40%) in group B had detrusor instability after surgery. No urodynamic explanation was found to explain the effect of colposuspension in relieving the symptoms of detrusor instability in some and causing them in others. Nevertheless, it is suggested that colposuspension is helpful for most patients with combined detrusor instability and genuine stress incontinence.

Electronic Resource

1471-0528

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

The association between pre-operative serum carcinoembryonic antigen (CEA) and liver scanning employing technetium (99mTc)-tin colloid was investigated in 30 women subsequently proven to have primary epithelial ovarian carcinoma to determine whether these two investigations improve the detection of hepatic mtastases. The uer limit of normal for CEA (≥ 5 ng/ml) did not represent the optimal levels for use in predicting ovarian carcinoma nor the presence of liver metastases. But with CEA levels〉 10 ng/ml sensitivity for liver metastases was 57%. Liver scanning alone demonstrated metastases in five out of seven patients (71%) with parenchymal liver metastases. The combination of CEA and liver scan was positive in six out of these seven patients (86%).

Electronic Resource

1469-8986

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Psychology

Some respiratory correlates of affect were examined by a computer partitioning of breath duration mid inspiration, expiration, and postexpiration pause components. Negative affects (primarily anxiety and hostility) were induced by showing stress films. The subjects' affects were assessed by a mood adjective checklist, and respiration by measures of thoracic and abdominal circumference during the viewing of stress and neutral films. No stress effect was observed on total breath time (respiration rate). However, expiration nines were longer and pause limes shorter during the stress than during the neutral 61ms. It is suggested that these changes may be due to increased tension in respiratory muscle groups. It was also found that breath times were longer during the first film viewed by the subjects than during then during subsequent films This pattern was observed when the subjects were cautiously attentive, and is attributed primarily to an increase in inspiration duration.

Electronic Resource

1077-3118

AIP Digital Archive

Physics

We demonstrate stable room-temperature electroluminescence (EL) at 1.54 μm from erbium-doped porous silicon devices under both forward- and reverse-bias conditions. Erbium was infiltrated in the pores (≤1019 cm−3) by cathodic electrochemical migration of the ions followed by high-temperature annealing (950–1100 °C) in an oxygen and nitrogen environment. The devices exhibit an exponential EL dependence in both bias conditions as a function of input power. In reverse bias, the external quantum efficiency reaches 0.01%. The EL intensity decreases by a factor of 24 for reverse bias and 2.6 for forward bias when the temperature increases from 240 to 300 K. The different device characteristics in forward and reverse biases suggest that different excitation mechanisms are responsible for EL. © 1999 American Institute of Physics.

Electronic Resource

1077-3118

AIP Digital Archive

Physics

We report tunable, narrow, directional, and enhanced erbium emission from one-dimensional photonic band gap structures. The structures are prepared by anodic etching of crystalline silicon and consist of two highly reflecting porous silicon Bragg reflectors sandwiching an active layer. The cavities are doped by cathodic electromigration of the erbium ions into the porous silicon matrix, followed by high temperature oxidation. By controlling the oxidation temperature of the structure, the position of the erbium emission near 1.5 μm is tuned to regions where the natural erbium spectrum is very weak. The erbium emission from the cavity is narrowed to a full width at half maximum of 12 nm with a quality factor Q of 130, highly directional with a 20° emission cone around the normal axis, and enhanced by more than one order of magnitude. © 2000 American Institute of Physics.

Electronic Resource

1750-3841

Blackwell Publishing Journal Backfiles 1879-2005

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Process Engineering, Biotechnology, Nutrition Technology

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Electronic Resource

1749-6632

Blackwell Publishing Journal Backfiles 1879-2005

Natural Sciences in General

Electronic Resource

1365-2486

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Energy, Environment Protection, Nuclear Power Engineering

Geography

Global change may affect the structure and functioning of decomposer food webs through qualitative changes in freshly fallen litter. We analyzed the predicted effects of a changing environment on a dynamic model of a donor-controlled natural decomposer ecosystem near Wekerom, the Netherlands. This system consists of fungi, bacteria, fungivores, bacterivores and omnivores feeding on microbiota and litter as well. The model concentrates on carbon and nitrogen flows through the trophic niches that define this decomposer system, and is designed to predict litter masses and abundances of soil biota. For modeling purposes, the quality of freshly fallen leaf litter is defined in terms of nitrogenous and non-nitrogenous components, of which refractory and labile forms are present. The environmental impacts of elevated CO2, enhanced UV-B and eutrophication, each with their own influence on leaf litter quality, are studied. The model predicts steady-state dynamics exclusively, for all three scenarios. Environmental changes impact most demonstratively on the highest trophic niches, and affect microbiotic abundances and litter decomposition rates to a lesser extent. We conclude that the absence of trophic cascade effects may be attributed to weak trophic links, and that non-equilibrium dynamics occurring in the system are generally because of encounter rates based on fractional substrate densities in the litter. We set out a number of experimentally testable hypotheses that may improve understanding of ecosystem dynamics.

Electronic Resource

1365-2486

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Energy, Environment Protection, Nuclear Power Engineering

Geography

In this article, we evaluate how global environmental change may affect microfood-webs and trophic interactions in the soil, and the implications of this at the ecosystem level. First we outline how bottom-up (resource control) and top-down (predation-control) forces regulate food-web components. Food-web components can respond either positively or negatively to shifts in NPP resulting from global change, thus creating difficulties in developing general principles about the response of soil biota to global change phenomena. We also demonstrate that top-down effects can be important in soil food-webs, creating negative feed-backs which may partially counter bottom-up effects. Secondly, we determine how soil food-webs and the processes they regulate respond to various global change phenomena. Enhanced atmospheric CO2 levels can have two main effects on plants which are relevant for the soil food-web, i.e. enhanced NPP (often positive) and diminished organic matter quality (with negative effects, at least in the short term). Climate change effects resulting from elevated CO2 levels may be mainly secondary through alteration of vegetation, as shown by examples. Intensification of land management is usually associated with greater disturbance, which alters soil food-web composition and key processes; this is particularly apparent in comparisons of conventionally tilled and nontilled agroecosystems. Global change involves shifts in plant species composition and diversity, possibly affecting soil food-webs; we interpret this in terms of theories relating biodiversity to ecosystem function. We conclude that a more detailed understanding of interactions between NPP, soil organic matter and components of the soil food-web, as well as their regulation of biogeochemical processes and ultimately ecosystem-level properties, is essential in better understanding long-term aspects of global change phenomena.

Electronic Resource

1546-1718

Nature Archives 1869 - 2009

Biology

Medicine

[Auszug] Both serotonin (5-HT) and neuropeptide Y have been shown to affect a variety of mammalian behaviors, including aggression. Here we show in Drosophila melanogaster that both 5-HT and neuropeptide F, the invertebrate homolog of neuropeptide Y, modulate aggression. We show that drug-induced increases ...

Electronic Resource

1546-1718

Nature Archives 1869 - 2009

Biology

Medicine

[Auszug] Aggressive behavior is pervasive throughout the animal kingdom, and yet very little is known about its molecular underpinnings. To address this problem, we have developed a population-based selection procedure to increase aggression in Drosophila melanogaster. We measured changes in aggressive ...

Electronic Resource