Search results for: G. Sauermann

Items from 1 to 20 out of 21 results

article

The morphology of dunes

H.J. Herrmann, G. Sauermann, V. Schwämmle

Physica A: Statistical Mechanics and its Applications > 2005 > 358 > 1 > 30-38

The motion of dunes and their morphology is a fascinating, largely unexplored subject. Already the barchan, the simplest moving dune, poses many questions. We will present some results of field measurements on desert and costal dunes. Then we will present a model which consists of three coupled equations of motion for the topography, the shear stress of the wind and the sand flux. These evolution...

article

Calculation of the separation streamlines of barchans and transverse dunes

H.J. Herrmann, J.S. Andrade, V. Schatz, G. Sauermann, more

Physica A: Statistical Mechanics and its Applications > 2005 > 357 > 1 > 44-49

We use FLUENT to calculate the wind profile over barchans and transverse dunes. The form of the streamlines of flow separation at the lee side of the dunes is determined for a symmetric barchan dune in three dimensions, and for the height profile of a measured transverse dune field in the Lençóis Maranhenses.

article

Wind velocity and sand transport on a barchan dune

G. Sauermann, J.S. Andrade, L.P. Maia, U.M.S. Costa, more

Geomorphology > 2003 > 54 > 3-4 > 245-255

We present measurements of wind velocity and sand flux performed on the windward side of a large barchan dune in Jericoacoara, northeastern Brazil. From the measured profile, we calculate the air shear stress using an analytical approximation and treat the problem of flow separation by an heuristic model. We find that the results from this approach agree well with our field data. Moreover, using the...

article

Modelling a dune field

A.R. Lima, G. Sauermann, H.J. Herrmann, K. Kroy

Physica A: Statistical Mechanics and its Applications > 2002 > 310 > 3-4 > 487-500

We present a model to describe the collective motion of barchan dunes in a field. Our model is able to reproduce the observation that a typical dune stays confined within a stripe. We also obtain some of the pattern structures which resemble those observed from aerial photos which we do analyse and compare with the specific field of Laayounne.

article

The shape of the barchan dunes of Southern Morocco

G. Sauermann, P. Rognon, A. Poliakov, H.J. Herrmann

Geomorphology > 2000 > 36 > 1-2 > 47-62

We present detailed shape measurements of several barchan dunes in southern Morocco, near Laayoune. Using these data, we disprove the concept of shape invariance of barchan dunes of different sizes. Nevertheless, some parts of the barchan dune scale and we try to distinguish these from non-scaling ones. Furthermore, we point out the importance of the exact position of the brink for the overall dune...

article

The shape of dunes

H.J. Herrmann, G. Sauermann

Physica A: Statistical Mechanics and its Applications > 2000 > 283 > 1-2 > 24-30

We present models to describe the dynamics of the surface of a dry granular bed, like a desert. These models, based on coupled differential equations can describe the formation and evolution of dunes. Field measurements have been performed to compare the numerical results. The concept of the Barchan dune as a soliton is disproved. We discuss in particular also the wind field and the microscopic coupling...

article

Clinical and biophysical efficacy of a novel coenzyme Q ₁ ₀ containing anti-wrinkle cream (Eucerin ⁽ R) Q10 active)

A. Schölermann, G. Wendt, W. Diembeck, J. Ennen, more

Journal of the European Academy of Dermatology and Venereology > 1998 > 11 > Supplement 2 > S270

article

Polymer sensor arrays for evaluation of human body odours

C. Schröder, I. Mirbach, M. Keskin, G. Sauermann, more

Journal of Dermatological Science > 1998 > 16 > Supplement 1 > S119

article

Assessment of cutaneous perspiration by image analysis

M. Keskin, C. Schröder, A. Takors, G. Sauermann, more

Journal of Dermatological Science > 1998 > 16 > Supplement 1 > S119

article

Anti-adhesives for the treatment of staphylococcal superinfections of human skin and mucosal tissues

C. Meier, R. Wolber, D. Drexler, G. Sauermann, more

Journal of Dermatological Science > 1998 > 16 > Supplement 1 > S197

article

Alteration of Nuclear Matrix Protein Composition during Apoptosis in Rat Embryo Cells

C. Gerner, C. Seelos, G. Sauermann

Experimental Cell Research > 1998 > 238 > 2 > 472-480

Alteration of the nuclear matrix protein composition during active cell death was investigated by high resolution 2-dimensional gel electrophoresis and computer-assisted image analysis. Nuclear matrices were isolated from purified nuclei of a rat embryo cell line showing an immediate apoptotic response to serum reduction. While cell shrinkage and cytoplasmic compaction, characteristic features of...

article

Functional antioxidants in skin protection and prophylaxis of polymorphic light eruption

F. Stäb, R. Wolber, S. Untiedt, I. Hadshiew, more

Journal of the European Academy of Dermatology and Venereology > 1997 > 9 > 1001 > S237

The glutathione redoxsystem is one of the most important intracellular antioxidant systems. In ex vivo/in vitro studies using human suction blister epidermis and skin biopsies we found that natural antioxidants can protect the intracellular glutathione (GSH) level of keratinocytes and fibroblasts from depletion by free radicals. Our findings from ex vivo/in vitro investigations show that i. e. flavonoid...

article

Natural antioxidants protect skin at the cellular level and can be prophylactic against polymorphous light eruption

F. Stäb, H. Wenck, R. Wolber, S. Untiedt, more

Journal of Investigative Dermatology > 1997 > 108 > 4 > 667

In studies using human peripheral blood leucocytes (PBL), cell suspensions of suction blister epidermis and of skin biopsies we found that natural antioxidants can bolster and protect the intracellular glutathione (GSH) level of PBL, keratinocytes and fibroblasts from depletion by free radicals. Our findings from in vivo/ex vivo/in vitro investigations show that endogenously supplied components,...

article

Influence of NO-Synthase Antagonists in Rosacea Patients

G. Sauermann, S. Jaspers, U. Hoppe, B. Salzer, more

Journal of Investigative Dermatology > 1997 > 108 > 4 > 657

Background:Rosacea in its primary stages is characterized by an intense facial reddening. Blood flow is influenced by endothelium derived relaxing factor, which is probably identical with nitric oxide (NO). NO is synthesized in endothelial cells to regulate vascular tone by constitutive NO-synthase (cNOS). Erythema is characterized by transient induction (IL1, INFγ, bacterial lipopolysaccharides)...

article

A novel lantibiotic from Lactococcus lactis for the treatment of acne vulgaris

F. Wolf, B. Traupe, A. Takors, G. Sauermann, more

Journal of Investigative Dermatology > 1997 > 108 > 4 > 657

Acne vulgaris is caused and aggravated by a number of different factors, among which colonisation of sebaceous glands with Propionibacterium acnes appears to play a key role in the etiology of the disease. Prop. acnes has been shown to produce and secrete a number of lipolytic enzymes, causing enzymatic degradation of sebum and production of pro-inflammatory metabolites from polyunsaturated fatty...

article

Antioxidant status and role of oxidative stress in atopic dermatitis

F. Stäb, V. Schreiner, S. Untiedt, G. Sauermann, more

Journal of Investigative Dermatology > 1996 > 106 > 4 > 888

The pathogenic mechanisms in atopic dermatitis (AD) appear obscure and multifactorial. It is still unknown whether AD is induced by immunological dysfunctions causing secundarily skin barrier defects or whether primarily skin barrier defects in AD are caused by dysfunctional keratinocyte differentiation and than the immunological events might be induced secondarily by exogenous noxes (allergens,...

article

Cutaneous formation of thio-nitroso compunds and sun burn cells following topical application of L-arginine.

G. Sauermann, B. Uhlmann, M. Döhle, T. Mann, more

Journal of Investigative Dermatology > 1996 > 106 > 4 > 859

Keratinocytes and melanocytes express mRNA and protein molecules of constituent and induced nitricoxide synthase. Nitric oxide (NO) is synthesized by enzymatic oxydation of the guanidinium-nitrogen of l-arginine. NO has a short lifetime of a few seconds forming nitrite (NO ₂ ) and nitrate (NO ₃ ). NO-storing nitroso-compounds are produced from thiols like glutathion or mercapto-group-containing...

article

Selfconsistent approximations in Mori's theory

G. Sauermann, H. Turschner, W. Just

Physica A: Statistical Mechanics and its Applications > 1996 > 225 > 1 > 19-61

The constitutive quantities in Mori's theory, the residual forces, are expanded in terms of time-dependent correlation functions and products of operators at t = 0, where it is assumed that the time derivatives of the observables are given by products of them. As a first consequence the Heisenberg dynamics of the observables are obtained as an expansion of the same type. The dynamic equations for...

article

Unique Floquet decomposition theory near resonance in quantum systems

T. Shimizu, G. Sauermann

Physica A: Statistical Mechanics and its Applications > 1995 > 218 > 3-4 > 375-389

A response theory in quantum systems, which can discuss the stability of the total system and the appearance of subharmonics, is proposed. The propagator of the system in the Liouville space is decomposed into the periodic factor with the same frequency as the external field and the remaining factor by using the unique Floquet decomposition theory. The relation between the usual Floquet operator...

article

Ketoproteins in Human Stratum Corneum and Factors Influencing their Formation

S. Richert, H. Steinhart, U. Hoppe, G. Sauermann

Journal of Investigative Dermatology > 1995 > 104 > 4 > 644

Oxidative modification of proteins by mixed-function oxidation (MFO) is implicated in a number of physiological and pathologic processes, including intracellular protein turnover, host defense activities, oxygen toxicity and the aging process. Introduction of carbonyl groups into amino acid residues is a hallmark of oxidative modification.Ketoproteins are oxidation products of proteins formed by...

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Keywords

DUNES (3)
AEOLIAN TRANSPORT (2)
BARCHAN (2)
WIND VELOCITY (2)
5.20.-Y (1)
5.40.+J (1)
APOPTOSIS (1)
BARCHAN DUNE (1)
COMPUTER SIMULATION (1)
DUNE FIELDS (1)
FLUENT (1)
GRANULAR MATERIAL (1)
GRANULAR MEDIA (1)
HEISENBERG DYNAMICS (1)
IMAGE ANALYSIS (1)
MOROCCO (1)
NUCLEAR MATRIX (1)
PACS (1)
PROJECTION OPERATOR TECHNIQUE (1)
RELAXATION FUNCTIONS (1)
RESIDUAL FORCES (1)
SAND TRANSPORT (1)
SEPARATION BUBBLE (1)
SHAPE OF A HEAP (1)
TWO-DIMENSIONAL POLYACRYLAMIDE GEL ELECTROPHORESIS (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 45.70.-N (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 45.70.QJ (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 45.70.VN (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 89.20.-A (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 91.10.JF (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 92.60.GN (1)
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INFONA - science communication portal

Search results for: G. Sauermann

The morphology of dunes

Calculation of the separation streamlines of barchans and transverse dunes

Wind velocity and sand transport on a barchan dune

Modelling a dune field

The shape of the barchan dunes of Southern Morocco

The shape of dunes

Clinical and biophysical efficacy of a novel coenzyme Q ₁ ₀ containing anti-wrinkle cream (Eucerin ⁽ R) Q10 active)

Polymer sensor arrays for evaluation of human body odours

Assessment of cutaneous perspiration by image analysis

Anti-adhesives for the treatment of staphylococcal superinfections of human skin and mucosal tissues

Alteration of Nuclear Matrix Protein Composition during Apoptosis in Rat Embryo Cells

Functional antioxidants in skin protection and prophylaxis of polymorphic light eruption

Natural antioxidants protect skin at the cellular level and can be prophylactic against polymorphous light eruption

Influence of NO-Synthase Antagonists in Rosacea Patients

A novel lantibiotic from Lactococcus lactis for the treatment of acne vulgaris

Antioxidant status and role of oxidative stress in atopic dermatitis

Cutaneous formation of thio-nitroso compunds and sun burn cells following topical application of L-arginine.

Selfconsistent approximations in Mori's theory

Unique Floquet decomposition theory near resonance in quantum systems

Ketoproteins in Human Stratum Corneum and Factors Influencing their Formation

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