Search Results - (Author, Cooperation:S. Lenk)

2013-03-29

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Adhesins, Bacterial/metabolism ; Archaea/classification/enzymology/genetics/*metabolism ; Cysteine Endopeptidases/metabolism ; Geologic Sediments/chemistry/*microbiology ; Marine Biology ; Molecular Sequence Data ; Peptide Hydrolases/*metabolism ; Phylogeny ; Proteolysis ; RNA, Ribosomal, 16S/genetics ; Single-Cell Analysis

2018-05-26

American Association for the Advancement of Science (AAAS)

2375-2548

Natural Sciences in General

1077-3118

AIP Digital Archive

Physics

We have developed a method for fabricating epitaxial CoSi2 nanowires using only conventional optical lithography and standard silicon processing steps. This method was successfully applied to ultrathin epitaxial CoSi2 layers grown on Si(100) and silicon-on-insulator substrates. A nitride mask induces a stress field near its edges into the CoSi2/Si heterostructure and leads to the separation of the CoSi2 layer in this region during a rapid thermal oxidation step. A subsequent etching step and a second oxidation generate highly homogenous silicide wires with dimensions down to 50 nm. © 2001 American Institute of Physics.

Electronic Resource

1436-2449

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Physics

Summary Viscosity measurements are reported for syndiotactic polystyrenes in a molar mass range from 35,000 to 400,000 g/mol and standard fractions of narrowly distributed atactic polystyrenes in a molar mass range from 50,000 to 600,000 g/mol in trichlorobenzene at 135 °C. The correlation between molar mass and intrinsic viscosity of different polystyrene samples was investigated as well as their solution properties. The results demonstrate that the intrinsic viscosity of polystyrene in thermodynamically good solvents is independent of the type of tacticity of the polystyrenes investigated here. The dilute solution properties were compared with those for isotactic and atactic polystyrenes. The small differences in their solution viscosities may occur due to the different molar mass distributions of differently synthesized samples.

Electronic Resource

1434-0879

Calcium oxalate urolithiasis ; Texture examination ; Polarising microscopy ; Hypercalciuria ; Hyperuricosuria ; Metaphylaxis

Springer Online Journal Archives 1860-2000

Medicine

Summary Texture examinations were made on 416 thin section and on 1,000 grain preparations of calcium oxalate calculi. The frequency of occurrence of four basic texture types in relation to pathological urine parameters, age and sex of the patients as well as types of stone removal are discussed. Percentage share of texture type I that correlates to hyperuricosuria shows a steady increase with increasing age. The proportions of types III and IV that are linked to hypercalciuria decrease with increasing age. The examinations show the feasibility of texture-type determinations within routine stone analysis and create the precondition for texture types to be included in metaphylaxis of calcium oxalate lithiasis.

Electronic Resource

1434-0879

Urogenital tuberculosis ; Urolithiasis ; Texture of calculi

Springer Online Journal Archives 1860-2000

Medicine

Summary Of 628 patients with bacteriologicaly or histologicaly proven urogenital tuberculosis (UGT) treated from 1960 to 1985. 126 patients (20.1%) had additional urinary tract infection and 66 patients (10.5%) developed urolithiasis. In these 66 patients a simultaneous urinary tract infection occured in 29 cases (43.9%). Twenty-eight calculi were analyzed by a combined crystal-optical and x-ray-diffraction method. A high incidence of struvite/carbonate apatite calculi (11/28) as well as of calcium phosphate calculi (6/28) was found. The texture of 15 calculi was investigated on thin sections by polarization microscopy and a high concentration of organic material was found in both calcium oxalate and struvite/carbonate apatite calculi probably due to the specific and nonspecific infection with deposition of cell and protein degradation products.

Electronic Resource

1573-2584

Springer Online Journal Archives 1860-2000

Medicine

Abstract A resigning attitude in respect to patients suffering from nephrolithiasis and manifest renal failure is not justified anymore in view of the advances in diagnosis and therapy. During the period 1964–1975, at the urological clinic of the hospital Friedrichshain 188 patients suffering from nephrolithiasis and renal failure have been treated: 120 surgically and 68 conservatively. The operative-therapeutical conception is outlined. The pre- and postoperative hemodialysis according to the stage of renal failure are elaborated. Tabulated data demonstrate the fate of all surgically treated patients.

Electronic Resource

0021-9541

Life and Medical Sciences ; Cell & Developmental Biology

Wiley InterScience Backfile Collection 1832-2000

Biology

Medicine

We evaluated the role of cytoskeletal elements in the degradation of endogenous proteins via autophgy using biochemical and morphological techniques. In the absence of exogenous amino acids, degradation of endogenous proteins was enhanced in cultured normal rat kidney cells. This enhanced degradative state was accompanied by a 4-fold increase in the occurrence of autophagic vacuoles. In the presence of drugs that induce the depolymerization of microfilaments (cytochalasins B and D) or microtubules (nocodazole), protein degradation was not enhanced in nutrient-deprived cells. Although these drugs had similar inhibitory effects on the protein degradation, their effect on autophagy differed. Cytochalasins B and D interfered with the formation of the autophagosome. In cells treated with these drugs, the fractional volume represented by autophagic vaculoes was not substantially increased despite nutrient depletion. On the contrary, nocodazole appeared to have no effect on the formation of autophagosomes. Instead, this drug suppressed the delivery of hydrolytic enzymes, thereby resulting in an accumulation of acidic autophagic vacuoles containing undegraded cellular components. © 1992 Wiley-Liss, Inc.

6 Ill.

Electronic Resource