Search Results - (Author, Cooperation:I. Henry)

2013-07-26

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Animals ; Body Patterning ; Head/*growth & development/physiology ; Models, Animal ; Molecular Sequence Data ; Planarians/*anatomy & histology/*physiology ; *Regeneration ; Tail/growth & development ; Wnt Proteins/metabolism ; Wnt Signaling Pathway ; beta Catenin/biosynthesis/deficiency/genetics/metabolism

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] ON May 20, near Chindi, in the State of Sukét, North-Western Himalaya, I was able to make notes on the pollination of Pieris ovalifolia by Pieris brassicae, Pieris soracta, and other insects. Pieris ovalifolia, D. Don, at Chindi, grows to be a small tree in forests of Pinus longifolia and Pinus ...

Electronic Resource

1573-2932

decontamination ; desorption ; explosive ; soil contamination ; surfactant ; 2,4,6-trinitrotoluene ; TNT

Springer Online Journal Archives 1860-2000

Energy, Environment Protection, Nuclear Power Engineering

Abstract Surfactant enhanced desorption of 2,4,6-trinitrotoluene (TNT) from contaminated soils at a military site was investigated. Anionic (SDS and DOWFAX 8390), cationic (CTAC and CTAB), and nonionic (Tween 80 and Brij 35) surfactants were first tested at concentrations ranging from 0.1 to 1%. The anionic and nonionic surfactants were further tested at concentrations of up to 10%. Anionic surfactants, particularly SDS, provided the best desorption of TNT from the soil. There was not any increase in TNT desorption for both the nonionics and cationics at concentrations ranging between 0.1 to 1% and the extent of desorption was found to be lower than the TNT desorption only by water. The competition of the negatively charged soil surfaces for the positively charged cationics and the neutral nonionic surfactants may constitute the underlying reason. TNT was significantly desorbed when the concentrations of Tween 80, DOWFAX 80 and SDS were increased up to 10%.

Electronic Resource

book

1989

English

book

2002

Methode ; Psychologische Forschung ; Intelligenz (Psychologie) ; Kognitionspsychologie ; Kognitive Kompetenz ; Persönlichkeit ; Psychologie ; Messung ; Messverfahren ; Wertorientierung ; Bewertung ; Gültigkeit ; Standard ; USA

English

Literaturangaben

book

1986

Methode ; Reliabilität ; Testauswertung ; Schüler ; Aufsatz ; Bewertung ; Leistungsmessung

English

Literaturangaben 40, Tabellen

book

1986

Test ; Kind ; Schüler ; Schülerleistung ; Behinderung ; Gültigkeit ; Leistung

English

Literaturangaben 17, Tabellen

book

1985

Testauswertung ; Schüler ; Leistungsbeurteilung ; Schülerleistung ; Graduate School ; Studienerfolg ; Leistung ; Prognose

English

Literaturangaben 45, Tabellen

book

1988

English

book

1988

English

book

2014

Bewertung ; Niederlande

English

Educational tests and measurements, Congresses. ; Psychological tests, Congresses.

x, 329 p.

0-585-39403-2

1089-7550

AIP Digital Archive

Physics

Epitaxial alignment has been obtained by means of grain growth in polycrystalline films deposited on single-crystal substrates. A theory for epitaxial grain growth is outlined and results given for experiments on Au, Al, Cu, and Ag films on vacuum-cleaved NaCl, KBr, KCl, or mica. Epitaxial grain growth provides a fundamentally different alternative to conventional epitaxy, and can lead to very thin films with improved continuity and crystalline perfection, as well as non-lattice-matched orientations.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Arrays of evaporated nickel particles with a variety of diameters (75–122 nm) and aspect ratios are fabricated in order to study the effect of the particles' geometry on their magnetic behavior, interactions and switching mechanism. Hysteresis loops generated by simulating single-domain particles with out-of-plane magnetization are compared to the experimentally obtained data. © 2000 American Institute of Physics.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: The binding of [3H]pirenzepine to a human neuroblastoma cell line (SH-SY5Y) and its correlation with hydrolysis of phosphatidylinositols were characterized. Specific [3H]pirenzepine binding to intact cells was rapid, reversible, saturable, and of high affinity. Kinetic studies yielded association (k+1) and dissociation (k-1) rate constants of 5.2 ± 1.4 × 106 M−1 min−1 and 1.1 ± 0.06 × 10−1 min−1, respectively. Saturation experiments revealed a single class of binding sites (nH= 1.1) for the radioligand with a total binding capacity of 160 ± 33 fmol/mg protein and an apparent dissociation constant of 13 nM. The specific [3H]pirenzepine binding was inhibited by the presence of selected muscarinic drugs. The order of antagonist potency vas atropine sulfate 〉 pirenzepine 〉 AF-DX116, with K0.5 of 0.53 nM, 2.2 nM, and 190 nM, respectively. The binding properties of [3H](-)-quinuclidinyl benzilate and its quaternary derivative [3H](-)-methylquinuclidinyl benzilate were also investigated. The muscarinic agonist carbachol stimulated formation of inositol phosphates which could be inhibited by muscarinic antagonists. The inhibition constants of pirenzepine and AF-DX 116 were 11 nM and 190 nM, respectively. In conclusion, we show that the nonclassical muscarinic receptor antagonist [3H]pirenzepine identifies a high-affinity population of muscarinic sites which is associated with hydrolysis of phosphatidylinositols in this human neuroblastoma cell line.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: t[3H]Butylbicycloorthobenzoate ([3H]TBOB; 22 Ci/mmol) was prepared by reductive dechlorination of its 4-chlorophenyl analog with tritium gas. This new radioligand binds reversibly to fresh washed rat brain P2 membranes in 500 mM NaCl plus 50 mM sodium-potassium phosphate buffer (pH 7.4) at 25°C, with 80–90% specific relative to total binding, a KD of 61 ± 15 nM, and a Bmax of 1.6 ± 0.5 pmol/mg of protein. [3H]TBOB association with its binding site(s) is monophasic, but its dissociation is biphasic. The binding characteristics of [3H]TBOB are essentially identical to those of t-[35S]butylbicyclophosphorothionate ([35S]TBPS) with respect to pH dependence, stimulation by anions, regional distribution in the brain, and pharmacological profile. Saturation analyses and dissociation studies further indicate that TBOB and TBPS have a common binding site. However, binding of the two radioligands differs in respect to temperature effects. In contrast to [35S]TBPS, which exhibits negligible binding at 0°C, [3H]TBOB binds to rat brain membranes at 0, 25, and 37°C with similar KD values. [3H]TBOB with its long radioactive half-life and temperature-independent KD is a valuable supplement to [35S]TBPS in further biochemical and pharmacological characterization of the γ-aminobutyric acid receptor-ionophore complex.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

SYNOPSIS. Specimens of Blepharisma undulans were transferred from young clone cultures to a rotocompressor with 3 mm3 of culture medium. The organisms were slightly compressed and photographed at various intervals with dark field illumination. The sequence of macronuclear and cytoplasmic changes was compared with similarly followed Feulgen preparations.The cycle falls into several phases: (1) an interphase (12–24 hr.) in which the organism increases in size while cytoplasmic and macronuclear appearances remain unchanged. During this phase, the macronucleus consists of 3 to 5 nodes of various sizes connected by strands. (2) a pre-condensation phase (1 hr.) in which a new posterior peristome and cytopyge appear without visible macronuclear change. (3) a condensation phase (10–20 min.) in which the macronuclear nodes coalesce into a round mass without dissolution of the central nodes or strands. (4) a postcondensation phase (1 hr.) characterized by: (a) elongation of the condensed macronucleus into a rod-like shape followed by typical nodal formation; or (b) elongation of the condensed macronucleus into a form resembling the letter “J”, followed by nodal formation, and resulting in a double row of nodes in one daughter and a single row in the other. Separation occurs at this time, initiating the new interphase. The development of the j-form macronucleus. the lack of obliteration of the central nodes, and the characteristic interphase condition distinguish this strain of B. undulans from others described elsewhere.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

SYNOPSIS. Cannibal giant Blepharisma undulans americanus, NYU strain, grown in mass culture, showed increased numbers of macronuclear lobes and greater variability in their number, compared to the bacteria-fed form. Feulgen and methyl greenpyronin preparations stained both the DNA and RNA of the cannibals and of the ingested forms within the food vacuoles.During the first 3 to 6 hours of digestion, macronucleus and deoxyribonucleic acid disappear from the food vacuole; during the last 6 hours the ribonucleic acid disappears from the food vacuole; DNA and RNA are therefore presumed to be digested and absorbed.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

SUMMARY. Isolated Blepharisma undulans were studied for the following: (1) fission rate, (2) mating behavior, (3) giant formation, (4) effects of daily transections. The organisms were maintained at 22°C. and isolated daily for 60 days. Fission rate varied from two divisions a day to one in 29 days. The major factor producing the variation appeared to be the type or amount of food. Frequency of conjugation also varied greatly. Daughters of a single organism will mate within 24 hours after division. Conjugation followed by one division, re-isolation, then conjugation within 24 hours following a second division occurred within a 5 day period. Giants were produced within 3 days by feeding with Khawkinea, Chilomonas and Paramecium. Paramecium alone did not produce giants. Exposure to 10−m, 10−4M colchicine did not accelerate this process.Daily transections into approximately equal halves were made. The anterior halves containing the mouth membranelles were followed. Fission rate was not affected by cutting. A progressive decrease in size occurred. All ultimately lysed, most on the 7th day. If cutting was suspended on any day, recovery and fission followed. If cutting was re-instituted, lysis would again occur on or about the 7th day. Daily amputation of the posterior tip for 2 weeks did not affect either size, fission rate, or longevity.

Electronic Resource

1550-7408

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Synopsis.A simplified method for obtaining axenic cultures of Blepharisma involves the use of penicillin, streptomycin, and tetracycline. Cytologic examination disclosed no significant effect of these antibiotics on the structure of the ciliates.

Electronic Resource