ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

AQUAPORIN-2 AND -3: Representatives of Two Subgroups of the Aquaporin Family Colocalized in the Kidney Collecting Duct (1998)

Sasaki, S. ; Ishibashi, K. ; Marumo, F.

Palo Alto, Calif. : Annual Reviews

Annual Review of Physiology 60 (1998), S. 199-220

add to mindlist on the mindlist

Details

ISSN: 0066-4278

Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Topics: Medicine , Biology

Notes: Abstract Since the molecular identification of the first aquaporin in 1992, the number of proteins known to belong to this family has been rapidly increasing. These members may be separated into two subgroups based on gene structure, sequence homology, and function. Regulation of the water permeability of the collecting ducts of the kidney is essential for urinary concentration. Aquaporin-2 and -3, which are representative of these subgroups, are colocalized in the collecting ducts. Understanding these subgroups will elucidate the differences between aquaporin-2 and -3. Aquaporin-2 is a vasopressin-regulated water channel located in the apical membrane, and aquaporin-3 is a constitutive water channel located in the basolateral membrane. In contrast to aquaporin-3, which appears to be less well regulated, many studies have now identified multiple regulational mechanisms at the gene, protein, and cell levels for aquaporin-2, thus reflecting its physiological importance. Evidence of the participation of aquaporin-2 in the pathophysiology of water-balance disorders is accumulating.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1146/annurev.physiol.60.1.199

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

High quality Nb/Al–AlOx/Nb superconducting tunnel junctions for radiation detection (1996)

Joosse, K. ; Nakagawa, H. ; Akoh, H. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 68 (1996), S. 702-704

add to mindlist on the mindlist

Details

ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Nb/Al–AlOx/Nb tunnel junctions designed for x-ray detection have been manufactured and characterized at temperatures down to 0.35 K. At a bias voltage of 0.5 mV, a leakage current of the order of 0.1 pA/μm2, and a dynamic resistance exceeding 106 times the normal state resistance, were achieved in junctions with dimensions up to 200×200 μm2 and critical current densities of order 200 A/cm2. The combination of high critical current density, low leakage current, and large area represents an important step towards the development of superconducting tunnel junction detectors with improved spectroscopic performance. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.116597

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Third-order nonlinear optical properties and dielectric properties of Pb-complex perovskite thin films prepared by sol-gel method (1997)

Hashimoto, T. ; Ishibashi, K. ; Yoko, T.

Springer

Journal of sol gel science and technology 9 (1997), S. 211-218

add to mindlist on the mindlist

Details

ISSN: 1573-4846

Keywords: 3rd- and 2nd-NLO ; dielectric constant ; ferroelectric Pb-complex perovskites ; sol-gel method ; morphotropic phase boundary

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The third-order nonlinear optical properties of the sol-gel derived Pb(Fe1/2Nb1/2)O3-PbTiO3 (PFN-PT) thin films have been investigated by the THG method. The χ(3) values of PFN-PT thin films increased from 3.2×10−12 esu (PT) to 8.5×10−12 esu (PFN) with increasing content of Fe3+ ions which possessed very high second-hyperpolarizability, ψ(Fe2/3O). It was experimentally confirmed that complex oxides such as ABO3-type perovskites consisting of large non-transition metal A-site cations and small transition metal B-site cations exhibited high χ(3) as expected from Lines' model. It was also found that the χ(3) values of complex oxides could be estimated from the second-hyperpolarizabilities of the constituent single oxides reported so far. Because of the large remanent polarization, PT thin films may exhibit the highest χ(3) among the ferroelectric PFN-PT thin films studied in the present work. The maximum dielectric constant, ε, of 1990 at room temperature was obtained for 0.5PFN·0.5PT thin films, whose composition corresponds to so-called morphotropic phase boundary (MPB).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02439400

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

4

Electronic Resource

Third-Order Nonlinear Optical Properties and Dielectric Properties of Pb-Complex Perovskite Thin Films Prepared by Sol-Gel Method (1997)

Hashimoto, T. ; Ishibashi, K. ; Yoko, T.

Springer

Journal of sol gel science and technology 9 (1997), S. 211-218

add to mindlist on the mindlist

Details

ISSN: 1573-4846

Keywords: 3rd- and 2nd-NLO ; dielectric constant ; ferroelectric Pb-complex perovskites ; sol-gel method ; morphotropic phase boundary

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The third-order nonlinear optical properties of the sol-gel derived Pb(Fe1/2Nb1/2)O3-PbTiO3 (PFN-PT) thin films have been investigated by the THG method. The (3) values of PFN-PT thin films increased from 3.2 × 10-12 esu (PT) to 8.5 × 10-12 esu (PFN) with increasing content of Fe3+ ions which possessed very high second-hyperpolarizability, γ (Fe2/3O). It was experimentally confirmed that complex oxides such as ABO3-type perovskites consisting of large non-transition metal A-site cations and small transition metal B-site cations exhibited high χ(3) as expected from Lines' model. It was also found that the χ(3) values of complex oxides could be estimated from the second-hyperpolarizabilities of the constituent single oxides reported so far. Because of the large remanent polarization, PT thin films may exhibit the highest χ(3) among the ferroelectric PFN-PT thin films studied in the present work. The maximum dielectric constant,ɛ , of 1990 at room temperature was obtained for 0.5PFN · 0.5PT thin films, whose composition corresponds to so-called morphotropic phase boundary (MPB).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1026429600633

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

5

Electronic Resource

Microwave spectroscopy of a quantum-dot molecule (1998)

Fujisawa, T. ; van der Wiel, W. G. ; Ishibashi, K. ; [et al.]

[s.l.] : Macmillan Magazines Ltd.

Nature 395 (1998), S. 873-876

add to mindlist on the mindlist

Details

ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Quantum dots are small conductive regions in a semiconductor, containing a variable number of electrons (from one to a thousand) that occupy well-defined, discrete quantum states—for which reason they are often referred to as artificial atoms. Connecting them to current and voltage ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/27617

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

6

Electronic Resource

Immunohistochemical localization of a water channel, aquaporin 7 (AQP7), in the rat testis (1999)

Suzuki-Toyota, F. ; Ishibashi, K. ; Yuasa, S.

Springer

Cell & tissue research 295 (1999), S. 279-285

add to mindlist on the mindlist

Details

ISSN: 1432-0878

Keywords: Key words Spermatids ; Spermatozoa ; Spermatogenesis ; Cell volume reduction ; Rat (Wistar)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract Cell volume reduction is one of the most distinct morphological changes during spermiogenesis and may be largely attributable to water efflux from the cell. A strong candidate for a water efflux route, aquaporin 7 (AQP7), which is a water channel, was studied immunohistochemically in the rat testis. Immunoreactivity was restricted within the elongated spermatids, testicular spermatozoa, and residual bodies remaining in the seminiferous epithelium. Weak but distinct immunoreactivity was first observed in the cytoplasmic mass of the spermatid at step 8 of spermiogenesis. The Golgi-like apparatus became steadily immunoreactive at step 10. The plasma membrane covering the cytoplasmic mass showed strong immunoreactivity after step 16. At this step, the middle piece of the tail also showed immunoreactivity at the portion protruding into the lumen. The whole head and distal tail, where the elongated spermatid had only a limited amount of cytoplasm, showed no immunoreactivity throughout spermiogenesis. After spermiation, the immunoreactivity of AQP7 remained at the middle piece and in the cytoplasmic droplet in the testicular spermatozoon. The present observations suggest that AQP7 contributes to the volume reduction of spermatids, since this water channel protein is localized on the plasma membrane covering the condensing cytoplasmic mass of the elongated spermatid, and since the seminiferous tubule fluid is hypertonic.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s004410051234

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

7

Electronic Resource

Optical isolation of individual mitochondria ofPhysarum polycephalum for PCR analysis (1996)

Kuroiwa, T. ; Ishibashi, K. ; Takano, H. ; [et al.]

Springer

Protoplasma 194 (1996), S. 275-279

add to mindlist on the mindlist

Details

ISSN: 1615-6102

Keywords: Mitochondria ; Physarum polycephalum ; Polymerase chain reaction ; Optical trap ; Microdissection

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary We attempted to amplify a specific region of mitochondrial DNA (mtDNA) using the polymerase chain reaction (PCR) from fewer than ten mitochondria isolated individually by microdissection or use of an optical tweezer. We selected preliminarily isolated mitochondria fromPhysarum polycephalum as the model materials and tried to amplify the mtDNA region corresponding to the specific mitochondrial plasmid of this true slime mould. For separation of a few mitochondria from the mitochondrial population, we initially used a destruction method in which excluded mitochondria were disrupted by a UV laser. However, mtDNA was still amplified, although weakly, from mitochondria that had been destroyed by the UV laser. Therefore, we used an optical tweezer to trap individual mitochondria and separate them from the others. The required number of mitochondria were separated from the mitochondrial suspension through a narrow canal of isolation buffer and used directly for PCR amplification. The results showed that the mtDNA could be amplified from at least 9 mitochondria trapped by the optical tweezer.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01882033

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

8

Electronic Resource

The effect on immunocytes of anodic oxide titanium after hydrothermal treatment (1998)

Takebe, J. ; Itoh, S. ; Ariake, T. ; [et al.]

Hoboken, NJ : Wiley-Blackwell

Journal of Biomedical Materials Research 42 (1998), S. 272-277

add to mindlist on the mindlist

Details

ISSN: 0021-9304

Keywords: anodic oxide titanium ; hydrothermal treatment ; SA-treated titanium ; biomaterial ; immunocyte ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine , Technology

Notes: All dental root implants come in contact with the oral epithelium, and many complex factors are found to arise in this region. In order to perform a successful dental root implantation, it is necessary to clarify the interaction of the dental root implant material with the host defense mechanisms involved in the specific and nonspecific immune responses to many antigens in oral bacteria and their components. Recently, focusing on developing the dental root implant, the Nikon Corporation improved the surface characteristics of pure titanium even further by developing a hydroxyapatite (HA) layer formed on an anodic titanium oxide film containing Ca and P via hydrothermal treatment (SA treatment). However, since little is known about the effect of SA-treated pure titanium (HA/Ti) on the defense mechanisms of the oral membrane epithelium, we investigated (1) the in vitro proliferation of murine splenic B lymphocytes on the surface of HA/Ti in the presence of three lipopolysaccharide (LPS) concentrations and (2) interleukin-1α (IL-1α) production by the reaction of human peripheral blood mononuclear cells (PBM cells) on the surface of HA/Ti under the same concentrations. After culture, murine splenic lymphocytes were measured by uptake of 3H-thymidine, and cytokine release (IL-1α) from PBM cells was measured by ELISA. Results showed that HA/Ti had hardly any effect on the LPS-induced proliferation of B lymphocytes and IL-1α production. In vitro investigations of the effects of HA/Ti on the LPS-induced proliferation of murine splenic B lymphocytes and IL-1α from PBM cells might be a useful way of elucidating the defense mechanism between implants and the oral epithelium. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 42, 272-277, 1998.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

Permalink