scholarly journals Three dimensional ZnO nanotube arrays and their optical tuning through formation of type-II heterostructures

CrystEngComm ◽  
2016 ◽  
Vol 18 (14) ◽  
pp. 2517-2523 ◽  
Author(s):  
Lei Wang ◽  
Xing Huang ◽  
Jing Xia ◽  
Dandan Zhu ◽  
Xuanze Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Nanotube Arrays ◽  
Type Ii ◽  
Zno Nanotube

scholarly journals Type II degenerations of K3 surfaces

1985 ◽  
Vol 99 ◽  
pp. 11-30 ◽  
Author(s):  
Shigeyuki Kondo
Keyword(s):  
Number Field ◽  
Complex Manifold ◽  
Complex Number ◽  
Three Dimensional ◽  
K3 Surfaces ◽  
Type Ii ◽  
Holomorphic Map ◽  
Canonical Class ◽  
Proper Holomorphic Map ◽  
Complex Number Field

A degeneration of K3 surfaces (over the complex number field) is a proper holomorphic map π: X→Δ from a three dimensional complex manifold to a disc, such that, for t ≠ 0, the fibres Xt = π-1(t) are smooth K3 surfaces (i.e. surfaces Xt with trivial canonical class KXt = 0 and dim H1(Xt, Oxt) = 0).

Hierarchical three-dimensional MnO2/carbon@TiO2 nanotube arrays for high-performance supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63642-63651 ◽  
Author(s):  
Zicheng Wang ◽  
Yan Wang ◽  
Xia Shu ◽  
Cuiping Yu ◽  
Jianfang Zhang ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Performance ◽  
Three Dimensional ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Enhanced Conductivity

Highly ordered TiO2 nanotube arrays (TNAs) modified by other materials with enhanced conductivity and capacitance have been considered to be promising anode materials for supercapacitors.

scholarly journals Purification and Three-Dimensional Electron Microscopy Structure of the Neisseria meningitidis Type IV Pilus Biogenesis Protein PilG

2007 ◽  
Vol 189 (17) ◽  
pp. 6389-6396 ◽  
Author(s):  
Richard F. Collins ◽  
Muhammad Saleem ◽  
Jeremy P. Derrick
Keyword(s):  
Electron Microscopy ◽  
Neisseria Meningitidis ◽  
Metal Ion ◽  
Polyacrylamide Gel Electrophoresis ◽  
Three Dimensional ◽  
Type Ii Secretion ◽  
Type Ii ◽  
Type Iv Pilus ◽  
Type Iv ◽  
Pilus Biogenesis

ABSTRACT Type IV pili are surface-exposed retractable fibers which play a key role in the pathogenesis of Neisseria meningitidis and other gram-negative pathogens. PilG is an integral inner membrane protein and a component of the type IV pilus biogenesis system. It is related by sequence to the extensive GspF family of secretory proteins, which are involved in type II secretion processes. PilG was overexpressed and purified from Escherichia coli membranes by detergent extraction and metal ion affinity chromatography. Analysis of the purified protein by perfluoro-octanoic acid polyacrylamide gel electrophoresis showed that PilG formed dimers and tetramers. A three-dimensional (3-D) electron microscopy structure of the PilG multimer was determined using single-particle averaging applied to samples visualized by negative staining. Symmetry analysis of the unsymmetrized 3-D volume provided further evidence that the PilG multimer is a tetramer. The reconstruction also revealed an asymmetric bilobed structure approximately 125 Å in length and 80 Å in width. The larger lobe within the structure was identified as the N terminus by location of Ni-nitrilotriacetic acid nanogold particles to the N-terminal polyhistidine tag. We propose that the smaller lobe corresponds to the periplasmic domain of the protein, with the narrower “waist” region being the transmembrane section. This constitutes the first report of a 3-D structure of a member of the GspF family and suggests a physical basis for the role of the protein in linking cytoplasmic and periplasmic protein components of the type II secretion and type IV pilus biogenesis systems.

Development of type II pneumocytes in rat lung

1991 ◽  
Vol 260 (2) ◽  
pp. L113-L122 ◽  
Author(s):  
S. L. Young ◽  
E. K. Fram ◽  
C. L. Spain ◽  
E. W. Larson
Keyword(s):  
Three Dimensional ◽  
Alveolar Epithelium ◽  
Type Ii Cells ◽  
Type Ii ◽  
Time Period ◽  
Type Ii Pneumocytes ◽  
Type Ii Cell ◽  
Membrane Type ◽  
Cytoplasmic Processes ◽  
Homogenous Population

At a late stage of fetal development, the mammalian alveolar epithelium undergoes an abrupt differentiation as a part of the preparation of the lung for the postnatal demands of gas exchange. Some of the most striking changes occur in the type II pneumocytes as they lose their glycogen and start to produce the lamellated inclusion granules that contain pulmonary surfactant. Premature birth before adequate type II cell maturation results in the neonatal respiratory distress syndrome, which is frequently fatal. We have used serial ultrathin sectioning, electron microscopy, and three-dimensional reconstructions to study the ultrastructural features of maturation of rat type II cells from a single rat each at age gestational day 20 through adult stages. We found evidence over this time span for compartmentation of several secretory granule precursors within type II cells. Changes in the polarization of lamellar bodies were observed over the time period studied. We also found marked gestational changes in the number and morphology of type II cell cytoplasmic processes that perforate the basement membrane. Type II cell mitochondria changed in shape during postnatal development from single, spherical to complex, branched structures. Volume composition obtained from serial sections of a small number of type II cells agreed closely with published morphometric data, indicating that throughout the animal's lifespan, type II cells are a homogenous population.

Growth of ZnO nanotube arrays and nanotube based piezoelectric nanogenerators

2009 ◽  
Vol 19 (48) ◽  
pp. 9260 ◽  
Author(s):  
Yi Xi ◽  
Jinhui Song ◽  
Sheng Xu ◽  
Rusen Yang ◽  
Zhiyuan Gao ◽  
...  
Keyword(s):  
Nanotube Arrays ◽  
Zno Nanotube ◽  
Piezoelectric Nanogenerators
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