scholarly journals Active gels, heavy tails, and the cytoskeleton

Soft Matter ◽  
2021 ◽  
Author(s):  
Daniel Swartz ◽  
Brian Camley
Keyword(s):  
Molecular Motors ◽  
Heavy Tails ◽  
Active Material ◽  
Material Objects ◽  
Diffusive Behavior

The eukaryotic cell's cytoskeleton is a prototypical example of an active material: objects embedded within it are driven by molecular motors acting on the cytoskeleton, leading to anomalous diffusive behavior....

scholarly journals Anomalous Diffusive Behavior in Intracellular Transport Mediated by Molecular Motors

2010 ◽  
Vol 98 (3) ◽  
pp. 723a
Author(s):  
Luciana Bruno ◽  
Valeria Levi ◽  
Maia Brunstein ◽  
Marcelo Despósito
Keyword(s):  
Molecular Motors ◽  
Intracellular Transport ◽  
Diffusive Behavior

Heavy Tails of Discounted Aggregate Claims in the Continuous-Time Renewal Model

2007 ◽  
Vol 44 (02) ◽  
pp. 285-294 ◽  
Author(s):  
Qihe Tang
Keyword(s):  
Asymptotic Formula ◽  
Continuous Time ◽  
Heavy Tails ◽  
Tail Behavior ◽  
Renewal Model ◽  
Discounted Aggregate Claims ◽  
Aggregate Claims ◽  
Tail Asymptotic

We study the tail behavior of discounted aggregate claims in a continuous-time renewal model. For the case of Pareto-type claims, we establish a tail asymptotic formula, which holds uniformly in time.

High Resolution Transmission Electron Microscopy of an automobile catalytic converter

1990 ◽  
Vol 48 (4) ◽  
pp. 242-243
Author(s):  
Jan-Olle Malm ◽  
Jan-Olov Bovin
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Catalytic Converter ◽  
Active Material ◽  
Image Intensifier ◽  
High Resolution Electron Microscopy ◽  
Detailed Knowledge ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Atomic Surface

Understanding of catalytic processes requires detailed knowledge of the catalyst. As heterogeneous catalysis is a surface phenomena the understanding of the atomic surface structure of both the active material and the support material is of utmost importance. This work is a high resolution electron microscopy (HREM) study of different phases found in a used automobile catalytic converter.The high resolution micrographs were obtained with a JEM-4000EX working with a structural resolution better than 0.17 nm and equipped with a Gatan 622 TV-camera with an image intensifier. Some work (e.g. EDS-analysis and diffraction) was done with a JEM-2000FX equipped with a Link AN10000 EDX spectrometer. The catalytic converter in this study has been used under normal driving conditions for several years and has also been poisoned by using leaded fuel. To prepare the sample, parts of the monolith were crushed, dispersed in methanol and a drop of the dispersion was placed on the holey carbon grid.

Video-microscopic measurement of cell-substratum traction forces generated by locomoting keratocytes

1993 ◽  
Vol 51 ◽  
pp. 188-189
Author(s):  
Tim Oliver ◽  
Michelle Leonard ◽  
Juliet Lee ◽  
Akira Ishihara ◽  
Ken Jacobson
Keyword(s):  
Silicone Rubber ◽  
Molecular Motors ◽  
Video Frame ◽  
Traction Forces ◽  
Cell Traction Forces ◽  
Latex Beads ◽  
Cell Traction ◽  
Local Cell ◽  
Microscopic Measurement ◽  
Kinetics Of

We are using video-enhanced light microscopy to investigate the pattern and magnitude of forces that fish keratocytes exert on flexible silicone rubber substrata. Our goal is a clearer understanding of the way molecular motors acting through the cytoskeleton co-ordinate their efforts into locomotion at cell velocities up to 1 μm/sec. Cell traction forces were previously observed as wrinkles(Fig.l) in strong silicone rubber films by Harris.(l) These forces are now measureable by two independant means.In the first of these assays, weakly crosslinked films are made, into which latex beads have been embedded.(Fig.2) These films report local cell-mediated traction forces as bead displacements in the plane of the film(Fig.3), which recover when the applied force is released. Calibrated flexible glass microneedles are then used to reproduce the translation of individual beads. We estimate the force required to distort these films to be 0.5 mdyne/μm of bead movement. Video-frame analysis of bead trajectories is providing data on the relative localisation, dissipation and kinetics of traction forces.

ISOLEMENT ET QUELQUES CARACTERISTIQUES D'UNE GONADOTROPHINE URINAIRE DE MÉNOPAUSE HOMOGÈNE A L'ELECTROPHORÈSE

1960 ◽  
Vol XXXV (II) ◽  
pp. 225-234 ◽  
Author(s):  
R. Bourrillon ◽  
R. Got ◽  
R. Marcy
Keyword(s):  
Sialic Acid ◽  
Histological Study ◽  
Active Material ◽  
Biologically Active ◽  
New Method ◽  
Female Rats ◽  
Mouse Uterus ◽  
Highly Active ◽  
Zone Electrophoresis ◽  
Human Menopausal Gonadotrophin

ABSTRACT A new method for preparation of Human Menopausal Gonadotrophin involves successively alcoholic precipitation, kaolin adsorption and chromatography on ion exchangers. A highly active material is obtained which corresponds to 1 mg per litre of urine and has an activity of 1 mouse uterus unit at a dose of 0.003 mg. This gonadotrophin possesses both follicle stimulating and luteinizing activities in hypophysectomized female rats, by histological study. It contains 13 % hexose, 10% hexosamine and 8.5 % sialic acid. A further purification, by zone electrophoresis on starch, gives a final product, biologically active at 0.001 mg, which behaves as an homogenous substance in free electrophoresis with mobility −4.76 × 10−5 at pH 8.6.

TRANSFORMASI DIALEKTIKA SEGITIGA: POSISI DAN PERAN DALAM KAJIAN INTEGRASI AGAMA, SAINS, DAN TEKNOLOGI

1970 ◽  
Vol 19 (2) ◽  
pp. 314-333
Author(s):  
Sarno Hanipudin
Keyword(s):  
Research Methods ◽  
Science And Religion ◽  
Fundamental Difference ◽  
Material Objects ◽  
Religion And Science ◽  
Empirically Supported

This paper is intended to describe how the integration of religion and science is done through the practice of PAI learning. This was done because there is a strong presumption in the wider community who say that religion and science are the two entities that can not be met. Both have their respective territories, separated from each other, in terms of formal-material objects, research methods, criteria of truth, the role played by scientists. There is also a view that science and religion stand at their respective position, because science rely on empirically supported data to ascertain what is real and what is not, contrary religion ready to accept the supernatural and certainly not only be based on tangible variables of faith and the belief that religion and science must coexist independently of each other, because even though there are similarities in their mission, the fundamental difference between the two present a conflict that will resonate on each core. Tulisan ini ditujukan untuk mendeskripsikan bagaimana integrasi agama dan sains dilakukan melalui praktik pembelajaran PAI. Hal itu dilakukan karena ada anggapan yang kuat dalam masyarakat luas yang mengatakan bahwa agama dan ilmu adalah dua entitas yang tidak dapat dipertemukan. Keduanya mempunyai wilayah masing-masing, terpisah antara satu dan lainnya, baik dari segi objek formalmaterial, metode penelitian, kriteria kebenaran, peran yang dimainkan oleh ilmuwan. Ada juga yang memandang bahwa sains dan agama berdiri pada posisinya masingmasing, karena bidang ilmu mengandalkan data yang didukung secara empiris untuk memastikan apa yang nyata dan apa yang tidak, agama sebaliknya siap menerima yang gaib dan tidak pasti hanya didasarkan pada variabel berwujud dari iman dan kepercayaan bahwa agama dan sains harus hidup berdampingan independen satu sama lain, sebab meskipun ada kesamaan dalam misi mereka, perbedaan mendasar antarakeduanya menyajikan sebuah konflik yang akan beresonansi pada inti masingmasing.

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