A cooling chain is described which enables the transfer of frozen hydrated biological specimens (ultrathin cryosections as well as about 1 micrometer thick cultured cells) from a cryoultramicrotome into a scanning transmission electron microscope with a field emission gun. Transfer is done at 118 K, specimen temperature in the microscope is 165 K. Sublimation processes are controlled visually and by mass spectrometry. Electron micrographs and X-ray microanalytical spectra of cryofixed unstained tissue culture cells and rat liver tissue sections are described and discussed. Contamination of the specimen is much reduced by use of the cold stage.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0304-3991(81)90058-9 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The metabolome of Sphingobium chinhatense IP26 exposed to chlorinated paraffins - Efficient data analysis with RASER.
Chemosphere
January 2025
Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Advanced Analytical Technologies, Überlandstrasse 129, CH-8600, Dübendorf, Switzerland. Electronic address:
The universe of possible chloro-paraffin (CP) structures is a complex one. Even the world of short-chain CPs (SCCPs) is large, containing thousands of constitutional isomers and stereoisomers. We investigated a technical SCCP mixture (Hordalub 80, Vantage Leuna, m = 56%) and found 33 CP-homologues in this material with carbon- (n) and chlorine-numbers (n) varying from 10 to 13 and 4-12, respectively.
View Article and Find Full Text PDFNano- and meso-scale aggregation of poly(N-isopropylacrylamide) below the lower critical solution temperature: A wide-angle dynamic light scattering study.
J Colloid Interface Sci
January 2025
Nanoscale Biophotonics Laboratory, University of Galway, University Road, Galway H91 TK33 Ireland. Electronic address:
Poly-N-isopropylacrylamide (PNIPAm), a thermorresponsive polymer, highly soluble in water below its lower critical solution temperature (LCST), is widely used in biomedical applications like drug delivery. Being able to measure PNIPAm size and aggregation state in solution quickly, inexpensively, and accurately below the LCST is critical when stoichiometric particle or molecular ratios are required. Dynamic light scattering (DLS) is probably the most widely available, and inexpensive nanoparticle sizing technique, but there are limitations with respect to sample polydispersity.
View Article and Find Full Text PDFModification of Liposomal Properties by an Engineered Gemini Surfactant.
Langmuir
January 2025
Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, United States.
Lipid membranes form the primary structure of cell membranes and serve as configurable interfaces across numerous applications including biosensing technologies, antifungal treatments, and therapeutic platforms. Therefore, the modification of lipid membranes by additives has important consequences in both biological processes and practical applications. In this study, we investigated a nicotinic-acid-based gemini surfactant (NAGS) as a chemically tunable molecular additive for modulating the structure and phase behavior of liposomal membranes.
View Article and Find Full Text PDFBulk thermally conductive polyethylene as a thermal interface material.
Mater Horiz
January 2025
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA.
As the demand for high-power-density microelectronics rises, overheating becomes the bottleneck that limits device performance. In particular, the heterogeneous integration architecture can magnify the importance of heat dissipation and necessitate electrical insulation between critical junctions to prevent dielectric breakdown. Consequently, there is an urgent need for thermal interface materials (TIMs) with high thermal conductivity and electrical insulation to address this challenge.
View Article and Find Full Text PDFThree-dimensional scapular kinematics during commonly used rehabilitation exercises in patients 12 weeks after Reversed Shoulder Arthroplasty.
J Shoulder Elbow Surg
January 2025
Department of Rehabilitation Sciences, Faculty of Medicine and Health Sciences, Ghent University, Campus UZ Gent, Ghent, Belgium.
Background: Reversed shoulder arthroplasty (rTSA) is often used to restore functionality in patients with joint arthropathy and dysfunctional rotator cuff. As rTSA changes the biomechanical properties of the shoulder, an altered movement pattern of arm and scapula is to be expected. Previous studies focused on changes of the scapulohumeral rhythm during functional elevation tasks.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!