In this study we report the preparation of a new mechanically interlocked molecule formed by self-aggregation two metallotweezers composed pyrene-imidazolylidene gold(I) arms and pyridine-centered pentacyclic bis-alkynyl linker. The nature arises from presence bulky tert-butyl groups attached to sides pyrene moieties tweezer, which act as stoppers avoiding dissociation self-aggregated metallotw...

Nitrogen-doped carbon nanotubes consist of many cup-shaped graphitic compartments termed as nitrogen-doped carbon nanotube cups (NCNCs). These as-synthesized graphitic nanocups from chemical vapor deposition (CVD) method were stacked in a head-to-tail fashion held only through noncovalent interactions. Individual NCNCs can be isolated out of their stacking structure through a series of chemical...

Nanoscale muscle-like materials have aroused great interest as they may provide controllable mechanical operations by artificial actuations. Molecular designs to achieve the desired motion at the macroscopic scale in experiments require atomic level understanding. By systematic quantum chemical and molecular dynamics calculations we reveal that the length change is not only due to the linear te...

Activated partial thromboplastin times (APTT) for monitoring heparin therapy for venous thromboembolism tended to be inappropriately short if blood was collected in commercially available evacuated glass tubes. Five types of evacuated tubes marketed under the trade names Vacutainer and Venoject were examined. The APTT of heparinised blood collected in these tubes correlated poorly (r = 004 to r...

Vibrational triboelectric nanogenerators (V-TENG) can be used to harvest broadband vibration energy due the nonlinear impact force induced by a stopper. However, V-TENGs with single stopper have limited bandwidth and surface charge density, which has their application in wideband harvesting. Herein, V-TENG two stoppers pumping effect is proposed for frequency band broadening density enhancement...

Linear gas stoppers are widely used to convert high-energy, rare-isotope beams and reaction products into low-energy with small transverse emittance energy spread. Stopping of the high-energy ions is achieved through interaction a buffer gas, typically helium, generating large quantities He$^+$/e$^-$ pairs. The Advanced Cryogenic Gas Stopper (ACGS) was designed for fast, efficient stopping extr...

The presence of guaiacol in cork stoppers is responsible for some cases of cork taint causing unpleasant alterations to wine. We have performed a characterization of the cork-associated microbiota by isolating 55 different microorganisms: eight yeast, 14 filamentous fungi or molds, 13 actinomycetes and 20 non-filamentous bacteria. A screening for degradation of vanillic acid and guaiacol produc...

This study compared respite users with stoppers and nonusers in the Health Resources and Services Administration-funded Alzheimer's disease demonstration grant in the State of Maryland. Of those accepted into the program, only 54% participated for at least 6 months. The primary reasons for stopping were the death or institutionalization of the relative, while those not using respite services fe...