Clock-Line-Mediated Sisyphus Cooling.

We demonstrate subrecoil Sisyphus cooling using the long-lived ^{3}P_{0} clock state in alkaline-earth-like ytterbium. A 1388-nm optical standing wave nearly resonant with the ^{3}P_{0}→^{3}D_{1} transition creates a spatially periodic light shift of the ^{3}P_{0} clock state. Following excitation on the ultranarrow clock transition, we observe Sisyphus cooling in this potential, as the light shift is correlated with excitation to ^{3}D_{1} and subsequent spontaneous decay to the ^{1}S_{0} ground state.

Efficacy of a lay community health worker (promotoras de salud) program to improve adherence to emollients in Spanish-speaking Latin American pediatric patients in the United States with atopic dermatitis: A randomized, controlled, evaluator-blinded study.

Background: Latin American patients in the United States experience significant health disparities. Community health workers (promotoras de salud) reduce disparities by providing culturally appropriate education. While educational interventions have been studied in atopic dermatitis (AD), a chronic dermatologic condition affecting children, none have evaluated the use of promotoras in Spanish-speaking pediatric patients in the United States.

Coherent optical clock down-conversion for microwave frequencies with 10 instability.

Optical atomic clocks are poised to redefine the Système International (SI) second, thanks to stability and accuracy more than 100 times better than the current microwave atomic clock standard. However, the best optical clocks have not seen their performance transferred to the electronic domain, where radar, navigation, communications, and fundamental research rely on less stable microwave sources. By comparing two independent optical-to-electronic signal generators, we demonstrate a 10-gigahertz microwave signal with phase that exactly tracks that of the optical clock phase from which it is derived, yielding an absolute fractional frequency instability of 1 × 10 in the electronic domain.

Efficacy of stem cell-conditioned medium platelet-rich plasma as an adjuvant to ablative fractional CO laser resurfacing for atrophic post-acne scars: a split-face clinical trial.

Objectives: To explore the impact of using topical stem cell-conditioned medium (SC-CM) after fractional carbon dioxide laser (FCL) combined FCL and platelet-rich plasma (PRP) or FCL alone in treatment of atrophic acne scars.

Methods: Thirty-three patients were randomly divided into two split-face groups. Group I (  =  17) received FCL plus topical SC-CM on one side or FCL plus saline on the other.

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO Sorption Characteristics.

A range of microporous, imide-based polymers were newly synthesized using two-step poly-condensation reactions of bis(carboxylic anhydride) and various aromatic diamines for CO gas capture and storage applications. In this report, we attempted to assess the relative significance of molecular structural aspects through the manipulation of the conformational characteristics of the building blocks of the polymeric structures, the spiro-containing acid anhydride and the aromatic amines, to induce greater intrinsic microporosity and higher surface areas for the resulting solids. Results obtained from this study were thus used to outline a working relationship between the structural diversity of the constructed porous solids and their performance as CO sorbents.

The potential of a graphene-supported porous-organic polymer (POP) for CO electrocatalytic reduction.

A one-pot, bottom-up assembly of a pyrimidine-containing porous-organic polymer (PyPOP) was conducted to homogenously deposit the PyPOP atop unmodified graphene sheets, affording a composite material PyPOP@G. The PyPOP demonstrated an appreciable affinity toward CO capture but was found to be largely insulating, hindering its usage in potential electrochemical conversion of CO. However, its composite with graphene was found to be microporous, with maintained affinity toward CO and furthermore demonstrated significant electrochemical activity toward CO reduction (5 mA cm at -1.