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In summary, our results indicate that a single dose of OT may promote accurate behavioral responses to potential threat from members of a racial outgroup, thus offering support to the social salience hypothesis. The Photosystem I (PSI) reaction center in cyanobacteria is comprised of ~96 chlorophyll (Chl) molecules, including six specialized Chl molecules denoted Chl1A/Chl1B (P700), Chl2A/Chl2B, and Chl3A/Chl3B that are arranged in two branches and function in primary charge separation. It has recently been proposed that PSI from Chroococcidiopsis thermalis (Nürnberg et al. (2018) Science 360, 1210-1213) and Fischerella thermalis PCC 7521 (Hastings et al. (2019) Biochim. Biophys. Acta 1860, 452-460) contain Chl f in the positions Chl2A/Chl2B. We tested this proposal by exciting RCs from white-light grown (WL-PSI) and far-red light grown (FRL-PSI) F. thermalis PCC 7521 with femtosecond pulses and analyzing the optical dynamics. If Chl f were in the position Chl2A/Chl2B in FRL-PSI, excitation at 740&nbsp;nm should have produced the charge-separated state P700+A0- followed by electron transfer to A1 with a τ of ≤25&nbsp;ps. Instead, it takes ~230&nbsp;ps for the charge-separated state to develop because the excitation migrates uphill from Chl f in the antenna to the trapping center. Further, we observe a strong electrochromic shift at 685 nm in the final P700+A1- spectrum that can only be explained if Chl a is in the positions Chl2A/Chl2B. Similar arguments rule out the presence of Chl f in the positions Chl3A/Chl3B; hence, Chl f is likely to function solely as an antenna pigment in FRL-PSI. We additionally report the presence of an excitonically coupled homo- or heterodimer of Chl f absorbing around 790&nbsp;nm that is kinetically independent of the Chl f population that absorbs around 740&nbsp;nm. The heart contains an abundant fibroblast population that may play a role in homeostasis, by maintaining the extracellular matrix (ECM) network, by regulating electrical impulse conduction, and by supporting survival and function of cardiomyocytes and vascular cells. Despite an explosion in our understanding of the role of fibroblasts in cardiac injury, the homeostatic functions of resident fibroblasts in adult hearts remain understudied. TGF-β-mediated signaling through the receptor-activated Smads, Smad2 and Smad3 critically regulates fibroblast function. We hypothesized that baseline expression of Smad2/3 in fibroblasts may play an important role in cardiac homeostasis. [https://www.selleckchem.com/products/wnt-c59-c59.html selleck chemical] Smad2 and Smad3 were constitutively expressed in normal mouse hearts and in cardiac fibroblasts. In cultured cardiac fibroblasts, Smad2 and Smad3 played distinct roles in regulation of baseline ECM gene synthesis. Smad3 knockdown attenuated collagen I, collagen IV and fibronectin mRNA synthesis and reduced expression of the matricellular protein thrombospondin-1. Smad2 knockdown on the other hand attenuated expression of collagen V mRNA and reduced synthesis of fibronectin, periostin and versican. In vivo, inducible fibroblast-specific Smad2 knockout mice and fibroblast-specific Smad3 knockout mice had normal heart rate, preserved cardiac geometry, ventricular systolic and diastolic function, and normal myocardial structure. Fibroblast-specific Smad3, but not Smad2 loss modestly but significantly reduced collagen content. Our findings suggest that fibroblast-specific Smad3, but not Smad2, may play a role in regulation of baseline collagen synthesis in adult hearts. However, at least short term, these changes do not have any impact on homeostatic cardiac function. Estimates suggest that 43-79% of international travelers may develop travel-related illnesses. Most such illnesses are considered mild and self-limited; however, some are life-threatening. The pretravel consultation is aimed at assessing risks for a range of illnesses, communicating these risks and then providing individualized recommendations and interventions to minimize or manage such risks. The effective consultation is predicated on a well-prepared clinician and motivated traveler, understanding the traveler's perception of and tolerance for risk and providing education applicable to the actual itinerary. Integral to the clinician's preparation is regular review of up-to-date trip-specific recommendations; country-specific information and recommendations are readily available and can now be efficiently accessed. From the infectious diseases perspective, immunizations, malaria chemoprophylaxis, insect repellent use, and travelers' diarrhea and its self-management are cornerstones of the consultation. This review focuses primarily on updating these four topics with recently-published information relevant to adult travelers. Since its introduction in the US market in 2007, the use of Electronic Nicotine Delivery Systems (ENDs), colloquially referred to as E -cigarettes or " Vaping" products has increased dramatically particularly among high school children and young men. With the legalization of marijuana within multiple states in the US and thus coincident change in the public perception of its risk, the availability of multiple tetrahydrocannabinol (THC, the psychoactive agent in marijuana) and cannabidiol (CBD, a non psychogenic agent in marijuana) containing vaping products has also increased tremendously. Since March 2019, an ongoing epidemic of acute lung injury secondary to the use of e-cigarettes with over 2600 cases and 60 deaths have been reported all over the US- which has been termed as E-cigarette or Vaping-product associated lung injury (EVALI). E-cigarette or Vaping-product associated lung injury is defined by the 1) Presence of pulmonary infiltrates in imaging 2) Use of electronic nicotine delivery systems within the previous 90 days and 3) absence of other possible causes such as infection, cardiac, neoplastic or rheumatologic causes. A significant proportion of patients hospitalized with e-cigarette or vaping-product associated lung injury have required admission in the intensive care unit, with mechanical ventilation needed in up to 1/3rd of patients. Corticosteroids, supportive care and further avoidance of vaping products remain the cornerstone of treatment. Although generally associated with an excellent prognosis, older patients and patients with underlying cardiac and pulmonary conditions are at risk for higher mortality and morbidity. This review article aims to describe e-cigarette or vaping-product associated lung injury, its pathogenesis, clinical, radiological manifestations and management.