Straussibrahim8070

Non-photochemical quenching (NPQ) of photosystem II (PSII) fluorescence is one of the most important protective mechanisms enabling the survival of phototropic organisms under high-light conditions. A low-efficiency NPQ, characterized by weak NPQ induction capacity and a low level of protective NPQ, was observed in the marine angiosperm Zostera marina, which inhabits the shallow water regions. Furthermore, chlorophyll fluorescence and Western blot analysis verified that the fast-inducted component of NPQ, i.e., the energy-dependent quenching (qE), was not present in this species. In contrast with the lack of PSII antenna quenching sites for qE induction in brown algae and the lack of functional XC in Ulvophyceae belonging to green algae, all the antenna proteins and the functional XC are present in Z. marina. A novel underlying mechanism was observed that the limited construction of the trans-thylakoid proton gradient (ΔpH) caused by photoinactivation of the oxygen evolving complex (OEC) did not induce protonation of PsbS, thus explaining the inability to form quenching sites for qE induction. Although the ΔpH established under light exposure activated violaxanthin (V) de-epoxidase enzyme to catalyze conversion of V via antheraxanthin (A) and then to zeaxanthin (Z), the quenching capacity of de-epoxidized pigment was weak in Z. marina. We suggest that the low-efficiency NPQ was conducive to efficiently utilize the limited electrons to perform photosynthesis, resisting the adverse effect of OEC photoinactivation on the photosynthetic rate.In photosynthetic organisms, it is recognized that the intracellular redox ratio of NADPH is regulated within an appropriate range for the cooperative function of a wide variety of physiological processes. However, despite its importance, there is large variability in the values of the NADPH fraction [NADPH/(NADPH + NADP+)] quantitatively estimated to date. In the present study, the light response of the NADPH fraction was investigated by applying a novel NADP(H) extraction method using phenol / chloroform / isoamyl alcohol (PCI) in the cyanobacterium Synechocystis sp. PCC 6803. PACAP 1-38 cAMP agonist The light response of NADP(H) observed using PCI extraction was qualitatively consistent with the NAD(P)H fluorescence time course measured in vivo. Moreover, the results obtained by PCI extraction and the fluorescence-based methods were also consistent in a mutant lacking the ability to oxidize NAD(P)H in the respiratory chain, and exhibiting a unique NADPH light response. These observations indicate that the PCI extraction method allowed quantitative determination of NADP(H) redox. Notably, the PCI extraction method showed that not all NADP(H) was oxidized or reduced by light-dark transition. Specifically, the fraction of NADPH was 42% in the dark-adapted cell, and saturated at 68% in light conditions.In the USA, although college-aged populations are at the greatest risk for initial infection with human papillomavirus (HPV), they are one of the age-based populations with lower HPV vaccine rates, largely due to their lack of perceived need to vaccinate against HPV. Health communication campaigns can help address this perception. This research identifies college students' preferred digital media channels for future HPV vaccine communication campaigns. We conducted qualitative small group interviews with 28 students from one large southwestern university. We used an inductive approach to hand-code interview transcripts, develop a coding structure, and analyze themes that emerged from the data. More than half of the study participants had never heard of the HPV vaccine before participating in a small group interview. When asked how they prefer to receive information about the vaccine, students more often recommended creating educational videos featuring healthcare providers and other college students and sharing them on YouTube. Some students recommended creating and posting health information memes and infographics to Instagram to disseminate the most critical information students need to make an informed decision to receive the vaccine. Given the prominent role of social media and the popularity of video-sharing and image-sharing sites, health educators and communicators should utilize these technologies to promote the HPV vaccine, a cancer prevention resource.Human papillomavirus (HPV) vaccination can prevent numerous cancers, yet uptake remains low for adolescents. Given disproportionate burden of cancers among African Americans, it is important to identify factors that influence HPV vaccination decisions among African American parents, specifically the role and preferences of vaccine campaign messages. The objectives of this study were to (1) identify the predictors of parents' decisions to get their children vaccinated against HPV, (2) assess parents' evaluation of current HPV vaccination campaign messages, and (3) uncover message strategies or themes parents consider to be effective and motivating to vaccinate their children against HPV. Focus groups were conducted with African American mothers and fathers (n = 18) in person. Several themes emerged regarding HPV vaccine acceptability including the desire to be informed, the unfamiliarity of vaccination, and mistrust toward government, pharmaceutical companies, and healthcare providers. Parental review of existing campaign messages highlighted the importance of clarifying risks and benefits of vaccination, including cancer prevention, and the preference for straightforward language. When brainstorming strategies to craft effective messages, parents highlighted need for the inclusion of diverse groups across race, gender, and age. Additionally, parents recommended clear language on side effects, eligibility, and additional resources for further information. Our findings highlight concerns and potential strategies to promote HPV vaccination tailored to African American parents and their children. Targeted interventions to increase vaccination need to consider the importance of building trust and representation in health promotional materials. Considerations for how messages were shared were also discussed such as physical locations, word of mouth, and social media.