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39 results for “photoprotection”
data for paper: Predator-induced defense decreases growth rate and photoprotective capacity in a nitrogen-limited dinoflagellate
<p>this is the data for paper "Predator-induced defense decreases growth rate and photoprotective capacity in a nitrogen-limited dinoflagellate" </p>
Figure 6: Erythema values before and after 10 minutes from application 57 -STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The values of the erythema are relatively low, which indicates that the<br> product is compatible with the skin and has no sensitizing potential (¯gure6).<br> Having a complex composition of ingredients with varying degrees of un-<br> saturation, with the major organic structure, the product is subjected to de-<br> structive processes at the impact of UV radiation and atmospheric oxygen.<br> As a result this organic substances undergo structural changes, embodied in<br> the initial color change, division of chain, forming oxidizing action groups and<br> oxygen free radicals that continue the destructive process. Because of these<br> features, the product was subjected to accelerated tests of thermal and photo<br> destruction. As a result of these tests, the product's characteristics have not<br> changed signi¯cantly.</p>
Figure 2: Variation of the shear stress depending on the speed rate 54-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The evaluation of photodegradation was carried out through the variation<br> of photoprotective factor of the studied product kept 60 minutes under UV<br> radiation at 65±C. The tests revealed the preservation or even a slight increase<br> in the SPF. The use of screen substances in the formulation of photoprotective<br> products results in undesirable sensory characteristics: visible white ¯lm on the<br> skin surface, unpleasant sensation, dry or oily skin after application.</p>
Figure 1: Spreadability (plasticity) Figure-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The physical and chemical methods used to characterize the row<br> materials and the ¯nal products are as following:<br> ² to ¯nd out the amount of inorganic substances (with screening role) the<br> samples were incinerated for two hours at 800±C;<br> ² the quantity of organic substance (with the UV ¯ltering role) was deter-<br> mined by an UV-VIS spectrophotometric method;<br> ² vitamins identi¯cation was done according to the European Pharma-<br> copoeia VI-th edition;<br> ² the photoprotective ability was tested by applying a standard amount of<br> emulsion on a synthetic skin device (0,2g=cm2);<br> ² to test the microbial stability were applied the European Pharmacopoeia<br> VI-th edition stipulations;<br> ² to estimate the compatibility with the human skin a standard quantity<br> of sample (0,2g=cm2) was laid under an occlusive patch.</p>
Figure 4: Determination of hydration of the skin before applying the product-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES
<p>The volunteers who applied the product on the<br> skin appreciated the sensory characteristics such as: easiness of use, pleasant<br> texture, easy absorption without oily traces, appearance, odor and pleasant<br> color (¯gures 4, 5).</p>
Figure 3: Viscosity variation depending on speed rate Table-STUDIES TOWARDS OBTAINING A PHOTOPROTECTIVE DERMO-COSMETIC COMPLEX PRODUCT WITH NATURAL EXTRACTS OF INORGANIC AND ORGANIC SUBSTANCES-
<p>Microbiological characteristics The total number of aerobic germs and fungi<br> was determined by the decimal dilution method or the multiple tube test. For<br> identifying pathogenic species we have used speci¯c tests (table6).<br> The evaluation of photodegradation was carried out through the variation<br> of photoprotective factor of the studied product kept 60 minutes under UV<br> radiation at 65±C. The tests revealed the preservation or even a slight increase<br> in the SPF. The use of screen substances in the formulation of photoprotective<br> products results in undesirable sensory characteristics: visible white ¯lm on the<br> skin surface, unpleasant sensation, dry or oily skin after application.</p>
Photoprotective leaf pigments and chlorophyll fluorescence measurements during a greenhouse drought experiment: An evolutionary perspective on functional diversity in co-occuring willow(salix) species
Thirteen willow (Salix) species occur in southeastern Minnesota and often co-occur within the same wetlands. This high local diversity is challenging to explain since closely related species are often functionally similar and density-dependent interactions such as competition and susceptibility to pests and pathogens should limit their co-occurrence. However, if willow species are partitioning resources, or if they are phylogenetically structured so that closely related species rarely co-occur, then the impact of these density-dependent processes could be reduced. In this study, I examined the role of niche partitioning in maintaining local willow diversity by comparing species physiology in a greenhouse.
Reinvestigating the Photoprotection Properties of a Mycosporine Amino Acid Motif
<p>With the growing concern regarding commercially available ultraviolet (UV) filters damaging the environment, there is an urgent need to discover new UV filters. A family of molecules called mycosporines and mycosporine-like amino acids (referred to as MAAs collectively) are synthesized by cyanobacteria, fungi and algae and act as the natural UV filters for these organisms. Mycosporines are formed of a cyclohexenone core structure while mycosporine-like amino acids are formed of a cyclohexenimine core structure. To better understand the photoprotection properties of MAAs, we implement a bottom-up approach by first studying a simple analog of an MAA, 3-aminocyclohex-2-en-1-one (ACyO). Previous experimental studies on ACyO using transient electronic absorption spectroscopy (TEAS) suggest that upon photoexcitation, ACyO becomes trapped in the minimum of an S1 state, which persists for extended time delays (>2.5 ns). However, these studies were unable to establish the extent of electronic ground state recovery of ACyO within 2.5 ns due to experimental constraints. In the present studies, we have implemented transient vibrational absorption spectroscopy (as well as complementary TEAS) with Fourier transform infrared spectroscopy and density functional theory to establish the extent of electronic ground state recovery of ACyO within this time window. We show that by 1.8 ns, there is >75% electronic ground state recovery of ACyO, with the remaining percentage likely persisting in the electronic excited state. Long-term irradiation studies on ACyO have shown that a small percentage degrades after 2 h of irradiation, plausibly due to some of the aforementioned trapped ACyO going on to form a photoproduct. Collectively, these studies imply that a base building block of MAAs already displays characteristics of an effective UV filter.</p>
The influence of predator community composition on photoprotective traits of copepods
<p>Trait expression of natural populations often jointly depends on prevailing abiotic environmental conditions and predation risk. Copepods, for example, can vary their expression of compounds that confer protection against ultraviolet radiation (UVR), such as astaxanthin and mycosporine-like amino acids (MAAs), in relation to predation risk. Despite ample evidence that copepods accumulate less astaxanthin in the presence of predators, little is known about how the community composition of planktivorous fish can affect the overall expression of photoprotective compounds. Here, we investigate how the (co-)occurrence of Arctic charr (Salvelinus alpinus) and threespine stickleback (Gasterosteus aculeatus) affect the photoprotective phenotype of the copepod Leptodiaptomus minutus in lake ecosystems in southern Greenland. We found that average astaxanthin and MAA contents were lowest in lakes with stickleback, but we found no evidence that these photoprotective compounds were affected by the presence of charr. Furthermore, variance in astaxanthin among individual copepods was greatest in the presence of stickleback and the astaxanthin content of copepods was negatively correlated with increasing stickleback density. Overall, we show that the presence and density of stickleback jointly affect the content of photoprotective compounds by copepods, illustrating how the community composition of predators in an ecosystem can determine the expression of prey traits that are also influenced by abiotic stressors. --</p>
The influence of predator community composition on photoprotective traits of copepods
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Proximity to Photosystem II is necessary for activation of Plastid Terminal Oxidase (PTOX) for photoprotection
<p>TEM and Confocal micrographs images of Arabidopsis thaliana (wt or mutants) and Eutrema salsugineum (wt) plants exposed to control or high light treatments. </p>
Data accompanying "Kinetics of the Xanthophyll Cycle and its Role in the Photoprotective Memory and Response"
<p>Data and code accompanying "Kinetics of the Xanthophyll Cycle and its Role in the Photoprotective Memory and Response".</p>
Evaluate the Photoprotection Efficiency of Sunscreen Formulas Under Visible Light Exposure
ClinicalTrials.gov study NCT06796088. IPD Sharing: NO. Countries: 1. Publications: 1.
The Effectiveness of Topical Silicone Application Combined With Photoprotection in the Development of Scarring Following Blepharoplasty
ClinicalTrials.gov study NCT07387536. IPD Sharing: YES. Countries: 1. Publications: 15.
Ultraviolet and UV-Visible Light Photoprotection for the Treatment of Melasma
ClinicalTrials.gov study NCT01695356. IPD Sharing: Not stated. Countries: 1. Publications: 5.
Determine the Photoprotection Efficacy of Seven Sunscreen Products Under Visible Light Exposure.
ClinicalTrials.gov study NCT06796179. IPD Sharing: NO. Countries: 1. Publications: 1.
Photoprotection Efficacy of Four Sunscreen Formulas Under Visible Light Exposure
ClinicalTrials.gov study NCT06796010. IPD Sharing: NO. Countries: 1. Publications: 1.
Photoprotection Efficacy With Sunscreen Formulas Containing the Cyclic Merocyanine Long-UVA Absorber MCE Under Long-UVA Exposure
ClinicalTrials.gov study NCT04865094. IPD Sharing: YES. Countries: 1. Publications: 1.
XPAND Trial: Enhancing XP Photoprotection Activities - New Directions
ClinicalTrials.gov study NCT03445052. IPD Sharing: NO. Countries: 1. Publications: 2.
Evaluation of the Photoprotection Efficacy of Three Sunscreen Products Under Visible Light Exposure.
ClinicalTrials.gov study NCT06796205. IPD Sharing: NO. Countries: 1. Publications: 1.
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