Forest Lakes Research Articles

The Role of Fractional Radiofrequency in Long-term Acne Remission and Reduction of Acne Scar Load.

Acne is an inflammatory skin disease afflicting the majority of the world's population at some point in their lifetime, and is seen to be chronic in about 50% of cases. Acne leads to significant social withdrawal, depression, and disfiguring scars in many cases. Available treatments are characterized by high rates of relapse, dangerous side effects, and social stigma, which often leads to poor patient compliance and treatment failure. The aim of this article was to discuss and share the authors' experiences utilizing fractional radiofrequency (RF) (Morpheus8; InMode Ltd., Lake Forest, CA) in the treatment of both active acne and acne scars. A retrospective review was conducted comparing 3 treatment modalities. In total, 356 patients received acne scar treatments. The cohort comprised a high-dose isotretinoin topical therapy series (n = 128, 36%), a 6-session ablative laser series (n = 89, 25%), and a 3-session fractional RF microneedling series (n = 139, 44). Of the patients with extended 3-year follow-up, the relapse rates were: isotretinoin group, 36 of 54 (67%); laser group, 12 of 16 (75%), and fractional RF microneedling group, 7 of 29 (24%). In treating older acne scars, fractional RF microneedling technology has served as an effective tool to tighten skin and fill in atrophic scars when used in conjunction with other techniques. This technology is very effective and very safe for treating all skin types with acne and acne scars.

Land use, hydroclimate and damming influence organic carbon sedimentation in a flood pulse wetland, Malaysia

ABSTRACTWater bodies located in floodplains and tropical forests are known to be important carbon stores, but many are subjected to intensive pressures from damming, land use and climate changes. Sedimentary records preserve long‐term archives for understanding how such changes affect the quantity and quality of carbon stores. We analysed sediment cores from seven sites across a flood‐pulse multi‐basin wetland, Tasik Chini in Peninsular Malaysia (for percentage LOI550, sediment density and spheroidal carbonaceous particles), and conducted more analyses on three 210Pb‐dated cores (X‐ray fluorescence of elements, grain size analysis, carbon isotopes, C/N ratios, carotenoid pigments) to gain an understanding of the drivers of organic carbon accumulation rates (OCARs) since 1860 ce. The median OCAR of 85 g m−2 a−1 for the basin since 1945 ce was higher than in other floodplain and temperate lakes and in line with other tropical forest lakes. However, we found evidence for different mechanisms of OC deposition across the basin. In ‘autochthonous mode’, the site with minimal local land disturbance had lowest OCARs and OC was derived mainly from autochthonous production, which rose slightly around 1940 ce when regional land disturbance increased nutrient influx to the basin. The site with the most long‐term and intensive land disturbance through forest removal (1940s) and then conversion to rubber and oil palm farming (1980s) functioned mainly in ‘allochthonous mode’; that is, increases in OCARs after 1940 ce were driven by deposition of soil‐derived OC. The highest OCARs were in the basin that was converted to oil palm after the 1980s and had increased iron mining activity in the 2000s; because this site was located distal from the flood pulse and became increasingly hydrologically disconnected after a low rainfall period in the 1970s, the lake responded strongly in ‘autochthonous mode’, through encroachment of fringing swamp, the spread of benthic algae and macrophytes, and efficient sediment retention. Weir installation in 1995 ce raised water levels and increased lentic conditions, promoting autochthonous OC production and sedimentation across all basins. The long‐term fate of this more recently deposited OC remains uncertain because it is more labile. Overall Tasik Chini has responded strongly to land use changes since at least the 1940s, earlier than anticipated in this region of Southeast Asia, and the sedimentary proxies indicate large changes in the ecosystem function and capacity for C storage over the past ca. 80 years. Most of these shifts have increased OC accumulation by strengthening autochthonous production or allochthonous OC fluxes, but the implications for other aspects of the C cycle, including catchment soil C loss and greenhouse gas production, need to be accounted for when evaluating the overall impacts of land and hydrological disruption.

6721 Short-Term Responses of Serum 25-Hydroxyvitamin D to Weekly Calcifediol or Cholecalciferol in Healthy Subjects

Abstract Disclosure: R.B. Caldeira: None. A.S. Nunes: None. F.Z. Cazzetta: None. M.S. Medeiros: None. L.B. Oliveira: None. M.P. Bandeira: None. F.F. Bandeira: None. Introduction: Recent studies have shown that oral calcifediol (CAL) induces faster serum 25-hydroxyvitamin D (25OHD) increases than cholecalciferol (CHO) as demonstrated in some studies on SARS-Cov2 infection. It is hypothesized that this rapid elevation is due to the unique mode of intestinal absorption of CAL to the portal vein system in comparison with CHO which is absorbed mainly by the lymphatic route. Data on weekly administration of calcifediol are still scarce. The aim of the present study was to compare serum 25OHD responses in the short term (30 days) to weekly doses of CAL or CHO in healthy subjects. Methods and Results: We studied 35 subjects (34% men, mean age 24.6 ± 4.6 years, BMI 22.9 ± 2.9 kg/m², waist circumference 74.7 ± 6.5 cm, SBP 111.1 ± 12.7 mmHg, and DBP 73.1 ± 9.1 mmHg) who were randomized to receive weekly oral CAL 70 mcg (18 subjects) or CHO 350 mcg (14,000 IU, 17 subjects). Doses were chosen based on the 2000 IU/day potency equivalence. Patients were matched for age, gender, BMI, and BP. They were contacted weekly to confirm medication adherence. Serum 25OHD concentrations were measured before administration of both agents and 24 hours after the last dose, using an immunochemiluminescent assay (Abbott Diagnostics, Lake Forest, IL, USA) with a detection range from 4.9 to 151.3 ng/ml. At baseline serum 25OHD was 32.1 ±8.8 vs 33.1 ± 6.6 in CAL and CHO groups respectively (p=0.691). In CAL group 8 subjects had serum 25 OHD < 30 ng/mL (1 subject had 14.7 ng/mL) and in the CHO none had serum 25OHD below 20 ng/mL and 5 subjects had levels between 20 and 30 ng/mL. After 1 month, serum 25OHD levels rose significantly 3.3 times more with CAL than with CHO (+29.61 ± 7.39 ng/mL vs. 9.00 ± 3.50 ng/mL; p < 0.001). In CHO group one subject remained with 25OHD below 30 ng/mL after the intervention. Conclusion: We found a rapid and robust elevation of serum 25OHD levels with CAL compared to CHO at similar potency doses. This may have clinical implications for conditions in which there is a need for immediate availability of 25OHD to peripheral tissues. Presentation: 6/2/2024

Spatial distribution and fixed-precision sequential sampling plans for Popillia japonica (Coleoptera: Scarabaeidae) adults in primocane raspberry: influence of foliar insecticides.

The Japanese beetle, Popillia japonica Newman (Coleoptera: Scarabaeidae), an invasive species from northern Japan, was first detected in Minnesota in 1968. According to fruit growers and the Minnesota Department of Agriculture, population size and feeding damage has been an increasing concern since 2010. Based on trap-catch data, populations have recently exceeded 4,000 beetles/trap/week during July-August near raspberry fields, and can increase by an order of magnitude within 7-10 days. The primary goals of this study were to assess the spatial distribution of P. japonica adults in raspberry, and to develop and validate a practical fixed-precision sequential sampling plan for grower use. Taylor's Power Law (TPL) regression was used to characterize the beetle's spatial pattern in research plots and commercial fields, either with or without insecticide applications. We then used Green's plan to develop an enumerative sequential sampling plan to estimate P. japonica density in primocane raspberry. Beetle population data were collected at two locations in southern Minnesota, including the Rosemount Research and Outreach Center, and a commercial field near Forest Lake. The TPL results, via slope comparisons, indicated no significant differences in P. japonica spatial pattern between insecticide treated plots versus untreated plots, or among 4 different insecticides (P>0.05). Utilizing all spatial pattern data, we characterized the distribution of P. japonica beetles to be highly aggregated in raspberry, with TPL slopes ranging from b = 1.38 to 1.55; all slopes were found to be >1.0. Although the slopes were not significantly different, we accounted for variability in spatial pattern by using 33 independent data sets, and the Resampling for Validation of Sampling Plans (RVSP) model to validate a sampling plan with a final average precision level of 0.25 (SEM/mean), recommended for integrated pest management (IPM) purposes. The final sampling plan required an average sample number of only 15, 1-m-row samples, while providing high relative net precision (RNP), and thus a cost-effective, efficient sample plan for growers.

Minimally Invasive Ultrasound Guided Percutaneous Fasciotomy for the Treatment of Chronic Plantar Fasciitis

Category: Midfoot/Forefoot; Hindfoot Introduction/Purpose: Plantar fasciitis is one of the most common causes of foot pain among the United States’ population. There are several treatment options including both nonoperative and operative approaches. Recently, minimally invasive (MIS) percutaneous plantar fasciotomy has come on the market with anecdotally good patient outcomes but limited published literature. This study aimed to review the patient outcomes, complications, and revision rates in patients undergoing MIS ultrasound-guided percutaneous plantar fasciotomy for the treatment of chronic plantar fasciitis. Methods: A multicenter retrospective chart review of patients undergoing MIS ultrasound-guided percutaneous fasciotomy using the Tenex device (Trice Medical, Lake Forest California) from January 2020 to December 2022 was performed. The main data points collected were patient-reported outcomes, follow-up times, revision surgery, and complications. Continuous variables were defined as a mean and were compared using Paired Student’s T-Test. Multivariable linear regression analysis was utilized to determine specific factors that influenced outcomes when controlling for confounding variables. All P< 0.05 were considered significant. Results: There were 56 (42 female/14 male) patients that underwent 60 procedures. The average age and BMI were 48.6 years (range 19–80), and 33.2 kg/m2 (range 19.7–58.6), respectively. There were two (3.3%) complications of wound-healing delays and one (1.7%) complication of nerve damage noted. There were two (3.3%) revisions. The average follow-up was 27 months (range 13.3–48.6). The average improvement in pain, physical function, and mobility Patient-Reported Outcomes Measurement Information System (PROMIS) scores were 5.2 (range: -5.1–25.8), P< 0.01), 3.6 (range -7–30.7, P=0.01), and 3.1 (range -6–25, P=0.01). Overall, over 90% of patients had no to minimal pain at the final follow-up. No specific demographic factors were significantly associated with an improvement in PROMIS scores or overall pain at final follow-up. Conclusion: MIS ultrasound-guided plantar fasciotomy appears to be a reliable surgical treatment option for chronic plantar fasciitis with high patient satisfaction, minimal complications, and low revision rates.

Cold mountain stream chironomids (Diptera) of the genus Diamesa indicate both historical and recent climate change.

Chironomids of the genus Diamesa (Meigen, 1835, Diptera: Chironomidae) inhabit cold, oxygen-rich running waters. We have investigated the presence of Diamesa and other freshwater macroinvertebrates at 22 stream sampling sites in 3 European high mountain regions (the Central Pyrenees, the Ötztal Alps, and the Tatra Mountains) to establish suitable temperature conditions for Diamesa dominance. It has been generally accepted that their high abundance was linked to the presence of glaciers; however, we have shown that in the Tatra Mountains, where there are no glaciers, the conditions for the dominance of Diamesa species are created due to permanent snowfields, the geographical orientation of the valley and shading by the surrounding high peaks. The historical connection of Diamesa to glaciers was investigated from the paleolimnological records of subfossil chironomid assemblages from the Bohemian Forest, where glaciers disappeared before or during the Late Glacial period. As expected, water temperature seems to be the main driver of Diamesa distribution, and we determined that the relative abundance of Diamesa species was significantly higher at the sites with a mean July water temperature below 6.5 °C. The Diamesa-dominated stream communities seems to be endangered due to ongoing climate warming and this assumption is supported by our paleolimnological results from the Bohemian Forest lakes, where Diamesa has disappeared due to warming of lake inflows at the beginning of the Holocene. These findings strengthen the former suggestions that some Diamesa species could be used as an indicator for tracking recent environmental changes in vulnerable ecosystems of cold mountain streams.

Existing dataset suggests lakes in agricultural watersheds are warming faster than urban or forested lakes

Existing dataset suggests lakes in agricultural watersheds are warming faster than urban or forested lakes

Radiofrequency and Electrical Muscle Stimulation: A Synergistic Treatment That Achieves Lipolysis and Circumferential Waist Reduction in Noninvasive Body Contouring.

Surgeons and providers in aesthetic medicine seek noninvasive devices that can be utilized for safe, efficient, and effective body contouring. Patient demand has propelled the development of novel devices that can simultaneously improve skin laxity, adipolysis along with stimulation of muscle hypertrophy. To determine the efficacy of body contouring after 3 treatments using the noninvasive Transform (InMode, Lake Forest, CA) device. A prospective, multicenter study was performed. Outcomes evaluated include: standardized caliper and ultrasound measurements of abdominal skin/soft-tissue thickness, waist circumference, histologic evaluation, patient comfort, and satisfaction assessments. Forty-four patients were successfully enrolled in the study and completed the series of 3 treatments which involved combined electrical muscle stimulation (EMS) and noninvasive bipolar radiofrequency (RF). Abdominal ultrasound measurements reveal a decrease in soft-tissue thickness (average 3.1 mm; P = .001), there was a significant decrease in caliper measurements of periumbilical skin thickness (P < .003), and the average reduction of abdominal circumference was 1.9 cm (P < .0001) 3 months after the treatment series. Histology confirmed subcutaneous adipolysis without damaging the dermal layer. Patients reported a high degree of satisfaction with the overall result (P = .003) and that each of the 3 treatments were progressively more comfortable (P < .005). This study demonstrates that a series of simultaneous noninvasive RF with EMS treatments to the abdomen decreases subcutaneous soft-tissue thickness of the treated area. These comfortable treatments ultimately result in a high degree of patient satisfaction at 3 months.

Brownification increases the abundance of microorganisms related to carbon and nitrogen cycling in shallow lakes

Brownification in aquatic ecosystems under global change has attracted attention. The composition and quantity of dissolved organic matter transported from various land use types to lakes differ significantly, causing varying ecological effects of lake brownification by region. Bacterial communities make a significant contribution to the material cycle of ecosystems and are sensitive to environmental changes. In this study, a series of mesocosm systems were used to simulate forest lakes and urban lakes with different degrees of brownification, and a high-throughput amplicon sequencing technique was used to explore the changes in the composition, structure, and function of bacterial communities in shallow lakes undergoing brownification. Principal coordinate analysis (PCoA) and Jensen‒Shannon distance typing analysis both indicated significant differences in bacterial communities between forest lakes and urban lakes. The α diversity of bacterial communities in urban lakes increased with the degree of brownification. However, whether forest lakes or urban lakes, brownification increased the abundance of carbon cycling-related bacterial phyla (Proteobacteria, Poribacteria, and Chloroflexi) and nitrogen cycling-related bacterial genera (Microbacteriaceae, Limnohabitans, Comamonadaceae, Bacillus, and Rhizobiales_Incertae_Sedis). Additionally, the carbon and nitrogen cycling functions of bacterial communities in forest lakes are dominant, while those in urban lakes are dominated by functions related to light. Our study has preliminarily revealed that lake brownification promotes the growth of carbon and nitrogen cycling microorganisms, providing a new paradigm for understanding the response of lake ecosystems in different catchment areas to environmental changes and the carbon and nitrogen cycling processes in shallow lake ecosystems.

Using the Transtheoretical Model of Behavior Change to Explore Forest Landowner Perspectives on Water Quality

Family forest owners (FFOs) are critical stakeholders in ensuring many conservation outcomes, including improved water quality. In the highly forested Lake Champlain basin of Vermont, FFOs likely play a particularly important role in addressing water quality impairment. This study focused on FFOs’ thinking and decision-making around management practices on their land. Based on a dataset of 28 interviews collected using a semi-structured interview approach, the interviews were qualitatively coded and analyzed using the Transtheoretical Model of behavior change (TTM) framework. Our findings suggest that interviewed landowners were concerned about basin water quality but generally not aware of the connection between watershed health and actions taken on their particular forest parcel. We further describe how three TTM Processes of Change (helping relationships, consciousness raising, and environmental re-evaluation) may influence landowners’ decisions to manage their forests with water quality in mind. Our results suggest pathways for the design and targeting of behavioral change interventions based on the TTM that should inform landowner outreach as well as further research.

Факторы зональности и их влияние на зоопланктон озёр Среднего Поволжья

We analyzed the results of studies of 176 different types of lakes in the Middle Volga region (Russia). The impact of various environmental factors (morphometric parameters of lakes, physical and chemical indicators of water) on the lakes’ zooplankton communities of two landscape-geographical zones (forest and forest-steppe) was studied. The aim of the work was to identify the biodiversity of pelagic zooplankton and to assess the role of environmental factors in the development of zooplankton communities. Statistical studies included the calculation of the Spearman and Pearson correlation coefficients, data analysis using linear and logistic regression methods. We identify 230 species of zooplankton, including Rotifera – 107 (45.6%), Cladocera – 76 (33.6%), Copepoda – 47 (20.8%). Forest lakes show more species in the sample and higher quantitative indices compared to the forest-steppe lakes. The values of these indicators are determined by a complex of factors, the most important of which are the morphometric parameters of the lakes, the content of mineral nitrogen, oxygen, water mineralization and its determining ions. The depth of the reservoir can increase in the number of species in the sample or decrease them. Zooplankton quantification decreases as maximum depth increases. In deep-water lakes they are usually lower than in wellwarmed high-trophic and shallow ones. High mineralization and higher content of nutrients reduce the number of species in the sample and quantitative indicators of zooplankton. The increase in mineral nitrogen concentration and average ranking index is negatively related to zooplankton abundance, which is due to the occurrence of negative effects associated with anthropogenic eutrophication. Local conditions determine the composition and structure of zooplankton communities within the landscape-climatic zones, which determine the ionic composition of water and the concentration of major ions.

The lake’s image in the artistic worldview of the Northern text of Russian literature for children

INTRODUCTION. For the first time, the works of the Northern Text of Russian literature for children, in which the lake’s image arises, are systematized. The purpose of the study is to consider the artistic and semantic features of the leitmotif image of the lake in the context of the specifics of the artistic world of the North. The objectives of the research are to identify the main mythopoetic and realistic characteristics of the lake’s image in the works of the Northern text for children; to determine the motives and images with which it interacts as a structural element of the Northern text, to identify the place of the lake’s image in the artistic worldview of the North.MATERIALS AND METHODS. Using a systematic approach to the literary text, which is a set of methods (chronotopic, motivic, mythopoetic, systemic-semantic) that reveal the object as a single system, the lake’s image in the works of writers of the second half of the 20th century is considered: A. Linevsky, A. Petukhov, V. Pikul, M. Skorokhodov, A. Chlenov.RESULTS AND DISCUSSION. After analyzing the artistic material, it is concluded that there are two variants of the lake ’s image: tundra and forest lakes. The first is realized through the mythologeme of the circle and the personification method, the second through the motives of the two worlds, secrets, boundaries, changes of the hero. The lake’s image in the Northern text of Russian literature for children also approaches the images of the sea and the river and actualizes the motif of the unity of the world.CONCLUSION. This study is a particular stage in the study of the figurative-semantic structure of the Northern text of Russian literature for children as a supertext and indicates broad prospects for its further study.

Role of Local Stakeholders in Preserving Urban Lake Ecosystem Services

The high vulnerability to environmental degradation in urban lakes requires serious management efforts. Involvement of various stakeholder components in urban lake management is urgently needed, including local stakeholders. This study aimed to see the influence of the role of local stakeholders (community and government) in preserving urban lake ecosystem services. Three lakes in Jakarta Indonesia with different surrounding landscape characteristics – Situ Babakan Lake (SBL), Srengseng Urban Forest Lake (SUFL), and South Sunter Lake (SSL) – were selected to see the local stakeholder's role in various ecosystem services such as fish provision, water quality regulation, local cultural preservation, and tree biodiversity support. Ecosystem services analysis was measured using various methods such as fish production potential, water quality index, total local cultural elements, and the Shannon-Wiener index. Meanwhile, observations of local community traditions and lifestyles, as well as interviews were used to measure stakeholder’s influence on ecosystem services. The analysis shows that SBL, a lake surrounded by a cultural preservation area, had the best ecosystem service conditions among other locations. Fish provisioning services in SBL had the highest production potential (2.99 tons/yr), followed by SSL (1.33 tons/yr) and SUFL (0.17 tons/yr). The highest value of water quality regulating was also found in SBL (53.6), followed by SUFL (48) and SSL (44.8). SBL also preserved the most cultural elements (10 from 12), followed by SUFL (7 from 12) and SSL (6 from 12). Tree biodiversity index had varied values in SBL (4.23), SUFL (2.81), and SSL (1.85). Cultural preserved area triggers local stakeholders to manage the area intensively because of the high importance in social, environmental, and economic value. However, government-dominated management shows the unpreparedness of research locations in adopting community-based tourism.

Ultrasound Percutaneous Tenotomy: An Intervention for Managing Lateral Epicondylitis: A Narrative Review

A growing emphasis is being focused on percutaneous ultrasonic tenotomy for expedited recovery from lateral epicondylitis (LE) and enhanced functionality. The TX1 tissue removal system, also known as the Tenex device from Tenex device (Tenex Health Inc., Lake Forest, CA, USA), notably excels in the management of chronic LE. Utilizing ultrasonic energy, this device offers three tips, namely, TX1, TX2, and TXBone-introducing novel avenues, for determining the previously inaccessible tendon pathology. The procedure disrupts degenerated segments, which creates fenestrations that induce local hemorrhage and the release of vasoactive substances. The overarching goal of Tenex is to boost vascularity through the initiation of tendon repair via the deposition of new collagen and elimination of necrotic tissues. This review assesses Tenex’s effectiveness though gathering information, aiming to understand how it helps doctors and other healthcare professionals in their work.

Interactive effects of climate-atmospheric cycling on aquatic communities and ecosystem shifts in mountain lakes of southeastern Tibetan Plateau

Recent climate warming and atmospheric reactive nitrogen (Nr) deposition are affecting a broad spectrum of physical, ecological and human systems that may be irreversible on a century time scale and have the potential to cause regime shifts in ecological systems. These changes may alter the limnological conditions with important but still unclear effects on lake ecosystems. We present changes in cladoceran with comparisons to diatom assemblages over the past ~200 years from high-resolution, well-dated sediment cores retrieved from six high mountain lakes in the southeastern (SE) margin of the Tibetan Plateau. Our findings suggest that warming and the exponential increase of atmospheric Nr deposition are the major drivers of ecological regime changes. Shifts in cladoceran and diatom communities in high alpine lakes began over a century ago and intensified since 1950 CE, indicating a regional-scale response to anthropogenic climate warming. Zooplankton in the forest lakes showed asynchronous trajectories, with increased Nr deposition as a significant explanatory factor. Forest lakes with higher dissolved organic carbon (DOC) concentrations partially buffered the impacts of Nr deposition with little structural change, while lakes with low DOC display symptoms of resilience loss related to Nr deposition. Biological community compositional turnover in subalpine lakes has shown marked shifts, equivalent to those of low-elevation lakes strongly affected by direct human impacts. This suggests that local effects override climatic forcing and that lake basin features modified by anthropogenic activity act as basin-specific filters of common forcing. Our results indicate that snow and glacial meltwaters along with nutrient enrichment related to climate warming and atmospheric Nr deposition, represent major threats for lake ecosystems, even in remote areas. We reveal that climate and atmospheric contaminants will further impact ecological conditions and alter aquatic food webs in higher altitude biomes if climate and anthropogenic forcing continue.

Tree dieback and subsequent changes in water quality accelerated the climate-related warming of a central European forest lake

Abstract The water temperature of many lakes has recently risen as a result of climate change. We evaluated trends in the cloudiness, solar radiation, wind, air and water temperatures, ice cover, thermocline depth, transparency, and composition of two Bohemian Forest lakes (Czech Republic) from 1998 to 2022. Lake water temperatures increased by 0.32–0.47 °C decade−1, and the ice cover periods decreased by 11.7–14.8 days decade−1. These changes were mostly associated with increasing air temperatures during most months and increasing solar radiation (due to decreasing cloudiness) especially in March and November (the months preceding ice-on/off). Decreasing snow cover in winter (by 3.8 cm decade−1) further accelerated the earlier ice melt. The number of days with water temperature ≥4 °C increased similarly in both lakes by 12–13 days decade−1. However, the number of days with water temperature ≥20 °C increased and the depth of the summer thermocline decreased more in the lake with tree dieback in its catchment. Tree dieback accelerated the leaching of organic carbon and phosphorus, increasing water brownification, algal production, and decreasing water transparency. Solar radiation was absorbed in shallower water layers. Changes in catchment forest thus contributed to the variability in the response of lake water temperatures to climate change.

Impacts of acid deposition and lake browning on long-term organic carbon storage in Canadian northern forest lakes

Impacts of acid deposition and lake browning on long-term organic carbon storage in Canadian northern forest lakes

Николай Заболоцкий и Мария Юдина: к истории творческого общения

The article discusses the history of the creative dialogue between the great pianist Maria Veniaminovna Yudina and the outstanding poet Nikolay Alekseevich Zabolotsky. The material was not only Yudina’s memories of her joint work with the poet on equirhythmic translations of the collection Schubert’s Songs conceived by the pianist, but also Yudina’s thoughts expressed in various sources about the specific features of Zabolotsky’s work, whose poetry Yudina “ardently” loved. Based on Yudina’s definition of the poet’s work as “liturgical”, the article attempts to decipher this characterization. Poem Forest Lake is used for analysis, Yudina having noted that the person who wrote this poem is already on the threshold of the knowledge of God. In connection with the specific features of Zabolotsky’s poetic thought, bordering on the theological understanding of the world and man and embodied in the figurative matter of the Forest Lake, the article interprets the Gospel revelation about man, revealed in the writings of St. Gregorius Dialogus. “Traces” of the creative collaboration between Yudina and Zabolotsky are found in the 1947 poem Beethoven, which is not only the result of the joint work of Yudina and Zabolotsky on equirhythmic translations, but also the verbal embodiment of Yudina’s interpretation of Beethoven’s music, which she often played during their meetings with Zabolotsky. The article shows the specific character of the creative method of typological exegesis (this term is introduced by L. Levshun for the study of ancient Russian literature), which is used by Zabolotsky in the poems Forest Lake and Beethoven. Its essence lies in the fact that for any phenomenon or event a prototype is found in the Holy Scriptures and, thus, the event is explained, interpreted within the framework of the biblical paradigm. Zabolotsky does not interpret anything, but directs the reader’s feeling to unravel what kind of sacrament occurs in his poetry. Nikolay Zabolotsky in the poem Beethoven embodied Maria Yudina’s idea about music being a “message of revealed truths”, about music, which is the realization of the universal, cosmic liturgy.

The Effects of Water Column Dissolved Oxygen Concentrations on Lake Methane Emissions—Results From a Whole‐Lake Oxygenation Experiment

AbstractLakes contribute 9%–19% of global methane (CH4) emissions to the atmosphere. Dissolved molecular oxygen (DO) in lakes can inhibit the production of CH4 and promote CH4 oxidation. DO is therefore often considered an important regulator of CH4 emissions from lakes. Presence or absence of DO in the water above the sediments can affect CH4 production and emissions by (a) influencing if methane production can be fueled by the most reactive organic matter in the top sediment layer or rely on deeper and less degradable organic matter, and (b) enabling CH4 accumulation in deep waters and potentially large emissions upon water column turnover. However, the relative importance of these two DO effects on CH4 fluxes is still unclear. We assessed CH4 fluxes from two connected lake basins in northern boreal Sweden where one was experimentally oxygenated. Results showed no clear difference in summer CH4 emissions attributable to water column DO concentrations. Large amounts of CH4 accumulated in the anoxic hypolimnion of the reference basin but little of this may have been emitted because of incomplete mixing, and effective methane oxidation of stored CH4 reaching oxic water layers. Accordingly, ≤24% of the stored CH4 was likely emitted in the experimental lake. Overall, our results suggest that hypolimnetic DO and water column CH4 storage might have a smaller impact on CH4 emissions in boreal forest lakes than previous estimates, yet potential fluxes associated with water column turnover events remain a significant uncertainty in lake CH4 emission estimates.

Assessment of Smear Layer Formation After Caries Removal Using Erbium Laser and Papain-Based Chemo-Mechanical Caries Removal Agent: An In Vitro Scanning Electron Microscopy Study.

Introduction With the advancement in the field of adhesive dentistry, there has been a significant and groundbreaking shift towardthe adoption of minimally invasive caries removal techniques where substrate modification is known to enhance adhesive bonding. The smear layer has always been controversial, as its modification helps in bonding, but if contaminated with bacteria, it compromises the formation of a satisfactory marginal seal. Thus, the recognition of the role played by the smear layer highlights the importance of the type of caries removal method employed. Hence, the aim of the present study was to assess and compare smear layer formation after caries removal using an erbium laser and chemo-mechanical caries removal agent by scanning electron microscopy. Methods The study involved the evaluation of 30 extracted human molars with occlusal caries. Based on the method of caries excavation, the samples were allocated into two separate groups: group 1 - caries removed using erbium laser (Waterlase, Biolase, Lake Forest, CA); group 2 - caries removed using papain-based chemo-mechanical caries removal agent (Carie Fix, Dengen Dental, Bahadurgarh, India). To assess the smear layer, the samples underwent examination using a scanning electron microscope at 1500x and 3000x magnification after removal of caries. Statistical analysis was done using SPSS version 22 software (IBM Corp., Armonk, NY). Mann-Whitney test was used to compare the mean smear layer (nonparametric) between both groups. Results Group 1 (Er:YAG laser) showed significantly greater removal of the smear layer than group 2 (papain-based chemo-mechanical caries removal agent) on the excavated caries surfaces(p < 0.001). In group 1, the dentinal tubules exhibited greater patency when compared to the partial patency observed in group 2. Conclusion Both techniques for caries removal were effective; however, the Er:YAG laser method was determined to be more efficient in comparison to the chemo-mechanical agent. These caries removal methods can be considered the future of minimally invasive dentistry.