scholarly journals Simulated global warming increases usnic acid but reduces perlatolic acid in the mat-forming terricolous lichen Cladonia stellaris

2017 ◽  
Vol 49 (3) ◽  
pp. 269-274 ◽  
Author(s):  
Johan ASPLUND ◽  
Andy SIEGENTHALER ◽  
Yngvar GAUSLAA
Keyword(s):  
Global Warming ◽  
Extreme Environments ◽  
Usnic Acid ◽  
Secondary Compounds ◽  
Growing Season ◽  
Ambient Conditions ◽  
Symbiotic Associations ◽  
Slow Growing ◽  
Terricolous Lichen

AbstractLichens as sessile and slow-growing symbiotic associations have evolved various carbon-based secondary compounds (CBSCs) to mitigate the effects of some stressors in the extreme environments in which they often grow. The mat-forming lichen Cladonia stellaris, an important fodder for reindeer, produces usnic acid in the outermost layer and perlatolic acid in the medulla. Here, we studied effects of simulated global warming on these CBSCs in C. stellaris cultivated in climate chambers with: 1) ambient conditions as control or 2) ambient conditions +4°C. The chambers simulated, at an hourly resolution, an averaged 10-year growing season dynamic from a long-term monitored boreal mire in northern Sweden. After two months of acclimation, +4°C warming in one simulated growing season increased the concentration of usnic acid by 31% compared with ambient conditions, whereas the warming decreased the concentration of perlatolic acid by 14%. Since lichen CBSCs play important roles in ecosystem processes such as lichenivory and decomposition, these changes may profoundly affect lichen-dominated ecosystems.

The gastropod Arion fuscus prefers cyanobacterial to green algal parts of the tripartite lichen Nephroma arcticum due to low chemical defence

2009 ◽  
Vol 42 (1) ◽  
pp. 113-117 ◽  
Author(s):  
Johan ASPLUND ◽  
Yngvar GAUSLAA
Keyword(s):  
Usnic Acid ◽  
Chemical Defence ◽  
Secondary Compounds ◽  
Distribution Limit ◽  
Green Algal ◽  
Defensive Role ◽  
N Starvation ◽  
And Control ◽  
Terricolous Lichen ◽  
Acetone Rinsing

AbstractAlthough the tripartite terricolous lichen Nephroma arcticum is easily accessible to lichen-feeding gastropods, grazing marks are mainly restricted to localized cephalodia with N-fixing Nostoc. We tested if this gastropod preference for cephalodia can be explained by differences in carbon based secondary compounds (CBSCs) in cyanobacterial versus green-algal tissues. CBSCs were non-destructively removed from air-dry thalli by 100% acetone. Compound deficient and control thallus parts were offered to the slug Arion fuscus and grazing preferences were quantified by area measurements in ArcGIS™. The concentrations of CBSCs (phenarctin, usnic acid, nephroarctin and methyl gyrophorate) in thallus parts with and without cephalodia were quantified with HPLC. Compared to purely green-algal parts, cephalodial parts with adjoining fungal tissues contained less defensive compounds, and were preferred by A. fuscus. The cephalodia themselves do not contain any CBSCs. After acetone rinsing, A. fuscus did not discriminate between green-algal and cyanobacterial parts. The results were consistent with the hypothesis that CBSCs in green-algal parts of N. arcticum play a herbivore-defensive role. It is further hypothesized that grazing of cephalodia may lead to N-starvation and reduced growth of N. arcticum thalli in southern portions of its range where lichenivorous gastropods are more abundant. This may play a role in shaping the southern distribution limit of this arctic-boreal lichen species.

Response and adaptation of soybean systems to climate warming in Northeast China: insights gained from long-term field trials

2011 ◽  
Vol 62 (10) ◽  
pp. 876 ◽  
Author(s):  
H. F. Zheng ◽  
L. D. Chen ◽  
X. Z. Han
Keyword(s):  
Global Warming ◽  
Climate Warming ◽  
Crop Yields ◽  
Cropping Systems ◽  
Soybean Seed ◽  
Growing Season ◽  
Yield Reduction ◽  
Seed Filling ◽  
Term Field

Developing and assessing successful strategies to alleviate adverse impact of climate warming presents a new opportunity for sustainable agriculture and adaptation investment. Efforts to anticipate adaptation of cropping systems may benefit from understanding the global warming effects within decades. This study quantitatively examines the temperature warming impacts during, respectively, growing season and seed filling on soybean yields by using data from long-term field fertilisation experiments from 1987 to 2004. Here we report that grain yields significantly decreased with rising temperature during growing season, whereas the effects of increasing temperature at seed-filling stage on crop yields were significantly positive. The results indicate that a further temperature increment during seed filling appears to decrease soybean system’s risk of yield reduction. Importantly, we inferred that earlier occurrence of seed filling would increase the temperature of this period. The implication is that advancing the onset of soybean seed filling could be an effective adaptation option to global warming, providing an average yield benefit of ~14% per 10 days before the present date.

scholarly journals A warmer growing season triggers earlier following spring phenology

2021 ◽  
Author(s):  
hongshuang gu ◽  
yuxin qiao ◽  
zhenxiang xi ◽  
Sergio Rossi ◽  
Nicholas G. Smith ◽  
...  
Keyword(s):  
Global Warming ◽  
Large Scale ◽  
Carbon Assimilation ◽  
Growing Season ◽  
Vital Role ◽  
Spring Phenology ◽  
Previous Season ◽  
Photosynthetic Carbon ◽  
Photosynthetic Carbon Assimilation

Under global warming, advances in spring phenology due to the rising temperature have been widely reported. However, the mechanisms underlying the warming-induced earlier spring phenology remain poorly understood. Here, using multiple long-term and large-scale phenological datasets between 1951 and 2018, we show that warmer temperatures during the previous growing season between May and September led to earlier spring phenology in the Northern Hemisphere. We also found that warming-induced increases in maximum photosynthetic rate in the previous year advanced spring phenology. Furthermore, we found a significant decline in the advancing effect of warming during previous growing season on spring phenology from cold to warm periods over the past decades. Our results suggest that observed warming-induced earlier spring phenology may be driven by increased photosynthetic carbon assimilation in the previous season, while the slowdown in the advanced spring phenology is likely due to decreased carbon assimilation when warming exceeding the optimal temperatures for photosynthesis. Our study suggested the vital role of photosynthetic carbon assimilation during growing season in spring phenology under global warming.

Long-Term Increase in Hibernating Bats in Swedish Mines — Effect of Global Warming?

2019 ◽  
Vol 20 (2) ◽  
pp. 421 ◽  
Author(s):  
Jens Rydell ◽  
Johan Eklöf ◽  
Hans Fransson ◽  
Sabine Lind
Keyword(s):  
Global Warming

scholarly journals Influence of the Environment on the Reliability of Security Magnetic Contacts

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 401
Author(s):  
Martin Boros ◽  
Andrej Velas ◽  
Viktor Soltes ◽  
Jacek Dworzecki
Keyword(s):  
Global Warming ◽  
Extreme Conditions ◽  
Alarm System ◽  
Test Device ◽  
Reaction Distance ◽  
Ambient Temperatures ◽  
Thermal Chamber

Magnetic contacts are one of the basic components of an alarm system, providing access to buildings, especially windows and doors. From long-term reliability tests, it can be concluded that magnetic contacts show sufficient reliability. Due to global warming, we can measure high as well as low ambient temperatures in the vicinity of magnetic contacts, which can directly affect their reliability. As part of partial tests, research into the reliability of magnetic contacts, we created a test device with which their reaction distance was examined under extreme conditions simulated in a thermal chamber. The results of the practical tests have yielded surprising results.

scholarly journals Hidradenoma papilliferum of the hymen: a case report

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Ozer Birge ◽  
Mehmet Sait Bakır ◽  
Ceyda Karadag ◽  
Zivar Eldarova ◽  
Tayup Simsek
Keyword(s):  
Benign Neoplasm ◽  
Surgical Removal ◽  
Apocrine Glands ◽  
Sexually Transmitted ◽  
Anogenital Region ◽  
Hidradenoma Papilliferum ◽  
Anogenital Area ◽  
Slow Growing

Abstract Background Hidradenoma papilliferum is a rare benign neoplasm arising from apocrine glands. It occurs commonly on the anogenital region of middle-aged women. It usually presents as a slow growing, solitary asymptomatic, skin colored or red nodule less than 1 cm in diameter. Case presentation The case is a 38-year-old, white woman who presented with a painful nodule occurring within a month in the himenal region of the posterior vaginal introitus. The nodule was excisied and the histology revealed a hidradenoma papilliferum. The diagnosis and treatment of hidradenoma papilliferum is possible with surgical removal and histopathological evaluation of nodules. Conclusion When an adult woman presents with a noduler lesion in the anogenital area, sexually transmitted diseases and other benign and malignant vulvar lesions, as well as malignant transformation is very rare but,should be kept in mind; however because it has been reported and long-term clinical follow-up is suggested

scholarly journals Vegetation and microbes interact to preserve carbon in many wooded peatlands

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Hongjun Wang ◽  
Jianqing Tian ◽  
Huai Chen ◽  
Mengchi Ho ◽  
Rytas Vilgalys ◽  
...  
Keyword(s):  
Microbial Composition ◽  
Ecological Traits ◽  
Low Latitude ◽  
Carbon Decomposition ◽  
Positive Effects ◽  
Recalcitrant Carbon ◽  
Effects Of Temperature ◽  
Abiotic Controls ◽  
Slow Growing

AbstractPeatlands have persisted as massive carbon sinks over millennia, even during past periods of climate change. The commonly accepted theory of abiotic controls (mainly anoxia and low temperature) over carbon decomposition cannot fully explain how vast low-latitude shrub/tree dominated (wooded) peatlands consistently accrete peat under warm and seasonally unsaturated conditions. Here we show, by comparing the composition and ecological traits of microbes between Sphagnum- and shrub-dominated peatlands, that slow-growing microbes decisively dominate the studied shrub-dominated peatlands, concomitant with plant-induced increases in highly recalcitrant carbon and phenolics. The slow-growing microbes metabolize organic matter thirty times slower than the fast-growing microbes that dominate our Sphagnum-dominated site. We suggest that the high-phenolic shrub/tree induced shifts in microbial composition may compensate for positive effects of temperature and/or drought on metabolism over time in peatlands. This biotic self-sustaining process that modulates abiotic controls on carbon cycling may improve projections of long-term, climate-carbon feedbacks in peatlands.

scholarly journals Myopericytoma in the Antitragus of the Auricle: A Rare Tumor

2020 ◽  
pp. 014556132098457
Author(s):  
Tae Seong Eo ◽  
Jeong Hae Kie ◽  
Hyun Seung Choi ◽  
Junhui Jeong
Keyword(s):  
Large Firm ◽  
Rare Tumor ◽  
Long Term Follow Up ◽  
Slow Growing ◽  
Rule Out

A myopericytoma in the auricle is rare. If an auricle contains a large, firm, red-brown mass, excision should be considered because the mass may be a myopericytoma. After excision, histopathological and immunohistochemical diagnoses are essential to rule out malignancy. Long-term follow-up is required because the tumor is slow-growing.

scholarly journals Long-term stability in γ-CsPbI3 perovskite via an ultraviolet-curable polymer network

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Nam-Kwang Cho ◽  
Hyun-Jae Na ◽  
Jeeyoung Yoo ◽  
Youn Sang Kim
Keyword(s):  
Polymer Network ◽  
Lone Pair ◽  
Ambient Conditions ◽  
Absorption Properties ◽  
Term Stability ◽  
Long Term Stability ◽  
Ultraviolet Curable ◽  
Oxygen Lone Pair ◽  
Lone Pair Electrons

AbstractBlack-colored (α, γ-phase) CsPbI3 perovskites have a small bandgap and excellent absorption properties in the visible light regime, making them attractive for solar cells. However, their long-term stability in ambient conditions is limited. Here, we demonstrate a strategy to improve structural and electrical long-term stability in γ-CsPbI3 by the use of an ultraviolet-curable polyethylene glycol dimethacrylate (PEGDMA) polymer network. Oxygen lone pair electrons from the PEGDMA are found to capture Cs+ and Pb2+ cations, improving crystal growth of γ-CsPbI3 around PEGDMA. In addition, the PEGDMA polymer network strongly contributes to maintaining the black phase of γ-CsPbI3 for more than 35 days in air, and an optimized perovskite film retained ~90% of its initial electrical properties under red, green, and blue light irradiation.

Sign in / Sign up

Export Citation Format

Share Document