Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology最新文献_第2页

Energy dissipation via the glycerol phosphate shuttle: coupling glycolysis to mitochondrial thermogenesis in Drosophila melanogaster flight muscle. 通过磷酸甘油穿梭的能量耗散：黑腹果蝇飞行肌中糖酵解与线粒体产热的耦合。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-14 DOI: 10.1007/s00360-026-01653-4

Johannes Lerchner, Yan A Reis, Thalita Lucio, Marcus F Oliveira

引用次数: 0

The "fire of life cycles": age-specific metabolic scaling within and among species. “生命周期之火”：物种内部和物种之间的年龄特异性代谢尺度。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-14 DOI: 10.1007/s00360-026-01655-2

Douglas S Glazier

引用次数: 0

Mussels enhance digestive enzyme activity in preparation for stressful fluctuating environments. 贻贝提高消化酶活性，为压力波动的环境做准备。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2025-12-26 DOI: 10.1007/s00360-025-01637-w

Jordan A James Bond, Petra I Escobar, Newton Z Hood, Helen C Hong, Daniel R Rankins, Grace Chan, Jade V Betancourt, Karina Brocco French, Nichole D Procter, Beck A Wehrle, Kwasi M Connor

{"title":"Mussels enhance digestive enzyme activity in preparation for stressful fluctuating environments.","authors":"Jordan A James Bond, Petra I Escobar, Newton Z Hood, Helen C Hong, Daniel R Rankins, Grace Chan, Jade V Betancourt, Karina Brocco French, Nichole D Procter, Beck A Wehrle, Kwasi M Connor","doi":"10.1007/s00360-025-01637-w","DOIUrl":"10.1007/s00360-025-01637-w","url":null,"abstract":"Elevated heat and low phytoplankton abundance are physiologically and ecologically challenging marine organisms of the northeast Pacific, including the mussel Mytilus californianus. During low tide, mussels are exposed to warm air and undergo anaerobic metabolism. Tidal variation coincides with daily fluctuations in food availability requiring flexible response systems (e.g., changes in digestive enzyme activity) to maintain homeostasis. In this study we allowed mussels to acclimate in tidal mesocosms with or without aerial heat across high and low levels of food abundance, after which we measured amylase (carbohydrase) activity and gene expression. Remarkably, enzyme activity was unpredictably elevated during low tide in fasted or moderate heat-stress (+ 8 °C; 23 °C) conditions, thereby potentially mitigating energy losses posed by environmental stress. Heat stress combined with fasting (multistressor) presented a marked challenge for mussels as evidenced by lower amylase activity compared to other treatments. A subsequent acute aerial heat-shock (+ 17 °C; 32 °C) negatively impacted amylase activity across all acclimation groups. Gene expression of amylase was anticorrelated with activity suggestive that mussels' sense environmental fluctuations and respond by regulating digestive enzyme activity. Although mussels can employ these strategies to dampen short-term stress, the heatwaves predicted to persist in their ecosystems in the future may curtail their effectiveness.","PeriodicalId":56033,"journal":{"name":"Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology","volume":" ","pages":"1-16"},"PeriodicalIF":1.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12935838/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145835401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tissue-specific changes in antioxidant defence during ageing: the effect of chronic cold exposure. 衰老过程中抗氧化防御的组织特异性变化：慢性寒冷暴露的影响。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-01-08 DOI: 10.1007/s00360-025-01646-9

Strahinja Djuric, Tamara Zakic, Aleksandra Korac, Bato Korac, Aleksandra Jankovic

{"title":"Tissue-specific changes in antioxidant defence during ageing: the effect of chronic cold exposure.","authors":"Strahinja Djuric, Tamara Zakic, Aleksandra Korac, Bato Korac, Aleksandra Jankovic","doi":"10.1007/s00360-025-01646-9","DOIUrl":"10.1007/s00360-025-01646-9","url":null,"abstract":"Ageing is a multifactorial process characterised by the progressive dysregulation of redox homeostasis in different organs. Although various endogenous and exogenous factors influencing ageing have been identified, limited evidence exists regarding the effects of chronic cold exposure on aged rats. To address this, we investigated interscapular brown (iBAT) and retroperitoneal white (rWAT) adipose tissue, skeletal muscle, and liver in rats (3-, 6- and 24-month-old) at 22 ± 1 °C, alongside a cohort of 24-month-old rats kept at 4 ± 1 °C from 6 to 24 months of age. We measured antioxidant defence (AD) components: the activity of copper zinc (CuZnSOD) and manganese (MnSOD) superoxide dismutase, catalase, glutathione peroxidase (GSH-Px), glutathione reductase (GR), thioredoxin reductase (TR), glutathione S-transferase (GST), and total glutathione (GSH) content. With chronological ageing, enzyme activity decreased in rWAT (catalase, GSH-Px, GR, TR, GST) and iBAT (GSH-Px). Conversely, aged rats exposed to 4 ± 1 °C showed an upregulation of AD components in rWAT (catalase, GSH-Px, GR, TR, GST; GSH), iBAT (catalase, GSH-Px, TR; GSH), and muscle (GSH-Px, GR, TR, GST), compared to age-matched group. However, CuZnSOD and MnSOD activities remained unchanged across all experimental groups and tissues. In addition, none of the measured AD components in the liver changed significantly across groups. Collectively, these results reveal a distinct modulation of the AD profiles in different organs, both during chronological ageing and after long-term exposure to cold, underscoring an integrated systemic responsiveness. This is most evident in the preserved AD response to prolonged cold exposure in the key thermogenic tissue, iBAT, of aged rats.","PeriodicalId":56033,"journal":{"name":"Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology","volume":" ","pages":"27-41"},"PeriodicalIF":1.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145936466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surviving in the mountains: temperature and elevation have contrasting physiological effects and no effect on morphology of the hoverfly Eristalis tenax in the Himalayas. 在山区生存：温度和海拔对喜玛拉雅山食蚜蝇的生理影响不同，但对食蚜蝇的形态没有影响。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-02-09 DOI: 10.1007/s00360-025-01642-z

Gauri Gharpure, Jagath Vedamurthy, Sakshi Priya, Sunil Prabhakar, Geetha G Thimmegowda, Shannon B Olsson

引用次数: 0

Heart rates of Steller sea lions drop slowly and oscillate while diving. 虎头海狮的心率在潜水时缓慢下降并振荡。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-01-30 DOI: 10.1007/s00360-025-01645-w

Rhea L Storlund, David A S Rosen, Martin Haulena, William K Milsom, Robert E Shadwick, Andrew W Trites

{"title":"Heart rates of Steller sea lions drop slowly and oscillate while diving.","authors":"Rhea L Storlund, David A S Rosen, Martin Haulena, William K Milsom, Robert E Shadwick, Andrew W Trites","doi":"10.1007/s00360-025-01645-w","DOIUrl":"10.1007/s00360-025-01645-w","url":null,"abstract":"Lowering heart rate while diving helps marine mammals regulate blood pressure while redistributing blood flow and conserving oxygen during extended dives. However, the classic characterization of this dive response-as a pronounced and abrupt reduction in heart rate observed during forced dives in laboratory settings-contrasts with the higher minimum heart rates and oscillatory patterns observed in freely diving marine mammals in the wild. To assess this apparent discrepancy in cardiovascular control, we measured the heart rates of three Steller sea lions (Eumetopias jubatus) using subcutaneous cardiac monitors during trained stationary dives (3-4 m) in an aquarium pool. During 12 of the longest dives (76-161 s), heart rates decreased from an average of 95 to 34 bpm within the first 26 s of submergence. However, while mean HR at depth eventually averaged around 31 bpm, it also oscillated between 27 and 39 bpm every ~ 5-6 s (0.2 Hz) for much of the dive, before rising prior to surfacing. The observed relatively slow drops in heart rates were similar to those seen in other marine mammals, suggesting an optimal rate of decline that reflects the anticipated conditions of voluntary dives. We further hypothesize that the oscillating minimum heart rates of freely diving marine mammals reflect time delays in the baroreceptor reflex due to the prolongation of circulation time. Our findings suggest these delays shape the rate and pattern of heart rate decline, ultimately influencing cardiovascular control, gas management, and breath-hold duration in diving mammals.","PeriodicalId":56033,"journal":{"name":"Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology","volume":" ","pages":"91-103"},"PeriodicalIF":1.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146088185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ionoregulatory and hematological parameters of Triportheus albus populations living in natural white- and blackwaters of the Amazon. 生活在亚马逊河自然白水和黑水中的白鹭种群的离子调节和血液学参数。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-01-29 DOI: 10.1007/s00360-025-01651-y

Rafael Mendonça Duarte, Susana Braz-Mota, Maria de Nazaré Paula Silva, Guacira de Figueiredo Eufrasio Pauly, João Henrique Alliprandini Costa, Jhonathan da Mota Silva, Adalberto L Val

引用次数: 0

Blood analytes relevant to nutritional status and energy metabolism in three sea turtle species across nesting season. 血液分析与三种海龟在产卵季节的营养状况和能量代谢有关。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-01-13 DOI: 10.1007/s00360-025-01643-y

Kristina L Kaleel, Justin R Perrault, Sarah E Hirsch, Brianna L Myre, Derek M Aoki, William R Bishop, Skyler Klingshirn, Hannah Niland, Selena Persaud, Madison Toonder, Nicole I Stacy

引用次数: 0

Daily torpor in summer- and winter-acclimated hamsters: are thermal biology and balancing energy budgets under a different seasonal physiological control? 夏天和冬季适应仓鼠的日常冬眠：热生物学和平衡能量预算是否在不同的季节生理控制下？

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-02-14 DOI: 10.1007/s00360-026-01654-3

Fritz Geiser, Claudia Bieber, Thomas Ruf

引用次数: 0

Short-term acclimation at elevated temperatures alters hematobiochemical parameters, erythrocyte and muscle structure, and critical thermal tolerance (CTmax) limit of Nile tilapia, Oreochromis niloticus. 尼罗罗非鱼（Oreochromis niloticus）短期高温驯化改变了其血液生化参数、红细胞和肌肉结构以及临界耐热性（CTmax）。

IF 1.6 3区生物学

Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2026-02-01 Epub Date: 2026-02-06 DOI: 10.1007/s00360-025-01650-z

S M Majharul Islam, Md Shahjahan, Umme Khadiza Noon, Ioannis N Vatsos

引用次数: 0