LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 28

Search options

  1. Article ; Online: Evaluation of a novel triplex immunochromatographic test for rapid simultaneous detection of norovirus, rotavirus, and adenovirus on a single strip test.

    Ushijima, Hiroshi / Pham, Ngan Thi Kim / Hoque, Sheikh Ariful / Nomura, Akiko / Kumthip, Kattareeya / Shimizu-Onda, Yuko / Okitsu, Shoko / Kawata, Kimiko / Hanaoka, Nozomu / Müller, Werner Eg / Maneekarn, Niwat / Hayakawa, Satoshi / Khamrin, Pattara

    Journal of infection and public health

    2024  Volume 17, Issue 4, Page(s) 619–623

    Abstract: Background: Acute gastroenteritis is one of the major causes of morbidity and mortality in young children worldwide. Among these, rotavirus, norovirus, and adenovirus have been reported as the primary viral pathogens associated with the disease. Rapid ... ...

    Abstract Background: Acute gastroenteritis is one of the major causes of morbidity and mortality in young children worldwide. Among these, rotavirus, norovirus, and adenovirus have been reported as the primary viral pathogens associated with the disease. Rapid diagnosis of viral pathogens is crucial when diarrhea outbreaks occur to ensure the timely administration of appropriate treatment and control measures.
    Methods: We evaluated three immunochromatographic test kits designed for the detection of norovirus, rotavirus, and adenovirus in 71 stool specimens collected from children with diarrhea who visited clinics in Japan. The first kit is a triplex immunochromatographic test kit designed for simultaneous detections of norovirus, rotavirus, and adenovirus on a single strip (this kit was referred to as IC-A). The other two immunochromatographic test kits are a dual detection kit for rotavirus and adenovirus, and a single detection kit for norovirus (IC-B). The RT-PCR/PCR was used as the gold standard method.
    Results: The results revealed that both IC-A and IC-B kits exhibited the same level of sensitivity of detection for rotavirus (72.7%) and adenovirus (22.7%), although the detection rate was lower than that of the RT-PCR/PCR method. However, there was a slight difference in the sensitivity of detection for norovirus between IC-A and IC-B, at 86.7% and 93.3%, respectively. The sensitivity of detection for adenovirus of both kits was relatively lower than those of RT-PCR method. This could be due to low viral load of adenovirus in clinical specimens below the detection limit of IC-A and IC-B kits. However, both immunochromatographic test kits (IC-A and IC-B) exhibited 100% specificity for norovirus, rotavirus, and adenovirus.
    Conclusions: The triplex immunochromatographic test kit (IC-A) designed for simultaneous detection of norovirus, rotavirus, and adenovirus has been proved to be more practical and convenient than the use of single or dual detection kits with more or less the same sensitivity and specificity of detections.
    MeSH term(s) Child ; Humans ; Child, Preschool ; Rotavirus ; Adenoviridae ; Norovirus ; Feces ; Diarrhea/diagnosis ; Sensitivity and Specificity ; Caliciviridae Infections/diagnosis
    Language English
    Publishing date 2024-02-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2467587-8
    ISSN 1876-035X ; 1876-0341
    ISSN (online) 1876-035X
    ISSN 1876-0341
    DOI 10.1016/j.jiph.2024.02.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Evaluation of an Immunochromatographic Test for Rapid Detection of Astrovirus in Acute Gastroenteritis Pediatric Patients.

    Khamrin, Pattara / Pham, Ngan Thi Kim / Shimizu-Onda, Yuko / Trinh, Quang Duy / Hoque, Sheikh Ariful / Kumthip, Kattareeya / Nomura, Akiko / Okitsu, Shoko / Maneekarn, Niwat / Müller, Werner E G / Hayakawa, Satoshi / Ushijima, Hiroshi

    Clinical laboratory

    2023  Volume 69, Issue 8

    MeSH term(s) Child ; Humans ; Infant ; Gastroenteritis/diagnosis ; Rotavirus ; Immunologic Tests ; Feces
    Language English
    Publishing date 2023-08-10
    Publishing country Germany
    Document type Letter
    ZDB-ID 1307629-2
    ISSN 1433-6510 ; 0941-2131
    ISSN 1433-6510 ; 0941-2131
    DOI 10.7754/Clin.Lab.2023.230314
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Soluble Uric Acid Promotes Atherosclerosis via AMPK (AMP-Activated Protein Kinase)-Mediated Inflammation.

    Kimura, Yoshitaka / Yanagida, Tamiko / Onda, Akiko / Tsukui, Daisuke / Hosoyamada, Makoto / Kono, Hajime

    Arteriosclerosis, thrombosis, and vascular biology

    2020  Volume 40, Issue 3, Page(s) 570–582

    Abstract: Objective: Uric acid is supposed but not yet determined to be associated with atherosclerosis. Uric acid is released from damaged cells to form urate crystal, which is recognized by the immune system to produce IL (interleukin)-1. Danger signals and IL- ... ...

    Abstract Objective: Uric acid is supposed but not yet determined to be associated with atherosclerosis. Uric acid is released from damaged cells to form urate crystal, which is recognized by the immune system to produce IL (interleukin)-1. Danger signals and IL-1 have been shown to play an important role in atherosclerosis. We determined whether the physiological level of soluble uric acid promotes inflammation and develops atherosclerosis. Approach and Results: The secretion of IL-1β from human peripheral blood mononuclear cells mediated by NLRP3 (NACHT, LRR, and PYD domain-containing protein 3) inflammasome was promoted by physiological levels in serum uric acid. This augmentation of inflammation was mediated by the regulation of the AMPK (AMP-activated protein kinase)-mTOR (mammalian target of rapamycin) mitochondrial reactive oxygen species and HIF-1α (hypoxia-inducible factor-1α) pathway. In both of uricase transgenic and xanthine oxidase inhibitor-treated mice, decreased levels of uric acid resulted in the activation of AMPK and attenuation of the development of atherosclerotic plaques. Further, acute uric acid reduction by the administration of benzbromarone in healthy humans for 2 weeks significantly decreased plasma IL-18-an inflammasome-dependent cytokine.
    Conclusions: The data indicate that the development of atherosclerosis and inflammation is promoted by uric acid in vivo. Moreover, the lowering of uric acid levels attenuated inflammation via the activation of the AMPK pathway. This study provides mechanistic evidence of uric acid-lowering therapies for atherosclerosis.
    MeSH term(s) AMP-Activated Protein Kinases/metabolism ; Adult ; Animals ; Atherosclerosis/blood ; Atherosclerosis/enzymology ; Atherosclerosis/pathology ; Atherosclerosis/prevention & control ; Benzbromarone/administration & dosage ; Biomarkers/blood ; Disease Models, Animal ; Enzyme Inhibitors/pharmacology ; Female ; HEK293 Cells ; Humans ; Hypoxia-Inducible Factor 1, alpha Subunit/metabolism ; Inflammasomes/genetics ; Inflammasomes/metabolism ; Inflammation/blood ; Inflammation/enzymology ; Inflammation/pathology ; Inflammation/prevention & control ; Inflammation Mediators/blood ; Interleukin-18/blood ; Interleukin-1beta/blood ; Interleukin-1beta/genetics ; Leukocytes, Mononuclear/drug effects ; Leukocytes, Mononuclear/enzymology ; Male ; Mice, Inbred C57BL ; Mice, Knockout, ApoE ; Middle Aged ; NLR Family, Pyrin Domain-Containing 3 Protein/genetics ; NLR Family, Pyrin Domain-Containing 3 Protein/metabolism ; Nuclear Factor 45 Protein/blood ; Plaque, Atherosclerotic ; Reactive Oxygen Species/metabolism ; Receptors, LDL/deficiency ; Receptors, LDL/genetics ; Urate Oxidase/genetics ; Urate Oxidase/metabolism ; Uric Acid/blood ; Uricosuric Agents/administration & dosage ; Xanthine Oxidase/antagonists & inhibitors ; Xanthine Oxidase/metabolism ; Young Adult
    Chemical Substances Biomarkers ; Enzyme Inhibitors ; HIF1A protein, human ; Hypoxia-Inducible Factor 1, alpha Subunit ; IL1B protein, human ; ILF2 protein, human ; Inflammasomes ; Inflammation Mediators ; Interleukin-18 ; Interleukin-1beta ; NLR Family, Pyrin Domain-Containing 3 Protein ; NLRP3 protein, human ; Nuclear Factor 45 Protein ; Reactive Oxygen Species ; Receptors, LDL ; Uricosuric Agents ; Uric Acid (268B43MJ25) ; Benzbromarone (4POG0RL69O) ; Xanthine Oxidase (EC 1.17.3.2) ; Urate Oxidase (EC 1.7.3.3) ; AMP-Activated Protein Kinases (EC 2.7.11.31)
    Language English
    Publishing date 2020-01-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1221433-4
    ISSN 1524-4636 ; 1079-5642
    ISSN (online) 1524-4636
    ISSN 1079-5642
    DOI 10.1161/ATVBAHA.119.313224
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Chronological Changes in Mucosal Deformity by Endoscopic Suturing after Gastric Endoscopic Submucosal Dissection: A Multicenter Retrospective Analysis.

    Higuchi, Kazutoshi / Goto, Osamu / Takahashi, Akiko / Akimoto, Teppei / Habu, Tsugumi / Ishikawa, Yumiko / Kirita, Kumiko / Koizumi, Eriko / Noda, Hiroto / Onda, Takeshi / Omori, Jun / Akimoto, Naohiko / Kaise, Mitsuru / Yahagi, Naohisa / Oyama, Tsuneo / Iwakiri, Katsuhiko

    Digestion

    2022  Volume 104, Issue 2, Page(s) 121–128

    Abstract: Introduction: Endoscopic suturing of a mucosal defect is expected to prevent postoperative bleeding after endoscopic submucosal dissection (ESD). Endoscopic suturing causes mucosal deformity, which may interfere with endoscopic surveillance thereafter. ... ...

    Abstract Introduction: Endoscopic suturing of a mucosal defect is expected to prevent postoperative bleeding after endoscopic submucosal dissection (ESD). Endoscopic suturing causes mucosal deformity, which may interfere with endoscopic surveillance thereafter. We retrospectively investigated long-term chronological changes in mucosal suturing by endoscopic suturing.
    Methods: Forty-three patients who underwent endoscopic hand suturing (EHS) after gastric ESD at three institutions were enrolled. First, our hypothesis that the suturing sites healed via inflammation, disappearance of mucosal inversion, and flattening was validated. Subsequently, the duration required to reach each healing step was evaluated.
    Results: A total of 137 follow-up endoscopies were assessed, in which all cases showed the hypothesized chronological course on the suturing sites. The 95th percentiles of the duration when showing the disappearance of the inflammatory change and the inverted change were 63 days and 15.5 months after the procedure, respectively.
    Discussion/conclusion: The data show that the mucosal deformity induced by EHS disappeared within 16 months. Endoscopic suturing is thus considered to have a negligible effect on endoscopic surveillance following the procedure.
    MeSH term(s) Humans ; Endoscopic Mucosal Resection/adverse effects ; Endoscopic Mucosal Resection/methods ; Gastric Mucosa/diagnostic imaging ; Gastric Mucosa/surgery ; Retrospective Studies ; Stomach Neoplasms/surgery
    Language English
    Publishing date 2022-12-07
    Publishing country Switzerland
    Document type Multicenter Study ; Journal Article
    ZDB-ID 1712-7
    ISSN 1421-9867 ; 0012-2823
    ISSN (online) 1421-9867
    ISSN 0012-2823
    DOI 10.1159/000527350
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Stimulus frequency-dependent inhibition of micturition contractions of the urinary bladder by electrical stimulation of afferent Aβ, Aδ, and C fibers in cutaneous branches of the pudendal nerve.

    Onda, Akiko / Uchida, Sae / Suzuki, Harue / Hotta, Harumi

    The journal of physiological sciences : JPS

    2016  Volume 66, Issue 6, Page(s) 491–496

    Abstract: We aimed to examine the afferent mechanisms for the reflex inhibition of the rhythmic micturition contractions (RMCs) of the urinary bladder induced by stimulation of the perineal skin afferents in urethane-anesthetized rats. Electrical stimulation ( ... ...

    Abstract We aimed to examine the afferent mechanisms for the reflex inhibition of the rhythmic micturition contractions (RMCs) of the urinary bladder induced by stimulation of the perineal skin afferents in urethane-anesthetized rats. Electrical stimulation (pulse duration: 0.5 ms) was applied to the cutaneous branches of the pudendal nerve (CBPN) at frequencies of 0.1, 1, and 10 Hz for 1 min. Nerve fiber groups were defined by recording compound action potentials from CBPN. Activation of only Aβ fibers (0.2 V) produced an inhibition of RMCs at 7-11 min after the onset of stimulation (late inhibition), at any tested frequency. Additional activation of Aδ fibers (1 V) produced additional early inhibition (immediately after stimulation) at 1 and 10 Hz. Furthermore, additional activation of C fibers (10 V) at 10 Hz completely stopped RMCs for >10 min. This strong inhibition persisted after local application of capsaicin to the stimulating CBPN. We conclude that activities of Aβ, Aδ, and C afferent fibers, without capsaicin-sensitive channels, can contribute to the inhibition of bladder contractions.
    Language English
    Publishing date 2016-11
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2234472-X
    ISSN 1880-6562 ; 1880-6546
    ISSN (online) 1880-6562
    ISSN 1880-6546
    DOI 10.1007/s12576-016-0468-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: Modulation of Calcitonin, Parathyroid Hormone, and Thyroid Hormone Secretion by Electrical Stimulation of Sympathetic and Parasympathetic Nerves in Anesthetized Rats.

    Hotta, Harumi / Onda, Akiko / Suzuki, Harue / Milliken, Philip / Sridhar, Arun

    Frontiers in neuroscience

    2017  Volume 11, Page(s) 375

    Abstract: The thyroid and parathyroid glands are dually innervated by sympathetic (cervical sympathetic trunk [CST]) and parasympathetic (superior laryngeal nerve [SLN]) nerve fibers. We examined the effects of electrical stimulation of efferent or afferent nerve ... ...

    Abstract The thyroid and parathyroid glands are dually innervated by sympathetic (cervical sympathetic trunk [CST]) and parasympathetic (superior laryngeal nerve [SLN]) nerve fibers. We examined the effects of electrical stimulation of efferent or afferent nerve fibers innervating the thyroid and parathyroid glands on the secretion of immunoreactive calcitonin (iCT), parathyroid hormone (iPTH), 3,3',5-triiodothyronine (iT3), and thyroxine (iT4) from the thyroid and parathyroid glands. In anesthetized and artificially ventilated rats, thyroid venous blood was collected. The rate of hormone secretion from the glands was calculated from plasma hormone levels, measured by ELISA, and the flow rate of thyroid venous plasma. SLNs or CSTs were stimulated bilaterally with rectangular pulses with a 0.5-ms width. To define the role of unmyelinated nerve fibers (typically efferent), the cut peripheral segments were stimulated at various frequencies (up to 40 Hz) with a supramaximal intensity to excite all nerve fibers. The secretion of iCT, iT3, and iT4 increased during SLN stimulation and decreased during CST stimulation. iPTH secretion increased during CST stimulation, but was not affected by SLN stimulation. To examine the effects of selective stimulation of myelinated nerve fibers (typically afferent) in the SLN, intact SLNs were stimulated with a subthreshold intensity for unmyelinated nerve fibers. iCT, iT3, and iT4 secretion increased during stimulation of intact SLNs at 40 Hz. These results suggest that excitation of myelinated afferents induced by low intensity and high frequency stimulation of intact SLNs promotes secretion of CT and thyroid hormones from the thyroid gland, potentially via reflex activation of parasympathetic efferent nerve fibers in the SLN.
    Language English
    Publishing date 2017-06-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2411902-7
    ISSN 1662-453X ; 1662-4548
    ISSN (online) 1662-453X
    ISSN 1662-4548
    DOI 10.3389/fnins.2017.00375
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: A familial case of alveolar capillary dysplasia with misalignment of the pulmonary veins: the clinicopathological features and unusual glomeruloid endothelial proliferation.

    Kitano, Akiko / Nakaguro, Masato / Tomotaki, Seiichi / Hanaoka, Shintaro / Kawai, Masahiko / Saito, Akiko / Hayakawa, Masahiro / Takahashi, Yoshiyuki / Kawasaki, Hidenori / Yamada, Takahiro / Ikeda, Masahiko / Onda, Tetsuo / Cho, Kazutoshi / Haga, Hironori / Nakazawa, Atsuko / Minamiguchi, Sachiko

    Diagnostic pathology

    2020  Volume 15, Issue 1, Page(s) 48

    Abstract: Background: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACD/MPV) is a rare disorder of pulmonary vascular abnormality with persistent pulmonary hypertension of the newborn. The symptom usually presents within hours after birth, ... ...

    Abstract Background: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACD/MPV) is a rare disorder of pulmonary vascular abnormality with persistent pulmonary hypertension of the newborn. The symptom usually presents within hours after birth, leading to an early demise. Heterozygous de novo point mutations and genomic deletions of the FOXF1 (forkhead box F1) gene or its upstream enhancer have been identified in most patients with ACD/MPV. Most cases of ACD/MPV are sporadic; however, familial cases are also reported in 10% of patients.
    Case presentation: We herein report a case of familial ACD/MPV that showed unusual glomeruloid proliferation of endothelial cells. In this family, three of the four siblings died within two to 3 days after birth because of persistent pulmonary hypertension and respiratory failure. Only the second child remains alive and healthy. An autopsy was performed for the third and fourth children, resulting in a diagnosis of ACD/MPV based on the characteristic features, including misalignment of smaller pulmonary veins and lymphangiectasis. In both of these children, glomeruloid endothelial proliferation of vessels was noted in the interlobular septa. The vessels were immunohistochemically positive for D2-40, CD31, Factor VIII, and ERG, suggestive of differentiation for both lymphatic and blood vessels.
    Conclusions: Unusual glomeruloid endothelial proliferation was observed in a familial ACD/MPV case. This histologic feature has not been described previously in ACD/MPV or any other pulmonary disease. Although the histogenesis of this histologic feature is unclear, this finding may suggest that ACD/MPV is a compound vascular and lymphovascular system disorder that exhibits various histologic features.
    MeSH term(s) Endothelial Cells/pathology ; Female ; Forkhead Transcription Factors/genetics ; Humans ; Infant, Newborn ; Male ; Mutation ; Persistent Fetal Circulation Syndrome/genetics ; Persistent Fetal Circulation Syndrome/pathology
    Chemical Substances FOXF1 protein, human ; Forkhead Transcription Factors
    Language English
    Publishing date 2020-05-09
    Publishing country England
    Document type Case Reports ; Journal Article
    ISSN 1746-1596
    ISSN (online) 1746-1596
    DOI 10.1186/s13000-020-00972-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Molecular determinants of sterile inflammation.

    Kono, Hajime / Onda, Akiko / Yanagida, Tamiko

    Current opinion in immunology

    2014  Volume 26, Page(s) 147–156

    Abstract: Necrotic cell death alerts the acquired immune system to activate naïve T cells even in the absence of non-self derived molecules (e.g. pathogens). In addition, sterile necrosis leads to innate immune-mediated acute inflammation. The dying cells still ... ...

    Abstract Necrotic cell death alerts the acquired immune system to activate naïve T cells even in the absence of non-self derived molecules (e.g. pathogens). In addition, sterile necrosis leads to innate immune-mediated acute inflammation. The dying cells still represent a threat to the body that should be eliminated by the host immune response. Although the inflammatory response plays important roles in protecting the host and repairing tissues, it can also cause the collateral damage to normal tissues that underlies disease pathogenesis. Tissue resident macrophages recognize the danger signals released from necrotic cells via the pattern recognition receptors and secrete IL-1 that results in acute neutrophilic inflammation. This article will review our current knowledge especially focusing on the role of IL-1 in the sterile necrotic cell death induced inflammation.
    MeSH term(s) Acute Disease ; Adaptive Immunity ; Carrier Proteins/physiology ; Cell Death/immunology ; Humans ; Immunity, Innate ; Inflammation/immunology ; Inflammation/metabolism ; Inflammation/pathology ; Interleukin-1alpha/physiology ; Interleukin-1beta/physiology ; Models, Molecular ; NLR Family, Pyrin Domain-Containing 3 Protein ; Necrosis
    Chemical Substances Carrier Proteins ; Interleukin-1alpha ; Interleukin-1beta ; NLR Family, Pyrin Domain-Containing 3 Protein ; NLRP3 protein, human
    Language English
    Publishing date 2014-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1035767-1
    ISSN 1879-0372 ; 0952-7915
    ISSN (online) 1879-0372
    ISSN 0952-7915
    DOI 10.1016/j.coi.2013.12.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Incidence of alveolar capillary dysplasia with misalignment of pulmonary veins in infants with unexplained severe pulmonary hypertension: The roles of clinical, pathological, and genetic testing.

    Onda, Tetsuo / Akimoto, Takuma / Hayasaka, Itaru / Ikeda, Masahiko / Furuse, Yuta / Ando, Akiko / Nakamura, Yuichi / Honjo, Ryota / Manabe, Atsushi / Furuta, Itsuko / Cho, Kazutoshi

    Early human development

    2021  Volume 155, Page(s) 105323

    Abstract: Background: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV) is a rare and fatal disorder that occurs in the developing fetal lungs; at birth, infants exhibit an oxygenation disorder accompanied by severe pulmonary hypertension ...

    Abstract Background: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV) is a rare and fatal disorder that occurs in the developing fetal lungs; at birth, infants exhibit an oxygenation disorder accompanied by severe pulmonary hypertension (PH) and have a very short life span. ACDMPV is definitively diagnosed by pathological findings, and infants born with unexplained severe PH may not be properly diagnosed without a biopsy or autopsy.
    Methods: Japanese infants with unexplained severe PH were enrolled in this study. Genetic analyses were performed on DNA extracted from peripheral blood leukocytes. Sanger sequencing or next-generation sequencing was performed by coding exons and introns for FOXF1 in all samples. For individuals without pathogenic exonic variants, multiplex ligation-dependent probe amplification was performed to identify copy number variations (CNVs) in exons, introns, and in the upstream region of FOXF1.
    Results: This study included 30 infants who were diagnosed over the course of nine years. Four individuals had the pathogenic variations on the exon 1 of FOXF1, including two frameshift and two missense variations. Pathogenic CNVs were found in another five individuals.
    Conclusion: In the pathologically proven ACDMPV patients, the ratios of cases with exonic variations, CNVs, and no genetic findings were reported as 45%, 45% and 10%, respectively. We estimate that about 30% (10 (9 + 1) out of 30) of individuals with unexplained severe PH had ACDMPV.
    MeSH term(s) DNA Copy Number Variations ; Forkhead Transcription Factors/genetics ; Genetic Testing ; Humans ; Hypertension, Pulmonary/epidemiology ; Hypertension, Pulmonary/genetics ; Incidence ; Infant ; Infant, Newborn ; Persistent Fetal Circulation Syndrome/epidemiology ; Persistent Fetal Circulation Syndrome/genetics
    Chemical Substances FOXF1 protein, human ; Forkhead Transcription Factors
    Language English
    Publishing date 2021-01-26
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 752532-1
    ISSN 1872-6232 ; 0378-3782
    ISSN (online) 1872-6232
    ISSN 0378-3782
    DOI 10.1016/j.earlhumdev.2021.105323
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Effect of canopy openness and meteorological factors on spatial variability of throughfall isotopic composition in a Japanese cypress plantation

    Sun, Xinchao / Akiko Hirata / Hiroaki Kato / Takashi Gomi / Xueyan Liu / Yuichi Onda

    Hydrological processes. 2018 Apr. 15, v. 32, no. 8

    2018  

    Abstract: Spatial variability of throughfall (TF) isotopic composition, used as tracer input, influences isotope hydrological applications in forested watersheds. Notwithstanding, identification of the dominant canopy factors and processes that affect the patterns ...

    Abstract Spatial variability of throughfall (TF) isotopic composition, used as tracer input, influences isotope hydrological applications in forested watersheds. Notwithstanding, identification of the dominant canopy factors and processes that affect the patterns of TF isotopic variability remains ambiguous. Here, we examined the spatio‐temporal variability of TF isotopic composition in a Japanese cypress plantation, in which intensive strip thinning was performed and investigated whether canopy structure at a fine resolution of canopy effect analysis is related to TF isotopic composition and how this is affected by meteorological factors. Canopy openness, as an index of canopy structure, was calculated from hemispherical photographs at different zenith angles. TF samples were collected in a 10 × 10 m experimental plot in both pre‐thinning (from July to November 2010) and post‐thinning (from May 2012 to March 2013) periods. Our results show that thinning resulted in a smaller alteration of input δ18O of gross precipitation, whereas the changes in deuterium excess varied in both directions. Despite the temporal stability of spatial patterns in TF amount, the spatial variability of TF isotopic composition was not temporally stable in both pre‐ and post‐thinning periods. Additionally, after thinning, the isotopic composition of TF was best related to canopy openness calculated at the zenith angle of 7°, exhibiting three different relationships, that is, significantly negative, significantly positive, and nonsignificant. Changes in meteorological factors (wind speed, rainfall intensity, and temperature) were found to affect the relationships between TF δ18O and canopy openness. The observed shifts in the relationships reveal different dominant factors (partial evaporation and the selection), and canopy water flowpaths control such differences. This study provides useful insights into the spatial variability of TF isotopic composition and improves our understanding of the physical processes of interception through canopy passage.
    Keywords canopy ; deuterium ; evaporation ; forested watersheds ; oxygen ; photographs ; rain intensity ; stable isotopes ; temperature ; throughfall ; wind speed
    Language English
    Dates of publication 2018-0415
    Size p. 1038-1049.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 1479953-4
    ISSN 1099-1085 ; 0885-6087
    ISSN (online) 1099-1085
    ISSN 0885-6087
    DOI 10.1002/hyp.11475
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top