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  1. Article: Editorial: Genomics in plant sciences: understanding and development of stress-tolerant plants.

    Dar, Ayaz Mahmood / Touseef, Hussain / Nawaz, Kashif / Khan, Yusuf / Sahu, Pranav Pankaj

    Frontiers in plant science

    2023  Volume 14, Page(s) 1222818

    Language English
    Publishing date 2023-06-07
    Publishing country Switzerland
    Document type Editorial
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2023.1222818
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  2. Article ; Online: m6A RNA methylation counteracts dark-induced leaf senescence in Arabidopsis.

    Sheikh, Arsheed H / Tabassum, Naheed / Rawat, Anamika / Almeida Trapp, Marilia / Nawaz, Kashif / Hirt, Heribert

    Plant physiology

    2023  Volume 194, Issue 4, Page(s) 2663–2678

    Abstract: Senescence is an important physiological process which directly affects many agronomic traits in plants. Senescence induces chlorophyll degradation, phytohormone changes, cellular structure damage, and altered gene regulation. Although these ... ...

    Abstract Senescence is an important physiological process which directly affects many agronomic traits in plants. Senescence induces chlorophyll degradation, phytohormone changes, cellular structure damage, and altered gene regulation. Although these physiological outputs are well defined, the molecular mechanisms employed are not known. Using dark-induced leaf senescence (DILS) as the experimental system, we investigated the role of N6-methyladenosine (m6A) mRNA methylation during senescence in Arabidopsis (Arabidopsis thaliana). Plants compromised in m6A machinery components like METHYLTRANSFERASE A (mta mutant) and VIRILIZER1 (vir-1 mutant) showed an enhanced DILS phenotype. This was accompanied by compromised chloroplast and photosynthesis performance in mta as well as accumulation of senescence-promoting camalexin and phytohormone jasmonic acid after dark treatment. m6A levels increased during DILS and destabilized senescence-related transcripts thereby preventing premature aging. Due to inefficient decay, senescence-related transcripts like ORESARA1 (ORE1), SENESCENCE-ASSOCIATED GENE 21 (SAG21), NAC-like, activated by AP3/PI (NAP), and NONYELLOWING 1 (NYE1) over-accumulated in mta thereby causing accelerated senescence during DILS. Overall, our data propose that m6A modification is involved in regulating the biological response to senescence in plants, providing targets for engineering stress tolerance of crops.
    MeSH term(s) Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Plant Growth Regulators/metabolism ; Transcription Factors/metabolism ; Plant Senescence ; RNA Methylation ; Plant Leaves/metabolism ; Gene Expression Regulation, Plant
    Chemical Substances Arabidopsis Proteins ; Plant Growth Regulators ; Transcription Factors
    Language English
    Publishing date 2023-12-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208914-2
    ISSN 1532-2548 ; 0032-0889
    ISSN (online) 1532-2548
    ISSN 0032-0889
    DOI 10.1093/plphys/kiad660
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 1193: Show issues

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  3. Article ; Online: Experimental performance of ejector heat pump operating in the sub-critical mode

    Spitzenberger, Jeremy / Mohammed, Ramy H. / Ismael, Laith / Wang, Pengtao / Ma, Hongbin / Abu-Heiba, Ahmad / Kowalski, Stephen / Nawaz, Kashif

    Energy Conversion and Management. 2023 Feb., v. 278 p.116724-

    2023  

    Abstract: Ejector heat pump (EHP) is an efficient-energy technology with a promising potential to replace the vapor compression cycle in heating and cooling applications. It can be powered by low-grade waste heat and uses environmentally friendly working fluids. ... ...

    Abstract Ejector heat pump (EHP) is an efficient-energy technology with a promising potential to replace the vapor compression cycle in heating and cooling applications. It can be powered by low-grade waste heat and uses environmentally friendly working fluids. EHP has also become a viable solution in research seeking cooling applications. However, little attention has been paid to using EHP for heating purposes. In order to investigate this, a steam EHP for domestic water heating was designed and built. The coefficient of performance (COP) is evaluated at various operating and design conditions in sub-critical operational modes to achieve higher condensation temperatures. Two primary nozzles with a throat diameter of 1.5 mm and 2.0 mm were investigated. The primary nozzle is movable along the ejector’s axis, allowing investigation of its positional effects on the EHP’s COP. Experimental measurements revealed that using a smaller throat diameter results in a high COP and low back pressure. The EHP COP and back pressure increase when the LTE temperature increases. Using a throat diameter of 1.5 mm, the EHP COP increases as the nozzle exit position (NXP) becomes closer to the constant area section. A COP of 2.42 and a back pressure of 4.28 kPa are achieved at a high-temperature evaporator (HTE) temperature of 130 °C and a low-temperature evaporator (LTE) temperature of 30 °C using a primary nozzle with 1.5 mm.
    Keywords administrative management ; energy conversion ; heat ; heat pumps ; steam ; temperature ; throat ; Steam ejector ; Heat pump ; COP ; Sub-critical conditions ; Water heating
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2023.116724
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  4. Article: Ethylene involvement in the regulation of heat stress tolerance in plants

    Poór, Peter / Nawaz, Kashif / Gupta, Ravi / Ashfaque, Farha / Khan, M. Iqbal R.

    Plant cell reports. 2022 Mar., v. 41, no. 3

    2022  

    Abstract: Because of the rise in global temperature, heat stress has become a major concern for crop production. Heat stress deteriorates plant productivity and alters phenological and physiological responses that aid in precise monitoring and sensing of mild-to- ... ...

    Abstract Because of the rise in global temperature, heat stress has become a major concern for crop production. Heat stress deteriorates plant productivity and alters phenological and physiological responses that aid in precise monitoring and sensing of mild-to-severe transient heat stress. Plants have evolved several sophisticated mechanisms including hormone-signaling pathways to sense heat stimuli and acquire heat stress tolerance. In response to heat stress, ethylene, a gaseous hormone, is produced which is indispensable for plant growth and development and tolerance to various abiotic stresses including heat stress. The manipulation of ethylene in developing heat stress tolerance targeting ethylene biosynthesis and signaling pathways has brought promising out comes. Conversely increased ethylene biosynthesis and signaling seem to exhibit inhibitory effects in plant growth responses from primitive to maturity stages. This review mainly focuses on the recent studies of ethylene involvement in plant responses to heat stress and its functional regulation, and molecular mechanism underlying the plant responses in the mitigation of heat-induced damages. Furthermore, this review also describes the crosstalk between ethylene and other signaling molecules under heat stress and approaches to improve heat stress tolerance in plants.
    Keywords crop production ; ethylene ; ethylene production ; heat ; heat stress ; phenology ; plant growth ; stress tolerance ; temperature
    Language English
    Dates of publication 2022-03
    Size p. 675-698.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    Note Review
    ZDB-ID 8397-5
    ISSN 1432-203X ; 0721-085X ; 0721-7714
    ISSN (online) 1432-203X
    ISSN 0721-085X ; 0721-7714
    DOI 10.1007/s00299-021-02675-8
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    In stock of ZB MED Bonn / Germany

    Z 85/705: Show issues

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  5. Article ; Online: Moisture affinity of HDPE/phase-change material composites for thermal energy storage applications.

    Nawaz, Kashif / Freeman, Thomas B / Rodriguez, Rafael M / Boetcher, Sandra K S

    RSC advances

    2021  Volume 11, Issue 49, Page(s) 30569–30573

    Abstract: Moisture adsoprtion can degrade the structural integrity of thermal energy storage devices and can negatively impact the capacity and charging/discharging behaviour. Steady-state and transient experiments are conducted at various operating temperatures ... ...

    Abstract Moisture adsoprtion can degrade the structural integrity of thermal energy storage devices and can negatively impact the capacity and charging/discharging behaviour. Steady-state and transient experiments are conducted at various operating temperatures to evaluate the moisture affinity of organic phase-change material (PCM) shape stabilized with high-density polyethylene (HDPE).
    Language English
    Publishing date 2021-11-08
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d1ra03618a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Histone modifications and DNA methylation act cooperatively in regulating symbiosis genes in the sea anemone Aiptasia.

    Nawaz, Kashif / Cziesielski, Maha J / Mariappan, Kiruthiga G / Cui, Guoxin / Aranda, Manuel

    BMC biology

    2022  Volume 20, Issue 1, Page(s) 265

    Abstract: Background: The symbiotic relationship between cnidarians and dinoflagellates is one of the most widespread endosymbiosis in our oceans and provides the ecological basis of coral reef ecosystems. Although many studies have been undertaken to unravel the ...

    Abstract Background: The symbiotic relationship between cnidarians and dinoflagellates is one of the most widespread endosymbiosis in our oceans and provides the ecological basis of coral reef ecosystems. Although many studies have been undertaken to unravel the molecular mechanisms underlying these symbioses, we still know little about the epigenetic mechanisms that control the transcriptional responses to symbiosis.
    Results: Here, we used the model organism Exaiptasia diaphana to study the genome-wide patterns and putative functions of the histone modifications H3K27ac, H3K4me3, H3K9ac, H3K36me3, and H3K27me3 in symbiosis. While we find that their functions are generally conserved, we observed that colocalization of more than one modification and or DNA methylation correlated with significantly higher gene expression, suggesting a cooperative action of histone modifications and DNA methylation in promoting gene expression. Analysis of symbiosis genes revealed that activating histone modifications predominantly associated with symbiosis-induced genes involved in glucose metabolism, nitrogen transport, amino acid biosynthesis, and organism growth while symbiosis-suppressed genes were involved in catabolic processes.
    Conclusions: Our results provide new insights into the mechanisms of prominent histone modifications and their interaction with DNA methylation in regulating symbiosis in cnidarians.
    MeSH term(s) Animals ; Sea Anemones/genetics ; Histone Code ; Symbiosis ; DNA Methylation ; Ecosystem
    Language English
    Publishing date 2022-12-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2133020-7
    ISSN 1741-7007 ; 1741-7007
    ISSN (online) 1741-7007
    ISSN 1741-7007
    DOI 10.1186/s12915-022-01469-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Moisture affinity of HDPE/phase-change material composites for thermal energy storage applications

    Nawaz, Kashif / Freeman, Thomas B. / Rodriguez, Rafael M. / Boetcher, Sandra K. S.

    RSC advances. 2021 Nov. 08, v. 11, no. 49

    2021  

    Abstract: Moisture adsoprtion can degrade the structural integrity of thermal energy storage devices and can negatively impact the capacity and charging/discharging behaviour. Steady-state and transient experiments are conducted at various operating temperatures ... ...

    Abstract Moisture adsoprtion can degrade the structural integrity of thermal energy storage devices and can negatively impact the capacity and charging/discharging behaviour. Steady-state and transient experiments are conducted at various operating temperatures to evaluate the moisture affinity of organic phase-change material (PCM) shape stabilized with high-density polyethylene (HDPE).
    Keywords composite materials ; polyethylene ; temperature ; thermal energy
    Language English
    Dates of publication 2021-1108
    Size p. 30569-30573.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d1ra03618a
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  8. Article: Evolutionary and functional analysis of two‐component system in chickpea reveals CaRR13, a TypeB RR, as positive regulator of symbiosis

    Tiwari, Manish / Yadav, Manisha / Singh, Baljinder / Pandey, Vimal / Nawaz, Kashif / Bhatia, Sabhyata

    Plant biotechnology journal. 2021 Dec., v. 19, no. 12

    2021  

    Abstract: The critical role of cytokinin in early nodulation in legumes is well known. In our study, exogenous cytokinin application to roots of the important crop legume, chickpea (Cicer arietinum L.), led to the formation of pseudo‐nodules even in the absence of ...

    Abstract The critical role of cytokinin in early nodulation in legumes is well known. In our study, exogenous cytokinin application to roots of the important crop legume, chickpea (Cicer arietinum L.), led to the formation of pseudo‐nodules even in the absence of rhizobia. Hence, a genome‐wide analysis of the cytokinin signalling, two‐component system (TCS) genes, was conducted in chickpea, Medicago and Cajanus cajan. The integrated phylogenetic, evolutionary and expression analysis of the TCS genes was carried out, which revealed that histidine kinases (HKs) were highly conserved, whereas there was diversification leading to neofunctionalization at the level of response regulators (RRs) especially the TypeB RRs. Further, the functional role of the CaHKs in nodulation was established by complementation of the sln1Δ mutant of yeast and cre1 mutants of (Medicago) which led to restoration of the nodule‐deficient phenotype. Additionally, the highest expressing TypeB RR of chickpea, CaRR13, was functionally characterized. Its localization in the nucleus and its Y1H assay‐based interaction with the promoter of the early nodulation gene CaNSP2 indicated its role as a transcription factor regulating early nodulation. Overexpression, RNAi lines and complementation of cre1 mutants with CaRR13 revealed its critical involvement as an important signalling molecule regulating early events of nodule organogenesis in chickpea.
    Keywords Cajanus cajan ; Cicer arietinum ; Medicago ; biotechnology ; chickpeas ; cytokinins ; genes ; genome-wide association study ; histidine kinase ; mutants ; nodulation ; organogenesis ; phenotype ; phylogeny ; symbiosis ; transcription factors ; yeasts
    Language English
    Dates of publication 2021-12
    Size p. 2415-2427.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2136367-5
    ISSN 1467-7652 ; 1467-7644
    ISSN (online) 1467-7652
    ISSN 1467-7644
    DOI 10.1111/pbi.13649
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  9. Article: Thermal performance of an absorption-assisted two-stage ejector air-to-water heat pump

    Wang, Pengtao / Ma, Hongbin / Spitzenberger, Jeremy / Abu-Heiba, Ahmad / Nawaz, Kashif

    Energy conversion and management. 2021 Feb. 15, v. 230

    2021  

    Abstract: A gas-fired air-to-water ejector heat pump (EHP) for domestic hot water production is proposed and analyzed thermodynamically. The COP of the EHP is improved by using binary fluids (HFE7500 and water), and the high backpressure in the primary ejector ( ... ...

    Abstract A gas-fired air-to-water ejector heat pump (EHP) for domestic hot water production is proposed and analyzed thermodynamically. The COP of the EHP is improved by using binary fluids (HFE7500 and water), and the high backpressure in the primary ejector (first-stage) is actively controlled by either a second-stage ejector and/or a LiBr-H₂O absorption subsystem. A thermodynamic model is established for analysis and performance evaluation. A case study shows the backpressure of the first-stage ejector is reduced by 53.5%, and the backpressure control using the second-stage ejector increases the system COP by 21.0% compared with that using LiBr-H₂O absorption. Parametric studies are conducted to investigate the roles of the first-stage ejector, the second-stage ejector, and the LiBr-H₂O absorption subsystem. The first-stage ejector plays a dominant role in the EHP system performance. The EHP’s heating COP can reach 2.0 with an entrainment ratio of 0.12 in the first-stage ejector. EHP performance can be improved with a high entrainment ratio and a low-temperature primary working fluid in the first-stage and second-stage ejectors, a low condensation temperature in the first-stage ejector, and a high generating temperature and a low concentration of the LiBr-H₂O solution.
    Keywords absorption ; administrative management ; case studies ; condensation (phase transition) ; energy conversion ; exhibitions ; fluids ; heat pumps ; temperature ; thermodynamic models ; water
    Language English
    Dates of publication 2021-0215
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2020.113761
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  10. Article ; Online: Low cost and scalable method for modifying surfaces of hollow particles from hydrophilic to hydrophobic.

    Sharma, Jaswinder / Polizos, Georgios / Hun, Diana / Nawaz, Kashif / Sahore, Ritu

    RSC advances

    2020  Volume 10, Issue 52, Page(s) 31065–31069

    Abstract: Hydrophobic hollow silica particles are desirable for several applications such as hydrophobic coatings, thermal insulation, and thermally resistant insulative paints. However, converting hydrophilic particles into hydrophobic particles without ... ...

    Abstract Hydrophobic hollow silica particles are desirable for several applications such as hydrophobic coatings, thermal insulation, and thermally resistant insulative paints. However, converting hydrophilic particles into hydrophobic particles without compromising their structural integrity is challenging. In this work, we present a low cost strategy to modify the surface of hollow silica particles from hydrophilic to hydrophobic without compromising their structural integrity.
    Language English
    Publishing date 2020-08-21
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d0ra06114j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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