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Search: WFRF:(Kumar Shashi)

  • Result 1-10 of 91
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1.
  • Gorai, Priya Kumari, et al. (author)
  • C1QA and COMP: plasma-based biomarkers for early diagnosis of pancreatic neuroendocrine tumors
  • 2023
  • In: Scientific Reports. - : Springer Nature. - 2045-2322. ; 13:1
  • Journal article (peer-reviewed)abstract
    • Pancreatic Neuroendocrine tumors (PanNET) are challenging to diagnose and often detected at advanced stages due to a lack of specific and sensitive biomarkers. This study utilized proteomics as a valuable approach for cancer biomarker discovery; therefore, mass spectrometry-based proteomic profiling was conducted on plasma samples from 12 subjects (3 controls; 5 Grade I, 4 Grade II PanNET patients) to identify potential proteins capable of effectively distinguishing PanNET from healthy controls. Data are available via ProteomeXchange with the identifier PXD045045. 13.2% of proteins were uniquely identified in PanNET, while 60% were commonly expressed in PanNET and controls. 17 proteins exhibiting significant differential expression between PanNET and controls were identified with downstream analysis. Further, 5 proteins (C1QA, COMP, HSP90B1, ITGA2B, and FN1) were selected by pathway analysis and were validated using Western blot analysis. Significant downregulation of C1QA (p = 0.001: within groups, 0.03: control vs. grade I, 0.0013: grade I vs. grade II) and COMP (p = 0.011: within groups, 0.019: control vs grade I) were observed in PanNET Grade I & II than in controls. Subsequently, ELISA on 38 samples revealed significant downregulation of C1QA and COMP with increasing disease severity. This study shows the potential of C1QA and COMP in the early detection of PanNET, highlighting their role in the search for early-stage (Grade-I and Grade-II) diagnostic markers and therapeutic targets for PanNET.
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2.
  • Kumar, Harsh, et al. (author)
  • The long-active afterglow of GRB 210204A : detection of the most delayed flares in a gamma-ray burst
  • 2022
  • In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 513:2, s. 2777-2793
  • Journal article (peer-reviewed)abstract
    • We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the afterglow at 7.6 x 10(5) s and 1.1 x 10(6) s after the burst: the most delayed flaring ever detected in a GRB afterglow. At the source redshift of 0.876, the rest-frame delay is 5.8 x 10(5) s (6.71 d). We investigate possible causes for this flaring and conclude that the most likely cause is a refreshed shock in the jet. The prompt emission of the GRB is within the range of typical long bursts: it shows three disjoint emission episodes, which all follow the typical GRB correlations. This suggests that GRB 210204A might not have any special properties that caused late-time flaring, and the lack of such detections for other afterglows might be resulting from the paucity of late-time observations. Systematic late-time follow-up of a larger sample of GRBs can shed more light on such afterglow behaviour. Further analysis of the GRB 210204A shows that the late-time bump in the light curve is highly unlikely due to underlying SNe at redshift (z) = 0.876 and is more likely due to the late-time flaring activity. The cause of this variability is not clearly quantifiable due to the lack of multiband data at late-time constraints by bad weather conditions. The flare of GRB 210204A is the latest flare detected to date.
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3.
  • Kumar, Vinod, et al. (author)
  • Bread waste : A potential feedstock for sustainable circular biorefineries
  • 2023
  • In: Bioresource Technology. - : Elsevier BV. - 0960-8524 .- 1873-2976. ; 369
  • Research review (peer-reviewed)abstract
    • The management of staggering volume of food waste generated (∼1.3 billion tons) is a serious challenge. The readily available untapped food waste can be promising feedstock for setting up biorefineries and one good example is bread waste (BW). The current review emphasis on capability of BW as feedstock for sustainable production of platform and commercially important chemicals. It describes the availability of BW (>100 million tons) to serve as a feedstock for sustainable biorefineries followed by examples of platform chemicals which have been produced using BW including ethanol, lactic acid, succinic acid and 2,3-butanediol through biological route. The BW-based production of these metabolites is compared against 1G and 2G (lignocellulosic biomass) feedstocks. The review also discusses logistic and supply chain challenges associated with use of BW as feedstock. Towards the end, it is concluded with a discussion on life cycle analysis of BW-based production and comparison with other feedstocks.
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4.
  • Ahuja, Vishal, et al. (author)
  • Microbial alchemy : upcycling of brewery spent grains into high-value products through fermentation
  • 2023
  • In: Critical reviews in biotechnology. - : Taylor & Francis. - 0738-8551 .- 1549-7801.
  • Research review (peer-reviewed)abstract
    • Spent grains are one of the lignocellulosic biomasses available in abundance, discarded by breweries as waste. The brewing process generates around 25–30% of waste in different forms and spent grains alone account for 80–85% of that waste, resulting in a significant global waste volume. Despite containing essential nutrients, i.e., carbohydrates, fibers, proteins, fatty acids, lipids, minerals, and vitamins, efficient and economically viable valorization of these grains is lacking. Microbial fermentation enables the valorization of spent grain biomass into numerous commercially valuable products used in energy, food, healthcare, and biomaterials. However, the process still needs more investigation to overcome challenges, such as transportation, cost-effective pretreatment, and fermentation strategy. to lower the product cost and to achieve market feasibility and customer affordability. This review summarizes the potential of spent grains valorization via microbial fermentation and associated challenges.
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6.
  • Kasliwal, Mansi M., et al. (author)
  • Kilonova Luminosity Function Constraints Based on Zwicky Transient Facility Searches for 13 Neutron Star Merger Triggers during O3
  • 2020
  • In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 905:2
  • Journal article (peer-reviewed)abstract
    • We present a systematic search for optical counterparts to 13 gravitational wave (GW) triggers involving at least one neutron star during LIGO/Virgo's third observing run (O3). We searched binary neutron star (BNS) and neutron star black hole (NSBH) merger localizations with the Zwicky Transient Facility (ZTF) and undertook follow-up with the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration. The GW triggers had a median localization area of 4480 deg(2), a median distance of 267 Mpc, and false-alarm rates ranging from 1.5 to 10(-25) yr(-1). The ZTF coverage in the g and r bands had a median enclosed probability of 39%, median depth of 20.8 mag, and median time lag between merger and the start of observations of 1.5 hr. The O3 follow-up by the GROWTH team comprised 340 UltraViolet/Optical/InfraRed (UVOIR) photometric points, 64 OIR spectra, and three radio images using 17 different telescopes. We find no promising kilonovae (radioactivity-powered counterparts), and we show how to convert the upper limits to constrain the underlying kilonova luminosity function. Initially, we assume that all GW triggers are bona fide astrophysical events regardless of false-alarm rate and that kilonovae accompanying BNS and NSBH mergers are drawn from a common population; later, we relax these assumptions. Assuming that all kilonovae are at least as luminous as the discovery magnitude of GW170817 (-16.1 mag), we calculate that our joint probability of detecting zero kilonovae is only 4.2%. If we assume that all kilonovae are brighter than -16.6 mag (the extrapolated peak magnitude of GW170817) and fade at a rate of 1 mag day(-1) (similar to GW170817), the joint probability of zero detections is 7%. If we separate the NSBH and BNS populations based on the online classifications, the joint probability of zero detections, assuming all kilonovae are brighter than -16.6 mag, is 9.7% for NSBH and 7.9% for BNS mergers. Moreover, no more than <57% (<89%) of putative kilonovae could be brighter than -16.6 mag assuming flat evolution (fading by 1 mag day(-1)) at the 90% confidence level. If we further take into account the online terrestrial probability for each GW trigger, we find that no more than <68% of putative kilonovae could be brighter than -16.6 mag. Comparing to model grids, we find that some kilonovae must have M-ej M, X-lan > 10(-4), or > 30 degrees to be consistent with our limits. We look forward to searches in the fourth GW observing run; even 17 neutron star mergers with only 50% coverage to a depth of -16 mag would constrain the maximum fraction of bright kilonovae to <25%.
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10.
  • Andreasson, Daniel, et al. (author)
  • Improving BE traffic QoS using GT slack in NoC Systems
  • 2005
  • In: Proceedings of 23th IEEE Norchip Conference, 21 - 22 Nov, Oulu, Finland.
  • Conference paper (peer-reviewed)abstract
    • Recently, network on chip (NoC) architectures are beingproposed for implementing multi-core systems for realtimemulti-media applications. The communicationtraffic of those systems will be a mix of guaranteedthroughput (GT) and best effort (BE) traffic. GT trafficnot only lead to under-utilization of communication linksand routers, but also leads to degradation of QoSparameters for BE traffic. We propose a dynamic routingscheme for reducing jitter in the latency of BE trafficaffected by the GT traffic. Our results from modeling andsimulation indicate that a significant improvement injitter can be achieved.
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  • Result 1-10 of 91
Type of publication
conference paper (58)
journal article (15)
reports (6)
research review (4)
book chapter (3)
licentiate thesis (3)
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editorial collection (1)
doctoral thesis (1)
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Type of content
peer-reviewed (72)
other academic/artistic (12)
pop. science, debate, etc. (7)
Author/Editor
Kumar, Shashi (71)
Hemani, Ahmed (24)
Holsmark, Rickard (21)
Jantsch, Axel (17)
Palesi, Maurizio (17)
Ellervee, Peeter (10)
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Svantesson, Bengt (10)
Bengtsson, Tomas (9)
Öberg, Johnny (8)
Jutman, Artur (8)
Ubar, Raimund (7)
Kumar, Shashi, 1952- (6)
Mubeen, Saad (5)
Catania, V (5)
Andreasson, Daniel (4)
Kumar, Shashi, Profe ... (4)
Kumar, Anshul (4)
Lindqvist, Dan (4)
Meincke, Thomas (4)
Peng, Zebo (3)
Mehariya, Sanjeet (3)
Yang, Yung-Hun (3)
Sander, Ingo (3)
Postula, Adam (3)
Forsell, Martti (3)
Soininen, Juha-Pekka (3)
Millberg, Mikael (3)
Olsson, Thomas (2)
Perley, Daniel A. (2)
Nilsson, Peter (2)
Kool, Erik C. (2)
Eles, Petru, Profess ... (2)
Tenhunen, Hannu (2)
Ahuja, Vishal (2)
Bhatia, Shashi Kant (2)
Kumar, Gopalakrishna ... (2)
Ahumada, Tomas (2)
Coughlin, Michael W. (2)
Andreoni, Igor (2)
Kumar, Harsh (2)
Bhalerao, Varun (2)
Yao, Yuhan (2)
Anupama, G. C. (2)
Barway, Sudhanshu (2)
Bertozzi, Davide (2)
Riddle, Reed (2)
Johansson, Alf (2)
Bengtsson, Tomas, 19 ... (2)
Dutta, Anirban (2)
Öberg, Johnny (2)
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University
Jönköping University (49)
Royal Institute of Technology (28)
Linköping University (5)
Mälardalen University (4)
Umeå University (3)
Stockholm University (3)
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University of Gothenburg (2)
Luleå University of Technology (2)
Lund University (1)
University of Borås (1)
Karolinska Institutet (1)
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Language
English (86)
Swedish (5)
Research subject (UKÄ/SCB)
Engineering and Technology (42)
Natural sciences (26)
Medical and Health Sciences (2)
Agricultural Sciences (1)
Social Sciences (1)

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