Studies on Cenchrus ciliaris Pollen Extract and Cross-Reactivity Among Tropical Grasses of the Family Poaceae

Author(s):  
Susheela Sridhara ◽  
Lalit Kumar ◽  
Jyotsna Verma ◽  
B.P. Singh ◽  
Sharad Gangal
Author(s):  
Mahmoud Ahmed Ebada ◽  
Notila Fayed ◽  
Souad Alkanj ◽  
Ahmed Wadaa Allah

: Enterovirus D68 (EV-D68) is a single-stranded positive-sense RNA virus, and it is one of the family Picornaviridae. Except for EV-D68, the family Picornaviridae has been illustrated in literature. EV-D68 was first discovered and isolated in California, USA, in 1962. EV-D68 has resulted in respiratory disorders’ outbreaks among children worldwide, and it has been detected in cases of various neurological diseases such as acute flaccid myelitis (AFM). A recent study documented a higher number of EV-D68 cases associated with AFM in Europe in 2016 compared to the 2014 outbreak. EV-D68 is mainly diagnosed by quantitative PCR, and there is an affirmative strategy for EV-D68 detection by using pan-EV PCR on the untranslated region and/or the VP1 or VP2, followed by sequencing of the PCR products. Serological tests are limited due to cross-reactivity of the antigens between the different serotypes. Many antiviral drugs for EV-D68 have been evaluated, and showed promising results. In our review, we discuss the current knowledge about EV-D68 and its role in the development of AFM.


2018 ◽  
Vol 10 (10) ◽  
pp. 30
Author(s):  
Sharon Sherry Huang ◽  
Erick Ceasar Huang ◽  
Chao Shen Huang

The Zika Virus (ZIKV) was propelled to international attention during its outbreak from 2015-2016. Interestingly, the most recent outbreak was not ZIKV’s first, although it proved to be the most widespread and impactful, with millions affected in South America, Asia and Africa. Presently no longer considered a global emergency, ZIKV has managed to invoke fear and realization of the susceptibility of the global population to rapidly evolving viruses. In addition, the difficulty of diagnosing the virus demonstrates a deficiency in a rapid, virus specific, and accurate diagnostic tool for the family of flaviviruses that ZIKV belongs to. This paper reviews the approved identification methods along with an analysis of the advantage and disadvantages of each, as well as emerging alternative approaches in ZIKV diagnosis. Common problems with currently utilized methods include slow turnover time, limited throughput, need for further testing to confirm diagnosis, narrow sample compatibility, and cross reactivity to DENV and other similar viruses, Although newer methods discussed in the paper, namely Electrogenerated Chemiluminescence (ECL) and Reporter Virus Neutralization Test (RVNT), show improvement in throughput quantity, speed, and efficiency, it is not certain whether these tests are virus specific and will not react in the presence DENV. The rapidity of diagnosis is important in ensuring timely access to treatment as well as tracking and containing future possible epidemics, Concurrently, virus specificity is equally crucial in ensuring correct diagnosis. Thus, the challenge lies in finding the balance between the two.


1978 ◽  
Vol 18 (94) ◽  
pp. 732 ◽  
Author(s):  
C Johansen

The response to Mo application of Panicum maximum var. trichoglume cv. Gatton (panic), Cenchrus ciliaris cv. Biloela (buffel) and Setaria sphacelata cv. Nandi (setaria) was studied at three rates of NO3 supply in pots containing soil that was severely Mo deficient for tropical legumes. There were no growth responses of these grasses to Mo, except for a marginally significant effect in panic at the highest NO3 treatment at the first harvest. These results are compared with Mo responses of legume/grass mixtures in the field and published data showing large growth responses of some temperate grasses to Mo. Application of Mo had no effect on total N concentrations of grass tops but markedly decreased NO3-N concentrations in buffel. Setaria had a greater ability to take up Mo than the other grasses and this was associated with the lower NO3 levels in this species. Critical Mo concentrations for growth of all grasses were below 0.02 p.p.m.


1978 ◽  
Vol 29 (2) ◽  
pp. 261 ◽  
Author(s):  
DA Ivory ◽  
PC Whiteman

The variability in foliar freezing resistance within and between five Cenchrus ciliaris, four Setaria anceps and six Chloris gayana ecotypes was examined in the laboratory over a sequence of freezing temperatures between –1.0° and –6.25°C. C. gayana and S. anceps ecotypes were generally more frost-resistant than C. ciliaris ecotypes. No significant differences in frost susceptibility were found in C. ciliaris, whilst S. anceps exhibited the greatest variability and C. gayana showed an intermediate degree of variability. The range of freezing temperatures which caused 50% foliage death (LT50) in C. ciliaris was –1.8° to –2.1°, in C. gayana –2.6° to –3.5° and in S. anceps –2.1° to –4.3°. ____________________ * Part I, Aust. J. Agric. Res., 29: 243 (1978).


2014 ◽  
Vol 66 (3) ◽  
pp. 1149-1155 ◽  
Author(s):  
Ivana Aleksic ◽  
Olga Vuckovic ◽  
Katarina Smiljanic ◽  
Marija Gavrovic-Jankulovic ◽  
Vera Krsmanovic ◽  
...  

According to the data obtained from in vivo and in vitro testing in Serbia, a significant number of patients have allergic symptoms caused by grass pollen. We examined the protein composition of grass pollens (Dactylis glomerata, Lolium perenne and Phleum pratense) and cross-reactivity in patients allergic to grass pollen from our region. The grass pollen allergen extract was characterized by SDS-PAGE, while cross-reactivity of single grass pollens was revealed by immunoblot analysis. A high degree of cross-reactivity was demonstrated for all three single pollens in the sera of allergic patients compared to the grass pollen extract mixture. Confirmation of the existence of cross-reactivity between different antigenic sources facilitates the use of monovalent vaccines, which are easier to standardize and at the same time prevent further sensitization of patients and reduces adverse reactions.


2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Bárbara Batista Salgado ◽  
Fábio Carmona de Jesus Maués ◽  
Renato Lemos Pereira ◽  
Jannifer Oliveira Chiang ◽  
Maria Nazaré de Oliveira Freitas ◽  
...  

Abstract Background The emergence and re-emergence of infectious diseases are a cause for worldwide concern. The introduction of Zika and Chikungunya diseases in the Americas has exposed unforeseen medical and logistical challenges for public health systems. Moreover, the lack of preventive measures and vaccination against known and emerging mosquito-transmitted pathogens, and the occurrence of unanticipated clinical complications, has had an enormous social and economic impact on the affected populations. In this study, we aimed to measure the seroprevalence of endemic and emerging viral pathogens in military personnel stationed in Manaus, Amazonas state. Methods We measured the seropositivity of antibodies against 19 endemic and emerging viruses in a healthy military personnel group using a hemagglutination inhibition assay (HIA). Results Overall, DENV positivity was 60.4%, and 30.9% of the individuals reacted against ZIKV. Also, 46.6%, 54.7%, 51.3% and 48.7% individuals reacted against West Nile virus (WNV), Saint Louis encephalitis virus (SLEV), Ilheus virus (ILHV) and Rocio virus (ROCV), respectively. Individuals with high DENV HIA titer reacted more frequently with ZIKV or WNV compared to those with low HIA titers. Observed cross-reactivity between Flaviviruses varied depending on the virus serogroup. Additionally, 0.6% and 0.3% individuals were seropositive for Oropouche virus (OROV) and Catu virus (CATUV) from the family Peribunyaviridae, respectively. All samples were negative for Eastern Equine Encephalitis virus (EEEV), Western Equine Encephalomyelitis virus (WEEV), Mayaro virus (MAYV), Mucambo virus (MUCV) and CHIKV from the family Togaviridae. Conclusions A high proportion of individuals in our high-risk population (~ 60%) lacked antibodies against major endemic and emerging viruses, which makes them susceptible for further infections. Military personnel serving in the Amazon region could serve as sentinels to strengthen global infectious disease surveillance, particularly in remote areas. Graphical abstract


2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Clara Alessandrello ◽  
Luca Gammeri ◽  
Serena Sanfilippo ◽  
Raffaele Cordiano ◽  
Silvia Brunetto ◽  
...  

AbstractLime (Citrus aurantiifolia) is a plant belonging to the family of Rutaceae and to the genus Citrus. The fruit is widely used in the United States, Mexico, Southeast Asia, Latin America, but is increasingly widespread all over the world. It is used as a fresh fruit, in the preparation of foods, sweets and drinks and its oils are used in the cosmetic and pharmaceutical industry. The main adverse reactions to lime seem to be represented by contact dermatitis, allergic and phototoxic type. In the context of allergic forms, several allergens have been identified in the citrus family, the main one being limonene, but no noteworthy cross-reactivity has been identified. However, a case of fruit protein contact dermatitis has been described, showing sensitization to other fruits, such as kiwi, avocado, pineapple and apple. There are several molecules responsible for phototoxic reactions and mainly belonging to the coumarin and furocoumarins families. Reactions related to ingesting the fruit or inhaling pollen from the tree appear to be rare, as there are no known cases reported in the literature. The increasing diffusion of lime in Europe must pay attention to possible adverse reactions due to contact with this fruit, which seem destined to increase in future years. Further importance must be placed on patch tests and on the possibility of using alternative extracts to classic fragrance mixes.


2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Payam Morakabati ◽  
Mohammad-Ali Assarehzadegan ◽  
Gholam Reza Khosravi ◽  
Bahareh Akbari ◽  
Fatemeh Dousti

Sensitisation to Amaranthus retroflexus pollen is very common in tropical and subtropical countries. In this study we aimed to produce a recombinant allergenic Ole e 1-like protein from the pollen of this weed. To predict cross-reactivity of this allergen (Ama r 1) with other members of the Ole e 1-like protein family, the nucleotide sequence homology of the Ama r 1 was investigated. The expression of Ama r 1 in Escherichia coli was performed by using a pET-21b(+) vector. The IgE-binding potential of recombinant Ama r 1 (rAma r 1) was evaluated by immunodetection and inhibition assays using 26 patients’ sera sensitised to A. retroflexus pollen. The coding sequence of the Ama r 1 cDNA indicated an open reading frame of 507 bp encoding for 168 amino acid residues which belonged to the Ole e 1-like protein family. Of the 26 serum samples, 10 (38.46%) had significant specific IgE levels for rAma r 1. Immunodetection and inhibition assays revealed that the purified rAma r 1 might be the same as that in the crude extract. Ama r 1, the second allergen from the A. retroflexus pollen, was identified as a member of the family of Ole e 1-like protein.


1987 ◽  
Vol 99 (3) ◽  
pp. 641-646 ◽  
Author(s):  
Carmen Pelaz ◽  
Luis García Albert ◽  
Cecilia Martin Bourgon

SUMMARYCross-reactions of 17 members of the family Legionellaceae were studied by four different serological techniques: immunofluorescence (IF), slide agglutination (SA), microagglutination (MA) and immunodiffusion (ID), using antigens and rabbit antisera prepared in our laboratory. Results obtained corresponded closely with those described by other authors, especially for IF and SA.The 17 antigens were further tested by IF with a panel of sera previously diagnosed as positive for legionella. A high number of positive reactions with several of the antigens tested were found, half of them being positive forLegionella pneumophilaserogroup 1, usually in combination with other serogroups or species. The remaining sera presented a great variety of patterns combining different antigens.


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