Four radio frequency (RF) heating systems with a power of 2 kW and four frequencies of 6.78, 13.56, 27.12, and 40.68 MHz were used to compare the effect of different frequencies on drying characteristics, disinfestation efficacy and product quality of in-shell walnuts. The results showed that with the increase of frequency, the average walnut temperature rose from 70.87 ± 5.59 °C to 76.16 ± 5.83 °C and the heating uniformity index dropped significantly (P   0.05), but significant differences were observed in peroxide value (PV) and free fatty acid (FFA) (P

Effects of various radio frequencies on combined drying and disinfestation treatments for in-shell walnuts

To develop an efficient simultaneous drying and disinfesting treatment for in-shell walnuts, a 2.4 kW, 27.12 MHz 50 Ω radio frequency (RF) system and a two-stage strategy were applied to investigate the effects of electrode gap, heating rate, and transition temperature on drying characteristics, disinfesting efficacy, and product quality. Peroxide value (PV) and free fatty acid (FFA) of walnuts with different packages during accelerated storage were also evaluated. The electrode gap of 160 mm for one-stage drying was selected for further investigations since it can ensure a short processing time (210 min), 100% mortality of C. cephalonica larvae, and eligible PV (0.183 meq/kg) and FFA (0.128%). The two-stage strategy with the heating rate of 5 °C/min and transition temperature of 55 °C shortened the drying duration to 170 min by nearly 20%, improved the heating uniformity index from 0.075 to 0.064, and reduced crack ratio from 43.75 to 26.04% significantly (P

Simultaneous hot-air assisted radio frequency drying and disinfestation for in-shell walnuts using a two-stage strategy

Cheyletus malaccensis Oudemans is a predatory mite inhabiting grain depots in China. The relationship between temperature and the population growth rate of C. malaccensis is useful for predicting its population dynamics. Age-stage, two-sex life tables of the predator, C. malaccensis, reared on Acarus siro were constructed under laboratory conditions at 22, 24, 28, 30, and 32 °C, 75% relative humidity, and a 0:24 h (L:D) photoperiod. Increasing temperature shortened the development time of the immature stages. The complete generation time of C. malaccensis ranged from 11.10 d to 27.50 d. Life table parameters showed that 28 °C was the optimum temperature for the growth and development of C. malaccensis; populations could increase rapidly at this temperature. The highest net reproductive rate (R0 = 290.25) and highest fecundity (544.52) occurred at 28 °C. Temperature significantly affected the intrinsic rate of increase (r), fecundity, and finite rate of increase (λ). The values of age-specific fecundity (high to low) were 28 °C > 24 °C > 30 °C > 32 °C > 22 °C, while the values of age-stage-specific fecundity had the same trend.

https://www.mdpi.com/2075-4450/11/3/181/pdf

Age-Stage, Two-Sex Life Tables of the Predatory Mite Cheyletus Malaccensis Oudemans at Different Temperatures.

Omosita colon (Linnaeus, 1758) (Coleoptera: Nitidulidae) is an economically important storage pest worldwide and a forensically important beetle. The first complete mitochondrial genome (mitogenome...

Characterization of the complete mitochondrial genome of Omosita colon (Coleoptera: Nitidulidae).

Simple Summary To improve the control of stored-grain pests and protect the environment, the use of natural enemies is attracting increasing attention. Cheyletus malaccensis and Cheyletus eruditus are effective natural enemies of common stored-grain pests, such as Liposcelis bostrychophila Badonnel. To evaluate the predation potential of these two types of predatory mites, this study was conducted by comparing the life histories of two predatory mites and the functional responses on Liposcelis bostrychophila. The results indicate that compared to C. eruditus, C. malaccensis had a shorter development time and longer adult survival time at 28 °C and 75% RH and showed higher predation ability against Liposcelis bostrychophila eggs. It has been proven from both its life history of artificial breeding and the predation ability that C. malaccensis has much greater biocontrol potential than C. eruditus against stored-grain pests. Abstract Cheyletus malaccensis Oudemans and Cheyletus eruditus (Schrank) are predators of stored-grain pests in China. The psocid Liposcelis bostrychophila Badonnel is prone to outbreaks in depots. To assess the potential of large-scale breeding with Acarus siro Linnaeus and the biological control potential of C. malaccensis and C. eruditus against L. bostrychophila, we determined the development times of different stages at 16, 20, 24, and 28 °C and 75% relative humidity (RH) while feeding on A. siro, as well as the functional responses of both species’ protonymphs and females to L. bostrychophila eggs at 28 °C and 75% RH. Cheyletus malaccensis had a shorter development time and longer adult survival time than C. eruditus at 28 °C and 75% RH and could establish populations faster than C. eruditus while preying on A. siro. The protonymphs of both species showed a type II functional response, while the females showed a type III functional response. Cheyletus malaccensis showed a higher predation ability than C. eruditus, and the females of both species had a higher predation ability than the protonymphs. Based on the observed development times, adult survival times, and predation efficiency, Cheyletus malaccensis has much greater biocontrol potential than C. eruditus.

/pdf/life-histories-and-functional-responses-of-two-predatory-19j1mseu.pdf

Life Histories and Functional Responses of Two Predatory Mites Feeding on the Stored-Grain Pest Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae)

Effect of radio frequency heating on the mortality of Rhizopertha dominica (F.) and its impact on grain quality

Carpophilus dimidiatus (Fabricius, 1792) and Carpophilus pilosellus Motschulsky are two sibling species and economically important storage pests worldwide. The first complete mitochondrial (mt) genomes of both were sequenced using next-generation sequencing. The mt genomes of C. dimidiatus and C. pilosellus are circular, with total lengths of 15,717 bp and 15,686 bp, respectively. Gene order and content for both species are similar to what has been observed in ancestral insects and consist of 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes, and a control region. Comparing the mt genome data of C. dimidiatus and C. pilosellus, they are similar in organization, arrangement patterns, GC contents, transfer RNA (tRNA) secondary structures, and codon usage patterns. Small differences were noted with regards to the nucleotide similarity of coding regions and the control region. This is the first publication of the complete mitochondrial genomes of two sibling species. The mt genome sequences can supplement the nuclear markers of the Carpophilus genus in research species identification, system evolution, and population genetic structure, and also will be valuable molecular marker for further genetic studies.

https://www.mdpi.com/2075-4450/11/1/24/pdf

The First Complete Mitochondrial Genomes of Two Sibling Species from Nitidulid Beetles Pests.

Cheyletus malaccensis (Oudemans) is a species of predatory mite, which is widely distributed in grain storage, and is a potential natural enemy of stored-product pests. Based on the typical temperatures and humidities that occur in granaries, the growth and development of C. malaccensis was studied at 24°C with different relative humidities (RH 65±2%, 75±2%, 85±2% and 95±2%). During this study, C. malaccensis was fed on Acarus siro (Linnaeus), a very important stored grain pest to investigate its potential to control this pest and production of this natural enemy in the laboratory. The results showed that C. malaccensis has five developmental stages, egg, larva, protonymph, deutonymph and adult. The deutonymph stage is absent in males. For females, the developmental time from egg to adult was shortest at 85±2 % RH and averaged 16.3 days; developmental time was longest at 65±2 % RH and averaged 18.6 days. The male mites in the 95±2% RH trials had the shortest developmental time which averaged 12.6 days; it was longest at 65±2% RH where it averaged 14.7 days. At 95±2% RH, the male adult lived 83.5 d and its longevity from egg to adult was 95.8 d. Humidity had a significant effect on how long the adults lived and the duration of all developmental stages. At 85±2 % RH, the maximum average number of eggs per female, oviposition period and daily fecundity were 493.0, 46.2 d, and 10.3, respectively. This study provides basic biological parameters for C. malaccensis, a potential biological control agent for mite pests infesting stored grain.

/pdf/a-preliminary-study-of-growth-and-development-of-cheyletus-52kbixinnq.pdf

A preliminary study of growth and development of Cheyletus malaccensis (Oudemans) under different humidity conditions

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Weiwei Sun

Author Tools

Chat about Author

Papers

Age-Stage, Two-Sex Life Tables of the Predatory Mite Cheyletus Malaccensis Oudemans at Different Temperatures.

Effect of radio frequency heating on the mortality of Rhizopertha dominica (F.) and its impact on grain quality

The First Complete Mitochondrial Genomes of Two Sibling Species from Nitidulid Beetles Pests.

A preliminary study of growth and development of Cheyletus malaccensis (Oudemans) under different humidity conditions