High Level Of Similarity Research Articles

Analysis of Changes in Soot Content in Engine Oils under Operating Conditions

Oil has an enormous influence on the condition of the engine. Determining its degradation allows companies to maximize the availability of a specific vehicle and fleet of vehicles in general. In the evolution of engine oil degradation, one of the variables considered to be the most important is soot content. This article examines the direction and severity of soot content and dispersion changes in engine oil occurring during actual engine operation during four complete change intervals. The oil under study was operated in a city bus. It belonged to the fleet of vehicles of a transport company from new to the mileage of about 200,000 km. Soot content was determined in accordance with ASTM E2412-10, while dispersion size was determined using the dried drop test in accordance with ASTM D7899. The results obtained provide the basis for the conclusion that the direction of change in soot content in each interval is characterized by a high degree of homogeneity. With respect to the degree of soot build-up, a high level of similarity was observed between the intervals studied. The study of change in the degree of oil dispersion using the “drop on blotter” method made it possible to confirm the trend of decreasing dispersion as the run increases. The obtained results led to the development of a statistical model describing these relationships.

The UK’s new free trade agreements in the Asia-Pacific: how closely is it adopting US trade regulation?

In a global economy and system increasingly defined by new developments and complexities in trade, whose rules and regulations govern that trade matter. The UK has embarked on a new post-Brexit trade policy, signing its first wholly new free trade agreements (FTAs) with Australia and New Zealand. It is also in negotiations to join the Comprehensive and Progressive Trans-Pacific Partnership (CPTPP) as part of the UK’s aspirations to become an integral part of the Asia-Pacific trading community. This study’s research and text analysis on the UK’s bilateral FTAs with Australia and New Zealand reveals high levels of similarity with two larger regional agreements heavily imprinted with US trade regulatory norms—this being the CPTPP itself and the United States–Mexico–Canada Agreement (USMCA). The UK’s revealed willingness to strongly align itself with US trade regulatory norms has important implications for the Asia-Pacific. It also raises some key issues on what kind of trade partner the region might expect a post-Brexit ‘Global Britain’ to become, and how the UK’s deeper planned engagement with the Asia-Pacific could affect its strategic dynamics. This could significantly depend on how closely the UK is pulled over time into the US’ trade regulatory orbit.

Examining the potential influence of crosslinguistic lexical similarity on word-choice transfer in L2 English.

We examined whether and how L1-L2 crosslinguistic formal lexical similarity influences L2 word choice. Our sample included two learner subcorpora, containing 8,500 and 6,390 English texts, written in an educational setting, by speakers of diverse L1s in the A1-B2 CEFR range of L2 proficiency. We quantified similarity based on phonological overlap between L1 words and their L2 (English) translations. This similarity relates to psycholinguistic cognancy, which occurs when words and their translations share a high level of formal similarity, often due to historical cognancy from shared etymology or language contact. We then used mixed-effects statistical models to examine how this similarity influences the rate of use of the L2 words; essentially, we checked whether L2 words that are more similar to their L1 translations are used more often. We also controlled for potential confounds, including the baseline L1 frequency of the English words. The type of crosslinguistic similarity that we examined did not influence learners' choice of L2 words in their writing in the present sample, which represents a type of educational setting that many learners encounter. This suggests that the influence of such similarity is constrained, and that communicative needs can override transfer from learners' L1 to their L2, which raises questions regarding when and how else situational factors can influence transfer.

Facilitation of a free-roaming apex predator in working lands: evaluating factors that influence leopard spatial dynamics and prey availability in a South African biodiversity hotspot.

Apex predators ideally require vast intact spaces that support sufficient prey abundances to sustain them. In a developing world, however, it is becoming extremely difficult to maintain large enough areas to facilitate apex predators outside of protected regions. Free-roaming leopards (Panthera pardus) are the last remaining apex predator in the Greater Cape Floristic Region, South Africa, and face a multitude of threats attributable to competition for space and resources with humans. Using camera-trap data, we investigated the influence of anthropogenic land modification on leopards and the availability of their natural prey species in two contrasting communities-primarily protected (Cederberg) and agriculturally transformed (Piketberg). Potential prey species composition and diversity were determined, to indicate prey availability in each region. Factors influencing spatial utilisation by leopards and their main prey species were also assessed. Estimated potential prey species richness (Cederberg = 27, Piketberg = 26) and diversity indices (Cederberg-H' = 2.64, Ds = 0.90; Piketberg-H' = 2.46, Ds = 0.89), supported by both the Jaccard's Index (J = 0.73) and Sørensen's Coefficient (CC = 0.85), suggested high levels of similarity across the two regions. Main leopard prey species were present in both regions, but their relative abundances differed. Grey rhebok, klipspringer, and rock hyrax were more abundant in the Cederberg, while Cape grysbok, Cape porcupine, chacma baboon, and common duiker were more abundant in Piketberg. Leopards persisted across the agriculturally transformed landscape despite these differences. Occupancy modelling revealed that the spatial dynamics of leopards differed between the two regions, except for both populations preferring areas further away from human habitation. Overall, anthropogenic factors played a greater role in affecting spatial utilisation by leopards and their main prey species in the transformed region, whereas environmental factors had a stronger influence in the protected region. We argue that greater utilisation of alternative main prey species to those preferred in the protected region, including livestock, likely facilitates the persistence of leopards in the transformed region, and believe that this has further implications for human-wildlife conflict. Our study provides a baseline understanding of the potential direct and indirect impacts of agricultural landscape transformation on the behaviour of leopards and shows that heavily modified lands have the potential to facilitate mammalian diversity, including apex predators. We iterate that conservation measures for apex predators should be prioritised where they are present on working lands, and encourage the collaborative development of customised, cost-effective, multi-species conflict management approaches that facilitate coexistence.

Whole-genome sequence analysis of a novel orthobunyavirus isolated in Japan in the 1980s.

Two viruses isolated from Culicoides biting midges in Japan and preserved in a frozen state for over three decades were genetically characterized by next-generation sequencing. The viruses have a tripartite RNA genome with the typical coding strategy of orthobunyaviruses. They also share a high level of genetic similarity and are thus regarded as isolates of the same virus. Pairwise sequence comparisons and phylogenetic analysis including viruses of the Simbu serogroup demonstrated that the new viruses are members of clade A of this serogroup. In addition, a discrepancy in the phylogenetic trees indicated that a genetic reassortment had occurred in the evolution of the studied viruses. The L protein of the virus reported here showed no more than 94.6% amino acid sequence identity to that of any other Simbu serogroup virus, indicating that it should be regarded as a novel virus according to a criterion for species definition in the genus Orthobunyavirus. Therefore, this novel virus is tentatively named 'Taniyama virus' based on the location where the infected midges were collected.

Evaluating the urban environment to improve quality of life in Srinagar, India: the use of the Urban Landscape Quality Index

ABSTRACT Rapid urbanisation puts significant pressure on the quality of life for urban residents, creating major challenges for urban planners. Access to accurate and timely data to inform municipal planning decisions adds to these challenges. This article investigates the potential of an Urban Landscape Quality Index (ULQI) model, which is based on visual assessments of the urban environment. The article compares the results of the ULQI with those from a more resource-intensive data collection process using landscape quality perception surveys with city inhabitants. The results from the study in Srinagar city, India, suggest that there is a high level of similarity between the results from the ULQI approach and residents’ surveys. This indicates that visual assessment of landscape to calculate ULQI is an efficient approach and can be used by urban planners to prioritise those areas that need immediate attention.

Genome-wide identification of olive flounder (Paralichthys olivaceus) SOCS genes: Involvement in immune response regulation to temperature stress and Edwardsiella tarda infection

The suppressors of cytokine signaling (SOCS) gene family participates in development and immunity through negative regulation of cytokine signaling pathways. Although the immune response of SOCS gene family members has been extensively characterized in teleost, no similar study has been reported in olive flounder yet. In our present study, a total of 13 SOCSs in olive flounder were identified and characterized systematically. By querying the SOCS sequences of ten teleost fish species, we found there were exactly more members of SOCSs in fish than mammals, which indicated that there were more duplication events occurred in fish than in higher vertebrates. Phylogenetic analysis clearly illuminated that SOCS genes were highly conserved. The analysis of gene structure and motif showed SOCS proteins of olive flounder shared a high level of sequence similarity strikingly. The expression profiles of tissues and developmental stages indicated that SOCS members had a kind of specificity in temporality and spatiality. RNA–Seq analysis of temperature stress and E. Tarda infection demonstrated SOCS members were involved in inflammatory response. In a word, our results would provide a further reference for understanding the mechanism of SOCS genes in olive flounder.

High Security Image Cryptographic Algorithm Using Chaotic Encryption Algorithm with Hash-LSB Steganography

In the latest, digital images are frequently used for storage, communication, medical imaging, etc. Such images possibly involve private data, which accordingly handed an important role to information security. Image encryption and steganography are two widely used techniques for providing information security. Cryptography is the technique of protecting information by encryption and decryption. In steganography, the message is inserted in an image with changes entitled a cover image. The principal purpose of the study is to improve the current secure data communication techniques, by combining cryptography with steganography. Steganography and cryptography are two examples of the multiple methods used to guarantee secrecy and privacy throughout data communication. The suggested approach achieves encryption and decryption utilizing chaotic encryption technique and employing hash-least significant bit (HLSB) as steganography which is a significant method of embedding data bits in LSB bits of RGB pixels of the cover image.  The suggested image encryption method is validated by experimental results to be highly secure and resistant to a variety of attacks. Additionally, compared to several conventional picture encryption techniques, it offers higher performance. Peak signal-to-noise ratio (PSNR) and mean square error (MSE)calculations are used to provide security evaluations. PSNR is infinite and MSE is 0 for a secret image. PSNR and MSE for the cover image are 65 and 0.02 dB respectively. The results of this research reveal a high level of similarities between stego and cover images, and between recovered and secret images, as seen in the histogram analysis of secret images. These techniques are accomplished effectively by using the MATLAB program.

Genome Analysis of Two Lichen Bacteriobionts, <i>Lichenibacterium</i> <i>ramalinae</i> and <i>Lichenibacterium minor</i>: Factors of Virulence and Adaptation

Successful invasion and adaptation of bacteria into lichen symbiosis requires the involvement of a number of physiological mechanisms that regulate interactions between bacteriobionts, mycobionts and algobionts and ensure the optimization of thallus growth and development. The genomes of two lichen bacteriobionts Lichenibacterium ramalinae and L. minor were analysed to identify those factors. No nodulation genes traditional for rhizobia were found. TIGR02302 protein has been suggested to have a similar function. Genes encoding proteins associated with the implementation of planktonic and biofilm phenotypes – flagellins and pilins – have been found. These genes have a high level of similarity with the genes of plant symbiont bacteria. Genetic determinants of virulence factors such as locus B invasion proteins, Integration host factor (IHF), sensory histidine kinases, siderophore receptor and transport proteins and monooxygenase of antibiotic synthesis (Abm) were found in the genomes of the studied bacteria. The listed genes have similarities with those in organisms forming associations of different degrees of association with plants. Based on the data obtained, the assumption of a priority association of bacteria of the Lichenibacteriaceae family with green lichen algae was suggested.

Formamide-Free Genomic In Situ Hybridization (ff-GISH).

Fluorescence in situ hybridization allows for the mapping of various sequence types in the genomes and is thus widely used in structural, functional, and evolutionary studies. One particular type of in situ hybridization that specifically allows to map whole parental genomes in diploid and polyploid hybrids is genomic in situ hybridization (GISH). The efficiency of GISH, i.e., the specificity of hybridization of genomic DNA probes to the parental subgenomes in hybrids depends, among others, on the age of the polyploids and the similarity of the parental genomes, specifically their repetitive DNA fractions. Typically, high levels of overall repeat similarity between the parental genomes result in lower efficiency of GISH. Here, we present the formamide-free GISH (ff-GISH) protocol that can be applied to diploid and polyploid hybrids of both monocots and dicots. ff-GISH allows higher efficiency of the labeling of the putative parental genomes compared to the standard GISH protocol and allows discrimination of parental chromosome sets that share up to 80-90% repeat similarity. This modified method is nontoxic, is simple, and lends itself to modifications. It can also be used for standard FISH and mapping of individual sequence types in chromosomes/genomes.

Genomic analysis of an outbreak of toxin gene bearing Corynebacterium diphtheriae in Northern Queensland, Australia reveals high level of genetic similarity.

Toxigenic diphtheria is rare in Australia with generally fewer than 10 cases reported annually; however, since 2020, there has been an increase in toxin gene-bearing isolates of Corynebacterium diphtheriae cases in North Queensland, with an approximately 300% escalation in cases in 2022. Genomic analysis on both toxin gene-bearing and non-toxin gene-bearing C. diphtheriae isolated from this region between 2017 and 2022 demonstrated that the surge in cases was largely due to one sequence type (ST), ST381, all of which carried the toxin gene. ST381 isolates collected between 2020 and 2022 were highly genetically related to each other, and less closely related to ST381 isolates collected prior to 2020. The most common ST in non-toxin gene-bearing isolates from North Queensland was ST39, an ST that has also been increasing in numbers since 2018. Phylogenetic analysis demonstrated that ST381 isolates were not closely related to any of the non-toxin gene-bearing isolates collected from this region, suggesting that the increase in toxigenic C. diphtheriae is likely due to the expansion of a toxin gene-bearing clone that has moved into the region rather than an already endemic non-toxigenic strain acquiring the toxin gene.

Phylogenetic analysis of all available monkeypox virus strains shows the close relatedness of contemporary ones

The present research aimed to evaluate the diversity of all monkeypox virus strains with a special focus on recently isolated ones by a comprehensive phylogenetic analysis of all available sequences, based on the concatenate of four viral genes. Almost all current strains from 2022 showed a high level of similarity to each other on the analyzed stretches: 218 strains shared identical sequence. Among all analyzed strains, the highest number of differences was counted compared to a RefSeq strain (Zaire-96-I-16) on the whole concatenate. Our analysis supported the distinction between Clade I (formerly Congo Basin clade), IIa and IIb (together formerly West African clade) strains and classified all 2022 strains in the last one. The high number of differences and long branch observable concerning strain Zaire-96-I-16 is most probably caused by a sequencing error. As this strain represents one of the two available reference sequences in GenBank, it is recommendable to confirm or exclude the concerning mutation. The developed method, based on four gene sequences, reflected the established whole-genome-based intraspecies classification. Although this method provides significantly less information about the strains compared to whole genome analyses, since its resolution is much lower, it still enables the rapid subspecies classification of the strains into the established clades. The genes in the analyzed concatenate are so conserved that further differentiation of contemporary strains is impossible; these strains are identical in the analyzed sections. On the other hand, since whole genome analyses are compute-intensive, the described method offers a simpler and more accessible alternative for monitoring and preliminary typing of newly sequenced monkeypox virus strains.

Assessment of Crested Wheatgrass (Agropyron cristatum L. Gaertn.) Populations for the Agro-Morphological and the Quality Traits under Semiarid Condition

Crested wheatgrass [Agropyron cristatum L. (Gaertn.)] is high adaptability to semiarid and arid regions, and also has good forage quality and palatability. The required new varieties have been improved by effective breeding programs for hay production and rangeland revegetation in arid and semi-arid conditions. The objectives of this study were to identify the agro-morphological and quality traits of the three advanced populations and the control population in crested wheatgrass. The advanced population G-465 was 7.68 and 1.92 t ha-1 in overall averages of fresh forage and hay yields, respectively. According to these values, it is seen that the G-465 advanced population is 5.93, and 6.07% higher than the control population in terms of both fresh forage and hay yields, respectively. Besides, no significant differences seemed among the study populations in crude protein content and relative feed value in 2015 and two-year averages. Consequently, the G-465 advanced population was good performance under semiarid conditions and it is advisable for similar circumstances. For identifying yield-related traits, correlation analysis was performed and high correlation coefficients occurred between fresh forage yield with stem diameter (0.474**), internode length (0.469**), flag leaf length (0.761**), and flag leaf width (0.711**). In light of these data, these traits should be taken into account in the selection of phenotypic plants. Moreover, cluster analysis was also done and its results showed that high similarity levels occurred between fresh forage yield and flag leaf length (88.06%), and between plant height and internode length (78.73%).

Genetic diversity of the Chinese medicinal plant Astragali Radix based on transcriptome-derived SSR markers

BackgroundAstragali Radix is regarded as an important traditional medicinal plant and has been widely used as a Qi-Invigoratin medicine for more than 2000 years. However, the mechanism of its medicinal and nutritional components in different accessions is unexplored. Moreover, the lack of SSR markers for Astragali Radix has stalled genetic breeding and variety identification. To develop EST-SSRs, transcriptome sequencing was performed based on the Illumina platform. ResultsApproximately 99.6 million raw data points were collected, and 296,618 unigenes with an average length of 1,459 bp were obtained. A total of 71,207 SSR loci within 56,097 SSR-containing unigenes were identified. Of these SSR-containing unigenes, 26,188 (46.7%), 16,736 (29.8%), and 8,858 (15.8%) were related to items in the GO database, KEGG database, and COG database, respectively. The motifs A/T, AG/CT, AT/AT, and AAT/ATT were the most common types, accounting for 39.78%, 19.14%, 10.12%, and 4.60%, respectively, and the average length of the EST-SSRs was 17.16 bp. We acquired 8 functional markers linked to key genes correlated with the biosynthesis of flavonoids. The genetic similarity among the 60 AR varietal resources ranged from 0.2692 to 0.8077, with an average of 0.5742. The dendrogram results indicated that the 60 AR samples tested had high levels of genetic similarity. ConclusionsThe 71,207 EST-SSR loci identified here offer valuable source of DNA markers for the genetic diversity identification of 60 Astragali Radix varieties. These results will facilitate genetic map construction, functional gene identification, variety identification, molecular marker-assisted breeding, and genetic diversity analysis in Astragali Radix.How to cite: Jiang M, Yan S, Ren W, et al. Genetic diversity of the Chinese medicinal plant Astragali Radix based on transcriptome-derived SSR markers. Electron J Biotechnol 2023;62. https://doi.org/10.1016/j.ejbt.2022.12.001.

FTIR fingerprinting combined with chemometrics of Guiera senegalensis leaf powder

Guiera senegalensis is a shrub that grows up to a height of 3 to 5 m and has tremendous medicinal properties. However, there is difficulty in the identification of medicinal plants leading to substitution of one plant for another. This problem can be addressed by establishing fingerprints of the medicinal plants. The aim of this research is to establish FTIR fingerprint of G. senegalensis leave. G. senegalensis leave were collected from the wild in Jigawa, Kaduna and Zamfara states, shade dried and size reduced. Samples (2 mg) were analysed in triplicate using Agilent technologies FTIR Carry 630 in the mid-IR region 4000-650 cm-1 at resolution 8 cm-1 with 16 scans. The level of similarity and differences was determined by Chemometrics using similarity and discriminant analysis. The level of differences between the samples was insignificant (p<0.05) as indicated by low values of eigenvalue (0.048) and canonical correlation (0.215) as well as high Wilks’ Lambda value (0.954). High level of similarity between the samples was further proven by their correlation and Tuckers’ congruence coefficients values, which were close to unity. However, significant (p<0.05) difference in the concentration of phytochemicals was observed between the samples. The Guiera senegalensis leaf samples were similar with respect to their phytochemical constituents however, differences in the phytochemical concentrations were observed.

Ranking-based contrastive loss for recommendation systems

The recommendation system is fundamental technology of the internet industry intended to solve the information overload problem in the big data era. Top-k recommendation is an important task in this field. It generally functions through the comparison of positive pairs and negative pairs based on Bayesian personalized ranking (BPR) loss. We find that the contrastive loss (CL) function used in contrastive learning is well-suited for top-k recommendation. However, there are two problems in the existing loss functions. First, all samples are treated the same, and hard samples are not considered. Second, all nonpositive samples are considered negative samples, which ignores the fact that they are unlabelled data containing items that users may like. Moreover, in our experiments, we find that when items are sorted by their similarities to the user, many negative items (or samples) appear before the positive items. We regard these negative items as hard samples and those at the top as potentially positive samples due to their high level of similarities with users. Therefore, we propose a ranking-based contrastive loss (RCL) function to exploit both hard samples and potentially positive samples. Experimental results demonstrate the effectiveness, broad applicability, and high training efficiency of the proposed RCL function. The code and data are available at https://github.com/haotangxjtu/RCL.

New Echinoderes (Kinorhyncha: Cyclorhagida) from Mexico: Molecular barcoding demonstrate species delimitation between highly similar morphospecies

Two new species of Echinoderes are described from Mexico. Echinoderes abeli sp. nov. is described from the archipelago Islas Marias in the Mexican Pacific Ocean west coast. The species is characterized by very short and stout lateral terminal spines, middorsal spines on segments 4 to 8 and lateroventral spines on segments 6 to 9, lateroventral tubes on segment 2 and 5, midlateral tubes on segment 4, and sublateral ones on segment 8, and in laterodorsal positions on segment 10, as well as glandular cell outlets type 2 in subdorsal positions segment 2. The second new species, Echinoderes wilberti sp. nov. is described from the Caribbean coast in Yucatan. The new species show great resemblance with another species, Echinoderes horni, that occurred at the same locality. The only notable difference is a pair of subdorsal tubes on segment 2, present in E. wilberti sp. nov. only. However, barcoding of COI demonstrated the two morphospecies differed genetically more than 8%. This result shows that small morphological differences might be supported by much more conspicuous molecular differences. Based on the high level of morphological similarity between E. wilberti sp. nov. and E. horni, as well as a third Caribbean species, Echinoderes parahorni, a species group, the E. horni group, is proposed to accommodate this potentially monophyletic group of species.This article is registered at www.zoobank.org under urn: lsid: zoobank.org:pub: 5AE5C820-C922-492B-83F3-66C957E53453.

Retrospective analysis of the potential use of virtual control groups in preclinical toxicity assessment using the eTOX database

Virtual Control Groups (VCGs) based on Historical Control Data (HCD) in preclinical toxicity testing have the potential to reduce animal usage. As a case study we retrospectively analyzed the impact of replacing Concurrent Control Groups (CCGs) with VCGs on the treatment-relatedness of 28 selected histopathological findings reported in either rat or dog in the eTOX database. We developed a novel methodology whereby statistical predictions of treatment-relatedness using either CCGs or VCGs of varying covariate similarity to CCGs were compared to designations from original toxicologist reports; and changes in agreement were used to quantify changes in study outcomes. Generally, the best agreement was achieved when CCGs were replaced with VCGs with the highest level of similarity; the same species, strain, sex, administration route, and vehicle. For example, balanced accuracies for rat findings were 0.704 (predictions based on CCGs) vs. 0.702 (predictions based on VCGs). Moreover, we identified covariates which resulted in poorer identification of treatment-relatedness. This was related to an increasing incidence rate divergence in HCD relative to CCGs. Future databases which collect data at the individual animal level including study details such as animal age and testing facility are required to build adequate VCGs to accurately identify treatment-related effects.

Genetic Diversity Assessment of Sweetpotato Germplasm in China Using InDel Markers

Sweetpotato (Ipomoea batatas (L.) Lam.), whose roots are rich in starch, is widely grown around the world and plays a prominent role in ensuring food security. At present, there are no reports on the genetic diversity of sweetpotato germplasm revealed by InDel markers. In this study, we developed a set of 30 InDel markers to evaluate the genetic diversity and relationships of 240 accessions, comprising 77 landraces, 80 introduced accessions, 82 improved varieties released in China, and a diploid wild relative Ipomoea trifida. A total of 94 reliable loci were obtained, with a mean of 3.13 loci per primer, and the PIC value ranged from 0.143 to 0.821. The whole population could be divided into three sub-populations according to a structure analysis based on the Bayesian model, which was consistent with the results of principal component analysis (PCA). A neighbor-joining tree was constructed based on Nei’s genetic distance ranging from 0 to 0.556 and discriminated the panel of the population into three main groups (Ⅰ, Ⅱ, Ⅲ). Group Ⅲ was further split into seven subgroups (ⅢA–ⅢG). The clustering pattern of the 240 accessions was unrelated to their geographic origins. Most of the accessions, whether landraces, improved varieties released in China or introduced germplasm, were mixed, which revealed the high level of genetic similarity among accessions from different regions. There was little difference in the level of genetic diversity between landraces and improved varieties, which was probably due to the exchange and utilization of accessions from different regions. More efforts should be made to collect and utilize sweetpotato germplasm resources and further broaden the genetic basis of sweetpotato cultivars.

The complete mitochondrial genome of Tuta absoluta (Lepidoptera: Gelechiidae) and genetic variation in two newly invaded populations in China

• The size of mitogenome sequences in T. absoluta varied among individuals from different geographical locations. • The differences in the lengths of intergenic spacer were contributed to the size difference of mitogenomes among different populations. • cox2 , atp6 , nad1 and nad5 genes were sensitive mitochondrial gene markers for population genetics in T. absoluta . Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is a devastating invasive pest worldwide, causing severe damage to tomatoes. Recently, it has been recorded in the northwestern and southwestern parts of China. Here, the mitogenomes and genetic variation of two newly invaded T. absoluta populations in Xinjiang and Yunnan, were determined. The results showed that the complete mitogenome size of T. absoluta is 15298 bp for the individual from Xinjiang and 15296 bp for the individual from Yunnan, which were both longer than the reported mitogenome from Spain (15290 bp). The mitogenome sequences of individuals collected from three locations showed high levels of sequence similarity, except for 8 polymorphic sites, which were in genes cox2 (1 site), cox3 (2 sites), cob (1 site) , atp6 (1 site), nad1 (2 sites) and nad5 (1 site). Tuta absoluta mitogenomes share many features with other 6 Gelechiidae mitogenomes, except for several differences in the start and stop codons of protein-coding genes and the length of intergenic spacers. Seven partial mitochondrial genes ( cox1 , cox2 , cox3 , atp6 , cob , nad1 , and nad5 ) were used for genetic variation analysis, and significant population differentiation was found between the two populations based on cox2 , atp6 , nad1 , and nad5 . The complete mitogenomes and sensitive mitochondrial gene markers reported here provide useful data for further population genetics study of this pest.