27,330 research outputs found

    THE QUALITY OF CRUDE OIL FROM THE MUANDA FIELD AND ITS CONSEQUENCES ON THE INSTALLATIONS

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    The study on the quality of the crude oil of the Muanda field and its consequences on the installations, was carried out within the framework of our scientific research of study of Advanced Diploma (DEA). The objective of this study was to determine upstream the physical properties and composition of the Muanda field crude oil, in order to determine the conditions of asphaltene deposits in the tubing and other installations. To achieve this, the samples collected in the field were analysed in our laboratories and at the PVT Laboratory of Sonangol in Luanda to constitute the results of this manuscript. The results of these analyses show that the crude oil of the Muanda field is a Medium Crude Oil (29.7°API) on the API density scale with the hypothesis of two sources: one of Light Oil, the other of Medium Oil). These two sources of crude oil, induce the establishment of two oils of different viscosities and pour points of which one more viscous (Mu 23) and the other less viscous (Mu 16 and Mu 2) having the average pour point at 15° C (60°F). The Standing correlation gave acceptable results and close to those of the Electromagnetic Viscometer (EMV). The chemical composition showed that the crude oil is composed of 18.63% of gas and 81.37 % of Paraffins and Asphaltenes, and that this oil is of low sulfur content type (Low Sulfur Content (LSC) <0.6% weight). A solid sample collected from the oil field was characterized through melting, further heating and solidification point (28° C)

    Different application procedures of Nd:YAG laser as an adjunct to scaling and root planning in smokers with stage III grade C periodontitis: a single-blind, randomized controlled trial

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    Background The aim of the present study was to evaluate whether different Nd:YAG laser applications as an adjunct to scaling and root planning (SRP) improve the healing response to periodontal therapy in smokers with periodontitis. Methods This clinical trial included eighty systemically healthy smokers with periodontitis. Patients were randomly allocated to a treatment group: SRP alone (group 1), SRP+low-level laser therapy (LLLT) with Nd:YAG laser (group 2), SRP+pocket debridement with ND:YAG laser (group 3), and SRP+combined pocket debridement and LLLT with Nd:YAG laser (group 4). Gingival index (GI), plaque index (PI), bleeding on probing (%), probing depth (PD), and clinical attachment level (CAL) were recorded, and gingival crevicular fluid (GCF) samples for metalloproteinase-8 (MMP-8) levels were collected at baseline, 1 month and 3 months after treatment. Results There were no significant differences between the treatment groups for the GI, PI, and BOP (%) parameters and MMP-8 levels at any time points (p > 0.05). For moderately deep pockets, PD and CAL reductions were significantly greater in all test groups compared to group 1 (p 0.05) except PD reduction between baseline and 3 months in deep pockets (p < 0.05). Conclusions The findings of this clinical trial suggest that Nd:YAG laser applications may be beneficial on the healing response of smokers to non-surgical therapy compared to SRP alone

    Efektivitas Proses Pembelajaran di Masa Pandemi

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    Efektivitas Proses Pembelajaran di Masa Pandem

    Polymorphisms associated with susceptibility to dental caries

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    The susceptibility to present and develop dental caries is closely linked to the host genome. The main objective of this research is to identify, categorize and define the genes and their main polymorphisms which through experimental methods have been associated with susceptibility to dental caries. Genes involved in the development of enamel, as well as genes related to the preference for sweet tastes have been associated with susceptibility to dental caries. Among the genes involved in the development of enamel whose polymorphisms have an impact on this susceptibility are AMEL, ENAM, AMBN, MMP TUFT1 and KLK4, and the genes associated with taste whose polymorphisms are associated with TAS1R2 and TAS1R3. In addition, within these genes, polymorphisms have been discovered that act in a protective manner against carious lesions

    Characterization of physiochemical and nutrient profiles in canola feedstocks and co-products from bio-oil processing: impacted by source origin

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    Objective The objective of this study was to characterize physiochemical and nutrient profiles of feedstock and co-products from canola bio-oil processing that were impacted by source origin. The feedstocks and co-products (mash, pellet) were randomly collected from five different bio-oil processing plants with five different batches of samples in each bio-processing plant in Canada (CA) and China (CH). Methods The detailed chemical composition, energy profile, total digestible nutrient (TDN), protein and carbohydrate subfractions, and their degradation and digestion (CNCPS6.5) were determined. Results The results showed that TDN1x was similar in meals between CA and CH. CH meals and feedstock had higher, truly digestible crude protein (tdCP) and neutral detergent fiber (tdNDF) than CA while CA had higher truly digestible non-fiber carbohydrate (tdNFC). The metabolizable energy (ME3x), net energy (NELp3x, NEm3x, and NEg3x) were similar in meals between CA and CH. No differences were observed in energy profile of seeds between CA and CH. The protein and carbohydrate subfractions of seeds within CH were similar. The results also showed that pelleting of meals affected protein sub-fractionation of CA meals, except rapidly degradable fractions (PB1), rumen degradable (RDPB1) and undegrdable PB1 (RUPB1), and intestinal digestible PB1 (DIGPB1). Canola meals were different in the soluble (PA2) and slowly degradable fractions (PB2) between CA and CH. The carbohydrate fractions of intermediately degradable fraction (CB2), slowly degradable fraction (CB3), and undegradable fraction (CC) were different among CH meals. CH presented higher soluble carbohydrate (CA4) and lower CB2, and CC than CA meals. Conclusion The results indicated that although the seeds were similar within and between CA and CH, either oil-extraction process or meal pelleting seemed to have generated significantly different aspects in physiochemical and nutrient profiles in the meals. Nutritionists and producers need to regularly check nutritional value of meal mash and pellets for precision feeding

    KANTOR BARU DINAS KOMUNIKASI, INFORMATIKA, STATISTIK DAN PERSANDIAN KOTA SEMARANG DENGAN PENDEKATAN ARSITEKTUR EKOLOGIS

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    Dinas Komunikasi, Informatika, Statistik dan Persandian (Kominfo) Kota Semarang dalam pekerjaannya memiliki peran sebagai pengelola layanan e-government serta bidang-bidang lain yang terkait pelaksanaan hal tersebut, termasuk juga infrastrukturnya. Berdasarkan hasil pengamatan lapangan dan fenomena, diketahui bangunan yang digunakan sebagai fasilitas bekerja; Kantor Administrasi, Pusat Data dan Pusat Kendali Smart City masih belum optimal sesuai tuntutan fungsi serta kurang mampu mengakomodasi kebutuhan dari perkembangan kedepan secara ideal. Dari situ dilihat adanya potensi perancangan kantor baru Dinas Kominfo Kota Semarang yang optimal untuk kegiatan operasionalnya dan juga siap untuk mengakomodasi kebutuhan perkembangan kedepan. Hal ini juga sejalan dengan rencana Pemerintah Kota Semarang mengenai pengembangan bangunan kantor pelayanan publik. Proyek ini berupa kegiatan merancang kompleks bangunan kantor baru Dinas Kominfo dimana terdapat; kantor administrasi, pusat data dan pusat kendali smart city dalam satu lahan menggunakan pendekatan Arsitektur Ekologis. Hasil desain ditujukan sebagai bentuk kontribusi terhadap isu perkembangan layanan e-government dan keselarasan keberadaan-hubungan bangunan dengan pengguna serta lingkungannya. Permasalahan yang ditemui; pertama adalah mengenai penerapan pelingkup yang merespon kondisi klimatik selagi turut berkontribusi terhadap kesehatan dan kualitas kinerja ruang yang baik. Kemudian mengenai hubungan bentuk, tata massa bangunan dengan tapaknya. Terakhir mengenai bentuk, makna dan ekspresi bangunan ditengah prospek pengembangan lingkungan sekitarnya. Dari keseluruhan pertimbangan, pendekatan desain yang digunakan adalah Arsitektur Ekologis dimana dalam aplikasinya mengusahakan keselarasan relasi atau hubungan timbal-balik yang baik antar pengguna, bangunan dan lingkungannya

    Why was the heat wave in the Yangtze River valley abnormally intensified in late summer 2022?

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    A record-breaking heat wave hit the Yangtze River valley during the boreal summer of 2022, and caused severe social and economic losses. One prominent feature of this long-lived heat event was its persistence and abnormal intensification in August. This study investigated the physical mechanisms be responsible for the intensification of this heat event in late summer under the background of a La Niña event. The prolonged heat event was directly related to the intensification and westward extension of the western North Pacific subtropical high (WNPSH), which can be attributed to the synergistic effects of an anomalous western North Pacific (WNP) anticyclone and the eastward extension of the South Asian high (SAH) in the upper troposphere. The anomalous anticyclone in the WNP, which was induced by negative sea surface temperature anomalies in the central tropical Pacific, strengthened in August. The positive sea surface temperature anomaly in the western Pacific warm pool and enhanced in-situ convection led to anomalous high pressure over the Yangtze River valley via the local meridional circulation. Atmospheric convergence and descending motion over the Yangtze River valley was amplified in August as a result of the zonal shift in the SAH from the Iranian Plateau to the Tibetan Plateau. The Silk Road pattern (SRP) index of August 2022 was the lowest since the 1990s. The abnormal negative phase of the SRP contributed to both the zonal shift in the SAH and the westward extension of the WNPSH, which led to the abnormal intensification of the heat event over the Yangtze River valley in August 2022

    Evaluation of the quality and safety of cows' milk when using the mineral elements

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    A successful feeding program should solve the following problems: achieving planned milk production, increasing dry matter intake and improving ruminal microbiota. As an integral part of the diet, feed additives have an impact on the animal's body, which is expressed, for example, in an increase in average daily weight gain, a decrease in conversion, an improvement in metabolic metabolism and so on. However, it should be noted that feed additives alone do not guarantee of high productivity or profitability of milk production. The purpose of these studies was to evaluate the effect of the multicomponent feed additive Felucen on the sanitary quality and safety of cows' milk. The studies were conducted on the basis of training and experimental farm, where two groups of dairy cows, 40 heads each, were formed according to the principle of analogues. All cows of both groups received the basic diet accepted on the farm. Additionally, the first group received Felucen feed additive at the rate of 5 g per 1 kg of body. Analysis of the milk composition and productivity was carried out on the 10th, 30th, 60th and 90th day. The use of Felucen provided an increase in the milk productivity of cows by 11% and an increase in the quality indicators of milk: the mass fraction of fat increased by 0.11%, protein - by 0.21%, lactose - by 0.20%

    Illustrations of the SeqFold2D network and the Stralign dataset.

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    (A) The two-module architecture of the SeqFold2D models. An input RNA sequence of length L is first embedded via one-hot encoding and feed-forward layers to yield an L×C tensor. The first module consists of N blocks of either bidirectional Long-Short-Term-Memory (LSTM) or transformer encoders. The resultant L×C tensor is then transformed into the L×L×C pair representation via outer-product, before being fed to the second module of N blocks of residual 2D convolutional layers. The output block is made up of three feed-forward layers and predicts the PPM of dimension L×L. (B) The population distributions of eight RNA families at different sequence similarity levels for the Stralign dataset. The abbreviations are, rRNA: ribosomal RNA, tRNA: transfer RNA, Intron I: group I intron, tmRNA: transfer messenger RNA, SRP: signal recognition particle, and TERC: telomerase RNA component. The innermost ring shows the original Stralign dataset with a total of 37,149 sequences, noting that the five under-represented families (counter-clockwise from Intron I to TERC) are scaled up for visibility and the multiplier N is shown as “N×” in the label (see Fig A in S1 Text for the unscaled version). The L600 ring is after removing sequences longer than 600; the NR100 ring shows the cross-sequence level; and the NR80 ring shows the cross-cluster level. Note that the 16S rRNA NR80 has only 50 sequences and is barely visible.</p

    Salinity stress endurance of the plants with the aid of bacterial genes

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    The application of plant growth-promoting bacteria (PGPB) is vital for sustainable agriculture with continuous world population growth and an increase in soil salinity. Salinity is one of the severe abiotic stresses which lessens the productivity of agricultural lands. Plant growth-promoting bacteria are key players in solving this problem and can mitigate salinity stress. The highest of reported halotolerant Plant growth-promoting bacteria belonged to Firmicutes (approximately 50%), Proteobacteria (40%), and Actinobacteria (10%), respectively. The most dominant genera of halotolerant plant growth-promoting bacteria are Bacillus and Pseudomonas. Currently, the identification of new plant growth-promoting bacteria with special beneficial properties is increasingly needed. Moreover, for the effective use of plant growth-promoting bacteria in agriculture, the unknown molecular aspects of their function and interaction with plants must be defined. Omics and meta-omics studies can unreveal these unknown genes and pathways. However, more accurate omics studies need a detailed understanding of so far known molecular mechanisms of plant stress protection by plant growth-promoting bacteria. In this review, the molecular basis of salinity stress mitigation by plant growth-promoting bacteria is presented, the identified genes in the genomes of 20 halotolerant plant growth-promoting bacteria are assessed, and the prevalence of their involved genes is highlighted. The genes related to the synthesis of indole acetic acid (IAA) (70%), siderophores (60%), osmoprotectants (80%), chaperons (40%), 1-aminocyclopropane-1-carboxylate (ACC) deaminase (50%), and antioxidants (50%), phosphate solubilization (60%), and ion homeostasis (80%) were the most common detected genes in the genomes of evaluated halotolerant plant growth-promoting and salinity stress-alleviating bacteria. The most prevalent genes can be applied as candidates for designing molecular markers for screening of new halotolerant plant growth-promoting bacteria
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