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Contributions to the knowledge of Antarctodon sobrali(Mammalia:Astrapotheria)from the Eocene of Antarctica

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Advances in Polar Science 2024年第1期35卷 48-62页

作者： Javier n.GELFO Consejo nacional de Investigaciones Científicasy Técnicas(COnICET) Buenos Aires C1425FQBArgentina División Paleontología Vertebrados Museo de La PlataFacultad de Ciencias Naturales y Museo de La PlataUniversidad Nacional de La PlataLa Plata B1900FWAArgentina

The Astrapotheria constitutes one of the five orders of extinct South American native ungulates,with a fossil record that also extends to the Eocene of the Antarctic *** contrast to the abundant specimens known for litoptern Sparnotheriodontidae and metatherians,astrapotheres are represented by scant remains assigned to the endemic Antarctodon sobrali and indeterminate astrapotheres,restricted to levels 35C_(u0)and 35n of the Cucullaea I Allomember of the La Meseta *** discovery of alower molar assignable to this species in the Eocene levels of Seymour(Marambio)Island,enables a revision of the diagnosis and the homologies of the dental characters used to describe this taxon.A reanalysis of its phylogenetic relationships reveals the nearly simultaneous presence of basal astrapotheres in the early Eocene of Itaboraí(Brazil),Patagonia,and West *** taxa are characterized by lacking dental specializations usually associated with more abrasive diets like terminal forms of Uruguaytheriinae and *** appears to have thrived on the Antarctic continent during the Early Eocene Climatic Optimum within the paleoclimatic context of a hot-house *** present conditions in Antarctica where no terrestrial mammals inhabit,the early Eocene climate was characterized by warmer temperatures and a biologically diverse environment rich in primary producers,dominated by nothofagus forests,encompassing both deciduous and evergreen forests,which supported a diverse assemblage of continental vertebrates.

关键词： Astrapotheria Antarctodon Eocene Seymour Island La Meseta Formation

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nanomotion of bacteria to determine metabolic profile

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nanotechnology and Precision Engineering 2024年第1期7卷 1-9页

作者： S.n.Pleskova E.V.Lazarenko n.A.Bezrukov R.n.Kriukov A.V.Boryakov M.E.Dokukin S.I.Surodin Research Laboratory of Scanning Probe Microscopy Lobachevsky State University of Nizhny NovgorodNizhny Novgorod 603950Russia Department of nanotechnology and Biotechnology Nizhny Novgorod State Technical University n.a.R.E.AlekseevNizhny Novgorod 603950Russia Sarov Physics and Technology Institute National Research Nuclear University MEPhISarov 607186Russia

In addition to their visible motion such as swimming(e.g.,with the help ofﬂagella),bacteria can also exhibit nanomotion that is detectable only with highly sensitive instruments,and this study shows that it is possible to detect bacterial nanomotion using an AFM detection *** results show that the nanomotion characteristics depend on the bacterial strain,and that nanomotion can be used to sense the metabolic activity of bacteria because the oscillations are sensitive to the food preferences of the bacteria and the type of surrounding medium.

关键词： nanomotion Bacteria Cantilever Oscillation Atomic force microscopy Metabolism

Change in mean postoperative pain in patients undergoing tonsillectomy with cold water versus usual practice:A pragmatic trial

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World Journal of Otorhinolaryngology-Head and neck Surgery 2024年第1期10卷 24-28页

作者： Haissan Iftikhar nida Zahid Adan Zubair mohammad Wasif nabeel n.Baig Khadijah Abid Muhammad Ozair Awan Muhammad Sohail Awan Department of Otolaryngology Queen Elizabeth HospitalBirminghamUK Department of Surgery Aga Khan University HospitalKarachiPakistan College of Physicians and Surgeons Higher Education CommissionKarachiPakistan Department of UGME Aga Khan UniversityKarachiPakistan

Introduction:Tonsillectomy is one of the most common procedures performed in *** are various methods to perform tonsillectomies(cold and hot).Thermal damage and inflammation of the surrounding tissue using monopolar cautery is said to point to increased pain whereas immediate cooling of the burnt area is thought to reduce pain owing to heat *** objective was to determine the difference in mean post‐tonsillectomy pain scores among patients irrigated with cold water(4℃)and in patients not irrigated with cold *** and Methods:A quasi‐experimental trial was conducted from January 2016 to December 2017 at a tertiary care *** tonsillectomies were carried out with monopolar cautery at a power of 20 *** either received cold water irrigation post tonsillectomy of the tonsillar bed(intervention arm)or no irrigation(control arm).The pain score was measured on Days 0,1,3,5,and *** scores were charted on a visual analog scale on the respective ***:Seventy‐eight patients were included in the *** mean age of our patients was 10.26(4.24)years old in the intervention arm,and 11.95(4.19)years old in the control *** was observed that the pain was significantly lower in patients with cold water irrigation of the tonsillar fossa on Days 1,3,5,and 7(p=0.001).There were no readmissions postprocedure and none of our patients developed any complications ***:In this trial,we report a reduced pain score at all days of observation in the intervention *** of the tonsillar fossa is a safe,cost-effective,and less technically demanding technique that could be employed to reduce postoperative *** studies with randomization,blinding and a larger sample size could further improve on our results.

关键词： cold water tonsillectomy monopoalr tonsillectomy postoperative pain tonsillectomy

Using fused filament fabrication to improve the tribocorrosion behaviour of 17-4 PH SS in comparison to other metal forming techniques

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Friction 2024年第10期12卷 2325-2343页

作者： Cristina GARCÍA-CABEZÓn Juan Alfonso nARAnJO Celia GARCÍA-HERnÁnDEZ Cristina BERGES Gemma HERRAnZ Fernando MARTÍn-PEDROSA Materials Engineering E.I.I.Universidad de ValladolidValladolid 47011Spain InEI-Escuela Técnica Superior de Ingeniería Industrial(ETSII) Universidad de Castilla La ManchaCastilla-La Mancha 13071Spain

Fused filament fabrication(FFF)is one of the additive manufacturing processes which has gained more interest because of its simplicity and *** technology is similar to the conventional metal injection moulding(MIM)process,consisting of the feedstock preparation of metal powder and polymer binders,followed by layer-by-layer 3D printing(FFF)or injection(MIM)to create green parts and,finally,debinding and ***,both technologies provide near-dense *** work presents an in-depth study of the processing method’s *** porosity,microstructure,hardness,corrosion,and tribocorrosion behaviour are compared for 17-4 PH SS samples processed from powder by additive manufacturing using FFF and MIM,as well as conventional powder metallurgy(PM)*** samples exhibited the highest macro and microhardness,while corrosion behaviour was similar for both MIM and FFF samples,but superior in comparison to conventional PM ***,the FFF-as fabricated samples displayed a significant improvement in tribocorrosion resistance that could be explained by the higher proportion of delta ferrite and retained austenite in their microstructure.

关键词： 17-4 PH SS fused filament fabrication(FFF) metal injection moulding(MIM) corrosion behaviour powder metallurgy(PM) tribocorrosion behaviour

Ultrahigh thermoelectric properties of p‐type Bi_(x)Sb_(2−x)Te_(3)thin films with exceptional flexibility for wearable energy harvesting

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Carbon Energy 2024年第8期6卷 273-284页

作者： Zhuang‐Hao Zheng Yi‐Ming Zhong Yi‐Liu Li mohammad nisar Adil Mansoor Fu Li Shuo Chen Guang‐Xing Liang Ping Fan Dongyan Xu Meng Wei Yue‐Xing Chen Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina Department of Mechanical and Automation Engineering The Chinese University of Hong KongSha TinChina

Use of a flexible thermoelectric source is a feasible approach to realizing selfpowered wearable electronics and the Internet of *** thin films are promising candidates for fabricating flexible power supply,but obtaining highthermoelectric‐performance thin films remains a big *** the present work,a p‐type Bi_(x)Sb_(2−x)Te_(3)thin film is designed with a high figure of merit of 1.11 at 393 K and exceptional flexibility(less than 5%increase in resistance after 1000 cycles of bending at a radius of∼5 mm).The favorable comprehensive performance of the Bi_(x)Sb_(2−x)Te_(3)flexible thin film is due to its excellent crystallinity,optimized carrier concentration,and low elastic modulus,which have been verified by experiments and theoretical ***,a flexible device is fabricated using the prepared p‐type Bi_(x)Sb_(2−x)Te_(3)and n‐type Ag_(2)Se thin ***,an outstanding power density of∼1028μWcm^(−2)is achieved at a temperature difference of 25 *** work extends a novel concept to the fabrication of highperformance flexible thin films and devices for wearable energy harvesting.

关键词： Bi_(x)Sb_(2−x)Te_(3) electrical transport properties flexibility thermoelectric

Thermo-and pH-sensitive Polymer with Pendant Spacer-linked Imidazole Cycles

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Chinese Journal of Polymer Science 2024年第4期42卷 437-445页

作者： natalya V.Zakharova Stanislav n.Zelinskiy Mariya S.Strelova Elena n.Danilovtseva Vadim V.Annenkov Institute of Macromolecular Compounds of the Russian Academy of Sciences Saint Petersburg199004Russia Limnological Institute of Siberian Branch of the Russian Academy of Sciences Irkutsk664033Russia

By the reaction of poly(acryloyl chloride) with n-(3-aminopropyl)imidazole, poly(n-(3-(1H-imidazol-1-yl)propyl)acrylamide) was synthesized. The new polymer contains an imidazole ring removed from the main chain by a spacer of five bonds. The structure and purity, molecular weight, hydrodynamic and thermosensitive properties of the obtained sample were studied by1H-and13C-nMR, FTIR spectroscopy, acid-base titration, light scattering, turbidimetry and viscometry. The observed ability of the imidazole-containing polymer to form and destroy associates in water-salt solutions at pH 6.6-7.4 and temperatures of 29-48℃ indicates that these are promising candidates for designing complex biomedical systems. The new polymer is able to form complexes with oligo-DnA more actively than poly(1-vinylimidazole), which is of interest for gene delivery applications. The polymer cross-linked with epichlorohydrin gives micro-relief coatings on the plastic surface, and the modified surface is able to attach negatively charged objects. This thermo-and pH-sensitive polymer modification can be applied to create finely controlled surfaces for cell culturing.

关键词： Imidazole-containing polymer Thermolability pH-sensitivity The modified surface DnA immobilization

Commentary on“Desialylated Platelets Maintain Immune Quiescence through Regulating Kupffer Cells”

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Research 2024年第3期6卷 621-623页

作者： Chen Li Craig n.Morrell Aab Cardiovascular Research Institute University of Rochester School of Medicine and DentistryRochesterNYUSA Department of Pharmacology and Physiology University of Rochester School of Medicine and DentistryRochesterNYUSA Department of Medicine University of Rochester School of Medicine and DentistryRochesterNYUSA Department of Microbiology and Immunology University of Rochester School of Medicine and DentistryRochesterNYUSA Department of Pathology and Laboratory Medicine University of Rochester School of Medicine and DentistryRochesterNYUSA.

Platelets have long been studied for their roles in hemostasis and vascular injury repair. However, there is a continually evolving and deepening understanding that platelets initiate and regulate responses to tissue injury and pathogens, leading to platelets now being considered immune modulatory cells [1]. Platelets actively participate in host immune responses directly through pathogen engulfing and killing, or by regulating both innate and adaptive immune responses to infection or tissue injury [2]. Activated platelets promote inflammatory responses to tissue injury or infection by direct contact dependent interactions with immune cells and through indirect interactions via released soluble factors. However, mice that are deficient in platelets have skewed T helper cell differentiation [3] and increased vascular permeability [4], implying poorly defined roles for platelets in maintaining healthy immune homeostasis.

关键词： Platelet homeostasis Immune

Dispersion effect of nano-structure pyrolytic carbon on mechanical,electrical,and microstructural characteristics of cement mortar composite

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International Journal of Smart and nano Materials 2024年第3期15卷 534-578页

作者： n.K.Karthikeyan S.Elavenil School of Civil Engineering Vellore Institute of TechnologyChennaiIndia

In material science,converting waste into nanomaterials by green technologies highlights the interest in producing sus-tainable carbon nanomaterial(SCn).This study first-ever uti-lized tyre-char as a nano-Structure Pyrolytic Carbon(nSPC)to develop electrically conductive *** other car-bon nanomaterials,the efficiency of nSPC particle as an SCn in developing electrically conductive composites was investi-gated in terms of dispersion,mechanical,water absorption,electrical resistivity,and *** results of sedi-mentation and zeta potential(-19 mV)showed the excellent dispersion of nSPC particle in water with the combined effect of superplasticizer and *** compressive(40.37%)and flexural strength(10.76%)than that of plain cement mortar composite(CMC)is achieved with 2 wt.%and 1.5 wt.%of nSPC particle,*** water absorption rate and volume of permeable voids were reduced,exhibiting less *** percolation zone of AC and DC resis-tivity of nSPC composite ranges between 1 and 2 wt.%,and the established percolation threshold is at 2 wt.%.XRD analysis showed C-S-H formation consistently increased with curing age,and HR-SEM with EDAX analysis exhibits the dense micro-structure and well-distributed nSPC particle at the *** experimental outcomes significantly enhanced the relia-bility and provided a framework for tailoring nSPC particle as SCn for developing electrically conductive composite.

关键词： Sustainable nanomaterial dispersion mechanical properties electrical resistivity microstructure analysis

Implications of regional identity for neural stem and progenitor cell transplantation in the injured or diseased nervous system

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neural Regeneration Research 2024年第4期19卷 715-716页

作者： Prakruthi Amar Kumar Jennifer n.Dulin Department of Biology Texas A&M UniversityCollege Station Texas A&M Institute for neuroscience Texas A&M UniversityCollege Station

neural stem and progenitor cell(nSPC)transpla ntation has emerged as a promising therapeutic strategy for replacing lost neuronal populations and repairing damaged neural circuits following nervous system injury and disease.A great deal of experimental work has investigated the biology of nSPC grafting in preclinical animal models;more recently.

关键词： neural system injured