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Osteocyte morphology and orientation in relation to strain in the jaw bone

International Journal of Oral Science 2018年第1期10卷 36-43页

作者： Vivian Wu René f. M. van Oers Engelbert A. J. M. Schulten Marco No Helder Rommel G. Bacabac Jenneke Klein-Nulend Department of Oral Cell Biology Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands Department of Dental Materials Science Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands Department of Oral and Maxillofacial Surgery VU University Medical Center/Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences Amsterdam The Netherlands Department of Physics Medical Biophysics Group University of San Carlos Cebu City Philippines

Bone mass is important for dental implant success and is regulated by mechanoresponsive osteocytes. We aimed to investigate the relationship between the levels and orientation of tensile strain and morphology and orientation of osteocytes at different dental implant positions in the maxillary bone. Bone biopsies were retrieved from eight patients who underwent maxillary sinus-floor elevation with β-tricalcium phosphate prior to implant placement. Gap versus free-ending locations were compared using 1) a three-dimensional finite-element model of the maxilla to predict the tensile strain magnitude and direction and 2) histology and histomorphometric analyses. The finite-element model predicted larger, differently directed tensile strains in the gap versus freeending locations. The mean percentage of mineralised residual native-tissue volume, osteocyte number(mean ± standard deviations:97 ± 40/region-of-interest), and osteocyte shape(90% elongated,10% round) were similar for both locations. However, the osteocyte surface area was 1.5-times larger in the gap than in the free-ending locations, and the elongated osteocytes in these locations were more cranially caudally oriented. In conclusion, significant differences in the osteocyte surface area and orientation seem to exist locally in the maxillary bone, which may be related to the tensile strain magnitude and orientation. This might reflect local differences in the osteocyte mechanosensitivity and bone quality, suggesting differences in dental implant success based on the location in the maxilla.

关键词： SINUS fLOOR ELEVATION MINERAL DENSITY MAXILLARY HISTOMORPHOMETRY TOMOGRAPHY IMPLANTS SPINE

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Biosurfactant-assisted phytoremediation of potentially toxic elements in soil:Green technology for meeting the United Nations Sustainable Development Goals

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Pedosphere 2022年第1期32卷 198-210页

作者： Songita SONOWAL Amy R.NAVA Sanket J.JOSHI Siddhartha Narayan BORAH Nazim f.ISLAM Soumya PANDIT Ram PRASAD Hemen SARMA Department of Botany School of Life SciencesMahatma Gandhi Central UniversityMotihari 845401India Department of Molecular&Cellular Physiology Stanford UniversityStanfordCA 94305SA Oil&Gas Research Center Central Analytical and Applied Research UnitSultan Qaboos UniversityMuscat 123Oman Centre for the Environment Indian Institute of Technology GuwahatiGuwahati 781039India Institutional Biotech Hub(IBT Hub) Department of BotanyNanda Nath Saikia CollegeTitabar 785630India Department of Life Sciences School of Basic Sciences and ResearchSharda UniversityGreater Noida 201306India

Biosurfactants are biomolecules produced by microorganisms, low in toxicity, biodegradable, and relatively easy to synthesize using renewable waste substrates. Biosurfactants are of great importance with a wide and versatile range of applications, including the bioremediation of contaminated sites. Plants may accumulate soil potentially toxic elements(PTEs), and the accumulation efficacy may be further enhanced by the biosurfactants produced by rhizospheric microorganisms. Occasionally, the growth of bacteria slows down in adverse conditions, such as highly contaminated soils with PTEs. In this context,the plant's phytoextraction capacity could be improved by the addition of metal-tolerant bacteria that produce biosurfactants. Several sources, categories,and bioavailability of PTEs in soil are reported in this article, with the focus on the cost-effective and sustainable soil remediation technologies, where biosurfactants are used as a remediation method. How rhizobacterial biosurfactants can improve PTE recovery capabilities of plants is discussed, and the molecular mechanisms in bacterial genomes that support the production of important biosurfactants are listed. The status and cost of commercial biosurfactant production in the international market are also presented.

关键词： bacterial genome metal-tolerant bacteria phytoextraction technology plant growth-promoting rhizobacteria rhizospheric microorganism

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Controlled Nanocutting of Graphene

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Nano Research 2008年第2期1卷 116-122页

作者： Lijie Ci Zhiping Xu Lili Wang Wei Gao feng Ding Kevin f.Kelly Boris I.Yakobson Pulickel M.Ajayan Department of Mechanical Engineering&Materials Science Rice UniversityHouston TX 77005USA Department of Electrical and Computer Engineering Rice UniversityHouston TX 77005USA

Rapid progress in graphene-based applications is calling for new processing techniques for creating graphene components with different shapes,sizes,and edge *** we report a controlled cutting process for graphene sheets,using nickel nanoparticles as a knife that cuts with nanoscale *** cutting proceeds via catalytic hydrogenation of the graphene lattice,and can generate graphene pieces with specifi c zigzag or armchair *** size of the nanoparticle dictates the edge structure that is produced during the *** cutting occurs along straight lines and along symmetry lines,defined by angles of 60ºor 120º,and is defl ected at free edges or defects,allowing practical control of graphene nano-engineering.

关键词： Graphene nano-engineering electronics catalytic hydrogenation

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生态经济学——解决环境问题的新尝试

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国外社会科学 1998年第3期 87-88页

作者：Ｆ．泽尔纳

生态经济学——解决环境问题的新尝试〔德〕Ｆ．泽尔纳鉴于物种灭绝、雨林破坏、臭氧洞和温室效应等全球性和长期性的环境问题，新古典环境经济学日益受到批评，人们提出了解决环境问题的新理论——生态经济学。１．新古典环境经济学新... 详细信息

生态经济学——解决环境问题的新尝试〔德〕Ｆ．泽尔纳鉴于物种灭绝、雨林破坏、臭氧洞和温室效应等全球性和长期性的环境问题，新古典环境经济学日益受到批评，人们提出了解决环境问题的新理论——生态经济学。１．新古典环境经济学新古典环境经济学特别把新古典经济学中...

关键词：生态经济学新尝试泽尔纳新古典经济学环境经济学

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Cementless Semi-Constrained Rotating Platform Total Knee Replacement: A Concise follow-Up of a Previous Report at a Minimum of Twenty Years

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Open Journal of Orthopedics 2023年第3期13卷 71-77页

作者： frederick f. Buechel Sr. frederick f. Buechel Jr. Thomas E. Helbig Rutgers NJ Medical School Newark USA South Mountain Orthopaedic Associates South Orange USA Lenox Hill Hospital New York USA

Background: A previous report evaluated the initial 310 cementless, Buechel-Pappas (B-P), Semi-Constrained Rotating Platform total knee replacements in 257 patients followed for an average of 7.6 years, range 2 - 18 years. Diagnoses were osteoarthritis in 233 patients, post traumatic arthritis in 4 patients and rheumatoid arthritis in 22 patients. Knee Scores, using a strict knee scoring scale were 86.4% excellent, 12.3% good, 0.3% fair and 1.0% poor results. Survivorship, using an end point of revision for any mechanical reason (including component loosening, bearing wear and bearing dislocation) was 99.4%. Survivorship for a poor knee score (including persistent pain, loosening, instability and infection was 97.6%. The purpose of the present study is to report the updated results of this same patient cohort at a minimum follow-up of twenty years. Methods: The average age of patients at the time of surgery was 67 years, range 34 to 91 years. A total of 20 patients (22 knees) were still living, with a follow-up of 20 - 30 years (mean 23.47 years). The same strict knee scoring scale and survivorship analysis were used to evaluate patient outcomes at the 20 to 30 years interval. Results: Survivorship, in the current study, using the same end points as in the previous study, was 96.5% at the 20 and 30-year intervals. Late mechanical failure and osteolysis were not identified. Conclusion: This cementless, semi-constrained rotating platform total knee replacement has stood the test of time for more than 20 years and can be considered acceptable for long-term use, in properly selected patients.

关键词： Knee Replacement Cementless Semi-Constrained Rotating

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ConservativeapproachinPeutz-JeghersSyndrome:Single-balloon enteroscopyandsmallbowelpolypectomy

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World Journal of Gastrointestinal Endoscopy 2014年第7期6卷 318-323页

作者： Torroni f Romeo E Rea f De Angelis P foschia f faraci S federici di Abriola G Contini AC Caldaro T Dall’Oglio L filippo Torroni Erminia Romeo Francesca Rea Paola De Angelis Francesca Foschia Simona Faraci Giovanni Federici di Abriola Anna Chiara Contini Tamara Caldaro Luigi Dall’Oglio Department of Surgery and Transplantation Digestive Surgery and Endoscopy Unit Bambino Gesù Children’s Hospital IRCCS 00165 Rome Italy

AIM: To assess the usefulness of the balloon assisted enteroscopy in preventing surgical intervention in pa-tients with Peutz-Jeghers syndrome (PJS) having a small bowel large polyps. METHODS: Seven consecutive asymptomatic pts(age 15-38 years) with PJS have been collected; six under-went polypectomy using single balloon enteroscopy(Olympus SIf Q180) with antegrade approach using push and pull technique. SBE system consists of the SIf-Q180 enteroscope, an overtube balloon control unit(OBCU Olympus Balloon Control Unit) and a dispos-able silicone splinting tube with balloon(ST-SB1). All procedures were performed under general anesthesia. Previously all pts received wireless capsule endos-copy(WCE). Prophylactic polypectomy was reservedmainly in pts who had polyps > 15 mm in diameter. The balloon is inflated and deflated by a balloon control unit with a safety pressure setting range from-6.0 kPa to +5.4 kPa. Informed consent has been obtained from pts or parents for each ***: Six pts underwent polypectomy of small bowel polyps; in 5 pts a large polyp > 15 mm(range 20-50 mm in diameter) was resected; in 1 patient with WCE negative, SBE was performed for previous surgi-cal resection of gastrointestinal stromal tumors. In 2 pts endoscopic clips were placed due to a polypectomy. No surgical complication have been reported. SBE with resection of small bowel large polyps in PJS pts was useful to avoid gastrointestinal bleeding and emergency laparotomy due to intestinal intussuscep-tions. No gastrointestinal tumors were found in sub-sequent enteroscopic surveillance in all seven pts. In order surveillance, all pts received WCE, upper en-doscopy, ileocolonoscopy every 2 years. No pts had extraintestinal malignant lesions. SBE was performed when WCE was positive for significant polyps(> 15 mm).CONCLUSION: The effective of prophylactic polyp-ectomy of small bowel large polyps(> 15 mm) could be the first line treatment for conservative approach in management of PJS

关键词： Peutz-Jeghers syndrome Balloon assisted enteroscopy Polypectomy

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Influence of the starter culture on the volatile profile of processed cocoa beans by gas chromatography–mass spectrometry in high resolution mode

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food Bioscience 2022年第3期47卷 595-603页

作者： K.G.Alvarez-Villagomez C.A.Ledesma-Escobar f.Priego-Capote V.J.Robles-Olvera P.García-Alamilla Unidad de Investigación y Desarrollo en Alimentos TecNM/Instituto Tecnológico de VeracruzMiguel Ángel de Quevedo 2779VeracruzVer.Mexico Academic Division of Agriculture and Livestock Science Universidad Juárez Autónoma de TabascoCarreteraVillahermosa-Teapa Km 25La HuastecaCentroTabasco86280Mexico Department of Analytical Chemistry Campus of RabanalesUniversity of CordobaSpain Maimonides Institute of Biomedical Research (IMIBIC) Reina Sofia University HospitalSpain Consortium for Biomedical Research in frailty & Healthy Ageing CIBERFESCarlos III Institute of HealthSpain

Cocoa is the main component of *** is widely accepted that cocoa quality largely depends on the processing,especially the fermentation ***,fermentation takes place spontaneously by the endogenous microbiota;however,the process can lead to poor quality and heterogeneity of the final *** this study,we evaluated the influence of the starter culture on the profile of volatiles during fermentation of commercial volumes of Mexican *** were also analyzed in post-fermented cocoa samples obtained after drying,roasting,and *** results revealed a most desirable volatile profile in cocoa fermented with starter culture,mainly due to the higher relative content of alcohols(40%)and aldehydes(3.5%),but also due to a lower acidity(fermentation(acids,65%;alcohols,2%;and aldehydesf pyrazines in the inoculated samples after processing.

关键词： Cocoa beans Starter culture Cocoa fermentation Postfermentation Volatile compounds Mass spectrometry

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风暴之后的风平浪静:智利的收入分配与社会福利

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国外社会科学 2001年第1期 108-109页

作者： f.H.G.费雷拉

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后现代的科学技术

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国外社会科学 1993年第4期 66-70页

作者： f.费雷陈平

我们用“技术”这个词表示智力的有效实施。用这种方法进行广义的理解,技术在近代才出现的科学之前,已经长期扮演着极其重要的角色了。技术而不是科学,直接与生命和自然界紧密相关。这是人类文化的主要现象。任何文化都有它特有的技术... 详细信息

我们用“技术”这个词表示智力的有效实施。用这种方法进行广义的理解,技术在近代才出现的科学之前,已经长期扮演着极其重要的角色了。技术而不是科学,直接与生命和自然界紧密相关。这是人类文化的主要现象。任何文化都有它特有的技术。当然,受现代科学的影响,主要在近两个世纪中,欧洲技术发生了根本的变化。这些新技术进而在很大程度上改变了现代科学文明。现在我们看到了出现后现代科学的诱

关键词：前现代后现代

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保德河盆地莫里页岩的固态核磁共振特征

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地质地球化学 1995年第3期23卷 29-33页

作者： f.P.Miknis 吴元江苏油田地科院

对怀俄明州保德河盆地莫里页岩的一组生油岩样品进行了固态13C核磁共振（NMR）测量。这项研究的目的是几CP／MAS13CNMR测量来监测由埋深引起的干酪根碳结构的变化。NMR测量样品的现今埋深为3000～11500英尺1）。由于总有机碳含量主要为... 详细信息

对怀俄明州保德河盆地莫里页岩的一组生油岩样品进行了固态13C核磁共振（NMR）测量。这项研究的目的是几CP／MAS13CNMR测量来监测由埋深引起的干酪根碳结构的变化。NMR测量样品的现今埋深为3000～11500英尺1）。由于总有机碳含量主要为（1～2）Wt％，在13CNMR测量中使用了大容量的样品旋转器。用HCI清洗样品能提高13C谱图的质量。干酪根的芳香度随理深的增加而增加，在深度超过10000英尺时，由于干酪根中残留的脂肪族碳很少，几乎不能再生油。结合NMR和生油岩评价数据，得到了氢聚散的估算结果。计算表明，约有20％的干酪根转化为烃类，由于芳构化和缩合反应，释放出足够的氢，而使产物稳定下来。

关键词：页岩岩样固态核磁共振

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