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CRACK HEALING UTILISING BACTERIAL SPORES IN CONCRETE

Journal of Green Building 2017年第3期12卷 103-114页

作者： Alan Richardson Leon Amess simon neville Christopher Walton Northumbria University 510 Wynne JonesNew Castle upon TyneNE18SA United Kingdom

This self repair system is based upon harmless ground borne bacteria as the self-healing *** bacteria are activated after the concrete is cracked and the bacterial spores are exposed to moisture and *** bacterial reproduction process creates a calcite by-product which fills the cracks in the *** sealing the cracks in concrete,an effective barrier to air or liquid borne deleterious materials are formed and as a consequence of this,enhanced durability is achieved in the structure,result-ing in lower life cycle *** concrete/mortar prisms were cracked and tested for water *** were then left for 56 days to heal and were subject to a test for water *** was observed and a reduced water flow(74%and 32%healed)measured with the healed samples when compared to the specimens that were cracked and subjected to a water flow test without any healing *** number of samples were limited and a larger scale test is recommended for further work;however,this is a proof of concept of the process of healing and testing.

关键词： self-healing bio-based mortar micro-cracking light weight aggregates liquid-tightness

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Dental anomalies in first-degree relatives of transposed canine probands

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International Journal of Oral Science 2015年第3期7卷 169-173页

作者： Adriana Bartolo neville Calleja Fraser McDonald simon Camilleri Broadstreet Dental Centre Department of Public Health Medical School University of Malta Dental Institute Department of Orthodontics Kings College London

The aim of this study was to investigate and compare the inheritance pattern and prevalence of inheritable dental anomalies in a sample of patients with maxillary canine—first premolar transposition and their first-degree relatives with a sample of palatally displaced canine families. Thirty-five consecutive maxillary canine—first premolar transposition probands and 111 first-degree relatives were matched to 35 consecutive palatally displaced canine probands and 115 first-degree relatives. These were assessed for palatally displaced canines and incisor-premolar hypodontia. Parental age at birth of the proband was also noted. The results revealed that（i） there is no difference in the overall prevalence of palatally displaced canine or incisor-premolar hypodontia between the groups of relatives;（ii） first-degree relatives of bilateral palatally displaced canine probands have a higher prevalence of palatally displaced canine and incisor-premolar hypodontia than those with unilateral palatally displaced canine; and（iii） maternal age at birth of the maxillary canine—first premolar transposition probands was significantly higher than that of the palatally displaced canine *** results suggest that maxillary canine—first premolar transposition and palatally displaced canine are unlikely to be different genetic entities and also indicate environmental or epigenetic influences on dental development.

关键词： ectopic epigenomics genetics hypodontia orthodontics tooth eruption

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The potential of trehalose to replace insect hemolymph in artificial media for Trichogramma dendrolimi （Hymenoptera： Trichogrammatidae）

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Insect Science 2013年第5期20卷 629-636页

作者： Xin Lu Shi-Chou Han Li-Ying Li simon Grenier Patrick De Clercq Guangdong Entomological Institute Guangzhou China UMR BF21 INRAIINSA Lyon France Department of Crop Protection Faculty of Bioscience Engineering Ghent University Ghent Belgium

Insect additives have been shown to improve the value of artificial media for Trichogramma species, but at the same time maintain dependence on parallel cultures of host insects. In the present study, Trichogramma dendrolimi Matsumura was reared in vitro from egg to adult on artificial media with different contents of pupal hemolymph of Chinese oak silkmoth Antheraea pernyi （Guérin-Méneville） and with supplements of distilled water, or of trehalose dissolved in water or in Grace＇s insect medium. The results indicated insect hemolymph was the key component of artificial medium. Developmental parameters, including rates of parasitism, pupation, adult emergence and normal adults, and numbers of produced adults, were increased on media supplemented with trehalose even when the proportion of pupal hemolymph was reduced. Two artificial media, the first containing 30% hemolymph and 10% trehalose in water with 98.9% parasitism rate, 77.7.0% pupation rate, 77.2% emergence rate, 80.0% normal adult rate and 333 produced adults, and the second containing 25% hemolymph and 15% trehalose in Grace＇s insect medium with 97.8% parasitism rate, 91.0% pupation rate, 85.2% emergence rate, 76.1% normal adult rate and 757 produced adults, were believed to hold potential to mass produce T. dendrolimi. The use of trehalose to partially replace pupal hemolymph in artificial medium of this and other Trichogramma species may contribute to a significant reduction in their production cost and may as such help to evade problems related to short supplies of lepidopteran eggs, which currently constitute the main factitious host for the mass rearing of the parasitoids.

关键词： artificial medium in vitro rearing trehalose Trichogramma dendrolimi

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