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Advances in engineered Bacillus subtilis biofilms and spores, and their applications in bioremediation, biocatalysis, and biomaterials

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Synthetic and Systems Biotechnology 2021年第3期6卷 180-191页

作者： Muhammad Zubair Mohsin Rabia Omer Jiaofang Huang Ali Mohsin Meijin Guo Jiangchao Qian Yingping Zhuang State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237PR China

Bacillus subtilis is a commonly used commercial specie with broad applications in the fields of bioengineering and biotechnology.B.subtilis is capable of producing both biofilms and spores.Biofilms are matrix-encased multicellular communities that comprise various components including exopolysaccharides,proteins,extracellular DNA,and poly-γ-glutamic acid.These biofilms resist environmental conditions such as oxidative stress and hence have applications in bioremediation technologies.Furthermore,biofilms and spores can be engineered through biotechnological techniques for environmentally-friendly and safe production of bio-products such as enzymes.The ability to withstand with harsh conditions and producing spores makes Bacillus a suitable candidate for surface display technology.In recent years,the spores of such specie are widely used as it is generally regarded as safe to use.Advances in synthetic biology have enabled the reprogramming of biofilms to improve their functions and enhance the production of value-added products.Globally,there is increased interest in the production of engineered biosensors,biocatalysts,and biomaterials.The elastic modulus and gel properties of B.subtilis biofilms have been utilized to develop living materials.This review outlines the formation of B.subtilis biofilms and spores.Biotechnological engineering processes and their increasing application in bioremediation and biocatalysis,as well as the future directions of B.subtilis biofilm engineering,are discussed.Furthermore,the ability of B.subtilis biofilms and spores to fabricate functional living materials with self-regenerating,self-regulating and environmentally responsive characteristics has been summarized.This review aims to resume advances in biological engineering of B.subtilis biofilms and spores and their applications.

关键词： Bacillus subtilis Biofilms spores Biocatalysis Bioremediation Biomaterials Synthetic biology

ALGAL, spores AND POLLEN ASSEMBLAGES FROM LATE PLEISTOCENE IN THE EAST PART OF THE CHINA SEA AND THEIR PALEOENVIRONMENTS

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Science China Chemistry 1989年第7期32卷 850-858页

作者：王开发张玉兰蒋辉 Department of Marine Geology Tongji University Shanghai

The paper deals with fossil spores, pollen and algae from the sediments of 70,00-12,000a B. P. in the eastern sea area of China, distinguishing three spores, pollen and algal zones. Zone Ⅰ indicates that the climate was cold, the sea level was lower, the continental shelf of theDonghai Sea (the East China Sea)was exposed as the plain with various grasses thickened and manylakes andswamps dotted in which lived abundant freshwater algae of Pediastrum, Zygnema, etc.The hills in the continental margin were covered by the dark coniferous forests of Abies, Piceaand Pinus. The climate of Zone Ⅱ was warm, resulting in the sea level rising and the con-tinental shelf submerged as neritic environment with a variety of diatoms, dinoflagllate andDictyocha. The vegetation of the hills in the continental margin became mixed forests ofconiferous and broad-leaf trees mainly composed of Pinus and Quercus. Zone Ⅲ indicatesthat the climate became cold again and the continental shelf was exposed as plain with thesame

关键词： algae spores pollen paleoenvironment

Fertile organs and in situ spores of a matoniaceous fern from the Lower Jurassic of West Hubei

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Chinese Science Bulletin 1999年第14期44卷 1333-1337页

作者： Yongdong Wang Shengwu Mei Acad Sinica Nanjing Inst Geol & Palaeontol Nanjing 210008 Peoples R China

Fossil matoniaceous plants represented by Phlebopteris have been formerly descrinbea and illustrated from the Mesozoic of China mainly based on vegetative leaves, and no information is provided on the fine structure of fertile organs. Recent reinvestigation of the Hsiangchi Flora from the Lower Jurassic of West Hubei, China, obtained a rich collection of well preserved Phlebopteris specimens (both sterile and fertile). Studies on Phlebopteris polypodioides Brongniart using LM and SEM reveal not only the structures of sori and sporangia, but also the details of in situ spores. Comparisons have been made between the in situ spores and other related fossil and extant matoniaceous spores, as well as the dispersed genera.

关键词： Phlebopteris Matoniaceae in situ spores Lower Jurassic Hubei.

Influence of Long Chain Free Fatty Acids on the Thermal Resistance Reduction of Bacterial spores

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Food and Nutrition Sciences 2013年第9期4卷 150-157页

作者： Brice Mvou Lekogo Louis Coroller Pierre Mafart Ivan Leguerinel Laboratoire Universitaire de Biodiversité et Ecologie Microbienne Université de Brest UEB Quimper France.

Aims: The objective of this study was to investigate the effect of free fatty acid length chain and unsaturated bond number on the heat resistance and recovery media of bacterial spores. Methods and results: For 6 species, bacterial spore heat resistances were estimated at different free fatty acid concentrations added to heating media or in recovery media. The addition of free fatty acids to heating media has a slight influence on the heat resistance of bacterial spores whatever the species or type of acid studied. On the contrary, the addition of free fatty acids to the recovery medium after the heat treatment greatly reduces the ability to bacterial spores to recover and form colonies. This effect varies depending on chain length, unsaturated bond number of fatty acid and on the bacterial strain studied. Conclusion: The presence of free acids in the recovery media is an additive stress which decreases the capability of injured spores to germinate and grow thereafter. Significance and impact of this study: The impact of free fatty acids presented in this study can be taken into account to reduce the thermal intensity of food sterilization in relation to their availability in food matrix.

关键词： Free Fatty Acid Bacterial spores Heat Resistance

LATE CARBONIFEROUS-EARLY PERMIAN spores AND POLLEN FROM NORTHWESTERN SHANXI, CHINA

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LATE CARBONIFEROUS-EARLY PERMIAN SPORES AND POLLEN FROM NORT...

Palynofloral changes in the Upper Paleozoic and Mesozoic of the Deocha-Pachami area, Birbhum Coalfield, West Bengal, India

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作者： Feng LIU Nanjing institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China.

The Carboniferous-Permian terrestrial strata cropping out in Baode, northwestern Shanxi have received much attention in the geological and palaeontological field for their continuous records in varied fossils and lithology as well as the study of the C\P boundary and palynology of China. Although some miospores were recorded and illustrated from the basal part of Benxi Formation to the upper part of Shihezi Formation by Kaiser (1976) and Tang (1994), a more detailed study of the palynological succession through the C-P sequence, and especially the determination of the C\P boundary still needs to be done. This poster presents the partial results of the palynological investigation carried out by the author on the Upper Carboniferous to the Lower Permian. Altogether 120 samples from the Benxi Formation to Taiyuan Formation have been

关键词： spores pollen biostratigraphy Lower Permian Upper Carboniferous Shanxi China

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Science China Earth Sciences 2009年第12期52卷 1932-1952页

作者： VIJAYA Birbal Sahni Institute of Palaeobotany 53 University Road Lucknow 226007 India

The study of Upper Paleozoic and Mesozoic palynomorphs in three boreholes from the Deocha-Pachami area, Birbhum Coalfield, West Bengal, India, has allowed dating of the Talchir, Barakar, Dubrajpur, and Rajmahal formations, and revealed many hiatuses. The lowermost unit, the Talchir Formation, yielded earliest Permian palynomorphs. The Barakar Formation, which includes coal-bearing strata, was previously dated as Early Permian. However, data presented herein indicate an Early Permian to earliest Triassic age for this unit,containing actually the Karharbari, Barakar s.s., Kulti, and Ranigang formations as well as the basal part of the Panchet Formation. The overlying Dubrajpur Formation is Jurassic (Callovian to Tithonian), with an unconformity at its base. The uppermost Dubrajpur Formation is Tithonian-Berriasian. The palynomorphs from the intertrappeans within the Rajmahal Formation suggest an Early Cretaceous age. The revised ages of the Barakar and Dubrajpur formations are of major regional significance. The distribution patterns of spore-pollen may provide a broad spectrum of paleoclimate during Permian, Late Jurassic, and Early Cretaceous times, as there is no record of marine signatures in the study area.

关键词： Talchir to Rajmahal formations Upper Paleozoic Mesozoic spores and pollen biostratigraphy India

A New Species of Coniopteris moguqiensis sp. nov. from the Middle Jurassic Wanbao Formation in Eastern Inner Mongolia, China

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Acta Geologica Sinica(English Edition) 2019年第5期93卷 1317-1324页

作者： ZHANG Yujin LIU Bingcai LIANG Fei Shenyang Center of Geological Survey China Geological SurveyShenyang 110034China College of Paleontology Shenyang Normal UniversityShenyang 110034China Key Lab of Evolution of Past Life in NE Asia Ministry of Natural ResourcesShenyang 110034China State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology CAS)Nanjing 210008China

In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new species of Coniopteris moguqiensis sp. nov. preserved as a fragment with fertile and sterile pinnules. The sterile ultimate pinnules are elongate ovate with sphenopteriod type venation, and fertile pinnules are usually isolated, bipinnate at least with the sorus apical, elliptical, 1 mm in diameter;sporangia are almost globular, 100-150 μm in diameter, and the annulus is vertical. In situ spores are rounded-triangular in polar view, 25-30 μm in diameter with sides straight and slightly convex;trilete, laesurae are thin and slightly straight;the exine surface is usually psilate under the light microscope but finely reticuloid sculptured on the proximal view under a scanning electronic microscope. The fern genus Coniopteris usually suggests a warm and humid environment, which is consistent with the palaeoclimatic conditions of petrified wood and megafossil plants. The new discovery further supplements the floral composition of the Wanbao Formation, providing new material for understanding the evolutionary trend and classification of Coniopteris.

关键词： Coniopteris Wanbao Formation in situ spores Middle Jurassic Inner Mongolia

Early Pliocene Paleoceanography of the Vityaz Fracture Zone,Central Indian Ridge

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Acta Geologica Sinica(English Edition) 2007年第4期81卷 614-621页

作者： M.V.S.GUPTHA Ranadip BANERJEE Lina P.MERGULHAO Priyanka BANERJEE G.PARTHIBAN Manish TEWARI National Institute of Oceanography Dona Paula Goa-403 004India Department of Geological Sciences Jadavpur University Kolkata700032India Physical Research Laboratory Navrangpura AhmedabadIndia

Planktic foraminifera from the calcareous substrate of a ferromanganese crust in the Vityaz Fracture Zone （VFZ）, Central Indian Ridge were studied to reconstruct the early Pliocene paleoceanography of this region. Eleven species of planktic foraminifera were encountered, among them Globorotalia menardii, Neogloboquadrina dutertrei, Globigerina bulloides and Globigerinoides tuber are prominent. Predominance of N. dutertrei in the top 3 cm of the carbonate substrate is attributed to an influx of fresh water which eventually triggered their productivity by increasing the nutrient level. The presence of G. bulloides and G. menardii in significant proportions in deeper layers suggests the prevalence of open ocean upwelling. The bulk chemical compositions of the substrate at different depth intervals indicates higher enrichment of trace metals in the upper sections which could have been supplied through oceanic water by the chemical weathering of terrestrial matter during the peak of Pliocene Asian monsoon. Thus, it is concluded that during the early Pliocene the biogenic components of the substrate were distinctly contributed by both upwelling and productivity triggered by an influx of fresh water originating from the intensification of the Asian monsoon during the early Pliocene Period.

关键词： Central Indian Ridge Vityaz Fracture Zone ferromanganese crust biogenic bloom,freshwater influx Neogene climate change spores Asian monsoon

A New Advancement of the Devonian-Carboniferous Boundary in Central Hunan Province, China

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Chinese Science Bulletin 1993年第23期38卷 1990-1994页

作者：方晓思 Ph.Steemans M.Streel Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 PRC Liege University Belgium

The Devonian-Carboniferous (D/C) boundary in China has been studied for a long time. The type section of the lower Carboniferous in China is situated between Wuliqiao and Heishiguan villages, south of Dushan County, G... 详细信息

关键词： spores the Devonian-Carboniferous boundary central Hunan.