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Artykuły w czasopismach na temat „Bacterial studies”

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Data publikacji: 6 września 2023

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1

Chandiok, S., P. G. Fisk i V. C. Riley. "Prostatitis—Clinical and Bacterial Studies". International Journal of STD & AIDS 3, nr 3 (maj 1992): 188–90. http://dx.doi.org/10.1177/095646249200300306.

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Forty men with clinical prostatitis were studied to determine the value of symptomatology and categorization and 30 (75%) were classified as having prostatitis on the basis of prostatic localization studies. Of these 3 (10%) had chronic bacterial prostatitis, 18 (60%) had chronic abacterial prostatitis, and 9 (30%) had prostatodynia. No patient had acute bacterial prostatitis. Although Enterobacteriaciae were isolated from the 3 men with chronic bacterial prostatitis, these bacteria along with Staphlococcus aureus, Streptococcus faecalis, and Chlamydia trachomatis were isolated from a further 6 patients. The mean pH of the expressed prostatic secretion was measured for each group and was found to be 7.6 for those with chronic bacterial prostatitis, 7.1 for chronic abacterial prostatitis, 6.5 for prostatodynia, and 6.9 for those with urethritis suggesting that this test may be of value in the diagnosis of chronic bacterial prostatitis.

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2

Tamilarasan, G., M. Arumugam Pillai i R. Kannan S. Merina Prem Kumari. "Genetic Diversity Studies in Rice for Bacterial Leaf Blight Resistance". International Journal of Trend in Scientific Research and Development Volume-2, Issue-5 (31.08.2018): 797–806. http://dx.doi.org/10.31142/ijtsrd15915.

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Agrawal, Payal, i Nikhilesh Kulkarni. "Studies on Bacterial Synthesis of Silver Nanoparticles and its Synergistic Antibacterial effect with antibiotics against Selected MDR Enteric Bacteria". International Journal of Life-Sciences Scientific Research 4, nr 4 (lipiec 2018): 1897–904. http://dx.doi.org/10.21276/ijlssr.2018.4.4.7.

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4

Tsuru, D., T. Yoshimoto, H. Yoshida, H. Kira i J. Fukumoto. "STUDIES ON BACTERIAL PROTEASES". International Journal of Protein Research 2, nr 1-4 (9.01.2009): 75–81. http://dx.doi.org/10.1111/j.1399-3011.1970.tb01662.x.

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Tsuru, D., T. Yoshida, T. Hirose, T. Yoshimoto i J. Fukumoto. "STUDIES ON BACTERIAL PROTEASES". International Journal of Protein Research 2, nr 1-4 (9.01.2009): 257–64. http://dx.doi.org/10.1111/j.1399-3011.1970.tb01683.x.

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Yoshimoto, Tadashi, Juichiro Fukumoto i Daisuke Tsimut. "STUDIES ON BACTERIAL PROTEASES". International Journal of Protein Research 3, nr 1-4 (9.01.2009): 285–95. http://dx.doi.org/10.1111/j.1399-3011.1971.tb01722.x.

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Servais, P., G. Billen, P. Laurent, Y. Levi i G. Randon. "Studies of BDOC and bacterial dynamics in the drinking water distribution system of the Northern Parisian suburbs". Revue des sciences de l'eau 5 (12.04.2005): 69–89. http://dx.doi.org/10.7202/705154ar.

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The deterioration of water quality in distribution systems due to bacterial regrowth is, at the present time, a major concern of drinking water producers. In this context, a good knowledge of the factors controlling bacterial development is required; the aim of the present study is to understand the rote of biodegradable dissolved organic carbon (BDOC) in the bacterial dynamics of the distribution system. This paper discusses the results obtained in a study carried out in order to assess the dynamics of biodegradable dissolved organic carbon and suspended bacteria in the water distribution system of the Northern Parisian suburbs lad by the Méry-sur-Oise treatment plant. The results show clearly that a significant decrease in BDOC occurs within the smallest pipes, when the BDOC level in the finished water is higher than about 0.20 mgC.L-1. However, no decrease in BDOC is observed when the BDOC in the finished water is lower than 0.16 mgC.L-1. The bacterial abundance in the distribution system is primarily linked to the absence of free chicane. Temperature and BDOC concentration in the finished water are also major controlling factors of bacterial numbers. Bacterial growth rates are in the range 0.005 to 0.1 h-1 in the absence of free chlorine, the highest of these values are in the same range as the growth rates measured for bacteria in natural aquatic ecosystems. Fixed biomass to the inner pipes surface are in the range 0.25 to 0.65 µgC.cm-2 and the average growth rate of fixed bacteria seems to be roughly in the same order of magnitude as the average growth rate of the suspended bacteria. A model of the dynamics of BDOC and bacteria in distribution network, incorporating the knowledge gained from this and previous studies concerning the control of bacterial activity by dissolved organic matter, is presented. It involves a mathematical representation of the kinetics of bacterial adsorption-desorption processes, bacterial attachment, bacterial utilization of biodegradable dissolved organic matter and impact of chlorine on free and fixed bacteria. It allows simulation of the impact of reducing the BDOC in the finished water on processes associated with bacterial regrowth in the distribution network..

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Mularski, Anna, i Frances Separovic. "Atomic Force Microscopy Studies of the Interaction of Antimicrobial Peptides with Bacterial Cells". Australian Journal of Chemistry 70, nr 2 (2017): 130. http://dx.doi.org/10.1071/ch16425.

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Antimicrobial peptides (AMPs) are promising therapeutic alternatives to conventional antibiotics. Many AMPs are membrane-active but their mode of action in killing bacteria or in inhibiting their growth remains elusive. Recent studies indicate the mechanism of action depends on peptide structure and lipid components of the bacterial cell membrane. Owing to the complexity of working with living cells, most of these studies have been conducted with synthetic membrane systems, which neglect the possible role of bacterial surface structures in these interactions. In recent years, atomic force microscopy has been utilized to study a diverse range of biological systems under non-destructive, physiologically relevant conditions that yield in situ biophysical measurements of living cells. This approach has been applied to the study of AMP interaction with bacterial cells, generating data that describe how the peptides modulate various biophysical behaviours of individual bacteria, including the turgor pressure, cell wall elasticity, bacterial capsule thickness, and organization of bacterial adhesins.

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9

Yaghoubi, Atieh, Majid Khazaei, Seyed Mahdi Hasanian, Amir Avan, William C. Cho i Saman Soleimanpour. "Bacteriotherapy in Breast Cancer". International Journal of Molecular Sciences 20, nr 23 (23.11.2019): 5880. http://dx.doi.org/10.3390/ijms20235880.

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Breast cancer is the second most common cause of cancer-related mortality among women around the world. Conventional treatments in the fight against breast cancer, such as chemotherapy, are being challenged regarding their effectiveness. Thus, strategies for the treatment of breast cancer need to be continuously refined to achieve a better patient outcome. We know that a number of bacteria are pathogenic and some are even associated with tumor development, however, recent studies have demonstrated interesting results suggesting some bacteria may have potential for cancer therapy. Therefore, the therapeutic role of bacteria has aroused attention in medical and pharmaceutical studies. Furthermore, genetic engineering has been used in bacterial therapy and may led to greater efficacy with few side effects. Some genetically modified non-pathogenic bacterial species are more successful due to their selectivity for cancer cells but with low toxicity for normal cells. Some live, attenuated, or genetically modified bacterias are capable to multiply in tumors and inhibit their growth. This article aims to review the role of bacteria and their products including bacterial peptides, bacteriocins, and toxins for the treatment of breast cancer.

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10

Ebenfelt, Anders. "Bacterial Location in Chronic Sinusitis". American Journal of Rhinology 19, nr 5 (wrzesień 2005): 458–61. http://dx.doi.org/10.1177/194589240501900507.

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Background In chronic nonallergic sinusitis, it is often assumed that bacteria invade the sinus mucosa where the inflammatory condition begins and is maintained. However, the bacterial presence in a normal or moderately damaged epithelial layer has never been proved in biopsy studies. Methods In this study, mucosal samples from six consecutive patients with chronic sinusitis were examined. Transmission electron microscopy was used and the presence of bacterial invasion and formation of phagosomes containing bacteria as a marker of host response were studied. Results Phagocytosis of bacteria was observed in the sinus mucosa in samples from only one patient. In the other five patients, no signs of phagocytosis were seen. Conclusion Based on these results, we concluded that in chronic sinusitis, bacterial invasion in sinus mucosa is not an obligatory phenomenon.

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Henrighsen, JØrgen, Leif Oddvar Frøholm i Kjell Bøvre. "Studies on Bacterial Surface Translocation". Acta Pathologica Microbiologica Scandinavica Section B Microbiology and Immunology 80B, nr 3 (15.08.2009): 445–52. http://dx.doi.org/10.1111/j.1699-0463.1972.tb00059.x.

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SLACK, RICHARD. "Bacterial Kinetic studies in infection". Journal of Antimicrobial Chemotherapy 15, nr 5 (1985): 519–21. http://dx.doi.org/10.1093/jac/15.5.519.

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13

Strobin, Grazyna, Andrzej Wlochowicz, Danuta Ciechanska, Stefan Boryniec, Henryk Struszczyk i Serafina Sobczak. "GPC STUDIES ON BACTERIAL CELLULOSE". International Journal of Polymeric Materials 53, nr 10 (październik 2004): 889–900. http://dx.doi.org/10.1080/009114030490502418.

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14

Enger, Erik, i Sten Jacobsen. "Studies in Subacute Bacterial Endocarditis". Acta Medica Scandinavica 169, nr 2 (24.04.2009): 227–36. http://dx.doi.org/10.1111/j.0954-6820.1961.tb07827.x.

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15

de Groot, Natalia S., Alba Espargaró, Montserrat Morell i Salvador Ventura. "Studies on bacterial inclusion bodies". Future Microbiology 3, nr 4 (sierpień 2008): 423–35. http://dx.doi.org/10.2217/17460913.3.4.423.

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MIZUSHIMA, Shoji. "Studies on bacterial cell surfaces." Journal of the agricultural chemical society of Japan 63, nr 1 (1989): 1–8. http://dx.doi.org/10.1271/nogeikagaku1924.63.1.

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Fiedler, Tristan J., i Arun Malhotra. "Crystallographic Studies of Bacterial Exoribonucleases". Scientific World JOURNAL 2 (2002): 53–54. http://dx.doi.org/10.1100/tsw.2002.27.

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Marsden, M., C. I. Bruce, C. G. Bartram i P. J. Buttery. "Initial studies on leucine metabolism in the rumen of sheep". British Journal of Nutrition 60, nr 1 (lipiec 1988): 161–71. http://dx.doi.org/10.1079/bjn19880085.

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1. [3H]leucine infused directly into the rumen of sheep labelled microbial protein and, when compared with the specific activity of the rumen free-leucine pool, indicated that 50% of the bacterial protein leucine originated from the rumen free-leucine pool.2. The lower limit for bacterial protein turnover in the rumen was 0.37/d when calculated as the difference between the specific rate of disappearances of labelled bacteria from the rumen and the liquid-phase dilution rate.3. Intravenously infused leucine also labelled the rumen bacteria. The build-up of specific activity in the rumen bacteria was sigmoidal and did not resemble that of the salivary protein which suggested that the rumen epithelium was a major endogenous protein input to the rumen. Additionally, bacteria isolated from the rumen epithelium had high radioactivity indicating that they were ingesting the rumen epithelial cells.

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19

Kusek, Edward R. "Immediate Implant Placement Into Infected Sites: Bacterial Studies of the Hydroacoustic Effects of the YSGG Laser". Journal of Oral Implantology 37, sp1 (1.04.2011): 205–11. http://dx.doi.org/10.1563/aaid-joi-d-10-00014.

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This article describes the use of an erbium laser to use photoacoustics to reduce the bacteria in osteotomy sites that were infected by apical pathology. The author shows reduced bacterial counts by performing bacterial cultures following laser treatment. Swabs were taken after the extraction of the tooth and then after the laser was placed into the osteotomy site. The results showed a noticeable reduction of bacteria and no traces of virulent bacteria.

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20

Cormac G.M. Gahan. "The Bacterial lux Reporter System: Applications in Bacterial Localisation Studies". Current Gene Therapy 12, nr 1 (3.04.2012): 12–19. http://dx.doi.org/10.2174/156652312799789244.

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Castro, Bruno G. de, Miliane M. S. de Souza i Avelino J. Bittencourt. "Aerobic bacterial microbiota in stomoxys calcitrans: preliminary studies in Brazil". Revista Brasileira de Parasitologia Veterinária 16, nr 4 (grudzień 2007): 193–97. http://dx.doi.org/10.1590/s1984-29612007000400003.

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The stable fly, Stomoxys calcitrans, has a great importance in medical and veterinary health due to its feeding and reproductive habits, which can disseminate some pathogenic agents among hosts even at long distances. This study aimed to describe, for the first time in Brazil, the bacterial microbiota in segments of the stable fly. Bacterial species were isolated from three different segments (cuticle, mouth parts and abdominal alimentary tract) of the stable fly. Twenty dairy farms were visited in four municipalities: Barra Mansa, Quatis, Resende and Rio Claro in the State of Rio de Janeiro in order to collect 20 flies in each site. Dissection of the flies and procedures of isolation and identification of bacterial species were performed. A total of 161 colonies of 33 distinct species were isolated, such as Escherichia coli, Staphylococcus aureus, and S. intermedius. Stomoxys calcitrans may harbor bacterial agents on their cuticle, mouth parts and abdominal alimentary tract and these bacteria may be pathogenic to their hosts.

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22

Scheffers, Dirk-Jan, i Mariana G. Pinho. "Bacterial Cell Wall Synthesis: New Insights from Localization Studies". Microbiology and Molecular Biology Reviews 69, nr 4 (grudzień 2005): 585–607. http://dx.doi.org/10.1128/mmbr.69.4.585-607.2005.

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SUMMARY In order to maintain shape and withstand intracellular pressure, most bacteria are surrounded by a cell wall that consists mainly of the cross-linked polymer peptidoglycan (PG). The importance of PG for the maintenance of bacterial cell shape is underscored by the fact that, for various bacteria, several mutations affecting PG synthesis are associated with cell shape defects. In recent years, the application of fluorescence microscopy to the field of PG synthesis has led to an enormous increase in data on the relationship between cell wall synthesis and bacterial cell shape. First, a novel staining method enabled the visualization of PG precursor incorporation in live cells. Second, penicillin-binding proteins (PBPs), which mediate the final stages of PG synthesis, have been localized in various model organisms by means of immunofluorescence microscopy or green fluorescent protein fusions. In this review, we integrate the knowledge on the last stages of PG synthesis obtained in previous studies with the new data available on localization of PG synthesis and PBPs, in both rod-shaped and coccoid cells. We discuss a model in which, at least for a subset of PBPs, the presence of substrate is a major factor in determining PBP localization.

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23

Galkiewicz, Julia P., i Christina A. Kellogg. "Cross-Kingdom Amplification Using Bacteria-Specific Primers: Complications for Studies of Coral Microbial Ecology". Applied and Environmental Microbiology 74, nr 24 (17.10.2008): 7828–31. http://dx.doi.org/10.1128/aem.01303-08.

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ABSTRACT PCR amplification of pure bacterial DNA is vital to the study of bacterial interactions with corals. Commonly used Bacteria-specific primers 8F and 27F paired with the universal primer 1492R amplify both eukaryotic and prokaryotic rRNA genes. An alternative primer set, 63F/1542R, is suggested to resolve this problem.

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Carr, Geneviève M., i Antoine Morin. "Sampling variability and the design of bacterial abundance and production studies in aquatic environments". Canadian Journal of Fisheries and Aquatic Sciences 59, nr 6 (1.06.2002): 930–37. http://dx.doi.org/10.1139/f02-072.

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Published data for aquatic bacterial abundance and production in benthic and planktonic environments were collected from the literature to describe relationships between sample means and variances, to explore the factors that affect these relationships, and to estimate the number of samples needed to detect specified differences among means with adequate power. Between 75 and 94% of sample log10(variance) was explained by log10(mean) for both bacterial abundance and production. Differences in mean-variance relationships of bacterial abundance and production due to habitat (river, lake, marine), quantification method, and experimental manipulation (planktonic bacteria) or substrate type (benthic bacteria) were negligible (less than 11% of residual variance from regressions explained). Between 12 and 69 replicates are necessary to detect a 20% difference in means for bacterial abundance and production with a power of 80%. Given the median rate of replication of 3 to 4, the majority of published studies reviewed here are, at best, able to detect differences in means of 50% (planktonic bacterial abundance) or 100% (planktonic production and benthic abundance and production) with 80% power. If effect sizes less than these values are deemed biologically meaningful, then future studies will have to increase sampling effort to enable detection of such differences.

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Dantani Dauda Odonye, Odonye Enoch Peter, Abisabo Adamu, Fauzeeyah Aminu Kazeem, Okposhi Usman Shuaibu i Tsaku Mary Isaac. "Studies on soil nitrogen in relation to bacterial microflora in soil samples from agricultural farmland in Naraguta, Plateau State". International Journal of Scientific Research Updates 1, nr 1 (30.06.2021): 011–15. http://dx.doi.org/10.53430/ijsru.2021.1.1.0013.

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A study was conducted to determine the relationship between soil bacterial microfloral and organic Nitrogen content including soil pH. Two study agricultural farmlands were chosen. Ten soil samples were collected from each of the two agricultural farmlands and analysed quantitatively for total bacteria and soil nitrogen content. Total bacteria count was determined using the standard plate count while soil nitrogen content was determined using Kjeldahl method. Bacterial count ranged from 3.5 x 106 to 10.0 x 106 cfu/g in site -1 while in site -2, the bacterial counts ranges from 4.5 x 106 to 13.0 x 106 cfu/g. The corresponding soil nitrogen for site 1 and 2 was 0.30 - 0.50 mgkg-1 and 0.50 - 0.71 mgkg-1 respectively. Bacterial count was found to be directly proportional to soil nitrogen. The dominant bacteria identified in order of significance were; Bacillus spp (23.0%) >Klebsiella spp (21.3%) >Pseudomonas spp (16.3%) >Azotobacter spp. (13.3%) > S. aureus (11.3%) >E. coli (7.5%) >Streptococcus spp (6.6%). The pH for both sites ranged between 6.0-7.6. Correlation analysis was determined between the soil bacterial load and organic nitrogen. There was positive correlation between soil nitrogen and the corresponding bacterial load even though it was not statistically significant (P>0.05). It can be concluded that there is a relationship between soil bacterial micro flora and nitrogen content and this can be used as an index of soil health and fertility.

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Marquez, Audrey de Souza, Tania Aguiar Passeti, Susana Nogueira Diniz i Everton Tadeu Prado. "Homeopathic medicine activity on the growth of Gram-negative bacteria". International Journal of High Dilution Research - ISSN 1982-6206 21, nr 1 (6.05.2022): 17. http://dx.doi.org/10.51910/ijhdr.v21i1.1178.

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Introduction: Homeopathy is a therapy that uses medications prepared with infinitesimal and dynamized dilutions. Current studies demonstrate in vitro activity of homeopathy on gram-positive bacteria such as Staphylococcus aureus and Streptococcus pyogenes. Among bacterial infections, urinary tract infection (UTI) is frequent, leads to later consequences and the main causal agent is Escherichia coli (E. coli). In other publications, it has been reported inactivity of homeopathy on E. coli cultures. Due to the divergence in the literature, the objective of this study was to evaluate gram-negative bacteria growth under homeopathy treatment. Methods: The medicines Atropa belladona, Cantharis, Staphysagria, and Colibacillinum were tested at 6CH, 12CH and 30CH in E. coli ATCC 25922 and EPEC (Enteropathogenic Escherichia coli) ATCC 43887. Two hundred and fifty microliters of the medicines in alcohol 30% were incubated at 37ºC with 3 mL of Müller Hinton broth (MH), 10 μL of cultures at 0.5 Macfarland and subsequent dilution at 1/10. Bacterial growth was evaluated in a spectrophotometer at 600nm, in the periods of 6, 12, and 20 hours of incubation. Results and Discussion: The results showed no inhibition of bacterial growth under the studied conditions. These data corroborate with studies already published that indicate the absence of action of homeopathy on E. coli cultures. Considering other studies, it can be suggested that homeopathic medicines have direct activity on the growth of Gram-positive and not Gram-negative bacteria. Evaluating the two bacterial groups, it is possible to assume that the difference in homeopathy activity could be linked to differences in the bacterial wall structure. This hypothesis should be evaluated by other tests with the same bacterial strains. Conclusion: The homeopathic medicines tested have no direct activity on Gram-negative bacteria cultures.

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A, Djimasde, Ryad Khalil, Talaat Atalla, Hany latif i Mahmoud Tanekhy. "Studies on Relationship Between Bacterial and Fungal Infections in Some Freshwater Fish". Alexandria Journal of Veterinary Sciences 74, nr 1 (2022): 59. http://dx.doi.org/10.5455/ajvs.29784.

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This study aimed to, spotlight on, isolation and identification of the most common Bacterial and systemic Mycotic agent from cultured Oreochromis niloticus, study the incidence, prevalence and organs distributions of the isolated Bacteria and Fungi among the examined diseased fish, investigated the effect of different water quality parameters on the incidence such etiological agents and relationship studies between Bacterial and Mycotic diseases in examined fish. A total number of 100 diseased O. niloticus that, weighed 80 ±mg and 18 ± 0.2 cm in length were randomly collected from earthen ponds in Alexandria private cultured freshwater farms in January 2021. A bacteriological analysis of naturally 400 samples isolated from 100 infected fishes confirmed 400 positive samples and mycological analysis of 400 samples confirmed 214 positive samples. Morphologically, isolated bacteria were Gram –ve represented by Pseudomonas fluorescence, Schwenellea spp, Pseudomonas putediae, Pseudomonas aeruoginosa and Gram +ve bacteria represented by Streptococcus agalactia. Fungal isolates are represented by Aspergillus niger, Asp. flavus, Asp. fumigatus, Asp. parasiticus, Geotrichum spp., Candida spp. and Torulopsis spp. Combination between bacteria and fungi in fish ponds agreviates the morbidity and mortality rates.

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Niño-Martínez, Nereyda, Marco Felipe Salas Orozco, Gabriel-Alejandro Martínez-Castañón, Fernando Torres Méndez i Facundo Ruiz. "Molecular Mechanisms of Bacterial Resistance to Metal and Metal Oxide Nanoparticles". International Journal of Molecular Sciences 20, nr 11 (8.06.2019): 2808. http://dx.doi.org/10.3390/ijms20112808.

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The increase in bacterial resistance to one or several antibiotics has become a global health problem. Recently, nanomaterials have become a tool against multidrug-resistant bacteria. The metal and metal oxide nanoparticles are one of the most studied nanomaterials against multidrug-resistant bacteria. Several in vitro studies report that metal nanoparticles have antimicrobial properties against a broad spectrum of bacterial species. However, until recently, the bacterial resistance mechanisms to the bactericidal action of the nanoparticles had not been investigated. Some of the recently reported resistance mechanisms include electrostatic repulsion, ion efflux pumps, expression of extracellular matrices, and the adaptation of biofilms and mutations. The objective of this review is to summarize the recent findings regarding the mechanisms used by bacteria to counteract the antimicrobial effects of nanoparticles.

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Vas, Ramona Alfred, Priyanka Mahendra Patil i Shweta Rajesh Pandey. "ANTIBACTERIAL ACTIVITY STUDIES ON PAPAYA LEAVES AND ORANGE PEELS AGAINST COMMON BACTERIAL SPECIES". Bulletin of Pharmaceutical Research 11, JAN-APR/MAY-AUG/SEP-DEC (2021): 1–7. http://dx.doi.org/10.21276/bpr.2021.11.2.

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MIURA, Hiroko, Emiko ISOGAI, Yuichi KATO, Keisuke KIOKA, Toshio SHIGETOMI, Hitomi WAKIZAKA, Hiroshi ISOGAI, Itsuo UEDA i Nobuyoshi ITO. "Studies on bacterial contamination of toothbrush." JOURNAL OF DENTAL HEALTH 38, nr 2 (1988): 180–85. http://dx.doi.org/10.5834/jdh.38.180.

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MOHY ELDIN, AHMED, GABER A. EL-DOSUKY, SAMER A. EL-SAYED i SAMER ABDEL-MONEM. "BIOCHEMICAL STUDIES ON BACTERIAL CHITINASE PRODUCTION". Egyptian Journal of Agricultural Research 85, nr 4 (1.12.2007): 1141–55. http://dx.doi.org/10.21608/ejar.2007.227564.

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Hoier, H., D. Röleke, C. Bartsch i W. Saenger. "Structural studies of a bacterial helicase". Acta Crystallographica Section A Foundations of Crystallography 52, a1 (8.08.1996): C125. http://dx.doi.org/10.1107/s0108767396094160.

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Ames, P., J. Chen, C. Wolff i J. S. Parkinson. "Structure-Function Studies of Bacterial Chemosensors". Cold Spring Harbor Symposia on Quantitative Biology 53 (1.01.1988): 59–65. http://dx.doi.org/10.1101/sqb.1988.053.01.010.

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SONOMOTO, KENJI. "Studies on bacterial catalase are diversifying." Kagaku To Seibutsu 36, nr 10 (1998): 656–57. http://dx.doi.org/10.1271/kagakutoseibutsu1962.36.656.

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Cheng, Zhenyu, Brendan J. McConkey i Bernard R. Glick. "Proteomic studies of plant–bacterial interactions". Soil Biology and Biochemistry 42, nr 10 (październik 2010): 1673–84. http://dx.doi.org/10.1016/j.soilbio.2010.05.033.

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Williamson, James R. "Biophysical studies of bacterial ribosome assembly". Current Opinion in Structural Biology 18, nr 3 (czerwiec 2008): 299–304. http://dx.doi.org/10.1016/j.sbi.2008.05.001.

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Grivet, J. P., M. Durand i J. L. Tholozan. "13C NMR studies of bacterial fermentations". Biochimie 74, nr 9-10 (wrzesień 1992): 897–901. http://dx.doi.org/10.1016/0300-9084(92)90073-n.

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Vassylyev, D. G., S. Sekine, O. Laptenko, J. Lee, M. N. Vassylyeva, S. Borukhov i S. Yokoyama. "Structural studies of bacterial transcription initiation". Acta Crystallographica Section A Foundations of Crystallography 58, s1 (6.08.2002): c307. http://dx.doi.org/10.1107/s0108767302097271.

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Pártl, Ondřej. "Computational Studies of Bacterial Colony Model". American Journal of Computational Mathematics 03, nr 02 (2013): 147–57. http://dx.doi.org/10.4236/ajcm.2013.32023.

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Pértile, Renata A. N., Susana Moreira, Rui M. Gil da Costa, Alexandra Correia, Luisa Guãrdao, Fátima Gartner, Manuel Vilanova i Miguel Gama. "Bacterial Cellulose: Long-Term Biocompatibility Studies". Journal of Biomaterials Science, Polymer Edition 23, nr 10 (8.05.2012): 1339–54. http://dx.doi.org/10.1163/092050611x581516.

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Dan, Talya Bergstein-Ben, Tonnies Frevert i Benzion Cavari. "The sulfide electrode in bacterial studies". Water Research 19, nr 8 (styczeń 1985): 983–85. http://dx.doi.org/10.1016/0043-1354(85)90366-5.

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Kroneck, Peter M. H., Wolfgang Jakob, Dale A. Webster i Richard DeMaio. "Studies on the bacterial hemoglobin fromVitreoscilla". Biology of Metals 4, nr 2 (1991): 119–25. http://dx.doi.org/10.1007/bf01135389.

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Abilev, Serikbai K., Elena V. Igonina, Darya A. Sviridova i Svetlana V. Smirnova. "Bacterial Lux Biosensors in Genotoxicological Studies". Biosensors 13, nr 5 (29.04.2023): 511. http://dx.doi.org/10.3390/bios13050511.

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The aim of this study was to assess the applicability of the bacterial lux biosensors for genotoxicological studies. Biosensors are the strains of E. coli MG1655 carrying a recombinant plasmid with the lux operon of the luminescent bacterium P. luminescens fused with the promoters of inducible genes: recA, colD, alkA, soxS, and katG. The genotoxicity of forty-seven chemical compounds was tested on a set of three biosensors pSoxS-lux, pKatG-lux and pColD-lux, which allowed us to estimate the oxidative and DNA-damaging activity of the analyzed drugs. The comparison of the results with the data on the mutagenic activity of these drugs from the Ames test showed a complete coincidence of the results for the 42 substances. First, using lux biosensors, we have described the enhancing effect of the heavy non-radioactive isotope of hydrogen deuterium (D2O) on the genotoxicity of chemical compounds as possible mechanisms of this effect. The study of the modifying effect of 29 antioxidants and radioprotectors on the genotoxic effects of chemical agents showed the applicability of a pair of biosensors pSoxS-lux and pKatG-lux for the primary assessment of the potential antioxidant and radioprotective activity of chemical compounds. Thus, the results obtained showed that lux biosensors can be successfully used to identify potential genotoxicants, radioprotectors, antioxidants, and comutagens among chemical compounds, as well as to study the probable mechanism of genotoxic action of test substance.

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Shah, Surabhi K., Edward A. Mcbean i William A. Anderson. "Preliminary studies into the disinfection of potable water using solar radiation". Canadian Journal of Civil Engineering 23, nr 2 (1.04.1996): 373–80. http://dx.doi.org/10.1139/l96-042.

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The efficacy and kinetics of water disinfection using solar radiation was studied, with respect to potential household or individual use in regions where treated drinking water is unavailable. Small volumes of sterilized water (1 L or less) were deliberately contaminated with various concentrations of Escherichia coli, and then exposed to solar radiation for several hours with periodic bacterial enumeration using plate count methods. An agar which was selective for fecal coliforms (mFC) was found to be inappropriate in this work as it often gave false negative counts, compared to the nonselective total plate count agar. The die-off of bacteria could be modelled, as a function of cumulative solar dose, in an exponential decay model. Decay rate constants of 0.071 to 0.486 m2∙MJ−1 were estimated. Volumes of 250 mL or less (in a 1 L bottle), and waters with lower bacterial concentrations or higher ionic strength, exhibited higher rates of die-off. Bacterial counts could be reduced from several thousands to less than 1 per millilitre (lower detection limit) during one day of solar irradiation. The source of the water and bottle material had a significant effect on the die-off rate. A Weibull distribution-based model has a conceptually better theoretical basis, and also fits the experimental data adequately at low and high doses. At intermediate solar doses, the Weibull model fit tended to underestimate the bacterial inactivation whereas the exponential decay model overestimated it. While solar disinfection appears useful for bacterial inactivation, it may be ineffective in situations where the major contaminants are the more UV resistant viruses or parasites, or where significant competition from physical or chemical water characteristics exists. It is not likely to be a suitable alternative to conventional chemical disinfection, but may be applicable in situations where no other disinfection is available. Key words: solar disinfection, potable water, coliform bacteria, inactivation kinetics, modelling.

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Andersson, Siv GE, i Andrew L. Goodman. "Bacterial genomes: next generation sequencing technologies for studies of bacterial ecosystems". Current Opinion in Microbiology 15, nr 5 (październik 2012): 603–4. http://dx.doi.org/10.1016/j.mib.2012.10.001.

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Tae-Bong, Kang, Hisham Yasmin, Lee Youngmin, Jhun Hyunjhung, Kim Joohee i Kim Soohyun. "Diabetes and bacterial infection". International Journal of Clinical Endocrinology and Metabolism 8, nr 1 (24.09.2022): 001–8. http://dx.doi.org/10.17352/ijcem.000054.

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People with diabetes are at increased risk of infection and are worried about biological agents such as bacteria. Particularly, foot infections, urinary tract infections, pneumonia, and skin diseases are due to bacterial infections that make diabetic patients suffer from clinical difficulties. Although antibiotics, one of the bacterial therapies, have been used, the emergence of multidrug-resistant bacteria is now in demand for alternative therapies. Although, many studies reported that antibiotic-resistant for bacterial infections and their rate have increased significantly in the diabetic patient population. Still, there is no report that directly compares the prevalence of antibiotic-resistant infections in diabetes types. In this review, we described the diverse types of diabetes with their bacterial infection and the reported resistance. Generally, diabetic patients are susceptible to vancomycin-resistant enterococcal infections, extended-spectrum β-lactamase-producing intestinal bacteria, carbapenem-resistant intestinal bacteria, and unfermented gram-negative bacilli. Thus, early detection of diabetes and prompt treatment are important to control chronic infections in diabetic patients.

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O’Boyle, C. J., J. MacFie, C. J. Mitchell, D. Johnstone, P. M. Sagar i P. C. Sedman. "Microbiology of bacterial translocation in humans". Gut 42, nr 1 (1.01.1998): 29–35. http://dx.doi.org/10.1136/gut.42.1.29.

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Background—Gut translocation of bacteria has been shown in both animal and human studies. Evidence from animal studies that links bacterial translocation to the development of postoperative sepsis and multiple organ failure has yet to be confirmed in humans.Aims—To examine the spectrum of bacteria involved in translocation in surgical patients undergoing laparotomy and to determine the relation between nodal migration of bacteria and the development of postoperative septic complications.Methods—Mesenteric lymph nodes (MLN), serosal scrapings, and peripheral blood from 448 surgical patients undergoing laparotomy were analysed using standard microbiological techniques.Results—Bacterial translocation was identified in 69 patients (15.4%). The most common organism identified wasEscherichia coli (54%). Both enteric bacteria, typical of indigenous intestinal flora, and non-enteric bacteria were isolated. Postoperative septic complications developed in 104 patients (23%). Enteric organisms were responsible in 74% of patients. Forty one per cent of patients who had evidence of bacterial translocation developed sepsis compared with 14% in whom no organisms were cultured (p<0.001). Septic morbidity was more frequent when a greater diversity of bacteria resided within the MLN, but this was not statistically significant.Conclusion—Bacterial translocation is associated with a significant increase in the development of postoperative sepsis in surgical patients. The organisms responsible for septic morbidity are similar in spectrum to those observed in the mesenteric lymph nodes. These data strongly support the gut origin hypothesis of sepsis in humans.

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Siggins, Matthew K., i Shiranee Sriskandan. "Bacterial Lymphatic Metastasis in Infection and Immunity". Cells 11, nr 1 (23.12.2021): 33. http://dx.doi.org/10.3390/cells11010033.

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Lymphatic vessels permeate tissues around the body, returning fluid from interstitial spaces back to the blood after passage through the lymph nodes, which are important sites for adaptive responses to all types of pathogens. Involvement of the lymphatics in the pathogenesis of bacterial infections is not well studied. Despite offering an obvious conduit for pathogen spread, the lymphatic system has long been regarded to bar the onward progression of most bacteria. There is little direct data on live virulent bacteria, instead understanding is largely inferred from studies investigating immune responses to viruses or antigens in lymph nodes. Recently, we have demonstrated that extracellular bacterial lymphatic metastasis of virulent strains of Streptococcus pyogenes drives systemic infection. Accordingly, it is timely to reconsider the role of lymph nodes as absolute barriers to bacterial dissemination in the lymphatics. Here, we summarise the routes and mechanisms by which an increasing variety of bacteria are acknowledged to transit through the lymphatic system, including those that do not necessarily require internalisation by host cells. We discuss the anatomy of the lymphatics and other factors that influence bacterial dissemination, as well as the consequences of underappreciated bacterial lymphatic metastasis on disease and immunity.

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Riyana, Bella, Desi Harneti Putri Huspa, Mieke Hemiawati Satari i Dikdik Kurnia. "The Potency of Catechin from Gambir (Uncaria gambir Roxb.) as a Natural Inhibitor of MurA (1UAE) Enzyme: In vitro and In silico studies". Letters in Drug Design & Discovery 17, nr 12 (19.11.2020): 1531–37. http://dx.doi.org/10.2174/1570180817999200714104737.

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Background: Currently, infectious diseases caused by pathogenic and resistant bacteria are more challenging for anti-bacterial drug discovery. The discovery of new anti-bacterial agents developed in many mechanisms includes disruption of the bacterial cell wall formations. The MurA is a key enzyme contributing to the first step of bacterial peptidoglycan biosynthesis and is, therefore, proposed as an effective bactericidal target. Objective: The purpose of this research is to identify anti-bacterial compounds from U. gambir Roxb and to predict the potential inhibitory activities against murA enzyme by in silico study. Materials and Methods: Investigation and discovery of new inhibitors of MurA enzyme were conducted on the medicinal plant of Gambir (Uncaria gambir Roxb) and those that reportedly contained anti-bacterial agents. The anti-bacterial compounds were isolated by combinations of chromatography methods guided by anti-bacterial activity against bacteria of E. faecalis, S. mutans, and S. sanguinis. The structures of active compounds were characterized by spectroscopic methods, and the anti-bacterial activity was evaluated by the microdilution method (in vitro) combined with molecular docking of the MurA enzyme (in silico). Results: The anti-bacterial flavonoids of catechin were isolated from U. gambir Roxb with MIC values of 6250 and 12500 ppm, respectively, against S. sanguinis and E. faecalis. The in silico study showed that catechin has a binding affinity of -8.5 Kcal/mol to MurA which is higher than fosfomycin as a positive control. Conclusions: The catechin is predicted to have potential as a new natural inhibitor of the MurA enzyme to inhibit bacterial cell wall biosynthesis.

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Mu, Ruimin, Qingyang Guo, Feng Qi, Yantian Jia, Qianya Meng i Gejiang Yu. "Advances in Studies on Nitrogen and Phosphorus Removal by Microalgal-Bacterial Consortia". E3S Web of Conferences 293 (2021): 01006. http://dx.doi.org/10.1051/e3sconf/202129301006.

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With the development of life and industry, the nutrients in sewage increased gradually. The emerging symbiotic system of algal and bacteria has remarkable effect in removing nutrients such as nitrogen and phosphorus. In this paper, the influence of nitrogen and phosphorus on bacteria-algal consortia and the absorption mechanism of nitrogen and phosphorus by the interaction of bacteria-algal consortia were analyzed, and a variety of methods for studying bacteria-algal consortia were summarized, mainly using isotope tracer technology to study the research results of bacteria and algae absorbing nitrogen and phosphorus in water. This method is of great significance for analyzing the mechanism of the treatment of nitrogen and phosphorus by the bacterial-algal symbiosis system from the microscopic point of view.

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