Saline systems最新文献_第8页

Organic compatible solutes of halotolerant and halophilic microorganisms. 耐盐和嗜盐微生物的有机相容溶质。

Saline systems Pub Date : 2005-08-04 DOI: 10.1186/1746-1448-1-5

Mary F Roberts

引用次数: 340

A hundred years of Dunaliella research: 1905-2005. 杜氏藻百年研究:1905-2005。

Saline systems Pub Date : 2005-07-04 DOI: 10.1186/1746-1448-1-2

Aharon Oren

引用次数: 384

UV irradiation induces homologous recombination genes in the model archaeon, Halobacterium sp. NRC-1. 紫外线照射诱导模式古细菌盐杆菌NRC-1同源重组基因。

Saline systems Pub Date : 2005-07-04 DOI: 10.1186/1746-1448-1-3

Shirley McCready, Jochen A Müller, Ivan Boubriak, Brian R Berquist, Wooi Loon Ng, Shiladitya DasSarma

{"title":"UV irradiation induces homologous recombination genes in the model archaeon, Halobacterium sp. NRC-1.","authors":"Shirley McCready, Jochen A Müller, Ivan Boubriak, Brian R Berquist, Wooi Loon Ng, Shiladitya DasSarma","doi":"10.1186/1746-1448-1-3","DOIUrl":"https://doi.org/10.1186/1746-1448-1-3","url":null,"abstract":"Background: A variety of strategies for survival of UV irradiation are used by cells, ranging from repair of UV-damaged DNA, cell cycle arrest, tolerance of unrepaired UV photoproducts, and shielding from UV light. Some of these responses involve UV-inducible genes, including the SOS response in bacteria and an array of genes in eukaryotes. To address the mechanisms used in the third branch of life, we have studied the model archaeon, Halobacterium sp. strain NRC-1, which tolerates high levels of solar radiation in its natural hypersaline environment.Results: Cells were irradiated with 30-70 J/m(2) UV-C and an immunoassay showed that the resulting DNA damage was largely repaired within 3 hours in the dark. Under such conditions, transcriptional profiling showed the most strongly up-regulated gene was radA1, the archaeal homolog of rad51/recA, which was induced 7-fold. Additional genes involved in homologous recombination, such as arj1 (recJ-like exonuclease), dbp (eukaryote-like DNA binding protein of the superfamily I DNA and RNA helicases), and rfa3 (replication protein A complex), as well as nrdJ, encoding for cobalamin-dependent ribonucleotide reductase involved in DNA metabolism, was also significantly induced in one or more of our experimental conditions. Neither prokaryotic nor eukaryotic excision repair gene homologs were induced and there was no evidence of an SOS-like response.Conclusion: These results show that homologous recombination plays an important role in the cellular response of Halobacterium sp. NRC-1 to UV damage. Homologous recombination may permit rescue of stalled replication forks, and/or facilitate recombinational repair. In either case, this provides a mechanism for the observed high-frequency recombination among natural populations of halophilic archaea.","PeriodicalId":87359,"journal":{"name":"Saline systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/1746-1448-1-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25598402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 95

Effect of salinity stress on the life history variables of Branchipus schaefferi Fisher, 1834 (Crustacea: Anostraca). 盐度胁迫对雪氏Branchipus schaefferi Fisher(甲壳纲:Anostraca)生活史变量的影响。

Saline systems Pub Date : 2005-07-04 DOI: 10.1186/1746-1448-1-4

S S S Sarma, Lynda Beladjal, S Nandini, Gerardo Cerón-Martínez, Karina Tavera-Briseño

{"title":"Effect of salinity stress on the life history variables of Branchipus schaefferi Fisher, 1834 (Crustacea: Anostraca).","authors":"S S S Sarma, Lynda Beladjal, S Nandini, Gerardo Cerón-Martínez, Karina Tavera-Briseño","doi":"10.1186/1746-1448-1-4","DOIUrl":"https://doi.org/10.1186/1746-1448-1-4","url":null,"abstract":"Background: Freshwater anostracans inhabit ephemeral water bodies in which as the water level decreases due to evaporation the salt concentration increases. Thus, for most anostracans salinity becomes the major stress factor.Results: We tested five concentrations of NaCl (0 to 8 g/l) on the life table demography of Branchipus schaefferi fed Chlorella (alga). Age-specific survivorship curves of male and female B. schaefferi showed nearly a similar pattern in that increased salt concentration resulted in decreased survivorship. The age-specific reproduction (m(x)) of females showed several peaks of cyst production at 0 and 1 g/l salinity while in treatments containing salt at 4 or 8 g/l, there were fewer peaks. Average lifespan, life expectancy at birth, gross and net reproductive rates, generation time and the rate of population increase were all significantly influenced by the salt concentration in the medium. The highest value of net reproductive rate (970 cysts/female) was in treatments containing 0 g/l of salt, while the lowest was 13 cysts/female at 8 g/l. The rate of population increase (r) varied from 0.52 to 0.32 per day depending on the salt concentration in the medium.Conclusion: The low survival and offspring production of B. schaefferi at higher salinity levels suggests that this species is unlikely to colonize inland saline water bodies. Therefore, the temporary ponds in which it is found, proper conservative measures must be taken to protect this species.","PeriodicalId":87359,"journal":{"name":"Saline systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/1746-1448-1-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25598399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Saline Systems: a research journal bridging gene systems and ecosystems. 生理盐水系统:一个研究期刊桥接基因系统和生态系统。

Saline systems Pub Date : 2005-07-04 DOI: 10.1186/1746-1448-1-1

Shiladitya DasSarma

引用次数: 122

Organic compatible solutes of halotolerant and halophilic microorganisms. 耐盐和嗜盐微生物的有机相容溶质。

Saline systems Pub Date : 2005-01-01 DOI: 10.1016/S0580-9517(08)70029-1

M. Roberts

引用次数: 285