Communicative and Integrative Biology最新文献_第10页

Communicative and Integrative Biology Pub Date : 2020-10-11 DOI: 10.1080/19420889.2020.1822583

Andrew Lohrey, Bruce Boreham

引用次数: 5

New insights into the limited thermotolerance of anhydrobiotic tardigrades. 对无水缓步动物有限耐热性的新认识。

Communicative and Integrative Biology Pub Date : 2020-09-09 DOI: 10.1080/19420889.2020.1812865

Ricardo Cardoso Neves, Robyn M Stuart, Nadja Møbjerg

{"title":"New insights into the limited thermotolerance of anhydrobiotic tardigrades.","authors":"Ricardo Cardoso Neves, Robyn M Stuart, Nadja Møbjerg","doi":"10.1080/19420889.2020.1812865","DOIUrl":"https://doi.org/10.1080/19420889.2020.1812865","url":null,"abstract":"The recent discovery of an upper limit in the tolerance of an extremotolerant tardigrade to high temperatures is astounding. Although these microinvertebrates are able to endure severe environmental conditions, including desiccation, freezing and high levels of radiation, high temperatures seem to be an Achilles' heel for active tardigrades. Moreover, exposure-time appears to be a limiting factor for the heat stress tolerance of the otherwise highly resilient desiccated (anhydrobiotic) tardigrades. Indeed, the survival rate of desiccated tardigrades exposed to high temperatures for 24 hours is significantly lower than for exposures of only 1 hour. Here, we investigate the effect of 1 week of high temperature exposures on desiccated tardigrades with the aim of elucidating whether exposure-times longer than 24 hours decrease survival even further. From our analyses we estimate a significant decrease in the 50% mortality temperature from 63ºC to 56ºC for Ramazzottius varieornatus exposed to high temperatures in the desiccated tun state for 24 hours and 1 week, respectively. This negative correlation between exposure-time and tolerance to high temperatures probably results from the interference of intracellular temperature with the homeostasis of macromolecules. We hypothesize that high temperatures denature molecules that play a vital role in sustaining and protecting the anhydrobiotic state.","PeriodicalId":39647,"journal":{"name":"Communicative and Integrative Biology","volume":" ","pages":"140-146"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/19420889.2020.1812865","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38451890","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: 4

Hidden Allee effect in photosynthetic organisms. 光合生物的隐巷效应。

Communicative and Integrative Biology Pub Date : 2020-08-30 DOI: 10.1080/19420889.2020.1800999

Hiroshi Ohkawa, Chiharu Takatsuka, Tomonori Kawano

{"title":"Hidden Allee effect in photosynthetic organisms.","authors":"Hiroshi Ohkawa, Chiharu Takatsuka, Tomonori Kawano","doi":"10.1080/19420889.2020.1800999","DOIUrl":"https://doi.org/10.1080/19420889.2020.1800999","url":null,"abstract":"In ecology and population biology, logistic equation is widely applied for simulating the population of organisms. By combining the logistic model with the low-density effect called Allee effect, several variations of mathematical expressions have been proposed. The upper half of the work was dedicated to establish a novel equation for highly flexible density effect model with Allee threshold. Allee effect has been rarely observed in microorganisms with asexual reproduction despite of theoretical studies. According to the exploitation ecosystem hypotheses, plants are believed to be insensitive to Allee effect. Taken together, knowledge on the existence of low-density effect in photosynthetic microorganisms is required for redefining the ecological theories emphasizing the photosynthetic organisms as the basis for food chains. Therefore, in the lower half of the present article, we report on the possible Allee effect in photo-autotrophic organisms, namely, green paramecia, and cyanobacteria. Optically monitored growth of green paramecia was shown to be regulated by Allee-like weak low-density effect under photo-autotrophic and photo-heterotrophic conditions. Insensitiveness of wild type cyanobacteria (Synechocystis sp. Strain PCC6803) to low-density effect was confirmed, as consistent with our empirical knowledge. In contrast, a mutant line of PCC6803 impaired with a photosynthesis-related pxcA gene was shown to be sensitive to typical Allee's low-density effect (i.e. this line of cells failed to propagate at low cellular density while cells start logarithmic growth at relatively higher inoculating density). This is the first observation that single-gene mutation in an autotrophic organism alters the sensitivity to Allee effect.","PeriodicalId":39647,"journal":{"name":"Communicative and Integrative Biology","volume":" ","pages":"119-127"},"PeriodicalIF":0.0,"publicationDate":"2020-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/19420889.2020.1800999","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38451888","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: 1

GPCR receptor phosphorylation and endocytosis are not necessary to switch polarized growth between internal cues during pheromone response in S. cerevisiae. 在信息素反应过程中，酿酒葡萄球菌的GPCR受体磷酸化和内吞作用对于在内部信号之间切换极化生长并不是必需的。

Communicative and Integrative Biology Pub Date : 2020-08-20 DOI: 10.1080/19420889.2020.1806667

Gustavo Vasen, Paula Dunayevich, Andreas Constantinou, Alejandro Colman-Lerner

{"title":"GPCR receptor phosphorylation and endocytosis are not necessary to switch polarized growth between internal cues during pheromone response in S. cerevisiae.","authors":"Gustavo Vasen, Paula Dunayevich, Andreas Constantinou, Alejandro Colman-Lerner","doi":"10.1080/19420889.2020.1806667","DOIUrl":"10.1080/19420889.2020.1806667","url":null,"abstract":"Chemotactic/chemotropic cells follow accurately the direction of gradients of regulatory molecules. Many G-protein-coupled receptors (GPCR) function as chemoattractant receptors to guide polarized responses. In \"a\" mating type yeast, the GPCR Ste2 senses the α-cell's pheromone. Previously, phosphorylation and trafficking of this receptor have been implicated in the process of gradient sensing, where cells dynamically correct growth. Correction is often necessary since yeast have intrinsic polarity sites that interfere with a correct initial gradient decoding. We have recently showed that when actively dividing (not in G1) yeast are exposed to a uniform pheromone concentration, they initiate a pheromone-induced polarization next to the mother-daughter cytokinesis site. Then, they reorient their growth to the intrinsic polarity site. Here, to study if Ste2 phosphorylation and internalization are involved in this process, we generated receptor variants combining three types of mutated signals for the first time: phosphorylation, ubiquitylation and the NPFX1,2D Sla1-binding motif. We first characterized their effect on endocytosis and found that these processes regulate internalization in a more complex manner than previously shown. Interestingly, we showed that receptor phosphorylation can drive internalization independently of ubiquitylation and the NPFX1,2D motif. When tested in our assays, cells expressing either phosphorylation or endocytosis-deficient receptors were able to switch away from the cytokinesis site to find the intrinsic polarity site as efficiently as their WT counterparts. Thus, we conclude that these processes are not necessary for the reorientation of polarization.","PeriodicalId":39647,"journal":{"name":"Communicative and Integrative Biology","volume":" ","pages":"128-139"},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/19420889.2020.1806667","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38451889","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: 2

Emergence of informative higher scales in biological systems: a computational toolkit for optimal prediction and control. 生物系统中信息量更大尺度的出现：优化预测和控制的计算工具包。

Communicative and Integrative Biology Pub Date : 2020-08-15 DOI: 10.1080/19420889.2020.1802914

Erik Hoel, Michael Levin

引用次数: 0

What are the principles that govern life? 支配生命的原则是什么?

Communicative and Integrative Biology Pub Date : 2020-08-10 DOI: 10.1080/19420889.2020.1803591

Jaime Gómez-Márquez

引用次数: 8

Mutation accumulation and horizontal gene transfer in Escherichia coli colonizing the gut of old mice. 在老龄小鼠肠道中定植的大肠杆菌的突变积累和水平基因转移。

Communicative and Integrative Biology Pub Date : 2020-06-24 DOI: 10.1080/19420889.2020.1783059

Hugo C Barreto, Nelson Frazão, Ana Sousa, Anke Konrad, Isabel Gordo

引用次数: 0

Putative genome features of relic green alga-derived nuclei in dinoflagellates and future perspectives as model organisms. 鞭毛藻残藻核的基因组特征及其作为模式生物的前景。

Communicative and Integrative Biology Pub Date : 2020-06-21 DOI: 10.1080/19420889.2020.1776568

Takuro Nakayama, Kazuya Takahashi, Ryoma Kamikawa, Mitsunori Iwataki, Yuji Inagaki, Goro Tanifuji

{"title":"Putative genome features of relic green alga-derived nuclei in dinoflagellates and future perspectives as model organisms.","authors":"Takuro Nakayama, Kazuya Takahashi, Ryoma Kamikawa, Mitsunori Iwataki, Yuji Inagaki, Goro Tanifuji","doi":"10.1080/19420889.2020.1776568","DOIUrl":"https://doi.org/10.1080/19420889.2020.1776568","url":null,"abstract":"Nucleomorphs, relic endosymbiont nuclei, have been studied as a model to elucidate the evolutionary process of integrating a eukaryotic endosymbiont into a host cell organelle. Recently, we reported two new dinoflagellates possessing nucleomorphs, and proposed them as new models in this research field based on the following findings: genome integration processes are incomplete, and the origins of the endosymbiont lineages were pinpointed. Here, we focused on the nucleomorph genome features in the two green dinoflagellates and compared them with those of the known nucleomorph genomes of cryptophytes and chlorarachniophytes. All nucleomorph genomes showed similar trends suggesting convergent evolution. However, the number of nucleomorph genes that are unrelated to housekeeping machineries in the two green dinoflagellates are greater than the numbers in cryptophytes and chlorarachniophytes, providing additional evidence that their genome reduction has not progressed much compared with those of cryptophytes and chlorarachniophytes. Finally, potential future work is discussed.","PeriodicalId":39647,"journal":{"name":"Communicative and Integrative Biology","volume":" ","pages":"84-88"},"PeriodicalIF":0.0,"publicationDate":"2020-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/19420889.2020.1776568","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38453450","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: 4

Burrowing activity of coconut rhinoceros beetle on Guam cycads. 椰子角甲虫在关岛苏铁上的挖洞活动。

Communicative and Integrative Biology Pub Date : 2020-06-02 DOI: 10.1080/19420889.2020.1774310

Thomas E Marler, Frankie C Matanane, L Irene Terry

{"title":"Burrowing activity of coconut rhinoceros beetle on Guam cycads.","authors":"Thomas E Marler, Frankie C Matanane, L Irene Terry","doi":"10.1080/19420889.2020.1774310","DOIUrl":"https://doi.org/10.1080/19420889.2020.1774310","url":null,"abstract":"Guam's established population of non-native coconut rhinoceros beetle (CRB, Oryctes rhinoceros L.) began creating burrows in stem apices of several cycad species in a managed garden. We conducted an island-wide survey to determine the spatial patterns of CRB burrowing of stems of in situ Cycas micronesica. We also measured starch of healthy and unhealthy coconut leaf tissue and compared this with starch of cycad stem tissue. The starch concentration of the central unexpanded leaf in healthy Philippine coconut trees was ≈90 mg·g-1, and that of unhealthy Guam coconut trees was ≈40 mg·g-1. The starch concentration of the tissue within the CRB burrow locations on C. micronesica trees was 145 mg·g-1. Burrowing of C. micronesica was restricted to female CRB adults and was found throughout the full latitudinal gradient of Guam. Our findings indicate Guam's unhealthy coconut trees are no longer nutrient-dense, and the female CRB population may have exhibited a phylogenetically distant host shift to the abundant C. micronesica plants for a starch-rich diet within the concepts of the 'ecological fitting' hypothesis. We add proximity to coconut tree habitats as a new threat to Guam's endangered C. micronesica population.","PeriodicalId":39647,"journal":{"name":"Communicative and Integrative Biology","volume":" ","pages":"74-83"},"PeriodicalIF":0.0,"publicationDate":"2020-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/19420889.2020.1774310","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38453449","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: 9

Airborne signals and abiotic factors: the neglected side of the plant communication. 空气信号与非生物因子:植物通讯中被忽视的一面。

Communicative and Integrative Biology Pub Date : 2020-05-18 eCollection Date: 2020-01-01 DOI: 10.1080/19420889.2020.1767482

Marco Landi

引用次数: 6