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We investigate the phenomenon of stochastic bursting in a noisy excitable unit with multiple weak delay feedbacks, by virtue of a directed tree lattice model. We find statistical properties of the appearing sequence of spikes and expressions for the power spectral density. This simple model is extended to a network of three units with delayed coupling of a star type. We find the power spectral density of each unit and the cross-spectral density between any two units. The basic assumptions behind the analytical approach are the separation of timescales, allowing for a description of the spike train as a point process, and weakness of coupling, allowing for a representation of the action of overlapped spikes via the sum of the one-spike excitation probabilities.While the process of meiosis is highly conserved across eukaryotes, the sexual systems that govern life cycle phase transitions are surprisingly labile. Switches between sexual systems have profound evolutionary and ecological consequences, in particular for plants, but our understanding of the fundamental mechanisms and ultimate causes underlying these transitions is still surprisingly incomplete. We explore here the idea that brown and green algae may be interesting comparative models that can increase our understanding of relevant processes in plant reproductive biology, from evolution of gamete dimorphism, gametogenesis, sex determination and transitions in sex-determining systems.
To summarize guidelines on self-care and clinical management of persons with laryngectomy during the COVID-19 pandemic.
Articles published in electronic databases-PubMed, Scopus, Web of Science, and CINHAL with the compliant keywords-were scouted from December 2019 to November 2020. All original articles, letters to editors, reviews, and consensus statements were reviewed and included.
In all, 20 articles that had information pertaining to self-care of persons with laryngectomy or guidelines for clinicians working with this population were identified. Four of the included studies were case reports of persons with laryngectomy who contracted the COVID-19 virus. One of the included articles was a cohort study that explored the use of telerehabilitation in persons with laryngectomy.
The hallmarks of preventative strategies for persons with laryngectomy during the COVID-19 pandemic are as follows physical distancing, use of a three-ply mask or surgical mask to cover the mouth and nose, and use of Heat Moim the tracheal and nasal swabs, necessitating compulsory inclusion of both nasal and tracheal swabs.Codon usage bias influences the genetic features prevalent in genomes of all the organisms. It also plays a crucial role in establishing the host-pathogen relationship. The present study elucidates the role of codon usage pattern regarding the predilection of fungal pathogens Aspergillus flavus, Aspergillus niger, Fusarium oxysporum and Colletotrichum gloeosporioides towards host plant Zingiber officinale. We found a similar trend of codon usage pattern operative in plant and fungal pathogens. This concurrence might be attributed for the colonization of fungal pathogens in Z. officinale. The transcriptome of both plant and pathogens showed bias towards GC-ending codons. Natural selection and mutational pressure seem to be accountable for shaping the codon usage pattern of host and pathogen. We also identified some distinctive preferred codons in A. flavus, F. oxysporum and Z. officinale that could be regarded as signature codons for the identification of these organisms. Knowledge of favored, avoided and unique codons will help to devise strategies for reducing spice losses due to fungal pathogens.
The suitability of laparoscopic varicocelectomy for assisted reproductive technology depends on the improvement of semen parameters. The present study analyzed the improvement of semen parameters following laparoscopic varicocele ligation.
Aretrospective study of the laparoscopic varicocele clippings at the Department of Urology of University Hospital of Kiel between the years 2007 and 2019 was conducted. The semen analyses according to WHO standards (sperm count, density, motility and morphology) were conducted before and 12months after surgery. Screening for surgical complications took place at the time of the follow-up seminal analysis. Included were patients with oligozoospermia, asthenozoospermia and/or teratozoospermia (group1, OAT) or with nonobstructive azoospermia (group2, NOA).
This study included data of 27patients and 22patients presented preoperative OAT (81%, group1). Another 5patients showed NOA (19%, group2). Data of group1 showed that semen parameters normalized in 32% of the patients after surgery. Significant improvement in total sperm count (p < 0.005), sperm density (p < 0.005) and total motile sperm count (p < 0.005) was observed. No deterioration of semen parameters was observed. In group2 we detected spermatozoa in1 case in the postoperative ejaculate. None of the patients showed complications according to the Clavien-Dindo classification, postoperative hydrocele formation or recurrence of varicocele at the time of control spermiogram.
Laparoscopic varicocelectomy is avalid therapeutic approach to improve semen parameters for further assisted reproductive techniques. Spermatogenesis may be induced for patients with NOA. Normalization of semen parameters can be achieved for patients with OAT.
Laparoscopic varicocelectomy is a valid therapeutic approach to improve semen parameters for further assisted reproductive techniques. Spermatogenesis may be induced for patients with NOA. Normalization of semen parameters can be achieved for patients with OAT.
Recent reports suggest an increasing incidence of hepatitisC virus (HCV) infections among MSM (men-who-have-sex-with-men). Early treatment with direct-acting antivirals (DAAs) achieves high cure rates and prevents further HCV transmission. We offered barrier-free HCV screening in the Viennese MSM population and immediate access to DAA treatment.
In collaboration with gay health specialists, we screened for HCV seropositivity in Viennese MSM between 2019 and 2020. Barrier-free HCV-RNA-PCR tests, transient elastography (TE) and immediate access to DAA treatment were offered.
A total of 310 HCV-seropositive patients were identified. Of those, 145 could be contacted and 109 attended their appointment at our clinic. Linderalactone cost HIV-coinfection was highly prevalent in our cohort (n = 86/145; 78.9%), while pre-exposure prophylaxis (PrEP) was taken by 21.7% (n = 5/23) of non-HIV patients. Sexual risk behavior and (history of) intravenous drug use was reported by 32.1% and 13.8% of patients, respectively. Most MSM had already achieved sustained virological response (SVR) to previous antiviral treatment (n = 72, 66.
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