Dataset Information

The best of both worlds: A combined approach for analyzing microalgal diversity via metabarcoding and morphology-based methods.

ABSTRACT: An increasing number of studies use next generation sequencing (NGS) to analyze complex communities, but is the method sensitive enough when it comes to identification and quantification of species? We compared NGS with morphology-based identification methods in an analysis of microalgal (periphyton) communities. We conducted a mesocosm experiment in which we allowed two benthic grazer species to feed upon benthic biofilms, which resulted in altered periphyton communities. Morphology-based identification and 454 (Roche) pyrosequencing of the V4 region in the small ribosomal unit (18S) rDNA gene were used to investigate the community change caused by grazing. Both the NGS-based data and the morphology-based method detected a marked shift in the biofilm composition, though the two methods varied strongly in their abilities to detect and quantify specific taxa, and neither method was able to detect all species in the biofilms. For quantitative analysis, we therefore recommend using both metabarcoding and microscopic identification when assessing the community composition of eukaryotic microorganisms.

SUBMITTER: Groendahl S

PROVIDER: S-EPMC5325584 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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The best of both worlds: A combined approach for analyzing microalgal diversity via metabarcoding and morphology-based methods.

Groendahl Sophie S Kahlert Maria M Fink Patrick P

PloS one 20170224 2

An increasing number of studies use next generation sequencing (NGS) to analyze complex communities, but is the method sensitive enough when it comes to identification and quantification of species? We compared NGS with morphology-based identification methods in an analysis of microalgal (periphyton) communities. We conducted a mesocosm experiment in which we allowed two benthic grazer species to feed upon benthic biofilms, which resulted in altered periphyton communities. Morphology-based ident ...[more]

PMID: 28234997

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Project description:Abstract Biceps tendinopathy and superior labrum anterior posterior lesions are a common source of shoulder pain and disability and can be effectively treated with biceps tenodesis. There are a variety of open and arthroscopic tenodesis techniques, but no one technique has demonstrated superiority. Arthroscopic techniques often disregard the extra-articular portions of the biceps tendon as a potential source of pain. Open techniques address this concern; however, they can be associated with wound complications, increased blood loss, nerve injury, and disruptions to surgical workflow. Here, we describe an all arthroscopic tenodesis technique at the suprapectoral zone of the tendon. This method addresses extra-articular sources of pain, while limiting the potential pitfalls of open surgery. Technique Video Video 1 Narrated technique video. Standard posterior, anterior, lateral, and low anterior portals are used during the technique. Viewing from the posterior portal in a right shoulder the biceps anchor is debrided to a stable base. A BirdBeak device is inserted through the standard anterior portal and pierces the biceps tendon as laterally as possible, and an 18-gauge spinal needle is used to tease the suture from the BirdBeak device. After a standard subacromial decompression is performed the camera is inserted into the standard lateral portal, and an anterior subdeltoid bursectomy is performed to provide adequate visualization of the tenodesis site. An accessory low anterior portal is created about 1.5 cm proximal to the pectoralis major tendon insertion. The pectoralis major insertion site is used to aid in localization of the tendon just proximal to the subdeltoid portion of the tendon. An 11-blade is inserted through the low anterior portal and used to incise the transverse humeral ligament; the biceps tendon will often bulge from beneath the ligament at this step, confirming appropriate position. The bicep tendon is retracted with the probe, and a noncannulated 8-mm reamer is inserted into the low anterior portal and used to produce a unicortical tunnel. The tunnel’s edges are debrided using an arthroscopic shaver and the arthroscopic electrocautery device; the inferior portion of the tunnel must be smooth to prevent fraying of the tendon. The biceps tendon is then tensioned appropriately via tension pulled through the previously placed suture. A fork-tipped interference screw is then introduced through the low anterior portal to introduce the biceps tendon into the tenodesis site. The interference screw is then inserted and left 1 mm proud. The residual proximal bicep tendon is then amputated using an arthroscopic biter and removed through the lateral portal. The finished tenodesis site is probed and inspected, and a standard postoperative protocol is used.

Dataset Information

The best of both worlds: A combined approach for analyzing microalgal diversity via metabarcoding and morphology-based methods.

Publications

The best of both worlds: A combined approach for analyzing microalgal diversity via metabarcoding and morphology-based methods.

Similar Datasets

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