Air Quality Monitoring and the Safety of Farmworkers in Wildfire Mandatory Evacuation Zones.

The increasing frequency and severity of wildfires due to climate change pose health risks to migrant farm workers laboring in wildfire-prone regions. This study focuses on Sonoma County, California, investigating the effectiveness of air monitoring and safety protections for farmworkers. The analysis employs AirNow and PurpleAir PM2.5 data acquired during the 2020 wildfire season, comparing spatial variability in air pollution. Results show significant differences between the single Sonoma County AirNow station data and the PurpleAir data in the regions directly impacted by wildfire smoke. Three distinct wildfire pollution episodes with elevated PM2.5 levels are identified to examine the regional variations. This study also examines the system used to exempt farmworkers from wildfire mandatory evacuation orders, finding incomplete information, ad hoc decision-making, and scant enforcement. In response, we make policy recommendations that include stricter requirements for employers, real-time air quality monitoring, post-exposure health screenings, and hazard pay. Our findings underscore the need for significant consideration of localized air quality readings and the importance of equitable disaster policies for protecting the health of farmworkers (particularly those who are undocumented migrants) in the face of escalating wildfire risks.

Climate Change, Migration, and Health Disparities at and Beyond the US-Mexico Border.

This JAMA Insights in the Climate Change and Health series discusses the increase in extreme weather events caused by climate change and how these events bring about increased migration due to effects on water availability, food access, and rates of endemic diseases.

Diversifying cardiac intensive care unit models: Successful example of an operating surgeon-led unit.

Objective: The intensivist-led cardiovascular intensive care unit model is the standard of care in cardiac surgery. This study examines whether a cardiovascular intensive care unit model that uses operating cardiac surgeons, cardiothoracic surgery residents, and advanced practice providers is associated with comparable outcomes. Methods: This is a single-institution review of the first 400 cardiac surgery patients admitted to an operating surgeon-led cardiovascular intensive care unit from 2020 to 2022. Inclusion criteria are elective status and operations managed by both cardiovascular intensive care unit models (aortic operations, valve operations, coronary operations, septal myectomy). Patients from the surgeon-led cardiovascular intensive care unit were exact matched by operation type and 1:1 propensity score matched with controls from the traditional cardiovascular intensive care unit using a logistic regression model that included age, sex, preoperative mortality risk, incision type, and use of cardiopulmonary bypass and circulatory arrest. Primary outcome was total postoperative length of stay. Secondary outcomes included postoperative intensive care unit length of stay, 30-day mortality, 30-day Society of Thoracic Surgeons-defined morbidity (permanent stroke, renal failure, cardiac reoperation, prolonged intubation, deep sternal infection), packed red cell transfusions, and vasopressor use. Outcomes between the 2 groups were compared using chi-square, Fisher exact test, or 2-sample t test as appropriate. Results: A total of 400 patients from the surgeon-led cardiovascular intensive care unit (mean age 61.2 ± 12.8 years, 131 female patients [33%], 346 patients [86.5%] with European System for Cardiac Operative Risk Evaluation II <2%) and their matched controls were included. The most common operations across both units were coronary artery bypass grafting (n = 318, 39.8%) and mitral valve repair or replacement (n = 238, 29.8%). Approximately half of the operations were performed via sternotomy (n = 462, 57.8%). There were 3 (0.2%) in-hospital deaths, and 47 patients (5.9%) had a 30-day complication. The total length of stay was significantly shorter for the surgeon-led cardiovascular intensive care unit patients (6.3 vs 7.0 days, P = .028), and intensive care unit length of stay trended in the same direction (2.5 vs 2.9 days, P = .16). Intensive care unit readmission rates, 30-day mortality, and 30-day morbidity were not significantly different between cardiovascular intensive care unit models. The surgeon-led cardiovascular intensive care unit was associated with fewer postoperative red blood cell transfusions in the cardiovascular intensive care unit (P = .002) and decreased vasopressor use (P = .001). Conclusions: In its first 2 years, the surgeon-led cardiovascular intensive care unit demonstrated comparable outcomes to the traditional cardiovascular intensive care unit with significant improvements in total length of stay, postoperative transfusions in the cardiovascular intensive care unit, and vasopressor use. This early success exemplifies how an operating surgeon-led cardiovascular intensive care unit can provide similar outcomes to the standard-of-care model for patients undergoing elective cardiac surgery.

Queer and present danger: understanding the disparate impacts of disasters on LGBTQ+ communities.

LGBTQ+ communities comprise 16 million individuals in the United States, yet this population is often rendered invisible within disaster policies. Bias in federal disaster response programmes, a lack of recognition of LGBTQ+ families, and the prevalence of faith-based organisations in disaster relief services together heighten the risks that LGBTQ+ individuals face. This paper describes the ways in which this reality combines with the contextual vulnerability of LGBTQ+ communities, whereby existing inequalities and marginalisation are exacerbated during disasters and in their aftermath. As a result, the immediate trauma of a disaster, such as physical injury or the loss of loved ones or possessions, is compounded in multiple ways for LGBTQ+ individuals, making them less likely to benefit from disaster relief services. To address these inequalities, the paper concludes with a set of policy recommendations to inform prevention, mitigation, and recovery planning, as well as to reduce the impacts of disasters on LGBTQ+ individuals.

The (in)visible victims of disaster: Understanding the vulnerability of undocumented Latino/a and indigenous immigrants.

As climate change advances, communities across the United States are adapting to the increased threat of wildfires, drought, heatwaves, and infectious diseases. Such disasters are expected to become more frequent and severe. Now more than ever, it is crucial to understand how these events amplify existing inequalities, and how to lessen the resulting harms. Differences in human vulnerability to disaster stem from a range of social, economic, historical, and political factors. We argue that given their social status, undocumented Latino/a and Indigenous immigrants are particularly vulnerable to disasters and require special consideration in disaster planning. They are disproportionately affected by racial discrimination, exploitation, economic hardships, less English and Spanish proficiency, and fear of deportation in their everyday lives- their pre-disaster marginalized status. In the case of the Thomas Fire in California's Ventura and Santa Barbara counties, we show that emergency response and recovery efforts ignored their needs. Resources were directed toward privileged individuals, leaving local immigrant rights and environmental justice groups to provide essential services such as language access to emergency information in Spanish and Indigenous tongues; labor protections for farmworkers endangered in the fields; and a private disaster relief fund for undocumented immigrants ineligible for federal aid. The article concludes with preliminary participant observations from the COVID-19 pandemic response in the region, indicating how lessons from the fire have informed official actions. As governments grapple with the increasing severity of disasters, understanding the differential impacts on undocumented immigrants can help improve disaster planning to protect the most vulnerable and stigmatized populations.

Communication Training in Adult and Pediatric Critical Care Medicine. A Systematic Review.

Background: Interpersonal and communication skills are essential for physicians practicing in critical care settings. Accordingly, demonstration of these skills has been a core competency of the Accreditation Council for Graduate Medical Education since 2014. However, current practices regarding communication skills training in adult and pediatric critical care fellowships are not well described. Objective: To describe the current state of communication curricula and training methods in adult and pediatric critical care training programs as demonstrated by the published literature. Methods: We performed a systematic review of the published literature using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses checklist. Three authors reviewed a comprehensive set of databases and independently selected articles on the basis of a predefined set of inclusion and exclusion criteria. Data were independently extracted from the selected articles. Results: The 23 publications meeting inclusion criteria fell into the following study classifications: intervention (n = 15), cross-sectional survey (n = 5), and instrument validation (n = 3). Most interventional studies assessed short-term and self-reported outcomes (e.g., learner attitudes and perspectives) only. Fifteen of 22 publications represented pediatric subspecialty programs. Conclusion: Opportunities exist to evaluate the influence of communication training programs on important outcomes, including measured learner behavior and patient and family outcomes, and the durability of skill retention.

Explaining differential vulnerability to climate change: A social science review.

The varied effects of recent extreme weather events around the world exemplify the uneven impacts of climate change on populations, even within relatively small geographic regions. Differential human vulnerability to environmental hazards results from a range of social, economic, historical, and political factors, all of which operate at multiple scales. While adaptation to climate change has been the dominant focus of policy and research agendas, it is essential to ask as well why some communities and peoples are disproportionately exposed to and affected by climate threats. The cases and synthesis presented here are organized around four key themes (resource access, governance, culture, and knowledge), which we approach from four social science fields (cultural anthropology, archaeology, human geography, and sociology). Social scientific approaches to human vulnerability draw vital attention to the root causes of climate change threats and the reasons that people are forced to adapt to them. Because vulnerability is a multidimensional process rather than an unchanging state, a dynamic social approach to vulnerability is most likely to improve mitigation and adaptation planning efforts. This article is categorized under:Vulnerability and Adaptation to Climate Change > Values-Based Approach to Vulnerability and Adaptation.

Preliminary Analysis of a Modified Screening Tool to Increase the Frequency of Palliative Care Consults.

PURPOSE: Palliative care interventions have been shown to improve patient quality of life but the benefit may be less if interventions occur late in the patient's disease process. The objective of this study was to evaluate whether an objective screening tool could improve the frequency and timeliness of palliative care consultation. METHODS: Using a quasi-experimental design with 2 geographically separate medical intensive care units (MICUs), the control MICU continued existing consultation practice and the intervention MICU implemented a screening tool with each new admission. Any item checked on the screening tool triggered a palliative care consult within 24 hours of admission to the MICU. RESULTS: A total of 223 MICU admissions were evaluated: 156 patients in the control group and 67 patients in the intervention group. More consults were generated in the intervention group (22.39%) compared to the control group (7.05%; P < .001). The median time to consultation was lower in the intervention group compared to the control group (1 day vs 2 days; P < .01). CONCLUSION: Implementing a simple, objective screening tool increased palliative consultation rates and decreased median time to palliative consultation in our institution's MICU.

A Communications Bundle to Improve Satisfaction for Critically Ill Patients and Their Families: A Prospective, Cohort Pilot Study.

CONTEXT: Communication skills training with simulated patients is used by many academic centers, but how to translate skills learned in simulated settings to improve communication in real encounters has not been described. OBJECTIVES: We developed a communications bundle to facilitate skill transfer from simulation to real encounters and improve patient and/or family satisfaction with physician communication. We tested the feasibility of its use in our hospital's medical intensive care unit (MICU). METHODS: This prospective cohort 2-week feasibility study included patients admitted to the MICU with APACHE IV predicted mortality >30% and/or single organ failure. The communications bundle included simulation communication training for MICU physicians, scheduling a family meeting within 72 hours of MICU admission, standardized pre- and post-meeting team huddles with the aid of a mobile app to set an agenda, choose a communication goal, and get feedback, and documentation of meeting in the electronic medical record. The intervention group receiving the communications bundle was located in a geographically separate unit than the control group receiving standard of care from MICU physicians who had not received training in the communications bundle. Patient satisfaction surveys were given within 48 hours of the family meeting and scores compared between the two groups. We also compared trainee self-perceived communication preparation. RESULTS: The intervention group (N = 15) scored significantly higher on satisfaction than the control group (N = 16) (P = 0.018). Intervention group trainees reported improvement in self-perceived communication preparation. CONCLUSION: Use of the communications bundle proved feasible in the MICU and suggests association with improved patient satisfaction and trainee self-perception of communication preparedness.

Low Rate of Adverse Events Associated With Inpatient Parenteral Prostacyclins.

Parenteral prostacyclin is the most-effective therapy for patients with pulmonary arterial hypertension. Administration is complex, and administration errors are potentially life threatening. Hospital policies to minimize the risk to patients are necessary, but their effectiveness has not been well studied. We quantified the adverse event incident rate per at-risk patient day in a tertiary care hospital with an established parenteral prostacyclin policy. Patients on parenteral prostacyclin including new initiations from January 2003 to January 2013 were identified, encompassing 386 discrete admissions. Reports of adverse events were obtained from the inpatient risk feedback-reporting process and detailed chart review. Policy-divergent events were analyzed both categorically and by the degree of severity. Overall, 153 total policy-divergent events were identified. Data analysis indicated an incident rate of 45.9 per 1,000 patient days. In total, 21 of 153 potential errors reached the patient, translating to an incident rate of 6.3 per 1,000 patient days. Incident rate for "serious symptomatic" or "catastrophic" policy-divergent events was 3.3 per 1,000 patient days. Even with specific prostacyclin training and administration policy, there remains a small risk of adverse events in hospitalized pulmonary hypertension patients receiving parenteral prostacyclin.

Acute, chronic and biochemical effects of chlorothalonil on Agalychnis callidryas, Isthmohyla pseudopuma and Smilisca baudinii tadpoles.

Declines of amphibian populations have been a worldwide issue of concern for the scientific community during the last several decades. Efforts are being carried out to elucidate factors related to this phenomenon. Among these factors, pathogens, climate change, and environmental pollution have been suggested as possible causes. Regarding environmental pollutants, some pesticides are persistent in the environment and capable of being transported long distances from their release point. In Costa Rica, some pesticides have been detected in protected areas, at locations where amphibian populations have declined. Information about toxicity of pesticides used in Costa Rican agriculture to amphibians is still scarce, particularly for native species.Toxicity tests with chlorothalonil, a fungicide intensively used in Costa Rica, were carried out exposing tadpoles of three Costa Rican native species: Agalychnis callidryas, Isthmohyla pseudopuma, and Smilisca baudinii in order to evaluate acute and chronic toxicity as well as the biomarkers cholinesterase activity (ChE), glutathione-S transferase activity (GST), and lipid peroxidation (LPO).96-h LC50: 26.6 (18.9-35.8) µg/L to A. callidryas, 25.5 (21.3-29.7) µg/L to I pseudopuma and 32.3 (26.3-39.7) µg/L to S. baudinii were determined for chlorothalonil. These three species of anurans are among the most sensitive to chlorothalonil according to the literature. Besides, GST was induced in S. baudinii after exposure to sub-lethal concentrations of chlorothalonil while evisceration occurred in S. baudinii and A. callidryas tadpoles exposed to lethal concentrations of the fungicide. Chronic exposure to sub-lethal concentrations accelerated development in S. baudinii and caused lesions in tail of S. baudinii and I. pseudopuma tadpoles. Our results demonstrate that chlorothalonil is highly toxic to native amphibian species and that low concentrations can cause biochemical responses related to phase II of biotransformation and effects on development.

Impact of a Simulation-Based Communication Workshop on Resident Preparedness for End-of-Life Communication in the Intensive Care Unit.

Introduction. Although residents frequently lead end-of-life (EOL) discussions in the intensive care unit (ICU), training in EOL care during residency has been required only recently, and few educational interventions target EOL communication in the ICU. This study evaluated a simulation-based intervention designed to improve resident EOL communication skills with families in the ICU. Methods. Thirty-four second-year internal medicine residents at a large urban teaching hospital participated in small group sessions with faculty trained in the "VitalTalk" method. A Likert-type scale questionnaire measured self-assessed preparedness before, immediately following, and approximately 9 months after intervention. Data were analyzed using Wilcoxon rank-sum analysis. Results. Self-assessed preparedness significantly improved for all categories surveyed (preintervention mean; postintervention mean; p value), including discussing bad news (3.3; 4.2; p < 0.01), conducting a family conference (3.1; 4.1; p < 0.01), discussing treatment options (3.2; 3.9; p < 0.01), discussing discontinuing ICU treatments (2.9; 3.5; p < 0.01), and expressing empathy (3.9; 4.5; p < 0.01). Improvement persisted at follow-up for all items except "expressing empathy." Residents rated the educational quality highly. Conclusion. This study provides evidence that brief simulation-based interventions can produce lasting improvements in residents' confidence to discuss EOL care with family members of patients in the ICU.

A Two-Group Trial of a Terminal Ventilator Withdrawal Algorithm: Pilot Testing.

BACKGROUND: Terminal ventilator withdrawal entails cessation of mechanical ventilation to allow a natural death. There is little empirical evidence to guide the conduct of this procedure. If the process is not well conducted, patients undergoing terminal ventilator withdrawal are at high risk for experiencing significant respiratory distress. OBJECTIVES: Our aim was to (1) establish the feasibility of a nurse-led algorithmic approach; (2) determine differences in patient comfort between groups; and (3) determine differences in the use of opioids and benzodiazepines. METHODS: A prospective, two-group, repeated measures, observation design was used with nurses from one medical intensive care unit (MICU) conducting the algorithm and nurses from a second MICU providing unstandardized usual care. Patient respiratory comfort/distress was measured with the Respiratory Distress Observation Scale (RDOS). RESULTS: Nurses and respiratory therapists were trained to follow the algorithm in one-hour educational sessions; fidelity to the algorithm was subsequently confirmed. Fourteen patients evenly distributed by ethnicity and gender were enrolled, eight in the control MICU and six in the intervention unit. No significant differences in age, consciousness, illness severity, or baseline RDOS were found. All control patients underwent a one-step terminal extubation process. There were no incidences of post-extubation stridor in the intervention group, whereas three (38%) control patients experienced stridor. Patients in the intervention group had greater respiratory comfort compared with control patients (p<0.05). Differences in medication use were found with lorazepam favored in the control unit; morphine is recommended in the algorithm. CONCLUSIONS: Feasibility and proof of concept for the nurse-led algorithm were established.

Predischarge bundle for patients with acute exacerbations of COPD to reduce readmissions and ED visits: a randomized controlled trial.

BACKGROUND: Hospital readmissions for acute exacerbations of COPD (AECOPDs) pose burdens to the health-care system and patients. A current gap in knowledge is whether a predischarge screening and educational tool administered to patients with COPD reduces readmissions and ED visits. METHODS: A single-center, randomized trial of admitted patients with AECOPDs was conducted at Henry Ford Hospital between February 2010 and April 2013. One hundred seventy-two patients were randomized to either the control (standard care) or the bundle group in which patients received smoking cessation counseling, screening for gastroesophageal reflux disease and depression or anxiety, standardized inhaler education, and a 48-h postdischarge telephone call. The primary end point was the difference in the composite risk of hospitalizations or ED visits for AECOPD between the two groups in the 30 days following discharge. A secondary end point was 90-day readmission rate. RESULTS: Of the 172 patients, 18 of 79 in the control group (22.78%) and 18 of 93 in the bundle group (19.35%) were readmitted within 30 days. The risk of ED visits or hospitalizations within 30 days was not different between the groups (risk difference, -3.43%; 95% CI, -15.68% to 8.82%; P = .58). Overall, the time to readmission in 30 and 90 days was similar between groups (log-rank test P = .71 and .88, respectively). CONCLUSIONS: A predischarge bundle intervention in AECOPD is not sufficient to reduce the 30-day risk of hospitalizations or ED visits. More resources may be needed to generate a measurable effect on readmission rates. TRIAL REGISTRY: ClinicalTrials.gov; No.: NCT02135744; URL: www.clinicaltrials.gov.

Model Point-of-Care Ultrasound Curriculum in an Intensive Care Unit Fellowship Program and Its Impact on Patient Management.

Objectives. This study was designed to assess the clinical applicability of a Point-of-Care (POC) ultrasound curriculum into an intensive care unit (ICU) fellowship program and its impact on patient care. Methods. A POC ultrasound curriculum for the surgical ICU (SICU) fellowship was designed and implemented in an urban, academic tertiary care center. It included 30 hours of didactics and hands-on training on models. Minimum requirement for each ICU fellow was to perform 25-50 exams on respective systems or organs for a total not less than 125 studies on ICU. The ICU fellows implemented the POC ultrasound curriculum into their daily practice in managing ICU patients, under supervision from ICU staff physicians, who were instructors in POC ultrasound. Impact on patient care including finding a new diagnosis or change in patient management was reviewed over a period of one academic year. Results. 873 POC ultrasound studies in 203 patients admitted to the surgical ICU were reviewed for analysis. All studies included were done through the POC ultrasound curriculum training. The most common exams performed were 379 lung/pleural exams, 239 focused echocardiography and hemodynamic exams, and 237 abdominal exams. New diagnosis was found in 65.52% of cases (95% CI 0.590, 0.720). Changes in patient management were found in 36.95% of cases (95% CI 0.303, 0.435). Conclusions. Implementation of POC ultrasound in the ICU with a structured fellowship curriculum was associated with an increase in new diagnosis in about 2/3 and change in management in over 1/3 of ICU patients studied.

Evolution of acyl-ACP-thioesterases and ß-ketoacyl-ACP-synthases revealed by protein-protein interactions.

The fatty acid synthase (FAS) is a conserved primary metabolic enzyme complex capable of tolerating cross-species engineering of domains for the development of modified and overproduced fatty acids. In eukaryotes, acyl-acyl carrier protein thioesterases (TEs) off-load mature cargo from the acyl carrier protein (ACP), and plants have developed TEs for short/medium-chain fatty acids. We showed that engineering plant TEs into the green microalga Chlamydomonas reinhardtii does not result in the predicted shift in fatty acid profile. Since fatty acid biosynthesis relies on substrate recognition and protein-protein interactions between the ACP and its partner enzymes, we hypothesized that plant TEs and algal ACP do not functionally interact. Phylogenetic analysis revealed major evolutionary differences between FAS enzymes, including TEs and ketoacyl synthases (KSs), in which the former is present only in some species, whereas the latter is present in all, and has a common ancestor. In line with these results, TEs appeared to be selective towards their ACP partners whereas KSs showed promiscuous behavior across bacterial, plant and algal species. Based on phylogenetic analyses, in silico docking, in vitro mechanistic crosslinking and in vivo algal engineering, we propose that phylogeny can predict effective interactions between ACPs and partner enzymes.

Dedicated multidisciplinary ventilator bundle team and compliance with sedation vacation.

BACKGROUND: How compliance with a ventilator bundle is monitored varies from institution to institution. Some institutions rely on the primary intensive care unit team to review the bundle during their rounds; others rely on a separate team of health care personnel that may include representatives from disciplines such as nursing, respiratory therapy, and pharmacy. OBJECTIVES: To compare rates of compliance with ventilator bundle components between a dedicated ventilator bundle rounding team and the primary intensive care unit rounding team in a 68-bed medical intensive care unit. METHODS: A query of the medical intensive care unit's database was used to retrospectively determine rates of compliance with specific ventilator bundle components at a tertiary care hospital in an urban community for 1 year. RESULTS: Compared with the intensive care unit rounding team, the ventilator bundle rounding team had better compliance with sedation vacation (61.7% vs 54.0%, P < .001). Rates of compliance with spontaneous breathing trials and prophylaxis of peptic ulcer disease were similar in both study groups. CONCLUSIONS: A dedicated ventilator bundle rounding team improves compliance with sedation vacation, but not with spontaneous breathing trials and prophylaxis of peptic ulcer disease. In a large-volume tertiary center, a dedicated ventilator bundle rounding team may be more effective than the primary rounding team in achieving compliance with some bundle components.

Manipulating fatty acid biosynthesis in microalgae for biofuel through protein-protein interactions.

Microalgae are a promising feedstock for renewable fuels, and algal metabolic engineering can lead to crop improvement, thus accelerating the development of commercially viable biodiesel production from algae biomass. We demonstrate that protein-protein interactions between the fatty acid acyl carrier protein (ACP) and thioesterase (TE) govern fatty acid hydrolysis within the algal chloroplast. Using green microalga Chlamydomonas reinhardtii (Cr) as a model, a structural simulation of docking CrACP to CrTE identifies a protein-protein recognition surface between the two domains. A virtual screen reveals plant TEs with similar in silico binding to CrACP. Employing an activity-based crosslinking probe designed to selectively trap transient protein-protein interactions between the TE and ACP, we demonstrate in vitro that CrTE must functionally interact with CrACP to release fatty acids, while TEs of vascular plants show no mechanistic crosslinking to CrACP. This is recapitulated in vivo, where overproduction of the endogenous CrTE increased levels of short-chain fatty acids and engineering plant TEs into the C. reinhardtii chloroplast did not alter the fatty acid profile. These findings highlight the critical role of protein-protein interactions in manipulating fatty acid biosynthesis for algae biofuel engineering as illuminated by activity-based probes.

Robust expression and secretion of Xylanase1 in Chlamydomonas reinhardtii by fusion to a selection gene and processing with the FMDV 2A peptide.

Microalgae have recently received attention as a potential low-cost host for the production of recombinant proteins and novel metabolites. However, a major obstacle to the development of algae as an industrial platform has been the poor expression of heterologous genes from the nuclear genome. Here we describe a nuclear expression strategy using the foot-and-mouth-disease-virus 2A self-cleavage peptide to transcriptionally fuse heterologous gene expression to antibiotic resistance in Chlamydomonas reinhardtii. We demonstrate that strains transformed with ble-2A-GFP are zeocin-resistant and accumulate high levels of GFP that is properly 'cleaved' at the FMDV 2A peptide resulting in monomeric, cytosolic GFP that is easily detectable by in-gel fluorescence analysis or fluorescent microscopy. Furthermore, we used our ble2A nuclear expression vector to engineer the heterologous expression of the industrial enzyme, xylanase. We demonstrate that linking xyn1 expression to ble2A expression on the same open reading frame led to a dramatic (~100-fold) increase in xylanase activity in cells lysates compared to the unlinked construct. Finally, by inserting an endogenous secretion signal between the ble2A and xyn1 coding regions, we were able to target monomeric xylanase for secretion. The novel microalgae nuclear expression strategy described here enables the selection of transgenic lines that are efficiently expressing the heterologous gene-of-interest and should prove valuable for basic research as well as algal biotechnology.