Narcosis and Asphyxiation in Some Species and Mutants of Drosophila

1942 ◽  
Vol 19 (3) ◽  
pp. 238-254
Author(s):  
HANS KALMUS
Keyword(s):  
Carbon Dioxide ◽  
Recovery Time ◽  
Hydrocyanic Acid ◽  
Physiological Factors ◽  
Acid Gas ◽  
Recovery Curves ◽  
Straight Line ◽  
Recovery Times ◽  
Quantitative Results ◽  
Different Parts

1. Narcosis and asphyxia in insects can be investigated by measuring the recovery time. This and other terms are defined, and suitable criteria of recovery are given. 2. Simple techniques for the etherizing and gassing of Drosophila batches are described and the validity of the quantitative results obtained is shown. 3. The recovery time is increased by the time of influx and by the concentration of the narcotic. The shapes of the curves obtained in experimental series are logarithmic (carbon dioxide asphyxiation), straight line (ether in some species), concave, convex or sigmoid (ether). It is suggested that the different forms of ether recovery curves are different parts of essentially similar curves, which one might explain by the joint action of two macrophases, one aqueous and one lipoid. 4. Physiological factors determining recovery times are: (a) sex: females recover earlier from ether narcosis than males; (b) age: young flies recover earlier than older ones; (c) lack of food and moisture, which increases the recovery timè; and (d) chemical reaction: flies kept on acid food remain longer narcotized than flies bred on an alkaline medium. 5. Carbon dioxide lengthens recovery from ether narcosis and hydrocyanic acid immobilization when applied before the influx time and shortens it when applied during recovery time. If administered during recovery, it also shortens the recovery from asphyxiation. 6. Carbon monoxide and coal gas administered before narcotization can shorten the recovery time from ether narcosis. 7. Under specified conditions corresponding to those, used during narcosis by Drosophila-workers some differences in recovery time after etherization due to genetical differences could be established. Significant differences also exist between some Drosophila species, races and mutants in their resistance to carbon dioxide, asphyxiation and hydrocyanic acid gas.

Recovery of ectomycorrhizal fungi after exposure to subfreezing temperatures

1979 ◽  
Vol 57 (17) ◽  
pp. 1845-1848 ◽  
Author(s):  
R. C. France ◽  
M. L. Cline ◽  
C. P. P. Reid
Keyword(s):  
Growth Rate ◽  
Ectomycorrhizal Fungi ◽  
Recovery Time ◽  
Growth Form ◽  
Rapid Recovery ◽  
Active Growth ◽  
Growth Recovery ◽  
Recovery Times

Seventy-three isolates of eighteen ectomycorrhizal fungi were examined for their growth recovery after a 48-h exposure to −10 °C. Survival of all isolates was 97%. Recovery time to active growth varied between species and within species. Of surviving isolates, 72% initiated growth in less than 2 weeks after thawing. Growth rate was not affected for isolates exhibiting rapid recovery but was significantly lowered for isolates with recovery times of more than 5 weeks. Variation in growth form occurred with some species of Suillus and Xerocomus.

Carbon Emission Reduction via HNGLRP CC&S Technology

2021 ◽  
Author(s):  
Sultan Ahmari ◽  
Abdullatef Mufti
Keyword(s):  
Carbon Dioxide ◽  
Oil Recovery ◽  
Water Reuse ◽  
Carbon Emission ◽  
Ventilation System ◽  
Acid Gas ◽  
Gas Removal ◽  
Saudi Aramco ◽  
Supercritical Phase ◽  
Incineration Process

Abstract The paper objective is to present the successful achievement by Saudi Aramco gas operations to reduce the carbon emission at Hawyiah NGL Recovery Plant (HNGLRP) after successful operation & maintainability of the newly state of the art Carbon Capture & Sequestration (CC&S) technology. This is in line with the Kingdom of Saudi Arabia (KSA) 2030 vision to increase the resources sustainability for future growth and part of Saudi Aramco circular economy in action examples. Saudi Aramco CC&S started in June 2015 at HNGLRP with main objective to capture the carbon dioxide (CO2) from Acid Gas Removal Units (AGRUs) and then inject an annual mass of nearly 750 Kton of carbon dioxide into oil wells for sequestration and enhanced oil recovery maintainability. This is to replace the typical acid gas incineration process after AGRUs operation to reduce carbon footprint. CC&S consists of the followings: integrally geared multistage compressor, standalone dehydration system using Tri-Ethylene Glycol (TEG), CO2 vapor recovery unit (VRU), Granulated Activated Carbon (GAC) to treat water generated from compression and dehydration systems for reuse purpose, and special dense phase pump that transfers the dehydrated CO2 at supercritical phase through 85 km pipeline to replace the typical sea water injection methodology in enhancing oil recovery. CC&S has several new technologies and experiences represented by the compressor capacity, supercritical phase fluid pumping, using mechanical ejector application to maximize carbon recovery, and CO2/TEG dehydration system as non-typical dehydration system. CC&S design considered the occupational health hazards generated from the compressor operation by installing engineering enclosure with proper ventilation system to minimize the noise hazard. CC&S helped HNGLRP to reduce the overall Greenhouse Gas (GHG) emission resulted from typical CO2 incineration process (thermal oxidizing). (2) The total GHG resulted from combustion sources at HNGLRP reduced by nearly 30% since CC&S technology in operation. The fuel gas consumption to run the thermal oxidizers in AGRUs reduced by 75% and sent as sales gas instead. The Energy Intensity Index (EII) reduced by 8% since 2015, water reuse index (WRI) increased by 12%. In conclusion, the project shows significant reduction in the carbon emission, noticeable increase in the production, and considerable water reuse.

scholarly journals 14C Dating of Laser-Oxidized Organics

Radiocarbon ◽  
1993 ◽  
Vol 35 (2) ◽  
pp. 331-333 ◽  
Author(s):  
A. L. Watchman ◽  
R. A. Lessard ◽  
A. J. T. Jull ◽  
L. J. Toolin ◽  
Weston Blake
Keyword(s):  
Mass Spectrometry ◽  
Carbon Dioxide ◽  
Accelerator Mass Spectrometry ◽  
14C Dating ◽  
Ion Laser ◽  
Different Parts

We used a continuous krypton ion laser to rapidly oxidize milligram-sized fragments of coniferous driftwood of known ages, and dated the resulting carbon dioxide by accelerator mass spectrometry (AMS). AMS 14C ages of non-pretreated young wood from different parts of two logs were within 10% of the ages of conventionally determined alkaline insoluble fractions. The age of the oldest whole wood measured after laser oxidation was within the error ranges of conventional values.

Using Acute Performance on a Comprehensive Neurocognitive, Vestibular, and Ocular Motor Assessment Battery to Predict Recovery Duration After Sport-Related Concussions

2017 ◽  
Vol 45 (5) ◽  
pp. 1187-1194 ◽  
Author(s):  
Alicia M. Sufrinko ◽  
Gregory F. Marchetti ◽  
Paul E. Cohen ◽  
R.J. Elbin ◽  
Valentina Re ◽  
...  
Keyword(s):  
Recovery Time ◽  
Symptom Assessment ◽  
Cognitive Testing ◽  
Ocular Motor ◽  
Motor Speed ◽  
Multinomial Regression ◽  
Symptom Scale ◽  
Level Of Evidence ◽  
Recovery Times ◽  
Visual Motor

Background: A sport-related concussion (SRC) is a heterogeneous injury that requires a multifaceted and comprehensive approach for diagnosis and management, including symptom reports, vestibular/ocular motor assessments, and neurocognitive testing. Purpose: To determine which acute (eg, within 7 days) vestibular, ocular motor, neurocognitive, and symptom impairments predict the duration of recovery after an SRC. Study Design: Cohort study (prognosis); Level of evidence, 2. Methods: Sixty-nine patients with a mean age of 15.3 ± 1.9 years completed a neurocognitive, vestibular/ocular motor, and symptom assessment within 7 days of a diagnosed concussion. Patients were grouped by recovery time: ≤14 days (n = 27, 39.1%), 15-29 days (n = 25, 36.2%), and 30-90 days (n = 17, 24.6%). Multinomial regression was used to identify the best subset of predictors associated with prolonged recovery relative to ≤14 days. Results: Acute visual motor speed and cognitive-migraine-fatigue symptoms were associated with an increased likelihood of recovery times of 30-90 days and 15-29 days relative to a recovery time of ≤14 days. A model with visual motor speed and cognitive-migraine-fatigue symptoms within the first 7 days of an SRC was 87% accurate at identifying patients with a recovery time of 30-90 days. Conclusion: The current study identified cognitive-migraine-fatigue symptoms and visual motor speed as the most robust predictors of protracted recovery after an SRC according to the Post-concussion Symptom Scale, Immediate Post-concussion Assessment and Cognitive Testing, and Vestibular/Ocular Motor Screening (VOMS). While VOMS components were sensitive in identifying a concussion, they were not robust predictors for recovery. Clinicians may consider particular patterns of performance on clinical measures when providing treatment recommendations and discussing anticipated recovery with patients.

The Effect of Hydrocyanic Acid Gas upon Grains and Other Seeds

1901 ◽  
Vol 31 (4) ◽  
pp. 241-264 ◽  
Author(s):  
C. O. Townsend
Keyword(s):  
Hydrocyanic Acid ◽  
Acid Gas

scholarly journals THE RELATIONSHIP BETWEEN MENTAL HEALTH HISTORY AND SYMPTOMS, SEX, AND RECOVERY TIME IN A CONCUSSED PEDIATRIC POPULATION

2020 ◽  
Vol 8 (4_suppl3) ◽  
pp. 2325967120S0023
Author(s):  
Richard Cameron Allred ◽  
Sara Stremlau ◽  
Richard Gerkin ◽  
Steven Erickson ◽  
Jamie Pardini
Keyword(s):  
Mental Health ◽  
Mental Illness ◽  
Recovery Time ◽  
Pediatric Population ◽  
Return To Play ◽  
Depression Symptoms ◽  
Health History ◽  
Mental Health History ◽  
Recovery Times ◽  
History Of

Background: The Generalized Anxiety Disorder scale (GAD-7) and Patient Health Questionnaire (PHQ-9) are mental health screening instruments that assess symptoms of depression and anxiety. Studies of patients with concussion suggest that history of mental illness is associated with prolonged recovery; however, little research has examined the value of these tools in a concussed pediatric population (Iverson et al., 2017). Hypothesis/Purpose: The purpose of this study was to explore the relation between anxiety and depression symptoms, mental illness history, sex, and time to recover in a concussed pediatric population. We hypothesized that mental health symptoms and history, and female sex would predict longer recoveries in the pediatric population. Methods: IRB-approved retrospective chart review was used for data collection. Demographics, self-reported mental health history, GAD-7, and PHQ-9 scores were acquired for 250 adolescents ages 12-18 (45.2% female) who presented to an outpatient concussion clinic for their initial visit. Days to recover was imputed for all patients who had been discharged by clinic physicians based on international return to play standards. Results: Mann-Whitney U tests were used for analysis of this nonnormally distributed data. Males were found to recover more quickly than females (female median = 15 days, IQR 7-27; male median = 12 days, IQR 6-23; p=.013). No significant differences were observed in days to clearance based on reported history of mental health disorder (p=.066). Individuals who scored above cutoff (see Kroenke et al., 2001; Spitzer et al., 2006) on the GAD-7 (below cutoff median = 12.00 days; above cutoff median = 21.00 days) and PHQ-9 (below cutoff median = 23.5 days; above cutoff median = 57.00 days) required longer recovery times (p <.001). Conclusion: We found longer recovery times in females versus males, and in those whose scores fell above cutoff for the PHQ-9 and GAD-7 at their initial clinic visit. Although a trend existed, there were no significant differences in recovery time for those who reported a mental health history compared to those who did not. Results suggest that the GAD-7 and PHQ-9 may be useful screening measures in a concussion clinic and may provide additional insight into potential recovery times for pediatric patients.

scholarly journals Comparing Acute Symptoms and Recovery Time Following Sports-Related Concussion Across School Age Groups

2019 ◽  
Vol 34 (5) ◽  
pp. 774-774
Author(s):  
T Tarkenton ◽  
C Presley ◽  
N Didehbani ◽  
C H Silver ◽  
C M Cullum
Keyword(s):  
High School ◽  
Recovery Time ◽  
Age Groups ◽  
School Age ◽  
Early Elementary ◽  
General Anxiety Disorder ◽  
General Anxiety ◽  
The North ◽  
Severity Scores ◽  
Recovery Times

Abstract Purpose Despite considerable research on pediatric sports-related concussion (SRC), few studies have analyzed groups from school-age through young adulthood. This study aimed to examine acute symptoms (i.e., emotional, physical, and cognitive) and recovery times across this age range. Methods Participants age 5–25 with SRC (n=611) presented to concussion clinics in the North Texas Concussion Registry within 2 weeks of injury. Subjects were stratified into 4 age groups: early elementary (age 5-9; n=19), late elementary (10–13; n=181), high school (14-17; n=384), and college (18-25; n=39). The Patient Health Questionnaire-9 (PHQ-9), General Anxiety Disorder-7 Item Scale (GAD-7), and concussion symptom log (Sx log), were administered. ANOVA was used to compare symptom scores and recovery times across groups. Results Differences were found on PHQ-9 scores (p=.05), with the early elementary and high school groups reporting significantly higher levels of depressive symptoms than the late elementary and college groups. No differences were seen on GAD-7 scores. Differences in Sx log severity scores were nonsignificant (p=.09), although scores increased with age (early: M=21.4, late=25.7, high school=30.0, college=35.5). Lastly, recovery time differed across groups (p=.008), with early elementary participants having the longest recovery (M=8.3 days) and the college group having the shortest (M=5.1 days). Conclusion Older age groups reported higher levels of acute post-concussion symptoms and more rapid recovery compared to younger age groups, suggesting that symptomatology and recovery time vary developmentally and the effects of age warrant consideration in young athletes.

Sign in / Sign up

Export Citation Format

Share Document