Documentation of landoltia (Landoltia punctata) resistance to diquat

Weed Science ◽  
2006 ◽  
Vol 54 (4) ◽  
pp. 615-619 ◽  
Author(s):  
Tyler J. Koschnick ◽  
William T. Haller ◽  
Les Glasgow
Keyword(s):  
Aquatic Plant ◽  
Resistance Mechanism ◽  
Photosynthetic Electron Transport ◽  
Prior History ◽  
Ion Leakage ◽  
Lake County ◽  
Static Tests ◽  
The Past ◽  
History Of ◽  
New Formulation

Landoltia was collected and cultured from a canal in Lake County, Florida, where diquat was used repeatedly during the past 20–30 yr for duckweed control. Recent applications of diquat failed to provide adequate control of duckweed, and a new commercial formulation of diquat was suspected. The new formulation was not the cause of reduced efficacy. Static exposures (48 h) to various concentrations of diquat were used to compare the susceptibility of the Lake County landoltia accession to one never exposed to diquat. These static tests indicated that landoltia, from a population with no prior history of herbicide treatment, was extremely susceptible to diquat. The accession from Lake County, FL had developed resistance to diquat, and was also cross resistant to paraquat. The resistance factor was 50 for diquat and 29 for paraquat. The Lake County accession also exhibited reduced ion leakage after diquat exposure under light and dark conditions. This suggests the resistance mechanism to the bipyridylium herbicides in landoltia is independent of photosynthetic electron transport. This research documents the first aquatic plant species that has developed resistance to the bipyridylium herbicides.

Saltation and suspension trajectories of solid grains in a water stream

1977 ◽  
Vol 284 (1321) ◽  
pp. 225-254 ◽  
Keyword(s):  
Velocity Gradient ◽  
High Speed ◽  
Prior History ◽  
Water Stream ◽  
The Past ◽  
The Coefficient Of Friction ◽  
Conservation Of Momentum ◽  
History Of ◽  
The Mean ◽  
Exposure Technique

This paper continues the investigation of the motion of solitary grains in a water stream, reported by Francis (1973)- The trajectories of solid grains are photographed by a multi-exposure technique as they are propelled by water streams along the bed of a laboratory channel. Many thousands of photographs were taken and analysed to determine the positions, velocities and accelerations of the grain. The technique does not take into account the possible effect, in multi-grain transport, of intergranular collisions. The three different modes of transport of grains were all observed — rolling, saltation and suspension, and the proportion of each found for a variety of transport stage w*/w*0. The development of suspension is much less rapid than the development of saltation from rolling, but even at the highest stage used, about 3.0, there is still a small amount of rolling. The trajectory dimensions and geometry are shown in relation to the stage which uniquely determines the geometry. Experiments where the grain is suddenly entrained from a stationary position show that several features of the subsequent trajectory are the same as those of a trajectory with a prior history of movement: thus it is inferred that the start of a trajectory is by way of hydrodynamic forces rather than by the conservation of momentum of previous trajectories. Impacts and trajectories were analysed for the coefficient of friction tan cc and for the height of the effective thrust. While tan a is shown to be rather larger than has been suspected in the past, the variation of yn throws light upon predominance of slow fluid near the bed rather than high speed inrushes of fast fluid. Better information is now available for finding the mean forward speed of grains compared to that presented in the earlier paper. There are grounds for believing the existence of a * shear-drift ’ force on grains when they are in a velocity gradient, giving a force opposing gravity: but there is no evidence of a proximity effect of the bed independent of the velocity gradient.

Is It Traditional?

1999 ◽  
pp. 55-79
Author(s):  
Louis Jacobs
Keyword(s):  
The Real ◽  
The Past ◽  
Critical Method ◽  
History Of ◽  
Liberal Approach ◽  
New Formulation

This chapter considers in greater detail how the historical critical method sheds light on the term “from” and whether the position can be considered to be in any way traditional. It talks about the doctrine that the Torah is from Heaven, emphasizing that every word of the Pentateuch, the Five Books of Moses, was communicated directly by God to Moses during the forty years the Children of Israel journeyed through the wilderness. This demonstrates that there are faint glimmerings in talmudic statements that enable non-fundamentalists to claim new theological formulations. The point of quoting talmudic and similar references from the past is to show how much more flexible the rabbis were in matters of dogma than whose stark formulation is often hurled against the legitimacy of the “liberal” approach. What is involved in any new formulation of dogma is a greater awareness of the real history of Judaism.

scholarly journals Thyroid gossypiboma: a rare diagnosis with common presentation

2019 ◽  
Vol 6 (9) ◽  
pp. 3409
Author(s):  
Kush Raj Lohani ◽  
Kamal Kataria ◽  
Piyush Ranjan ◽  
Sarada Khadka ◽  
Jnaneshwari Jayaram
Keyword(s):  
Needle Aspiration ◽  
Working Environment ◽  
Prior History ◽  
Time Interval ◽  
The Past ◽  
Primary Surgery ◽  
High Clinical Suspicion ◽  
Thyroid Abscess ◽  
History Of ◽  
Surgery First

Gossypiboma is a surgical negligence and is commonly reported in major abdominal surgeries. It has rarely been reported after thyroid surgeries. We present gossypibomas found in two post-hemithyroidectomy patients who presented differently and at varied time interval after primary surgery. First patient is a middle-aged lady who presented with persistent discharging sinus from neck for the past 4 years. She underwent hemithyroidectomy in the past. Another patient is an elderly lady who presented with lump in the neck for the past 3 months. She also had history of thyroid surgery about 36 years back. With the working diagnosis of thyroid abscess and malignancy in the respective cases, extensive work up was done including imaging and needle aspiration. However, definitive diagnosis could only be made intra-operatively, where gauze piece was found embedded in the prior surgical site. Gossypibomas can present in a varied fashion that can be easily missed from clinical judgement and imaging. High clinical suspicion in patients with prior history of surgery presenting with chronic discharging sinus or lump is key to diagnosing gossypibomas. Safer working environment with safety checkpoints are warranted to avoiding such incidences.

scholarly journals 1494. Clinical Factors Associated with a Positive C. difficile PCR Test

2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S544-S544
Author(s):  
Teresa Cushman ◽  
Michelle Barron ◽  
Jaron Arbet ◽  
Rachel Weber ◽  
Yaxu Zhuang ◽  
...  
Keyword(s):  
Hospital Length Of Stay ◽  
Positive Test ◽  
Prior History ◽  
Antibiotic Administration ◽  
Clinical Factors ◽  
Factors Associated ◽  
The Past ◽  
Test Order ◽  
History Of ◽  
Pcr Test

Abstract Background C. difficile infection (CDI) remains a significant cause of morbidity and mortality. The most appropriate clinical scenario for CDI testing is unclear. The IDSA/SHEA guideline recommends testing patients with unexplained new-onset ≥3 stools in 24 hours. This study sought to evaluate clinical factors associated with a positive C. difficile PCR test. Methods We conducted a retrospective cohort study of adults (age >18 years old) admitted to the University of Colorado Hospital for whom a C. difficile PCR, either as a standalone test or part of the Biofire® Filmarray® Gastrointestinal Panel (GI Panel), was ordered between October 1, 2015 and August 31, 2017. Data collected included time since admission to test order, hospital length of stay, history of CDI, antibiotic use in the past 90 days, clinical presentation in the 24 hours preceding test order (fever, leukocytosis, number of stools), and laxative or antibiotic administration within 24 hours of test order. Multivariate logistic regression was used to evaluate the association of the above variables with having a positive C. difficile PCR test. If multiple tests were ordered during a single hospital encounter, only the first test was included in our analysis. Results 3,070 tests were performed; of these, 72% were ordered in the first 72 hours of admission. Overall, 19% of tests were positive. After adjusting for clinical variables, patients with a prior history of C. difficile or who had received antibiotics in the past 24 hours were significantly more likely to have a positive test [OR 2.2 95% CI (1.54, 3.18) P < 0.0001] and [OR 16 95% CI (8.22, 31.41) P < 0.0001], respectively. Patients who used laxatives were significantly less likely to have a positive test [OR 0.75 95% CI (0.61, 0.91) P = 0.004]. The number of stools and presence of fever or leukocytosis were not significantly associated with a positive test. Conclusion Prior history of C. difficile and antibiotics use was highly associated with a positive C. difficile test, while laxatives use was associated with a negative test. The number of stools was not significantly associated with a positive C. difficile test, suggesting this may be less important clinical factor than previously believed; however, restricting testing in patients receiving laxatives is likely warranted. Disclosures All authors: No reported disclosures.

scholarly journals A Unique Case of Testicular Compromise in a Patient with Ovotesticular Disorder of Sexual Development and a Solitary Testicle

2017 ◽  
Vol 2017 ◽  
pp. 1-3
Author(s):  
Ethan Vargo ◽  
Lillianne Stanitsas ◽  
Mark Memo
Keyword(s):  
Sexual Development ◽  
Ovarian Tissue ◽  
Prior History ◽  
Unique Case ◽  
The Past ◽  
Vascular Flow ◽  
Disorder Of Sexual Development ◽  
Increased Risk ◽  
History Of

Ovotesticular disorder of sexual development (OT-DSD), previously true hermaphroditism, is a condition in which one or both gonads contain testicular and ovarian tissue. A 23-year-old OT-DSD male patient presented with continuous pain in his right testicle which had been previously intermittent over the past five days. The patient had a prior history of left ovotestis removal with prosthesis placement, a right undescended testicle with aberrant anatomy, and hypospadias repair, all of which were corrected shortly after birth. A lack of blood flow to the testicle on Doppler ultrasound warranted immediate surgical intervention. Intraoperatively, an aberrant tunica vaginalis space with a compressive hematoma secondary to epididymal abscess rupture was identified as the causation for testicular compromise. Return of vascular flow to the testicle was confirmed with intraoperative Doppler after hematoma and epididymis excision, and the testicle was left in situ. It is imperative to consider epididymal etiologies with acute testicular pain, especially in a patient with a medical history that carries an increased risk for gonadal anomalies.

scholarly journals Rapidly Fatal COVID-19-associated Acute Necrotizing Encephalopathy in a Previously Healthy 26-year-old Man

2021 ◽  
Vol 23 (5) ◽  
pp. 138-143
Author(s):  
Robert Raschke ◽  
◽  
Cristan Jivcu
Keyword(s):  
Prior History ◽  
Significant Past Medical History ◽  
Acute Necrotizing Encephalopathy ◽  
The Past ◽  
Progressive Dyspnea ◽  
Chief Complaints ◽  
Acute Necrotizing ◽  
History Of ◽  
Oropharyngeal Swab ◽  
To Receive

No abstract available. Article truncated after 150 words. A 26-year-old man presented to our Emergency Department at 0200 on the day of admission with chief complaints of subjective fever, leg myalgias, and progressive dyspnea of one week duration. An oropharyngeal swab PCR had revealed SARS-CoV-2 RNA three days previously. He had not received a SARS CoV-2 vaccination, but had made an appointment to receive it just a few days prior to the onset of his symptoms. The patient had no significant past medical history, was taking no medications except for ibuprofen and acetaminophen over the past week, and did not take recreational drugs. He specifically denied headache and had no prior history of seizure. On admission, his HR was 150 bpm (sinus), RR 22, BP 105/46 mmHg, temp 40.2° C. and SpO2 92% on room air. He was ill-appearing, but alert and oriented, his neck was supple and lung auscultation revealed bilateral rhonchi, but physical examination was otherwise …

Predicting Future Intimate Partner Violence with Past Intimate Partner Violence: The Moderating Role of Proactive and Reactive Criminal Thinking

2020 ◽  
Vol 47 (8) ◽  
pp. 943-955
Author(s):  
Glenn D. Walters
Keyword(s):  
Intimate Partner Violence ◽  
Partner Violence ◽  
Intimate Partner ◽  
Health Concern ◽  
Prior History ◽  
Criminal Thinking ◽  
The Past ◽  
Mediated Effects ◽  
History Of

Intimate partner violence (IPV) is a major public health concern with serious consequences for individuals, families, and society in general. In an effort to expand knowledge in this area, this study assessed whether proactive (planned, calculated, amoral) and reactive (impulsive, irresponsible, emotional) criminal thinking mediated or moderated the past IPV–future IPV relationship in 1,238 individuals released from federal prison. Evaluating the indirect effect of past IPV on future IPV via proactive and reactive criminal thinking failed to produce any significant mediated effects. There was evidence, however, of a moderating effect for proactive criminal thinking, such that prior IPV predicted subsequent IPV recidivism only when proactive criminal thinking was elevated. Reactive criminal thinking, by contrast, failed to moderate the past IPV–future IPV relationship. These findings suggest that proactive criminal thinking may serve as a risk factor for future IPV in individuals with a prior history of domestic violence.

A High-Grade Primary Leiomyosarcoma of the Bladder in a Survivor of Retinoblastoma

2001 ◽  
Vol 125 (9) ◽  
pp. 1231-1234
Author(s):  
Sharon X. Liang ◽  
Yegappan Lakshmanan ◽  
Bruce A. Woda ◽  
Zhong Jiang
Keyword(s):  
Soft Tissue ◽  
Urinary Bladder ◽  
Soft Tissue Sarcomas ◽  
Common Type ◽  
Prior History ◽  
Adjuvant Radiation ◽  
High Grade ◽  
Cyclophosphamide Therapy ◽  
The Past ◽  
History Of

Abstract Second nonocular malignancies develop with increased incidence in patients with hereditary retinoblastoma. Osteosarcoma is by far the most common type with an incidence of up to 50%, followed by soft tissue sarcomas. Visceral leiomyosarcoma is extremely rare and only 2 cases have been reported in the past 2 decades, one in the liver and another one in the urinary bladder, both of which developed after cyclophosphamide therapy. Here we report a case of vesical leiomyosarcoma that was diagnosed in a 49-year-old woman 47 years after the diagnosis of a hereditary retinoblastoma. The patient's retinoblastoma was treated with unilateral enucleation without adjuvant radiation or chemotherapy. We believe that this is the first report of vesical leiomyosarcoma occurring in a patient with retinoblastoma without a prior history of radiation or chemotherapy. This report is significant not only because of the rarity of vesical leiomyosarcoma as a second nonocular tumor in retinoblastoma patients, but also because of the infrequency of vesical leiomyosarcoma in general. We also investigated the potential molecular pathogenesis of the leiomyosarcoma.

Violent Incidents in an Adolescent Forensic Unit

1995 ◽  
Vol 35 (2) ◽  
pp. 150-158 ◽  
Author(s):  
M Kelsall ◽  
M Dolan ◽  
S Bailey
Keyword(s):  
Young People ◽  
Prior History ◽  
Violent Behaviour ◽  
The Past ◽  
Psychiatric Institutions ◽  
Secure Environment ◽  
Adolescent Groups ◽  
History Of ◽  
Self Harm ◽  
Incident Rate

Violent incidents in psychiatric institutions have been the focus of much study over the past few decades. But there has been little work looking at similar incidents in child and adolescent units. The authors set out to examine whether some of the patterns observed in adult populations are true of adolescent groups. The Gardener Unit was considered appropriate in light of reports of a higher frequency of assaultative behaviour among younger clients and because of the nature of problems presented by clients needing a secure environment. All violent incidents are automatically recorded. The violent incident register was examined between 1 June 1991 and 1 June 1992 and the information cross-checked with case notes and nursing reports. Demographic details, etc. were obtained from case notes. The results indicated a slightly higher daily incident rate than adult studies. At least half of the population were involved in some form of violent episode over the 12-month period. The majority of incidents were minor in nature. Nursing staff were the most frequent targets, although females showed an excess of inwardly directed aggression (self harm). A prior history of violent behaviour did not serve as a realistic predictor of frequency of violent incidents in this study. With increasing concern regarding the care of this disturbed group of young people, it was felt important to look closely at the nature of and handling of violent incidents on this unit. A second paper will consider in detail how these incidents were dealt with.

On The Possibility of an Autonomous History of Modern Southeast Asia

1961 ◽  
Vol 2 (2) ◽  
pp. 73-105 ◽  
Author(s):  
John R. W. Small
Keyword(s):  
Southeast Asia ◽  
Contemporary History ◽  
The Past ◽  
History Of

It is generally accepted that history is an element of culture and the historian a member of society, thus, in Croce's aphorism, that the only true history is contemporary history. It follows from this that when there occur great changes in the contemporary scene, there must also be great changes in historiography, that the vision not merely of the present but also of the past must change.

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