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1.
Rev Neurol (Paris) ; 177(8): 995-1000, 2021 Oct.
Article in English | MEDLINE | ID: mdl-33454126

ABSTRACT

Twenty-three severe migraine participants were studied to investigate social and emotional cognition features and explore their relationship with depression, anxiety and alexithymia. In comparison to normative data, 74% were under the norm for the Faux Pas subtest, 13% for the facial emotion recognition subtest and 52% for the overall composite score of the mini-SEA. Factor 1, Factor 3, and the total score of the TAS-20 were negatively correlated with the Faux Pas subtest. Our preliminary study shows that severe migraine patients present difficulties in inferring mental states, which could be related to alexithymia. It would be useful to identify these impairments in order to improve the quality of care provided. Clinical Trials registration number: NCT03577548.


Subject(s)
Cognition , Migraine Disorders , Affective Symptoms/diagnosis , Affective Symptoms/epidemiology , Emotions , Headache , Humans , Migraine Disorders/diagnosis , Migraine Disorders/epidemiology
2.
ISME J ; 14(2): 492-505, 2020 02.
Article in English | MEDLINE | ID: mdl-31666657

ABSTRACT

The impact of modern agriculture on the evolutionary trajectory of plant pathogens is a central question for crop sustainability. The Green Revolution replaced traditional rice landraces with high-yielding varieties, creating a uniform selection pressure that allows measuring the effect of such intervention. In this study, we analyzed a unique historical pathogen record to assess the impact of a major resistance gene, Xa4, in the population structure of Xanthomonas oryzae pv. oryzae (Xoo) collected in the Philippines in a span of 40 years. After the deployment of Xa4 in the early 1960s, the emergence of virulent pathogen groups was associated with the increasing adoption of rice varieties carrying Xa4, which reached 80% of the total planted area. Whole genomes analysis of a representative sample suggested six major pathogen groups with distinctive signatures of selection in genes related to secretion system, cell-wall degradation, lipopolysaccharide production, and detoxification of host defense components. Association genetics also suggested that each population might evolve different mechanisms to adapt to Xa4. Interestingly, we found evidence of strong selective sweep affecting several populations in the mid-1980s, suggesting a major bottleneck that coincides with the peak of Xa4 deployment in the archipelago. Our study highlights how modern agricultural practices facilitate the adaptation of pathogens to overcome the effects of standard crop improvement efforts.


Subject(s)
Disease Resistance/genetics , Genetics, Microbial , Oryza/microbiology , Selective Breeding/genetics , Xanthomonas/genetics , Genes, Plant , Genetics, Population , Genome, Bacterial , Oryza/genetics , Plant Diseases/genetics , Plant Diseases/microbiology , Plant Pathology , Plant Proteins/genetics , Xanthomonas/pathogenicity
3.
Rev Neurol (Paris) ; 174(1-2): 44-55, 2018.
Article in English | MEDLINE | ID: mdl-28673660

ABSTRACT

INTRODUCTION: Cognitive evaluation of young subjects is now widely carried out for non-traumatic diseases such as multiple sclerosis, HIV, or sleep disorders. This evaluation requires normative data based on healthy adult samples. However, most clinicians use a set of tests that were normed in an isolated manner from different samples using different cutoff criteria. Thus, the score of an individual may be considered either normal or impaired according to the norms used. It is well established that healthy adults obtained low-test scores when a battery of tests is administered. Thus, the knowledge of low base rates is required so as to minimize false diagnosis of cognitive impairment. The aim of this study was twofold (1) to provide normative data for RAPID-II battery in healthy adults, and (2) estimate the proportion of healthy adults having low scores across this battery. METHODS: Norms for the 44 test scores of the RAPID-II test battery were developed using the overall sample of 335 individuals based on three categories of age (20 to 29, 30 to 39, and 40 to 49 years) and two educational levels: Baccalaureate or higher educational degree (high educational level), lower than baccalaureate (low educational level). The 5th, 25th, 50th, and 75th percentiles were calculated from the six age and education subsamples and used to define norms. The frequency of low scores on the RAPID-II battery was calculated by simultaneously examining the performance of 33 primary scores. A low score was defined as less than or equal to the 5th percentile drawn from the six age and education normative subsamples. In addition, the percentages of low scores were also determined when all possible combinations of two-test scores across the RAPID-II were considered in the overall normative sample. RESULTS: Our data showed that 59.4% subjects of the normative sample obtained at least one or more low score. With more than 9 test scores, this percentage was equal to 0% in the normative sample. Among all combinations of two-test scores, 96% had a false positive rate<2%. CONCLUSION: Low scores are very common in young healthy subjects and are more obvious when simultaneously analyzing test scores across a battery of tests and are thus not necessarily indicative of cognitive impairment. The combinations of two-test scores can be a useful tool to improve the interpretation of low scores.


Subject(s)
Cognition/physiology , Neuropsychological Tests , Adult , Age Factors , Cognitive Dysfunction/diagnosis , Cognitive Dysfunction/psychology , Educational Status , False Positive Reactions , Female , Healthy Volunteers , Humans , Male , Memory , Mental Status and Dementia Tests , Middle Aged , Reference Values , Trail Making Test , Verbal Behavior , Young Adult
4.
Zootaxa ; 4072(2): 235-53, 2016 Jan 29.
Article in English | MEDLINE | ID: mdl-27395921

ABSTRACT

The fur-mite genus Soricilichus Fain, 1970 (3 species) (Acariformes: Chirodiscidae) represented by permanent symbionts of the African shrews of the subfamily Crocidurinae (Soricomorpha: Soricidae) is revised. The external morphology of these species was investigated with light and scanning electron microscopy. Based on the type specimens and newly obtained samples, 2 recognized species, S. scutisorex Fain, 1970 from Scutisorex somereni Thomas and S. kivuensis Fain, 1981 from Crocidura sp.-both are from DR of Congo-are redescribed. A new species S. sylvisorex sp. nov. found on shrews of the genera Sylvisorex (S. granti Thomas (type host), S. lunaris Thomas, S. vulcanorum Hutterer and Verheyen) and Crocidura (C. denti Dollman, C. cf. niobe, Crocidura sp.), collected in the DR Congo is also described. An amended generic diagnosis, including description of female immature stages, and a key to species are provided.


Subject(s)
Mites , Shrews/physiology , Shrews/parasitology , Animals , Female , Male , Mites/anatomy & histology , Mites/classification , Mites/physiology , Symbiosis
5.
Syst Parasitol ; 93(5): 493-9, 2016 06.
Article in English | MEDLINE | ID: mdl-27221002

ABSTRACT

A new species Crocidurobia faini n. sp. (Acariformes: Myobiidae) recorded on Crocidura denti Dollman (type-host) (Soricomorpha: Soricidae), Crocidura cf. niobe Thomas, Crocidura cf. littoralis Heller, and Crocidura sp. from DR Congo is described. This new species differs in both sexes from all other species of the subgenus Crocidurobia Jameson, 1970 by short setae c2, more than three times shorter than setae se. Females of the new species differ from those of the close species Crocidurobia toroensis Dusbabek, 1983 by setal bases e2 situated slightly anterior to the level of setal bases e1; males of the new species differ by the genital shield bearing five pairs of setae situated anterior to the level of setal bases d1.


Subject(s)
Mites/anatomy & histology , Mites/classification , Shrews/parasitology , Animals , Congo , Female , Male , Species Specificity
6.
Rev Neurol (Paris) ; 171(8-9): 655-61, 2015 Sep.
Article in French | MEDLINE | ID: mdl-26212200

ABSTRACT

The aim of this study was to evaluate the impact, on a regional scale (Franche-Comté), of 3 National Alzheimer care plans, particularly concerning the development of the offer of care management by clinicians as well as the panel of diagnoses concerned. Data on sociodemographic, neuropsychological and diagnostic characteristics were retrieved from the RAPID regional database between 1st January 2003 and 31st December 2012. These analyses focused exclusively on patients who had an initial consultation (n=12,017) during the same period. The existence of a previously established health network capable of carrying out governmental health plans has produced an effective interface between regional administrative structures responsible for the implementation of these plans and health professionals responsible for carrying out them out. This network study, the use of a battery of tests and a common software database have enabled the development of patient care management throughout the Franche-Comté region. It also showed the diversification of diagnoses mentioned over the past years as well as changes in clinical practices on how to address the issue of cognitive impairment.


Subject(s)
Databases, Factual , Disease Management , Memory Disorders/epidemiology , National Health Programs/organization & administration , Registries , Age Distribution , Aged , Aged, 80 and over , Alzheimer Disease/diagnosis , Alzheimer Disease/epidemiology , Alzheimer Disease/psychology , Alzheimer Disease/therapy , Brain Injuries/diagnosis , Cognition Disorders/diagnosis , Cognition Disorders/epidemiology , Cognition Disorders/therapy , Diagnosis, Differential , Disease Progression , Female , France/epidemiology , Health Plan Implementation , Humans , Male , Memory Disorders/diagnosis , Memory Disorders/therapy , Mental Disorders/diagnosis , National Health Programs/statistics & numerical data , Neurodegenerative Diseases/diagnosis , Neuropsychological Tests , Software
7.
Rev Neurol (Paris) ; 171(4): 382-9, 2015 Apr.
Article in French | MEDLINE | ID: mdl-25847397

ABSTRACT

Episodic memory disorders are frequent in patients with temporal lesion. Verbal or visuo-spatial memory disorders depend on the location and the lateralization of the lesion. These disorders are well described in temporal epilepsy but rarely in population with cerebral tumor and especially not specifically focus on temporal glioma. The purpose of this study was to describe neuropsychological examination in patient with temporal glioma in the database of the regional memory centre of Besançon. Four patients were identified (all right-handed and with a left temporal glioma). Verbal episodic memory impairment and auditory-verbal short-term memory impairment were observed. One patient had also visual memory disorders. Therefore, further investigations showed an associated Alzheimer's disease. This finding modified the clinical management of this patient. Extensive neuropsychological assessment should be systematic initially to seek an associated pathology, especially in elderly patients, if the cognitive profile is unusual, during the follow-up to better understand cognitive evolution and the effect of therapies on cognition.


Subject(s)
Brain Neoplasms/complications , Brain Neoplasms/psychology , Glioma/complications , Glioma/psychology , Memory Disorders/etiology , Memory Disorders/psychology , Temporal Lobe , Adolescent , Aged , Alzheimer Disease/complications , Alzheimer Disease/psychology , Brain Neoplasms/drug therapy , Disease Progression , Epilepsy/complications , Female , Functional Laterality , Glioma/drug therapy , Humans , Male , Memory, Episodic , Neuropsychological Tests , Retrospective Studies
8.
Rev Neurol (Paris) ; 167(6-7): 495-504, 2011.
Article in French | MEDLINE | ID: mdl-21474155

ABSTRACT

INTRODUCTION: The aim of this study was to propose diagnostic norms for the rapid neuropsychological battery, in the detection of cognitive impairment due to Alzheimer's disease. POPULATION AND METHODS: Three hundred and fifty-two control subjects (mean MMSE : 27.3 ± 2.5) and 676 patients with Alzheimer's disease (mean MMSE : 22.9 ± 2.6) at a mild stage (CDR = 1) were selected according to age (60-69, 70-79 and 80-89 years) and educational level (French primary Education Certificate or lower versus Certificate of Professional Aptitude or the School Leaving Certificate versus the Baccalaureate or higher). Age and education-adjusted cut-off scores were calculated using Receiver Operating Characteristic curves so as to determine the discriminative ability (sensitivity, specificity) of each test from the RAPID neuropsychological battery. Cut-off scores with a specificity set at least at 90% were also proposed. RESULTS: The Free and Cued Recall Test exhibited good sensitivity (from 87% to 100% for free recall and from 85% to 98% for total recall) and specificity (from 85% to 96% for free recall and from 86% to 100% for total recall). For the other tests, sensitivities and specificities were lower. CONCLUSION: The use of these two types of cut-off scores should help the clinician in the diagnosis of Alzheimer's disease by limiting the risk of false positives and false negatives. The choice of the cut-off scores will depend on the patient's individual clinical context.


Subject(s)
Alzheimer Disease/psychology , Neuropsychological Tests/standards , Age Factors , Aged , Aged, 80 and over , Cognition/physiology , Diagnostic and Statistical Manual of Mental Disorders , Educational Status , False Negative Reactions , False Positive Reactions , Female , Humans , Male , Mental Recall/physiology , Middle Aged , ROC Curve , Reference Values , Sample Size , Trail Making Test
9.
BJOG ; 118(5): 564-77, 2011 Apr.
Article in English | MEDLINE | ID: mdl-21291506

ABSTRACT

OBJECTIVE: To investigate whether initiating external cephalic version (ECV) earlier in pregnancy might increase the rate of successful ECV procedures, and be more effective in decreasing the rate of non-cephalic presentation at birth and of caesarean section. DESIGN: An unblinded multicentred randomised controlled trial. SETTING: A total of 1543 women were randomised from 68 centres in 21 countries. POPULATION: Women with a singleton breech fetus at a gestational age of 33(0/7) weeks (231 days) to 35(6/7) weeks (251 days) of gestation were included. METHODS: Participants were randomly assigned to having a first ECV procedure between the gestational ages of 34(0/7) (238 days) and 35(6/7) weeks of gestation (early ECV group) or at or after 37(0/7) (259 days) weeks of gestation (delayed ECV group). MAIN OUTCOME MEASURES: The primary outcome was the rate of caesarean section; the secondary outcome was the rate of preterm birth. RESULTS: Fewer fetuses were in a non-cephalic presentation at birth in the early ECV group (314/765 [41.1%] versus 377/768 [49.1%] in the delayed ECV group; relative risk [RR] 0.84, 95% CI 0.75, 0.94, P=0.002). There were no differences in rates of caesarean section (398/765 [52.0%] versus 430/768 [56.0%]; RR 0.93, 95% CI 0.85, 1.02, P=0.12) or in risk of preterm birth (50/765 [6.5%] versus 34/768 [4.4%]; RR 1.48, 95% CI 0.97, 2.26, P=0.07) between groups. CONCLUSION: External cephalic version at 34-35 weeks versus 37 or more weeks of gestation increases the likelihood of cephalic presentation at birth but does not reduce the rate of caesarean section and may increase the rate of preterm birth.


Subject(s)
Breech Presentation/therapy , Version, Fetal/methods , Adult , Breech Presentation/mortality , Cesarean Section/mortality , Cesarean Section/statistics & numerical data , Female , Humans , Length of Stay , Maternal Mortality , Pregnancy , Pregnancy Outcome , Time Factors , Version, Fetal/mortality , Young Adult
10.
Ultrasound Obstet Gynecol ; 18(3): 244-7, 2001 Sep.
Article in English | MEDLINE | ID: mdl-11555454

ABSTRACT

OBJECTIVE: To evaluate the incidence of abnormal fetal findings and Cesarean delivery for non-reassuring fetal status as a function of birth weight in the uncomplicated prolonged pregnancy. METHODS: Seven hundred and ninety-two patients at or beyond 41 weeks' gestation were managed expectantly. Population-specific birth-weight percentiles were calculated. Fetuses were retrospectively categorized as small (birth weight < 10th percentile), average (10th percentile < or = birth weight < or = 90th percentile) or large (birth weight > 90th percentile). The incidences of abnormal antepartum fetal testing results (i.e. oligohydramnios and/or abnormal non-stress testing) and Cesarean delivery for intrapartum non-reassuring fetal status were calculated for these three birth-weight categories. RESULTS: There was a significant inverse relationship between the incidence of abnormal fetal testing and birth-weight category (36%, 14% and 9% for small, average and large fetuses, respectively, P < 0.001). Small fetuses were more likely to require a Cesarean delivery for non-reassuring fetal status during labor than were all other fetuses (12.3% vs. 5.3%, P = 0.024). CONCLUSIONS: The frequency of oligohydramnios and abnormal non-stress testing is inversely related to birth weight in the expectantly managed prolonged pregnancy. In addition, small fetuses born at or beyond 41 weeks' gestation have an increased rate of Cesarean delivery for intrapartum non-reassuring fetal status.


Subject(s)
Cesarean Section , Fetal Weight , Pregnancy, Prolonged , Birth Weight , Female , Fetal Growth Retardation/diagnosis , Gestational Age , Heart Rate, Fetal , Humans , Oligohydramnios/complications , Oligohydramnios/diagnosis , Pregnancy , Retrospective Studies , Risk Factors
11.
Placenta ; 22(5): 412-7, 2001 May.
Article in English | MEDLINE | ID: mdl-11373151

ABSTRACT

To assess the effects of antenatal corticosteroid use on placental histopathology, we have reviewed a database of 463 consecutive non-anomalous singleton liveborns delivered at less than 32 weeks between April 1988 and December 1994, of which 280 received one or more doses of corticosteroids for promotion of fetal lung maturation. Patients were grouped by the number of corticosteroid doses received (analyzed as none, 1, 2 and 3 or more doses). Clinical and demographic factors were recorded prospectively. Placental histopathology was reviewed blinded to clinical factors except gestational age, and 42 distinct placental lesions were examined and scored for severity. Data were analyzed by contingency tables, one-way analysis of variance, and linear regression analysis. Among clinical variables, univariate analysis showed that the number of corticosteroid doses was significantly related to presence of labour prior to delivery, pre-eclampsia, premature rupture of membranes and clinical suspicion or diagnosis of chorioamnionitis. Using linear regression analysis with these clinical variables as confounders, increased number of doses of antenatal corticosteroids was related to increased severity of villous fibrosis and stromal mineralization, and fewer villous infarcts.


Subject(s)
Adrenal Cortex Hormones/therapeutic use , Obstetric Labor, Premature/pathology , Placenta/pathology , Adrenal Cortex Hormones/administration & dosage , Adult , Analysis of Variance , Chorioamnionitis/pathology , Female , Fetal Membranes, Premature Rupture/pathology , Fetal Organ Maturity/drug effects , Gestational Age , Humans , Linear Models , Lung/embryology , Pre-Eclampsia/pathology , Pregnancy
12.
J Matern Fetal Med ; 9(5): 287-90, 2000.
Article in English | MEDLINE | ID: mdl-11132584

ABSTRACT

OBJECTIVE: To evaluate the test characteristics of sonographic estimation of fetal weight in the detection of macrosomia in nondiabetic postdates patients as a function of maternal glucose value measured after glucose challenge testing performed at 24-28 weeks of gestation. METHODS: At or beyond 41 weeks' gestation, 656 nondiabetic patients had sonographic estimation of fetal weight. Receiver-operator characteristic curve analysis was used to define the glucose value at which an optimal number of macrosomic fetuses could be identified. The test characteristics of sonography in the prediction of macrosomia in the two populations defined by that cut-off value were evaluated. RESULTS: A glucose level of 120 mg/dL (6.6 mM) was identified as the optimal cutoff for prediction of birth weight > or = 4,000 g. In the group with a glucose level > or = 120 mg/dL, sonographic estimation of fetal weight in the detection of macrosomia offered a sensitivity, specificity, and positive and negative predictive values of 63%, 91%, 71%, and 86%, respectively. In those with glucose level <120 mg/dL, sonography demonstrated a sensitivity, specificity, and positive and negative predictive values of 65%, 89%, 60%, and 91%, respectively. CONCLUSIONS: In postdates nondiabetic patients, routine glucose challenge testing performed early in pregnancy has limited ability to improve the test characteristics of sonography to predict macrosomia. The positive predictive value of sonographically suspected macrosomia increases from 60-71% in patients whose glucose level was > or = 120 mg/dL (P = 0.002).


Subject(s)
Blood Glucose/metabolism , Fetal Macrosomia/diagnosis , Fetal Weight , Pregnancy, Prolonged , Ultrasonography, Prenatal/standards , Adult , Female , Fetal Macrosomia/diagnostic imaging , Gestational Age , Humans , Medical Records , Predictive Value of Tests , Pregnancy , ROC Curve , Sensitivity and Specificity
13.
Am J Perinatol ; 15(10): 581-4, 1998.
Article in English | MEDLINE | ID: mdl-9926880

ABSTRACT

We present an unusual case in which sonographic assessment at 33 weeks' gestation, 5 weeks following a normal fetal anatomical survey and biometry, demonstrated a large, irregular-shaped, echogenic, suprasellar midline intracranial mass occupying the anterior and middle fossas. Associated severe obstructive hydrocephalus with "dangling" choroid plexus bilaterally was noted with a markedly thin cortical mantle and increased cranial biometry. Elective cesarean delivery was performed due to the associated craniomegaly at 37 weeks' gestation. Although breathing spontaneously at delivery, the infant subsequently required mechanical ventilation and developed neonatal seizures. A ventriculoperitoneal shunt was placed on Day 3 of life. Transcranial needle biopsy demonstrated malignant astrocytoma (glioblastoma multiforme). This case suggests the rapid development of an intracranial malignant astrocytoma over a relatively short period of time. The significant ultrasonographic finding of an intracranial, destructive fetal deformation, following a normal examination 5 weeks previously, demonstrates the limitations of screening ultrasonography in predicting perinatal outcome.


Subject(s)
Brain Neoplasms/congenital , Brain Neoplasms/diagnostic imaging , Glioblastoma/congenital , Glioblastoma/diagnostic imaging , Ultrasonography, Prenatal , Adult , Cesarean Section , Female , Gestational Age , Humans , Hydrocephalus/etiology , Infant, Newborn , Male , Pregnancy , Pregnancy Trimester, Third , Ventriculoperitoneal Shunt
14.
Rev. argent. cir ; 40(3/4): 151-7, 1981.
Article in Spanish | BINACIS | ID: bin-36642

ABSTRACT

De una serie de 421 pacientes con cancer de mama tratados entre los anos 1967 y 1977, se analizaron 113, a quienes se efectuo cirugia convencional (mastectomia de Halsted) con o sin radioterapia. Se obtuvo una sobrevida de 3 y 5 anos, en estadio I 95% y 92%; estadio II 78% y 70% y en el estadio III 56% y 36%.Desde 1977 el tratamiento incluye quimioterapia adyuvante. Han variado las indicaciones para radioterapia y se efectuan maniobras quirurgicas menores en las lesiones tempranas


Subject(s)
Breast Neoplasms , Mastectomy , Radiotherapy
15.
Rev. argent. cir ; 40(3/4): 151-7, 1981.
Article in Spanish | LILACS | ID: lil-3721

ABSTRACT

De una serie de 421 pacientes con cancer de mama tratados entre los anos 1967 y 1977, se analizaron 113, a quienes se efectuo cirugia convencional (mastectomia de Halsted) con o sin radioterapia. Se obtuvo una sobrevida de 3 y 5 anos, en estadio I 95% y 92%; estadio II 78% y 70% y en el estadio III 56% y 36%.Desde 1977 el tratamiento incluye quimioterapia adyuvante. Han variado las indicaciones para radioterapia y se efectuan maniobras quirurgicas menores en las lesiones tempranas


Subject(s)
Breast Neoplasms , Mastectomy , Radiotherapy
16.
Pathol Biol (Paris) ; 25(9): 629-36, 1977 Nov.
Article in French | MEDLINE | ID: mdl-341052

ABSTRACT

During eleven months the authors studied the erythrocytoplasma lithium ration in 46 patients on chronic lithium maintenance. They observed that the individual variations of this ratio are of the same magnitude in "cycloid psychosis" and in chronic schizophrenia. But, furthermore these variations are significantly more important than in neurosis. They report that this ratio increases significantly in manic depressive illness during the active manic or depressive phases, and they compare their results to those of the literature.


Subject(s)
Erythrocytes/analysis , Lithium/blood , Mental Disorders/drug therapy , Adult , Aged , Bipolar Disorder/drug therapy , Female , Humans , Lithium/therapeutic use , Male , Middle Aged , Neurotic Disorders/drug therapy , Schizophrenia/drug therapy
17.
J Bacteriol ; 125(1): 48-57, 1976 Jan.
Article in English | MEDLINE | ID: mdl-1245461

ABSTRACT

Wild-type strains of Saccharomycopsis lipolytica are able to use lysine as a carbon or a nitrogen source, but not as a unique source for both. Mutants were selected that could not use lysine either as a nitrogen or as a carbon source. Some of them, however, utilized N-6-acetyllysine or 5-aminovaleric acid. Many of the mutants appeared to be blocked in both utilizations, suggesting a unique pathway for lysine degradation (either as a carbon or as a nitrogen source). Genetic characterization of these mutants was achieved by complementation and recombination tests.


Subject(s)
Ascomycota/metabolism , Lysine/metabolism , Mutation , Saccharomycopsis/metabolism , 2-Aminoadipic Acid/metabolism , Genetic Complementation Test , Genetic Linkage , Lysine/analogs & derivatives , Phenotype , Pipecolic Acids/metabolism , Recombination, Genetic , Saccharomycopsis/growth & development , Valerates/metabolism
19.
Arch Microbiol ; 104(1): 89-94, 1975 Jun 20.
Article in English | MEDLINE | ID: mdl-1156098

ABSTRACT

Unstable clones excreting L-lysine into their growth medium are obtained at a very high frequency following UV irradiation in both haploid and diploid strains of Saccharomycopsis lipolytica, provided they carry a mutation affecting the first enzyme of the lysine pathway and confering resistance to end product inhibition. The phenotype can be stabilized in some sublines; it appears as dominant and coupled with a decrease in spore viability. Excretion in batch cultures is confined to the end of the exponential phase, and seems not to consist in a simple release of the lysine pool content.


Subject(s)
Ascomycota/radiation effects , Lysine/biosynthesis , Saccharomycopsis/radiation effects , Ultraviolet Rays , Amino Acids/biosynthesis , Cell Survival/radiation effects , Clone Cells , Crosses, Genetic , Culture Media , Diploidy , Genes, Regulator/radiation effects , Genetic Variation , Kinetics , Mutation , Phenotype , Radiation Genetics , Saccharomycopsis/metabolism , Spores, Fungal/growth & development
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