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Conceptualizing "positive attributes" across psychological perspectives. J Pers 2024; 92:683-696. [PMID: 37578033 DOI: 10.1111/jopy.12873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 07/20/2023] [Accepted: 07/28/2023] [Indexed: 08/15/2023]
Abstract
BACKGROUND The growth of positive psychology has birthed debate on the nature of what "positive" really means. Conceptualizations of positive attributes vary across psychological perspectives, and it appears these definitional differences stem from standards for "positive" espoused by three normative ethical frameworks: consequentialism, deontology, and virtue ethics. When definitions of "positive" do not align with one of these ethical schools, it appears researchers rely on preference to distinguish positive attributes. In either case, issues arise when researchers do not make their theoretical alignment explicit, leading to value-laden, often subjective criteria being smuggled into science as a description of what is positive. OBJECTIVE To foster a deeper critical understanding of the different approaches, we examine how these conceptual definitions of positive attributes (mis)align with their ethical traditions or fail to align with an ethical school. METHOD We review several positive attribute theories across psychological disciplines that serve as examples of the ethical and non-ethical sources of "positivity." Through this, we assess the conceptual criteria for what each approach considers "positive," note the degree of alignment between definition and ethical school, and draw attention to potential issues. CONCLUSION We advance the conceptual assessment of positive attributes by considering the implications of failing to explicitly address the theoretical foundation from which a construct is defined.
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Impact of a participatory action approach to virtue promotion among early adolescents. THE JOURNAL OF POSITIVE PSYCHOLOGY 2023. [DOI: 10.1080/17439760.2023.2169628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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3
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Transdisciplinary participatory action research: how philosophers, psychologists, and practitioners can work (Well) together to promote adolescent character development within context. THE JOURNAL OF POSITIVE PSYCHOLOGY 2023. [DOI: 10.1080/17439760.2023.2179933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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4
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Against reductivist character realism. PHILOSOPHICAL PSYCHOLOGY 2022. [DOI: 10.1080/09515089.2022.2063114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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P1023The impact of neural remodeling following myocardial infarction on ventricular arrhythmia in porcine model. Europace 2017. [DOI: 10.1093/ehjci/eux151.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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6
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PEDIATRICS CLINICAL RESEARCH. Neuro Oncol 2011. [DOI: 10.1093/neuonc/nor156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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7
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Patient participation in surgical pause. Anaesthesia 2010; 65:217. [PMID: 20402862 DOI: 10.1111/j.1365-2044.2009.06224.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Uncontrolled glaucoma secondary to an arteriovenous malformation in a Weill-Marchesani patient. OPTOMETRY (ST. LOUIS, MO.) 2001; 72:641-8. [PMID: 11712631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
BACKGROUND Weill-Marchesani syndrome is a rare condition with ocular and systemic manifestations. Common ocular signs are microspherophakia, ectopia lentis, and secondary glaucoma. The glaucoma is usually treatable through medical or surgical management. The most-common arteriovenous malformation (AVM) with ocular effects is the carotid-cavernous sinus fistula. It is very uncommon to observe ocular complications from an AVM in the area of the straight sinus and vein of Galen. AVMs in any location are unusual with Weill-Marchesani syndrome. CASE REPORT We present a case of severe asymmetric glaucoma in a Weill-Marchesani patient with an AVM in the area of the straight sinus and vein of Galen. The patient demonstrates the known clinical signs of Weill-Marchesani syndrome: short stature, microspherophakia, lens subluxation, and secondary glaucoma. An AVM is diagnosed with corresponding monocular proptosis and asymmetric glaucoma. The patient's serious systemic health problems and the location of the AVM make treatment difficult. CONCLUSION This case documents the very unusual occurrence of unresponsive glaucoma secondary to an AVM not located in the cavernous sinus. The Weill-Marchesani syndrome may be partially responsible for the glaucoma. Patients with Weill-Marchesani syndrome require early diagnosis in order to treat serious ocular and life-threatening systemic complications.
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Hostility and frontal lobe function in primary and secondary psychopathy. Arch Clin Neuropsychol 1998. [DOI: 10.1093/arclin/13.1.64a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Hostility and frontal lobe function in primary and secondary psychopathy. Arch Clin Neuropsychol 1998. [DOI: 10.1016/s0887-6177(98)90474-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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11
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Effects of drug abuse and HIV serostatus in minority men. Arch Clin Neuropsychol 1998. [DOI: 10.1093/arclin/13.1.125a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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The relationship between violence, conduct disorder, and brain function. Arch Clin Neuropsychol 1998. [DOI: 10.1016/s0887-6177(98)90472-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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14
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DNA adducts and related biomarkers in populations exposed to environmental carcinogens. ENVIRONMENTAL HEALTH PERSPECTIVES 1992; 98:133-137. [PMID: 1486841 PMCID: PMC1519595 DOI: 10.1289/ehp.9298133] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Prevention of environmentally related cancer will be enhanced by the availability of sensitive early warning systems and by improvements in quantitative assessment of human risks. Accordingly, we have carried out a series of molecular epidemiologic studies aimed at validating a panel of biologic markers, including carcinogen-DNA and -protein adducts, sister chromatid exchange, micronucleus formation, DNA strand breaks, and DNA repair capacity. Results from three such studies illustrate the usefulness of these biomarkers in elucidating low-dose-response relationships, correlations between biomarkers, and the range of variation in biomarkers between individuals exposed to similar concentrations of carcinogens. Low-level workplace or ambient exposures to styrene, ethylene oxide, and polycyclic aromatic hydrocarbons (PAH) were associated with significant increases in both molecular dose of carcinogens (adducts) and various markers of preclinical effects. Correlations between biomarkers varied by exposure. For example, in the styrene study, sister chromatid exchange frequency was not correlated with any of the markers, in contrast to the studies of ethylene oxide and PAH. Significant molecular effects were observed not only in occupationally exposed people but also in residents of an area in Poland characterized by high levels of air pollution. For example, the mean PAH-DNA level in exposed residents (winter sample) was 30.4 adducts per 10(8) nucleotides. This level was significantly higher than that of adducts seen in summer samples from the same area (4.2/10(8), or in winter samples from residents of a rural area (11.01/10(8). Significant seasonal variation in PAH-DNA adduct formation in this group was consistent with recorded fluctuations in air pollution levels. Striking interindividual variation was observed in all three exposed populations.
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Tumor necrosis factor production in HIV-seropositive subjects. Relationship with lung opportunistic infections and HIV expression in alveolar macrophages. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1991; 147:490-4. [PMID: 1906500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We have evaluated the TNF production by alveolar macrophages (AM) in 43 HIV-infected subjects in relation with 1) their clinical and biologic status; 2) the presence of lung opportunistic infections (OI); and 3) the expression of HIV by AM. This production was assessed in a standard chromium release test, using monocytic U937 cells as targets. The spontaneous TNF production by AM from patients without lung OI was higher than that from seronegative controls (p less than 0.02). This production by AM was similar to that of blood monocytes, suggesting that it was not related, in these subjects, to any particular lung status. The extent of TNF release by AM was correlated to the presence of a lymphocytic alveolitis (p less than 0.05), and not to the patients' clinical presentation nor to their CD4 cell count. Finally, AM from these subjects could be normally stimulated in vitro by IFN-gamma. On the other hand, it appeared that the spontaneous TNF release by AM shown in vitro to express HIV (p24+ AM) was significantly higher than that by their p24- counterparts (p less than 0.05) and by controls (p less than 0.01). In addition, contrasting with the marked increase of TNF release by p24- AM after their stimulation with IFN-gamma (p less than 0.001), p24+ AM appeared to be refractory to any stimulation by IFN, arguing for their activation in vivo. Finally, the spontaneous TNF release by AM was significantly increased during lung OI, compared with controls (p less than 0.01) as well as with AIDS patients without OI (p less than 0.01). In addition, the production of TNF by AM in these subjects was higher than that by the corresponding blood monocytes (p less than 0.02), suggesting a compartmentalization of this response within the lungs. In conclusion, it appears that the TNF production by AM of seropositive patients is highly related to the presence of lung OI as well as to the expression of HIV by these cells. In the context of the up-regulation of HIV expression induced by TNF in vitro, our data could suggest that the in vivo release of TNF by AM could participate in viral dissemination. Moreover, we hypothesize that the generation of activated AM refractory to any further stimulation could in turn lead to the development of additional pulmonary infections.
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Tumor necrosis factor production in HIV-seropositive subjects. Relationship with lung opportunistic infections and HIV expression in alveolar macrophages. THE JOURNAL OF IMMUNOLOGY 1991. [DOI: 10.4049/jimmunol.147.2.490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We have evaluated the TNF production by alveolar macrophages (AM) in 43 HIV-infected subjects in relation with 1) their clinical and biologic status; 2) the presence of lung opportunistic infections (OI); and 3) the expression of HIV by AM. This production was assessed in a standard chromium release test, using monocytic U937 cells as targets. The spontaneous TNF production by AM from patients without lung OI was higher than that from seronegative controls (p less than 0.02). This production by AM was similar to that of blood monocytes, suggesting that it was not related, in these subjects, to any particular lung status. The extent of TNF release by AM was correlated to the presence of a lymphocytic alveolitis (p less than 0.05), and not to the patients' clinical presentation nor to their CD4 cell count. Finally, AM from these subjects could be normally stimulated in vitro by IFN-gamma. On the other hand, it appeared that the spontaneous TNF release by AM shown in vitro to express HIV (p24+ AM) was significantly higher than that by their p24- counterparts (p less than 0.05) and by controls (p less than 0.01). In addition, contrasting with the marked increase of TNF release by p24- AM after their stimulation with IFN-gamma (p less than 0.001), p24+ AM appeared to be refractory to any stimulation by IFN, arguing for their activation in vivo. Finally, the spontaneous TNF release by AM was significantly increased during lung OI, compared with controls (p less than 0.01) as well as with AIDS patients without OI (p less than 0.01). In addition, the production of TNF by AM in these subjects was higher than that by the corresponding blood monocytes (p less than 0.02), suggesting a compartmentalization of this response within the lungs. In conclusion, it appears that the TNF production by AM of seropositive patients is highly related to the presence of lung OI as well as to the expression of HIV by these cells. In the context of the up-regulation of HIV expression induced by TNF in vitro, our data could suggest that the in vivo release of TNF by AM could participate in viral dissemination. Moreover, we hypothesize that the generation of activated AM refractory to any further stimulation could in turn lead to the development of additional pulmonary infections.
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Measuring environmental health status in Oukasie, 1987. S Afr Med J 1991; 79:29-31. [PMID: 1986446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
This article reports on some aspects of the physical environment and on environmental health services at Oukasie. The data were collected over a weekend in August 1987 by an interview and by direct inspection of the environment using a standard schedule. We had a 100% response rate on the interviews. There was a mean of 2.2 +/- 1.6 persons per room in the households, with brick houses being less crowded than non-brick houses. Private yards were generally kept very clean. Bucket latrines were unhygienic and used by an average of 4 families. No latrine was built to accepted standards. Garbage collection and emptying of the bucket latrines by the municipality seemed to be unsatisfactory. Our overall impression was that where responsibility for maintenance of hygiene is either undefined, such as the collection chambers of bucket latrines, or a responsibility of the public authorities, such as garbage collection and water drainage, there is an unsatisfactory state of hygiene. Where maintenance of cleanliness is clearly a private responsibility, such as the maintenance of the cleanliness of private yards, the general status of hygiene is good.
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Community health survey of Oukasie, 1987. S Afr Med J 1991; 79:32-4. [PMID: 1986447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A series of surveys were conducted at the request of the community of Oukasie to determine certain public health information in the township, a peri-urban black community. This article describes two of these surveys. The first, a census and partial demographic survey, showed that the total black population was around 6,300 with a mean household occupancy of 4.1. Some of the estimated vital statistics calculated were an infant mortality rate of 36.6/1,000, a crude birth rate of 28.0/1,000, a crude death rate of 6.5/1,000, and a general fertility rate of 99.3/1,000. The second survey into the nutritional and immunisation status of children aged under 5 years showed that 20% of children were underweight and nearly half were incompletely immunised at 1 year of age. These studies, involving local community and student volunteers, were rapidly and inexpensively done and provide basic public health information.
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Biologic markers in risk assessment for environmental carcinogens. ENVIRONMENTAL HEALTH PERSPECTIVES 1991; 90:247-254. [PMID: 2050068 PMCID: PMC1519502 DOI: 10.1289/ehp.90-1519502] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The potential of biologic markers to provide more timely and precise risk assessments for environmental carcinogens is viewed against the current state-of-the-art in biological monitoring/molecular epidemiology. Biologic markers such as carcinogen-DNA adducts and oncogene activation are currently considered valid qualitative indicators of potential risk, but for most chemical exposures research is needed to establish their validity as quantitative predictors of cancer risk. Biologic markers have, however, already provided valuable insights into the magnitude of interindividual variation in response to carcinogenic exposures, with major implications for risk assessment.
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Cellular targets and host genes in multistage carcinogenesis. FEDERATION PROCEEDINGS 1984; 43:2287-94. [PMID: 6201400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Recent studies indicate that although cellular DNA is the critical target in the action of initiating carcinogens, specific membrane-associated receptors mediate the actions of certain tumor promoters. A stereochemical model is presented to explain how three different types of tumor promoters (phorbol esters, indole alkaloids, and polyacetates) can interact with the same class of cellular receptors. Multistage chemical carcinogenesis might involve progressive alterations in the expression of cellular DNA sequences homologous to oncogenes and regulatory sequences in certain retroviruses. We found that the oncogene c-mos is not rearranged or expressed in a series of carcinogen-transformed murine C3H 10T112 cells. These cells do express, however, a unique set of poly(A)+ RNAs that contain sequences homologous to the Moloney leukemia virus long terminal repeat sequence. Studies are in progress to determine the significance of this finding with respect to the carcinogenic process.
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Initial cellular targets and eventual genomic changes in multistage carcinogenesis. IARC SCIENTIFIC PUBLICATIONS 1984:277-97. [PMID: 6549538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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Multistage carcinogenesis involves multiple genes and multiple mechanisms. JOURNAL OF CELLULAR PHYSIOLOGY. SUPPLEMENT 1984; 3:127-37. [PMID: 6378934 DOI: 10.1002/jcp.1041210416] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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23
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Comparative effects of aplysiatoxin, debromoaplysiatoxin, and teleocidin on receptor binding and phospholipid metabolism. Cancer Res 1983; 43:1529-35. [PMID: 6299522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We have compared the activities of aplysiatoxin and debromoaplysiatoxin, two polyacetate marine algae toxins, with teleocidin, a tumor-promoting indole alkaloid from Streptomyces, with respect to inhibition of specific binding of epidermal growth factor, and phorbol-12,13-dibutyrate to their respective receptors and ability to stimulate the release of radioactivity from cells prelabeled with choline or arachidonic acid. Although these compounds have chemical structures that are quite different from the phorbol esters, both aplysiatoxin and teleocidin are essentially equipotent with the potent tumor promoter 12-O-tetradecanoylphorbol-13-acetate in all four assays. The fact that aplysiatoxin and teleocidin inhibit phorbol-12,13-dibutyrate-receptor binding suggests that their biological activities are mediated by binding to the same receptors utilized by the phorbol esters. Debromoaplysiatoxin, a debrominated form of aplysiatoxin, is about 10-fold weaker than aplysiatoxin in inhibiting epidermal growth factor and phorbol-12,13-dibutyrate-receptor binding, but is equipotent with aplysiatoxin in stimulating the release of lipid metabolites from the prelabeled cells. The results are discussed in terms of possible heterogeneity of cellular receptors for this group of compounds.
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Structure of the operator-binding domain of bacteriophage lambda repressor: implications for DNA recognition and gene regulation. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 1983; 47 Pt 1:435-40. [PMID: 6305562 DOI: 10.1101/sqb.1983.047.01.051] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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25
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Abstract
From differences in the ability of fragments of the lambda repressor to protect operator bases from chemical modification we suggest that the first few N-terminal residues of the lambda repressor form an extended arm that reaches around the back of the DNA helix when repressor binds to the operator.
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Co-crystallization of repressor and operator fragments from bacteriophage lambda. Acta Crystallogr A 1981. [DOI: 10.1107/s0108767381098188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Completed DNA sequences and organization of repressor-binding sites in the operators of phage lambda. J Mol Biol 1977; 112:265-77. [PMID: 875019 DOI: 10.1016/s0022-2836(77)80143-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Novel properties of a restriction endonuclease isolated from Haemophilus parahaemolyticus. Proc Natl Acad Sci U S A 1976; 73:293-7. [PMID: 1061131 PMCID: PMC335893 DOI: 10.1073/pnas.73.2.293] [Citation(s) in RCA: 85] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The sequences in lambda DNA in and around six sites cut by Hph, a restriction enzyme isolated from Haemophilus parahaemolyticus, are compared. The enzyme produces a staggered cut around an AT or TA base pair, but the sequences immediately surroinding the cleavage sites bear no obvious relation to one another. Eight (in some cases nine) base pairs to one side of each cleavage site is the common sequence TCACC AGTGG. Two lines of evidence indicate that these bases constitute part or all of the Hph recognition site. First, mutations in this sequence prevent Hph cutting. Second, dimethylsulfate-mediated methylation of Gs and As in this site prevent cutting, whereas methylation of purines in the region between this sequence and the cleavage sites has no such effect. There is discernible 2-fold rotational symmetry neither in the common sequence nor around the cleavage sites.
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Chain length determination of small double- and single-stranded DNA molecules by polyacrylamide gel electrophoresis. Biochemistry 1975; 14:3787-94. [PMID: 1174504 DOI: 10.1021/bi00688a010] [Citation(s) in RCA: 913] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We describe the use of polyacrylamide gel electrophoresis to estimate chain lengths of double- and single-stranded DNA molecules in the size range 20-1000 base pairs (or nucleotides). Double-stranded DNA molecules of known length produced either by organic synthesis or by restriction endonuclease digestion of viral DNAs were used as standards. The relative electrophoretic mobilities of these standards were examined on both nondenaturing (aqueous) polyacrylamide gels and on denaturing gels containing 7 M urea or 98% formamide. Electrophoretic mobility of DNA is a linear function of the log of molecular weight if appropriate conditions are used, although exceptions are noted. Chain lengths can be conveniently estimated by using as standards bacteriophage gamma DNA restriction fragments or commercially available tracking dyes.
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Abstract
Nucleotide sequences in two wild-type and six mutant operators in the DNA of phage lambda are compared. Strikingly similar 17 base pair units are found which we identify as the repressor binding sites. Each operator contains multiple repressor binding sites separated by A-T rich spacers. Elements of 2 fold rotational symmetry are present in each of the sites. Superimposed on each operator is an E. coli RNA polymerase recognition site (promoter). Similarities in the sequences of the two lambda promoters, a lac promoter, and an E. coli RNA polymerase recognition site in SV40 DNA are noted.
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Abstract
Rabbit globin mRNA was copied by AMV reverse transcriptase in the presence of various concentrations of deoxyribonucleotides (dNTPs). The cDNAs were analyzed by electrophoresis under denaturing conditions in formamide-polyacrylamide gels. Discrete size products were detected, ranging from 65 to 650 nucleotides-that is, up to the full length of the mRNA template. Increasing the concentrations of all four dNTPs stimulated formation of full-length transcripts and made the incomplete copies less abundant. Hybridization and nuclease digestion experiments indicated that the full-size product is indeed a complete transcript of globin mRNA. Similar results were obtained with chorion mRNAs. The possible usefulness of the discrete partial transcripts is discussed.
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Abstract
The sequence of 72 base pairs of the rightward operator (O-R) of bacteriophage lambda is presented as determined with simple and rapid methods for direct DNA sequencing. The sequence of an operator mutant is also described. The methods are of general use in sequencing DNA fragments with unique 5' ends up to 50 base pairs in length. Previous experiments have shown that this operator contains multiple sites recognized by the lambda phage repressor. We believe we have identified three of these sites.
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