1
|
Are HIV Prevention Services Reaching all LGBTQ+ Youth? An Intersectional Analysis in a National Sample. AIDS Behav 2024; 28:1435-1446. [PMID: 38085427 DOI: 10.1007/s10461-023-04230-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2023] [Indexed: 03/16/2024]
Abstract
Although research has examined disparities in HIV prevention behaviors, intersectional research is needed to understand who may be underserved. This study examines disparities in consistent condom use, HIV testing, and PrEP awareness and use across assigned sex, gender identity, sexual orientation, and racial/ethnic identity in a large sample of sexually active LGBTQ+ youth (mean age = 16.5) who completed the 2022 LGBTQ National Teen Survey. Four social identities were included as indicators in Chi-Square Automated Interaction Detection models to uncover disparate rates of HIV preventive behaviors. Generally, HIV testing and PrEP services were higher among gay/lesbian and queer youth assigned male, and lower among those assigned female. Certain LGBTQ+ youth may be systematically missed by these services, (e.g., those assigned female; those assigned male who also identify as bisexual, pansexual, asexual, questioning, or straight (and trans/gender diverse)). Providers should strive to serve populations who are not being reached by HIV prevention services.
Collapse
|
2
|
Bias-based bullying, self-esteem, queer identity pride, and disordered eating behaviors among sexually and gender diverse adolescents. Int J Eat Disord 2024; 57:303-315. [PMID: 37990394 PMCID: PMC10922269 DOI: 10.1002/eat.24092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 11/23/2023]
Abstract
OBJECTIVE Limited research incorporates an intersectional approach when evaluating disordered eating behaviors among those holding minoritized social positions, such as lesbian, gay, bisexual, queer, questioning, and/or transgender/gender diverse (LGBTQ) adolescents. The current study assessed stigma experiences from peers at school, self-esteem, LGBTQ pride, and overlapping social positions as they relate to disordered eating behaviors among LGBTQ adolescents. METHOD Participants included 11,083 adolescents (Mage = 15.6, SD = 1.3; 34.8% transgender/gender diverse) from a large national survey study of LGBTQ adolescents from 2017. Exhaustive Chi-square Automatic Interaction Detection analysis was used to identify bias-based bullying experiences (i.e., weight-based, identity-based), self-esteem, LGBTQ pride, and overlapping social positions (i.e., gender identity, sexual identity, race/ethnicity, body mass index (BMI) percentile) associated with the highest prevalence of unhealthy weight control behaviors, extreme unhealthy weight control behaviors, and past year binge eating. RESULTS Adolescents in the 28 identified groups with a high prevalence of disordered eating behavior held at least one structurally marginalized social position (e.g., high BMI), bias-based bullying experience, low self-esteem, or low LGBTQ pride in addition to being LGBTQ. Weight-based bullying was a salient risk-factor for disordered eating across social positions. Among adolescents with the same social positions, levels of self-esteem, LGBTQ pride, but no bias-based bullying experience, prevalence estimates of disordered eating were, on average, 23% lower. DISCUSSION LGBTQ adolescents with multiple marginalized social positions and related factors engage in disproportionately high prevalence disordered eating. Findings underscore the importance of addressing intersecting experiences of stigma to reduce disordered eating and promote health equity among adolescents. PUBLIC SIGNIFICANCE Multiply marginalized LGBTQ adolescents, most of whom also reported experiencing bias-based bullying from peers at school, reported disproportionately high prevalence disordered eating. In comparison groups of adolescents with no bias-based bullying experience, prevalence of disordered eating was, on average, 24% lower. Findings underscore the importance of addressing intersecting experiences of stigma to reduce disordered eating and promote health equity among adolescents.
Collapse
|
3
|
Emotional Distress Disparities Across Multiple Intersecting Social Positions: The Role of Bias-Based Bullying. Pediatrics 2024; 153:e2023061647. [PMID: 38273773 PMCID: PMC10827645 DOI: 10.1542/peds.2023-061647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/26/2023] [Indexed: 01/27/2024] Open
Abstract
OBJECTIVES To apply an intersectional lens to disparities in emotional distress among youth, including multiple social positions and experiences with bias-based bullying. METHODS Data are from the 2019 Minnesota Student Survey (n = 80 456). Social positions (race and ethnicity, sexual orientation, gender) and 2 forms of bias-based bullying (racist, homophobic or transphobic) were entered into decision tree models for depression, anxiety, self-injury, suicidal ideation, and suicide attempts. Groups with the highest prevalence are described. Rates of emotional distress among youth with matching social positions but no bias-based bullying are described for comparison. RESULTS LGBQ identities (90%) and transgender, gender diverse, and questioning identities (54%) were common among the highest-prevalence groups for emotional distress, often concurrently; racial and ethnic identities rarely emerged. Bias-based bullying characterized 82% of the highest-prevalence groups. In comparable groups without bias-based bullying, emotional distress rates were 20% to 60% lower (average 38.8%). CONCLUSIONS Findings highlight bias-based bullying as an important point for the intervention and mitigation of mental health disparities, particularly among lesbian, gay, bisexual, transgender, gender-diverse, queer, and questioning adolescents. Results point to the importance of addressing bias-based bullying in schools and supporting lesbian, gay, bisexual, transgender, gender-diverse, queer, and questioning students at the systemic level as a way of preventing emotional distress.
Collapse
|
4
|
Examining Mental Health and Bullying Concerns at the Intersection of Sexuality, Gender, Race, and Ethnicity Among a National Sample of Sexual and Gender Diverse Youth. LGBT Health 2024; 11:20-27. [PMID: 37668602 DOI: 10.1089/lgbt.2023.0072] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023] Open
Abstract
Purpose: Most extant scholarship that examines the health experiences of sexual and gender diverse youth (SGDY) is limited in the ability to apply an intersectional framework due to small sample sizes and limitations in analytic methods that only analyze the independent contribution of social identities. To address this gap, this study explored the well-being of youth at the intersection of ethnic, racial, sexual, and gender identities in relation to mental health and bullying. Methods: Data were from a U.S. national survey of SGDY aged 13-18 years, collected in 2022 (N = 12,822). Exhaustive Chi-square Automatic Interaction Detection analysis identified intersectional social positions bearing the greatest burden of negative health-related experiences (depression, anxiety, and past 30-day in-person victimization). Results: Transgender boys were among those at the highest prevalence for compromised mental health and peer-based in-person victimization. Although the primary distinguishing factor was transgender identity for depression and anxiety, there were no racial/ethnic distinctions, corroborating some previous scholarship. Asian cisgender and transgender girl SGDY shared the lowest burden of peer-based in-person victimization in school. Conclusion: Our findings suggest a need for scholars, health professionals, and other stakeholders to better understand the mechanisms that drive negative health experiences and in-person victimization experiences at the intersections of sexual, gender, racial, and ethnic identities.
Collapse
|
5
|
Health Consequences of Familial Negative Weight Talk Across the Spectrum of Gender Diversity. Curr Nutr Rep 2023; 12:581-593. [PMID: 37837600 DOI: 10.1007/s13668-023-00501-z] [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] [Accepted: 09/20/2023] [Indexed: 10/16/2023]
Abstract
PURPOSE OF REVIEW To synthesize differences in familial negative weight talk and health-related correlates across gender identities and to highlight gaps relevant to the unique experiences and health correlates of boys and transgender and gender diverse youth. RECENT FINDINGS Most of the studies included in this review observed no difference by gender in familial negative weight talk health correlates. Gender biases in existing measures, however, may have contributed to underreporting of health correlates in boys. Moreover, transgender and gender diverse youth are severely underrepresented in this research. Future research should consistently examine effect modification across gender identities and include measures that are specific to the weight-based concerns and experiences of boys and transgender and gender diverse youth.
Collapse
|
6
|
Exploring Bias-Based Bullying and Intersecting Social Positions as Correlates of Sexual Risk Behaviors Among Adolescents. LGBT Health 2023; 10:608-616. [PMID: 37358630 PMCID: PMC10712366 DOI: 10.1089/lgbt.2022.0301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2023] Open
Abstract
Purpose: The current study extends the limited body of intersectional research on adolescents' sexual health by examining experiences of bias-based bullying and multiple intersecting social positions associated with engagement in sexual risk behaviors. Methods: Participants were 14,968 sexually active 9th and 11th grade students surveyed as part of the 2019 Minnesota Student Survey (15% lesbian/gay/bisexual/queer/pansexual/questioning [LGBQ] and/or transgender/gender diverse [TGD] or gender questioning). Exhaustive Chi-square Automatic Interaction Detection analysis was used to identify experiences (i.e., bias-based bullying victimization) and intersecting social positions (i.e., sexual orientation identity; gender identity/modality; race/ethnicity; physical disabilities/chronic illness; mental health/behavioral/emotional problems) associated with the highest prevalence of three sexual risk behaviors. Results: Overall, 18% of adolescents reported 3+ sex partners in the last year, 14% reported drug/alcohol use before last sex, and 36% reported not discussing protection from sexually transmitted infections with new sexual partners. Adolescents with 2+ marginalized social positions, some of whom also experienced bias-based bullying, were part of 53% of the highest prevalence risk groups. For example, 42% of Multiracial or Latina/x/o gender questioning adolescents who identified as LGBQ reported 3+ sex partners in the last year-twice the sample average. Adolescents who were Black, American Indian/Alaska Native, Latina/x/o, Multiracial, TGD, or gender questioning were in the highest prevalence nodes across all outcomes. Conclusion: Adolescents with multiple marginalized social positions and who experience bias-based bullying engage in high-risk sexual behaviors at higher-than-average rates. Findings underscore the importance of addressing intersecting experiences of stigma to reduce high-risk sex behaviors and promote health equity among adolescents.
Collapse
|
7
|
Bullying Involvement at the Intersection of Gender Identity/Modality, Sexual Identity, Race, Ethnicity, and Disability: Prevalence Disparities and the Role of School-Related Developmental Assets. LGBT Health 2023; 10:S10-S19. [PMID: 37754921 PMCID: PMC10623467 DOI: 10.1089/lgbt.2023.0076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023] Open
Abstract
Purpose: This study examines adolescents' self-reported school-based developmental assets and four intersecting social positions as they relate to prevalence of bullying involvement. Methods: Participants were 80,456 ninth and 11th grade students who participated in the 2019 Minnesota Student Survey (30.2% youth of color; 11% lesbian/gay/bisexual/pansexual/queer/questioning; 2.9% transgender/gender diverse [TGD] or gender questioning). Exhaustive Chi-square Automatic Interaction Detection analysis was used to identify school-based developmental assets (i.e., school safety, school adult support) and intersecting social positions (i.e., sexual identity; gender identity/modality; racial/ethnic identity; physical disabilities/chronic illness; and/or mental health/behavioral/emotional problems) associated with the highest prevalence of involvement as physical and relational bullies, victims, and bully-victims. Results: Adolescents with 2+ marginalized social positions who often lacked school-based developmental assets were part of nearly all the highest prevalence bullying involvement groups. TGD and gender questioning adolescents, Native American youth, and youth living with both physical disabilities/chronic illness and mental health/emotional/behavioral problems-most of whom had additional marginalized social positions and lacked school-based assets-were particularly overrepresented in high prevalence groups. For example, 31.1% of TGD or gender questioning youth of color living with both types of disabilities/health problems who did not feel strongly that school was safe reported involvement as physical bully-victims-nearly six times the sample average rate. Conclusion: Adolescents with multiple marginalized social positions and those lacking certain school-based assets-often overlapping categories-were involved in bullying at higher-than-average rates. Findings underscore the need for schools to address intersecting experiences of stigma and structural oppression that may perpetuate bullying involvement disparities.
Collapse
|
8
|
Family-based weight stigma and psychosocial health: A multinational comparison. Obesity (Silver Spring) 2023; 31:1666-1677. [PMID: 37171908 DOI: 10.1002/oby.23748] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/10/2023] [Accepted: 01/24/2023] [Indexed: 05/14/2023]
Abstract
OBJECTIVE Family-based weight stigma can be expressed as criticism, judgment, teasing, and mistreatment by family members because of an individual's body weight. The current study compared the prevalence and psychosocial correlates of family-based weight stigma among adult members of a weight-management program living in Australia, Canada, France, Germany, the UK, and the US. METHODS Participants (N = 8100 adults who reported having ever experienced weight stigma; 95% female; 94% White) completed an identical online survey in their country's dominant language that assessed their experiences of weight stigma from 16 different family member sources, as well as internalized weight bias, body image, eating behaviors, perceived stress, and self-rated health. RESULTS Family-based weight stigma, especially from mothers (49%-62%), spouses/romantic partners (40%-57%), and fathers (35%-48%), was highly prevalent across countries. Weight stigma from one's immediate family members was associated with indices of poorer psychosocial health across the six countries (β coefficients = |0.08-0.13|). CONCLUSIONS Findings highlight the need for weight stigma-reduction efforts to help family members distinguish between supportive, encouraging discourse and potentially weight-stigmatizing communication. Future research should examine the prevalence and correlates of family-based weight stigma in more diverse community samples, including among racially/ethnically and gender diverse adults, and in non-Western countries.
Collapse
|
9
|
"Look beyond the weight and accept me": Adolescent perspectives on parental weight communication. Body Image 2023; 45:11-19. [PMID: 36731347 DOI: 10.1016/j.bodyim.2023.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 12/09/2022] [Accepted: 01/20/2023] [Indexed: 02/04/2023]
Abstract
Critical weight communication between parents and their adolescent children is prevalent and harmful. However, research on adolescent perspectives about parental weight communication is limited. The present mixed-methods study aimed to address this gap using inductive thematic analysis of 1743 adolescents' (Mage=14.61 years, SDage=2.48) preferences regarding parental weight communication in response to an open-ended prompt, and quantitative analyses to examine age, gender, race/ethnicity, and weight-related differences in subthemes. In their responses, adolescents articulated 1) whether and 2) how parental weight communication should-or should not-occur, and 3) what these conversations should entail. We identified 15 subthemes across these categories-the endorsement of which often varied by adolescents' demographic and anthropometric characteristics. For example, some adolescents (especially cisgender girls and transgender/gender diverse adolescents) preferred that their parents talk about weight less often (n = 184), while others (especially multiracial/ethnic or Hispanic/Latinx adolescents) hoped that, if parents were to discuss weight with them, they do so in a manner that was compassionate and respectful (n = 150). Across most subthemes, adolescents described adverse responses (e.g., feeling insecure, embarrassed, or hurt) when parents discussed their weight in non-preferred ways. Collectively, findings can inform interventions to promote more supportive health-focused communication in families.
Collapse
|
10
|
“It’s like an elephant in the room with my family”: LGBTQ+ College Students’ Identity Expression During the COVID-19 Pandemic. JOURNAL OF ADOLESCENT RESEARCH 2023. [DOI: 10.1177/07435584221149372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The COVID-19 pandemic led many college campuses to close and transition to remote learning. For lesbian, gay, bisexual, transgender, queer, questioning, or otherwise non-heterosexual or cisgender (LGBTQ+) college students, these disruptions may have affected their ability to express their sexual orientation and gender identity (SOGI). We used a developmental assets framework and minority stress theory with open-ended survey responses to examine LGBTQ+ students’ ( N = 411, Mage = 20.5; 38.4% bisexual; 48.7% women) perceptions of whether and how their SOGI expression changed due to the pandemic. We found the majority of LGBTQ+ students described their SOGI expression as restricted. However, some students perceived no change or improvements in their SOGI expression. We also examined whether perceived change in expression differed by gender identity (transgender and gender non-conforming [TGNC] compared to cisgender), and whether students lived with family. TGNC students and students who lived with family were more likely than their peers to report restricted expression and TGNC students were more likely than cisgender students to perceive improvements in their expression. Our findings highlight the internal and external assets that promote positive developmental outcomes for adolescents with minoritized identities and how universities might support LGBTQ+ students.
Collapse
|
11
|
Black Sexual Minority Men's Stigma-Based Experiences Surrounding Pre-exposure Prophylaxis in the Southern United States. LGBT Health 2022; 10:245-251. [PMID: 36516136 PMCID: PMC10079246 DOI: 10.1089/lgbt.2022.0118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Purpose: Intersecting experiences of stigma related to pre-exposure prophylaxis (PrEP) influence PrEP uptake among Black sexual minority men (BSMM) living in the southern United States; however, it is unclear what stigmatized identities and behaviors are impacted when accessing human immunodeficiency virus prevention options. To inform identity-specific PrEP interventions, this study examined stigma in BSMM's lives relating to intersecting experiences of PrEP stigma. Methods: We conducted 32 virtual, semistructured qualitative interviews with BSMM residing in the southeastern United States between February and April 2019. Results: We identified three themes (anticipated stigma, experiences of prejudice and stereotyping, and negative attitudes) and one subtheme within negative attitudes (othering social/sexual groups). Across all themes, PrEP stigma was often manifested through stigma against BSMM's sexual orientation or sexual behavior. BSMM in othering social/sexual groups displayed instances of cognitive dissonance by regularly expressing negative attitudes about and explicitly distancing themselves from social/sexual groups based on sexual orientation and sexual behavior. BSMM's race and gender were rarely mentioned as being stigmatized. Conclusions: Interventions focused on PrEP use could benefit from expanding their definition of PrEP stigma to include a stronger emphasis on intersecting identities and work to reduce cognitive dissonance in BSMM in the form of internalized homophobia.
Collapse
|
12
|
How social support and parent-child relationship quality relate to LGBTQ+ college students' well-being during COVID-19. JOURNAL OF FAMILY PSYCHOLOGY : JFP : JOURNAL OF THE DIVISION OF FAMILY PSYCHOLOGY OF THE AMERICAN PSYCHOLOGICAL ASSOCIATION (DIVISION 43) 2022; 36:653-660. [PMID: 35225639 DOI: 10.1037/fam0000981] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The coronavirus disease (COVID-19) pandemic has negatively impacted the well-being of many college students, particularly lesbian, gay, bisexual, transgender, queer, and questioning (LGBTQ +) students who are already at a disproportionate risk for negative mental health and well-being outcomes. To identify potential risk and protective factors we examined LGBTQ + college students' disclosure of sexual orientation, gender identity, or both (SOGI) to mothers and fathers, living arrangements (whether or not students lived with mothers and fathers), social support from family and friends, and parent-child relationship quality and their association with stress, depressive symptoms, anxiety symptoms, and problem drinking during the pandemic. LGBTQ + college students (N = 366; Mage = 20.4) completed an online survey. Students who reported more social support from family and friends and better quality relationships with mothers or fathers had better well-being and were less likely to perceive a substantial decrease in their well-being due to the pandemic. In contrast, SOGI disclosure and whether or not students lived with mothers or fathers were generally unrelated to well-being. Findings suggest that universities should consider offering mental health resources for students living on- and off-campus, and that clinical professionals should consider strategies to help these young adults identify and maintain support systems and highlight the value of positive parent-child relationships. (PsycInfo Database Record (c) 2022 APA, all rights reserved).
Collapse
|
13
|
‘ Help Us, Help You’: A Needs-Based Assessment of Pediatric Resident Knowledge of Physician Health Resources and Barriers to Access. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.28aa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
14
|
Reference Range for TSH and Free T4 (FT4) in Very Low Birth Weight (VLBW) Infants at 3–5 Weeks of Life. Paediatr Child Health 2012. [DOI: 10.1093/pch/17.suppl_a.38ab] [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
|
15
|
Dynamic equilibria in the products of intramolecular Buchner additions of diazoketones to aryl rings bearing methoxy substituents. J Org Chem 2001; 66:7166-77. [PMID: 11597247 DOI: 10.1021/jo015750l] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rhodium carboxylate catalyzed aromatic addition reactions of a range of diazoketones bearing methoxy-substituted aryl rings have been explored. While the existence of norcaradiene-cycloheptatriene equilibria in related compounds is well established, the aromatic addition products in this study display more complex dynamic equilibria due to conjugation with the methoxy group; the experimental evidence for this is discussed in detail. In the azulenone products 21-26 derived from p-methoxy-substituted diazoketones 14-16, the diastereomers interconvert via a spiro intermediate 39. A related mechanistic process in the azulenones 43-46 derived from the o-methoxy-substituted diazoketones 17, 18 interconverts regioisomers, explaining the conflicting reports for the regioselectivity of the cyclization of diazoketone 1. With the m-methoxy-substituted diazoketone 19, involvement of the methoxy group through a different pathway results in fragmentation of the azulenone to form the tetralone 47. With the azulenones 21-26 exclusive trapping of the norcaradiene associated with the less thermodynamically stable diastereomers in a cycloadduct with N-phenylmaleimide is observed. Due to the presence of the activating methoxy substituent on the aromatic ring, the aromatic addition reactions of the diazoketones studied were not very sensitive to the nature of the rhodium catalyst.
Collapse
|
16
|
4-Ethynyl-1,2-methylenedioxybenzene at 150 K. Acta Crystallogr C 2001; 57:412-3. [PMID: 11313577 DOI: 10.1107/s0108270100019909] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2000] [Accepted: 12/07/2000] [Indexed: 11/10/2022] Open
Abstract
The title compound, C(9)H(6)O(2), contains two moderate C-H.O hydrogen bonds. That involving the terminal alkyne gives rise to chains along the b axis. The other hydrogen bond occurs over a centre of symmetry, leading to dimers. The combination of the two interactions gives rise to rings, each comprising six molecules, which are part of infinite sheets in the bc plane.
Collapse
|
17
|
Abstract
The galactopoietic effect of daily injections, for five day periods, of growth hormone was examined by measuring milk yield, mammary blood flow and arteriovenous differences of glucose and amino acids on 12 occasions in four goats. In 10 periods there were marked increases (mean 18.1%) in mammary blood flow (8 statistically significant) and less-marked increases (mean 8.0%) in milk yield (6 statistically significant). On 8 of the occasions on which it was measured the maximum blood plasma growth hormone concentration was increased to more than 8 ng/ml. There were no statistically significant changes in mammary arteriovenous concentration differences of glucose or amino acids in response to growth hormone injections. It is suggested that, contrary to the usual situation in which the rate of mammary blood flow appears to be regulated by the metabolic activity of the gland, the galactopoietic response to growth hormone may be a consequence of elevated blood flow, which increases the supply to the gland of rate-limiting metabolic substrates.
Collapse
|
18
|
Amino acid uptake by the mammary glands of goats and cows at the time of parturition [proceedings]. J Physiol 1978; 284:72P-73P. [PMID: 731580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
|