In the case of a gas-discharge lamp, the differential resistance ( i . e ., dV / dI ) really becomes negative because the positive variation for the current ( dI ) causes a negative variation for the voltage ( dV ) across the lamp.
2.
The American Psychiatric Association " affirms that same-sex sexual and romantic attractions, feelings, and behaviors are normal and positive variations of human sexuality regardless of sexual orientation identity; reaffirms its position that homosexuality per se is not a mental disorder and opposes portrayals of sexual minority youths and adults as mentally ill due to their sexual orientation; concludes that there is insufficient evidence to support the use of psychological interventions to change sexual orientation; encourages mental health professionals to avoid misrepresenting the efficacy of sexual orientation change efforts by promoting or promising change in sexual orientation when providing assistance to individuals distressed by their own or others sexual orientation; concludes that the benefits reported by participants in sexual orientation change efforts can be gained through approaches that do not attempt to change sexual orientation; concludes that the emerging knowledge on affirmative multiculturally competent treatment provides a foundation for an appropriate evidence-based practice with children, adolescents and adults who are distressed by or seek to change their sexual orientation; advises parents, guardians, young people, and their families to avoid sexual orientation change efforts that portray homosexuality as a mental illness or developmental disorder and to seek psychotherapy, social support and educational services that provide accurate information on sexual orientation and sexuality, increase family and school support, and reduce rejection of sexual minority youth; encourages practitioners to consider the ethical concerns outlined in the 1997 APA Resolution on Appropriate Therapeutic Response to Sexual Orientation, in particular the following standards and principles : scientific bases for professional judgments, benefit and harm, justice, and respect for people s rights and dignity; encourages practitioners to be aware that age, gender, gender identity, race, ethnicity, culture, national origin, religion, disability, language, and socioeconomic status may interact with sexual stigma, and contribute to variations in sexual orientation identity development, expression, and experience; opposes the distortion and selective use of scientific data about homosexuality by individuals and organizations seeking to influence public policy and public opinion and will take a leadership role in responding to such distortions; supports the dissemination of accurate scientific and professional information about sexual orientation in order to counteract bias that is based in lack of knowledge about sexual orientation; and encourages advocacy groups, elected officials, mental health professionals, policy makers, religious professionals and organizations, and other organizations to seek areas of collaboration that may promote the wellbeing of sexual minorities ."
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