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Um pesquisador está realizando uma espectrofotometria para determinar a concentração de uma solução de ácido nucleico. Ele registra uma absorbância de 0,600 em uma cubeta de 1 cm de caminho óptico para a amostra. Sabendo que o coeficiente de extinção molar do ácido nucleico é de 15.000 M-1 cm-1, qual é a concentração da solução?
Durante uma aula prática de laboratório, um estudante está observando uma amostra no microscópio óptico. Ele está utilizando uma objetiva de imersão de 100x e deseja aumentar ainda mais a resolução da imagem. Qual é a função do óleo de imersão neste cenário e por que é necessário usá-lo?
I. Começar a observação com a menor objetiva (colocar na de 10x para observação de bactérias). II. Colocar a lâmina com a preparação de baixo da platina e prendê−la com as pinças metálicas. III. Colocar na objetiva de menor aumento e baixar a platina completamente.
Está CORRETO o que se afirma:
USP•
Scientists have found that generally the world feels brighter when you wake up.
People start the day in the best frame of mind in the morning, but end in the worst, at about midnight, the findings suggest, with the day of the week and the season also playing a part.
Mental health also tends to be more varied at weekends but steadier during the week, according to the study led by University College London.
“Generally, things do seem better in the morning,” the researchers concluded.
Mental health and wellbeing are dynamic in nature, and subject to change over short and long periods. However, few studies have looked at how they might change over the course of the day.
Scientists wanted to explore whether time of day was associated with variations in mental health, happiness, life satisfaction, sense of life being worthwhile and loneliness.
People in the study answered questionnaires, with questions such as: “In the past week, how happy did you feel?”, “How satisfied have you been with your life?”, and “To what extent have you felt the things you are doing in your life are worthwhile?”
Factors such as age, health conditions and whether people worked were taken into account.
The results showed that happiness, life satisfaction, and worthwhile ratings were all higher on Mondays and Fridays than on Sundays, while happiness was also higher on Tuesdays. There was no evidence that loneliness differed across days of the week.
There was clear evidence of a seasonal influence on mood. Compared with winter, people tended to have lower levels of depressive and anxiety symptoms and loneliness, and higher levels of happiness, and feeling that life was worthwhile in the three other seasons.
Mental health was best in the summer across all outcomes. But the season didn’t affect the associations observed across the day, however.
This was an observational study, so it cannot establish cause.
The Guardian.com. February 5, 2025. Adaptado.
FGV•
( ) A administração de alguns medicamentos, a ingestão de corantes alimentícios ou de alimentos como beterraba, podem influenciar na cor da urina. ( ) O valor da densidade urinária corresponde à quantidade de urina produzida em 24 horas. ( ) A presença de proteinúria e glicosúria interfere na densidade da urina.
As afirmativas são, respectivamente,
Qual é uma prática adequada ao coletar uma amostra de sangue para análises laboratoriais?
FGV•
A respeito de microscopia, analise as afirmativas a seguir.
I. Uma amostra observada em um microscópio equipado com oculares de 10x, utilizando uma objetiva com indicação de aumento de 40x, tem seu tamanho ampliado em quarenta vezes. II. Ao analisar uma amostra, deve-se sempre iniciar o uso do microscópio focalizando pela objetiva de menor aumento. III. A função do micrométrico é movimentar a platina no eixo X Y (anteroposterior e lateral), permitindo a observação de todos os campos da amostra.
Está correto o que se afirma em
I. Glicemia. II. Trigliceridemia. III. Sorologia para HIV I/II. IV. Hemoglobina glicosilada (HbA1c).
Caso o paciente não seja devidamente informado darecomendação de abstinência de álcool em um período de, ao menos, 72h que antecedem a coleta, quais são os marcadores que podem sofrer a influência direta dessa falha de comunicação e do consumo recreativo dessa substância previamente à coleta?
Scientists have found that generally the world feels brighter when you wake up.
People start the day in the best frame of mind in the morning, but end in the worst, at about midnight, the findings suggest, with the day of the week and the season also playing a part.
Mental health also tends to be more varied at weekends but steadier during the week, according to the study led by University College London.
“Generally, things do seem better in the morning,” the researchers concluded.
Mental health and wellbeing are dynamic in nature, and subject to change over short and long periods. However, few studies have looked at how they might change over the course of the day.
Scientists wanted to explore whether time of day was associated with variations in mental health, happiness, life satisfaction, sense of life being worthwhile and loneliness.
People in the study answered questionnaires, with questions such as: “In the past week, how happy did you feel?”, “How satisfied have you been with your life?”, and “To what extent have you felt the things you are doing in your life are worthwhile?”
Factors such as age, health conditions and whether people worked were taken into account.
The results showed that happiness, life satisfaction, and worthwhile ratings were all higher on Mondays and Fridays than on Sundays, while happiness was also higher on Tuesdays. There was no evidence that loneliness differed across days of the week.
There was clear evidence of a seasonal influence on mood. Compared with winter, people tended to have lower levels of depressive and anxiety symptoms and loneliness, and higher levels of happiness, and feeling that life was worthwhile in the three other seasons.
Mental health was best in the summer across all outcomes. But the season didn’t affect the associations observed across the day, however.
This was an observational study, so it cannot establish cause.
The Guardian.com. February 5, 2025. Adaptado.
FGV•
Considere as massas: C = 12 u; H = 1 u; O = 16 u.
FGV•
Em relação ao método de Coombs direto, analise as afirmativas a seguir.
I. Este método identifica a presença de anticorpos na superfície das hemácias.
II. O teste é realizado por meio da adição de antiglobulinas em uma amostra de plasma do paciente, e, sua interpretação, é feita pela aglutinação ou não das hemácias com antígenos conhecidos.
III. A antiglobulina humana poliespecífica reagem contra IGg humano (anti IgG) e componentes do complemento (antiC3d)
Está correto o que se afirma em